EP0248708B1 - Process for controlling a plant for producing cement by the dry way with precalcination - Google Patents

Process for controlling a plant for producing cement by the dry way with precalcination Download PDF

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Publication number
EP0248708B1
EP0248708B1 EP87401168A EP87401168A EP0248708B1 EP 0248708 B1 EP0248708 B1 EP 0248708B1 EP 87401168 A EP87401168 A EP 87401168A EP 87401168 A EP87401168 A EP 87401168A EP 0248708 B1 EP0248708 B1 EP 0248708B1
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Prior art keywords
heat
kiln
supplied
clinker
calculated
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EP87401168A
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German (de)
French (fr)
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EP0248708A1 (en
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Philippe Benoit
Alain Chielens
André Pinoncely
Florence Osselin
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Fives Cail Babcock SA
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Fives Cail Babcock SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/42—Arrangement of controlling, monitoring, alarm or like devices

Definitions

  • the subject of the present invention is a method for regulating a cement manufacturing installation in the dry process comprising a precalcination chamber in which the raw material is at least partially decarbonated, a rotary tubular oven equipped with a burner at its outlet end. clinker, a heat exchanger where the raw material is preheated by means of exhaust gases from the rotary kiln and the precalcination chamber and a clinker cooler.
  • the purpose of the present invention is to allow the taking into account of the modifications of the essential operating parameters of the installation as soon as they appear, for the determination of the set value of the fuel flow rate.
  • the quantity of heat supplied to the precalcination chamber may be calculated from a predetermined nominal theoretical heat quantity and from correction coefficients taking into account the differences between the measured values and the nominal values of the calculation parameters.
  • the set value calculated for the flow of fuel to be supplied to the furnace can be corrected as a function of the difference between the measured value and the set value of a quantity representative of the quality of the clinker, in particular its free lime content. .
  • this correction can be made as a function of the apparent temperature of the clinker at the furnace outlet in accordance with the process which is the subject of French patent 85.03660.
  • the progressive modification of the set value of the fuel flow regulator supplied to the furnace can be carried out by sending to the regulator a signal proportional to the calculated set value and distributed to the regulator by a function which takes into account the thermal history. material in the oven, for example using a second order filter.
  • This installation comprises a cyclone exchanger 1 to 8, a precalcination chamber 10 with which is associated a cyclone 9, a rotary tubular furnace 12 and a clinker cooler 14.
  • the exchanger comprises a first line of cyclones 2, 3, 4 , 5 which are crossed by the exhaust gases from the furnace 12 and a second line of cyclones 1, 6, 7, 8 which are crossed by the exhaust gases from the chamber 10.
  • the raw raw material in the form of flour, is introduced at A and B into the upper stages of the two cyclone lines, heated by the exhaust gases from the oven and from the calcination chamber, then admitted into the latter where it is partially decarbonated.
  • the heat necessary for this reaction is supplied by the combustion of a mixture of a fuel injected into the chamber by means of a nozzle 16 and of air taken from the cooler 14 and brought to the chamber by a conduit 18.
  • the partially decarbonated material is carried out of the chamber 10 by the exhaust gases and transported in the cyclone 9 where it is separated from the gases to be introduced into the furnace 12 by means of the pipe 20.
  • the material which moves slowly, from one end to the other, in the opposite direction to the hot gases produced by a burner 22 is completely calcined and clinkerized.
  • the clinker produced is cooled in the cooler 14 by means of fresh air which is then used as combustion air in the oven and in the precalcination chamber.
  • a regulator 24 maintains the temperature of the gases downstream of the precalcination chamber equal to a set value by acting on the flow of fuel supplied to the chamber.
  • the purpose of this regulation is to obtain good stability of the rate of decarbonation of the material at the outlet of the precalcination chamber.
  • the temperature of the gases downstream of the chamber 10 is indeed a good image of the decarbonation rate.
  • the flow rate of the fuel supplying the burner 22 is regulated by a regulator 26, the set value of which is given by a computer 28.
  • This set value is calculated periodically, at very short time intervals (for example 10 seconds), by the computer 28, from the values measured or entered by the operator of a large number of parameters: clinker flow rate, characteristics of the raw and precalcined raw material, characteristics of the fuel, oxygen content of the exhaust gases, etc ...
  • K1, K2, ... Kn are parameters, such as the flow rate of raw material or of clinker, the rate of decarbonation of the material at the outlet of the precalcination chamber, the free lime content of the clinker, the fuel ash rate, the proportion of each fuel if several fuels are used, the oxygen content in the exhaust gases from the oven and the precalcination chamber, etc.
  • QTO is the total theoretical heat quantity corresponding to the nominal values imposed by the parameters K1, K2, ... Kn. It is predetermined either from tests or by means of a mathematical model and stored in a computer file.
  • f1 (K1), f2 (K2) ... fn (Kn) are corrective terms which involve the differences between the values of the parameters K1, K2, ... Kn coming from measurements carried out at each step of calculation and their values nominal.
  • the relationships f1, f2, ... fn are preset and the nominal values of the parameters K1, K2, ... Kn are stored in a computer file.
  • the amount of heat required for the oven is then calculated by making the difference between QT and QP, and the value obtained is possibly corrected according to the value of the output signal of a PID regulator incorporated in the computer and to which a signal is applied.
  • this parameter can be, in particular, the apparent temperature of the clinker at the furnace outlet measured by means of a radiation pyrometer 30 in accordance with the process which is the subject of French patent 85.03660.
  • the computer determines a setpoint value FF for the flow of fuel supplying the burner 22.
  • a signal proportional to the calculated setpoint value FF is distributed to the regulator 26 as a function of time, for example through a filter or any other time distribution means to allow the possible modification of the setpoint value of the regulator to be gradual and s spread over a period corresponding approximately to the residence time of the materials in the oven.
  • Figure 2 shows the variation of the setpoint of regulator 26. Initially this setpoint was FFO. At time t1, the calculated setpoint is FF1. From t1 the regulator setpoint will gradually increase until reaching FF1 after a period of time of the same order of magnitude as the residence time of the materials in the oven. It was assumed that the calculated setpoint remained equal to FF1 throughout the period considered. Otherwise, the curve would be modified to take into account the new calculated value.

