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Publication numberUS2190190 A
Publication typeGrant
Publication dateFeb 13, 1940
Filing dateMar 19, 1938
Priority dateMar 19, 1938
Publication numberUS 2190190 A, US 2190190A, US-A-2190190, US2190190 A, US2190190A
InventorsPeterson Eric G
Original AssigneePeabody Engineering Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fuel burner
US 2190190 A
Abstract  available in
Images(4)
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Claims  available in
Description  (OCR text may contain errors)

Feb. 13, 1940. E. G, PETERSON FUEL BURNER Filed March 19, 1938 4 Sheets-511er:4 1

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Feb. 13, 1940. E. G. PETERSON FUEL BURNER Filed March 19, 1938 4 Sheets-Sheet 3 Feb. 13, 1940. E. G. PETERSON FUEL BURNER Filed March 19, 1938 4 Sheets-Sheet 4 Patented Feb. i3, 1940 FUEL BURNER Eric G. Peterson, Glen Ridge, N. J., assignor to Peabody Engineering Corporation, New York,

Application March 19,

5 Claims.

The invention herein disclosed relates to fuel burners generally, but in some respects more particularly to marine type burners.

In naval operations it has become a practice 5 to separate the boilers from the re room by a 4gas and water-tight bulkhead forming in effect a wind box about the air registers of the burners. The burner controls of necessity extend through such a bulkhead.

Special objects of the present invention are to provide practicable and efficient mounting and control of such burners, particularly to maintain the required gas-tight and water-tight relation of parts at opposite sides of the bulkhead, to allow for such expansion and weaving as may naturally occur in such constructions and to prevent such relative movement from affecting or interfering with proper control and use of the burners.

Additional objects of the invention are to obtain more thorough and intimate mixing of the air with the fuel, to enable operation with the diffuser positioned within the air register, instead of at the minimum throat diameter rearward of the air register as heretofore and in this way to effect with a given draft loss, combustion of a greater amount of fuel per square inch of throat area. A further object is to enable air supply to a burner to be completely cut off when one of a group of burners firing the furnace is shut down, as practised in marine work.

Further objects and the novel features of construction, combinations and relations of parts by which the purposes of the invention are attained will appear and are definitely set forth in the following specification and illustrated in the accompanying drawings.

The drawings accompanying and forming part of this specification show by way of illustration certain preferred embodiments of the invention and such as are now considered the best modes of applying the underlying principles. Other embodiments of the invention employing the same or equivalent principles may, however, be used and structural changes made as required or desired by those skilled in the art, Without departure from the present invention and within the true spirit and `broad scope of the patent claims herein.

Figure 1 is a broken vertical sectional view of one of the burners.

Figure 2 is a view similar to Figure 1 illustrating a modified form of operating control.

Figure 3 is a broken sectional detail showing 193s, serial No. masia (on. 15s- 1.5)

portions of the air register as on substantially line 'I--l of Fig. 2.

Figure 4 is a broken and part vertical sectional view of a modified form of burner as constructed for use without the separating bulkhead and with the radial vanes adjustable to operate as a damper and the `diffuser equipped with a shroud.

Figure 5 is a broken and part sectional side elevation of a modified form of diluser with two sets of adjustable air controlling blades.

Figures 6 and 7 are broken sectional views as on lines Ill-IIJ and II--Il of Figure 5.

Figure 8 is a broken detail of the radial dampers and front ring which pivotally supports the outer ends of said radial dampers.

The naval type burner shown in Figure 1 is designed for installations where a bulkhead l covers the furnace front 8. This bulkhead is shown as having an opening la of suiicient size for complete removal of the burner therethrough and which opening is normally closed by a re` movable finish ring 1b.

The air register of the burner is shown as of the general type disclosed in Peabody Patent No. 1,527,214 of February 24, 1925, having curved doors 9 in frustro-conical arrangement pivotally engaged on the spacer sleeve 9a about the connecting bolts I between the back plate Illa and the front supporting ring II.

Adjustment of the air doors from closed overlapping condition to a partially or wholly open condition is effected in the illustration from a ring I2 rotatably held on the supporting ring II by confining clips I3 and having rearwardly projecting pins I4 engaging in slotted adjusting cams I extending from the front ends of the doors.

