EP0320763A1 - Method for the heat treatment of metals - Google Patents
Method for the heat treatment of metals Download PDFInfo
- Publication number
- EP0320763A1 EP0320763A1 EP88120403A EP88120403A EP0320763A1 EP 0320763 A1 EP0320763 A1 EP 0320763A1 EP 88120403 A EP88120403 A EP 88120403A EP 88120403 A EP88120403 A EP 88120403A EP 0320763 A1 EP0320763 A1 EP 0320763A1
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- Prior art keywords
- gas
- gases
- heat treatment
- oxygen
- protective gas
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 title claims abstract description 23
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 6
- 239000002184 metal Substances 0.000 title claims abstract description 6
- 150000002739 metals Chemical class 0.000 title claims abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 96
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims description 20
- 238000004140 cleaning Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000007710 freezing Methods 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 5
- 239000001301 oxygen Substances 0.000 claims 5
- 229910052760 oxygen Inorganic materials 0.000 claims 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims 1
- 229910002091 carbon monoxide Inorganic materials 0.000 claims 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 239000002912 waste gas Substances 0.000 abstract 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229940090046 jet injector Drugs 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- 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
Definitions
- Heat treatments of metals in furnaces are usually carried out under a protective gas atmosphere at temperatures of around 500 to 1200 ° C, with the high temperatures often being generated with gas burners. Both the used shielding gas and the exhaust gases from the heating burner are usually discharged unused today. From an economic point of view, this is not necessarily sensible and, above all, not environmentally friendly.
- a further problem in the heat treatment of metals is that special high-quality protective gases, e.g. with very low CO2 and H2O proportions are necessary, e.g. with carbon neutral annealing.
- This requirement can be met with a gas generator or a retort in the furnace that generates protective gas, e.g. a catalyst insert, possibly not accessible, so that the protective gas generated must be subjected to a preliminary cleaning before being introduced into the furnace. So far, this has only been possible with very expensive MEA washing systems or molecular sieve devices.
- the object of the present invention is therefore to provide an economical and effective method for cleaning exhaust gases and other contaminated process gases.
- This object is achieved in that at least some of the exhaust gases and / or the contaminated process gases are cooled by direct and / or indirect heat exchange with at least one of the starting gases present in liquefied form in such a way that the contaminants contained therein condense or freeze out and the condensed or frozen impurities are separated from the product gas thus generated.
- the method described is particularly advantageous since a process gas which is kept in liquefied form, as is the case with many heat treatment methods, serves to solve an additional task.
- the latent heat or cold necessary for gasification of the liquid gas is used, which is simple in known methods is removed from the environment, ie remains unused, in order to achieve the cleaning of a gas which also occurs in the process, for example heating burner exhaust gases or used protective gas, via condensation and freezing out of undesired substances.
- carbon dioxide, water vapor and hydrocarbons are "filtered out".
- the process thus delivers an exhaust gas that meets today's environmental protection requirements or, if applicable, a reusable product gas.
- At least part of the cleaned gas is used for the ongoing heat treatment.
- the gases to be cleaned are sucked in with the aid of at least one injector, in which the liquid gas is injected to produce the water jet pump effect, and brought into direct contact with the liquid gas.
- an independent pump unit can be dispensed with and rapid cooling, condensation and freezing are achieved through direct contact between the liquid gas and the gas to be cleaned.
- This procedure enables continuous process control with simple removal of the accumulated impurities during the regeneration time of a separator.
- Claims 5 to 8 contain process variants in which the method according to the invention is used particularly advantageously or particularly advantageous refinements in special applications.
- FIG. 1 shows the use of the method according to the invention for cleaning and treating the exhaust gas from the heating burner in a heat treatment device.
- the exhaust gas coming from a heating burner 1 from a heat treatment furnace 2 is passed through a precooler 3 by the effect of a Liquid jet injector 4 having a water jet pump is sucked in and transported further into one of two separators 5, 6 arranged in parallel.
- separator 5 is connected as a separator, whereas separator 6 is in the regeneration state.
- the separator 5 connected as a filter is cooled with liquid nitrogen, so that pollutants condense and freeze therein or remain condensed and frozen out.
- a largely impurity-free product gas leaves it, which can be released into the atmosphere without any problems, or at least partially can be used in a mixing unit 7 to form protective gas with suitable admixture of further starting gases or alcohols, for example nitrogen or hydrogen or methanol or ethanol.
- the liquid nitrogen used for cooling which is then in the gaseous state, is fed into the supply of gaseous nitrogen and is thus actually used.
