EP2846119A1 - Verfahren zum Beheizen eines Industrieofens, sowie Heizvorrichtung für einen Industrieofen - Google Patents

Verfahren zum Beheizen eines Industrieofens, sowie Heizvorrichtung für einen Industrieofen Download PDF

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Publication number
EP2846119A1
EP2846119A1 EP14002817.6A EP14002817A EP2846119A1 EP 2846119 A1 EP2846119 A1 EP 2846119A1 EP 14002817 A EP14002817 A EP 14002817A EP 2846119 A1 EP2846119 A1 EP 2846119A1
Authority
EP
European Patent Office
Prior art keywords
process gas
gas
heating
burner
industrial furnace
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Withdrawn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
EP14002817.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Rolf Sarres
Marc Angenendt
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 EP2846119A1 publication Critical patent/EP2846119A1/de
Withdrawn legal-status Critical Current

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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
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames
    • 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 specially adapted for furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • 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
    • F27D17/10—Arrangements for using waste heat
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
    • 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 specially adapted for furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • F27D17/20—Arrangements for treatment or cleaning of waste gases
    • 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
    • F27D19/00—Arrangements of controlling devices
    • 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
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • 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
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F27D2007/063—Special atmospheres, e.g. high pressure atmospheres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D2099/006—Auxiliary heating, e.g. in special conditions or at special times