A bearing is shown at IB removably bolted at I1, Figure 4, on the support ring II, in which is journaled a short door adjustment shaft I8 carrying at its rearward end a slotted lever arm I9 engaging a pin 20 on the front of the adjusting ring I2. At the front end this shaft is shown as carrying a lever 2| slotted at 22 to receive a crank pin 23 on the rearward end of an operating handle shaft 24 journaled in the nishring lb of the bulkhead at 25 and provided with an operating handle 25 on its exposed front end at the front of the bulkhead. The bearing for this operating handle shaft is shown as equipped with a stuffing box 21 and an abutment shoulder 24a is shown on this shaft engageable with the inner end of the bearing to prevent outward movement such as might disengage the crank pin 23 from slotted lever 2I. y

The mounting of the operating handle in the finish ring of the bulkhead independently of the rest of the burner and the slotted lost motion connection at 23 between this handle and the air register allow for relative movement between bulkhead and.burner such as might result from expansion or weaving and prevent such movements from varying or interfering with the desired setting of the air register.

Preferably, the air register is denitely retained in the position of'desired adjustment by means such as a notched segment on the operating ring I2 engaging a spring detent mounted on the register support ring I I. This segment may be notched to hold the air doors-,9 in the closed, open and partly open positions of adjustment. The spring detent thus constitutes in eiect a releasible locking means. If the furnace front 8 and lever 2| supported therefrom move relative to the bulkhead, the operating handle 26 may rotate slightly due to the motion transmitted by pin 23 and shaft 24; however, as handle 26 is free to rotate in bearing 25 no strain is imposed on the linkage of .such operating mechanism because of such relative motion.

To increase the turbulence and whirling effect and to augment the supply of air admitted about the periphery of the register, there is provided in the illustration a bladed front cover for the register, indicated as a ring 30 bolted to the register support ring I I at 3| and having conically disposed frontwardly inclined spaced curved blades 32a designed to impart rotation to an axially entering stream of air in the same sense as the rotation imparted by the peripheral air doors. In some instances these blades may be placed to impart opposite rotation or no rotation at all to the axially entering stream of a1r. i

To shut oi or adjust the axial supply of air, there is provided in the present disclosure, Figs. 1 and 2, a series of radially disposed dampers 32 journaled at their outer ends at 33 in the annular ring portion 30 of the bladed iront cover and rotatably held at their inner ends in seats 34 in the hub portion 41 of this cover by an overstanding damper hub 35, secured to hub portion 41 by bolts 36.

'I'he inner journaled ends of the dampers 32 are shown as formed with crank extensions 31 engaging in slots 38 in a damper operating cylinder 39 rockably mounted on a support tube 40. This rocking damper operating cylinder is shown as having a lever arm 4I carrying a pin 42 engaged in slot 43 in an arm 44 projecting from the air door adjustment shaft I8. Actually this arm 44 may be and ls shown as a reversely extending portion of the slotted lever 2| which provides part of the connection with the hand crank 26.

The splitting of the bearings 34 for the radial dampers 32 between the front cover hub 41 and damper hub 35 enables easy assemblage of the parts by slippingv the outer journal ends of the dampers in the bearings 33 and then applying the separable hub portion 35 over the inner journal ends of the dampers.

It will be apparent that adjustment of the air doors by operating handle 26 also will eect adjustment of the dampers controlling the axial 'now of air and in the same sense, that is, in the same opening or closing direction. The relation of parts is preferably such that these dempers will be fully opened or fully closed as the peripheral air doors are fully opened or fully closed. It is contemplated that for some installations the adjustment of the air doors and the dampers may be independent one of the other.

'Ihe support tube 40 is shown as secured by an inclined set screw 45 in a deep seat or socket 46 in the i'rontend of the support tube hub 41 joining the inner ends of the iixed or stationary deiiector blades 32a.

To provide a sealing connection between the support tube 46 and the iinish ring 1b of the bulkhead, an annular corrugated expansion tube 43l is shown about the support tube secured at its rearward end by an adjustable sealing ange 43 to an expansion tube connector 50 on the nnish ring and similarly held at its front end by an adjustable sealing ange 5I to the support tube hub 52 iixed at 53 on the front end of the support tube. Gaskets |25 are provided intermediate 43 and 56 and intermediate 5I and theflange` portion of hub 52 for properly sealing the flexible bellows or Sylphon 48 at its ends.

