DE2657829A1 - Tunnel furnace with preheat zone - has reversible fan to recirculate hot gases in the preheat zone for uniform temps. - Google Patents

Tunnel furnace with preheat zone - has reversible fan to recirculate hot gases in the preheat zone for uniform temps.

Info

Publication number
DE2657829A1
DE2657829A1 DE19762657829 DE2657829A DE2657829A1 DE 2657829 A1 DE2657829 A1 DE 2657829A1 DE 19762657829 DE19762657829 DE 19762657829 DE 2657829 A DE2657829 A DE 2657829A DE 2657829 A1 DE2657829 A1 DE 2657829A1
Authority
DE
Germany
Prior art keywords
furnace
openings
preheat zone
tunnel
flow fan
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.)
Withdrawn
Application number
DE19762657829
Other languages
German (de)
Inventor
Andreas Ing Grad Haessler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19762657829 priority Critical patent/DE2657829A1/en
Publication of DE2657829A1 publication Critical patent/DE2657829A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/12Furnaces 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/04Circulating atmospheres by mechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/12Furnaces 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
    • F27B2009/122Preheating

Abstract

Temps. in the preheat section of a tunnel furnace are evened out using a reverse flow process. At least one reversible fan is used with suction branches in the lower part of the combustion passage. It is connected to reinjection points in the roof of the passage. The hot gases are then cyclically extracted from the lower zone of the furnace and are reinjected via the inlets in the roof. The suction points of the fan are connected both with the lower section of the combustion zone and with the space below the firing trolleys. Partition walls with adjustable slides are provided between the zones below the trolleys. A reverse flow fan can be located at both furnace inlet and outlet and both operated simultaneously in sucking and blowing modes. Used in tunnel furnaces and reduces the temp. differing between the top and bottom of the furnace passage caused by the high thermal inertia of the trolleys.

Description

PER EINSCHREIBEN "Verfahren zur Vergleichmäßigung der Temperatur in Tunnelöfen" Besonders die Anwärmzonen von Tunnelöfen weisen nach dem Stand der Technik im Brennkanal erhebliche Temperaturdifferenzen vom unteren zum oberen Bereich auf. Der Grund liegt an der thermischen Entmischung des Abgasstroms, der stets vorhandenen Undichtigkeiten der Brennwagen und andererseits im höheren Wärme bedarf der schweren Brennwagenbeläge.BY REGISTERED "Procedure for equalizing the temperature in Tunnel ovens "The heating zones of tunnel ovens in particular are state-of-the-art In the firing channel there are considerable temperature differences from the lower to the upper area. The reason is the thermal segregation of the exhaust gas flow, which is always present Leakages of the Brennwagen and on the other hand in the higher heat needs the heavy ones Kiln car coverings.

Der Erfindung liegt die Aufgabe zugrunde, vorliegende Mängel zu beseitigen, so daß schneller und gleichmäßiger gebrannt werden kann. Ausgehend vom Stand der Technik hat sich das Reversierstrombrennverfahren besonders zur dreidimensionalen Temperaturvergleichmäßigung in der Peuerzone von Tunnelöfen hervorragend bewährt. Jedoch konnte die thermische Entmischung in der Anwärmzone durch die gemeinsam für Entnahme und Einblasen des Gasstromes verwendeten Anschluß5ffnungen am Brennkanal nicht verhindert werden.The invention is based on the object of eliminating the present deficiencies, so that you can burn faster and more evenly. Based on the status of the Technology has made the reversing current combustion process particularly three-dimensional Uniformity of temperature in the fire zone of tunnel kilns has proven to be excellent. However, the thermal segregation in the heating zone could be caused by the common for Withdrawal and injection of the gas stream used connection openings on the combustion channel cannot be prevented.

Der verfahrungsgemäß stärkere Unterdruck im Brennkanal führte zu höheren Undichtigkeiten und Kaltluft einbruch im unteren Brennkanalbereich, der durch die jeweils der Zugphase folgenden Druckphase nicht voll ausgeglichen wurde.The higher negative pressure in the combustion channel, as is the case in the process, led to higher ones Leaks and cold air ingress in the lower combustion channel area, caused by the was not fully compensated for in each case the pressure phase following the pulling phase.

