EP0291631A2 - Tunnel kiln for burning light bricks containing a high percentage of combustible and volatile components - Google Patents

Tunnel kiln for burning light bricks containing a high percentage of combustible and volatile components Download PDF

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Publication number
EP0291631A2
EP0291631A2 EP88101735A EP88101735A EP0291631A2 EP 0291631 A2 EP0291631 A2 EP 0291631A2 EP 88101735 A EP88101735 A EP 88101735A EP 88101735 A EP88101735 A EP 88101735A EP 0291631 A2 EP0291631 A2 EP 0291631A2
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EP
European Patent Office
Prior art keywords
gases
chamber
volatile components
circulating
degassing
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.)
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Application number
EP88101735A
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German (de)
French (fr)
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EP0291631B1 (en
EP0291631A3 (en
Inventor
Hans Lingl
Otto Unterfrauner
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Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
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Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
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Priority to AT88101735T priority Critical patent/ATE77688T1/en
Publication of EP0291631A2 publication Critical patent/EP0291631A2/en
Publication of EP0291631A3 publication Critical patent/EP0291631A3/en
Application granted granted Critical
Publication of EP0291631B1 publication Critical patent/EP0291631B1/en
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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
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005—Details, accessories, or equipment peculiar to 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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor

Definitions

  • the invention relates to a tunnel furnace according to the preamble of claim 1.
  • a degassing chamber separated by gates is provided as the degassing zone between the combustion chamber and the preheating chamber.
  • the heating of these takes place indirectly through heat exchange surfaces which are heated by the exhaust gases from the furnace.
  • the degassing chamber has a gas circulation circuit. This mainly promotes lean gas, which arises from the volatile constituents of the raw material in the moldings. This lean gas is supplied from the degassing chamber either to the high-temperature zone of the combustion chamber for post-combustion or to an external device as a heating medium.
  • the invention has for its object to heat the firing material to 4oo ° C in the preheating chamber of the tunnel furnace and rid of harmful smoldering products.
  • the initial temperature of the smoldering process is not critical and the final temperature of the preheating can be set high enough to reliably detect all harmful gases, so that no smoldering products can get into the exhaust gases. 1oo% of the carbonization gases go through the afterburning device. There is also no separate degassing chamber, which also reduces the number of gates, the maintenance of which is problematic because of the high temperatures.
  • the drawing shows a schematic longitudinal section through the tunnel furnace with preheating chamber and combustion chamber.
  • a gas circulation circuit extends along the preheating chamber 3 and promotes gas generated from the volatile constituents of the fuel in the moldings by means of a fan 4.
  • the gas is withdrawn from suction openings 5 in the vicinity of the chamber entrance 6 and fed back into the combustion chamber 1 in front of the entrance gate 2.
  • an inlet 7 is provided for the supply of fresh air.
  • a first heating stage consisting of a heat exchanger, is connected in the circulation direction behind the fan 4, in which the circulation gases are preheated in exchange with the exhaust gas flow (flue gases) from the tunnel oven.
  • a branch is provided through which part of the gas (carbonization gas) is discharged and passed through a post-combustion device 9 and a further heat exchanger 10, to which the flue gas stream from the combustion chamber 1 of the tunnel furnace is admixed.
  • the further heat exchanger serves as the second heating stage of the circulating gases.
  • the fired material in the preheating chamber is heated exothermically in the range from 25o ° C to 4oo ° C.
  • the temperature of the circulating gases is increased as a result of the two-stage heating by the heat exchangers 8 and 10 to over 400 ° C., so that the continuity of the process in the preheating chamber 3 is ensured.

Abstract

A tunnel furnace is described, with preheating chamber and combustion chamber which are separated from one another by a gate, and with a degassing zone, consisting of a gas circulating circuit, heated indirectly by the smoke gases, for degassing the combustible volatile components and a combustion device for the outgassed volatile components. In this connection, the degassing zone is assigned to the preheating chamber (3), the gases being removed from suction openings (5) in the vicinity of the chamber entrance (6) by means of a fan (4) and fed back in again in front of the gate (2) to the combustion chamber (1). Also connected in this circulating circuit are two heating stages (8, 10), there being provided after the first heating stage (8) a branch for a part of the circulating gases, which opens into the pipe of the smoke gases carried off, in which branch the post-combustion device (9) and subsequently a heat exchanger, which serves as second heating stage (10) for the circulating gases, are connected. <IMAGE>

Description

Die Erfindung betrifft einen Tunnelofen nach dem Oberbegriff des Anspruches 1.The invention relates to a tunnel furnace according to the preamble of claim 1.