Within the air register portion oi the burner is a conical diffuser 55 ilxedly secured upon a dliIuser pipe 54, which pipe is supported in rear bearing 56 and front bearing hub 52. Hub 52 is secured to 4II- by a set screw 53. Set screw 53 seats upon a metallic gasket which in turn seats on aspot faced boss so as to obviate leakage at this point.

A stufiing box flange 51 is shown adjustably secured at 58, to the hub member 52 on the front end of the support tube for providing a stulng box connection between said support tube hub and diiuser pipe 54 protruding therethrough and a set screw is indicatedon this stuilng box ange at 58 for securing the diffuser pipe in various positions of in and out adjustment.

To coniine the diuser pipe to straight in and out adjustments and prevent rotation of the atomizer which is carried thereby, a guide screw is shown at 60 extending through the support tube and into a longitudinal slot 6I in the top of the diiuser pipe. This screw also is located to serve as an abutment for retaining the damper operating cylinder 39 in engagement with cranks 31 of the damper vanes 32.

The diffuser 55, in Figs. l and 2, is shown as of conical form and as radially corrugated, with slots 62 cut through adjoining the peaks or ridges of the corrugations, in line with the surfaces at the inside, as in Fig. 2, and at the proper side of the ridges to effect rotation inside the diffuser in the same sense as the peripherally and axially entering primary and secondary supplies of air. The end portion 56 of hub 41 adjacent the diiuser is shown as formed with an annular cutout 63 to seat the hub portion of the diffuser when the latter is backed out to the outer limit of adjustment.

The design of the diffuser, by the identity of al1 corrugations is such as to permit with the samek casting, cutting the slots 62 for either clockwise or counterclockwise rotation of air, as may be required by the direction of air rotation through air doors 8, dampers 32 and stationary blades 32a.

The radial dempers 32 are shown as closing at their peripheral edges against an annular sealing shoulder 82. They are indicated further as having vane portions 83, extended beyond their pivoting axes 33, and shorter than the body portions or the dampers at 83a, so as to swing inero side and clear the sealing shoulder 82, as the dampers are opened and to lap behind the forward edge of the adjoining damper when the dampers are closed. These radial dampers are thus made' capable of effectively closing oi the axial flow of air.

Figure 2 illustrates a modification in which the operating handle 26a is carried by a shaft 24a 'which is journaled in a bearing and stuiiing box 21a carried by an annular enlargement or head 84 on the hub 52a on the end of support tube 40. A pinion 85 on the rear end of shaft 24a meshes with a ring gear 86, iixed on the front end of a sleeve`81, rotatable upon the support tube as a bearing, within the expansion tube 48 and connected at the rear by set screws 98 with the damper operating cylinder 39a. A flange 99 closing the back of the annular head 84 enables assembly of pinion 85 with ring gear 86 and serves as a mounting for the sealing flange lconnection 5| for the front end of expansion tube 48. This construction permits the joint between flange 99 and the ring 5| at the outer end of expansion tube 48,- to be maintained if it be found desirable to remove the entire gear assembly and which latter is possible upon release of the bolt fastenings 99a,

vconnecting flanges 84 and 99, and releasing set screws 53 and 59, Fig. 2.

The lever arm Ma projecting from the cylinder 39a in the Figure 2 construction, carries a pin 62a engaging in slot 43a of arm 44a vdependent from the air door operating shaft i0.

The operating handle 26a is shown as having a spring pressed detent 88 engageable in notches in a segment 89 mounted on the front endv of the support tube hub 52a, which latter is in effect an extension of the bladed front cover 38. A stop 90 is shown adjustably secured at 9| on this segment to limit the throw of crank 26a to the desired maximum opening movement of air doors 9 and dampers 92. The operating handle 26a and all the intermediate train connecting it with dampers 32 and air doors 9 are supported on the furnace plate 8. Consequently, any relative motion between the furnace front and bulkhead 'l will have no effect upon the setting of the air doors, dampers and adjusting handle and these will not be subjected to distorting stress.

Where bulkhead operation is not required, the burner may be constructed as illustrated in Figure 4, with the door operating shaft extended as at |90. and directly carrying the crank arm ||l| in which is rotatably mounted the hand wheel 26h. The spindle of this hand wheel is shown as screw-threaded at the back at |02 to carry a clamp plate |03 and set screw which latter, by turning of the hand wheel can be made to grip a fixedly supported indicating and locking quadrant |04 against the back of the crank arm.

