EP0458183A2 - Method for making available treatment gases for heat treatments - Google Patents

Method for making available treatment gases for heat treatments Download PDF

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Publication number
EP0458183A2
EP0458183A2 EP91107868A EP91107868A EP0458183A2 EP 0458183 A2 EP0458183 A2 EP 0458183A2 EP 91107868 A EP91107868 A EP 91107868A EP 91107868 A EP91107868 A EP 91107868A EP 0458183 A2 EP0458183 A2 EP 0458183A2
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EP
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Prior art keywords
catalyst
retort
furnace
treatment gas
catalyst retort
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EP91107868A
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German (de)
French (fr)
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EP0458183A3 (en
EP0458183B1 (en
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Peter Dr.-Ing. Vocke
Reinhard Dipl.-Ing. Strigl
Thomas Dipl.-Ing. Mahlo
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Linde GmbH
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Linde GmbH
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    • 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 method for providing treatment gas in heat treatments, the treatment gas being generated in a catalyst retort which is arranged in an associated furnace and is at furnace temperature, and a corresponding device.
  • the object of the present invention results from this background and consists in improving a method according to the preamble of claim 1 and known catalyst retorts so that the usability in the direction of lower operating temperatures in heat treatments is expanded.
  • the catalyst retort which is to be arranged implicitly in the furnace is surrounded in the furnace by a shield, the treatment gas emerging from the catalyst retort being first introduced into the shield and only then being released into the furnace space.
  • the catalyst retort is isolated from the gas atmosphere in the furnace interior by the fact that the freshly generated treatment gas is temporarily held in the shielded, enveloped catalyst retort.
  • a higher degree of heating of the catalyst mass in the catalyst retort can be maintained even at furnace temperatures below 750 ° C., so that the complete conversion of the feed gas into the treatment gas remains guaranteed.
  • the heating output can be set lower than without shielding.
  • An advantageous embodiment of the invention for the frequently occurring tubular catalyst retorts derived from a radiant heater tube is that they are surrounded by a likewise essentially tubular shield (11) which surrounds the catalyst retort at a distance, the treatment gas before it is introduced into the interior of the furnace is routed as far as possible within the shield.
  • a device according to the invention with an essentially tubular catalyst retort with jacket tube, heating, catalyst material and gas supply and discharge devices as well as gas outlet openings for the treatment gas generated is characterized in that with the substantially tubular actual catalyst retort, a cladding tube (11) or other profile which is selected in cross section is connected such that the catalyst retort is arranged approximately coaxially and centered in this cladding tube or profile this results in a free space (14) surrounding the catalyst retort, the cladding tube or profile being equipped with passage openings for the treatment gas trapped therein.
  • a particularly advantageous embodiment is that the passage openings (15) are arranged in the cladding tube or profile in such a way that the flow path of the newly formed treatment gas in the cladding tube or profile is as long as possible.
  • This configuration ensures that the treatment gas which is at a higher temperature level and which emerges freshly from the catalyst retort remains in the vicinity of the retort for as long as possible and is thus kept at a higher temperature level.
  • the figure shows a device according to the invention installed between two walls 6, 7 of a heat treatment system, with a catalyst retort 1, internal heating 2 and a shielding cladding tube 11.