Bei einem bekannten Tunnelofen dieser Art sollen keine unver­brannten brennbaren Bestandteile, die die Umwelt belasten, aus dem Kamin austreten, vielmehr sollen die austretenden Rauchgase weitgehend frei von Schwelgasen und geruchsbelästi­genden Stoffen sein.In a known tunnel kiln of this type, no unburned combustible constituents which pollute the environment should emerge from the chimney, but rather the escaping flue gases should be largely free of smoldering gases and odorous substances.

Als Entgasungszone ist zwischen der Brennkammer und der Vor­wärmkammer eine durch Tore abgetrennte Entgasungskammer vor­gesehen. Die Beheizung derselben erfolgt indirekt durch Wärme­austauschflächen, die von den Abgasen des Ofens beheizt wer­den.A degassing chamber separated by gates is provided as the degassing zone between the combustion chamber and the preheating chamber. The heating of these takes place indirectly through heat exchange surfaces which are heated by the exhaust gases from the furnace.

Die Entgasungskammer weist einen Gasumwälzkreis auf. Dieser fördert vorwiegend Schwachgas, das aus den flüchtigen Bestand­teilen des Rohstoffes in den Formlingen entsteht. Dieses Schwachgas wird von der Entgasungskammer entweder der Hoch­temperaturzone der Brennkammer zur Nachverbrennung oder einer externen Einrichtung als Heizmittel zugeführt.The degassing chamber has a gas circulation circuit. This mainly promotes lean gas, which arises from the volatile constituents of the raw material in the moldings. This lean gas is supplied from the degassing chamber either to the high-temperature zone of the combustion chamber for post-combustion or to an external device as a heating medium.

Im niederen Temperaturbereich liegt wegen des Restwasser­gehalts der Ziegel endothermes Verhalten vor, weshalb zur Vorwärmung eine größere Temperaturdifferenz zwischen Gasen und Ziegeln erforderlich ist, was zu einer früher einsetzen­den Entgasung an der Oberfläche der Ziegel führen kann. Auch bereitet die Temperaturregelung im Übergang vom Vorwärmer zur Entgasungskammer Schwierigkeiten.In the lower temperature range there is endothermic behavior due to the residual water content of the bricks, which is why a greater temperature difference between gases and bricks is required for preheating, which can lead to earlier degassing on the surface of the bricks. Temperature control in the transition from the preheater to the degassing chamber also presents difficulties.

Der Erfindung liegt die Aufgabe zugrunde, in der Vorwärmkam­mer des Tunnelofens das Brenngut bis auf 4oo°C zu erwärmen und dabei von schädlichen Schwelprodukten zu befreien.The invention has for its object to heat the firing material to 4oo ° C in the preheating chamber of the tunnel furnace and rid of harmful smoldering products.

Diese Aufgabe wird mit den im Anspruch 1 gekennzeichneten Merkmalen gelöst.This object is achieved with the features characterized in claim 1.

Bei dem erfindungsgemäßen Tunnelofen ist die Anfangstempera­tur des Schwelprozesses nicht kritisch und die Endtemperatur der Vorwärmung kann hoch genug angesetzt werden, um alle schädlichen Gase sicher zu erfassen, so daß keine Schwelpro­dukte in die Abgase gelangen können. 1oo % der Schwelgase gehen über die Nachverbrennungsvorrichtung. Ferner entfällt eine abgetrennte Entgasungskammer, womit sich auch die Anzahl der Tore vermindert, deren Wartung wegen der hohen Tempera­turen ohnehin problematisch ist.In the tunnel furnace according to the invention, the initial temperature of the smoldering process is not critical and the final temperature of the preheating can be set high enough to reliably detect all harmful gases, so that no smoldering products can get into the exhaust gases. 1oo% of the carbonization gases go through the afterburning device. There is also no separate degassing chamber, which also reduces the number of gates, the maintenance of which is problematic because of the high temperatures.

Die Zeichnung zeigt einen schematischen Längsschnitt durch den Tunnelofen mit Vorwärmkammer und Brennkammer.The drawing shows a schematic longitudinal section through the tunnel furnace with preheating chamber and combustion chamber.

