CN103143441B - A kind of charged coalescence body driving into control method and system in coalescence electric field - Google Patents

Abstract

The application provides a kind of charged coalescence body driving into control method in coalescence electric field, comprising: the charged coalescence body in coalescence electric field is taken, obtained the image of described charged coalescence body; Described image is processed, obtained the state variation situation of described charged coalescence body in coalescence electric field; Obtain the state variation situation of described charged coalescence body in coalescence electric field, calculate the migration velocity of described charged coalescence body according to described state variation situation; According to the migration velocity of described charged coalescence body, driving into the trend of motion of this charged coalescence body analyzed, do not meet defaultly when regular when analysis obtains described trend, regulate described coalescence electric field that the migration velocity of described charged coalescence body is changed. By according to charged coalescence body, the migration velocity in coalescence electric field regulates, control driving into the trend of motion, make charged coalescence body can enter fast and accurately deduster deflector air-flow compartment system, improve efficiency of dust collection.

Description

A kind of charged coalescence body driving into control method and system in coalescence electric field

Technical field

The application belongs to Environmental-protecting dust-removing field, relates in particular to a kind of charged coalescence body driving into controlling party in coalescence electric fieldMethod and system.

Background technology

In industrial processes, produce a large amount of human bodies and can suck (dust size is less than 10 microns) health is producedGreatly the dust of harm, has formed threat to human life's health problem.

PM in the dust that can suck (ParticulateMatter, the solid in atmosphere or liquid particles shape material) 2.5Be to enter lung particle, its particle diameter is little, but be rich in a large amount of poisonous and harmful substances and time of stopping in atmosphere long, defeatedSend distance, therefore larger to the harm of health. Therefore lung particle PM2.5 is all being gone into overdrive to be devoted to enter in the whole worldDischarge standard.

Current, be generally to adopt the mode that tiny dust coalescence is increased to the collection of PM2.5, then by the dust increasingParticle is collected by electrostatic precipitator, and the process of this collection is, the coalescence body that dust coalescence obtains with certain drive intoSpeed motion, arrives deduster deflector air-flow compartment system through flue, completes dust removal process.

In prior art, often ignore this charged coalescence body and move to the motion process before deduster, still, this motion tableLevy the situation that charged coalescence body moves in the coalescence electric field of coalescence region, when some coalescence bodies move in coalescence electric field, byAffect and directly arrive on the inwall or flue of coalescence device in the direction of motion or stressing conditions, cannot arrive dust-precipitator deflectorAir-flow compartment system, exerts an influence for efficiency of dust collection.

Summary of the invention

In view of this, the application's object is to provide a kind of charged coalescence body driving into control method in coalescence electric fieldAnd system, to coalescence body, driving into motion in coalescence electric field controlled, and then improves efficiency of dust collection.

Charged coalescence body driving into a control method in coalescence electric field, comprising:

Charged coalescence body in coalescence electric field is taken, obtained the image of described charged coalescence body;

Described image is processed, obtained the state variation situation of described charged coalescence body in coalescence electric field;

Obtain the state variation situation of described charged coalescence body in coalescence electric field, calculate according to described state variation situationObtain the migration velocity of described charged coalescence body;

According to the migration velocity of described charged coalescence body, driving into the trend of motion of this charged coalescence body analyzed,Do not meet defaultly when regular when analysis obtains described trend, regulate described coalescence electric field to make driving into speed of described charged coalescence bodyDegree changes.

Above-mentioned method, preferred, the state variation situation of described charged coalescence body in coalescence electric field comprises coalescence bodyMotion path and metamorphosis.

Above-mentioned method, preferred, described image is processed, obtain described charged coalescence body in coalescence electric fieldState variation situation comprises:

Each the image obtaining carried out to sequential arrangement;

The form of charged coalescence body in each image copied in the same coordinate system system successively, will indicate each positionForm point is connected, and obtains the state variation situation of described charged coalescence body in coalescence electric field.

Above-mentioned method, preferred, the described state variation situation of described foundation calculates driving of described charged coalescence bodyEntering speed comprises:

Motion path according to described charged coalescence body in coalescence electric field obtains the carrying capacity of described charged coalescence body;

According to carrying capacity and the form of described charged coalescence body, calculate the packing of described coalescence body;

Calculate the migration velocity of described charged coalescence body in coalescence electric field according to described packing.

Above-mentioned method, preferred, the migration velocity of the described charged coalescence body of described foundation, to driving of this charged coalescence bodyThe trend analysis of entering motion comprises:

According to carrying capacity and the form of described charged coalescence body, calculate the stressing conditions of described coalescence body;

Obtain driving into direction and driving into speed of described charged coalescence body according to the migration velocity of described charged coalescence body;

According to driving into speed and stressing conditions of described charged coalescence body, calculate and drive in direction described, described lotusThe distance that coagulation body can move.

Above-mentioned method, preferred, regulate described coalescence electric field to comprise: the intensity size and the frequency that regulate described coalescence electric fieldRate.

Charged coalescence body driving into a control system in coalescence electric field, comprising:

Picture pick-up device, takes for the charged coalescence body to coalescence electric field, obtains the figure of described charged coalescence bodyPicture;

Path maker, for described image is processed, obtains the shape of described charged coalescence body in coalescence electric fieldState situation of change;

Calculator, for obtaining the state variation situation of described charged coalescence body at coalescence electric field, according to described stateSituation of change calculates the migration velocity of described charged coalescence body;

Electric field adjusting device, for the migration velocity according to described charged coalescence body, to driving into motion of this charged coalescence bodyTrend analyze, do not meet defaultly when regular when analysis obtains described trend, regulate described coalescence electric field to make described lotusThe migration velocity of coagulation body changes.