  • the essentially tubular catalyst retort 1 is equipped with a feed line 8 for the feed gas, which, for example, consists of a mixture Natural gas and air can be.
  • the internal volume of retort 1 is largely with Filled catalyst material 9, which ensures the conversion of the feed gas into the treatment gas.
  • outlet openings 10 are provided for the converted gas.
  • the feed gas passes through the catalyst material 9 located in the catalyst retort and exits the retort as treatment gas through the gas outlet openings 10.
  • the internal heating 2 is arranged centrally in the catalyst retort, which can consist of a burner with fuel gas mixture supply 16 and exhaust gas line 17.
  • the entire catalyst retort 1 is surrounded by the cladding tube 11 and is fastened coaxially and centered therein with a strut cross 12 and a flange 13. Because of the larger, cheap about 1.1 to twice the diameter of the cladding tube, there is a free space 14 between the catalyst retort and the cladding tube. Passage openings 15 are provided in the cladding tube 11 approximately at the opposite end to the end at which the gas outlet openings 10 are located on the retort itself. As a result, almost the entire length of the outside of the retort is only in contact with fresh, newly created, warmer treatment gas that flows in continuously.
  • the sequence according to the invention is now as follows: If heat treatment is to be carried out at temperatures, for example around 750 ° C, under protective gas, e.g. an annealing treatment of metallic workpieces, whereby the heat treatment system can be a continuous furnace, then the problems described at the outset occur in a conventional design with the protective gas generation via catalyst retorts. incomplete conversion of the feed gas into treatment gas and risk of burning if the heating output is too high. Under Using the method according to the invention and the device, however, it is possible to provide treatment gas without problems.
  • protective gas e.g. an annealing treatment of metallic workpieces
  • a heating of the catalyst material in the retort is achieved at an approximately 10 to 20% higher level than if a catalyst retort were used without the jacket tube 11 essential to the invention.
  • the natural gas-air feed gas flows through the feed line 8 in the cold state of the catalyst mass 9 and converts there after heating in, for example, CO / H2 / N2-containing treatment gas, which passes through the gas outlet openings 10 at the top of the catalyst retort 1 the cladding tube 11 flows into shielded free space 14.
  • the treatment gas flows to the foot end of the catalyst retort in this shielded free space, since the through bores 15 of the cladding tube 11 are located there. Through this, the treatment gas finally enters the furnace interior. In this way, thermal insulation of the catalyst retort towards the furnace interior is achieved, as a result of which the above-mentioned increase in the temperature level in the catalyst retort and thus an objective essential to the invention is achieved.
  • a further, additional advantage is that the procedure according to the invention or the implementation of the invention in terms of the device results in the possibility that the replacement of a catalyst retort can be considerably simplified. If the device according to the invention is designed so that the cladding tube 11 is connected to the catalyst retort 1, for example on the flange 13 by a releasable screw connection 18, while the front end of the catalyst retort is only loosely lying on the support cross 12 in the cladding tube 11 is held, the catalyst retort can be replaced practically while the treatment furnace is in operation, since the cladding tube 11 remains in the furnace and the latter is therefore still essentially closed. Thus, the catalyst retort is very easy to replace when the furnace is heated, which reduces costs for this type of operation.
  • the method according to the invention thus provides an expansion of the possible uses of treatment gas generation with catalyst retorts, which can be desired and advantageous in a number of practical cases, with additional progress being made with regard to the maintenance and repair friendliness of a heat treatment system.

