EP0553632A2 - Commande d'un four industriel - Google Patents

Commande d'un four industriel Download PDF

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Publication number
EP0553632A2
EP0553632A2 EP93100347A EP93100347A EP0553632A2 EP 0553632 A2 EP0553632 A2 EP 0553632A2 EP 93100347 A EP93100347 A EP 93100347A EP 93100347 A EP93100347 A EP 93100347A EP 0553632 A2 EP0553632 A2 EP 0553632A2
Authority
EP
European Patent Office
Prior art keywords
furnace
exhaust gas
oxygen
temperature
industrial
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.)
Granted
Application number
EP93100347A
Other languages
German (de)
English (en)
Other versions
EP0553632A3 (fr
EP0553632B1 (fr
Inventor
Wilfried Dipl.-Ing. Lissack
Eberhard Lohse
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.)
Linde GmbH
Original Assignee
Linde 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 Linde GmbH filed Critical Linde GmbH
Publication of EP0553632A2 publication Critical patent/EP0553632A2/fr
Publication of EP0553632A3 publication Critical patent/EP0553632A3/xx
Application granted granted Critical
Publication of EP0553632B1 publication Critical patent/EP0553632B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F27D2019/0018—Monitoring the temperature of the atmosphere of the kiln
    • F27D2019/0021—Monitoring the temperature of the exhaust 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
    • F27D2019/0028—Regulation
    • F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
    • F27D2019/004—Fuel quantity
    • F27D2019/0043—Amount of air or O2 to the burner

