EP0261462A2 - Radiant tube burner comprising a catalyst bed for a heat treatment furnace - Google Patents

Radiant tube burner comprising a catalyst bed for a heat treatment furnace Download PDF

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Publication number
EP0261462A2
EP0261462A2 EP87112805A EP87112805A EP0261462A2 EP 0261462 A2 EP0261462 A2 EP 0261462A2 EP 87112805 A EP87112805 A EP 87112805A EP 87112805 A EP87112805 A EP 87112805A EP 0261462 A2 EP0261462 A2 EP 0261462A2
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EP
European Patent Office
Prior art keywords
tube
burner
radiant
jet
gas
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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.)
Granted
Application number
EP87112805A
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German (de)
French (fr)
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EP0261462A3 (en
EP0261462B1 (en
Inventor
Reinhard Dipl.-Ing. Strigl
Andreas Dipl.-Ing. Dey
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Linde GmbH
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Linde GmbH
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Priority to AT87112805T priority Critical patent/ATE60366T1/en
Publication of EP0261462A2 publication Critical patent/EP0261462A2/en
Publication of EP0261462A3 publication Critical patent/EP0261462A3/en
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Publication of EP0261462B1 publication Critical patent/EP0261462B1/en
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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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D99/0035—Heating indirectly through a radiant surface
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • C21D1/763—Adjusting the composition of the atmosphere using a catalyst

Definitions

  • the invention relates to a radiant tube burner for furnaces for the heat treatment of metallic workpieces under the action of a treatment gas, which is generated by catalytic conversion of a feed gas, with a jacket tube which has gas outlet openings at its end, a inner tube arranged coaxially at a distance from the jacket tube, in which at least a burner tube and an air supply tube are arranged, and with a catalyst bed which at least partially fills the space between the jacket tube and the inner tube.
  • Radiant tube burners of this type are frequently used in heat treatment furnaces which are already equipped with simple radiant tube burners which are used exclusively for heating, one or some of these simple radiant tube burners being replaced by such special radiant tube burners.
  • a known, such special jet tube burner in which a protective gas for the heat treatment of metallic workpieces, for example for the, by a catalytic conversion of a natural gas-air mixture Gas carburizing, bright hardening or carbonitriding is produced, has the construction described at the beginning and also has thermal insulation that acts against the furnace interior. This heat insulation is applied to the outside of the radiant tube burner and thereby increases its cross-sectional area. Its purpose is to prevent the protective gas generation from being adversely affected by different furnace temperatures (DE-OS 27 58 024).
  • the heat treatment of metallic workpieces under the action of a treatment gas can only be carried out successfully if the composition of the treatment gas supplied to the furnace is optimally adapted to the respective type of heat treatment at any time.
  • the treatment gas which may consist essentially of carbon monoxide, hydrogen and nitrogen, for example, by catalytic conversion of a feed gas, for example a natural gas / air mixture, in special jet tube burners of the type described in the introduction, the composition of the treatment gas is essentially determined by the composition of the feed gas and determined by the temperature prevailing in the catalyst bed. Both influencing factors therefore require precise regulation, which has not yet been satisfactorily achieved.
  • the invention is therefore based on the object of improving the jet tube burner of the type described at the outset in such a way that precise regulation of the composition of the treatment gas is possible without significant structural outlay.
  • At least one burner tube is displaceable in the longitudinal direction of the jet tube burner.
  • the displaceability of at least one burner tube according to the invention creates a possibility of regulating the temperature distribution in the catalyst bed and thus the composition of the treatment gas with surprising accuracy.
  • the temperature prevailing there and influenced by the fluctuating furnace temperature is measured via a temperature sensor arranged in the catalyst bed and fed to a control unit. If the temperature in the catalyst bed deviates from the target temperature, e.g.
  • the burner tube which is stored in a fabric bushing, is pushed forwards or backwards by a motor until the desired temperature is reached.
  • the jet tube burner according to the invention can achieve an accuracy of the composition of the treatment gas required in each case, which was not possible with the previously known methods.
  • the radiant tube burner according to the invention has only one burner tube, it is advantageous if the burner tube is arranged along the longitudinal axis of the radiant tube burner, the air supply tube coaxially surrounds the burner tube and the space between the inner tube and the Air supply pipe is provided for the discharge of the burner exhaust gas.
  • the idea underlying the invention of the displaceability of the burner tubes for the special case of a single burner tube is specified in a particularly simple manner.
  • a particularly precise control of the composition of the treatment gas can be achieved with a radiant tube burner according to the invention with a plurality of burner tubes if the burner tubes are arranged on an imaginary cylinder surface coaxially to the longitudinal axis of the radiant tube burner, the air guide tube coaxially surrounds the imaginary cylinder surface at least partially and an exhaust pipe along the longitudinal axis of the Jet burner is arranged within the imaginary cylinder surface.
  • the maximum of the thermal energy can always be supplied to the catalyst bed at the point where it is currently needed. This is of particular importance because the catalytic conversion of the feed gas in the catalyst bed is initially exothermic and only becomes endothermic in the further course, i.e. the supply of thermal energy can be concentrated primarily on the endothermic area.
  • a further advantageous embodiment of the jet tube burner according to the invention is that the inner tube has bores which connect the interior of the inner tube through the wall of the inner tube with the intermediate space between the jacket tube and the inner tube.
  • the composition of the treatment gas can, on the one hand, via the composition of the feed gas and, on the other hand, due to the high temperature of the burner exhaust gas, can be regulated via the temperature.
  • the amount of burner exhaust gas to be fed to the feed gas is advantageously controlled via a valve arranged in the exhaust pipe of the jet pipe burner, by means of which the burner exhaust gas can be throttled.
  • the holes in the wall of the inner tube either open directly into the catalyst bed or, in the case of jet tube burners with a shortened catalyst bed, into the space between the jacket tube and the inner tube that is not filled with catalyst. In special cases, both arrangements can also be provided.
  • a particularly good heat transfer from the burner chamber into the catalyst bed is achieved if the burner tube or the burner tubes have swirl nozzles at their end, since this causes the burner flame and the burner exhaust gas to be swirled strongly by rotation.
  • a further advantageous embodiment of the jet tube burner according to the invention is that the jacket tube is at least partially surrounded on the outside by an air-filled space which is circular in cross-section.
  • the additional covering of the catalyst bed with an air-filled space acts as thermal insulation against the hot furnace atmosphere.
  • this additional space can be designed as part of the air supply to the burner space and thus enables special combustion air preheating.