Abstract

To enable the operation of a cement manufacturing installation to be controlled by taking into account changes in essential operating parameters as soon as they appear, the quantity of the total theoretical heat (QT) required to convert the raw material to clinker is calculated by applying correcting coefficients to the quantity of a predetermined total nominal heat (QTO) corresponding to nominal values imposed by parameters (K1, K2, . . . Kn) characteristic of the raw material, of the fuel, of the clinker and of the operation of the installation, the correcting coefficients taking into account differences between the nominal values and measured values of said parameters. The quantity of the theoretical heat (QF) to be supplied to the kiln is calculated by deducting the quantity of heat (QP) supplied to the precalcination chamber from the quantity of total theoretical heat (QT). A consigned value (FF1) of flow of the fuel supplied to the kiln is calculated on the basis of the quantity of the theoretical heat (QF) to be supplied to the kiln, and the actual consigned value (FFO) of the flow control is progressively modified until it has reached the calculated consigned value (FF1) of fuel flow, the progress of variations imposed on the consigned value depending on the conditions of thermal treatment of the raw material and of its dwell time in the kiln. These steps are periodically repeated at relatively close intervals of time.

Description

La présente invention a pour objet un procédé de régulation d'une installation de fabrication du ciment en voie sèche comprenant une chambre de précalcination où la matière première est au moins partiellement décarbonatée, un four tubulaire rotatif équipé d'un brûleur à son extrémité de sortie du clinker, un échangeur de chaleur où la matière première est préchauffée au moyen des gaz d'échappement du four rotatif et de la chambre de précalcination et un refroidisseur de clinker.The subject of the present invention is a method for regulating a cement manufacturing installation in the dry process comprising a precalcination chamber in which the raw material is at least partially decarbonated, a rotary tubular oven equipped with a burner at its outlet end. clinker, a heat exchanger where the raw material is preheated by means of exhaust gases from the rotary kiln and the precalcination chamber and a clinker cooler.

