EP2508829A1 - Procédé et four industriel pour l'exploitation d'un gaz protecteur utilisé comme gaz de chauffage - Google Patents

Procédé et four industriel pour l'exploitation d'un gaz protecteur utilisé comme gaz de chauffage Download PDF

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Publication number
EP2508829A1
EP2508829A1 EP12002334A EP12002334A EP2508829A1 EP 2508829 A1 EP2508829 A1 EP 2508829A1 EP 12002334 A EP12002334 A EP 12002334A EP 12002334 A EP12002334 A EP 12002334A EP 2508829 A1 EP2508829 A1 EP 2508829A1
Authority
EP
European Patent Office
Prior art keywords
burner
furnace
gas
pressure
combustible
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12002334A
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German (de)
English (en)
Inventor
Rolf Sarres
Wilhelm van de Kamp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ipsen International GmbH
Original Assignee
Ipsen International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ipsen International GmbH filed Critical Ipsen International GmbH
Publication of EP2508829A1 publication Critical patent/EP2508829A1/fr
Withdrawn legal-status Critical Current

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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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • 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
    • 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

Definitions

  • the invention relates to a method and an industrial furnace for the use of a protective gas arising as a heating gas, primarily for use in an industrial furnace as well as multi-chamber furnace or pusher furnace comprising a high-temperature furnace and an upstream preheating furnace.
  • the inventive method is applicable to any processes and industrial furnaces, where a heat treatment of materials using heating gas and inert gas takes place.
  • the priority is to improve the process of using gas as well as protective gases from the outset.
  • the so-called endogas accumulating in industrial furnaces is technically and functionally defined as a gas mixture generated in the generator, which can be used as protective gas against oxidation.
  • the protective gas used in industrial furnaces is any gas mixture which protects against unwanted chemical reactions on the component to be heat-treated.
  • Nitrogen used as a protective gas against oxidation and carburization and decarburization.
  • endogas can only protect against oxidation as a protective gas, as carbon is released. Endogas is thus a carbon carrier gas, which serves for the carburization of components.
  • the resulting protective gas includes the standard but limited functional designation Endogas in professional circles, but the invention is not limited solely to accumulating endogas.
  • the heat veils can be formed completely independent of Petroendn.
  • a further improved and known method for utilizing the energy content of the kiln exhaust gases flowing out of industrial furnaces is provided according to DE 197 20 620 A1 to collect at least part of it and to reuse it for heating, possibly also with the addition of another heating medium.
  • An advantageous variant of the method thus consists in that the furnace exhaust gas is tapped out of the furnace at least at a significant Ausflußstelle and with a fan - optionally with the addition of further fuel - one or more, to supply conventional heating radiant tubes of the furnace.
  • the furnace exhaust gases can be supplied under additional pressure or by suction combustion.
  • the automatic start routine also runs from here in the control device.
  • the industrial furnace must first be brought into a safe ground state.
  • the furnace doors are first closed, and the industrial furnace is purged via air lines of the participating burner with a 5 times oven volume in air.
  • a tightness control is performed by means of a tightness control unit on the Schugaswie natural gas line.
  • the oven doors are opened again.
  • this burner and a so-called pilot burner are started. For example, if burner ionization monitoring signals a stable flame, the oven doors are closed again and the preheat oven is brought to operating temperature by the burner (as a heating burner). wherein the pilot burns until the preheat furnace is switched off again.
  • the pusher furnace can be gassed with inert gas.
  • inert gas either so-called endogas or nitrogen / methanol as carrier gas is introduced into the system.
  • endogas or nitrogen / methanol as carrier gas is introduced into the system.
  • the proper fumigation of the pusher is completed when a set via a pressure relief flap of the overpressure is reached and at the same time has set a target C-level in the oven.
  • the invention is based on the object to increase the efficiency of inert gas as Endogasverbrennung in industrial furnaces in general and especially in multi-chamber ovens as well as pusher ovens and use the resulting, but so far without further energetic use effluent protective gas as heating gas more efficient, such. also in a high-temperature furnace and preheating furnace comprising the pusher furnace systems.
  • This general procedure according to the invention is intensified under the conditions of the above process conditions a) to c) and after the above step d), namely the setting of the first burner as protective gas burner, by the following steps according to the invention:
  • a tightness control by means of a leak control unit.
  • a main valve such as gas solenoid valve in the line for the inert gas a form.
  • the above-mentioned fan is turned on, which promotes the inert gas against the closed main valve.
  • a burning point on, for example, an inlet lock of the furnace is opened during the tightness control, since in the meantime no gas is removed from the furnace via the first burner.
  • the first burner is started and the burning point is closed.
  • the first burner After the first burner has been started as a shielding gas burner, it receives priority in operation before the second burner.
  • the second as actual heating or natural gas burner is always switched on only when the power of the first burner to reach the temperature setpoint in the furnace system such as the preheating oven is not sufficient.
  • this also means that only the second burner is always switched off as inert gas burner when the setpoint of the furnace is reached. Only when the temperature then rises even further, the power of the first burner such as inert gas burner, e.g. be steadily reduced via an air control flap as a throttle for the air.
  • the first burner is switched off as a shielding gas burner at a defined maximum value of the furnace pressure, and the Abbrandstelle on the entrance lock is opened. This reduces the furnace pressure quickly again. If the preheating furnace needs energy for preheating, the first burner is switched on as a protective gas burner.