  • the radiant tube burner according to the invention also has significant structural advantages, since it can be installed in a simple manner in all furnaces which are already operated with normal radiant tube burners for heating purposes.
  • This advantage is achieved in that a jacket tube of an already existing, simple jet tube burner serving for heating purposes is used as the jacket tube for the jet pipe burner according to the invention. Due to this design of the radiant tube burner according to the invention, which touches on its construction, which is rationally thought through in all variants, it becomes possible to keep an already existing casing tube of one of the simple radiant tube burners of a furnace used for heating as a casing tube and all other parts in the manner of a smaller, complete special radiant tube burner to be installed in the casing pipe. It is therefore not necessary with the radiant tube burner according to the invention to enlarge the openings already present in the furnace wall.
  • a jacket tube 4 is installed in the brick wall 1 of a heat treatment furnace via a support tube 2 on the one hand and a holder 3 on the other hand, and forms the outer casing of a jet tube burner according to the invention.
  • the casing tube 4 can be a casing tube of a radiant tube burner for heating purposes, as is already available in large numbers in furnaces of this type. This has the advantage that the radiant tube burner according to the invention can be installed in the manner of a small, complete, special radiant tube burner without any particular design effort, in particular without enlarging the passage opening in the wall 1 of the furnace.
  • a burner tube 7 is arranged along the longitudinal axis of the jet pipe burner, which has a nozzle 8 at its end.
  • the space between the jacket tube 4 and the inner tube 5 is filled with a catalyst bed 9 up to a grid 10 and connected to a feed 11 for the feed gas, from which the treatment gas is generated by catalytic reaction in the catalyst bed 9.
  • the space between the casing tube 4 and the inner tube 5 can be completely or partially filled with the catalyst bed 9.
  • the catalyst bed 9 can consist of a specific catalyst or of mixtures or layers of different catalysts.
  • the treatment gas leaves the catalyst bed 9 through gas outlet openings 12 which are attached to the end of the casing tube 4 and lead into the interior of the furnace.
  • the interior of the air supply pipe 6 is with a Air supply 13 and the burner tube 10 connected to a burner gas supply 14.
  • the space between the inner tube 5 and the air supply 6 serves as exhaust gas discharge and is therefore connected at its end to an exhaust pipe 15.
  • a temperature sensor 16 in which a thermocouple for sensing the temperature in the catalyst bed 9 is slidably accommodated, and an analysis tube 17 with which the composition of the gas outlet openings 12 exits into the furnace chamber Treatment gas can be monitored.
  • the burner tube 7 is in a fabric bushing 18 along the longitudinal axis of the jet tube burner, e.g. with the help of a motor, not shown, arranged displaceably, which is indicated in the figure by the dashed lines at 7a.
  • a motor not shown
  • the heat of the flame burning in the area of the nozzle 8 can be used in a targeted manner at that point of the catalyst bed 9 where it is optimally used with regard to the desired composition of the treatment gas.
  • Bores 19 are provided in the wall of the inner tube 5, which connect the intermediate space between the inner tube 5 and the air supply tube 6 with the intermediate space between the inner tube 5 and the jacket tube 4, which is partially filled with the catalyst bed 9.
  • Burner exhaust gas can be mixed into the treatment gas through the bores 19 and the composition thereof can thus be specifically changed.
  • heat is supplied to both the catalyst bed 9 and the furnace itself, which can reduce the heating costs of the furnace.
  • the bores 19 partly open directly into the catalyst bed 9, partly even into the empty space in front of it.
  • an exhaust valve 20 with a pressure monitor 21 is provided in the exhaust line 15, which is in operative connection with the analysis tube 17, for example.
  • the jet tube burner shown is operated with natural gas, which is also part of the feed gas for the production of the treatment gas.
  • the ratio of natural gas to air for the burner is 1:10 to 1:20, while this ratio for the feed gas is precisely regulated between 1: 2.1 to 1: 2.6. If, as provided in accordance with the invention, this regulation takes place via an admixture of burner exhaust gas through the bores 19, a separate regulation of the composition of the feed gas introduced through the feed 11 can be omitted.
  • FIG. 2 shows another embodiment of the jet tube burner according to the invention, which differs from that of FIG. 1 essentially in that instead of a single burner tube 7 (FIG. 1), several burner tubes 37 (FIG. 2) are provided, two of which are shown in the figure 2 are shown.
  • the burner tubes 37 which are arranged on an imaginary cylinder surface coaxially to the longitudinal axis of the radiant tube burner, according to the invention can each be displaced parallel to the longitudinal axis of the radiant tube burner in the stuffing boxes 48, which is indicated by the dashed lines at 37a.
  • the air is supplied via an air supply tube 36 which surrounds the burner tubes 37 to close to the end thereof, while the burner exhaust gas is removed via a separate exhaust pipe 52 along the longitudinal axis the radiant tube burner within the imaginary cylinder surface on which the burner tubes 37 lie, is arranged.
  • the nozzles seated on the burner tubes 37 are designed as swirl nozzles 38, which cause a strong swirling of the burner flame and the burner exhaust gas.
  • the influencing of the composition of the treatment gas by passing burner exhaust gas through the openings 19 in the inner tube 5 can be varied even further in this embodiment in that some of the openings 19 are provided at a location on the inner tube 5 which is wholly or partly still in terms of flow unused combustion air lies, ie
  • hot air can also be added to the feed gas.
  • This measure allows the partial pressure of carbon dioxide and water vapor in the catalyst bed 9 to be increased, which leads to a greater catalyst yield and increases the temperature in the endothermic reaction zone.
  • the catalyst bed 9 can also be operated at a low furnace temperature.
  • FIG. 3 A further embodiment of the jet tube burner according to the invention is indicated in FIG. 3, all special components, which are shown and explained in detail in FIGS. 1 and 2, being omitted.
  • the casing tube 4 is surrounded by a space 60 with an annular cross section through which air flows from the entry point 61 to the exit point 62.
  • This air envelope in space 60 acts on the one hand as thermal insulation from the interior of the furnace and on the other hand, if it is part of the supply for the combustion air, as a preheating space for the latter.
  • Another advantage of this embodiment of the jet tube burner according to the invention is that the temperature in the catalyst bed 9 drops because it is cooled by the cold combustion air. This makes the temperature more even over the length and the material stress less. Instead of air, fuel gas can also be passed through the preheating.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
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  • Gas Burners (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The radiant tube burner for furnaces for heat-treating metallic workpieces under the action of a treatment gas generated by catalytic reaction of a feed gas has a shell tube, which has gas outlet orifices at its end, an inner tube which is coaxially arranged in and at a distance from the shell tube and in which at least one burner tube and an air feed tube are arranged, and also a catalyst bed which at least partially fills the interspace between the shell tube and the inner tube. To improve the controllability of the composition of the treatment gas, it is proposed that at least one burner tube of the radiant tube burner is displaceable in the longitudinal direction thereof.