Ces installations sont généralement équipées de régulateurs qui règlent les débits de combustibles fournis à la chambre de précalcination et au four de façon à maintenir certains paramètres égaux à des valeurs de consigne. On a, en particulier, proposé de régler le débit de combustible fourni à la chambre de précalcination de façon à maintenir constant le taux de décarbonatation de la matière première à la sortie de la chambre, et de régler l'alimentation en combustible du brûler du four de façon à maintenir à une valeur de consigne une grandeur représentative de la qualité du clinker, qui généralement est la température dans la zone de clinkérisation du four.These installations are generally equipped with regulators which regulate the flow rates of fuels supplied to the precalcination chamber and to the furnace so as to maintain certain parameters equal to set values. In particular, it has been proposed to adjust the flow rate of fuel supplied to the precalcination chamber so as to keep the decarbonation rate of the raw material at the outlet of the chamber constant, and to regulate the supply of fuel to the burn of the oven so as to maintain at a set value a quantity representative of the quality of the clinker, which generally is the temperature in the clinkering zone of the oven.

S'il se produit dans la partie amont de l'installation une modification des conditions de marche, résultant d'une perturbation accidentelle ou d'un ordre donné par un opérateur, il faudrait, pour conserver au clinker la qualité imposée, que les conditions de marche du four, notamment la quantité de chaleur fournie, soient aussi modifiées. Or le régulateur du débit de combustible fourni au four n'a connaissance de ces modifications qu'au bout d'un délai relativement long, égal au temps mis par la matière pour aller de l'entrée du four à la zone de clinkérisation, et ne réagit qu'à ce moment-là. Mais la matière introduite dans le four pendant tout ce délai n'aura pas été soumise à des conditions de traitement normales et le clinker produit à partir de cette matière n'aura pas la qualité voulue.If there is a change in the operating conditions in the upstream part of the installation, resulting from an accidental disturbance or an order given by an operator, to maintain the quality imposed on the clinker, only the conditions operating conditions, especially the amount of heat supplied, are also changed. However, the regulator of the flow rate of fuel supplied to the furnace becomes aware of these modifications only after a relatively long period, equal to the time taken by the material to go from the inlet of the furnace to the clinkering zone, and only reacts at that time. However, the material introduced into the oven during this entire period will not have been subjected to normal processing conditions and the clinker produced from this material will not have the desired quality.

Le but de la présente invention est de permettre la prise en compte des modifications des paramètres essentiels de marche de l'installation dès leur apparition, pour la détermination de la valeur de consigne du débit de combustible.The purpose of the present invention is to allow the taking into account of the modifications of the essential operating parameters of the installation as soon as they appear, for the determination of the set value of the fuel flow rate.

Le procédé objet de la présente invention consiste à

  • - calculer la quantité de chaleur théorique totale nécessaire pour amener la matière première à l'état de clinker, à partir d'une quantité de chaleur totale nominale, prédéterminée et correspondant à des valeurs nominales, imposées, de paramètres caractéristiques de la matière première, du combustible, du clinker et de la marche de l'installation, en appliquant à cette quantité de chaleur théorique totale nominale des coefficients correcteurs prenant en compte les différences entre les valeurs nominales et les valeurs mesurées desdits paramètres,
  • - calculer la quantité de chaleur théorique qui doit être fournie au four en retranchant de ladite quantité de chaleur théorique totale la quantité de chaleur fournie à la chambre de précalcination,
  • - calculer une valeur de consigne du débit de combustible fourni au four à partir de ladite quantité de chaleur théorique à fournir au four,
  • - modifier progressivement la valeur de consigne actuelle du régulateur de débit de combustible fourni au four pour l'amener à la valeur de consigne calculée, l'allure des variations imposées à la valeur de consigne dépendant des conditions du traitement thermique de la matière et de leur temps de séjour dans le four, et
  • - recommencer périodiquement ces opérations à des intervalles de temps rapprochés, par exemple de l'ordre de une minute ou moins.
The process which is the subject of the present invention consists in
  • - calculate the quantity of total theoretical heat necessary to bring the raw material to the clinker state, from a nominal total heat quantity, predetermined and corresponding to nominal, imposed values, of characteristic parameters of the raw material, of the fuel, the clinker and the operation of the installation, by applying to this nominal total theoretical heat quantity correction coefficients taking into account the differences between the nominal values and the measured values of said parameters,
  • - calculate the quantity of theoretical heat which must be supplied to the furnace by subtracting from the said quantity of total theoretical heat the quantity of heat supplied to the precalcination chamber,
  • - calculate a set value for the flow of fuel supplied to the furnace from said theoretical quantity of heat to be supplied to the furnace,
  • - gradually modify the current set value of the fuel flow regulator supplied to the furnace to bring it to the calculated set value, the shape of the variations imposed on the set value depending on the conditions of the heat treatment of the material and their residence time in the oven, and
  • - repeat these operations periodically at close time intervals, for example of the order of one minute or less.