  • the industrial furnace such as pusher furnace is in operating states in which no safe protective gas supply to the first burner is guaranteed, this is switched off and the heating of the example preheating takes place exclusively on the second burner as a natural gas or heating burner. This can be done during the opening hours of the Doors be the case. After opening the doors, the first burner is not switched on again as a shielding gas burner until the furnace pressure has reached a specified nominal value.
  • a main valve such as a valve
  • Solenoid valve closed, the fan switched off and a shut-off valve opened.
  • the second burner such as natural gas burner or heating burner, takes over the heating of the preheating furnace.
  • the pre-pressure before the first burner is used.
  • the target is a pre-printed form of e.g. about 20-30 mbar constant. If this pressure drops, the speed of the fan is increased via the frequency converter.
  • the method according to the invention involving the steps described above and a related device on an industrial furnace designed as a pusher run with a high-temperature furnace upstream preheating oven so that the performance of the first burner is continuously controlled as a protective gas burner during operation in the preheating oven to the optimally utilize the amount of inert gas available to the high-temperature furnace:
  • the available amount of inert gas is initially determined by the fact that the burnup of the high temperature furnace and possibly the oil bath adjusted with respect to the Ausströmvolumens and beyond the weight load of check valves at the Abbrandstellen the furnace pressure can be set at the first commissioning of the system.
  • the high temperature furnace is continuously gassed with inert gas.
  • the protective gas volume flow is fixed, with which the first burner can be supplied as inert gas burner. It is created the condition that just as much inert gas can be burned as quasi heating gas, as would flow out of the burn-off point at the entrance lock of the high-temperature furnace according to the prior art or otherwise.
  • the furnace pressure of the high-temperature furnace serves as a controlled variable for the first burner, the furnace pressure of the high-temperature furnace. If the furnace pressure rises, an air control flap in front of the first burner is opened further, whereby the power and thus the gas consumption of the first burner increases.
  • the speed of the fan is increased by means of a frequency converter, whereby the delivery volume increases.
  • the speed is increased until a constant pre-pressure in front of the first burner of e.g. 20-30 mbar.
  • the air control flap is closed again to reduce the power of the first burner.
  • the burn-off point of the high-temperature furnace is opened during the leak-tightness control, since no gas is removed from the furnace via the first burner in this state (ie currently). Only when the tightness check has been successfully completed will the first burner be started and the burn-off point will be closed.
  • the processes according to the invention have the effect that the operation of the first burner as a protective gas burner takes precedence over the second burner as a heating burner.
  • the amount of gas temporarily removed from the high-temperature furnace should lead to a slight increase in the furnace pressure, this can be controlled to a limited extent, especially since correspondingly more gas is emitted via the burn-off point - such as, for example. at the oil bath - is dischargeable.
  • the first burner is switched off at a maximum value of the furnace pressure which still has to be defined, and the burning point at the entrance lock is opened. This will quickly reduce the furnace pressure again. If the preheat furnace needs heating energy of this kind again, the first burner will be switched on anyway.
  • the first burner is switched on again as a protective gas burner when the furnace pressure has reached the setpoint.
  • the main valve is closed according to the invention, the fan is switched off and the shut-off valve is opened.
  • the second burner takes over the heating of the preheating furnace.
  • the pre-pressure upstream of the first burner is used as the controlled variable for the frequency converter of the blower.
  • the aim is to obtain a pre-printed form of e.g. 20-30 mbar constant. If the pressure drops, the speed of the fan is increased via the frequency converter.
  • an industrial furnace 1 designed as a pusher furnace installation comprises a high-temperature furnace 2 with a door 2.1 for loading and a door for discharge 2.2 of batches of heat-treatable components and an exhaust gas burner 2.4 arranged at a combustion point 2.5, to which a shut-off valve 2.5.1 and an overpressure flap 2.8 are assigned.
  • the high-temperature furnace 2 is preceded by a Vorierrmofen 3 with a door for loading 3.5 and a door for discharging 3.6 to be treated with preheat batches of components comprising a first burner 3.1 with the first control device 3.1.1 and a second burner 3.2 with second control 3.2. 1 has.
  • the thus formed industrial furnace 1 is a supply line for a heating gas 4 with a tightness control unit 4.1, a supply line with a main valve 5.1 for a by means of a blower 7 eligible, by means of a gas cooling device 2.6 cooled and controllable by a third control device 2.7 inert gas 5 and a supply line for air 6 associated with an air damper 6.1 as throttle.
  • a control and regulation unit 8 links the first control device 3.1.1, second control device 3.2.1 and third control device for the functions of the process according to the process for the use according to the invention of the resulting protective gas as a heating gas according to the method described below.
  • FIG. 2 From the Fig. 2 the process according to the procedure of the use of the resulting protective gas as heating gas in a program algorithm is shown in a comprehensible manner.
  • This is stored in the control and regulating unit 8, so that the first burner 3.1 is operated mainly in front of the second burner 1.2 for heating the industrial furnace 1, the second burner 3.2 is then switched on and operated when one to achieve a temperature setpoint of Industrial furnace 1 required power of the first burner 3.1 is exceeded, and the second burner 3.2 is then turned off and not operated when the temperature set point is reached.
  • a program is presented to automatically run the method according to the invention by means of the control and regulating unit 8.
  • the program ensures that to perform the leak check before the main valve 5.1 of the supply line for shielding gas 5, a form by means of the blower 7 is set, which acts against the closed main valve 5.1, wherein the burn-off 2.5 is opened during the tightness control and the first burner 3.1 1 no protective gas is supplied.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Furnace Details (AREA)
  • Air Supply (AREA)
  • Tunnel Furnaces (AREA)
EP12002334A 2011-04-05 2012-03-30 Procédé et four industriel pour l'exploitation d'un gaz protecteur utilisé comme gaz de chauffage Withdrawn EP2508829A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011016175A DE102011016175A1 (de) 2011-04-05 2011-04-05 Verfahren und Industrieofen zur Nutzung eines anfallenden Schutzgases als Heizgas