The application provides a kind of charged coalescence body driving into control method in coalescence electric field, comprising: to coalescence electric fieldIn charged coalescence body take, obtain the image of described charged coalescence body; Described image is processed, obtained described lotusCoagulation the body state variation situation in coalescence electric field; Obtain the state variation feelings of described charged coalescence body in coalescence electric fieldCondition, the described state variation situation of foundation calculates the migration velocity of described charged coalescence body; The described charged coalescence body of foundationMigration velocity, analyzes driving into the trend of motion of this charged coalescence body, does not meet default when analysis obtains described trendRegular time, regulate described coalescence electric field make described charged coalescence body migration velocity change. By according to charged coalescence bodyMigration velocity in coalescence electric field regulates, and controls driving into the trend of motion, makes the charged coalescence body can be fastSpeed arrives deduster deflector air-flow compartment system accurately, improves efficiency of dust collection.

Brief description of the drawings

In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existingHave the accompanying drawing of required use in technical description to be briefly described, apparently, the accompanying drawing in the following describes is the applicationSome embodiment, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also basisThese accompanying drawings obtain other accompanying drawing.

Fig. 1 is a kind of charged coalescence body the driving into the stream of control method embodiment 1 in coalescence electric field that the application providesCheng Tu;

Fig. 2 is that a kind of charged coalescence body the driving in control method embodiment 1 in coalescence electric field that the application provides coagulatedAnd the motion path schematic diagram of body in coalescence electric field;

Fig. 3 is a kind of charged coalescence body the driving in control method embodiment 1 in coalescence electric field that the application providesThe particular flow sheet of step S103;

Fig. 4 is a kind of charged coalescence body the driving in control method embodiment 1 in coalescence electric field that the application providesThe particular flow sheet of step S104;

Fig. 5 is that a kind of charged coalescence body the driving in control method embodiment 2 in coalescence electric field that the application provides walksThe particular flow sheet of rapid S102;

Fig. 6 is a kind of charged coalescence body the driving into the knot of control system embodiment 1 in coalescence electric field that the application providesStructure schematic diagram;

Fig. 7 is a kind of charged coalescence body the driving into the enforcement of control method and system in coalescence electric field that the application providesThe application scenarios of example in reality is implemented.

Detailed description of the invention

For making object, technical scheme and the advantage of the embodiment of the present application clearer, below in conjunction with the embodiment of the present applicationIn accompanying drawing, to the technical scheme in the embodiment of the present application carry out clear, intactly describe, obviously, described embodiment isSome embodiments of the present application, instead of whole embodiment. Based on the embodiment in the application, those of ordinary skill in the artDo not make the every other embodiment obtaining under creative work prerequisite, all belonging to the scope of the application's protection.

Along with the coalescence of Charged, the coalescence body that reaches volume requirement in the coalescence electric field of alternation increases gradually, whenWhen the content that meets the coalescence body of volume requirement reaches predetermined dedusting and requires, start this coalescence body to be carried out to dedusting, this dedustingProcess can realize in deduster.

A kind of charged coalescence body the driving into control method in coalescence electric field that shows the application and provide referring to Fig. 1 implementedThe flow chart of example 1, the method comprises:

Step S101: the charged coalescence body in coalescence electric field is taken, obtained the image of described charged coalescence body;

Because particle is to scattering of light principle, the charged coalescence body in coalescence electric field is taken to the image of this shootingEmbody the resemblance that this charged coalescence body is taken face.

For obtaining the outline drawing picture than more comprehensive charged coalescence body, can adopt multi-angled shooting, as former and later two angles,Because the motion change of charged coalescence body is very fast, need to adopt simultaneously and take.

Step S102: described image is processed, obtained the state variation of described charged coalescence body in coalescence electric fieldSituation;

The state variation situation of described charged coalescence body in coalescence electric field comprises that the motion path of coalescence body and form becomeChange.

Can calculate the parameter such as volume or area of this coalescence body according to the resemblance of this charged coalescence body. By thisThe variation of volume or area, can carry out analytical calculation by the metamorphosis in coalescence electric field to coalescence body.

Fig. 2 shows the motion path schematic diagram of coalescence body in coalescence electric field. Due in certain moment, electric field can be lookedFor constant, be the electric field that dc source provides, the motion conditions to coalescence body in electric field is analyzed.

Wherein U is power supply, and coalescence body institute is electrically charged is negative electrical charge, and pole plate is coalescence edges of regions (inwall of coalescer),A, B, C, D, E, F, G point are respectively the point in the motion path of coalescence body in coalescence electric field, and A point is starting point, and G point is for arrivingPoint in coalescence edges of regions time.

$E=\frac{A}{\sqrt{2\mathrm{\π}\mathrm{\σ}}}\sqrt{\frac{r_0^2{E}_0^2}{x^2}+\frac{1}{2{\mathrm{\π\ϵ}}_{0}k}(1-\frac{r_0^2}{x^2})\exp (-\frac{y^2}{2{\mathrm{\σ}}^2})}---\left(1\right)$

PM2.5 dust coalescence body carrying capacity calculates:

$\frac{{\mathrm{dq}}_P}{d_t}=B_{n}n+B_{l}I-{\mathrm{Aq}}_P+C---\left(2\right)$

Wherein, q_PFor coalescence body carrying capacity; B_nFor electron attachment coefficient; B_lFor pole plate attachment coefficient; A is that pole plate wall is chargedCoefficient.

