EP1842930A1 - Process for heat treatment - Google Patents
Process for heat treatment Download PDFInfo
- Publication number
- EP1842930A1 EP1842930A1 EP06015702A EP06015702A EP1842930A1 EP 1842930 A1 EP1842930 A1 EP 1842930A1 EP 06015702 A EP06015702 A EP 06015702A EP 06015702 A EP06015702 A EP 06015702A EP 1842930 A1 EP1842930 A1 EP 1842930A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat treatment
- injected
- propellant gas
- furnace
- atmosphere
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
- F27B9/3011—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases arrangements for circulating gases transversally
-
- 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
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
-
- 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
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
Definitions
- the invention relates to a method for heat treating workpieces in a heat treatment furnace, wherein the treatment atmosphere is circulated in the heat treatment furnace.
- the treatment atmosphere is circulated by fans to improve the homogeneity of the atmosphere within the furnace. Furthermore, it should be achieved by a faster mass transfer between the furnace atmosphere and the heat treatment.
- a continuous furnace in which by blowing the treatment gas in the furnace interior a defined gas flow in or against the passage direction of the material to be treated, ie parallel to the longitudinal direction of the furnace is generated.
- the gas flow is preferably oriented so that the advance of false air at critical points is prevented as possible.
- Object of the present invention is therefore to provide a method for heat treatment, which avoids the problems associated with the circulation of the treatment atmosphere by fans as possible.
- This object is achieved by a method of the type mentioned above, wherein a propellant gas is injected into the heat treatment furnace, that the treatment atmosphere is circulated substantially by the injected propellant gas.
- propellant gas is injected into the heat treatment furnace.
- the Einstrahlorte and the irradiation directions of the various propellant jets are chosen so that the best possible circulation of the treatment atmosphere takes place in the heat treatment furnace.
- additional measures for circulating the treatment atmosphere can essentially be dispensed with.
- the atmosphere in the heat treatment furnace is circulated only by the injected propellant gas.
- the atmosphere in the heat treatment furnace is circulated only by the injected propellant gas.
- fans as they are previously used for this purpose, can be dispensed with.
- the invention thus represents a largely maintenance-free replacement for the previously conventional fan systems.
- the maintenance and repair costs can be significantly reduced.
- the propellant gas is injected substantially transversely to the longitudinal direction of the heat treatment furnace.
- the initially mentioned method according to the EP 0 355 520 B1 is only applicable in the cooling zone of the continuous furnace, but not in the actual furnace chamber.
- the cooling zone is relatively long, but has only a very small transverse extent, so that a longitudinal flow can be well produced.
- the furnace or treatment room in which the actual heat treatment takes place is much higher and has numerous installations.
- the atmosphere in the treatment room has a different composition, in particular a higher viscosity. Because of these factors, it would be difficult to do with the method according to the EP 0 355 520 B1 cause a defined longitudinal flow in the treatment room. A circulation of the atmosphere is not achieved anyway by the gas flow orientation proposed in this document.
- the propellant gas is injected transversely to the furnace longitudinal direction, ie in a continuous furnace transverse to the direction of passage of the workpieces to be treated.
- the angle between the Eindüsraum of the propellant gas and the Oven longitudinal direction more than 45 °, more preferably more than 60 °, most preferably more than 80 °.
- the propellant is injected at high speed, preferably at a rate of more than 50 m / s, more preferably more than the speed of sound, in the heat treatment furnace. Due to the high exit velocity of the propellant gas surrounding the propellant nozzle and the propellant gas atmosphere is entrained and achieved an increased circulation.
- the motive nozzle is designed so that the ratio of injected propellant gas quantity to entrained gas amount is as large as possible, preferably between 1 to 20 and 1 to 60.
- the propellant is injected at a pressure between 2 and 20 bar, preferably between 2 and 10 bar in the heat treatment furnace. It has been shown that the choice of high pressures also a more uniform distribution of the treatment atmosphere is achieved.
- Nitrogen has the advantage that, in most treatment atmospheres, it always occurs or has to be added as an inert constituent. In principle, it is also possible to inject air as a propellant gas. It must be ensured that the Injected amount of air in a reasonable ratio to the total amount of inert gas and the other supplied media, such as hydrocarbons, is.
- a heat treatment furnace usually has different furnace zones, for example an inlet zone, the actual treatment room in which the material to be treated is exposed under defined conditions to a defined atmosphere, and a cooling and outlet zone.
- the invention is particularly suitable for circulating the atmosphere in the treatment room of a heat treatment furnace.
