EP2655995A1 - Procédé pour faire fonctionner un four dans une installation de travail des métaux et installation de travail des métaux - Google Patents

Procédé pour faire fonctionner un four dans une installation de travail des métaux et installation de travail des métaux

Info

Publication number
EP2655995A1
EP2655995A1 EP11804698.6A EP11804698A EP2655995A1 EP 2655995 A1 EP2655995 A1 EP 2655995A1 EP 11804698 A EP11804698 A EP 11804698A EP 2655995 A1 EP2655995 A1 EP 2655995A1
Authority
EP
European Patent Office
Prior art keywords
flow path
recuperator
exhaust gas
furnace
heat exchanger
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
EP11804698.6A
Other languages
German (de)
English (en)
Other versions
EP2655995B1 (fr
Inventor
Ulrich Sommers
Markus Pieper
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.)
SMS Siemag AG
Original Assignee
SMS Siemag AG
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 SMS Siemag AG filed Critical SMS Siemag AG
Publication of EP2655995A1 publication Critical patent/EP2655995A1/fr
Application granted granted Critical
Publication of EP2655995B1 publication Critical patent/EP2655995B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F27D17/004—Systems for reclaiming waste heat
    • 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

Definitions

  • the invention relates to a method for operating a furnace in a plant for metal processing, in particular in a continuous casting in which exhaust gas from the furnace along a flow path is passed through at least one recuperator, wherein preheated in the recuperator by means of the heat energy contained in the exhaust gas fresh air for the furnace and the heated air is supplied to the furnace and wherein the exhaust gas is passed in the flow direction behind the recuperator in a chimney.
  • the invention relates to a plant for metal processing, in particular a continuous casting plant.
  • the generic method is used in particular in continuous casting, which can be designed as so-called. CSP plants (Compact Strip Production).
  • Such systems require at least one furnace, in which hot air is to be entered, which is heated by burners. Through the oven, the continuously cast slab is passed to be heated to a desired or required temperature.
  • recuperators In order to reduce the energy required for heating the furnace air, it is known to use recuperators, wherein in a preferred embodiment of the plant three recuperators per oven are used. In the recuperator energy recovery takes place from the hot exhaust gas of the furnace, d. H. In the recuperator heat is removed from the exhaust gas and used to preheat the furnace air.
  • the combustion air to be supplied to the furnace is heated in the recuperator from the hall temperature (about 30 ° C.) to about 450 ° C.
  • the exhaust gas is cooled from about 900 ° C to about 700 ° C.
  • Fig. 1 such a system is shown.
  • the furnace 1 of a continuous casting plant (CSP furnace) through which the continuously cast metal strand is passed for the purpose of heating, can be seen.
  • Hot exhaust gas A is discharged from the furnace and fed to a recuperator 2 via a flow path S.
  • the fresh air F enters the oven 1.
  • the fresh air F is heated in a known manner by means of a burner (not shown) to the required temperature.
  • a preheating of the fresh air F by a heat transfer between the exhaust A and the fresh air F takes place.
  • cooling air K (with ambient temperature), which is funded by a fan 1 1, cold air can be added to the exhaust gas A.
  • the control of this process by means of a switchable valve 12.
  • the said cooling takes place, if the exhaust gas A a certain temperature, for. B. 900 ° C exceeds. As a result, the temperature of the recuperator 2 reaching exhaust gas A is reduced and the recuperator 2 so protected or protected.
  • preheated combustion air can escape into the environment via a hot air outlet 13. This is done by way of a controlled valve 14.
  • a hot air outlet 13 By discharging combustion air via the hot air outlet 13, the pressure p in the flow path S "drops, but the pressure p is regulated to a desired value Level held, which is done by the control of the fan 10. If the pressure p thus decreases, more fresh air F is conveyed by the fan 10 and consequently more cold air is pumped into the recuperator 2. As a result, the temperature drops in the recuperator second
  • the invention is in the light of the task of proposing a method for operating a furnace in a plant for metal processing and such a system, with or with the improved energy efficiency can be achieved. So it should be achieved an improved use of energy.
  • the solution of this problem by the invention is according to the method characterized in that in the flow path for the exhaust gas from the furnace or a heat exchanger is arranged parallel to the flow path, supplied to the water and in which the water is heated, wherein the heated water or the steam generated is used to operate a plant for power generation or to be supplied to a consumer for hot water.
  • a first preferred embodiment of the invention provides that in the flow path of the exhaust gas, the recuperator and the heat exchanger are arranged in series, wherein the exhaust gas is first passed through the recuperator and then through the heat exchanger.
  • recuperator and the heat exchanger are arranged in series, but then the exhaust gas is first passed through the heat exchanger and then through the recuperator.
  • a further alternative embodiment of the proposed idea is based on the fact that the heat exchanger is arranged in a second flow path parallel to the flow path, wherein exhaust gas is at least temporarily passed through the flow path and through the second flow path simultaneously.
  • From the flow path of the preheated air for the furnace can also be controlled or regulated hot air to be discharged to the environment.
  • the air pressure in the flow path of the preheated air for the furnace can be controlled or maintained at a predetermined value, wherein for controlling or regulating the air pressure, the volume flow of fresh air is influenced, which is supplied to the recuperator.