- the separator 6 switched for regeneration is meanwhile "thawed" and the accumulated pollutants are discharged in liquid form or driven out in gaseous form with a low gas flow and appropriately disposed of.
- FIG. 2 shows a diagram for the production of high-purity protective gas which is generated with a retort 9 lying in the heat treatment furnace 2 and which is pre-cleaned before it is actually fed into the furnace 2.
- the protective gas containing slightly impurities is suctioned off after its synthesis in the retort 2 and then, as described in the previous exemplary embodiment, cleaned, any dilution with nitrogen being possible on the one hand by the injector and on the other hand by adding gaseous nitrogen in another way.
- This product gas is then fed to the furnace 2 as a high-purity protective gas.
- the protective gas can be subjected to such cleaning immediately after generation in the generator.
- exhaust gas cleaning and reuse can of course also be carried out.
- the method according to the invention e.g. the exploitation of the latent heat of the liquefied gas on the one hand and on the other hand the production of gaseous gas from liquefied gas as well as the provision of reusable gas from exhaust gas or spent shielding gas, a process that is both economical because of the economical use of starting gases and environmentally friendly because of the low level of pollution represents.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
Es handelt sich um ein Verfahren zur Wärmebehandlung von Metallen mit zunächst in verflüssigter Form vorliegenden, kalten Ausgangsgasen und Abgasen und/oder anderen verunreinigten Prozeßgasen.It is a process for the heat treatment of metals with cold starting gases and exhaust gases and / or other contaminated process gases which are initially present in liquefied form.
Wärmebehandlungen von Metallen in Öfen werden in aller Regel unter Schutzgasatmosphären bei Temperaturen von etwa 500 bis 1200 °C durchgeführt, wobei die hohen Temperaturen häufig mit Gasbrennern erzeugt werden. Sowohl verbrauchtes Schutzgas als auch die Abgase der Heizbrenner werden heute in der Regel ungenutzt abgeleitet. Dies ist aus ökonomischer Sicht nicht unbedingt sinnvoll und vor allem nicht umweltfreundlich.Heat treatments of metals in furnaces are usually carried out under a protective gas atmosphere at temperatures of around 500 to 1200 ° C, with the high temperatures often being generated with gas burners. Both the used shielding gas and the exhaust gases from the heating burner are usually discharged unused today. From an economic point of view, this is not necessarily sensible and, above all, not environmentally friendly.
Aus der DE-PS 31 04 280 sind Verfahren bekannt, die durch geeignete Verbrennung der Brennerheizgase ein aufbereitbares Abgasgemisch erzeugen, das dann mit einer üblichen Gasaufbereitungsanlage zu Schutzgas aufbereitet wird. Diese Verfahren setzen aber einen nicht unbeträchtlichen Aufwand voraus.From DE-PS 31 04 280, methods are known which generate a treatable exhaust gas mixture by suitable combustion of the burner heating gases, which mixture is then processed to protective gas with a conventional gas processing system. However, these methods require considerable effort.
Ein weiteres Problem in der Wärmebehandlung von Metallen besteht darin, daß bei speziellen Wärmebehandlungen besonders hochwertige Schutzgase, z.B. mit sehr niedrigen CO₂- und H₂O-Anteilen notwendig sind, z.B. beim Kohlungsneutralglühen. Diese Forderung ist mit einem Gasgenerator oder einer im Ofen liegenden, Schutzgas erzeugenden Retorte, z.B. einem Katalysatoreinsatz, unter Umständen nicht erreichbar, so daß das erzeugte Schutzgas vor Einführung in den Ofen einer Vorreinigung unterzogen werden muß. Diese ist bisher nur mit sehr teuren MEA-Waschanlagen oder Molekularsiebeinrichtungen möglich.A further problem in the heat treatment of metals is that special high-quality protective gases, e.g. with very low CO₂ and H₂O proportions are necessary, e.g. with carbon neutral annealing. This requirement can be met with a gas generator or a retort in the furnace that generates protective gas, e.g. a catalyst insert, possibly not accessible, so that the protective gas generated must be subjected to a preliminary cleaning before being introduced into the furnace. So far, this has only been possible with very expensive MEA washing systems or molecular sieve devices.
Die Aufgabenstellung der vorliegenden Erfindung besteht deshalb darin, ein wirtschaftliches und effektives Verfahren zur Reinigung von Abgasen und und anderen verunreinigten Prozeßgasen bereitzustellen.The object of the present invention is therefore to provide an economical and effective method for cleaning exhaust gases and other contaminated process gases.
