EP0348603B1 - Regelsystem für einen im Gegenstrom betriebenen Tunnelofen - Google Patents

Regelsystem für einen im Gegenstrom betriebenen Tunnelofen Download PDF

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Publication number
EP0348603B1
EP0348603B1 EP89105526A EP89105526A EP0348603B1 EP 0348603 B1 EP0348603 B1 EP 0348603B1 EP 89105526 A EP89105526 A EP 89105526A EP 89105526 A EP89105526 A EP 89105526A EP 0348603 B1 EP0348603 B1 EP 0348603B1
Authority
EP
European Patent Office
Prior art keywords
temperature
zone
regulated
cooling
pressure
Prior art date
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
Application number
EP89105526A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0348603A3 (de
EP0348603A2 (de
Inventor
Johann Joas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
Original Assignee
Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG filed Critical Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
Publication of EP0348603A2 publication Critical patent/EP0348603A2/de
Publication of EP0348603A3 publication Critical patent/EP0348603A3/de
Application granted granted Critical
Publication of EP0348603B1 publication Critical patent/EP0348603B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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 specially adapted for furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • F27B2009/124—Cooling
    • 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 specially adapted for furnaces of these types
    • F27B9/3005—Details, accessories or equipment specially adapted for furnaces of these types arrangements for circulating gases
    • 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
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F27D2019/0018—Monitoring the temperature of the atmosphere of the kiln
    • 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
    • F27D2019/0031—Regulation through control of the flow of the exhaust gases

Definitions

  • the invention relates to a method for controlling a tunnel kiln operated in countercurrent, preferably in the ceramic industry, according to the internal known prior art, which forms the preamble of claim 1.
  • the heating curve can be adapted relatively easily to the fluctuations in the mass flow of the firing material; however, it is difficult to optimally set the cooling curve at the same time. It was therefore necessary to develop a control system to optimize the cooling curve.
  • Tunnel furnaces are operated in countercurrent and consist of a heating zone with a flue gas outlet at the beginning and burners at the end, a combustion zone with differently divided burner groups, as well as a cooling zone, usually with rapid cooling at the beginning, with the cold air is fed directly into the furnace in order to bring about a faster drop in temperature, subsequently - as a rule - with one or more direct extraction systems, with which air is extracted from the cooling zone, in order to control the shape of the cooling curve by changing the mass flow, and from a supply air fan on the exit side of the cooling zone, with which the differential mass resulting from the air mass balance of the furnace is fed into the furnace.
  • the amount of smoke gas to be extracted in older ovens is usually via the negative pressure in the heating zone certainly.
  • the amount of flue gas to be extracted in the heating zone of the furnace is usually regulated via the temperature at a point in the heating zone of the furnace, which is established there by the ratio of the heat capacity flows of fuel and air, or via the flue gas temperature.
  • the temperature curve in the heating zone is kept constant despite different mass flows of firing material.
  • this has the consequence that the mass flow in the cooling zone is constantly changing and, at least in the region up to the first direct extraction in the direction of advance of the combustion material, cannot be influenced by the known means.
  • An increase in the capacity of the rapid cooling would only lead to the temperature curve in this area becoming too flat or even rising again due to the associated reduction in the quantity of cooling air in the subsequent cooling zone, which can lead to considerable disadvantages for the quality of the ceramic product to be cooled .
  • With the subsequent direct extraction only the cooling section behind it can be influenced, but not the critical area between rapid cooling and the first direct extraction.
  • the object of the invention is therefore to provide a control system which makes it possible to influence the mass flow in the furnace in such a way that the temperature gradient is kept within the limits required for the combustion quality.
  • This control system which depends on the maximum and minimum temperature gradients in the heating zone an optimization of the temperature gradient in the critical area of the cooling zone enables, at the same time, a better recuperation of the heat capacity of the mass flow of fuel in the cooling zone and thus a lower heat requirement of the furnace.
  • Another advantage of the invention is that a noticeable energy saving can be achieved.
  • the kiln 2 is pushed from the entrance 3 to the exit 4 through the tunnel furnace 1 with heating zone A, combustion zone B and cooling zone C, while the furnace gases are drawn in countercurrent from the exit side 4 of the furnace to the flue gas extractor 5, near the entrance 3.
  • the output of the flue gas fan 6 is constantly regulated via the negative pressure which is measured at any point in the heating zone A.
  • maximum / minimum temperature limit values detected by thermocouples are provided at any point in the heating zone A or in the flue gas outlet 5, which serve as reference variables when the temperature limit values are reached.
  • the burners 7 in the combustion zone B and the rapid cooling 8 at the beginning of the cooling zone C are regulated in a known manner depending on the temperature.
  • the performance of the first direct suction 9 and a further direct suction 10 is also known Constantly controlled via a temperature in the direction of the firing material mass flow after the direct suction 9, 10.
  • the output of the supply air fan 11 is constantly regulated via the pressure at any point in the cooling zone, which can be, for example, between the rapid cooling 8 and the first direct extraction 9.
  • maximum-minimum temperature limit values detected by thermocouples are provided as a further control variable at a point between rapid cooling 8 and first direct suction 9. If the upper temperature limit is exceeded, this triggers an incremental increase in the pressure setpoint of the supply air fan 11 by an adjustable amount. If the temperature falls below the lower limit, this gradually lowers the pressure setpoint of the supply air fan by an adjustable amount. Maximum and minimum pressure are limited.
  • the pressure drop in the furnace is increased or decreased and thus adapted to the mass flow in the critical area of the cooling zone so that the cooling curve in this area does not exceed a certain temperature gradient. or falls below.
  • the pressure control in the heating zone A will attempt to compensate for the higher pressure drop by increasing the speed of the flue gas fan 6, so that, as desired, the air mass flow is increased until the upper temperature limit in the heating zone is reached, which thus limits the entire adaptation process upwards; the same - vice versa - is the case when the pressure level in the cooling zone is reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Control Of Temperature (AREA)
EP89105526A 1988-06-29 1989-03-29 Regelsystem für einen im Gegenstrom betriebenen Tunnelofen Expired - Lifetime EP0348603B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3821858A DE3821858C1 (enExample) 1988-06-29 1988-06-29
DE3821858 1988-06-29