Publications (1)

Publication Number Publication Date
EP2508829A1 true EP2508829A1 (fr) 2012-10-10

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EP12002334A Withdrawn EP2508829A1 (fr) 2011-04-05 2012-03-30 Procédé et four industriel pour l'exploitation d'un gaz protecteur utilisé comme gaz de chauffage

Country Status (5)

Country Link
US (1) US9188392B2 (fr)
EP (1) EP2508829A1 (fr)
JP (1) JP2012220185A (fr)
CN (1) CN102735068B (fr)
DE (1) DE102011016175A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108534544A (zh) * 2018-05-24 2018-09-14 浙江中硅新材料有限公司 一种加热炉的陶瓷辊组件

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5430339B2 (ja) 2009-10-19 2014-02-26 株式会社ワコム 位置検出装置及び位置指示器
DE102013014816A1 (de) * 2013-09-10 2015-03-12 Ipsen International Gmbh Verfahren zum Beheizen eines Industrieofens, sowie Heizvorrichtung für einen Industrieofen
DE102014118693A1 (de) * 2014-12-16 2016-06-16 Jasta-Armaturen Gmbh & Co. Kg Industrieofen
US20170074589A1 (en) 2015-09-11 2017-03-16 Ipsen Inc. System and Method for Facilitating the Maintenance of an Industrial Furnace
CN111413049B (zh) * 2020-03-04 2022-04-26 首钢京唐钢铁联合有限责任公司 一种检测加热炉烧嘴快切阀泄漏的方法及装置
CN112178914A (zh) * 2020-10-09 2021-01-05 苏州金猫咖啡有限公司 一种喷雾干燥塔用直燃热风系统的控制方法