Längs der Vorwärmkammer 3 erstreckt sich ein Gas-Umwälz-Kreis, welcher aus den flüchtigen Bestandteilen des Brennstoffes in den Formlingen entstehendes Gas mittels eines Ventilators 4 fördert. Das Gas wird an Absaugöffnungen 5 in der Nähe der Kammereinfahrt 6 entnommen und vor dem Einfahrtor 2 der Brenn­kammer 1 wieder eingespeist. Vor dem Ventilator 4 ist ein Einlaß 7 für die Zufuhr von Frischluft vorgesehen. In Umwälz­richtung hinter dem Ventilator 4 ist eine erste Aufheizstufe, bestehend aus einem Wärmeaustauscher, geschaltet, in der die Umwälzgase im Austausch mit dem Abgasstrom (Rauchgase) des Tunnelofens vorgewärmt werden. Anschließend an die erste Auf­heizstufe ist eine Abzweigung vorgesehen, durch die ein Teil des Gases (Schwelgas) abgeführt und durch eine Nachverbren­nungsvorrichtung 9 sowie einen weiteren Wärmeaustauscher 1o geleitet, dem Rauchgasstrom aus der Brennkammer 1 des Tunnel­ofens beigemischt wird. Der weitere Wärmeaustauscher dient als zweite Aufheizstufe der Umwälzgase.A gas circulation circuit extends along the preheating chamber 3 and promotes gas generated from the volatile constituents of the fuel in the moldings by means of a fan 4. The gas is withdrawn from suction openings 5 in the vicinity of the chamber entrance 6 and fed back into the combustion chamber 1 in front of the entrance gate 2. In front of the fan 4, an inlet 7 is provided for the supply of fresh air. A first heating stage, consisting of a heat exchanger, is connected in the circulation direction behind the fan 4, in which the circulation gases are preheated in exchange with the exhaust gas flow (flue gases) from the tunnel oven. Following the first heating stage, a branch is provided through which part of the gas (carbonization gas) is discharged and passed through a post-combustion device 9 and a further heat exchanger 10, to which the flue gas stream from the combustion chamber 1 of the tunnel furnace is admixed. The further heat exchanger serves as the second heating stage of the circulating gases.

Die Aufheizung des Brenngutes in der Vorwärmkammer erfolgt im Bereich von 25o°C bis 4oo°C exotherm. Die Temperatur der Umwälzgase wird infolge der zweistufigen Aufheizung durch die Wärmeaustauscher 8 und 1o auf über 4oo°C angehoben, so daß die Kontinuität des Vorgangs in der Vorwärmkammer 3 ge­sichert ist.The fired material in the preheating chamber is heated exothermically in the range from 25o ° C to 4oo ° C. The temperature of the circulating gases is increased as a result of the two-stage heating by the heat exchangers 8 and 10 to over 400 ° C., so that the continuity of the process in the preheating chamber 3 is ensured.

Claims (3)

1. Tunnelofen mit durch ein Tor voneinander getrennter Vorwärmkammer und Brennkammer sowie mit einer Ent­gasungszone, bestehend aus einem von den Rauchgasen indirekt beheizten Gas-Umwälzkreis zum Entgasen der brennbaren flüchtigen Bestandteile und einer Verbrennungs­vorrichtung für die ausgegasten flüchtigen Bestandteile, dadurch gekennzeichnet, daß die Entgasungszone der Vor­wärmkammer (3) zugeordnet ist, wobei die Gase aus Ansaugöffnungen (5) in der Nähe der Kammereinfahrt (6) mittels eines Ventilators (4) entnommen und vor dem Tor (2) zur Brennkammer (1) wieder eingespeist werden, daß ferner in diesen Umwälzkreis zwei Aufheizstufen (8 und 10) geschaltet sind und daß hinter der ersten Aufheizstufe (8) eine in die Leitung der abgeführten Rauchgase mündende Abzweigung für einen Teil der Um­wälzgase vorgesehen ist, in welcher Abzweigung die Nachverbrennungsvorrichtung (9) und nachfolgend ein als zweite Aufheizstufe (10) für die Umwälzgase dienender Wärmeaustauscher geschaltet ist.1. tunnel furnace with a preheating chamber and combustion chamber separated from each other and with a degassing zone consisting of a gas circulation circuit indirectly heated by the flue gases for degassing the combustible volatile components and a combustion device for the degassed volatile components, characterized in that the degassing zone of the Preheating chamber (3) is assigned, the gases being removed from suction openings (5) near the chamber entrance (6) by means of a fan (4) and fed back to the combustion chamber (1) in front of the gate (2), furthermore in this Circulation circuit two heating stages (8 and 10) are connected and that behind the first heating stage (8) a branch leading into the line of the flue gases is provided for part of the circulating gases, in which branch the post-combustion device (9) and subsequently a second heating stage (10) for the circulating gases serving heat exchanger. 2. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die erste Aufheizstufe (8) ein Wärmeaustauscher ist, der von den abgeführten Rauchgasen beheizt wird.2. Plant according to claim 1, characterized in that the first heating stage (8) is a heat exchanger which is heated by the exhaust gases. 3. Anlage nach Anspruch 1, dadurch gekennzeichnet, daß vor dem Ventilator (4) ein Einlaß (7) für Frischluftzufuhr in die Umwälzgase vorgesehen ist.3. Plant according to claim 1, characterized in that an inlet (7) for fresh air supply in the circulating gases is provided in front of the fan (4).
EP88101735A 1987-05-22 1988-02-06 Tunnel kiln for burning light bricks containing a high percentage of combustible and volatile components Expired - Lifetime EP0291631B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88101735T ATE77688T1 (en) 1987-05-22 1988-02-06 TUNNEL KILN FOR FIRING LIGHT BRICKS WITH A HIGH PROPORTION OF COMBUSTIBLE AND GASABLE COMPONENTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3717320 1987-05-22
DE3717320A DE3717320C1 (en) 1987-05-22 1987-05-22 Tunnel kiln for burning light bricks with a high proportion of combustible and gasifiable components