Description

Die Erfindung betrifft einen Strahlrohrbrenner für Öfen zur Wärmebehandlung metallischer Werkstücke unter Einwirkung eines Behandlungsgases, das durch katalytische Umsetzung eines Einsatzgases erzeugt wird, mit einem Mantelrohr, das an seinem Ende Gasaustrittsöffnungen aufweist, einem koaxial mit Abstand zum Mantelrohr in diesem angeordneten Innenrohr, in dem mindestens ein Brennerrohr und ein Luftzuführungsrohr angeordnet sind, sowie mit einem Katalysatorbett, das den Zwischenraum zwischen Mantelrohr und Innenrohr mindestens teilweise ausfüllt.The invention relates to a radiant tube burner for furnaces for the heat treatment of metallic workpieces under the action of a treatment gas, which is generated by catalytic conversion of a feed gas, with a jacket tube which has gas outlet openings at its end, a inner tube arranged coaxially at a distance from the jacket tube, in which at least a burner tube and an air supply tube are arranged, and with a catalyst bed which at least partially fills the space between the jacket tube and the inner tube.

Strahlrohrbrenner dieser Art werden häufig in Wärmebehandlungsöfen eingesetzt, die bereits mit einfachen, ausschließlich der Beheizung dienenden Strahlrohrbrennern ausgerüstet sind, wobei einer oder einige dieser einfachen Strahlrohrbrenner gegen solche Spezialstrahlrohrbrenner ausgetauscht werden. Ein bekannter, derartiger Spezialstrahlrohrbrenner, bei dem durch eine katalytische Umsetzung eines Erdgas-Luft-Gemisches ein Schutzgas für die Wärmebehandlung metallischer Werkstücke, z.B. für das Gasaufkohlen, Blankhärten oder Carbonitrieren erzeugt wird, weist die eingangs beschriebene Bauweise auf und besitzt außerdem eine gegenüber dem Ofeninnenraum wirkende Wärmeisolierung. Diese Wärmeisolierung ist außen auf dem Strahlrohrbrenner aufgebracht und vergrößert dadurch dessen Querschnittsfläche. Sie hat den Zweck, eine negative Beeinflussung der Schutzgaserzeugung durch unterschiedliche Ofentemperaturen zu verhindern (DE-OS 27 58 024).Radiant tube burners of this type are frequently used in heat treatment furnaces which are already equipped with simple radiant tube burners which are used exclusively for heating, one or some of these simple radiant tube burners being replaced by such special radiant tube burners. A known, such special jet tube burner, in which a protective gas for the heat treatment of metallic workpieces, for example for the, by a catalytic conversion of a natural gas-air mixture Gas carburizing, bright hardening or carbonitriding is produced, has the construction described at the beginning and also has thermal insulation that acts against the furnace interior. This heat insulation is applied to the outside of the radiant tube burner and thereby increases its cross-sectional area. Its purpose is to prevent the protective gas generation from being adversely affected by different furnace temperatures (DE-OS 27 58 024).

Die Wärmebehandlung metallischer Werkstücke unter Einwirkung eines Behandlungsgases kann nur dann mit Erfolg durchgeführt werden, wenn die Zusammensetzung des dem Ofen zugeführten Behandlungsgases zu jedem Zeitpunkt der jeweiligen Art der Wärmebehandlung optimal angepaßt ist. Bei der Herstellung des Behandlungsgases, das z.B. im wesentlichen aus Kohlenmonoxid, Wasserstoff und Stickstoff bestehen kann, durch katalytische Umsetzung eines Einsatzgases, z.B. eines Erdgas-Luft-Gemi­sches, in speziellen Strahlrohrbrennern der eingangs beschriebenen Art wird die Zusammensetzung des Behandlungsgases im wesentlichen durch die Zusammensetzung des Einsatzgases und durch die im Katalysatorbett herrschende Temperatur bestimmt. Beide Einflußgrößen bedürfen deshalb einer genauen Regelung, die jedoch bisher nicht in zufriedenstellender Weise gelungen ist. Dies gilt insbesondere für die Katalysatortemperatur bei den speziellen Strahlrohrbrennern, bei denen sich, wie beschrieben, das Katalysatorbett innerhalb des Ofens befindet und dadurch der schwankenden Ofentemperatur ausgesetzt ist. Eine nach ihrer Aufbringung nicht mehr veränderbare Wärmeisolierung zwischen Katalysatorbett und Ofenatmosphäre kann dieses Problem nicht lösen, da sie nur eine Temperaturverschiebung mit nahezu gleichbleibenden Schwankungen bewirkt.The heat treatment of metallic workpieces under the action of a treatment gas can only be carried out successfully if the composition of the treatment gas supplied to the furnace is optimally adapted to the respective type of heat treatment at any time. In the production of the treatment gas, which may consist essentially of carbon monoxide, hydrogen and nitrogen, for example, by catalytic conversion of a feed gas, for example a natural gas / air mixture, in special jet tube burners of the type described in the introduction, the composition of the treatment gas is essentially determined by the composition of the feed gas and determined by the temperature prevailing in the catalyst bed. Both influencing factors therefore require precise regulation, which has not yet been satisfactorily achieved. This applies in particular to the catalyst temperature in the special jet tube burners, in which, as described, the catalyst bed is located inside the furnace and is therefore exposed to the fluctuating furnace temperature. A thermal insulation between the catalyst bed and the furnace atmosphere that cannot be changed after it has been applied cannot solve this problem, since it only causes a temperature shift with almost constant fluctuations.

Der Erfindung liegt deshalb die Aufgabe zugrunde, die Strahlrohrbrenner der eingangs beschriebenen Art so zu verbessern, daß eine genaue Regelung der Zusammensetzung des Behandlungsgases ohne einen ins Gewicht fallenden konstruktiven Aufwand möglich wird.The invention is therefore based on the object of improving the jet tube burner of the type described at the outset in such a way that precise regulation of the composition of the treatment gas is possible without significant structural outlay.

Diese Aufgabe wird dadurch gelöst, daß mindestens ein Brennerrohr in Längsrichtung des Strahlrohrbrenners verschiebbar ist.This object is achieved in that at least one burner tube is displaceable in the longitudinal direction of the jet tube burner.

Durch die erfindungsgemäße Verschiebbarkeit mindestens eines Brennerohres wird eine Möglichkeit geschaffen, die Temperaturverteilung im Katalysatorbett und damit die Zusammensetzung des Behandlungsgases mit überraschender Genauigkeit zu regeln. Hierzu wird über einen im Katalysatorbett angeordneten Temperaturfühler die jeweils dort herrschende und von der schwankenden Ofentemperatur beeinflußte Temperatur gemessen und einer Regeleinheit zugeführt. Bei Abweichungen der Temperatur im Katalysatorbett von der Solltemperatur wird z.B. über einen Motor das in einer Stoffbuchse gelagerte Brennerrohr so lange vor- oder zurückgeschoben, bis die gewünschte Temperatur erreicht ist. In Kombination mit einem weiteren Regelsystem für die Zusammensetzung des Einsatzgases, aus dem das Behandlungsgas erzeugt wird, kann mit dem erfindungsgemäßen Strahlrohrbrenner eine Genauigkeit der jeweils erforderlichen Zusammensetzung des Behandlungsgases erzielt werden, die mit den bisher bekannten Methoden nicht möglich war.The displaceability of at least one burner tube according to the invention creates a possibility of regulating the temperature distribution in the catalyst bed and thus the composition of the treatment gas with surprising accuracy. For this purpose, the temperature prevailing there and influenced by the fluctuating furnace temperature is measured via a temperature sensor arranged in the catalyst bed and fed to a control unit. If the temperature in the catalyst bed deviates from the target temperature, e.g. The burner tube, which is stored in a fabric bushing, is pushed forwards or backwards by a motor until the desired temperature is reached. In combination with a further control system for the composition of the feed gas from which the treatment gas is generated, the jet tube burner according to the invention can achieve an accuracy of the composition of the treatment gas required in each case, which was not possible with the previously known methods.