Abstract

The invention relates to a process and apparatus for preparation of treatment gas used in heat treatments, whereby the treatment gas is produced in a furnace disposed catalyst retort at a temperature of that of the furnace in which the retort is positioned. With such processes, when using lower furnace temperature ranges, problems occur with respect to the reaction of the feed gas in the catalyst retort. To provide an improvement, the catalyst retort in the furnace is surrounded by a shield, and the treatment gas generated in and leaving the catalyst retort is first fed into a space defined by this shield and thereafter released into furnace space. By this, an isolation of the catalyst retort from the interior of the furnace is provided, and relatively higher retort temperatures are available.

Description

Die Erfindung betrifft ein verfahren zur Bereitstellung von Behandlungsgas bei Wärmebehandlungen, wobei das Behandlungsgas in einer in einem zugehörigen Ofen angeordneten, unter Ofentemperatur stehenden Katalysatorretorte erzeugt wird sowie eine entsprechende Vorrichtung.The invention relates to a method for providing treatment gas in heat treatments, the treatment gas being generated in a catalyst retort which is arranged in an associated furnace and is at furnace temperature, and a corresponding device.

Es sind eine Mehrzahl von Wärmebehandlungsverfahren und dabei insbesondere Wärmebehandlungen für metallische Werkstücke bekannt, die mit einer in den heißen Bereichen eines Wärmebehandlungsofens untergebrachten Katalysatorretorte zur Behandlungsgaserzeugung (Schutz oder Reaktionsgase) arbeiten (siehe z.B. DE-OS 36 30 833). Diesen Retorten wird im Betrieb ein Einsatzgas zugeführt, daß sich in diesen aufgrund des dort befindlichen Katalysators und des vorhandenen Temperaturniveaus aus der Ofenumgebung in das gewünschte Behandlungsgas umsetzt. Das dabei im Katalysatormaterial der Retorte sich bildende Behandlungsgas fließt dann direkt aus der Retorte in den Ofeninnenraum. Bei Wärmebehandlungen mit Temperaturen unter 800 °C Umgebungstemperatur für die Kataylsatorretorte beginnen jedoch aufgrund des relativ niedrigen Temperaturniveaus Probleme bei der vollständigen Umsetzung des Einsatzgases. Diese lassen sich bei selbstbeheizten Katalysatorretorten durch Erhöhung der Leistung eines innenseitig und benachbart zum Katalysatormaterial angeordneten Brenners in einem gewissen Rahmen wieder beheben. Ab einer gewissen unteren Grenztemperatur, ca. 750 °C, wird jedoch die Durchwärmung der Katalysatormasse wegen eines zu großen Wärmeabflusses an den "zu kalten" Ofenraum ungenügend, wobei dann wiederum eine nicht mehr ausreichende Umsetzung des Einsatzgases im Behandlungsgas die Folge ist. Andererseits ist bei weiterer Erhöhung der Beheizungsleistung die Gefahr des Durchbrennens der Katalysatorretorte gegeben, die in der Regel als Rohr mit außenseitig angeordneten Katalysatormaterial und innenseitigem Beheizungsbrenner ausgebildet ist. Derartige rohrförmige, mit einer Eigenbeheizung ausgestattete Katalysatorretorten sind z.B. der DE-OS 27 58 024 oder DE-OS 36 32 577 zu entnehmen.There are a number of heat treatment processes, and in particular heat treatments for metallic workpieces, which work with a catalyst retort for treatment gas generation (protective or reaction gases) housed in the hot areas of a heat treatment furnace (see, for example, DE-OS 36 30 833). A feed gas is supplied to these retorts during operation, which, due to the catalyst located there and the temperature level present, converts them into the desired treatment gas. The one that forms in the catalyst material of the retort Treatment gas then flows directly from the retort into the furnace interior. With heat treatments with temperatures below 800 ° C ambient temperature for the catalyst retort, however, problems start with the complete conversion of the feed gas due to the relatively low temperature level. With self-heated catalyst retorts, this can be remedied to a certain extent by increasing the output of a burner arranged on the inside and adjacent to the catalyst material. Above a certain lower limit temperature, approx. 750 ° C., however, the heating of the catalyst mass becomes insufficient because the heat flow to the “too cold” furnace space is too great, which in turn results in an insufficient conversion of the feed gas into the treatment gas. On the other hand, if the heating output is increased further, there is a risk of the catalyst retort burning, which is usually designed as a tube with catalyst material arranged on the outside and an internal heating burner. Such tubular catalyst retorts equipped with self-heating can be found, for example, in DE-OS 27 58 024 or DE-OS 36 32 577.

Bei solchen Katalysatorretorten besteht darüber hinaus das Problem, daß im Falle der Notwendigkeit einer Auswechslung eine vorübergehende Ofenabschaltung erfolgen muß.In such catalyst retorts there is also the problem that if the need for replacement is required, the furnace must be switched off temporarily.

Die Aufgabenstellung der vorliegenden Erfindung ergibt sich aus diesem Hintergrund und besteht darin, ein Verfahren gemäß dem Oberbegriff des Anspruchs 1 sowie bekannte Katalysatorretorten so zu verbessern, daß die Einsetzbarkeit in Richtung niedrigerer Betriebstemperaturen bei Wärmebehandlungen erweitert wird.The object of the present invention results from this background and consists in improving a method according to the preamble of claim 1 and known catalyst retorts so that the usability in the direction of lower operating temperatures in heat treatments is expanded.

Diese Aufgabe wird dadurch gelöst, daß die verfahrensimplizit im Ofen anzuordnende Katalysatorretorte im Ofen von einer Abschirmung umgeben wird, wobei das aus der Katalysatorretorte austretende Behandlungsgas zuerst in die Abschirmung eingeleitet wird und erst dann in den Ofenraum entlassen wird.This object is achieved in that the catalyst retort which is to be arranged implicitly in the furnace is surrounded in the furnace by a shield, the treatment gas emerging from the catalyst retort being first introduced into the shield and only then being released into the furnace space.