La quantité de chaleur fournie à la chambre de précalcination pourra être calculée à partir d'une quantité de chaleur théorique nominale prédéterminée et de coefficients correcteurs prenant en compte les différences entre les valeurs mesurées et les valeurs nominales des paramètres de calcul.The quantity of heat supplied to the precalcination chamber may be calculated from a predetermined nominal theoretical heat quantity and from correction coefficients taking into account the differences between the measured values and the nominal values of the calculation parameters.

La valeur de consigne calculée pour le débit de combustible à fournir au four pourra être corrigée en fonction de l'écart entre la valeur mesurée et la valeur de consigne d'une grandeur représentative de la qualité du clinker, notamment de sa teneur en chaux libre. On pourra, en particulier, effectuer cette correction en fonction de la température apparente du clinker à la jetée du four conformément au procédé objet du brevet français 85.03660.The set value calculated for the flow of fuel to be supplied to the furnace can be corrected as a function of the difference between the measured value and the set value of a quantity representative of the quality of the clinker, in particular its free lime content. . In particular, this correction can be made as a function of the apparent temperature of the clinker at the furnace outlet in accordance with the process which is the subject of French patent 85.03660.

La modification progressive de la valeur de consigne du régulateur de débit de combustible fourni au four pourra être réalisée en envoyant au régulateur un signal proportionnel à la valeur de consigne calculée et distribué au régulateur par une fonction qui permet de prendre en compte l'histoire thermique de la matière dans la four, par exemple au moyen d'un filtre du second ordre.The progressive modification of the set value of the fuel flow regulator supplied to the furnace can be carried out by sending to the regulator a signal proportional to the calculated set value and distributed to the regulator by a function which takes into account the thermal history. material in the oven, for example using a second order filter.

La description qui suit se réfère aux dessins qui l'accompagnent et sur lesquels :

  • La figure 1 est le schéma, donné à titre d'exemple, d'une installation de fabrication de clinker de ciment en voie sèche équipée d'un système de régulation permettant la mise en oeuvre de l'invention ; et
  • La figure 2 est une courbe des variations en fonction du temps de la valeur de consigne du régulateur de débit du combustible.
The following description refers to the accompanying drawings, in which:
  • FIG. 1 is the diagram, given by way of example, of an installation for manufacturing cement clinker in the dry process, equipped with a regulation system allowing the implementation of the invention; and
  • FIG. 2 is a curve of variations as a function of time of the reference value of the fuel flow regulator.

Cette installation comprend un échangeur à cyclones 1 à 8, une chambre de précalcination 10 à laquelle est associé un cyclone 9, un four tubulaire rotatif 12 et un refroidisseur à clinker 14. L'échangeur comprend une première ligne de cyclones 2, 3, 4, 5 qui sont traversés par les gaz d'échappement du four 12 et une seconde ligne de cyclones 1, 6, 7, 8 qui sont traversés par les gaz d'échappement de la chambre 10.This installation comprises a cyclone exchanger 1 to 8, a precalcination chamber 10 with which is associated a cyclone 9, a rotary tubular furnace 12 and a clinker cooler 14. The exchanger comprises a first line of cyclones 2, 3, 4 , 5 which are crossed by the exhaust gases from the furnace 12 and a second line of cyclones 1, 6, 7, 8 which are crossed by the exhaust gases from the chamber 10.