- the propellant gas nozzles are arranged so that the propellant jets ejected from them influence each other so that the atmosphere is circulated as well as possible.
- hydrocarbon carrier preferably in liquid form
- the hydrocarbon carrier can be injected together with the carrier gas or fed via separate nozzles.
- the hydrocarbon carrier is injected under high pressure of more than 50 bar, preferably more than 100 bar, in the heat treatment furnace. Due to the high pressure, the hydrocarbon carrier atomizes after injection and is finely dispersed in the furnace atmosphere. The improved mixing of the hydrocarbon carrier with the atmosphere significantly reduces soot formation.
- the injection of the hydrocarbon carrier under high pressure makes it possible to use liquid-phase atmospheric-forming hydrocarbons.
- high pressures of more than 200 bar and / or pulsed introduction are advantageous. Both measures achieve an improved momentum effect on the surrounding atmosphere.
- the invention thus also allows the use of higher-value hydrocarbons.
- gaseous hydrocarbon carriers are fed to the heat treatment furnace under low pressure and distributed by means of a propellant gas in the furnace chamber.
- the hydrocarbon carrier is so in the intake fed to a propellant nozzle, that this is entrained and swirled by the injected under high pressure and at high speed propellant gas.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Wärmebehandlung von Werkstücken in einem Wärmebehandlungsofen, wobei die Behandlungsatmosphäre in dem Wärmebehandlungsofen umgewälzt wird.The invention relates to a method for heat treating workpieces in a heat treatment furnace, wherein the treatment atmosphere is circulated in the heat treatment furnace.
In vielen Wärmebehandlungsöfen wird die Behandlungsatmosphäre mit Ventilatoren umgewälzt, um die Homogenität der Atmosphäre innerhalb der Ofenanlage zu verbessern. Desweiteren soll dadurch ein rascherer Stoffaustausch zwischen der Ofenatmosphäre und dem Wärmebehandlungsgut erreicht werden.In many heat treatment furnaces, the treatment atmosphere is circulated by fans to improve the homogeneity of the atmosphere within the furnace. Furthermore, it should be achieved by a faster mass transfer between the furnace atmosphere and the heat treatment.
Betrieb, Wartung und Instandhaltung dieser Ventilatorensysteme verursachen beim Betreiber der Ofenanlage oftmals erhebliche Kosten. Auch können durch Unwuchten an den Ventilatoren in dem Wärmebehandlungsofen Vibrationen hervorgerufen werden, die die Ofenkonstruktion, beispielsweise Muffeln, Retorten, Heizelemente oder die Ausmauerung, schädigen können.Operation, maintenance and repair of these fan systems often cause considerable costs for the operator of the furnace. Also, unbalances on the fans in the heat treatment furnace can cause vibrations that can damage the furnace construction, such as muffles, retorts, heating elements or the brick lining.
Aus der
Durch diese bekannte Verfahrensweise wird zwar eine Hauptströmungsrichtung im Ofen hervorgerufen, allerdings keine Umwälzung der Atmosphäre in sich. Das heißt, die Homogenität der Atmosphäre im Ofeninneren wird nicht erhöht. Im Gegenteil, die Gasströmung erzeugt im Ofen gezielt ein Konzentrationsgefälle.Although a main flow direction in the oven is caused by this known procedure, but no circulation of the atmosphere in itself. That is, the homogeneity of the atmosphere inside the furnace is not increased. On the contrary, the gas flow generates a concentration gradient in the furnace.
Aufgabe vorliegender Erfindung ist es daher, ein Verfahren zur Wärmebehandlung aufzuzeigen, welches die mit der Umwälzung der Behandlungsatmosphäre durch Ventilatoren verbundenen Probleme möglichst vermeidet.Object of the present invention is therefore to provide a method for heat treatment, which avoids the problems associated with the circulation of the treatment atmosphere by fans as possible.
Diese Aufgabe wird durch ein Verfahren der eingangs genannten Art gelöst, wobei ein Treibgas so in den Wärmebehandlungsofen eingedüst wird, dass die Behandlungsatmosphäre im Wesentlichen durch das eingedüste Treibgas umgewälzt wird.This object is achieved by a method of the type mentioned above, wherein a propellant gas is injected into the heat treatment furnace, that the treatment atmosphere is circulated substantially by the injected propellant gas.