Publications (3)

Publication Number Publication Date
EP0348603A2 EP0348603A2 (de) 1990-01-03
EP0348603A3 EP0348603A3 (de) 1992-01-02
EP0348603B1 true EP0348603B1 (de) 1994-06-01

Family

ID=6357475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89105526A Expired - Lifetime EP0348603B1 (de) 1988-06-29 1989-03-29 Regelsystem für einen im Gegenstrom betriebenen Tunnelofen

Country Status (3)

Country Link
EP (1) EP0348603B1 (enExample)
AT (1) ATE106538T1 (enExample)
DE (2) DE3821858C1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4434780C1 (de) * 1994-09-29 1995-10-19 Riedhammer Gmbh Co Kg Einrichtung zur Regelung des Gasdrucks in benachbarten Zonen eines Durchlaufofens

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423221A1 (de) * 1994-07-01 1996-01-04 Lingl Anlagenbau Wärmeübergang im Tunnelofen
NL1000909C1 (nl) * 1995-08-01 1995-11-10 Flynn Controls B V Temperatuurregelaar voor een tunneloven.
ITRE20060007A1 (it) * 2006-01-26 2007-07-27 Sacmi Forni Spa Metodo e apparecchiatura per la gestione ottimizzata di un forno di cottura per piastrelle ceramiche.
CN105202912A (zh) * 2015-10-23 2015-12-30 青岛铸英特陶科技有限公司 燃气辊道窑炉

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142884A (en) * 1961-10-19 1964-08-04 Pullman Inc Method and apparatus for controlling the cooling zone of a tunnel kiln
DE1303473C2 (de) * 1966-04-06 1974-01-17 Keller Ofenbau Gmbh, 4533 Laggenbeck Verfahren zum kontinuierlichen brennen von keramischem einsatzgut in tunneloefen und tunnelofen zur durchfuehrung des verfahrens
DE2357057B2 (de) * 1973-11-15 1976-12-30 Leisenberg, Manfred, 6312 Laubach Verfahren und vorrichtung zur luftmengenregelung in einem tunnelofen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4434780C1 (de) * 1994-09-29 1995-10-19 Riedhammer Gmbh Co Kg Einrichtung zur Regelung des Gasdrucks in benachbarten Zonen eines Durchlaufofens

Also Published As

Publication number Publication date
EP0348603A3 (de) 1992-01-02
ATE106538T1 (de) 1994-06-15
DE58907741D1 (de) 1994-07-07
DE3821858C1 (enExample) 1989-11-23
EP0348603A2 (de) 1990-01-03

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