'I'he clamp block |03 is loosely held in a nonrotatable relation in a recess |05 in the back of crank arm |0|. Upon turning the hand Wheel in one direction the clamp plate can be freed of gripping engagement with the quadrant and the crank arm i0! be then swung by the hand wheel in one direction or the other to completely or partially open or close the air doors and dampers and when the desired adjustment is effected, the hand wheel can be rotated in the opposite direction to secure the crank arm in locked engagement with the quadrant, which with suitable indications on the front of the same will then show at a glance the position in which the peripheral air doors and dampers are secured.

In the construction shown .in Fig. 4, the dampers 32 are omitted and control of the axial flow of yair is accomplished by making the axial flow directing vanes adjustable instead of non-adjustable. Ihese vanes, here designated 32h, are shown as having pivot pins |06, at their inner ends, journalled in bearings |01, in the support tube hub 56, and pivot pins |08, attheir outer ends, journalled in the support ring a and having cranked portions |09 engaged in slots H0, of the damper operating ring journalled on the front of support ring 30a. This damper operating ring by slotted lever 44a of the hand crank shaft |8a.

Also in Fig. 4, the diffuser is shown as carrying a shroud sleeve H3, extending in overlapping relation at I I4, over the inwardly projecting fixed shroud sleeve H5, carried by the front support ring 30a,

The structure of the diffuser may be further varied. Particularly, provision may be made for variable regulation of air flowing into and through the diffuser cone. Thus as shown in Figs. 5, 6 and 7, the air passages through the diffuser cone may be provided between overlapping blades I8, adjustably held by the bolts H1, between the inner and outer cone rings l I8, I9.

Figs. 5 and 6 show how the hub |20 of the diffuser may carry a cylindrical air inlet member having peripheral air inlets provided between the overlapping blades |2l, adjustably secured by bolts |22.

It is realized that in some instances, it is desirable to have both conical and circumferentially arranged adjustable air inlet lblades in the dif- Operation The burner structure is supported from the furnace front 8 and the parts which project through the bulkhead are flexibly sealed to that wall so that misalinement, weaving and any relative movements as between furnace and bulkhead will have no injurious effect on the mechanism, operation or adjustment of the burner. The corrugated expansion tube 48 which seals the front end of the support tube and the support tube hub 52 to the nlsh ring of the bulkhead is suiiiciently flexible to allow for such movements and can be both gas-tight and liquidtight to prevent flow of gas in either direction and to prevent iiow of water in case of flooding at either side of the bulkhead. VThe same sealing effect is accomplished at the control handle 26 or 26a which operates through a stuffing box either in the finish ring of the bulkhead as in the first example, Figure 1, or in the support tube hub as in the second example, Figure 6. `In the first instance, the lost motion or pin and slot connections such as designated 22, 23, 42, 43, Figure l, prevent vibration or shifting of the bulkhead wall from affecting the burner adjustments.

` In the construction shown in Figure 2, no lost motion is required since there is no relative movement between handle 26a and the parts which it operates. In both examples, the rocking of the operating handle 26 or 26a one way or the other vis shown as carrying at the top a pin I2, engaged i will effect angular rotative movement of the ring I2 for adjusting the air doors 9 in an opening o r closing direction and a rocking of the operating cylinder 39 or 39a to turn the damper vanes 32 in a corresponding opening or 'closing direction.

Thus, the secondary axial supply of air controlled by dampers 32 is controlled simultaneously and if desired proportionately to the primary supply of air admitted by peripheral doors 9. The air doors and dampers are linked together so that the securing of the adjusting ring I2 serves to secure both in the desired position of adjustment. As the area controlled by dampers 32, even when these are in partially closed position can be, and is as illustrated, materially greater than that between the fixed blades 32a, adjustments of dampers 32 by operating handle 26 or 26a within the range of handle movement required to produce the desired variation in the operating position of doors 9, will not restrict to a measureable degree the flow of air through blades 32a. Thus, while ilow through doors 9 may be varied, the ow through blades 32a may be substantially constant. The connecting linkage is so proportioned that dampers 32 will close fully when air doors 9 are in the closed overlapping position.