Erfindungsgemäß wird in den Wärmebehandlungsofen Treibgas eingestrahlt. Die Einstrahlorte und die Einstrahlrichtungen der verschiedenen Treibgasstrahlen werden so gewählt, dass eine möglichst gute Umwälzung der Behandlungsatmosphäre in dem Wärmebehandlungsofen stattfindet. Bei geeigneter Anordnung der für die Einstrahlung des Treibgases vorgesehenen Treibgasdüsen kann auf zusätzliche Maßnahmen zur Umwälzung der Behandlungsatmosphäre im Wesentlichen verzichtet werden.According to the invention, propellant gas is injected into the heat treatment furnace. The Einstrahlorte and the irradiation directions of the various propellant jets are chosen so that the best possible circulation of the treatment atmosphere takes place in the heat treatment furnace. With a suitable arrangement of the propellant gas nozzles provided for the irradiation of the propellant gas, additional measures for circulating the treatment atmosphere can essentially be dispensed with.
Vorzugsweise wird die Atmosphäre in dem Wärmebehandlungsofen nur durch das eingedüste Treibgas umgewälzt. Auf Ventilatoren, wie sie bisher zu diesem Zweck eingesetzt werden, kann verzichtet werden. Die Erfindung stellt damit einen weitgehend wartungsfreien Ersatz für die bisher üblichen Ventilatorsysteme dar. Die Wartungs- und Instandhaltungskosten können wesentlich abgesenkt werden.Preferably, the atmosphere in the heat treatment furnace is circulated only by the injected propellant gas. On fans, as they are previously used for this purpose, can be dispensed with. The invention thus represents a largely maintenance-free replacement for the previously conventional fan systems. The maintenance and repair costs can be significantly reduced.
Von Vorteil wird das Treibgas im Wesentlichen quer zur Längsrichtung des Wärmebehandlungsofens eingedüst. Das eingangs erwähnte Verfahren gemäß der
Von Vorteil wird daher das Treibgas quer zur Ofenlängsrichtung, d.h. bei einem Durchlaufofen quer zur Durchlaufrichtung der zu behandelnden Werkstücke, eingedüst. Bevorzugt beträgt der Winkel zwischen der Eindüsrichtung des Treibgases und der Ofenlängsrichtung mehr als 45°, besonders bevorzugt mehr als 60°, ganz besonders bevorzugt mehr als 80°. Auf diese Weise werden Atmosphärenumwälzungen hervorgerufen, die sich nicht über den gesamten Innenraum des Wärmebehandlungsofens erstrecken, sondern auf bestimmte Teilbereiche beschränkt sind. In diesen Teilbereichen wird eine weitgehend homogene Atmosphäre erzeugt und, aufgrund der Umwälzung, die Wechselwirkung zwischen dem Behandlungsgut und der Atmosphäre verstärkt.Advantageously, therefore, the propellant gas is injected transversely to the furnace longitudinal direction, ie in a continuous furnace transverse to the direction of passage of the workpieces to be treated. Preferably, the angle between the Eindüsrichtung of the propellant gas and the Oven longitudinal direction more than 45 °, more preferably more than 60 °, most preferably more than 80 °. In this way, atmospheric revolutions are caused that do not extend over the entire interior of the heat treatment furnace, but are limited to certain sub-areas. In these subregions, a largely homogeneous atmosphere is generated and, due to the circulation, the interaction between the material to be treated and the atmosphere intensified.
Es hat sich gezeigt, dass auch bei Winkeln zwischen 15 und 40°, bevorzugt zwischen 20 und 35°, besonders bevorzugt zwischen 25 und 30°, bei geeigneter Anordnung der Treibdüsen eine gute Umwälzung der Ofenatmosphäre erzielt werden kann.It has been shown that even with angles between 15 and 40 °, preferably between 20 and 35 °, particularly preferably between 25 and 30 °, with a suitable arrangement of the motive nozzles, a good circulation of the furnace atmosphere can be achieved.
Von Vorteil wird das Treibgas mit hoher Geschwindigkeit, bevorzugt mit einer Geschwindigkeit von mehr als 50 m/s, besonders bevorzugt mehr als Schallgeschwindigkeit, in den Wärmebehandlungsofen eingedüst. Durch die hohe Austrittsgeschwindigkeit des Treibgases wird die die Treibgasdüse und den Treibgasstrahl umgebende Atmosphäre mitgerissen und eine verstärkte Umwälzung erzielt.Advantageously, the propellant is injected at high speed, preferably at a rate of more than 50 m / s, more preferably more than the speed of sound, in the heat treatment furnace. Due to the high exit velocity of the propellant gas surrounding the propellant nozzle and the propellant gas atmosphere is entrained and achieved an increased circulation.