Mit dieser Maßnahme ergibt sich eine Isolierung der Katalysatorretorte gegenüber der im Ofeninnenraum befindlichen Gasatmosphäre, dadurch, daß das frisch entstandene Behandlungsgas in der abgeschirmten, eingehüllten Katalysatorretorte zwischenzeitlich gehalten wird. In der Folge kann auch bei Ofentemperaturen unter 750 °C eine höhere Durchwärmung der Katalysatormasse in der Katalysatorretorte aufrechterhalten werden, wodurch die vollständige Umsetzung des Einsatzgases in Behandlungsgas auch dann gewährleistet bleibt. Eine Durchbrenngefahr der Katalysatorretorte ist dabei ausgeschlossen, da die Beheizungsleistung geringer als ohne Abschirmung einzustellen ist.With this measure, the catalyst retort is isolated from the gas atmosphere in the furnace interior by the fact that the freshly generated treatment gas is temporarily held in the shielded, enveloped catalyst retort. As a result, a higher degree of heating of the catalyst mass in the catalyst retort can be maintained even at furnace temperatures below 750 ° C., so that the complete conversion of the feed gas into the treatment gas remains guaranteed. There is no risk of the catalyst retort burning out, since the heating output can be set lower than without shielding.

Eine vorteilhafte Ausgestaltung der Erfindung besteht für die häufig vorkommenden, rohrförmigen, von einem Beheizungsstrahlrohr abgeleiteten Katalysatorretorten darin, daß diese mit einer ebenfalls im wesentlichen rohrförmigen Abschirmung (11) umgeben werden, die die Katalysatorretorte mit einem Abstand umfaßt, wobei das Behandlungsgas vor seiner Einleitung in den Ofeninnenraum eine möglichst lange Strecke innerhalb der Abschirmung geführt wird.An advantageous embodiment of the invention for the frequently occurring tubular catalyst retorts derived from a radiant heater tube is that they are surrounded by a likewise essentially tubular shield (11) which surrounds the catalyst retort at a distance, the treatment gas before it is introduced into the interior of the furnace is routed as far as possible within the shield.

Eine Vorrichtung gemäß der Erfindung mit einer im wesentlichen rohrföhrmigen Katalysatorretorte mit Mantelrohr, Beheizung, Katalysatormaterial und Gaszufuhr- und -abfuhreinrichtungen sowie Gasaustrittsöffnungen für das erzeugte Behandlungsgas zeichnet sich dadurch aus, daß mit der im wesentlichen rohrföhrmigen eigentlichen Katalysatorretorte ein im Querschnitt so gewähltes Hüllrohr (11) oder sonstiges Profil verbunden ist, daß die Katalysatorretorte in diesem Hüllrohr oder Profil etwa koaxial und zentriert angeordnet ist und sich dabei ein die Katalysatorretorte umgebender Freiraum (14) ergibt, wobei das Hüllrohr oder Profil mit Durchtrittsöffnungen für das in ihr aufgefangene Behandlungsgas ausgestattet ist.A device according to the invention with an essentially tubular catalyst retort with jacket tube, heating, catalyst material and gas supply and discharge devices as well as gas outlet openings for the treatment gas generated is characterized in that with the substantially tubular actual catalyst retort, a cladding tube (11) or other profile which is selected in cross section is connected such that the catalyst retort is arranged approximately coaxially and centered in this cladding tube or profile this results in a free space (14) surrounding the catalyst retort, the cladding tube or profile being equipped with passage openings for the treatment gas trapped therein.