Wenn der erfindungsgemäße Strahlrohrbrenner nur ein Brennerrohr aufweist, ist es von Vorteil, wenn das Brennerohr entlang der Längsachse des Strahlrohrbrenners angeordnet ist, das Luftzuführungsrohr das Brennerrohr koaxial umgibt und der Zwischenraum zwischen dem Innenrohr und dem Luftzuführungsrohr für die Abführung des Brennerabgases vorgesehen ist. Bei dieser Bauweise ist der der Erfindung zugrundeliegende Gedanke der Verschiebbarkeit der Brennerrohre für den Spezialfall eines einzigen Brennerrohs in besonders einfacher Weise konkretisiert. Eine besonders genaue Regelung der Zusammensetzung des Behandlungsgases läßt sich mit einem erfindungsgemäßen Strahlrohrbrenner mit mehreren Brennerrohren erreichen, wenn die Brennerrohre auf einer gedachten Zylinderfläche koaxial zur Längsachse des Strahlrohrbrenners angeordnet sind, das Luftführungsrohr koaxial die gedachte Zylinderfläche mindestens teilweise umgibt und ein Abgasrohr entlang der Längsachse des Strahlrohbrenners innerhalb der gedachten Zylinderfläche angeordnet ist.If the radiant tube burner according to the invention has only one burner tube, it is advantageous if the burner tube is arranged along the longitudinal axis of the radiant tube burner, the air supply tube coaxially surrounds the burner tube and the space between the inner tube and the Air supply pipe is provided for the discharge of the burner exhaust gas. With this construction, the idea underlying the invention of the displaceability of the burner tubes for the special case of a single burner tube is specified in a particularly simple manner. A particularly precise control of the composition of the treatment gas can be achieved with a radiant tube burner according to the invention with a plurality of burner tubes if the burner tubes are arranged on an imaginary cylinder surface coaxially to the longitudinal axis of the radiant tube burner, the air guide tube coaxially surrounds the imaginary cylinder surface at least partially and an exhaust pipe along the longitudinal axis of the Jet burner is arranged within the imaginary cylinder surface.

Mit den beschriebenen Bauweisen des erfindungsgemäßen Strahlrohrbrenners kann das Maximum der Wärmeenergie dem Katalysatorbett stets an derjenigen Stelle zugeführt werden, wo sie gerade gebraucht wird. Dies ist deshalb von besonderer Bedeutung, weil die katalytische Umsetzung des Einsatzgases im Katalysatorbett zunächst exotherm verläuft und erst im weiteren Verlauf endotherm wird, d.h. die Zufuhr der Wärmeenergie kann vor allem auf den endothermen Bereich konzentriert werden.With the described designs of the jet tube burner according to the invention, the maximum of the thermal energy can always be supplied to the catalyst bed at the point where it is currently needed. This is of particular importance because the catalytic conversion of the feed gas in the catalyst bed is initially exothermic and only becomes endothermic in the further course, i.e. the supply of thermal energy can be concentrated primarily on the endothermic area.

Eine weitere vorteilhafte Ausgestaltung des erfindungsgemäßen Strahlrohrbrenners besteht darin, daß das Innenrohr Bohrungen aufweist, die den Innenraum des Innenrohres durch die Wandung des Innenrohres hindurch mit dem Zwischenraum zwischen Mantelrohr und Innenrohr verbinden. Die besondere Bedeutung dieser Bauweise wird deutlich, wenn beachtet wird, daß Strahlrohrbrenner mit Katalysatorbett nicht nur mit einem Brenngas-Luft-Gemisch als Einsatzgas, sondern auch mit einem Gemisch dieser Komponenten mit Brennerabgas betrieben werden können. Mit der gesteuerten Zuführung von Brennerabgas zum üblichen Einsatzgas, das bei der zuletzt beschriebenen Ausgestaltung des erfindungsgemäßen Strahlrohrbrenners über die den Innenraum des Innenrohrs mit dem Zwischenraum zwischen Mantelrohr und Innenrohr verbindenden Bohrungen erfolgt, kann die Zusammensetzung des Behandlungsgases einerseits über die Zusammensetzung des Einsatzgases und andererseits, infolge der hohen Temperatur des Brennerabgases, über die Temperatur geregelt werden. Die Menge des dem Einsatzgas zuzuspeisenden Brennerabgases wird hierbei vorteilhaft über ein in der Abgasleitung des Strahlrohrbrenners angeordnetes Ventil gesteuert, durch das das Brennerabgas angedrosselt werden kann.A further advantageous embodiment of the jet tube burner according to the invention is that the inner tube has bores which connect the interior of the inner tube through the wall of the inner tube with the intermediate space between the jacket tube and the inner tube. The particular importance of this design becomes clear when it is noted that jet tube burners with a catalyst bed can be operated not only with a fuel gas-air mixture as feed gas, but also with a mixture of these components with burner exhaust gas. With the controlled supply of burner exhaust gas to the Usual feed gas, which takes place in the last-described configuration of the jet pipe burner according to the invention via the bores connecting the interior of the inner pipe with the intermediate space between the casing pipe and the inner pipe, the composition of the treatment gas can, on the one hand, via the composition of the feed gas and, on the other hand, due to the high temperature of the burner exhaust gas, can be regulated via the temperature. The amount of burner exhaust gas to be fed to the feed gas is advantageously controlled via a valve arranged in the exhaust pipe of the jet pipe burner, by means of which the burner exhaust gas can be throttled.

Die Bohrungen in der Wandung des Innenrohrs münden entweder direkt in das Katalysatorbett oder, bei Strahlrohrbrennern mit verkürztem Katalysatorbett, in den nicht mit Katalysator gefüllten Zwischenraum zwischen Mantelrohr und Innenrohr. In besonderen Fällen können auch beide Anordnungen vorgesehen sein.The holes in the wall of the inner tube either open directly into the catalyst bed or, in the case of jet tube burners with a shortened catalyst bed, into the space between the jacket tube and the inner tube that is not filled with catalyst. In special cases, both arrangements can also be provided.

Ein besonders guter Wärmeübergang vom Brennerraum in das Katalysatorbett wird erzielt, wenn das Brennerrohr oder die Brennerrohre an ihrem Ende Dralldüsen aufweisen, da hierdurch die Brennerflamme und das Brennerabgas durch Rotation stark verwirbelt werden.A particularly good heat transfer from the burner chamber into the catalyst bed is achieved if the burner tube or the burner tubes have swirl nozzles at their end, since this causes the burner flame and the burner exhaust gas to be swirled strongly by rotation.

Eine weitere vorteilhafte Ausgestaltung des erfindungsgemäßen Strahlrohrbrenners besteht darin, daß das Mantelrohr auf seiner Außenseite mindestens teilweise von einem luftgefüllten und im Querschnitt kreisringförmigen Raum umgeben ist. Die zusätzliche Umhüllung des Katalysatorbetts mit einem luftgefüllten Raum wirkt als Wärmeisolatin gegenüber der heißen Ofenatmosphäre. Außerdem kann dieser zusätzliche Raum als Teil der Luftzuführung zum Brennerraum ausgebildet sein und ermöglicht so eine besondere Verbrennungsluftvorwärmung.A further advantageous embodiment of the jet tube burner according to the invention is that the jacket tube is at least partially surrounded on the outside by an air-filled space which is circular in cross-section. The additional covering of the catalyst bed with an air-filled space acts as thermal insulation against the hot furnace atmosphere. In addition, this additional space can be designed as part of the air supply to the burner space and thus enables special combustion air preheating.