Definitions

  • the invention relates to a method for heating an industrial furnace, wherein an internal combustion heater of the industrial furnace is supplied in the course of a heat treatment cycle in addition to fuel gas and combustible process gas. Furthermore, the invention relates to a heating device for an industrial furnace, as well as an industrial furnace.
  • process gases are usually used which serve to protect the surface of the charge to be treated in the respective industrial furnace or to change the chemical composition of this charge.
  • this process gas consists essentially of the components hydrogen, carbon monoxide and nitrogen together and is fed in the course of the heat treatment of the introduced batch continuously to an interior of the respective industrial furnace.
  • the process gas passed through the interior is then usually discharged as furnace exhaust gas into the open air, wherein due to the flammability and toxicity of the gas flaring of the process gas is made on exiting.
  • methods are also known as an alternative to the flaring, in which the discharged process gas is used for heating the respective industrial furnace.
  • the industrial furnace comprises a heating device, in which a line connects a process exhaust outlet of the industrial furnace with the burner device and thus realizes the supply of the discharged process gas to burners of the burner device.
  • a line connects a process exhaust outlet of the industrial furnace with the burner device and thus realizes the supply of the discharged process gas to burners of the burner device.
  • various gas switching and control elements are arranged.
  • a heating device for an industrial furnace comprises, in particular, a line for connecting a process exhaust gas outlet of an industrial furnace or an intermediate storage device to a burner device, wherein process gas can be conducted from the process exhaust gas outlet to the burner device via this line.
  • a batch furnace such as a chamber furnace or a multi-purpose chamber furnace, or even a continuous or semi-continuous furnace, such as a pusher furnace, a rotary hearth furnace, a roller hearth furnace, a conveyor belt furnace, etc.
  • a continuous or semi-continuous furnace such as a pusher furnace, a rotary hearth furnace, a roller hearth furnace, a conveyor belt furnace, etc.
  • the process gas fed to the burner device is, in particular, what is known as endogas, which was originally produced in a generator from atmospheric oxygen and natural gas and then used in a heat treatment cycle for surface protection of a respective heat treatment material or for altering its chemical composition.
  • it may also be hydrogen, carbon monoxide and nitrogen-containing process gas, which is formed by reaction of introduced into the heat treatment furnace gaseous or liquid hydrocarbons such as natural gas, propane, methanol, acetone, etc. in the oven.
  • the process gas which is used in the context of the heat treatment cycle of the respective industrial furnace for heating, either from be removed from the same industrial furnace or even from one or more separate industrial furnace in the course of taking place there heat treatment cycles.
  • the conduit of the heater of the present invention may connect either the process exhaust outlet and the burner apparatus of one and the same industrial furnace, or may establish communication between the burner apparatus of an industrial furnace and the process exhaust outlet of another industrial furnace or intermediate storage.
  • the invention now includes the technical teaching that the heat treatment cycle is subdivided into a plurality of process phases and the supply of the process gas to the burner device is regulated in a process-phase-dependent manner.
  • the heat treatment cycle is subdivided into a plurality of process phases and the supply of the process gas to the burner device is regulated in a process-phase-dependent manner.
  • thermoelectric heating device means are provided for this purpose in the line, via which a supply of the process gas to the burner device process phase dependent can be automatically controlled. Accordingly, these means arranged in the line are suitable for the regulation of an automatic supply of process gas as a function of process phases of the heat treatment cycle.
  • the inventive method has the advantage that a supply of combustible process gas to the burner device so that can be easily controlled so that this supply made specifically only in process phases in which a composition of the process gas exhausted from an interior of an industrial furnace is suitable for combustion in the burner apparatus. Because depending on the particular process phase and also the type of industrial furnace, the composition of the process gas and thus its calorific value and burning behavior can vary greatly.
  • the furnace exhaust gas discharged at the beginning of a heat treatment cycle is not suitable for heating, since an interior of the respective industrial furnace completely burns out during a batch change and, consequently, only a small amount of combustible process gas can be recycled.
  • chemical contaminants frequently evaporate from the surface of a newly introduced charge during a heating phase of the respective furnace and contaminate the discharged process gas.
  • These impurities may be detergent residues, residues of cooling lubricant from the machining or forming of the batch, as well as hardness protection agents, which are each applied to the surface of the batch.
  • the latter consist of a wide variety of chemical compounds and contaminate the process gas with volatiles, which would result in a significant deterioration of combustion in the burner device of the furnace.
  • the heating of this industrial furnace can be optimized by the process phase-dependent supply of process gas to a burner device of an industrial furnace.
  • At least one burner of the burner device is supplied with the process gas during the supply of process gas to the burner device. It is inventively conceivable that while several burners are acted upon by the process gas simultaneously. Alternatively, however, when supplying process gas to the burner device, a plurality of burners of the burner device are supplied one after the other or in groups, in particular in pairs, clocked with the process gas, so that not all burners supplied with the process gas are operated at the same time but similar to an all-round circuit. This can be done in particular if in a process phase a particular desired temperature must be maintained and for this the operation of a single or less burner is sufficient. In addition, burners to be operated conventionally with heating gas can be switched off when supplying process gas to the burner device or operated simultaneously with heating gas, for example in order to be able to display sufficient heating of the industrial furnace despite the lower heating value of the process gas.
  • At least one burner of the burner device in the context of the heat treatment cycle with fuel gas and / or supplied with process gas when supplied with process gas.
  • at least one burner of the burner device is designed as a so-called duplex burner, which can be operated with the heating gas and / or with the process gas.
  • duplex burner Such a configuration has the advantage that thus a total number to be provided burners can be kept low, since at least some of the otherwise regularly operated with fuel gas burners can be supplied with the supplied process gas and fired.
  • the respective duplex burner is supplied in normal operation only with fuel gas and when supplying process gas only with process gas or supply of process gas supply to the duplex burner with a mixture of heating gas and process gas.
  • the first process phase is a heating phase or a first heating phase in which a supply of process gas due to the contamination of the process gas is not required.
  • the at least one subsequent process phase may be a second heating phase in which no further contamination of the process gas is to be expected.