La matière première crue, sous forme de farine, est introduite en A et B dans les étages supérieurs des deux lignes de cyclones, chauffée par les gaz d'échappement du four et de la chambre de calcination, puis admises dans cette dernière où elle est partiellement décarbonatée. La chaleur nécessaire à cette réaction est fournie par la combustion d'un mélange d'un combustible injecté dans la chambre au moyen d'une tuyère 16 et d'air prélevé sur le refroidisseur 14 et amené à la chambre par un conduit 18. La matière partiellement décarbonatée est entrai- née hors de la chambre 10 par les gaz d'échappement et transportée dans le cyclone 9 où elle est séparée des gaz pour être introduite dans le four 12 au moyen du tuyau 20.The raw raw material, in the form of flour, is introduced at A and B into the upper stages of the two cyclone lines, heated by the exhaust gases from the oven and from the calcination chamber, then admitted into the latter where it is partially decarbonated. The heat necessary for this reaction is supplied by the combustion of a mixture of a fuel injected into the chamber by means of a nozzle 16 and of air taken from the cooler 14 and brought to the chamber by a conduit 18. The partially decarbonated material is carried out of the chamber 10 by the exhaust gases and transported in the cyclone 9 where it is separated from the gases to be introduced into the furnace 12 by means of the pipe 20.

Dans le four, la matière qui se déplace lentement, d'une extrémité à l'autre, en sens inverse des gaz chauds produits par un brûleur 22 est complètement calcinée et clinkérisée. Le clinker produit est refroidi dans le refroidisseur 14 au moyen d'air frais qui est ensuite utilisé comme air de combustion dans le four et dans la chambre de précalcination.In the furnace, the material which moves slowly, from one end to the other, in the opposite direction to the hot gases produced by a burner 22 is completely calcined and clinkerized. The clinker produced is cooled in the cooler 14 by means of fresh air which is then used as combustion air in the oven and in the precalcination chamber.

Un régulateur 24 maintient la température des gaz en aval de la chambre de précalcination égale à une valeur de consigne par action sur le débit de combustible fourni à la chambre. Le but de cette régulation est d'obtenir une bonne stabilité du taux de décarbonatation de la matière à la sortie de la chambre de précalcination. La température des gaz en aval de la chambre 10 est en effet une bonne image du taux de décarbonatation.A regulator 24 maintains the temperature of the gases downstream of the precalcination chamber equal to a set value by acting on the flow of fuel supplied to the chamber. The purpose of this regulation is to obtain good stability of the rate of decarbonation of the material at the outlet of the precalcination chamber. The temperature of the gases downstream of the chamber 10 is indeed a good image of the decarbonation rate.

Le débit du combustible alimentant le brûleur 22 est réglé par un régulateur 26 dont la valeur de consigne est donnée par un calculateur 28. Cette valeur de consigne est calculée périodiquement, à des intervalles de temps très rapprochés (par exemple 10 secondes), par le calculateur 28, à partir des valeurs mesurées ou entrées par l'opérateur d'un grand nombre de paramètres : débit de clinker, caractéristiques de la matière première crue et précal- cinée, caractéristiques du combustible, teneur en oxygène des gaz d'échappement, etc...The flow rate of the fuel supplying the burner 22 is regulated by a regulator 26, the set value of which is given by a computer 28. This set value is calculated periodically, at very short time intervals (for example 10 seconds), by the computer 28, from the values measured or entered by the operator of a large number of parameters: clinker flow rate, characteristics of the raw and precalcined raw material, characteristics of the fuel, oxygen content of the exhaust gases, etc ...