Coalescence current field condition is learned the impact of characteristic parameter on coalescence volume morphing: electrically charged particle (dust granules) is at turbulent fluctuation electric currentCoalescence in body is a very complicated problem, and it not only depends on the electrochemical properties of particle surface and the thing of medium fluidPhysicochemical character, also relates to the physical mechanics effect between electrofluid and dust granules, because the motion of coalescence electric field causes solidifyingAnd the coalescence in the same way of particle collision in electric field, be in production reality coalescence body particle drive into Main Function, coalescence speed in the same waySize for the very strong directive function that is designed with of PM2.5 particle aggregation device, due to the later stage in coalescence process, coalescence bodyFractal characteristic has the meaning of particular importance to effective " catching range " of fractal coagulation body, can than theoretic spherical radiusThe better sphere of action between reflection particle, effective seizure radius of fractal coagulation body depends primarily on the FRACTAL DIMENSION of coalescence bodyThe size of number, in coalescence dynamics in the same way, collision rate function β (i, j) is expressed from the next with the relation of shear rate G:

$\mathrm{\β}(i,j)=\frac{4{\mathrm{Gr}}^3}{3}{(i^{l/d_f}+j^{l/d_f})}^3---\left(3\right)$

In formula, G value is the important parameter that represents Coulomb force flow behavior in reactor, directly affects between particle, coalescenceCollision rate and impact strength between body, between particle and coalescence body, determine the compaction rate of coalescence body.

There is double influence to dust granules coalescence process in the turbulent fluctuation current characteristics in coalescence electric field: can increase particleCollision probability, promotes coalescence; Simultaneously due to the fragmentation of PM2.5 dust granules coalescence body is suppressed to growing up of coalescence body.Overgenerous electric current turbulent fluctuation, although increased particle collision probability, is more the increasing that destroys coalescence body in macroscopic viewTo the inhibitory action of having grown up of coalescence body, in production practices, be to wish that the coalescence body producing is easy to drive in coalescence electric field greatly,Enter, the packing that this coalescence body needs is better, is easy to collect in deduster, and the fractal dimension of coalescence body is large, particle sizeSuitable, shear turbulent Turbulent characteristics and can cause destruction or the recombinant of coalescence body, produce more closely knit structure. TooStrong turbulent fluctuation, although make the packing of coalescence body good, excessive shearing force makes coalescence body be broken into very little particle, difficultyWith in official hour, drive into; Too small turbulence intensity cannot make dust granules collision coalescence.

Step S103: obtain the state variation situation of described charged coalescence body in coalescence electric field, become according to described stateChange situation calculates the migration velocity of described charged coalescence body;

State variation situation according to charged coalescence body in coalescence electric field, can learn the turbulent fluctuation electricity in coalescence electric fieldThe effect of stream to this coalescence body, can obtain the migration velocity of charged coalescence body in coalescence electric field.

The migration velocity of PM2.5 coalescence body can be derived by the stress balance in electrofluid by solid sphere particle,The power that particle is subject in coalescence electric field mainly contains gravity F_g, Coulomb force F_bWith resistance F_d, and have following relation:

F_g-F_b＝F_d

(4)

If the volume of fruit granule is V_e', the density of primary particles, coalescence body and electrofluid is respectively ρ₀, ρ and ρ_w, basicThe volume of grain thing (as dust) is v, between them, has following relation:

$V_e^{\′}(\mathrm{\ρ}-{\mathrm{\ρ}}_w)g=\frac{1}{2}{\mathrm{A\ρ}}_w{C}_D{\mathrm{\μ}}^2---\left(5\right)$

ρ-ρ_w＝(1-ε)(ρ₀-ρ_w)

(6)

In formula, A represents granule surface area (cm²)；

C_DRepresent resistance coefficient, available following various expression respectively:

$A={\mathrm{\α}}_2{L}_0^{2-{\mathrm{df}}_2}{L}^{{\mathrm{df}}_2}---\left(7\right)$

C_D＝aRe^-b

(8)

$\mathrm{Re}=\frac{uL}{v}---\left(9\right)$

The migration velocity of PM2.5 coalescence body can be expressed as:

$u={\[\frac{2{\mathrm{g\α}}_0}{{\mathrm{a\ρ}}_w{\mathrm{\α}}_2}\left(\mathrm{\ρ}-{\mathrm{\ρ}}_w\right){\mathrm{\ψ}}^{{\mathrm{df}}_3/3}{L}_0^{1-{\mathrm{df}}_3+{\mathrm{df}}_2}{v}^{-b}{L}^{{\mathrm{df}}_3+b-{\mathrm{df}}_2}\]}^{1/(2-b)}---\left(10\right)$

With the pass of the characteristic length of coalescence body particle be:

In the time of the fractal dimension of research coalescence body, the calculating of two-dimensional fractal dimension generally with the area of plane to characteristic lengthRelation is obtained, and the two-dimensional fractal dimension of analyzing coalescence body is always less than or equal to 2, works as df₃≤ 2 o'clock, df₂＝df₃, formula (5) can abbreviationFor:

$u={(\frac{2{\mathrm{g\α}}_0}{a_{2}a\mathrm{\ρ}}\left({\mathrm{\ρ}}_f-\mathrm{\ρ}\right){\mathrm{\ψ}}^{{\mathrm{df}}_3/3}{L}_0{L}^b{v}^{-b}\]}^{1/(2-b)}---\left(12\right)$

Now, drive into speed with the reducing and increase of fractal dimension, reason is: fractal dimension is less, represents coalescence bodyPacking less, porosity is higher, electric current can be by the aperture in coalescence body, and the head-on electric current resistance of coalescence body is subtractedLittle, increase thereby make to drive into speed.