  • it may also be one or more holding phases, in which the temperature of the interior on the is to maintain the respective process temperature. Under certain circumstances, these can also be interrupted by an intermediate cooling phase in which a supply of process gas is either permitted or prevented.
  • the target temperature of the first process phase may correspond to the process temperature of the subsequent process phase or even be lower.
  • the process gas is conveyed when it is supplied to the burner device via a fan dependent frequency-controlled fan.
  • a sufficient pressure build-up in front of the at least one burner of the burner device can be represented and, on the other hand, prevented by discharging too high an amount of process gas from an interior of the furnace creates a negative pressure in the interior and thus the risk of ingress of ambient air given the interior.
  • the means provided in the line comprise at least one valve, which is designed in particular as a solenoid valve. Furthermore, a valve is preferably followed by the furnace pressure-dependent frequency-controlled blower, so that on the one hand via the at least one valve, a supply of process gas can be completely suppressed, but at the same time a volume control via the blower is possible.
  • this process exhaust gas outlet is preferred Assigned safety burner with overpressure flap, via which the process gas can be torched when not supplied to the burner device or at too high a pressure.
  • the burners of the burner device are preferably designed as radiant tube burners whose jet tubes are led into the interior of the respective industrial furnace.
  • the heating device according to the invention can be present as an integral part of an industrial furnace or as a retrofit unit in an industrial furnace.
  • Fig. 1 is a schematic view of an industrial furnace forth, which is designed in the present case as a multipurpose chamber furnace.
  • the industrial furnace In this case, it has a housing 1, the interior of which is divided by a slide 2 into a main chamber 3 and an antechamber 4, and in which a charge 6 to be heat-treated can be received via a loading door 5 provided in the region of the pre-chamber 4.
  • a quenching bath 7 is further provided, in which the then transferred into the prechamber 4 batch 6 can be immersed.
  • this heating device 8 comprises a burner device 9 with a plurality of burners 10 and 11, which are each designed as a radiant tube burner and of which in Fig. 2 only the burner 10 can be seen.
  • the burners 10 and 11 are each supplied with a heating gas, preferably in the form of natural gas, and air, and heat up the interior of the main chamber 3 as a result of the heat generated during the burning of the heating gas.
  • a process gas is supplied to the interior of the housing 1 in order to protect the surface of the charge 6 in the course of the heat treatment and, if necessary, to bring about a change in the chemical composition of the charge 6.
  • this process gas which is preferably endogas, is supplied to the interior space in the region of the main chamber 3 via a gas inlet 12 and flows through the main chamber 3 where it comes into contact with the charge 6. Starting from the main chamber 3, the process gas then flows into the pre-chamber 4 and is discharged there via a process exhaust outlet 13 again.
  • the process exhaust outlet 13 is connected via a line 14 to the burner device 9, so that the discharged process gas of the burner device 9 and in this case the burners 10 and 11th can be supplied.
  • the line 14, as in Fig. 2 can be seen, a ring line 15 for process gas, from which the individual burners 10 and 11, the process gas can be supplied.
  • the supply to the ring line 15 takes place via a provided in the line 14 frequency-controlled fan 16, which is regulated in response to a pressure in the interior of the housing 1.
  • the discharged process gas is not conveyed continuously to the burner device 9, but a feed is realized as a function of process phases of the heat treatment cycle of the charge 6.
  • the blower 16 is preceded by a solenoid valve 17, which can be actuated via a higher-level furnace control 18, which also controls further solenoid valves 19 to 22 in the region of the heating device 8.
  • the furnace controller 18 can regulate, on the one hand, in general a supply of process gas discharged via the process exhaust gas outlet 13 to the heating device 8 and here the burner device 9, and then within the heating device 8 via the solenoid valves 19 to 22 either to supply the burners 10 and 11 represented with fuel gas and air or with supplied process gas and air or with both gas variants.
  • the burners 10 and 11 are in the present case in each case designed as so-called duplex burners, which can be operated either with heating gas or with process gas, as well as a mixture of both types of gas.
  • the process gas discharged via the process exhaust outlet 13 is mixed with air from a ring line 23 before flowing to the burners 10 and 11.
  • the ring line 23 also serves to supply the burners 10 and 11 in their operation by means of heating gas, in which case also heating gas from a ring line 24 by opening the corresponding valves 19 and 20 is supplied.
  • Flaring device 25 is provided, on which the discharged process gas is flared with the solenoid valve 17 closed from reaching a certain pressure in the interior of the housing 1.
  • the heating of the industrial furnace can now be represented as follows during a heat treatment cycle of the charge 6:
  • a first process phase in which the charge 6 is introduced via the loading door 5 into the interior of the housing 1 and subsequently moved into the main chamber 3, as well as Interior is then heated to a target temperature, the burners 10 and 11 are supplied only with fuel gas and air, while about the process exhaust outlet 13 possibly discharged process gas is burned by the flaring device 25.
  • the background is that when opening the loading door 5 for a certain period of time no or too flammable process gas to the burner device 9 can be performed because the interior of the housing 1 burns completely in the course of opening.
  • contamination of the process gas with contaminants evaporating from a surface of the charge 6 may occur, which could possibly result in impairment of supply to the burner means 9.
  • a supply of the burner 10 and 11 is switched over the furnace control 18 by the solenoid valve 17 is opened and the fan 16 is controlled in dependence of the furnace pressure.
  • both burners 10 and 11 can be operated with process gas or can be supplied with the process gas individually or in succession. It is also conceivable that one of the burners 10 and 11 in this case is not or regularly operated with fuel gas.
  • An appropriate control can be Oven control 18 by appropriate control of the solenoid valves 19 to 22 make.
  • a final process phase in which the charge 6 is transferred from the main chamber 3 in the region of the prechamber 4 and then lowered into the quench bath 7, the supply of process gas to the heater 8 is then prevented by closing the solenoid valve 17 again, as in Course of quenching hard oil is evaporated, which would cause corresponding soot supply 10 and 11 to the burners. Subsequently, the batch 6 is then removed via the loading door 5 and possibly fed to a new batch.
  • further process phases may be provided between the holding phase and this last process phase, in which case either supply of process gas to the heating device 8 is performed or prevented.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Tunnel Furnaces (AREA)
EP14002817.6A 2013-09-10 2014-08-13 Verfahren zum Beheizen eines Industrieofens, sowie Heizvorrichtung für einen Industrieofen Withdrawn EP2846119A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013014816.2A DE102013014816A1 (de) 2013-09-10 2013-09-10 Verfahren zum Beheizen eines Industrieofens, sowie Heizvorrichtung für einen Industrieofen