Diese Aufgabe wird dadurch gelöst, daß zumindest ein Teil der Abgase und/oder der verunreinigten Prozeßgase durch direkten und/oder indirekten Wärmetausch mit mindestens einem der in verflüssigter Form vorliegenden Ausgangsgase so gekühlt wird, daß die darin enthaltenen Verunreinigungen kondensieren oder ausfrieren und die kondensierten oder ausgefrorenen Verunreinigungen vom so entstehenden Produktgas abgetrennt werden.This object is achieved in that at least some of the exhaust gases and / or the contaminated process gases are cooled by direct and / or indirect heat exchange with at least one of the starting gases present in liquefied form in such a way that the contaminants contained therein condense or freeze out and the condensed or frozen impurities are separated from the product gas thus generated.
Das beschriebene Verfahren ist besonders vorteilhaft, da ein in verflüssigter Form vorrätig gehaltenes Prozeßgas, wie es bei vielen Wärmebehandlungsverfahren der Fall ist, zur Lösung einer zusätzlichen Aufgabe dient. Es wird die zur Vergasung des Flüssiggases notwendige latente Wärme bzw. Kälte genutzt, die bei bekannten Verfahren einfach der Umgebung entnommen wird, also ungenutzt bleibt, um die Reinigung eines ebenfalls im Prozeßablauf auftretenden Gases, z.B. Heizbrennerabgase oder verbrauchtes Schutzgas, über Kondensation und Ausfrieren von unerwünschten Stoffen zu erreichen. Dabei werden insbesondere Kohlendioxid, Wasserdampf und Kohlenwasserstoffe "herausgefiltert". Das Verfahren liefert so ein, den heutigen Umweltschutz-anforderungen gerecht werdendes Abgas oder gegebenenfalls ein weiter verwendbares Produktgas.The method described is particularly advantageous since a process gas which is kept in liquefied form, as is the case with many heat treatment methods, serves to solve an additional task. The latent heat or cold necessary for gasification of the liquid gas is used, which is simple in known methods is removed from the environment, ie remains unused, in order to achieve the cleaning of a gas which also occurs in the process, for example heating burner exhaust gases or used protective gas, via condensation and freezing out of undesired substances. In particular, carbon dioxide, water vapor and hydrocarbons are "filtered out". The process thus delivers an exhaust gas that meets today's environmental protection requirements or, if applicable, a reusable product gas.
In einer besonders vorteilhaften Ausgestaltung der Erfindung wird zumindest ein Teil des gereinigten Gases für die laufende Wärmebehandlung verwendet.In a particularly advantageous embodiment of the invention, at least part of the cleaned gas is used for the ongoing heat treatment.
Aufgrund der Reinigung bestimmter Prozeßgase ist zumindest eine teilweise Verwendung des daraus entstehenden Produktgases, z.B. zur Schutzgasbildung oder als Fluidisierungsgas für den Betrieb von Wirbelschichtöfen, möglich. Dies führt zum Teil zu erheblichen Einsparungen, z.B. bei der Verwendung zur Schutzgasbildung zu Einsparungen bis zu 50 % bei den ansonsten noch zur Schutzgaserzeugung notwendigen Ausgangsmedien.Due to the cleaning of certain process gases, at least a partial use of the resulting product gas, e.g. for the formation of protective gas or as a fluidizing gas for the operation of fluidized bed furnaces. This sometimes leads to considerable savings, e.g. savings of up to 50% when using shielding gas formation for the source media that are otherwise required for shielding gas generation.
In einer günstigen Ausgestaltung des Verfahrens werden die zu reinigenden Gase mit Hilfe mindestens eines Injektors, in dem das Flüssiggas unter Erzeugung des Wasserstrahlpumpeneffekts eingedüst wird, angesaugt und direkt mit dem Flüssiggas in Berührung gebracht.In a favorable embodiment of the method, the gases to be cleaned are sucked in with the aid of at least one injector, in which the liquid gas is injected to produce the water jet pump effect, and brought into direct contact with the liquid gas.
Durch den Einsatz eines Injektors kann auf ein eigenständiges Pumpaggregat verzichtet werden und es wird durch die direkte Berührung zwischen Flüssiggas und zu reinigendem Gas ein schnelles Abkühlen, Kondensieren und Ausfrieren erreicht.By using an injector, an independent pump unit can be dispensed with and rapid cooling, condensation and freezing are achieved through direct contact between the liquid gas and the gas to be cleaned.