Work as df₃When > 2, df₂=2, formula (5) can abbreviation be:

$u={\left(\frac{2{\mathrm{\α}}_{0}g}{a_2\mathrm{\ρ}a}\right({\mathrm{\ρ}}_f-\mathrm{\ρ}\left){\mathrm{\ψ}}^{df/3}{L}_0^{3-df}{L}^{b-2+df}{v}^{-b}\right)}^{1/(2-b)}---\left(13\right)$

Coalescence body drive the double influence that is subject to coalescence body packing and fluoran stream surface electric current resistance into speed, ordinary circumstanceUnder, work as df₃Hour, there are many endoporus coalescence body inside, and the fluoran stream surface of coalescence body in sinking process reduces, and coalescence body sinksTime resistance less, this effect can improve coalescence body migration velocity, but now the packing of coalescence body is very little, coalescence bodyGravity is very little, can make again migration velocity decline, and the two comprehensive function determines the actual migration velocity of coalescence body, packing be withThe three-dimensional fractal dimension of coalescence body is correlated with, and fluoran stream surface is long-pending only relevant with the two-dimensional fractal dimension of coalescence body, because three-dimensional is dividedShape dimension is always greater than the two-dimensional fractal dimension of same coalescence body, so packing is greater than fluoran stream surface to the impact of migration velocityLong-pending impact, at df₃≤ 2 o'clock, the packing of coalescence body was very low, because the decline migration velocity decline effect that causes of packing is largeThe migration velocity long-pending in fluoran stream surface increases effect, and therefore, along with the increase of coalescence body fractal dimension, migration velocity declines gradually,At df₃After > 2, packing increases effect to migration velocity and is greater than the long-pending minimizing effect to migration velocity of fluoran stream surface, migration velocityIncrease with fractal dimension increases.

In this application, the driving into dividing charged coalescence body mainly for the relation between packing and migration velocityAnalyse.

A kind of charged coalescence body the driving into control method in coalescence electric field that shows the application and provide referring to Fig. 3 implementedThe particular flow sheet of the middle step S103 of example 1, step S103 specifically comprises:

Step S1031: the motion path according to described charged coalescence body in coalescence electric field obtains described charged coalescence bodyCarrying capacity;

By Fig. 2 and Shi (2), calculate the carrying capacity of this charged coalescence body.

Step S1032: according to carrying capacity and the morphological feature of described charged coalescence body, calculate the closely knit of described coalescence bodyDegree;

Form by described charged coalescence body in figure, the parcel volume of known this charged coalescence body. For fractalSystem, the parcel volume of PM2.5 coalescence body can be expressed as:

V_e＝αL³

(14)

Under fractal system, the density of PM2.5 particle coalescence body is inquired into:

If the characteristic length L of the primary particles of composition coalescence body₀, form factor is a₀, density is ρ₀, primary particlesQuality is:

m₀＝ρ₀α₀L₀ ³

(15)

If the form factor of PM2.5 particle coalescence body is α, coefficient of concentration is β, and characteristic length is L, for fractal system(but not three-dimensional euclidean system), PM2.5 particle coalescence body contains primary particles and counts N and can be expressed as:

$N={(\mathrm{\β}\mathrm{\α}/{\mathrm{\α}}_0)}^{D_f/3}{(L/L_0)}^{D_f}={\mathrm{\ψ}}^{D_f/3}{(L/L_0)}^{D_f}---\left(16\right)$

In formula, make ψ=β α/α₀，

The quality of PM2.5 coalescence body is:

$m={\mathrm{Nm}}_0={\mathrm{\ρ\α\ψ}}^{D_f/3}{L_0}^{3-D}{L}^{D_f}---\left(17\right)$

The quality of all PM2.5 coalescence bodies in the density unit of the being defined as parcel volume of PM2.5 coalescence body,

ρ＝m/V_e

(18)

From (14) (17), (18), under fractal system, the density of PM2.5 coalescence body is

$\mathrm{\ρ}={\mathrm{\ρ}}_0({\mathrm{\α}}_0/\mathrm{\α}){\mathrm{\ψ}}^{D_f/3}{(L_0/L)}^{3-D_f}---\left(19\right)$

And the standard density of coalescence body can be preset according to the constituent of PM2.5 dust, according to this standard density andThe density of coalescence body can calculate the packing of this coalescence body.

Step S1033: calculate the migration velocity of described charged coalescence body in coalescence electric field according to described packing.

Because the packing of coalescence body is relevant to its migration velocity in coalescence electric field, can count according to this packingCalculation obtains the migration velocity of this charged coalescence body in coalescence electric field.

Step S104: according to the migration velocity of described charged coalescence body, to the trend into motion of driving of this charged coalescence bodyAnalyze;

A kind of charged coalescence body the driving into control method in coalescence electric field that shows the application and provide referring to Fig. 4 implementedThe particular flow sheet of the middle step S104 of example 1, step S104 specifically comprises:

Step S1041: according to carrying capacity and the form of described charged coalescence body, calculate the stressing conditions of described coalescence body;

The parameter of coalescence electric field can be learnt in advance, according to the shape of the carrying capacity obtaining in step S1031 and this coalescence bodyState (comprising: every morphological parameters, as the characteristic length L of coalescence body, form factor a, density p etc.) and coalescence electric field is everyParameter, just can calculate the stressing conditions of this coalescence body in coalescence electric field.

Step S1042: according to the migration velocity of described charged coalescence body obtain driving into direction of described charged coalescence body andDrive into speed;

The migration velocity of this coalescence body comprises: drive into direction and drive into speed.