Definitions

  • the invention relates to a method for operating industrial furnaces, the exhaust gases of which are burned in the exhaust pipe.
  • burner-heated melting furnaces are very often used. If, for example, cast iron is melted in a rotary drum furnace, a batch of approx. 2 to 10 t is heated to a tapping temperature of approx.
  • the rotary drum furnaces are usually heated by burners which are located on the front of the furnace and whose flame extends into the interior of the furnace. Through an opening, which is usually on the opposite side of the burner, the exhaust gases escape from the furnace through a pipe to the chimney.
  • the object of the present invention is therefore to develop an improved method for operating industrial furnaces, the exhaust gases of which are burned in the exhaust gas line, by means of which the above-mentioned disadvantages are avoided and, in particular, more energy-efficient furnace operation is made possible and the thermal load on the exhaust gas filters is reduced.
  • This object is achieved in that the temperature of the exhaust gas is measured continuously and the oxygen content in the atmosphere of the industrial furnace is increased when a predetermined target value of the measured exhaust gas temperature is exceeded.
  • the measured temperature of the exhaust gas at one point in the pipe to the chimney can thus be equated with the relative CO content in the furnace atmosphere (if the H2 content is neglected). This results in a simple and maintenance-free method for continuously monitoring the CO content inside the furnace.
  • the invention now enables for the first time the advantageous possibility of controlled combustion of the carbon monoxide released in the atmosphere of industrial furnaces. All processes in which carbon monoxide (and hydrogen) is generated in the furnace atmosphere and which is subsequently burned in the exhaust gas are considered. For the controlled combustion of carbon monoxide and hydrogen, the oxygen content in the atmosphere of the industrial furnace is increased when a predetermined target value of the measured exhaust gas temperature is exceeded.
  • the proportion of oxygen in the furnace atmosphere can be increased by direct injection into the interior of the furnace, for example via lances of oxygen or an oxygen-containing gas.
  • the oxygen can advantageously be directly be fed to the inside of the furnace via the burner. If the measured flue gas temperature exceeds the specified setpoint, additional oxygen is introduced into the interior of the furnace through a corresponding control system until the flue gas temperature falls below the setpoint again.
  • the amount of fuel that is supplied to the burners can advantageously be reduced while the oxygen supply is kept constant, even if the predetermined target value of the measured exhaust gas temperature is exceeded. This results in direct fuel savings when lighting the industrial furnace.
  • the suitable setpoint temperature is sensibly determined by a test when the industrial furnace is started up for the first time.
  • a thermocouple can be introduced into the exhaust pipe, for example, behind the last supply opening for air or for another oxidizing agent.
  • the temperature of the exhaust gas burning with the air or the oxidizing agent is then determined.
  • the respective temperature corresponds to the relative CO content plus the H2 content inside the furnace.
  • a setpoint in the range of 120 to 650 ° C is selected.
  • melting cast iron it is around 150 to 250 ° C due to the maximum temperature for the downstream filter system, depending on the pipe length of the flue gas pipes connected to the thermocouple.
  • a rotary drum furnace 1 is shown schematically, the burner 2 that heats it, the lines 3 and 4 supplying the burner with oxygen and fuel, the exhaust pipe 10 and the air gaps 6 and 7 located therein. Behind the last air gap 7, a thermocouple 8 is arranged in the interior of the exhaust gas line 10, which is connected to the sensor 9.
  • the carbon contained in the feed is partially oxidized to carbon monoxide and carbon dioxide during melting by the oxygen in the furnace atmosphere, so that carburizing agents have to be added to the feed to compensate for the loss of carbon.
  • measurements of the CO content in the dry flue gas give maximum values of 35% carbon monoxide in the flue gas directly on the front of the furnace.
  • the temperature of the exhaust gas burning with air in the exhaust gas line 10 is measured for a certain time by means of the thermocouple 8 and the transducer 9.
  • setpoint temperatures 150 ° C to 250 ° C are useful.
  • a setpoint temperature of 230 ° C is set on the controller (not shown). This controller is connected to a control valve in the O2 supply line 3 to the burner 2.
  • the proportion of oxygen in the atmosphere of the furnace 1 is increased according to the invention. This is achieved by over-stoichiometric combustion of the fuel-oxygen mixture in furnace 1.
  • the oxygen supply to burner 2 increases that the carbon monoxide can be completely oxidized to carbon dioxide (and the hydrogen burns).
  • the energy thus far released in the exhaust gas line 10 is already released in the furnace 1 by the method according to the invention. As a result, the exhaust gas temperature drops and the control loop in turn lowers the oxygen supply to burner 2.
  • the CO combustion regulated in accordance with the invention in the rotary drum furnace 1 has several advantages:
  • the released combustion energy of the carbon monoxide can still be used in the furnace 1.
  • the amount of oxygen supplied to furnace 1 is also throttled, so that burn-off of alloying elements is prevented.
  • the exhaust gas temperature is lower during the entire operation of the rotary drum furnace 1, so that the filters are no longer thermally overloaded.
  • the exhaust gas volume becomes lower since the carbon monoxide in the furnace 1 is burned with oxygen instead of air in the exhaust gas lines 10.
  • the method according to the invention uses a simple temperature measurement to determine the relative carbon monoxide content in the furnace instead of the gas analysis of the furnace atmosphere, which is technically difficult to control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Treatment Of Sludge (AREA)
  • Furnace Details (AREA)
  • Control Of Heat Treatment Processes (AREA)
EP93100347A 1992-01-31 1993-01-12 Commande d'un four industriel Expired - Lifetime EP0553632B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4202827 1992-01-31
DE4202827A DE4202827A1 (de) 1992-01-31 1992-01-31 Geregelter betrieb von industrieoefen

Publications (3)

Publication Number Publication Date
EP0553632A2 true EP0553632A2 (fr) 1993-08-04
EP0553632A3 EP0553632A3 (fr) 1994-01-05
EP0553632B1 EP0553632B1 (fr) 1996-11-27

Family

ID=6450725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93100347A Expired - Lifetime EP0553632B1 (fr) 1992-01-31 1993-01-12 Commande d'un four industriel

Country Status (7)

Country Link
EP (1) EP0553632B1 (fr)
AT (1) ATE145723T1 (fr)
CZ (1) CZ289075B6 (fr)
DE (2) DE4202827A1 (fr)
ES (1) ES2094384T3 (fr)
HU (1) HU216008B (fr)
SK (1) SK283426B6 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995034791A1 (fr) * 1994-06-16 1995-12-21 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de fusion d'une charge metallique dans un four rotatif et four rotatif pour la mise en ×uvre d'un tel procede
FR2777075A1 (fr) * 1998-04-02 1999-10-08 Air Liquide Procede de conduite d'un four et dispositif pour la mise en oeuvre du procede
EP1243663A3 (fr) * 2001-03-23 2003-10-01 Linde AG Procédé et dispositif pour la fusion de déchets d'aluminium
EP2078759A1 (fr) * 2008-01-09 2009-07-15 SUG Schmelz- und Giessanlagen GmbH & Co. KG Four ä tambour rotatif pour la récupération par fusion des métaux lourds
CN102138051A (zh) * 2008-08-29 2011-07-27 乔治洛德方法研究和开发液化空气有限公司 用于运行炉子的方法和用于实施该方法的设备
EP2664884A1 (fr) 2012-05-18 2013-11-20 Air Products and Chemicals, Inc. Procédé et appareil pour chauffer des métaux
EP4033149A1 (fr) * 2021-01-22 2022-07-27 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Surveillance de matières combustibles dans un flux gazeux