Publications (3)

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EP0291631A2 true EP0291631A2 (en) 1988-11-23
EP0291631A3 EP0291631A3 (en) 1990-03-21
EP0291631B1 EP0291631B1 (en) 1992-06-24

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EP88101735A Expired - Lifetime EP0291631B1 (en) 1987-05-22 1988-02-06 Tunnel kiln for burning light bricks containing a high percentage of combustible and volatile components

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EP (1) EP0291631B1 (en)
AT (1) ATE77688T1 (en)
DE (1) DE3717320C1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923887A1 (en) * 1989-07-19 1991-01-24 Manfred Leisenberg Kg Tunnel furnace for firing ceramics - with decomposition toxic gases withdrawn and reheated to ensure complete burning before being exhausted to atmos.
WO2014184455A1 (en) * 2013-05-16 2014-11-20 Cleia Plant for firing ceramic products

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831558A1 (en) * 1988-09-16 1990-04-05 Munzert Karl Heinz Method and continuous furnace for the removal of pollutants from exhaust gases
DE3908758C1 (en) * 1989-03-17 1990-04-19 Hans Lingl Anlagenbau Und Verfahrenstechnik Gmbh & Co Kg, 7910 Neu-Ulm, De Tunnel furnace for baking light bricks
DE4233916A1 (en) * 1992-10-08 1994-04-28 Gautschi Electro Fours Sa Industrial heat treatment furnace - returns portion of recirculating gas into treatment zone through jets across main gas flow
DE4344214A1 (en) * 1993-12-23 1995-06-29 Innovatherm Prof Dr Leisenberg Gmbh & Co Kg Tunnel kiln
DE102011119436B4 (en) * 2011-11-25 2020-08-06 Eisenmann Se Device for tempering objects
DE102013010885A1 (en) * 2013-07-01 2015-01-22 Eisenmann Ag Process for sintering sintered workpieces and installation therefor
DE102016001893A1 (en) 2016-02-17 2017-08-17 Eisenmann Se Burner unit and device for tempering objects
CN108826968A (en) * 2018-07-05 2018-11-16 力华智能设备科技（东莞）有限公司 A kind of induction heating continuous tunnel furnace

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE278184C (en) *
US4140467A (en) * 1975-06-09 1979-02-20 Kenneth Ellison Convection oven and method of drying solvents
US4460331A (en) * 1983-05-12 1984-07-17 Haden Schweitzer Corporation Fume incineration for paint drying oven
DE3516058A1 (en) * 1984-08-21 1986-03-06 Institut für Ziegelforschung Essen e.V., 4300 Essen Tunnel furnace for baking green ceramic products and method for operating such a tunnel furnace

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060680A (en) * 1975-04-10 1977-11-29 Imperial Chemical Industries Limited Production of acrylonitrile copolymers
DE3014905B1 (en) * 1980-04-18 1981-02-19 Keller Ofenbau Gmbh Process and tunnel kiln for firing ceramic moldings containing fuel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE278184C (en) *
US4140467A (en) * 1975-06-09 1979-02-20 Kenneth Ellison Convection oven and method of drying solvents
US4460331A (en) * 1983-05-12 1984-07-17 Haden Schweitzer Corporation Fume incineration for paint drying oven
DE3516058A1 (en) * 1984-08-21 1986-03-06 Institut für Ziegelforschung Essen e.V., 4300 Essen Tunnel furnace for baking green ceramic products and method for operating such a tunnel furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923887A1 (en) * 1989-07-19 1991-01-24 Manfred Leisenberg Kg Tunnel furnace for firing ceramics - with decomposition toxic gases withdrawn and reheated to ensure complete burning before being exhausted to atmos.
WO2014184455A1 (en) * 2013-05-16 2014-11-20 Cleia Plant for firing ceramic products
FR3005723A1 (en) * 2013-05-16 2014-11-21 Cleia COOKING INSTALLATION OF CERAMIC PRODUCTS

Also Published As

Publication number Publication date
EP0291631B1 (en) 1992-06-24
DE3717320C1 (en) 1988-07-14
EP0291631A3 (en) 1990-03-21
ATE77688T1 (en) 1992-07-15

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