Vorzugsweise wird die Treibdüse so ausgelegt, dass das Verhältnis von eingedüster Treibgasmenge zu mitgerissener Gasmenge möglichst groß wird, vorzugsweise zwischen 1 zu 20 und 1 zu 60 liegt.Preferably, the motive nozzle is designed so that the ratio of injected propellant gas quantity to entrained gas amount is as large as possible, preferably between 1 to 20 and 1 to 60.
In einer bevorzugten Ausführungsform wird das Treibgas mit einem Druck zwischen 2 und 20 bar, bevorzugt zwischen 2 und 10 bar in den Wärmebehandlungsofen eingedüst. Es hat sich gezeigt, dass durch die Wahl hoher Drücke ebenfalls eine gleichmäßigere Verteilung der Behandlungsatmosphäre erreicht wird.In a preferred embodiment, the propellant is injected at a pressure between 2 and 20 bar, preferably between 2 and 10 bar in the heat treatment furnace. It has been shown that the choice of high pressures also a more uniform distribution of the treatment atmosphere is achieved.
Ebenso hat sich eine gepulste Einbringung des Treibgases bewährt.Likewise, a pulsed introduction of the propellant gas has proven itself.
Als Treibgas wird von Vorteil gasförmiger Stickstoff verwendet. Stickstoff hat den Vorteil, dass dieser in den meisten Behandlungsatmosphären ohnehin als inerter Bestandteil vorkommt oder zugeführt werden muss. Grundsätzlich ist es aber auch möglich, Luft als Treibgas einzudüsen. Hierbei ist darauf zu achten, dass die eingedüste Luftmenge in einem sinnvollen Verhältnis zur Gesamtmenge an Schutzgas sowie den anderen zugeführten Medien, beispielsweise Kohlenwasserstoffen, steht.As a propellant gas is advantageously used nitrogen. Nitrogen has the advantage that, in most treatment atmospheres, it always occurs or has to be added as an inert constituent. In principle, it is also possible to inject air as a propellant gas. It must be ensured that the Injected amount of air in a reasonable ratio to the total amount of inert gas and the other supplied media, such as hydrocarbons, is.
Ein Wärmebehandlungsofen weist in der Regel verschiedene Ofenzonen auf, beispielsweise eine Einlaufzone, den eigentlichen Behandlungsraum, in dem das Behandlungsgut unter definierten Bedingungen einer definierten Atmosphäre ausgesetzt wird, und eine Kühl- und Auslaufzone. Die Erfindung eignet sich insbesondere, um die Atmosphäre im Behandlungsraum eines Wärmebehandlungsofens umzuwälzen.A heat treatment furnace usually has different furnace zones, for example an inlet zone, the actual treatment room in which the material to be treated is exposed under defined conditions to a defined atmosphere, and a cooling and outlet zone. The invention is particularly suitable for circulating the atmosphere in the treatment room of a heat treatment furnace.
Vorzugsweise werden die Treibgasdüsen so angeordnet, dass sich die von diesen ausgestoßenen Treibgasstrahlen gegenseitig so beeinflussen, dass die Atmosphäre möglichst gut umgewälzt wird.Preferably, the propellant gas nozzles are arranged so that the propellant jets ejected from them influence each other so that the atmosphere is circulated as well as possible.
Es hat sich weiter als günstig erwiesen, zusätzlich einen Kohlenwasserstoffträger, bevorzugt in flüssiger Form, in den Wärmebehandlungsofen einzudüsen. Der Kohlenwasserstoffträger kann gemeinsam mit dem Trägergas eingedüst oder über separate Düsen zugeführt werden.It has also proved to be beneficial to additionally inject a hydrocarbon carrier, preferably in liquid form, in the heat treatment furnace. The hydrocarbon carrier can be injected together with the carrier gas or fed via separate nozzles.
Vorzugsweise wird der Kohlenwasserstoffträger unter hohem Druck von mehr als 50 bar, bevorzugt mehr als 100 bar, in den Wärmebehandlungsofen eingedüst. Aufgrund des hohen Drucks zerstäubt der Kohlenwasserstoffträger nach dem Eindüsen und wird in der Ofenatmosphäre fein verteilt. Durch die verbesserte Vermischung des Kohlenwasserstoffträgers mit der Atmosphäre wird die Russbildung deutlich verringert.Preferably, the hydrocarbon carrier is injected under high pressure of more than 50 bar, preferably more than 100 bar, in the heat treatment furnace. Due to the high pressure, the hydrocarbon carrier atomizes after injection and is finely dispersed in the furnace atmosphere. The improved mixing of the hydrocarbon carrier with the atmosphere significantly reduces soot formation.