A chaque pas de calcul, le calculateur détermine d'abord la quantité de chaleur théorique totale qui doit être fournie à l'installation, par unité de temps, au moyen de la formule suivante :

  • QT = QTO x f1 (K1) x f2 (K2) ... fi (Ki) ... fn (Kn).
At each calculation step, the computer first determines the total theoretical amount of heat that must be supplied to the installation, per unit of time, using the following formula:
  • QT = QTO x f1 (K1) x f2 (K2) ... fi (Ki) ... fn (Kn).

Dans cette formule, K1, K2,... Kn, sont des paramètres, tels que le débit de matière première ou de clinker, le taux de décarbonatation de la matière à la sortie de la chambre de précalcination, la teneur en chaux libre du clinker, le taux de cendres du combustible, la proportion de chaque combustible si on utilise plusieurs combustibles, la teneur en oxygène dans les gaz d'échappement du four et de la chambre de précalcination, etc...In this formula, K1, K2, ... Kn, are parameters, such as the flow rate of raw material or of clinker, the rate of decarbonation of the material at the outlet of the precalcination chamber, the free lime content of the clinker, the fuel ash rate, the proportion of each fuel if several fuels are used, the oxygen content in the exhaust gases from the oven and the precalcination chamber, etc.

QTO est la quantité de chaleur théorique totale correspondant aux valeurs nominales imposées des paramètres K1, K2,... Kn. Elle est prédéterminée soit à partir d'essais, soit au moyen d'un modèle mathématique et stockée dans un fichier du calculateur.QTO is the total theoretical heat quantity corresponding to the nominal values imposed by the parameters K1, K2, ... Kn. It is predetermined either from tests or by means of a mathematical model and stored in a computer file.

f1 (K1), f2 (K2) ... fn (Kn) sont des termes correcteurs qui font intervenir les différences entre les valeurs des paramètres K1, K2,... Kn provenant de mesures effectuées à chaque pas de calcul et leurs valeurs nominales. Les relations f1, f2, ... fn sont préétablies et les valeurs nominales des paramètres K1, K2, ... Kn sont stockées dans un fichier du calculateur.f1 (K1), f2 (K2) ... fn (Kn) are corrective terms which involve the differences between the values of the parameters K1, K2, ... Kn coming from measurements carried out at each step of calculation and their values nominal. The relationships f1, f2, ... fn are preset and the nominal values of the parameters K1, K2, ... Kn are stored in a computer file.

Le calculateur détermine ensuite la consommation calorifique de la chambre de précalcination QP. Cette consommation peut être calculée à partir de la mesure du débit de combustible fourni à la chambre de précalcination. Elle peut aussi être calculée au moyen d'une formule analogue à celle servant à calculer QT :

  • QP = OPO x g1 (K1) x g2 (K2) ... gi (Ki) ... gn (Kn).
The computer then determines the heat consumption of the precalcination chamber QP. This consumption can be calculated from the measurement of the fuel flow rate supplied to the precalcination chamber. It can also be calculated using a formula similar to that used to calculate QT:
  • QP = OPO x g1 (K1) x g2 (K2) ... gi (Ki) ... gn (Kn).

La quantité de chaleur nécessaire au four est alors calculée en faisant la différence de QT et de QP, et la valeur obtenue est éventuellement corrigée en fonction de la valeur du signal de sortie d'un régulateur PID incorporé au calculateur et auquel est appliqué un signal provenant de la mesure d'un paramètre représentatif de la qualité du clinker ; ce paramètre peut être, en particulier, la température apparente du clinker à la jetée du four mesurée au moyen d'un pyromètre à rayonnement 30 conformément au procédé faisant l'objet du brevet français 85.03660. A partir de la quantité de chaleur QF ainsi obtenue le calculateur détermine une valeur de consigne FF pour le débit de combustible alimentant le brûleur 22.The amount of heat required for the oven is then calculated by making the difference between QT and QP, and the value obtained is possibly corrected according to the value of the output signal of a PID regulator incorporated in the computer and to which a signal is applied. from the measurement of a parameter representative of the quality of the clinker; this parameter can be, in particular, the apparent temperature of the clinker at the furnace outlet measured by means of a radiation pyrometer 30 in accordance with the process which is the subject of French patent 85.03660. From the quantity of heat QF thus obtained, the computer determines a setpoint value FF for the flow of fuel supplying the burner 22.