Step S1043: according to driving into speed and stressing conditions of described charged coalescence body, calculate and drive into direction describedUpper, the distance that described charged coalescence body can move.

According to the stressing conditions of charged coalescence body, the size and Orientation of the acceleration of known this coalescence body.

From Acceleration Formula, this coalescence body, under this stressing conditions, is driving into the move distance in direction, in instituteState and drive in direction, the distance that described charged coalescence body can move, i.e. this charged coalescence body motion in coalescence electric field becomesGesture.

In the embodiment of the present application, be can move distance and this is solidifying by coalescence body to the movement tendency of charged coalescence bodyAnd body is current and coalescer inwall between distance compare, judge whether to meet and drive into rule, but be not limited to this, realityIn enforcement, also can adopt other manner of comparison.

Step S105: do not meet defaultly when regular when analysis obtains described trend, regulate described in described coalescence electric field makesThe migration velocity of charged coalescence body changes.

Default rule is that charged coalescence body can not arrive coalescer inwall.

When the movement tendency of this charged coalescence body in coalescence electric field is that can not arrive coalescer inwall time, it is right not needThe movement tendency of this charged coalescence body is adjusted;

When the movement tendency of this charged coalescence body in coalescence electric field is, can arrive coalescer inwall time, this coalescence to be describedBody can not arrive deduster deflector air-flow compartment system, need adjust the movement tendency of coalescence body, and this motion becomesGesture is the impact that is subject to the migration velocity of coalescence body, can realize by the migration velocity that regulates this coalescence body, and this coalescence bodyMigration velocity is the impact that is subject to packing, and this packing is relevant to fractal dimension, and the fractal dimension of this coalescence body is subject to coalescenceThe impact of electric field. Therefore, regulate the intensity size of described coalescence electric field can reach the migration velocity that makes described charged coalescence bodyThe object changing.

In the present embodiment, the mode that regulates coalescence electric field is the intensity size that regulates described coalescence electric field, but does not limitIn this, in actual enforcement, also can adopt the frequency that regulates coalescence electric field.

Embodiment 2

A kind of charged coalescence body the driving into control method in coalescence electric field that shows the application and provide referring to Fig. 1 implementedThe flow chart of example 1 has been described in detail step S102 in the present embodiment 2.

A kind of charged coalescence body the driving into control method in coalescence electric field that shows the application and provide referring to Fig. 5 implementedThe particular flow sheet of step S102 in example 2, described step S102 comprises:

Step S1021: the each image obtaining is carried out to sequential arrangement;

Because particle is to scattering of light principle, the charged coalescence body in coalescence electric field is taken to the image of this shootingEmbody the profile that this charged coalescence body is taken face. Can calculate the volume of this coalescence body according to the profile of this charged coalescence bodyOr the parameter such as area. By the variation of this volume or area, can divide by the metamorphosis in coalescence electric field coalescence bodyAnalyse calculating.

According to the sequencing of shooting time, the image that has this charged coalescence body to take facial contour to each embodiment is arrangedOrder, each image can embody the state of the charged coalescence body of this shooting time point.

This state comprises: profile state and the state in coalescence electric field.

Step S1022: the form of charged coalescence body in each image is copied in the same coordinate system system successively, will indicateThe form point of each position is connected, and obtains the state variation situation of described charged coalescence body in coalescence electric field.

Charged coalescence body present position difference in each image, profile is also not quite similar, by what represent in each imageThe form of charged coalescence body copies in same coordinate system successively, and what obtain is the coalescence body that indicates each corresponding positionForm, is connected the point of each marker location, obtains the motion conditions of this coalescence body in coalescence electric field, the change of each form pointChange the metamorphosis that has represented coalescence body in coalescence electric field.

For obtaining the outline drawing picture than more comprehensive charged coalescence body, can adopt multi-angled shooting, as former and later two angles,Because the motion change of charged coalescence body is very fast, need to adopt simultaneously and take, while carrying out copying image to arrive same coordinate, canAdopt three-dimensional coordinate, the motion conditions of the charged coalescence body in coalescence electric field is carried out to three-dimensional artificial.

In actual enforcement, can also according to above-mentioned image to charged coalescence body the motion in coalescence electric field to carry out animation imitativeVery, make to drive into process more directly perceived.

A kind of charged coalescence body providing with above-mentioned the application driving into control method embodiment in coalescence electric field is relativeAnswer, the application also provides a kind of charged coalescence body driving into control system embodiment in coalescence electric field.

A kind of charged coalescence body the driving into control system in coalescence electric field that shows the application and provide referring to Fig. 6 implementedThe structural representation of example 1, described system comprises: picture pick-up device 101, path maker 102, calculator 103 and electric field adjusting device104；

Wherein, described picture pick-up device 101 is taken for the charged coalescence body to coalescence electric field, obtains described chargedThe image of coalescence body;

Because particle is to scattering of light principle, picture pick-up device 101 is taken the charged coalescence body in coalescence electric field, shouldThe image of taking has embodied the profile that this charged coalescence body is taken face.

For obtaining the outline drawing picture than more comprehensive charged coalescence body, can adopt multi-angled shooting, as former and later two angles,Because the motion change of charged coalescence body is very fast, need to adopt simultaneously and take.

In actual enforcement, picture pick-up device can adopt high speed high sensitivity camera etc.

Wherein, described path maker 102, for described image is processed, obtains described charged coalescence body at coalescenceState variation situation in electric field;

The state variation situation of described charged coalescence body in coalescence electric field comprises that the motion path of coalescence body and form becomeChange.