Das Eindüsen des Kohlenwasserstoffträgers unter hohem Druck erlaubt es, flüssigphasige atmosphärenbildende Kohlenwasserstoffe einzusetzen. Hierbei sind insbesondere hohe Drücke von mehr als 200 bar und/oder ein gepulstes Einbringen von Vorteil. Durch beide Maßnahmen wird eine verbesserte Impulswirkung auf die umgebende Atmosphäre erreicht. Die Erfindung ermöglicht damit auch den Einsatz von höherwertigen Kohlenwasserstoffen.The injection of the hydrocarbon carrier under high pressure makes it possible to use liquid-phase atmospheric-forming hydrocarbons. In particular, high pressures of more than 200 bar and / or pulsed introduction are advantageous. Both measures achieve an improved momentum effect on the surrounding atmosphere. The invention thus also allows the use of higher-value hydrocarbons.
Insbesondere gasförmige Kohlenwasserstoffträger werden dem Wärmebehandlungsofen unter niedrigem Druck zugeführt und mittels eines Treibgases im Ofenraum verteilt. Hierzu wird der Kohlenwasserstoffträger so im Einsaugbereich einer Treibgasdüse zugeführt, dass dieser von dem unter hohem Druck und mit hoher Geschwindigkeit eingedüsten Treibgas mitgerissen und verwirbelt wird.In particular gaseous hydrocarbon carriers are fed to the heat treatment furnace under low pressure and distributed by means of a propellant gas in the furnace chamber. For this purpose, the hydrocarbon carrier is so in the intake fed to a propellant nozzle, that this is entrained and swirled by the injected under high pressure and at high speed propellant gas.
Claims (8)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07006603.0A EP1842931B1 (en) | 2006-04-04 | 2007-03-29 | Method for heat treatment |
ES07006603T ES2462543T3 (en) | 2006-04-04 | 2007-03-29 | Heat treatment method |
PL07006603T PL1842931T3 (en) | 2006-04-04 | 2007-03-29 | Method for heat treatment |
BRPI0702253A BRPI0702253B1 (en) | 2006-04-04 | 2007-04-03 | heat treatment process of parts in a heat treatment oven |
US11/732,317 US7955450B2 (en) | 2006-04-04 | 2007-04-03 | Method for heat treatment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610015739 DE102006015739A1 (en) | 2006-04-04 | 2006-04-04 | Process for heat treatment |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1842930A1 true EP1842930A1 (en) | 2007-10-10 |
Family
ID=36968695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06015702A Withdrawn EP1842930A1 (en) | 2006-04-04 | 2006-07-27 | Process for heat treatment |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1842930A1 (en) |
DE (1) | DE102006015739A1 (en) |
ES (1) | ES2462543T3 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4191525A (en) * | 1978-03-30 | 1980-03-04 | N L Industries, Inc. | Aspiration circulation system and method |
EP0075438A1 (en) * | 1981-09-19 | 1983-03-30 | BOC Limited | Heat treatment of metals |
EP0355520A2 (en) * | 1988-08-18 | 1990-02-28 | Linde Aktiengesellschaft | Method of heat treating workpieces |
US5795146A (en) * | 1996-05-23 | 1998-08-18 | Btu International, Inc. | Furnace chamber having eductor to enhance thermal processing |
EP1004837A1 (en) * | 1998-05-12 | 2000-05-31 | Joaquin Plana Querol | Longitudinal continuous furnace applicable to construction ceramic material |
-
2006
- 2006-04-04 DE DE200610015739 patent/DE102006015739A1/en not_active Withdrawn
- 2006-07-27 EP EP06015702A patent/EP1842930A1/en not_active Withdrawn
-
2007
- 2007-03-29 ES ES07006603T patent/ES2462543T3/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4191525A (en) * | 1978-03-30 | 1980-03-04 | N L Industries, Inc. | Aspiration circulation system and method |
EP0075438A1 (en) * | 1981-09-19 | 1983-03-30 | BOC Limited | Heat treatment of metals |
EP0355520A2 (en) * | 1988-08-18 | 1990-02-28 | Linde Aktiengesellschaft | Method of heat treating workpieces |
US5795146A (en) * | 1996-05-23 | 1998-08-18 | Btu International, Inc. | Furnace chamber having eductor to enhance thermal processing |
EP1004837A1 (en) * | 1998-05-12 | 2000-05-31 | Joaquin Plana Querol | Longitudinal continuous furnace applicable to construction ceramic material |
Also Published As
Publication number | Publication date |
---|---|
DE102006015739A1 (en) | 2007-10-11 |
ES2462543T3 (en) | 2014-05-23 |
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