Eine besonders vorteilhafte Ausgestaltung besteht darin, daß die Durchtrittsöffnungen (15) im Hüllrohr oder Profil so angeordnet sind, daß sich ein möglichst langer Strömungsweg des neu entstandenen Behandlungsgases im Hüllrohr oder Profil ergibt. Mit dieser Ausgestaltung wird erreicht, daß das auf einem höheren Temperaturniveau befindliche, frisch aus der Katalysatorretorte austretende Behandlungsgas möglichst lange in Retortennähe bleibt und diese somit auf einem höheren Temperaturniveau gehalten wird.A particularly advantageous embodiment is that the passage openings (15) are arranged in the cladding tube or profile in such a way that the flow path of the newly formed treatment gas in the cladding tube or profile is as long as possible. This configuration ensures that the treatment gas which is at a higher temperature level and which emerges freshly from the catalyst retort remains in the vicinity of the retort for as long as possible and is thus kept at a higher temperature level.

Im folgenden soll die Erfindung anhand der schematischen Schnittfigur, die eine erfindungsgemäße Katalysatorretorte zeigt, beispielhaft näher beschrieben werden.In the following, the invention will be described in more detail by way of example using the schematic sectional figure which shows a catalyst retort according to the invention.

Die Figur zeigt eine zwischen zwei Wände 6, 7 einer Wärmebehandlungsanlage installierte, erfindungsgemäße Einrichtung mit einer Katalysatorretorte 1, Innenbeheizung 2 und einem abschirmenden Hüllrohr 11. Die im wesentlichen rohrförmige Katalysatorretorte 1 ist mit einer Zuleitung 8 für das Einsatzgas ausgestattet, welches beispielsweise ein Gemisch aus Erdgas und Luft sein kann. Das Innenvolumen der Retorte 1 ist zu einem großen Teil mit Katalysatormaterial 9 gefüllt, das für die Umsetzung des zugeführten Einsatzgases in Behandlungsgas sorgt. An dem der Zuleitung 8 gegenüberliegenden Ende der Retorte 1 sind Austrittsöffnungen 10 für das umgesetzte Gas vorgesehen. Das Einsatzgas durchläuft im Betrieb das in der Katalysatorretorte befindliche Katalysatormaterial 9 und tritt als Behandlungsgas durch die Gasaustrittsöffnungen 10 wieder aus der Retorte aus. Die Innenbeheizung 2 ist zentral in der Katalysatorretorte angeordnet, wobei diese aus einem Brenner mit Brenngasgemischzufuhr 16 und Abgasleitung 17 bestehen kann. Die gesamte Katalysatorretorte 1 wird von dem Hüllrohr 11 umgeben und ist in diesem mit einem Strebenkreuz 12 und einem Flansch 13 koaxial und zentriert befestigt. Dabei ergibt sich aufgrund des größeren, günstig etwa 1.1 bis zweifachen Durchmessers des Hüllrohres ein Freiraum 14 zwischen Katalysatorretorte und Hüllrohr. Im Hüllrohr 11 sind etwa am entgegengesetzten Ende zu dem Ende, an dem sich die Gasaustrittöffnungen 10 an der Retorte selbst befinden, Durchtrittsöffnungen 15 angebracht. Dadurch steht die Außenseite der Retorte fast auf der gesamten Länge nur mit ständig neu zufließendem, frisch entstandenen, wärmeren Behandlungsgas in Berührung.The figure shows a device according to the invention installed between two walls 6, 7 of a heat treatment system, with a catalyst retort 1, internal heating 2 and a shielding cladding tube 11. The essentially tubular catalyst retort 1 is equipped with a feed line 8 for the feed gas, which, for example, consists of a mixture Natural gas and air can be. The internal volume of retort 1 is largely with Filled catalyst material 9, which ensures the conversion of the feed gas into the treatment gas. At the end of the retort 1 opposite the feed line 8, outlet openings 10 are provided for the converted gas. During operation, the feed gas passes through the catalyst material 9 located in the catalyst retort and exits the retort as treatment gas through the gas outlet openings 10. The internal heating 2 is arranged centrally in the catalyst retort, which can consist of a burner with fuel gas mixture supply 16 and exhaust gas line 17. The entire catalyst retort 1 is surrounded by the cladding tube 11 and is fastened coaxially and centered therein with a strut cross 12 and a flange 13. Because of the larger, cheap about 1.1 to twice the diameter of the cladding tube, there is a free space 14 between the catalyst retort and the cladding tube. Passage openings 15 are provided in the cladding tube 11 approximately at the opposite end to the end at which the gas outlet openings 10 are located on the retort itself. As a result, almost the entire length of the outside of the retort is only in contact with fresh, newly created, warmer treatment gas that flows in continuously.