  • the proposed plant for metal processing, in particular the continuous casting plant, according to the invention is characterized in that in the flow path or parallel to the flow path, a heat exchanger is arranged, wherein means for supplying water in an inlet of the heat exchanger are present, wherein a plant for power generation or means for Zu meeting of hot water to a consumer are present, which are connected to a drain of the heat exchanger.
  • the plant for power generation includes in particular a steam turbine.
  • a second flow path is arranged parallel to the flow path, wherein the heat exchanger is arranged in the second flow path and wherein at a branch point in which the second flow path branches off from the flow path, a controllable valve is arranged, which is formed, the exhaust gas with a predetermined amount in the two flow paths to guide.
  • the exhaust gas is thus divided by the controllable valve in two flow paths.
  • the waste heat of the kiln exhaust gas can be converted directly into electricity but also provided to the hot water supply of a consumer.
  • the invention makes it possible to lower the temperature of the combustion air advantageously by passing hot exhaust gases through an additional valve through a second recuperator. As a result, components can be protected and the energy of the hot exhaust gases can still be used. In addition, this can preferably be dispensed with the reduction of the combustion air temperature. The system thus runs more stable overall.
  • embodiments of the invention are shown.
  • Fig. 1 shows schematically a plant scheme for the operation of a furnace
  • Fig. 2 shows schematically a system diagram for the furnace, after a first
  • Embodiment of the invention works,
  • Fig. 3 shows schematically a plant scheme for the furnace, which operates according to a second embodiment of the invention.
  • Fig. 4 shows schematically a system diagram for the furnace, which after a third
  • Embodiment of the invention operates.
  • FIGS. 2 to 4 show three different detailed concepts of how an oven 1 of a continuous casting plant can be operated in order to achieve an improved energy balance. They all based on the idea that in addition to at least one recuperator 2, a heat exchanger 4 is available, can be used with the residual heat from the exhaust gas A of the furnace 1 to produce either in a plant 5 for electricity generation electricity (is in the figures shown) or to use the residual heat to provide hot water to a consumer available (is not shown).
  • recuperator 2 fresh air F is supplied, along a flow path S "through the recuperator 2 and further into the furnace. 1 is directed.
  • a heat transfer from the exhaust gas A to the fresh air F takes place, so that the fresh furnace air (combustion air) is preheated.
  • recuperators used reference is made to the state of the art. They each have a separate room for the two media between which heat is to be exchanged. Plate heat exchangers, in particular spiral heat exchangers, can be used.
  • Pipe heat exchanger, jacket tube heat exchanger or countercurrent layer heat exchanger Pipe heat exchanger, jacket tube heat exchanger or countercurrent layer heat exchanger.
  • a heat exchanger 4 is connected in series with the recuperator 2, d. H. the heat exchanger 4 is arranged in the flow path S, which leads from the furnace 1 to the chimney 3.
  • the exhaust gas A is passed through the recuperator 2 and then the already cooled to about 700 ° C exhaust gas A through the heat exchanger 4.
  • the heat exchanger 4 is supplied with water W via an inlet 6.
  • the water W is heated and is converted into steam, which is supplied via a drain 7 of a plant 5 for power generation, comprising a steam turbine.
  • the conversion of the energy in the steam into electricity is well known as such and need not be further deepened here.
  • temperature control of the exhaust gas A behind the furnace 1 can also take place here - as in the prior art - by admixing cooling air K via a ventilator 11 and a switchable valve 12. It can also be provided that a hot air outlet 13 is opened via a switchable valve 14 in order to discharge heated fresh air and for the purpose of maintaining it of the pressure p to actuate the fan 10 accordingly, so that more cold fresh air F is conveyed into the flow path S ".
  • the solution according to FIG. 3 is very similar to that according to FIG. 2.
  • the difference here is that the heat exchanger 4 is arranged here for the heating of the water W here first after the furnace 1; the recuperator 2 follows only behind the heat exchanger 4, as seen in the flow direction in the flow path S. Via a valve 15 hot exhaust gas can be routed to the recuperator 2 around the heat exchanger 4, if required.
  • the solution shown is also characterized by the fact that it is possible to first cool the exhaust gas A by heating water and converting it to steam and only then to supply the recuperator 2. Therefore, the preferred case is sketched in Fig.
  • the second flow path S ' is thus arranged parallel to the flow path S, in which the heat exchanger 4 is placed.
  • the second flow path S ' branches off.
  • a controllable valve 9 is arranged. With the valve 9 can be specified to what extent exhaust gas is passed to the heat exchanger 4. Is the valve 9 closed, ie exhaust gas A is passed only through the flow path S, is exactly the situation before, as it corresponds to the prior art.
  • the supply of exhaust gas A to the heat exchanger 4 can thus be prevented via the valve 9, 15 and all exhaust gas A can be guided via the recuperator 2.
  • the combustion air can be reduced by passing the hot exhaust gas through the second recuperator by means of the valve 15. This protects the components and still allows the energy to be used. In addition, the indirect control to lower the combustion temperature by means of the hot air outlet is avoided, making the system more stable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Air Supply (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