Un signal proportionnel à la valeur de consigne calculée FF est distribué au régulateur 26 en fonction du temps, par exemple à travers un filtre ou tout autre moyen de distribution temporelle pour permettre que la modification éventuelle de la valeur de consigne du régulateur soit progressive et s'étale sur une période correspondant approximativement au temps de séjour des matières dans le four.A signal proportional to the calculated setpoint value FF is distributed to the regulator 26 as a function of time, for example through a filter or any other time distribution means to allow the possible modification of the setpoint value of the regulator to be gradual and s spread over a period corresponding approximately to the residence time of the materials in the oven.

La figure 2 montre la variation de la valeur de consigne du régulateur 26. Initialement cette valeur de consigne était FFO. A l'instant t1, la consigne calculée est FF1. A partir de t1 la valeur de consigne du régulateur va croitre progressivement jusqu'à atteindre FF1 au bout d'une période de temps du même ordre de grandeur que le temps de séjour des matières dans le four. On a supposé que la valeur de consigne calculée restait égale à FF1 pendant toute la période considérée. Dans le cas contraire, la courbe serait modifiée pour tenir compte de la nouvelle valeur calculée.Figure 2 shows the variation of the setpoint of regulator 26. Initially this setpoint was FFO. At time t1, the calculated setpoint is FF1. From t1 the regulator setpoint will gradually increase until reaching FF1 after a period of time of the same order of magnitude as the residence time of the materials in the oven. It was assumed that the calculated setpoint remained equal to FF1 throughout the period considered. Otherwise, the curve would be modified to take into account the new calculated value.

Claims (3)

1. Process for controlling a dry process cement manufacturing plant including a precalcining chamber in which the raw material is at least partially de- carbonated and a tubular rotary kiln equipped with a burner at its clinker discharge end and with a controller for the fuel rate fed to the burner, consisting in:
- calculating from a predetermined nominal total quantity of heat (QTO) corresponding to prescribed nominal values of parameters (K1, K2, ... Kn) characteristic of the raw material, fuel, clinker and plant operation, the theoretical total quantity of heat (QT) required of bring the raw material in the state of clinker, by applying to this theoretical nominal total quantity of heat (QTO) correction factors taking into account the differences between the nominal values and the measured values of said parameters,
- calculating the theoretical quantity of heat (QF) which shall be supplied to the kiln by deducting from said theoretical total quantity of heat (QT) the quantity of heat (QP) supplied to the precalcining chamber,
- calculating from said theoretical quantity of heat (QF) to be supplied to the kiln a set point (FF1) for the fuel rate fed to the kiln,
- gradually changing the present set point (FFO) of said controller to bring it to the calculated set point (FF1), the trend of the variations imposed to the set point depending upon the heat treatment conditions of the material and its retention time in the kiln, and
- periodically repeating these operations at near time intervals.
2. Process according to claim 1, characterized in that the quantity of heat (QP) supplied to the precalcining chamber is calculated by means of a predetermined theoretical nominal quantity of heat (QPO) and of correction factors taking into account the differences between the measured values and the nominal values of the computation parameters (K1, K2, ... Kn).
3. Process according to claim 1 or 2, characterized in that the set point for the fuel rate fed to the kiln is corrected depending on the difference between the measured value and the set point of a quantity representative of the clinker quality.
EP87401168A 1986-06-04 1987-05-25 Process for controlling a plant for producing cement by the dry way with precalcination Expired - Lifetime EP0248708B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87401168T ATE49653T1 (en) 1986-06-04 1987-05-25 CONTROL PROCESS FOR A PLANT FOR BURNING CEMENT ACCORDING TO THE DRY PROCESS WITH PRE-CALCINATION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8608032 1986-06-04
FR8608032A FR2599826B1 (en) 1986-06-04 1986-06-04 PROCESS FOR REGULATING A CEMENT-MANUFACTURING PLANT IN A DRY WAY WITH PRE-CALCINATION