Fig. 2 shows the motion path schematic diagram of coalescence body in coalescence electric field. Due in certain moment, electric field can be lookedFor constant, be the electric field that dc source provides, the motion conditions to coalescence body in electric field is analyzed.

Wherein charged coalescence body institute is electrically charged is negative electrical charge, and U is power supply, and pole plate is that coalescence edges of regions (can be considered coalescenceThe inwall of device), A, B, C, D, E, F, G point are respectively the point in the motion path of coalescence body in coalescence electric field, and A point is initialPoint, G point is the point while arriving coalescence edges of regions.

$E=\frac{A}{\sqrt{2\mathrm{\π}\mathrm{\σ}}}\sqrt{\frac{r_0^2{E}_0^2}{x^2}+\frac{1}{2{\mathrm{\π\ϵ}}_{0}k}(1-\frac{r_0^2}{x^2})\exp (-\frac{y^2}{2{\mathrm{\σ}}^2})}---\left(1\right)$

PM2.5 dust coalescence body carrying capacity calculates:

$\frac{{\mathrm{dq}}_P}{d_t}=B_{n}n+B_{l}I-{\mathrm{Aq}}_P+C---\left(2\right)$

Wherein, q_PFor coalescence body carrying capacity; B_nFor electron attachment coefficient; B_lFor pole plate attachment coefficient; A is that pole plate wall is chargedCoefficient.

Coalescence current field condition is learned the impact of characteristic parameter on coalescence volume morphing: electrically charged particle (dust granules) is at turbulent fluctuation electric currentCoalescence in body is a very complicated problem, and it not only depends on the electrochemical properties of particle surface and the thing of medium fluidPhysicochemical character, also relates to the physical mechanics effect between electrofluid and dust granules, because the motion of coalescence electric field causes solidifyingAnd the coalescence in the same way of particle collision in electric field, be in production reality coalescence body particle drive into Main Function, coalescence hastens in the same wayThe size of rate is for the very strong directive function that is designed with of PM2.5 particle aggregation device, due to the later stage in coalescence process, and coalescence bodyFractal characteristic effective " catching range " of fractal coagulation body there is to the meaning of particular importance, than theoretic spherical radius energySphere of action between enough better reflection particles, effective seizure radius of fractal coagulation body depends primarily on the fractal of coalescence bodyThe size of dimension, in coalescence dynamics in the same way, collision rate function β (i, j) is expressed from the next with the relation of shear rate G:

$\mathrm{\β}(i,j)=\frac{4{\mathrm{Gr}}^3}{3}{(i^{l/d_f}+j^{l/d_f})}^3---\left(3\right)$

In formula, G value is the important parameter that represents Coulomb force flow behavior in coalescer, directly affects between particle, coalescenceCollision rate and impact strength between body, between particle and coalescence body, determine the compaction rate of coalescence body.

There is double influence to dust granules coalescence process in the turbulent fluctuation current characteristics in coalescence electric field: can increase particleCollision probability, promotes coalescence; Simultaneously due to the fragmentation of PM2.5 dust granules coalescence body is suppressed to growing up of coalescence body.Overgenerous electric current turbulent fluctuation, although increased particle collision probability, is more the increasing that destroys coalescence body in macroscopic viewTo the inhibitory action of having grown up of coalescence body, in production practices, be to wish that the coalescence body producing is easy to drive in coalescence electric field greatly,Enter, the packing that this coalescence body needs is better, is easy to arrive deduster deflector air-flow compartment system, and then in dedusterCollect, the fractal dimension of coalescence body is large, particle size is suitable, shear turbulent Turbulent characteristics can cause coalescence body destruction orBe recombinant, produce more closely knit structure. Overgenerous turbulent fluctuation, although make the packing of coalescence body good, excessiveShearing force makes coalescence body be broken into very little wadding grain, be difficult to drive in official hour into; Too small turbulence intensity cannot makeDust granules collision coalescence.

Wherein, described calculator 103, for obtaining the state variation situation of described charged coalescence body at coalescence electric field, is complied withCalculate the migration velocity of described charged coalescence body according to described state variation situation;

State variation situation according to charged coalescence body in coalescence electric field, can learn the turbulent fluctuation electricity in coalescence electric fieldThe effect of stream to this coalescence body, can obtain the migration velocity of charged coalescence body in coalescence electric field.

The migration velocity of PM2.5 coalescence body can be derived by the stress balance in electrofluid by solid sphere particle,The power that particle is subject in coalescence electric field mainly contains gravity F_g, Coulomb force F_bWith resistance F_d, and have following relation:

F_g-F_b＝F_d

(4)

If the volume of fruit granule is V_e', the density of primary particles, coalescence body and electrofluid is respectively ρ₀, ρ and ρ_w, basicThe volume of grain thing (as dust) is v, between them, has following relation:

$V_e^{\′}(\mathrm{\ρ}-{\mathrm{\ρ}}_w)g=\frac{1}{2}{\mathrm{A\ρ}}_w{C}_D{\mathrm{\μ}}^2---\left(5\right)$

ρ-ρ_w＝(1-ε)(ρ₀-ρ_w)

(6)

In formula, A represents granule surface area (cm²)；

C_DRepresent resistance coefficient, available following various expression respectively:

$A={\mathrm{\α}}_2{L}_0^{2-{\mathrm{df}}_2}{L}^{{\mathrm{df}}_2}---\left(7\right)$

C_D＝aRe^-b

(8)

$\mathrm{Re}=\frac{uL}{v}---\left(9\right)$

The migration velocity of PM2.5 coalescence body can be expressed as:

$u={\[\frac{2{\mathrm{g\α}}_0}{{\mathrm{a\ρ}}_w{\mathrm{\α}}_2}\left(\mathrm{\ρ}-{\mathrm{\ρ}}_w\right){\mathrm{\ψ}}^{{\mathrm{df}}_3/3}{L}_0^{1-{\mathrm{df}}_3+{\mathrm{df}}_2}{v}^{-b}{L}^{{\mathrm{df}}_3+b-{\mathrm{df}}_2}\]}^{1/(2-b)}---\left(10\right)$

With the pass of the characteristic length of coalescence body particle be:

In the time of the fractal dimension of research coalescence body, the calculating of two-dimensional fractal dimension generally with the area of plane to characteristic lengthRelation is obtained, and the two-dimensional fractal dimension of analyzing coalescence body is always less than or equal to 2, works as df₃≤ 2 o'clock, df₂＝df₃, formula (5) can abbreviationFor:

$u={(\frac{2{\mathrm{g\α}}_0}{a_{2}a\mathrm{\ρ}}\left({\mathrm{\ρ}}_f-\mathrm{\ρ}\right){\mathrm{\ψ}}^{{\mathrm{df}}_3/3}{L}_0{L}^b{v}^{-b}\]}^{1/(2-b)}---\left(12\right)$

Now, drive into speed with the reducing and increase of fractal dimension, reason is: fractal dimension is less, represents coalescence bodyPacking less, porosity is higher, electric current can be by the aperture in coalescence body, and the head-on electric current resistance of coalescence body is subtractedLittle, increase thereby make to drive into speed.

Work as df₃When > 2, df₂=2, formula (5) can abbreviation be:

$u={\left(\frac{2{\mathrm{\α}}_{0}g}{a_2\mathrm{\ρ}a}\right({\mathrm{\ρ}}_f-\mathrm{\ρ}\left){\mathrm{\ψ}}^{df/3}{L}_0^{3-df}{L}^{b-2+df}{v}^{-b}\right)}^{1/(2-b)}---\left(13\right)$

Coalescence body drive the double influence that is subject to coalescence body packing and fluoran stream surface electric current resistance into speed, ordinary circumstanceUnder, work as df₃Hour, there are many endoporus coalescence body inside, and the fluoran stream surface of coalescence body in sinking process reduces, and coalescence body sinksTime resistance less, this effect can improve coalescence body migration velocity, but now the packing of coalescence body is very little, coalescence bodyGravity is very little, can make again migration velocity decline, and the two comprehensive function determines the actual migration velocity of coalescence body, packing be withThe three-dimensional fractal dimension of coalescence body is correlated with, and fluoran stream surface is long-pending only relevant with the two-dimensional fractal dimension of coalescence body, because three-dimensional is dividedShape dimension is always greater than the two-dimensional fractal dimension of same coalescence body, so packing is greater than fluoran stream surface to the impact of migration velocityLong-pending impact, at df₃≤ 2 o'clock, the packing of coalescence body was very low, because the decline migration velocity decline effect that causes of packing is largeThe migration velocity long-pending in fluoran stream surface increases effect, and therefore, along with the increase of coalescence body fractal dimension, migration velocity declines gradually,At df₃After > 2, packing increases effect to migration velocity and is greater than the long-pending minimizing effect to migration velocity of fluoran stream surface, migration velocityIncrease with fractal dimension increases.

In this application, the driving into carrying out charged coalescence body mainly for the relation between packing and migration velocityAnalyze.

Wherein, described electric field adjusting device 104 is for the migration velocity according to described charged coalescence body, to this charged coalescence bodyDrive into the trend of motion and analyze, do not meet defaultly when regular when analysis obtains described trend, regulate described coalescence electricityField changes the migration velocity of described charged coalescence body.

The parameter of coalescence electric field can be learnt in advance, according to the shape of the carrying capacity obtaining in step S1031 and this coalescence bodyState (comprising: every morphological parameters, as the characteristic length L of coalescence body, form factor a, density p etc.) and coalescence electric field is everyParameter, just can calculate the stressing conditions of this coalescence body in coalescence electric field.

The migration velocity of this coalescence body comprises: drive into direction and drive into speed.

According to the stressing conditions of charged coalescence body, the size and Orientation of the acceleration of known this coalescence body.

From Acceleration Formula, this coalescence body, under this stressing conditions, is driving into the move distance in direction, in instituteState and drive in direction, the distance that described charged coalescence body can move, i.e. this charged coalescence body motion in coalescence electric field becomesGesture.

Default rule is that charged coalescence body can not arrive coalescer inwall.

When the movement tendency of this charged coalescence body in coalescence electric field is for can not arrive coalescer inwall, do not need thisThe movement tendency of charged coalescence body is adjusted;

When the movement tendency of this charged coalescence body in coalescence electric field is, can arrive coalescer inwall time, this coalescence to be describedBody can not be collected, and need adjust the movement tendency of coalescence body, and this movement tendency is the migration velocity that is subject to coalescence bodyImpact, can realize by the migration velocity that regulates this coalescence body, and the migration velocity of this coalescence body is the impact that is subject to packing,And this packing is relevant to fractal dimension, the fractal dimension of this coalescence body is subject to the impact of coalescence electric field. Therefore, regulate described coagulatingAnd the intensity size of electric field can reach the object that the migration velocity of described charged coalescence body is changed.

In the embodiment of the present application, to the movement tendency of charged coalescence body be by can move distance and this coalescence body work asBefore and distance between dust collecting pole plate compare, judge whether to meet and drive into rule, but be not limited to this, in actual enforcementAlso can adopt other manner of comparison.

