EP0198219B1 - Procédé d'un réglage adapté des débits d'air dans un four tunnel - Google Patents

Procédé d'un réglage adapté des débits d'air dans un four tunnel Download PDF

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Publication number
EP0198219B1
EP0198219B1 EP86103248A EP86103248A EP0198219B1 EP 0198219 B1 EP0198219 B1 EP 0198219B1 EP 86103248 A EP86103248 A EP 86103248A EP 86103248 A EP86103248 A EP 86103248A EP 0198219 B1 EP0198219 B1 EP 0198219B1
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EP
European Patent Office
Prior art keywords
zone
values
batch
type
value
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP86103248A
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German (de)
English (en)
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EP0198219A2 (fr
EP0198219A3 (en
Inventor
Wolfgang Dr.-Ing. Leisenberg
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Individual
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Classifications

    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/12—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation
    • F27D2019/0068—Regulation involving a measured inflow of a particular gas in the enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2001/00—Composition, conformation or state of the charge
    • F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
    • F27M2001/1504—Ceramic articles

Definitions

  • the invention relates to a method for adapting the air flows in the heating zone and / or the cooling zone of a tunnel kiln in the ceramic industry with changing stock.
  • German patent application DE-A-34 38 347 discloses a method for adapting a tunnel furnace to different outputs and firing curves.
  • two or more setpoints of the tunnel kiln are determined for different kiln capacities and stored in a process computer, in which the target values valid for all other capacities are determined by regression and the material flows are controlled by regulators depending on the output promoted.
  • This control procedure has proven itself, an adjustment the air volume flows in the heating and / or cooling zone with changing stocking is not possible with this control method.
  • the object of the invention is therefore to provide a control method by means of which a satisfactory adaptation of the air flow rates in the heating zone and / or the cooling zone of a tunnel oven can be achieved in the short term even with changing stocking.
  • this is achieved in that, in order to change the setpoint values for the temperature in the zone to be controlled, a first setpoint value assigned to the first type of stocking is added with a component which is assessed by a factor and which is derived from the difference between the first setpoint value and the second results in the setpoint assigned to the following type of stocking, the setpoints being determined empirically.
  • the weighting is expediently carried out in the ratio of the kiln cars with the different products, it being indicated that the factor corresponds to the ratio of the number of kiln cars carrying the set or an empirical value from the first and second type of set within the zone to be regulated.
  • the difference between the old and the new setpoint is thus initially formed and this is added to the old setpoint by a factor.
  • the factor is zero, as long as there is no carriage of the new type of trim in the zone concerned, it then increases linearly with the proportion of the new type of trim, i.e. it has the value 0.5 if half of the trims are older and new trim is in the zone to be controlled and finally reaches the value 1 corresponding to the new setpoint when the entire zone is filled with the new trim type.
  • the method can be refined in such a way that the temperature is not only measured at one point in the zone to be controlled, as is usually the case, but that the temperature is determined in this zone by means of a plurality of temperature sensors arranged at different points, and that the temperature average of this Zone forms the actual value of a control circuit guided by a process computer, which is opposed by a predetermined setpoint.
  • the limit value is entered into the control loop as the setpoint value and the measured value as the actual value, the limit values of a zone depending on the power and / or the type of stocking can be changed.
  • the control loop can thus receive the mean value of all temperature sensors as the actual value and the mean value of all setpoint temperatures as setpoint for setting the air volume. This ensures that changes in the temperature level are detected earlier and the controller can intervene more quickly.
  • the feed-back strategy can be subordinated to a feed-forward strategy.
  • this requires that all disturbance and influencing variables are known quantitatively. Similar to the mathematical oven models, this means an extraordinarily large amount of identification. Methods are known here in which this identification is carried out on-line via a computer which constantly adapts the furnace model to reality. In addition to a considerable amount of software and hardware, a large number of additional sensors are required for this, which overall make the process not very practical.
  • the process controller of the control loop is given a priori information about the weight of the type of stocking to be introduced into the zone to be controlled, this information can be used to generate a correction signal for the manipulated variable, so that not only the setpoints have to be corrected, but it Corrections of the manipulated variable can also be carried out, which ideally make the intervention of the controller superfluous, but in practice considerably reduce it.
  • this is done through a self-learning process.
  • the process computer obtains a correction value from each product type and push speed actually driven on the basis of the superimposed relation, the correction signal should be provided with a weighted factor which corresponds in whole or in part to the factor assigned to the target values. If there is only one correction value for the next control process, but the thrust speed is different, the process computer first uses this correction value, but gains another one after the process is completed, so that it already has the basis for an interpolation for the next process.
  • Regression functions are therefore provided for correction, which are formed from manipulated variables set by the control circuit during operation.
  • the database for the regression functions should not be weighted equally, but more recent measurements should be given greater weight. This results in a regression with time constant characteristics, which allows continuous adaptation to changing boundary conditions in the tunnel kiln.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feedback Control In General (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Tunnel Furnaces (AREA)