Besonders vorteilhaft ist es, wenn zur Abscheidung der Kondensate und Ausfrierprodukte zwei vertauschbar geschaltete Abscheider verwendet werden, von denen jeweils einer abscheidet, während der andere regeneriert wird.It is particularly advantageous if two interchangeable separators are used to separate the condensates and freeze-out products, one separating each while the other is being regenerated.
Dieses Vorgehen ermöglicht eine kontinuierliche Verfahrensführung mit einfacher Entnahme der angefallenen Verunreinigungen während der Regenerationszeit eines Abscheiders.This procedure enables continuous process control with simple removal of the accumulated impurities during the regeneration time of a separator.
Die Ansprüche 5 bis 8 enthalten Verfahrensvarianten, in denen das erfindungsgemäße Verfahren besonders vorteilhaft Anwendung findet oder besonders vorteilhafte Ausgestaltungen in speziellen Anwendungsfällen.
Im folgenden sollen Ausführungsbeispiele des erfindungsgemäßen Verfahrens anhand der Figuren näher erläutert werden.Exemplary embodiments of the method according to the invention are to be explained in more detail below with reference to the figures.
Es zeigen:
Figur 1 Schema zur Brennerabgasreinigung mit Weiterverwendung des gereinigten Abgases als SchutzgasFigur 2 Schema zur Herstellung hochreinen Schutzgases bei Schutzgaserzeugung mit Erzeugungsretorte.
- Figure 1 scheme for burner exhaust gas cleaning with further use of the cleaned exhaust gas as a protective gas
- Figure 2 Scheme for the production of high-purity shielding gas with protective gas generation with generation retort.
In Figur 1 ist der Einsatz des erfindungsgemäßen Verfahrens zur Reinigung und Aufbereitung des Abgases der Heizbrenner bei einer Wärmebehandlungseinrichtung dargestellt. Das von einem Heizbrenner 1 aus einem Wärmebehandlungsofen 2 kommende Abgas wird über einen Vorkühler 3 durch einen, die Wirkung einer Wasserstrahlpumpe besitzenden Flüssiggasinjektor 4 angesaugt und in einen von zwei parallel angeordneten Abscheidern 5, 6 weitertransportiert. In der in der Zeichung dargestellten Einstellung ist Abscheider 5 als Abscheider geschaltet, wogegen sich Abscheider 6 im Regenerationszustand befindet. Der als Filter geschaltete Abscheider 5 wird mit flüssigem Stickstoff gekühlt, so daß darin Schadstoffe kondensieren und ausfrieren bzw. kondensiert und ausgefroren bleiben. Ihn verläßt ein weitgehend verunreinigungsfreies Produktgas, das problemlos in die Atmospäre entlassen werden kann, oder zumindest teilweise zur Bildung von Schutzgas unter geeigneter Beimischung weiterer Ausgangsgase oder Alkohole, z.B. Stickstoff oder Wasserstoff bzw. Methanol oder Äthanol, in einer Mischeinheit 7 einsetzbar ist. Der zur Kühlung verwendete Flüssigstickstoff, der sich danach in gasförmigen Zustand befindet, wird in die Versorgung mit gasförmigem Stickstoff eingespeist und gelangt so zu seiner eigentlichen Anwendung. Der zur Regeneration geschaltete Abscheider 6 wird währenddessen "aufgetaut" und die angesammelten Schadstoffe werden in flüssiger Form abgeführt oder in gasförmiger Form mit einem geringen Gasstrom ausgetrieben und geeignet entsorgt.FIG. 1 shows the use of the method according to the invention for cleaning and treating the exhaust gas from the heating burner in a heat treatment device. The exhaust gas coming from a
Das gesamte, eben beschriebene Verfahren ist so abzustimmen¸ daß möglichst die gesamte Abgasmenge einer Reinigung unterzogen wird. Entsprechende Kriterien sind auch bei den anderen Verfahrensvarianten anzulegen.The entire process just described is to be coordinated so that the entire amount of exhaust gas is subjected to cleaning if possible. Corresponding criteria must also be applied to the other process variants.