In the present embodiment, the mode that regulates coalescence electric field is the intensity size that regulates described coalescence electric field, but does not limitIn this, in actual enforcement, also can adopt the frequency that regulates coalescence electric field.

Referring to Fig. 7, show a kind of charged coalescence body that the application provides in coalescence electric field drive into control method andThe application scenarios of the embodiment of system in reality is implemented.

The charged coalescence body of PM2.5 enters and gathers dust in coalescence electric field, under the effect of coalescence electric field, gravity etc., and this coalescence bodyTo the motion of deduster deflector air-flow compartment system, finally arrive deduster place, reach the final purpose of dedusting.

Picture pick-up device 101 is arranged near coalescence electric field, takes for the charged coalescence body to coalescence electric field,To the image of described charged coalescence body;

Path maker 102 is connected with picture pick-up device 101, for described image is processed, obtains described charged solidifyingAnd the state variation situation of body in coalescence electric field;

Calculator 103 is connected with path maker 102, for obtaining the state of described charged coalescence body at coalescence electric fieldSituation of change, the described state variation situation of foundation calculates the migration velocity of described charged coalescence body;

Electric field adjusting device 104 is connected with coalescence electric field power supply with calculator 103 respectively, for the described charged coalescence body of foundationMigration velocity, driving into the trend of motion of this charged coalescence body analyzed, do not meet pre-when analysis obtains described trendIf regular time, regulate described coalescence electric field make described charged coalescence body migration velocity change.

In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and otherThe difference of embodiment, between each embodiment same or similar part mutually referring to.

The above is only the application's preferred embodiment, it should be pointed out that the ordinary skill people for the artMember, not departing under the prerequisite of the application's principle, can also make some improvements and modifications, and these improvements and modifications also shouldBe considered as the application's protection domain.

Claims (3)

1. charged coalescence body driving into a control method in coalescence electric field, is characterized in that, comprising:

Charged coalescence body in coalescence electric field is taken, obtained the image of described charged coalescence body;

Described image is processed, obtained the state variation situation of described charged coalescence body in coalescence electric field;

Obtain the described state variation situation of described charged coalescence body in coalescence electric field, calculate according to described state variation situationObtain the migration velocity of described charged coalescence body;

According to the migration velocity of described charged coalescence body, driving into the trend of motion of this charged coalescence body analyzed, when dividingAnalyse and obtain described trend and do not meet defaultly when regular, regulate described coalescence electric field that the migration velocity of described charged coalescence body is changedBecome; Wherein, the state variation situation of described charged coalescence body in coalescence electric field comprises that the motion path of coalescence body and form becomeChange;

Described image is processed, is obtained the state variation situation of described charged coalescence body in coalescence electric field and comprise:

Each the image obtaining carried out to sequential arrangement;

The form of charged coalescence body in each image is copied in the same coordinate system system successively, will indicate the form of each positionPoint is connected, and obtains the state variation situation of described charged coalescence body in coalescence electric field;

The migration velocity that calculates described charged coalescence body according to described state variation situation comprises:

Motion path according to described charged coalescence body in coalescence electric field obtains the carrying capacity of described charged coalescence body;

According to carrying capacity and the form of described charged coalescence body, calculate the packing of described coalescence body;

Calculate the migration velocity of described charged coalescence body in coalescence electric field according to described packing;

According to the migration velocity of described charged coalescence body, driving into the trend analysis of motion of this charged coalescence body comprised:

According to carrying capacity and the form of described charged coalescence body, calculate the stressing conditions of described coalescence body;

Obtain driving into direction and driving into speed of described charged coalescence body according to the migration velocity of described charged coalescence body;

According to driving into speed and stressing conditions of described charged coalescence body, calculate and drive in direction described, described charged solidifyingAnd the distance that can move of body.

2. method according to claim 1, is characterized in that, regulates described coalescence electric field to comprise: to regulate described coalescence electricityIntensity size and the frequency of field.

3. charged coalescence body driving into a control system in coalescence electric field, is characterized in that, comprising:

Picture pick-up device, takes for the charged coalescence body to coalescence electric field, obtains the image of described charged coalescence body;

Path maker, for described image is processed, obtains the state of described charged coalescence body in coalescence electric field and becomesChange situation; The state variation situation of described charged coalescence body in coalescence electric field comprises that the motion path of coalescence body and form becomeChange;

Calculator, for calculating the migration velocity of described charged coalescence body according to described state variation situation;

Electric field adjusting device, for the migration velocity according to described charged coalescence body, to the becoming into motion of driving of this charged coalescence bodyGesture is analyzed, and does not meet defaultly when regular when analysis obtains described trend, regulates described coalescence electric field to make described charged solidifyingAnd the migration velocity of body changes;

Wherein, described path maker specifically for:

Each the image obtaining carried out to sequential arrangement; The form of charged coalescence body in each image is copied to same seat successivelyIn mark system, the form point that indicates each position is connected, obtains the state variation of described charged coalescence body in coalescence electric fieldSituation;

Described calculator specifically for:

Motion path according to described charged coalescence body in coalescence electric field obtains the carrying capacity of described charged coalescence body; According to instituteState carrying capacity and the form of charged coalescence body, calculate the packing of described coalescence body; Calculate described charged according to described packingThe migration velocity of coalescence body in coalescence electric field;

Described electric field adjusting implement body is used for:

According to carrying capacity and the form of described charged coalescence body, calculate the stressing conditions of described coalescence body; According to described charged solidifyingAnd the migration velocity of body obtains driving into direction and driving into speed of described charged coalescence body; According to described charged coalescence body drive intoSpeed and stressing conditions, calculate and drive in direction described, the distance that described charged coalescence body can move.