Der erfindungsgemäße Ablauf ist nun wie folgt:
Ist eine Wärmebehandlung bei Temperaturen, beispielsweise um 750 °C unter Schutzgas durchzuführen, z.B. eine Glühbehandlung von metallischen Werkstücken, wobei es sich bei der Wärmebehandlungsanlage um einen Durchlaufofen handeln kann, so treten in konventioneller Ausführung mit der Schutzgaserzeugung über Katalysatorretorten die eingangs erläuterten Probleme auf - unvollständige Umsetzung des Einsatzgases in Behandlungsgas und Gefahr des Durchbrennens bei zu hoher Beheizungsleistung. Unter Anwendung des erfindungsgemäßen Verfahrens sowie der Vorrichtung ist jedoch eine problemlose Bereitstellung von Behandlungsgas möglich. Mit etwa gleichbleibender Heizleistung der Eigenbeheizung der Katalysatorretorte wird erfindungsgemäß nämlich eine Durchwärmung des Katalysatormaterials in der Retorte auf einem etwa 10 bis 20 % höheren Niveau erreicht, als wenn eine Katalysatorretorte ohne das erfindungswesentliche Hüllrohr 11 eingesetzt würde. Das Erdgas-Luft-Einsatzgas fließt über die Zuleitung 8 in kaltem Zustand der Katalysatormasse 9 zu und setzt sich dort nach Erwärmung in beispielsweise CO/H₂/N₂-haltiges Behandlungsgas um, das über die Gasaustrittsöffnungen 10 an der Spitze der Katalysatorretorte 1 in den durch das Hüllrohr 11 abgeschirmten Freiraum 14 einfließt. In diesem abgeschirmten Freiraum fließt das Behandlungsgas zum Fußende der Katalysatorretorte, da sich dort die Durchgangsbohrungen 15 des Hüllrohres 11 befinden. Durch diese tritt das Behandlungsgas schließlich in den Ofeninnenraum ein. Auf diese Weise wird eine Wärmeisolierung der Katalysatorretorte zum Ofeninnenraum hin erreicht, wodurch die obengenannte Erhöhung des Temperaturniveaus in der Katalysatorretorte und somit ein erfindungswesentliches Ziel erreicht ist.The sequence according to the invention is now as follows:
If heat treatment is to be carried out at temperatures, for example around 750 ° C, under protective gas, e.g. an annealing treatment of metallic workpieces, whereby the heat treatment system can be a continuous furnace, then the problems described at the outset occur in a conventional design with the protective gas generation via catalyst retorts. incomplete conversion of the feed gas into treatment gas and risk of burning if the heating output is too high. Under Using the method according to the invention and the device, however, it is possible to provide treatment gas without problems. With approximately constant heating power of the self-heating of the catalyst retort, according to the invention, a heating of the catalyst material in the retort is achieved at an approximately 10 to 20% higher level than if a catalyst retort were used without the jacket tube 11 essential to the invention. The natural gas-air feed gas flows through the feed line 8 in the cold state of the catalyst mass 9 and converts there after heating in, for example, CO / H₂ / N₂-containing treatment gas, which passes through the gas outlet openings 10 at the top of the catalyst retort 1 the cladding tube 11 flows into shielded free space 14. The treatment gas flows to the foot end of the catalyst retort in this shielded free space, since the through bores 15 of the cladding tube 11 are located there. Through this, the treatment gas finally enters the furnace interior. In this way, thermal insulation of the catalyst retort towards the furnace interior is achieved, as a result of which the above-mentioned increase in the temperature level in the catalyst retort and thus an objective essential to the invention is achieved.