The ilxed radially extending and conically disposed blades 32a direct the axial iiow of secondary air tangentially and outwardly, imparting a whirling motion in the same sense as that imparted to the main air supply admitted by the peripheral curved set of doors 9.

This provides a greater iiow of air to the burner throat and hence greater capacity for a given draft loss than could be obtained with flow through peripheral doors 9 only. Furthermore, the tangential axial ow stabilizes pressure conditions at the front of the register which, due to the vortex action created near a solid front cover with air admitted through peripheral doors 9 only, tends to be somewhat unstable under the especially severe operating conditions of naval boiler ring.

Part of the whirling air from blades 32a being directed outwardly, mingles smoothly with the flow of air entering by Way of doors 9, passes over the periphery of diffuser 55 and is directed Yinto the diverging oil spray from tip 80 by conical back plate Illa. Another portion of this whirling flow of air is directed towards the conical front of diffuser 55 and passes through radial slots 62 in the sides of the'corrugations and acrossl the inclined faces at the inside of the diffuser, in the same whirling sense breaking up and mingling with the spray issuing from atomizer tip 80.

The back plate Illa of the resister, having its front conical face perpendicular to the peripheral door centers I0, instead of being curved or in two joined corneal sections as in customary practice and making an acute angle with the burner throat |00, directs the rotating air toward the oil spray in such a way as to effect maximum mixing effect without undue flame spread in the furnace. The diffuser being located wholly within the conical air register has a minimum of choking eiect on the burner orifice.

If conditions require the shutting-down of any burner of a group firing one furnace, this can be effected quickly by shut-oir of fuel and turning of the operating handle 26 or 26a to close the air doors 9 and dampers 32. In this operation the air register is completely closed against air flow through it into the furnace and as the atomizer is withdrawn, the diffuser pipe is automatically closed' against gas or water ow in either direction and maintained sol by the self-A closing check valves.

It will be noted that possible points of leakage between boiler room and re room and vice versa and the sealing of same are: between bulkhead 1 and finish ring 1b, sealed by a bolted gasket joint; bearing 25 and finish ring 1b, sealed by a welded or similar connection; .shaft 24 and bearing 25 sealed by stuffing box 21; finish ring 1b and expansion tube connector 50, sealed by a bolted gasket joint; connector 50 and expansion tube 48, sealed by a iianged gasket joint at 49; expansion tube 48 and support tube hub 52, sealed by a flanged gasket Joint at 5l; support tube hub and diuser pipe 54 sealed by a stufilng box at 51; diffuser pipe and coupling case 64, sealed byl a pipe thread or similar connection; coupling casing, sealed by check valves 61, 68. Thus, with the atomizer removed, no iiow is possible from one compartment to the other.

With the atomizer inserted, the seal provided by check valves 61, 63 is broken. However, the securing of the atomizer in 'ring position automatically seals it in the outer end of the coupling and check valve casing at 18.

While illustrated in the form of a liquid fuel burner, the invention is adapted also to burners for gaseous and solid fuels, alone or in combination with liquid fuel. It is contemplated that the structure may be altered and designed to meet special requirements. For example, as in Fig. 8, the dampers 32 may be omitted and the bladed front cover `be modied by mounting the blades 32a for adjustment so that they will serve the function of dampers as well as deiectors. For some special purposes these blades may be arranged for rotation of the secondary air opposite to that of the primary air admitted by the doors or the blades be disposed in a plane perpendicular to the axis or in a reversely inclined cone from that shown.

Individual units of the burner, such as the automatic check valve coupling may be used with atomizers and air registers of types different from those illustrated and similarly, the air register comprising the truste-conical and rotary axial air admission control may be used without the special structure required for avoiding leakage in bulkhead firing. y

Without the bulkhead the burner can be simpler and more compact, as shown in Figure 4, with the parts close-coupled and the hand control crank directly on the forward end of the air door operating shaft. The hand wheel 2Gb in this form of the invention provides a means for securing and locking the air doors and dampers in any one of an infinite number of adjustments.

In all forms of the invention the parts are readily assembled and are readily accessible for inspection, removal or repair. Upon taking oi the finish ring 1b in the bulkhead type burner, Figures 1 and 2, the entire air register is exposed and,'if desired, may be removed as a unit in its assembled condition through the bulkhead opening 1a.