Der erfindungsgemäße Strahlrohrbrenner weist neben den mit ihm erreichten Verbesserungen des Betriebs von Wärmebehandlungsöfen auch ins Gewicht fallende konstruktive Vorteile auf, da er in einfachster Weise in alle Öfen eingebaut werden kann, die bereits mit normalen Strahlrohrbrennern zu Beheizungszwecken betrieben werden. Dieser Vorteil wird dadurch erreicht, daß als Mantelrohr für den erfindungsgemäßen Strahlrohrbrenner ein Mantelrohr eines bereits vorhandenen, zu Beheizungszwecken dienenden einfachen Strahlrohrbrenners benutzt wird. Aufgrund dieser Ausgestaltung des erfindungsgemäßen Strahlrohrbrenners, die auf seiner, in allen Varianten rationell durchdachten Bauweise beruhrt, wird es möglich, ein bereits vorhandenes Mantelrohr eines der der Beheizung dienenden einfachen Strahlrohrbrenner eines Ofens als Mantelrohr beizubehalten und alle anderen Teile in der Art eines kleineren kompletten Spezialstrahlrohrbrenners in das Mantelrohr einzubauen. Es ist deshalb mit dem erfindungsgemäßen Strahlrohrbrennern nicht notwendig, die bereits vorhandenen Öffnungen in der Ofenwand zu vergrößern.In addition to the improvements in the operation of heat treatment furnaces which it achieves, the radiant tube burner according to the invention also has significant structural advantages, since it can be installed in a simple manner in all furnaces which are already operated with normal radiant tube burners for heating purposes. This advantage is achieved in that a jacket tube of an already existing, simple jet tube burner serving for heating purposes is used as the jacket tube for the jet pipe burner according to the invention. Due to this design of the radiant tube burner according to the invention, which touches on its construction, which is rationally thought through in all variants, it becomes possible to keep an already existing casing tube of one of the simple radiant tube burners of a furnace used for heating as a casing tube and all other parts in the manner of a smaller, complete special radiant tube burner to be installed in the casing pipe. It is therefore not necessary with the radiant tube burner according to the invention to enlarge the openings already present in the furnace wall.

Weitere Ausgestaltungen der Erfindung werden anhand von den in den Figuren schematisch dargestellten Ausführungsbeispielen beschrieben.Further refinements of the invention are described with reference to the exemplary embodiments shown schematically in the figures.

Hierbei zeigt:

  • Figur 1 einen erfindungsgemäßen Strahlrohrbrenner mit einem Brennerrohr im Längsschnitt;
  • Figur 2 einen erfindungsgemäßen Strahlrohrbrenner mit mehreren Brennerrohren im Längsschnitt;
  • Figur 3 einen erfindungsgemäßen Strahlrohrbrenner mit zuätzlicher Luftisolierung.
Here shows:
  • Figure 1 shows a jet tube burner according to the invention with a burner tube in longitudinal section;
  • Figure 2 shows a jet tube burner according to the invention with several burner tubes in longitudinal section;
  • Figure 3 shows a radiant tube burner according to the invention with additional air insulation.

Gleiche Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen.Identical parts are provided with the same reference symbols in all figures.

In Figur 1 ist in der gemauerten Wand 1 eines Wärmebehandlungsofens über ein Stützrohr 2 einerseits und eine Halterung 3 andererseits ein Mantelrohr 4 eingebaut, das die äußere Umhüllung eines erfindungsgemäßen Strahlrohrbrenners bildet. Das Mantelrohr 4 kann dabei ein Mantelrohr eines Beheizungszwecken dienenden Strahlrohrbrenners sein, wie sie bei Öfen dieser Art in großer Anzahl bereits vorhanden sind. Dies hat den Vorteil, daß der erfindungsgemäße Strahlrohrbrenner ohne besonderen konstruktiven Aufwand, insbesondere ohne Vergrößerung der Durchtrittsöffnung in der Wand 1 des Ofens, in der Art eines kleinen kompletten Spezialstrahlrohrbrenners eingebaut werden kann.In FIG. 1, a jacket tube 4 is installed in the brick wall 1 of a heat treatment furnace via a support tube 2 on the one hand and a holder 3 on the other hand, and forms the outer casing of a jet tube burner according to the invention. The casing tube 4 can be a casing tube of a radiant tube burner for heating purposes, as is already available in large numbers in furnaces of this type. This has the advantage that the radiant tube burner according to the invention can be installed in the manner of a small, complete, special radiant tube burner without any particular design effort, in particular without enlarging the passage opening in the wall 1 of the furnace.

Im Inneren des Mantelrohres 4 befindet sich zunächst ein Innenrohr 5, das wiederum ein Luftzuführungsrohr 6 koaxial umgibt. Entlang der Längsachse des Strahlrohrbrenners schließlich ist ein Brennerrohr 7 angeordnet, das an seinem Ende eine Düse 8 aufweist.Inside the jacket tube 4 there is first an inner tube 5, which in turn coaxially surrounds an air supply tube 6. Finally, a burner tube 7 is arranged along the longitudinal axis of the jet pipe burner, which has a nozzle 8 at its end.

Der Zwischenraum zwischen dem Mantelrohr 4 und dem Inennrohr 5 ist mit einen Katalysatorbett 9 bis zu einem Gitter 10 gefüllt und mit einer Zuführung 11 für das Einsatzgas, aus dem das Behandlungsgas durch katalytische Umsetzung im Katalysatorbett 9 erzeugt wird, verbunden. Der Zwischenraum zwischen dem Mantelrohr 4 und dem Innenrohr 5 kann ganz oder teilweise mit dem Katalysatorbett 9 gefüllt sein. Das Katalysatorbett 9 kann je nach Anwendungsfall aus einem bestimmten Katalysator oder aus Mischungen oder Schichten verschiedener Katalysatoren bestehen.The space between the jacket tube 4 and the inner tube 5 is filled with a catalyst bed 9 up to a grid 10 and connected to a feed 11 for the feed gas, from which the treatment gas is generated by catalytic reaction in the catalyst bed 9. The space between the casing tube 4 and the inner tube 5 can be completely or partially filled with the catalyst bed 9. Depending on the application, the catalyst bed 9 can consist of a specific catalyst or of mixtures or layers of different catalysts.

Das Behandlungsgas verläßt das Katalysatorbett 9 durch Gasaustrittsöffnungen 12, die am Ende des Mantelrohrs 4 angebracht sind und in das Innere des Ofens führen. Der Innenraum des Luftzuführungsrohres 6 ist mit einer Luftzuführung 13 und das Brennerrohr 10 mit einer Brennergaszuführung 14 verbunden. Der Zwischenraum zwischen dem Innenrohr 5 und der Luftzuführung 6 dient als Abgasabführung und ist deshalb an seinem Ende mit einer Abgasleitung 15 verbunden. Im Zwischenraum zwischen dem Mantelrohr 4 und dem Innenrohr 5 befinden sich außerdem ein Temperaturfühler 16, in dem ein Thermoelement zur Abtastung der Temperatur im Katalysatorbett 9 verschiebbar untergebracht ist, sowie ein Analysenrohr 17, mit dem die Zusammensetzung des durch die Gasaustrittsöffnungen 12 in den Ofenraum austretenden Behandlungsgases überwacht werden kann.The treatment gas leaves the catalyst bed 9 through gas outlet openings 12 which are attached to the end of the casing tube 4 and lead into the interior of the furnace. The interior of the air supply pipe 6 is with a Air supply 13 and the burner tube 10 connected to a burner gas supply 14. The space between the inner tube 5 and the air supply 6 serves as exhaust gas discharge and is therefore connected at its end to an exhaust pipe 15. In the space between the casing tube 4 and the inner tube 5 there is also a temperature sensor 16 in which a thermocouple for sensing the temperature in the catalyst bed 9 is slidably accommodated, and an analysis tube 17 with which the composition of the gas outlet openings 12 exits into the furnace chamber Treatment gas can be monitored.