Publications (1)

Publication Number Publication Date
EP2846119A1 true EP2846119A1 (de) 2015-03-11

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EP14002817.6A Withdrawn EP2846119A1 (de) 2013-09-10 2014-08-13 Verfahren zum Beheizen eines Industrieofens, sowie Heizvorrichtung für einen Industrieofen

Country Status (5)

Country Link
US (1) US20150072297A1 (enrdf_load_stackoverflow)
EP (1) EP2846119A1 (enrdf_load_stackoverflow)
CN (1) CN104419810A (enrdf_load_stackoverflow)
DE (1) DE102013014816A1 (enrdf_load_stackoverflow)
IN (1) IN2014DE02470A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170074589A1 (en) 2015-09-11 2017-03-16 Ipsen Inc. System and Method for Facilitating the Maintenance of an Industrial Furnace

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19720620A1 (de) 1997-02-25 1998-08-27 Linde Ag Verfahren und Einrichtung zur Nutzung des Energieinhalts des aus einer Wärmebehandlung abfließenden Behandlungsgases
DE102011016175A1 (de) * 2011-04-05 2012-10-11 Ipsen International Gmbh Verfahren und Industrieofen zur Nutzung eines anfallenden Schutzgases als Heizgas

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1097232A (en) * 1964-05-14 1968-01-03 Oatley Technical Dev Improvements relating to gas fires
CA2194805C (en) * 1997-01-10 2004-04-27 Richard Bouziane Batch process for recycling hydrocarbon containing used material
US5997280A (en) * 1997-11-07 1999-12-07 Maxon Corporation Intelligent burner control system
CN101638713B (zh) * 2008-07-30 2011-03-23 陈邱生 热处理废热应用于黑化过程的装置
CN201762379U (zh) * 2010-07-16 2011-03-16 三永电热机械股份有限公司 回火炉辅助加热装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19720620A1 (de) 1997-02-25 1998-08-27 Linde Ag Verfahren und Einrichtung zur Nutzung des Energieinhalts des aus einer Wärmebehandlung abfließenden Behandlungsgases
DE102011016175A1 (de) * 2011-04-05 2012-10-11 Ipsen International Gmbh Verfahren und Industrieofen zur Nutzung eines anfallenden Schutzgases als Heizgas

Also Published As

Publication number Publication date
US20150072297A1 (en) 2015-03-12
CN104419810A (zh) 2015-03-18
IN2014DE02470A (enrdf_load_stackoverflow) 2015-06-26
DE102013014816A1 (de) 2015-03-12

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