Publications (2)

Publication Number Publication Date
EP0248708A1 EP0248708A1 (en) 1987-12-09
EP0248708B1 true EP0248708B1 (en) 1990-01-17

Family

ID=9335979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401168A Expired - Lifetime EP0248708B1 (en) 1986-06-04 1987-05-25 Process for controlling a plant for producing cement by the dry way with precalcination

Country Status (11)

Country Link
US (1) US4817008A (en)
EP (1) EP0248708B1 (en)
JP (1) JPS6340748A (en)
AT (1) ATE49653T1 (en)
BR (1) BR8702812A (en)
CA (1) CA1334296C (en)
DE (1) DE3761462D1 (en)
DK (1) DK165651C (en)
ES (1) ES2012400B3 (en)
FR (1) FR2599826B1 (en)
PT (1) PT85010B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7700707B2 (en) 2002-10-15 2010-04-20 Exxonmobil Chemical Patents Inc. Polyolefin adhesive compositions and articles made therefrom
US8071687B2 (en) 2002-10-15 2011-12-06 Exxonmobil Chemical Patents Inc. Multiple catalyst system for olefin polymerization and polymers produced therefrom

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1052333A (en) * 1963-05-02
FR1463821A (en) * 1965-04-21 1966-07-22 Chichibu Cement Kk Furnace control process
US3566091A (en) * 1966-09-02 1971-02-23 Leeds & Northrup Co Method and apparatus for controlling a process variable by manipulation of a selected one of two variables
US3595544A (en) * 1969-07-15 1971-07-27 United States Steel Corp Control system for cement kiln
US3888621A (en) * 1974-04-12 1975-06-10 Alcan Res & Dev Monitoring and controlling kiln operation in calcination of coke
US4022569A (en) * 1975-12-05 1977-05-10 Alcan Research And Development Limited Calcination of coke
US4430719A (en) * 1981-11-03 1984-02-07 Kaiser Aluminum & Chemical Corporation Calcination control system
FR2557682B1 (en) * 1984-01-03 1986-04-18 Cem Comp Electro Mec METHOD FOR THE AUTOMATED CONDUCT OF A CEMENT CLINKER MANUFACTURING SYSTEM IN A DRY WAY WITH PRE-CALCINATION
JPS6163550A (en) * 1984-09-06 1986-04-01 三菱重工業株式会社 Stabilizing control for cement burning facilities
FR2578834B1 (en) * 1985-03-13 1992-01-03 Fives Cail Babcock METHOD AND DEVICE FOR CONDUCTING A CEMENT CLINKER MANUFACTURING INSTALLATION

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7700707B2 (en) 2002-10-15 2010-04-20 Exxonmobil Chemical Patents Inc. Polyolefin adhesive compositions and articles made therefrom
US8071687B2 (en) 2002-10-15 2011-12-06 Exxonmobil Chemical Patents Inc. Multiple catalyst system for olefin polymerization and polymers produced therefrom
US8088867B2 (en) 2002-10-15 2012-01-03 Exxonmobil Chemical Patents Inc. Multiple catalyst system for olefin polymerization and polymers produced therefrom
US8957159B2 (en) 2002-10-15 2015-02-17 Exxonmobil Chemical Patents Inc. Multiple catalyst system for olefin polymerization and polymers produced therefrom

Also Published As

Publication number Publication date
DE3761462D1 (en) 1990-02-22
FR2599826B1 (en) 1989-08-25
ES2012400B3 (en) 1990-03-16
DK291887D0 (en) 1987-06-04
PT85010B (en) 1990-07-31
EP0248708A1 (en) 1987-12-09
DK165651B (en) 1992-12-28
ATE49653T1 (en) 1990-02-15
FR2599826A1 (en) 1987-12-11
US4817008A (en) 1989-03-28
DK291887A (en) 1987-12-05
BR8702812A (en) 1988-03-01
CA1334296C (en) 1995-02-07
JPS6340748A (en) 1988-02-22
DK165651C (en) 1993-06-01
PT85010A (en) 1987-07-01

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