Erfindungsgemäß ist das Brennerrohr 7 in einer Stoffbuchse 18 entlang der Längsachse des Strahlrohrbrenners, z.B. mit Hilfe eines nicht dargestellten Motors, verschiebbar angeordnet, was in der Figur durch die gestrichelten Linien bei 7a angedeutet ist. Auf diese Weise kann die Wärme der im Bereich der Düse 8 brennenden Flamme gezielt an derjenigen Stelle des Katalysatorbetts 9 eingesetzt werden, wo sie im Hinblick auf die gewünschte Zusammensetzung des Behandlungsgases optimal gebraucht wird.According to the invention, the burner tube 7 is in a fabric bushing 18 along the longitudinal axis of the jet tube burner, e.g. with the help of a motor, not shown, arranged displaceably, which is indicated in the figure by the dashed lines at 7a. In this way, the heat of the flame burning in the area of the nozzle 8 can be used in a targeted manner at that point of the catalyst bed 9 where it is optimally used with regard to the desired composition of the treatment gas.

In der Wandung des Innenrohrs 5 sind Bohrungen 19 vorgesehen, die den Zwischenraum zwischen dem Innenrohr 5 und dem Luftzuführungsrohr 6 mit dem teilweise mit dem Katalysatorbett 9 gefüllten Zwischenraum zwischen dem Innenrohr 5 und dem Mantelrohr 4 verbinden. Durch die Bohrungen 19 kann Brennerabgas dem Behandlungsgas zugemischt und damit dessen Zusammensetzung gezielt verändert werden. Zusätzlich wird auf diese Weise sowohl dem Katalysatorbett 9 als auch dem Ofen selbst Wärme zugeführt, wodurch die Heizkosten des Ofens vermindert werden können. Die Bohrungen 19 münden im dargestellten Beispiel teilweise direkt in das Katalysatorbett 9, teilweise auch schon in den leeren Raum davor. Zur Steuerung der Zumischung des Brennerabgases zum Behandlungsgas ist in der Abgasleitung 15 ein Abgasventil 20 mit einer Drucküberwachung 21 vorgesehen, das beispielsweise mit dem Analysenrohr 17 im Wirkverbindung steht.Bores 19 are provided in the wall of the inner tube 5, which connect the intermediate space between the inner tube 5 and the air supply tube 6 with the intermediate space between the inner tube 5 and the jacket tube 4, which is partially filled with the catalyst bed 9. Burner exhaust gas can be mixed into the treatment gas through the bores 19 and the composition thereof can thus be specifically changed. In addition, heat is supplied to both the catalyst bed 9 and the furnace itself, which can reduce the heating costs of the furnace. In the example shown, the bores 19 partly open directly into the catalyst bed 9, partly even into the empty space in front of it. To control the admixture of the burner exhaust gas for the treatment gas, an exhaust valve 20 with a pressure monitor 21 is provided in the exhaust line 15, which is in operative connection with the analysis tube 17, for example.

Der dargestellte Strahlrohrbrenner wird mit Erdgas betrieben, das auch gleichzeitig Teil des Einsatzgases für die Herstellung des Behandlungsgases ist. Für den Brenner beträgt das Verhältnis von Erdgas zu Luft 1 : 10 bis 1 : 20, während dieses Verhältnis für das Einsatzgas zwischen 1 : 2,1 bis 1 : 2,6 genau geregelt wird. Wenn, wie erfindungsgemäß vorgesehen, diese Regelung über eine Zumischung von Brennerabgas durch die Bohrungen 19 hindurch erfolgt, kann eine gesonderte Regelung der Zusammensetzung des durch die Zuführung 11 eingeleiteten Einsatzgases entfallen.The jet tube burner shown is operated with natural gas, which is also part of the feed gas for the production of the treatment gas. The ratio of natural gas to air for the burner is 1:10 to 1:20, while this ratio for the feed gas is precisely regulated between 1: 2.1 to 1: 2.6. If, as provided in accordance with the invention, this regulation takes place via an admixture of burner exhaust gas through the bores 19, a separate regulation of the composition of the feed gas introduced through the feed 11 can be omitted.

In Figur 2 ist eine andere Ausgestaltungsform des erfindungsgemäßen Strahlrohrbrenners dargestellet, die sich von derjenigen der Figur 1 im wesentlichen dadurch unterscheidet, daß statt eines einzelnen Brennerrohres 7 (Figur 1) mehrere Brennerrohre 37 (Figur 2) vorgesehen sind, von denen zwei in der Figur 2 dargestellt sind. Die Brennerrohre 37, die auf einer gedachten Zylinderfläche koaxial zur Längsachse des Strahlrohrbrenners angeordnet sind, sind erfindungsgemäß jedes für sich parallel zur Längsachse des Strahlrohrbrenners in den Stopfbuchsen 48 verschiebbar, was durch die gestrichelten Linien bei 37a angedeutet ist. Zur Anpassung an diese dezentrale Anordnung der Brennerrohre 37 erfolgt bei dieser Ausgestaltungsform des Strahlrrohrbrenners die Luftzufuhr über ein Luftzuführungsrohr 36, das die Brennerrohre 37 bis nahe an deren Ende umgibt, während die Abführung des Brennerabgases über ein gesondertes Abgasrohr 52 vorgenommen wird, das entlang der Längsachse des Strahlrohrbrenners innerhalb der gedachten Zylinderfläche, auf der die Brennerrohre 37 liegen, angeordnet ist. Die auf den Brennerrohren 37 sitzenden Düsen sind als Dralldüsen 38 ausgebildet, die eine starke Verwirbelung der Brennerflamme und des Brennerabgases bewirken.FIG. 2 shows another embodiment of the jet tube burner according to the invention, which differs from that of FIG. 1 essentially in that instead of a single burner tube 7 (FIG. 1), several burner tubes 37 (FIG. 2) are provided, two of which are shown in the figure 2 are shown. The burner tubes 37, which are arranged on an imaginary cylinder surface coaxially to the longitudinal axis of the radiant tube burner, according to the invention can each be displaced parallel to the longitudinal axis of the radiant tube burner in the stuffing boxes 48, which is indicated by the dashed lines at 37a. To adapt to this decentralized arrangement of the burner tubes 37, in this embodiment of the jet tube burner, the air is supplied via an air supply tube 36 which surrounds the burner tubes 37 to close to the end thereof, while the burner exhaust gas is removed via a separate exhaust pipe 52 along the longitudinal axis the radiant tube burner within the imaginary cylinder surface on which the burner tubes 37 lie, is arranged. The nozzles seated on the burner tubes 37 are designed as swirl nozzles 38, which cause a strong swirling of the burner flame and the burner exhaust gas.

Die Beeinflussung der Zusammensetzung des Behandlungsgases durch Überleiten von Brennerabgas durch die Öffnungen 19 im Innenrohr 5 kann bei diesem Ausführungsbeispiel dadurch noch weiter variiert werden, daß einige der Öffnungen 19 an einer Stelle des Innenrohres 5 vorgesehen werden, die strömungsmäßig ganz oder teilweise noch im Bereich der unverbrauchten Verbrennungsluft liegt, d.h. außer dem Brennerabgas kann auch noch heiße Luft dem Einsatzgas zugemischt werden. Durch diese Maßnahme kann der Partialdruck von Kohlendioxid und Wasserdampf im Katalysatorbett 9 erhöht werden, was zu einer größeren Katalysatorausbeute führt und die Temperatur in der endothermen Reaktionszone erhöht. Eine Folge hiervon ist, daß das Katalysatorbett 9 auch bei niedriger Ofentemperatur betrieben werden kann.The influencing of the composition of the treatment gas by passing burner exhaust gas through the openings 19 in the inner tube 5 can be varied even further in this embodiment in that some of the openings 19 are provided at a location on the inner tube 5 which is wholly or partly still in terms of flow unused combustion air lies, ie In addition to the burner exhaust gas, hot air can also be added to the feed gas. This measure allows the partial pressure of carbon dioxide and water vapor in the catalyst bed 9 to be increased, which leads to a greater catalyst yield and increases the temperature in the endothermic reaction zone. One consequence of this is that the catalyst bed 9 can also be operated at a low furnace temperature.