Claims (11)

  1. Procédé pour la régulation de la quantité d'air dans la zone de réchauffement et/ou de refroidissement d'un four tunnel de l'industrie céramique, dans le cas de charges diverses,
    se caractérisant par le fait que
    pour le changement des valeurs nominales de la température dans la zone à régler, il est ajouté à la première valeur nominale, qui est attribuée au genre de chargement, une part déterminée par un facteur et qui résulte de la différence entre la première valeur nominale et la deuxième, attribuée, elle, au genre de chargement suivant, les valeurs nominales étant obtenues par le procédé empirique.
  2. Procédé d'après la revendication 1,
    se caractérisant par le fait que
    le facteur correspond au rapport du nombre des chariots d'enfournement ou à une valeur empirique relevant du premier ou du deuxième chargement à l'intérieur de la zone à régler.
  3. Procédé d'après la revendication 1 ou 2,
    se caractérisant par le fait que
    dans la zone à régler, la température est mesurée à l'aide de plusieurs palpeurs montés à des endroits différents et que la température moyenne dans cette zone forme la valeur effective d'une boucle d'asservissement commandée par calculateur à laquelle s'oppose une valeur nominale prédéterminée.
  4. Procédé d'après une ou plusieurs des revendications 1 à 3,
    se caractérisant par le fait que
    les valeurs mesurées d'une zone sont définies par des valeurs limites supérieure et inférieure et que, du moment qu'une de ces limites est dépassée, la valeur limite entre en tant que valeur nominale et la valeur mesurée en tant que valeur effective dans la boucle.
  5. Procédé d'après la revendication 4,
    se caractérisant par le fait que
    les valeurs limites d'une zone sont modifiées en fonction de la puissance et/ou du genre de chargement.
  6. Procédé d'après la revendication 4 ou 5,
    se caractérisant par le fait que
    les valeurs limites d'une zone sont écartées à tel point que deux valeurs limites opposées ne peuvent pas devenir simultanément actives.
  7. Procédé d'après la revendication 5 ou 6,
    se caractérisant par le fait que
    la priorité se trouve sur les points de mesure des seuils de température critiques, tel que p. ex. le point de transition du quartz.
  8. Procédé d'après une ou plusieurs des revendications 1 à 7,
    se caractérisant par le fait que
    le calculateur de la boucle d'asservissement reçoit d'emblée une information sur le poids du chargement à entrer dans la zone à régler et qu'à l'aide de cette information, le calculateur forme un signal de correction pour le paramètre de réglage.
  9. Procédé d'après la revendication 8,
    se caractérisant par le fait que
    le signal de correction est munie d'un facteur pondéré correspondant entièrement ou partiellement au facteur attribué aux valeurs nominales.
  10. Procédé d'après une ou plusieurs des revendications 1 à 9,
    se caractérisant par le fait que
    la correction est effectuée à l'aide de fonctions de régression formées par les paramètres de réglage déterminés en service par la boucle d'asservissement.
  11. Procédé d'après la revendication 10,
    se caractérisant par le fait que
    les valeurs utilisées comme dates fondamentales pour les fonctions de régression sont gérées de sorte que la priorité revienne aux dernières valeurs.
EP86103248A 1985-04-06 1986-03-11 Procédé d'un réglage adapté des débits d'air dans un four tunnel Expired - Lifetime EP0198219B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3512499 1985-04-06
DE19853512499 DE3512499A1 (de) 1985-04-06 1985-04-06 Verfahren zur anpassung der luftmengenstroeme eines tunnelofens

Publications (3)

Publication Number Publication Date
EP0198219A2 EP0198219A2 (fr) 1986-10-22
EP0198219A3 EP0198219A3 (en) 1989-04-12
EP0198219B1 true EP0198219B1 (fr) 1991-06-26

Family

ID=6267399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103248A Expired - Lifetime EP0198219B1 (fr) 1985-04-06 1986-03-11 Procédé d'un réglage adapté des débits d'air dans un four tunnel

Country Status (2)

Country Link
EP (1) EP0198219B1 (fr)
DE (2) DE3512499A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026215B (de) * 1954-04-30 1958-03-13 Keramische Ind Bedarfs Kom Ges Regler fuer Tunneloefen
DE2357057B2 (de) * 1973-11-15 1976-12-30 Leisenberg, Manfred, 6312 Laubach Verfahren und vorrichtung zur luftmengenregelung in einem tunnelofen
DD204755A1 (de) * 1981-10-21 1983-12-07 Keramik Wtb Veb Verfahren und anordnung zur vorausoptimierung von stoergroessen

Also Published As

Publication number Publication date
EP0198219A2 (fr) 1986-10-22
DE3679929D1 (de) 1991-08-01
DE3512499A1 (de) 1986-10-09
EP0198219A3 (en) 1989-04-12

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