Figur 2 zeigt ein Schema zur Herstellung von hochreinem Schutzgas, das mit einer im Wärmebehandlungsofen 2 liegenden Retorte 9 erzeugt wird und das vor seiner eigentlichen Einspeisung in den Ofen 2 vorgereinigt wird. Das geringfügig Verunreinigungen enthaltende Schutzgas wird nach seiner Synthese in der Retorte 2 abgesaugt und dann, wie im vorhergehenden Ausführungsbeispiel beschrieben, gereinigt, wobei eine beliebige Verdünnung mit Stickstoff einerseits durch den Injektor und andererseits durch anderweitige Zugabe von gasförmigem Stickstoff erfolgen kann. Dieses Produktgas wird dann als hochreines Schutzgas dem Ofen 2 zugeführt. Auch bei Schutzgaserzeugung mit einem Gasgenerator kann das Schutzgas einer solchen Reinigung direkt nach der Erzeugung im Generator unterzogen werden. Parallel zur jetzt beschriebenen Vorreinigung von Schutzgas kann natürlich auch eine Abgasreinigung und Wiederverwendung durchgeführt werden.FIG. 2 shows a diagram for the production of high-purity protective gas which is generated with a retort 9 lying in the
Das erfindungsgemäße Verfahren stellt durch seine geschickte, vernetzte Ausnutzung vorhandener Eigenschaften und Möglichkeiten, wie z.B. die Ausnutzung der latenten Wärme des Flüssiggases einerseits und andererseits gleichzeitig die Herstellung von gasförmigem Gas aus flüssigem Gas sowie die Bereitstellung von weiter verwendbarem Gas aus Abgas oder verbrauchtem Schutzgas, ein sowohl wirtschaftliches, weil sparsam im Verbrauch von Ausgangsgasen sowie umweltfreundliches, weil verunreinigungsarmes Abgas, Verfahren dar.Due to its clever, networked use of existing properties and possibilities, the method according to the invention, e.g. the exploitation of the latent heat of the liquefied gas on the one hand and on the other hand the production of gaseous gas from liquefied gas as well as the provision of reusable gas from exhaust gas or spent shielding gas, a process that is both economical because of the economical use of starting gases and environmentally friendly because of the low level of pollution represents.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3742685 | 1987-12-16 | ||
| DE19873742685 DE3742685A1 (en) | 1987-12-16 | 1987-12-16 | METHOD FOR HEAT TREATING METALS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0320763A1 true EP0320763A1 (en) | 1989-06-21 |
Family
ID=6342771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88120403A Ceased EP0320763A1 (en) | 1987-12-16 | 1988-12-07 | Method for the heat treatment of metals |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0320763A1 (en) |
| DE (1) | DE3742685A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995011999A1 (en) * | 1993-10-28 | 1995-05-04 | Loi Thermoprocess Gmbh | Process for annealing items and suitable annealing furnace |
| EP1338658A3 (en) * | 2002-02-26 | 2005-01-12 | Westfalen Ag | Method and device for heat treating workpieces |
| EP2218803A1 (en) * | 2009-02-12 | 2010-08-18 | Linde AG | Method and device for carbonisation of steel |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4125216A1 (en) * | 1991-07-30 | 1993-02-04 | Linde Ag | DEVICE FOR PURIFYING OR PREPARING GASES |
| DE4125215A1 (en) * | 1991-07-30 | 1993-02-04 | Linde Ag | METHOD FOR PURIFYING OR PREPARING GASES |
| DE4318400C1 (en) * | 1993-06-03 | 1994-06-23 | Loi Ind Ofenanlagen | Method and device for heat treating workpieces |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2082634A (en) * | 1980-08-13 | 1982-03-10 | Boc Ltd | Heat treatment method |
| DE3104280A1 (en) * | 1981-02-07 | 1982-08-12 | Daimler-Benz Ag, 7000 Stuttgart | Process for generating protective gas from the off-gas of furnaces heated by radiant tubes |
-
1987
- 1987-12-16 DE DE19873742685 patent/DE3742685A1/en not_active Withdrawn
-
1988
- 1988-12-07 EP EP88120403A patent/EP0320763A1/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2082634A (en) * | 1980-08-13 | 1982-03-10 | Boc Ltd | Heat treatment method |
| DE3104280A1 (en) * | 1981-02-07 | 1982-08-12 | Daimler-Benz Ag, 7000 Stuttgart | Process for generating protective gas from the off-gas of furnaces heated by radiant tubes |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 138 (C-231)[1575], 27. Juni 1984; & JP-A-59 047 321 (MARUZEN ENGINEERING K.K.) 17-03-1984 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995011999A1 (en) * | 1993-10-28 | 1995-05-04 | Loi Thermoprocess Gmbh | Process for annealing items and suitable annealing furnace |
| EP1338658A3 (en) * | 2002-02-26 | 2005-01-12 | Westfalen Ag | Method and device for heat treating workpieces |
| EP2218803A1 (en) * | 2009-02-12 | 2010-08-18 | Linde AG | Method and device for carbonisation of steel |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3742685A1 (en) | 1989-07-13 |
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