In Figur 3 ist eine weitere Ausgestaltung des erfindungsgemäßen Strahlrohrbrenners angedeutet, wobei alle speziellen Bauteile, die in den Figuren 1 und 2 ausführlich dargestellt und erläutert sind, weggelassen worden sind. Bei dem in Figur 3 dargestellten Strahlrohrbrenner ist das Mantelrohr 4 von einem im Querschnitt kreisringförmigen Raum 60 umgeben, durch den Luft von der Eintrittsstelle 61 zu der Austrittsstelle 62 strömt. Diese Lufthülle im Raum 60 wirkt einerseits als Wärmeisolierung gegenüber dem Ofeninneren und andererseits, wenn sie Teil der Zuführung für die Verbrennungsluft ist, als Vorwärmraum für diese.A further embodiment of the jet tube burner according to the invention is indicated in FIG. 3, all special components, which are shown and explained in detail in FIGS. 1 and 2, being omitted. In the radiant tube burner shown in FIG. 3, the casing tube 4 is surrounded by a space 60 with an annular cross section through which air flows from the entry point 61 to the exit point 62. This air envelope in space 60 acts on the one hand as thermal insulation from the interior of the furnace and on the other hand, if it is part of the supply for the combustion air, as a preheating space for the latter.

Mit dieser Konstruktion werden die Wärmeverluste in den Ofenraum hinein verringert, da die Wärmestrahlung aus dem Katalysatorbett 9 nahezu halbiert wird und die Wärme, die vom Katalysatorbett in die Luftvorwärmung fließt, von der Luft aufgenommen und wieder dem Katalysatorbett 9 zugeführt wird. Dadurch, daß zusätzlich Wärme vom Ofenraum in die kalte Verbrennungsluft strömt, erhöht sich zudem die gesamte zugeführte Wärmemenge. Hierdurch kann entweder die Temperatur im Katalysatorbett 9 erhöht oder aber die durch den Brenner zugeführte Wärmemenge verringert werden.With this construction, the heat losses into the furnace chamber are reduced, since the heat radiation from the catalyst bed 9 is almost halved and the heat that flows from the catalyst bed into the air preheating is absorbed by the air and fed back to the catalyst bed 9. The fact that additional heat flows from the furnace chamber into the cold combustion air also increases the total amount of heat supplied. This can either increase the temperature in the catalyst bed 9 or reduce the amount of heat supplied by the burner.

Ein weiterer Vorteil dieser Ausgestaltung des erfindungsgemäßen Strahlrohrbrenners ist, daß die Temperatur im Katalysatorbett 9 sinkt, da es durch die kalte Verbrennungsluft gekühlt wird. Damit wird die Temperatur über die Länge gleichmäßiger und die Materialbeanspruchung geringer. Anstelle von Luft kann auch Brenngas durch die Vorwärmung geleitet werden.Another advantage of this embodiment of the jet tube burner according to the invention is that the temperature in the catalyst bed 9 drops because it is cooled by the cold combustion air. This makes the temperature more even over the length and the material stress less. Instead of air, fuel gas can also be passed through the preheating.

Claims (9)

1. Strahlrohrbrenner für Öfen zur Wärmebehandlung metallischer Werkstücke unter Einwirkung eines Behandlungsgases, das durch katalytische Umsetzung eines Einsatzgases erzeugt wird, mit einem Mantelrohr, das an seinem Ende Gasaustrittsöffnungen aufweist, einem koaxial mit Abstand zum Mantelrohr in diesem angeordneten Innenrohr, in dem mindestens ein Brennerrohr und ein Luftzuführungsrohr angeordnet sind, sowie mit einem Katalysatorbett, das den Zwischenraum zwischen Mantelrohr und Innenrohr mindestens teilweise ausfüllt, dadurch gekennzeichnet, daß mindestens ein Brennerrohr (7, 37) in Längsrichtung des Strahlrohrbrenners verschiebbar ist.1. jet tube burner for furnaces for the heat treatment of metallic workpieces under the action of a treatment gas, which is generated by the catalytic conversion of a feed gas, with a jacket tube that has gas outlet openings at its end, a coaxially arranged at a distance from the jacket tube in this inner tube, in which at least one burner tube and an air supply pipe are arranged, and with a catalyst bed which at least partially fills the space between the casing pipe and the inner pipe, characterized in that at least one burner pipe (7, 37) is displaceable in the longitudinal direction of the jet pipe burner. 2. Strahlrohr nach Anspruch 1 mit einem Brennerrohr, dadurch gekennzeichnet, daß das Brennerrohr (7) entlang der Längsachse des Strahlrohrbrenners angeordnet ist, das Luftzuführungsrohr (6) das Brennerrohr (7) koaxial umgibt und der Zwischenraum zwischen dem Innenrohr (5) und dem Luftzuführungsrohr (6) für die Abführung des Brennerabgases vorgesehen ist.2. Jet tube according to claim 1 with a burner tube, characterized in that the burner tube (7) is arranged along the longitudinal axis of the jet tube burner, the air supply tube (6) surrounds the burner tube (7) coaxially and the space between the inner tube (5) and the Air supply pipe (6) is provided for the discharge of the burner exhaust gas. 3. Strahlrohrbrenner nach Anspruch 1 mit mehreren Brennerrohren, dadurch gekennzeichnet, daß die Brennerrohre (37) auf einer gedachten Zylinderfläche koaxial zur Längsachse des Strahlrohrbrenners angeordnet sind, das Luftführungsrohr (36) koaxial die gedachte Zylinderfläche mindestens teilweise umgibt und ein Abgasrohr (52) entlang der Längsachse des Strahlrohrbrenners innerhalb der gedachten Zylinderfläche angeordnet ist.3. radiant tube burner according to claim 1 with a plurality of burner tubes, characterized in that the burner tubes (37) are arranged on an imaginary cylinder surface coaxially to the longitudinal axis of the radiant tube burner, the air guide tube (36) coaxially surrounds the imaginary cylinder surface at least partially and an exhaust pipe (52) along the longitudinal axis of the radiant tube burner is arranged within the imaginary cylinder surface. 4. Strahlrohrbrenner nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Innenrohr (5) Bohrungen (19) aufweist, die den Innenraum des Innenrohrs (5) durch die Wandung des Innenrohrs (5) hindurch mit dem Zwischenraum zwischen dem Mantelrohr (4) und dem Innenrohr (5) verbinden.4. jet tube burner according to one of claims 1 to 3, characterized in that the inner tube (5) has bores (19) which the interior of the inner tube (5) through the wall of the inner tube (5) with the space between the jacket tube ( 4) and the inner tube (5). 5. Strahlrohrbrenner nach Anspruch 4, dadurch gekennzeichnet, daß in der den Strahlrohrbrenner verlassenden Abgasleitung (15) ein Abgasventil (20) angeordnet ist.5. A radiant tube burner according to claim 4, characterized in that an exhaust valve (20) is arranged in the exhaust pipe (15) leaving the radiant tube burner. 6. Strahlrohrbrenner nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß das Katalysatorbett (9) den Zwischenraum zwischen dem Mantelrohr (4) und dem Innenrohr (5) nur teilweise ausfüllt und die Bohrungen (19) des Innenrohrs (5) in den Katalysatorfreien und/oder in den mit Katalysator gefüllten Teil des Zwischenraums münden.6. jet tube burner according to claim 4 or 5, characterized in that the catalyst bed (9) only partially fills the space between the jacket tube (4) and the inner tube (5) and the bores (19) of the inner tube (5) in the catalyst-free and / or open into the part of the intermediate space filled with catalyst. 7. Strahlrohrbrenner nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Brennerrohr (7) oder die Brennerrohre (37) an ihrem Ende Dralldüsen (38) aufweisen.7. jet tube burner according to one of claims 1 to 6, characterized in that the burner tube (7) or the burner tubes (37) have swirl nozzles (38) at their end. 8. Strahlrohrbrenner nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Mantelrohr (4) auf seiner Außenseite mindestens teilweise von einem luftgefüllten, im Querschnitt kreisringförmigen Raum (60) umgeben ist.8. radiant tube burner according to one of claims 1 to 7, characterized in that the jacket tube (4) is at least partially surrounded on its outside by an air-filled, annular in cross-section space (60). 9. Wärmebehandlungsofen mit einem oder mehreren Strahlrohrbrennern nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der oder die Strahlrohrbrenner die gleichen Mantelrohre (4) besitzen, wie sie die der Beheizung des Ofens dienenden Strahlrohrbrenner aufweisen.9. Heat treatment furnace with one or more radiant tube burners according to one or more of claims 1 to 8, characterized in that the one or more radiant tube burners have the same casing tubes (4) as they have the radiant tube burners used for heating the furnace.
EP87112805A 1986-09-25 1987-09-02 Radiant tube burner comprising a catalyst bed for a heat treatment furnace Expired - Lifetime EP0261462B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87112805T ATE60366T1 (en) 1986-09-25 1987-09-02 RADIAL TUBE BURNER WITH CATALYST BED FOR HEAT TREATMENT FURNACES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863632577 DE3632577A1 (en) 1986-09-25 1986-09-25 JET PIPE BURNER WITH CATALYST BED FOR HEAT TREATMENT OVENS
DE3632577 1986-09-25