- 2 - Seite zur Patentanmeldung "Verfahren zur Vergleichmäßigung der Temperatur in Tunnelöfen" Erfindungsgemäß wird vorgeschlagen, daß gemäß rig. 1 ein oder mehrere an einem Tunnelofen (1) angeschlossene Reversierstromgebläse (2) derart an die Anwärmzone (3) des Brennkanals angeschlossen werden, daß der/die Ansaugstutzen (4) des Reversierstromgebläses (2) an den unteren Bereich der Anwärmzone (3) über Füchse (5) oaer andere Anschlußöffnungen angeschlossen wird und der/die Drucketutzen (6) über die Ofendeoke der Anwärinzone (3) angeschlossen werden.- 2 - Page to the patent application "Procedure for equalizing the Temperature in tunnel ovens "According to the invention it is proposed that according to rig or several reversing current blowers (2) connected to a tunnel furnace (1) in this way connected to the heating zone (3) of the combustion duct so that the intake port (s) (4) of the reversing flow fan (2) to the lower area of the heating zone (3) Foxes (5) or other connection openings are connected and the pressure port (s) (6) can be connected via the furnace end of the heating zone (3).

Durch dieses periodisch wechselnde Absaugen der Rauchgase im unteren Brennkanalbereich und das Periodische Einblasen im oberen Bereich mit im wesentlichen vollen Rauchgasvolumenstrom ergibt sich eine intensive, turbulente Gasmischung von oben nach unten mit damit verbundener Vergleichmäßigung der Temperaturen. Dae Einblasen des Rauchgases erfolgt zweckmäßigerweise über mehrere Öffnungen im oberen Brennkanalbereich.This periodically changing suction of the smoke gases in the lower Firing channel area and the periodic injection in the upper area with essentially full flue gas volume flow results in an intense, turbulent gas mixture of from top to bottom with the associated equalization of temperatures. Blow in Dae The flue gas expediently takes place through several openings in the upper combustion channel area.

Ein weiteres Merkmal der Erfindung besteht darin, daß während der Ansaugphase mindestens eine Ansaugöffnung (7) unterhalb des Brennkanals an den Saugstutzen (4) angeschlossen wird, um unterhalb der Brennwagen ähnlichen Unterdruck wie im Brennkanal darüberliegend zu erzeugen: Daher ist vorgesehen, einstellbare Schieber (8) Abschnittsweise unterhalb des Brennwagenzuges anzuordnen, um den Unterdruck unterhalb des Brennkanals gemäß der Druckkurve "C" der Unterdruckkurve "D" des Brennkanals Fig. 2 während der Saugphase anzupassen und abzustufen.Another feature of the invention is that during the Suction phase at least one suction opening (7) below the combustion duct on the suction nozzle (4) is connected to create a negative pressure similar to that in To create a firing channel above: Therefore, adjustable slides are provided (8) To be arranged in sections below the kiln car train to reduce the negative pressure below the combustion channel according to the pressure curve "C" of the negative pressure curve "D" of the combustion channel Fig. 2 adapt and graduate during the suction phase.

Das Druckverlaufsdiagramm Fig. 2 zeigt den Druckverlauf während der Druckphase "E" im Brennkanal. Während der Druckphase "E" herrscht im Begehkanal unterhalb des - 3 - Seite zur Patentan@eldung "Verfahren zur Vergleichmäßigung der Temperatur in Tunnelöfen" Wagenzuges im Wesentlichen atmosphärischer Druck, so daß ohnehin keine Falschluft von unterhalb der Brennwagen in die Anwärmzono des Tunnelofens eindringen kann.The pressure curve diagram Fig. 2 shows the pressure curve during Pressure phase "E" in the combustion channel. During the pressure phase "E" there is in the access channel below the - 3 - Patent application page "Procedure for equalization the temperature in tunnel ovens "train of wagons is essentially atmospheric pressure, so that in any case no false air from below the kiln car into the heating zone Tunnel furnace can penetrate.