L'invention concerne un procédé pour faire fonctionner un four (1) dans une installation de travail des métaux, notamment dans une installation de coulée continue. Dans ce procédé, le gaz d'échappement (A) est guidé hors du four (1) le long d'une voie d'écoulement (S) à travers au moins un récupérateur (2), de l'air frais (F) pour le four (1) étant préchauffé dans le récupérateur (2) au moyen de l'énergie thermique contenue dans le gaz d'échappement (A) et l'air chauffé étant acheminé au four (1). Le gaz d'échappement (A) est guidé dans la direction d'écoulement derrière le récupérateur (2) dans une cheminée (3). Afin d'obtenir une meilleure utilisation de l'énergie, on dispose selon l'invention un échangeur de chaleur (4) dans le chemin d'écoulement (S) ou parallèlement au chemin d'écoulement (S), auquel de l'eau (W) est acheminée et dans lequel l'eau est chauffée. L'eau chauffée ou la vapeur produite est utilisée pour faire fonctionner une installation de génération de courant (5) ou pour alimenter un consommateur d'eau chaude. En outre, l'invention concerne une installation de travail des métaux, notamment une installation de coulée continue.
EP11804698.6A 2010-12-22 2011-12-22 Procédé pour faire fonctionner un four dans une installation de travail des métaux Not-in-force EP2655995B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010063839 DE102010063839A1 (de) 2010-12-22 2010-12-22 Verfahren zum Betreiben eines Ofens in einer Anlage zur Metallverarbeitung und Anlage zur Metallverarbeitung
PCT/EP2011/073894 WO2012085258A1 (fr) 2010-12-22 2011-12-22 Procédé pour faire fonctionner un four dans une installation de travail des métaux et installation de travail des métaux

Publications (2)

Publication Number Publication Date
EP2655995A1 true EP2655995A1 (fr) 2013-10-30
EP2655995B1 EP2655995B1 (fr) 2014-05-28

Family

ID=45444609

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11804698.6A Not-in-force EP2655995B1 (fr) 2010-12-22 2011-12-22 Procédé pour faire fonctionner un four dans une installation de travail des métaux

Country Status (3)

Country Link
EP (1) EP2655995B1 (fr)
DE (1) DE102010063839A1 (fr)
WO (1) WO2012085258A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102901367A (zh) * 2012-11-16 2013-01-30 重庆赛迪工业炉有限公司 一种转底炉预热器系统
CN104697348B (zh) * 2015-03-27 2016-09-07 沈阳鑫博工业技术股份有限公司 焙烧炉烟气余热回收装置及方法
DE102016112103B4 (de) 2016-07-01 2019-08-22 Thomas Kirchhöfer Hochtemperaturofen mit Wärmerückgewinnung

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US2192108A (en) 1935-08-28 1940-02-27 Rekuperator Gmbh Steel smelting furnace
DE1162391B (de) 1958-12-17 1964-02-06 Schmidt Sche Heissdampf Verfahren zur Ausnutzung der Abwaerme von Stoss- oder Waermoefen, Siemens-Martin-OEfen od. dgl.
GB974863A (en) * 1959-12-01 1964-11-11 Waagner Biro Ag Improvements relating to industrial furnaces
US3039005A (en) 1960-04-08 1962-06-12 Ibm Electro-optical device
US4340207A (en) 1977-02-14 1982-07-20 Dravo Corporation Waste heat recovery apparatus
DE3142860A1 (de) 1981-10-29 1983-05-11 Italimpianti (Deutschland) Industrieanlagen GmbH, 4000 Düsseldorf "verfahren und vorrichtung zum vorwaermen"
US4528012A (en) 1984-01-30 1985-07-09 Owens-Illinois, Inc. Cogeneration from glass furnace waste heat recovery
US5235414A (en) 1990-05-21 1993-08-10 Control Data Corporation Non-obtrusive programming monitor
IT1287570B1 (it) 1996-10-11 1998-08-06 Demag Italimpianti Spa Forno per processi e trattamenti in atmosfera sottostechiometrica
ZA200304880B (en) 2003-02-24 2004-05-04 Air Liquide Integrated heat recovery systems and methods for increasing the efficiency of an oxygen-fired furnace.
US20090035712A1 (en) 2007-08-01 2009-02-05 Debski Paul D Reheat Furnace System with Reduced Nitrogen Oxides Emissions

Non-Patent Citations (1)

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Title
See references of WO2012085258A1 *

Also Published As

Publication number Publication date
EP2655995B1 (fr) 2014-05-28
WO2012085258A1 (fr) 2012-06-28
DE102010063839A1 (de) 2012-06-28

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