The adjustable telescopic shroud Fig. 4 may be substantially cylindrical as shown, or otherwise. shaped to maintain desired separation of the peripherally'and axially entering whirling streams of air. f

The diffuser structures illustrated in Figs. 5 and 6 with circumferential slots and conically arranged slots for entry of air, particularly in the adjustable blade forms, enable desired control of air ilow to the inside of the cone.

The telescopic relation between the cylindrical shroud member I I3, Fig. 4, carried by the perimeter of the diffuser or flame cone and extending rearwardly from `the furnace opening and the second fixedly supported cylindrical member I I5, enables any desired axial adjustments of the iiame cone to be made without impairing the shielding eifect of the shroud. In all such adjustments, this shield prevents rearwardly directed air streams flowing toward the furnace opening from striking the outer surface of the cone and deflecting therefrom into the path of air streams entering through the register doors.

By forming the slots 43 and 43a, Figs. 1, 2 and 4 in different cam shapes, various desired proportional operations of the air doors 9 and shutters 32 can be eected. The ilexible bellows seal I 48, Figs. 1 and 2, may be of helical design and have screw engagement at opposite ends in the retainer iianges 50 and 5|. In practice, the bellows is usually screwed entirely through such ilanges to expose the ends of the bellows to ,suitable gaskets |25, interposed between end flanges 50, and the securing anges 49 and |26 Fig. 1 and 49 and 99 Fig. 2, which are opposed thereto. Thus these gaskets directly engage flange portions at the ends of the bellows and the portions of the bellows which are -screwed in the end flanges take all mechanical strains. thereby relieving the seal portions of strain. l

The invention may be modied and changed to meet particular requirements and the special features of the invention may,'in some cases, be employed alone or used in different combinations.

What is claimed is:

1. An air register having a peripheral set of air doors and a bladed front cover for admitting 2'. An air register having a peripheral set of air doors and a bladed iront cover for admitting an axial ilow of air, said bladed vfront cover having a central hub portion, a supportr tube carried by and projecting from said hub portion of said bladed front cover, radially disposed dampers pivoted at their outer ends in said bladed front cover structure and having their inner ends rotatably engaged with said hub portion, a damper hub removably engaged over said inner endsr of the radial dampers and means engaged with said dampers for variously adjusting the same.

3. An air register of the character disclosed, comprising peripherally arranged air doors, radially disposed .air defiecting blades, dampers controlling axial air flow to said radial blades, the ilow area by said dampers being materiallygreater than that by said radial blades, means for effecting adjustment of said peripheral air doors and said dampers and including operating connections between said dampers and peripheral air doors to cause said axial flow to remain substantially constant through thel range of operating settings of said peripheral air doors and to eiect the closure of said dampers with the closure of said peripheral air doors.y

4. A burner, comprising in combination, an air register having peripherally disposed adjustable doors to regulate and direct air ilow, centrally disposed fuel supply means, blade means for directing supplemental air axially of said register and outwardly with rotary motion, said peripheral doors and blade means cooperating to stabilize air flow in the burner and adjustable damper means for. shutting oif or permitting air ilow to said blade means.

5. An air register, having a peripheral set of air doors and a iront cover with openings for admitting an axial iow of air, said front cover having a central hub portion, a support tube carried by and projecting. from said hub portion, a cylinder journalled to rock on said support tube, said cylinder having slots therein, radially disposed dampers pivotally mounted on said front cover and having cranked inner ends engaged in said slots in said rocking cylinder, an air -door operating ring rotatably mounted on said front cover, and operating means for said rocking cylinder and ring.

ERIC G. PETERSON.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2515843 *Aug 12, 1946Jul 18, 1950Shell DevAir register for burners
US3285240 *Jul 10, 1964Nov 15, 1966Indugas Ges Fur Ind GasverwendIndustrial gas burner
US4412810 *Mar 4, 1981Nov 1, 1983Kawasaki Jukogyo Kabushiki KaishaPulverized coal burner
US4457241 *Feb 23, 1983Jul 3, 1984Riley Stoker CorporationMethod of burning pulverized coal
Classifications
U.S. Classification137/607, 431/186, 431/184
International ClassificationF23C7/00
Cooperative ClassificationF23C7/006
European ClassificationF23C7/00A1A