Eine weitere Ausgestaltung der Erfindung besteht darin, daß am Ofeneingang und Ausgang mindestens je ein Reversierstromgebläse angeschlossen wird in vorbeschriebener Weise und die Gebläse synchron geschaltet werden, d. h. jeweils gleichzeitig saugend und drückend. Damit lassen sich auch lange Drennkanäle verfahrensgemäß betreiben L e e r s e i t eAnother embodiment of the invention is that at the furnace entrance and output at least one reversing current fan is connected in each case described above Way and the fans are switched synchronously, d. H. both sucking at the same time and oppressive. This means that long drainage channels can also be operated in accordance with the method L. e e r e i t e

Claims (1)

PER EINSCHREIBEN A N S P R Ü C H E Anspruch 1 Verfahren zur Vergleichmäßigung der Temperatur in der Anwärmzone eines Tunnelofens nach dem Reversierstromverfahren dadurch gekennzeichnet, daß mindestens ein Reversierstromgebläse mit seinem (n) Ansaugstutzen an im unteren Bereich des Brennkanals liegenden Abgasöffnungen angeschlossen wird und der/die Druckstutzen des Reversierstromgebläses im oberen Bereich des Brennkanals durch Wand und/oder Deckenöffnungen angeschlossen wird/ werden und das Abgas über die im unteren Bereich liegenden Abgasöffnungen aus dem Ofen rhytmisch entnommen wird und über die oberen Öffnungen rhytmisch in die Anwärmzone des Tunnelofens wieder eingeblasen wird.BY REGISTERED LETTER TO A N S P R Ü C H E Claim 1 method for equalization the temperature in the heating zone of a tunnel furnace using the reversing flow method characterized in that at least one reversing flow fan with its Intake manifold connected to exhaust gas openings in the lower area of the combustion duct and the pressure port (s) of the reversing flow fan in the upper area of the combustion duct is / are connected through wall and / or ceiling openings and the exhaust gas via the exhaust gas openings in the lower area are rhythmically removed from the furnace and rhythmically through the upper openings into the heating zone of the tunnel oven is blown in. Anspruch 2 Verfahren nach A 1 dadurch gekennzeichnet, daß der Ansaugstutzen des Reversierstromgebläses sowohl mit den im unteren Bereich des Erennkanals liegenden Abgas nungen und an Ansaugöffnungen unterhalb des Brennwagenzuges im Ofen verbunden ist.Claim 2 method according to A 1, characterized in that the intake port of the reversing flow fan both with the ones in the lower area of the detection channel Exhaust connections and connected to suction openings below the kiln car train in the furnace is. Anspruch 3 Verfahren nach A 1 und b 2 dadurch gekennzeichnet, daß in Längsrichtung de. Tunnelofens zwischen Unterkontur der Brennwagen und Ofenfundament Trennwände mit einstellbaren Öffnungen in Abständen eingebaut werden.Claim 3 method according to A 1 and b 2, characterized in that lengthways de. Tunnel oven between the lower contour the Brennwagen and furnace foundation partitions with adjustable openings built in at intervals will. uch 4 Verfahren nach A 1 - 3 dadurch gekennzeichnet, daß sowohl am Ofeneingang als auch am Ofenausgang ein Reversierstromgebläse eingesetzt wird und beide synchron, d. h. gleichzeitig saugend und drückend betrieben werden.uch 4 method according to A 1 - 3 characterized in that both on A reversing flow fan is used and at the furnace inlet as well as at the furnace outlet both synchronously, d. H. operated simultaneously with suction and pressure. "Ansprüche""Expectations"
DE19762657829 1976-12-21 1976-12-21 Tunnel furnace with preheat zone - has reversible fan to recirculate hot gases in the preheat zone for uniform temps. Withdrawn DE2657829A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762657829 DE2657829A1 (en) 1976-12-21 1976-12-21 Tunnel furnace with preheat zone - has reversible fan to recirculate hot gases in the preheat zone for uniform temps.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762657829 DE2657829A1 (en) 1976-12-21 1976-12-21 Tunnel furnace with preheat zone - has reversible fan to recirculate hot gases in the preheat zone for uniform temps.

Publications (1)

Publication Number Publication Date
DE2657829A1 true DE2657829A1 (en) 1978-06-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762657829 Withdrawn DE2657829A1 (en) 1976-12-21 1976-12-21 Tunnel furnace with preheat zone - has reversible fan to recirculate hot gases in the preheat zone for uniform temps.

Country Status (1)

Country Link
DE (1) DE2657829A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0170828A2 (en) * 1984-06-14 1986-02-12 Toto Ltd. Method for controlling preheating zone of tunnel kiln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0170828A2 (en) * 1984-06-14 1986-02-12 Toto Ltd. Method for controlling preheating zone of tunnel kiln
EP0170828A3 (en) * 1984-06-14 1988-07-20 Toto Ltd. Method for controlling preheating zone of tunnel kiln

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