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2130974B1 (es) * 1997-01-29 1999-12-16 Fundacion Inasmet Sistema para la mejora energetica en un horno rotativo de fusion por oxicombustion para la fabricacion de fundicion de hierro.
FR2959298B1 (fr) 2010-04-23 2012-09-21 Air Liquide Four a flamme et procede de regulation de la combustion dans un four a flamme

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1375179A (fr) * 1962-10-04 1964-10-16 Huettenwerk Oberhausen Ag Procédé et dispositif de mesure de la teneur en co des gaz de combustion dans l'affinage au vent de l'acier, notamment pour la surveillance de la marche de la décarburation
US3653650A (en) * 1968-12-27 1972-04-04 Yawata Iron & Steel Co Method of controlling the exhaust gas flow volume in an oxygen top-blowing converter
DE4026414A1 (de) * 1990-08-21 1992-02-27 Linde Ag Verfahren zur verringerung von schadstoffen in den abgasen brennerbefeuerter schmelzoefen

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995034791A1 (fr) * 1994-06-16 1995-12-21 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de fusion d'une charge metallique dans un four rotatif et four rotatif pour la mise en ×uvre d'un tel procede
US6039786A (en) * 1994-06-16 2000-03-21 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation De Procedes Georges Claude Process for melting a metal charge in a rotary furnace and rotary furnace for implementing such a process
FR2777075A1 (fr) * 1998-04-02 1999-10-08 Air Liquide Procede de conduite d'un four et dispositif pour la mise en oeuvre du procede
EP0949477A1 (fr) * 1998-04-02 1999-10-13 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de conduite d'un four et dispositif pour la mise en oeuvre du procédé
US6247416B1 (en) 1998-04-02 2001-06-19 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method of operating a furnace and device for implementing the method
EP1243663A3 (fr) * 2001-03-23 2003-10-01 Linde AG Procédé et dispositif pour la fusion de déchets d'aluminium
EP2078759A1 (fr) * 2008-01-09 2009-07-15 SUG Schmelz- und Giessanlagen GmbH & Co. KG Four ä tambour rotatif pour la récupération par fusion des métaux lourds
CN102138051A (zh) * 2008-08-29 2011-07-27 乔治洛德方法研究和开发液化空气有限公司 用于运行炉子的方法和用于实施该方法的设备
CN102138051B (zh) * 2008-08-29 2013-11-06 乔治洛德方法研究和开发液化空气有限公司 用于运行炉子的方法和用于实施该方法的设备
US8721764B2 (en) 2008-08-29 2014-05-13 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for operating a furnace and device for carrying out the method
EP2664884A1 (fr) 2012-05-18 2013-11-20 Air Products and Chemicals, Inc. Procédé et appareil pour chauffer des métaux
US9091484B2 (en) 2012-05-18 2015-07-28 Air Products And Chemicals, Inc. Method and apparatus for heating metals
EP4033149A1 (fr) * 2021-01-22 2022-07-27 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Surveillance de matières combustibles dans un flux gazeux
WO2022157304A1 (fr) * 2021-01-22 2022-07-28 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Surveillance de matière combustible dans un flux gazeux

Also Published As

Publication number Publication date
DE59304559D1 (de) 1997-01-09
SK367392A3 (en) 1994-05-11
DE4202827A1 (de) 1993-08-05
EP0553632A3 (fr) 1994-01-05
HUT68734A (en) 1995-07-28
ES2094384T3 (es) 1997-01-16
HU216008B (hu) 1999-04-28
ATE145723T1 (de) 1996-12-15
HU9300215D0 (en) 1993-04-28
EP0553632B1 (fr) 1996-11-27
CZ367392A3 (en) 1993-08-11
CZ289075B6 (cs) 2001-10-17
SK283426B6 (sk) 2003-07-01

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