Citations (4)

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Publication number Priority date Publication date Assignee Title
EP0282715A2 (fr) 1987-03-05 1988-09-21 Otto Junker GmbH Procédé pour réduire l'émission de substances nocives dans un four de réchauffage sous atmosphère protectrice
DE3432952C2 (de) 1984-09-07 1994-09-22 Linde Ag Verfahren und Vorrichtung zum Wärmebehandeln von metallischen Werkstücken
DE19720620A1 (de) 1997-02-25 1998-08-27 Linde Ag Verfahren und Einrichtung zur Nutzung des Energieinhalts des aus einer Wärmebehandlung abfließenden Behandlungsgases
DE102008020449A1 (de) 2008-04-01 2009-10-15 Manfred Husslein Industrieofen sowie Verfahren zum Betrieb eines Industrieofens

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US4869730A (en) * 1988-05-27 1989-09-26 Holcroft/Loftus, Inc. Endothermic gas generator
US5269171A (en) * 1992-04-15 1993-12-14 Ferrellgas, Inc. Propane gas leak detection
DE9313451U1 (de) * 1993-09-07 1993-11-04 Ipsen Industries International GmbH, 47533 Kleve Schutzgasofen
EP1143197B1 (fr) * 1998-12-01 2017-03-29 Ebara Corporation Dispositif de traitement des gaz d'echappement
US6179212B1 (en) * 1999-02-04 2001-01-30 Edward J. Banko Variable output multistage gas furnace
WO2005050768A1 (fr) * 2003-11-19 2005-06-02 Questair Technologies Inc. Systemes de piles a combustible a haut rendement a oxyde solide a suivi de charge
JP4357517B2 (ja) * 2006-10-16 2009-11-04 株式会社東芝 ナノカーボン生成装置
JP2009019786A (ja) * 2007-07-10 2009-01-29 Kobe Steel Ltd 回転炉床式還元炉の排ガス処理装置および方法
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JP5544732B2 (ja) * 2009-03-17 2014-07-09 Ｔｄｋ株式会社 連続焼成炉および製造システム
DE102009038598B4 (de) * 2009-08-26 2017-06-22 Ipsen International Gmbh Verfahren und Vorrichtung zur Aufbereitung von Prozessgasen für Wärmebehandlungen von metallischen Werkstoffen/Werkstücken in Industrieöfen
DE102009058642A1 (de) * 2009-12-16 2011-06-22 Ipsen International GmbH, 47533 Verfahren und Einrichtung zur Regelung von Prozessgasen für Wärmebehandlungen von metallischen Werkstoffen/Werkstücken in Industrieöfen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3432952C2 (de) 1984-09-07 1994-09-22 Linde Ag Verfahren und Vorrichtung zum Wärmebehandeln von metallischen Werkstücken
EP0282715A2 (fr) 1987-03-05 1988-09-21 Otto Junker GmbH Procédé pour réduire l'émission de substances nocives dans un four de réchauffage sous atmosphère protectrice
DE19720620A1 (de) 1997-02-25 1998-08-27 Linde Ag Verfahren und Einrichtung zur Nutzung des Energieinhalts des aus einer Wärmebehandlung abfließenden Behandlungsgases
DE102008020449A1 (de) 2008-04-01 2009-10-15 Manfred Husslein Industrieofen sowie Verfahren zum Betrieb eines Industrieofens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108534544A (zh) * 2018-05-24 2018-09-14 浙江中硅新材料有限公司 一种加热炉的陶瓷辊组件

Also Published As

Publication number Publication date
US9188392B2 (en) 2015-11-17
CN102735068A (zh) 2012-10-17
DE102011016175A1 (de) 2012-10-11
CN102735068B (zh) 2016-03-23
US20120276494A1 (en) 2012-11-01
JP2012220185A (ja) 2012-11-12

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