Publications (3)

Publication Number Publication Date
EP0261462A2 true EP0261462A2 (en) 1988-03-30
EP0261462A3 EP0261462A3 (en) 1988-07-27
EP0261462B1 EP0261462B1 (en) 1991-01-23

Family

ID=6310325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112805A Expired - Lifetime EP0261462B1 (en) 1986-09-25 1987-09-02 Radiant tube burner comprising a catalyst bed for a heat treatment furnace

Country Status (4)

Country Link
EP (1) EP0261462B1 (en)
AT (1) ATE60366T1 (en)
DE (2) DE3632577A1 (en)
ES (1) ES2020979B3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435033A1 (en) * 1989-12-23 1991-07-03 Linde Aktiengesellschaft Method for providing and distributing treatment gases for heat treatments
EP0458183A2 (en) * 1990-05-19 1991-11-27 Linde Aktiengesellschaft Method for making available treatment gases for heat treatments
EP0695807A1 (en) * 1994-08-03 1996-02-07 Linde Aktiengesellschaft Process for heat treating especially carburizing, metallic workpieces
FR2791419A1 (en) * 1999-03-25 2000-09-29 Sunkiss Aeronautique SURFACE EMISSION EQUIPMENT OF INFRARED RADIATION, OF THE TUNNEL TYPE, INCLUDING CATALYTIC COMBUSTION DEVICES

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008029001B3 (en) 2008-06-20 2009-09-17 Ipsen International Gmbh Method and device for the heat treatment of metallic materials
DE102009038598B4 (en) 2009-08-26 2017-06-22 Ipsen International Gmbh Process and device for the treatment of process gases for heat treatment of metallic materials / workpieces in industrial furnaces

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1231064A (en) * 1959-02-23 1960-09-26 Fours Ripoche Radiant tube for ovens
FR2115558A5 (en) * 1970-11-24 1972-07-07 Bark Semen Radiant furnace tube - of gas-fired, closed construction - has improved burner to reduce sooting
GB1306773A (en) * 1971-04-14 1973-02-14 Vnii Elektrotermicheskogo Obor Apparatus for preparing a controlled exothermic atmosphere
DE2758024A1 (en) * 1977-03-28 1978-10-12 Thaelmann Schwermaschbau Veb Shielding gas generator for heat treatment furnaces - is cracker with tubular housing with catalyst held in furnace chamber
JPS61516A (en) * 1984-06-12 1986-01-06 Toyo Rokougiyou Kk Atmospheric gas generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1231064A (en) * 1959-02-23 1960-09-26 Fours Ripoche Radiant tube for ovens
FR2115558A5 (en) * 1970-11-24 1972-07-07 Bark Semen Radiant furnace tube - of gas-fired, closed construction - has improved burner to reduce sooting
GB1306773A (en) * 1971-04-14 1973-02-14 Vnii Elektrotermicheskogo Obor Apparatus for preparing a controlled exothermic atmosphere
DE2758024A1 (en) * 1977-03-28 1978-10-12 Thaelmann Schwermaschbau Veb Shielding gas generator for heat treatment furnaces - is cracker with tubular housing with catalyst held in furnace chamber
JPS61516A (en) * 1984-06-12 1986-01-06 Toyo Rokougiyou Kk Atmospheric gas generator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 139 (C-348)[2196], 22. mai 1986; & JP-A-61 000 516 (TOUYOU ROKOUGIYOU K.K.) 06-01-1986 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435033A1 (en) * 1989-12-23 1991-07-03 Linde Aktiengesellschaft Method for providing and distributing treatment gases for heat treatments
EP0458183A2 (en) * 1990-05-19 1991-11-27 Linde Aktiengesellschaft Method for making available treatment gases for heat treatments
EP0458183A3 (en) * 1990-05-19 1992-04-01 Linde Aktiengesellschaft Method for making available treatment gases for heat treatments
US5160380A (en) * 1990-05-19 1992-11-03 Linde Aktiengesellschaft Process for improved preparation of treatment gas in heat treatments
EP0695807A1 (en) * 1994-08-03 1996-02-07 Linde Aktiengesellschaft Process for heat treating especially carburizing, metallic workpieces
FR2791419A1 (en) * 1999-03-25 2000-09-29 Sunkiss Aeronautique SURFACE EMISSION EQUIPMENT OF INFRARED RADIATION, OF THE TUNNEL TYPE, INCLUDING CATALYTIC COMBUSTION DEVICES
WO2000058678A1 (en) * 1999-03-25 2000-10-05 Sunkiss Tunnel type heating equipment for surface transmission of infrared radiation
JP2002540378A (en) * 1999-03-25 2002-11-26 サンキス Tunnel type heating device by infrared surface radiation
US6494712B1 (en) 1999-03-25 2002-12-17 Sunkiss Tunnel type heating equipment for surface transmission of infrared radiation

Also Published As

Publication number Publication date
EP0261462A3 (en) 1988-07-27
DE3632577A1 (en) 1988-05-05
ATE60366T1 (en) 1991-02-15
ES2020979B3 (en) 1991-10-16
EP0261462B1 (en) 1991-01-23
DE3767626D1 (en) 1991-02-28

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