Als weiterer, sich zusätzlich ergebender Vorteil erweist sich, daß sich bei der erfindungsgemäße Verfahrensweise bzw. bei der vorrichtungsmäßigen Realisierung der Erfindung die Möglichkeit ergibt, daß die Auswechslung einer Katalysatorretorte wesentlich vereinfacht werden kann. Wird nämlich die erfindungsgemäße Vorrichtung so gestaltet, daß das Hüllrohr 11 beispielsweise am Flansch 13 durch eine lösbare Schraubenverbindung 18 mit der Katalysatorretorte 1 verbunden ist, während das vordere Ende der Katalysatorretorte nur lose auf dem Stützkreuz 12 liegend im Hüllrohr 11 gehalten wird, so kann eine Auswechslung der Katalysatorretorte praktisch im laufenden Betrieb des Behandlungsofens erfolgen, da währenddessen das Hüllrohr 11 im Ofen verbleibt und dieser somit weiterhin im wesentlichen geschlossen ist. Somit ist die Katalysatorretorte auf sehr einfache Weise bei aufgeheiztem Ofen austauschbar, was Kostenaufwendungen für diesen Betriebsfall senkt.A further, additional advantage is that the procedure according to the invention or the implementation of the invention in terms of the device results in the possibility that the replacement of a catalyst retort can be considerably simplified. If the device according to the invention is designed so that the cladding tube 11 is connected to the catalyst retort 1, for example on the flange 13 by a releasable screw connection 18, while the front end of the catalyst retort is only loosely lying on the support cross 12 in the cladding tube 11 is held, the catalyst retort can be replaced practically while the treatment furnace is in operation, since the cladding tube 11 remains in the furnace and the latter is therefore still essentially closed. Thus, the catalyst retort is very easy to replace when the furnace is heated, which reduces costs for this type of operation.

Neben der Hauptidee der Erfindung, nämlich quasi eine Isolierschicht zwischen einer in einem Ofen installierten Katalysatorretorte und dem Ofeninnenraum zu schaffen, ist diese Erhöhung der Wartungsfreundlichkeit einer Ofenanlage durch erfindungsgemäß gestaltete Katalysatorretorten ein wesentlicher Punkt im Hinblick auf die wirtschaftliche Bewertung der vorliegenden Erfindung.In addition to the main idea of the invention, namely to create an insulating layer between a catalyst retort installed in a furnace and the furnace interior, this increase in the ease of maintenance of a furnace system by catalyst retorts designed according to the invention is an essential point with regard to the economic evaluation of the present invention.

Das erfindungsgemäße Verfahren liefert also eine Erweiterung der Einsatzmöglichkeiten einer Behandlungsgaserzeugung mit Katalysatorretorten, die in einer Mehrzahl von praktischen Fällen erwünscht und vorteilhaft sein kann, wobei zusätzlich hinsichtlich der Wartungs- und Reparaturfreundlichkeit einer Wärmebehandlungsanlage wesentliche Fortschritte erzielt werden.The method according to the invention thus provides an expansion of the possible uses of treatment gas generation with catalyst retorts, which can be desired and advantageous in a number of practical cases, with additional progress being made with regard to the maintenance and repair friendliness of a heat treatment system.

Claims (4)

Verfahren zur Bereitstellung von Behandlungsgas bei Wärmebehandlungen, wobei das Behandlungsgas in einer in einem zugehörigen Ofen angeordneten, unter Ofentemperatur stehenden Katalysatorretorte erzeugt wird, dadurch gekennzeichnet, daß die Katalysatorretorte im Ofen von einer Abschirmung umgeben wird, wobei das in der Katalysatorretorte entstehende und aus dieser austretende Behandlungsgas zuerst in diese Abschirmung eingeleitet wird und erst darauf folgend aus dieser in den Ofenraum entlassen wird.Process for providing treatment gas in heat treatments, the treatment gas being generated in a catalyst retort which is arranged in an associated furnace and is at the temperature of the furnace, characterized in that the catalyst retort in the furnace is surrounded by a shield, the catalyst resultant emerging from and emerging from the catalyst retort Treatment gas is first introduced into this shield and only then is it released into the furnace chamber. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei einer im wesentlichen rohrförmigen Katalysatorretorte diese mit einer ebenfalls im wesentlichen rohrförmigen Abschirmung (11) umgeben wird, die die Katalysatorretorte mit einem Abstand umfaßt, wobei das Behandlungsgas vor seiner Einleitung in den Ofeninnenraum eine möglichst lange Strecke innerhalb der Abschirmung geführt wird.Method according to Claim 1, characterized in that in the case of a substantially tubular catalyst retort, this is surrounded by a likewise essentially tubular shield (11) which surrounds the catalyst retort at a distance, the treatment gas being as long as possible before being introduced into the interior of the furnace is routed within the shield. Vorrichtung zur Durchführung des Verfahrens nach einem oder mehreren der obigen Ansprüche mit einer im wesentlichen rohrföhrmigen Katalysatorretorte (1) mit Mantelrohr, Beheizung, Katalysatormaterial und Gaszufuhr- und -abfuhreinrichtungen sowie Gasaustrittsöffnungen für das erzeugtes Behandlungsgas dadurch gekennzeichnet,
daß mit der im wesentlichen rohrföhrmigen eigentlichen Katalysatorretorte ein im Querschnitt so gewähltes Hüllrohr (11) oder sonstiges Profil verbunden ist, daß die Katalysatorretorte in diesem Hüllrohr oder Profil etwa koaxial und zentriert angeordnet ist und sich dabei ein die Katalysatorretorte umgebender Freiraum (14) ergibt, wobei das Hüllrohr oder Profil mit Durchtrittsöffnungen (15) für das in ihr aufgefangene Behandlungsgas ausgestattet ist.Device for carrying out the method according to one or more of the above claims with an essentially tubular catalyst retort (1) with a jacket tube, heating, catalyst material and gas supply and discharge devices and gas outlet openings for the treatment gas generated, characterized in that
that with the essentially tubular actual catalyst retort, a cladding tube (11) or other profile selected in cross section is connected such that the catalyst retort is arranged approximately coaxially and centered in this cladding tube or profile and this results in a free space (14) surrounding the catalyst retort, wherein the cladding tube or profile is equipped with passage openings (15) for the treatment gas collected in it. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Durchtrittsöffnungen (15) im Hüllrohr oder Profil so angeordnet sind, daß sich ein möglichst langer Strömungsweg des Behandlungsgases im Hüllrohr oder Profil ergibt.Method according to Claim 3, characterized in that the passage openings (15) are arranged in the cladding tube or profile in such a way that the flow path of the treatment gas in the cladding tube or profile is as long as possible.
EP91107868A 1990-05-19 1991-05-15 Method for making available treatment gases for heat treatments Expired - Lifetime EP0458183B1 (en)

Applications Claiming Priority (2)

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DE4016183 1990-05-19
DE4016183A DE4016183A1 (en) 1990-05-19 1990-05-19 METHOD FOR IMPROVING THE PROVISION OF TREATMENT GAS IN HEAT TREATMENTS

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EP0458183A2 true EP0458183A2 (en) 1991-11-27
EP0458183A3 EP0458183A3 (en) 1992-04-01
EP0458183B1 EP0458183B1 (en) 1994-12-07

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EP (1) EP0458183B1 (en)
AT (1) ATE115192T1 (en)
BR (1) BR9101982A (en)
CZ (1) CZ285210B6 (en)
DE (2) DE4016183A1 (en)
ES (1) ES2067795T3 (en)
HU (1) HU209813B (en)
ZA (1) ZA913797B (en)

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EP0860512A2 (en) * 1997-02-25 1998-08-26 Linde Aktiengesellschaft Method/apparatus for making a treating gas for the thermal treatment of a metallic product

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EP0860512A3 (en) * 1997-02-25 1998-09-23 Linde Aktiengesellschaft Method/apparatus for making a treating gas for the thermal treatment of a metallic product

Also Published As

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EP0458183A3 (en) 1992-04-01
ES2067795T3 (en) 1995-04-01
DE4016183A1 (en) 1991-11-21
HU911656D0 (en) 1991-11-28
CZ285210B6 (en) 1999-06-16
EP0458183B1 (en) 1994-12-07
HUT61055A (en) 1992-11-30
US5160380A (en) 1992-11-03
HU209813B (en) 1994-11-28
BR9101982A (en) 1991-12-24
ATE115192T1 (en) 1994-12-15
ZA913797B (en) 1992-02-26
CS144991A3 (en) 1992-01-15
DE59103752D1 (en) 1995-01-19

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