WO2009046757A1 - Procédé et appareil d'exploitation de la chaleur résiduelle d'un four annulaire à anodes - Google Patents

Procédé et appareil d'exploitation de la chaleur résiduelle d'un four annulaire à anodes Download PDF

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Publication number
WO2009046757A1
WO2009046757A1 PCT/EP2007/060661 EP2007060661W WO2009046757A1 WO 2009046757 A1 WO2009046757 A1 WO 2009046757A1 EP 2007060661 W EP2007060661 W EP 2007060661W WO 2009046757 A1 WO2009046757 A1 WO 2009046757A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
flue gas
heat transfer
zone
heat
Prior art date
Application number
PCT/EP2007/060661
Other languages
German (de)
English (en)
Other versions
WO2009046757A9 (fr
Inventor
Wolfgang Leisenberg
Original Assignee
Innovatherm Prof. Dr. Leisenberg Gmbh + Co. Kg
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 Innovatherm Prof. Dr. Leisenberg Gmbh + Co. Kg filed Critical Innovatherm Prof. Dr. Leisenberg Gmbh + Co. Kg
Priority to PCT/EP2007/060661 priority Critical patent/WO2009046757A1/fr
Publication of WO2009046757A1 publication Critical patent/WO2009046757A1/fr
Publication of WO2009046757A9 publication Critical patent/WO2009046757A9/fr

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
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge
    • F27B13/06—Details, accessories, or equipment peculiar to furnaces of this type
    • 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

Definitions

  • the present invention relates to a method for utilizing the waste heat produced during operation of an anode ring furnace comprising at least one heating zone, a fire zone and a cooling zone, in which a hot gas flow discharged from the anode ring furnace is used to control the temperature of a water flow supplied to a thermal power plant. Moreover, the invention relates to a device for carrying out the aforementioned method.
  • the present process finds application in the production of anodes needed for fused-salt electrolysis to produce primary aluminum.
  • These anodes are prepared from petroleum coke with the addition of pitch as a binder in a molding process as so-called “green anodes” or "raw aodes” which are subsequently sintered in an anode ring furnace following the molding process.
  • This sintering process takes place in a defined heat treatment process in which the anodes pass through three phases, namely a heating phase, a sintering phase and a cooling phase.
  • Rohanoden in the heating zone of the Aufliestzone, the fire zone and the cooling zone, circumferentially formed on the anode ring furnace "fire" and are preheated by the originating from the cooling zone waste heat of already finished sintered anodes before the preheated anodes in the firing zone or to the sintering temperature of about 1050 0 C to be heated.
  • the various zones mentioned above are defined by an alternating circumferential arrangement of different units above furnace chambers, which receive the anodes and act as heat exchangers.
  • the burner means By positioning the burner means above the selected furnace chambers, the burner or fire zone is defined which is located between the heating zone and the cooling zone. In the cooling zone are immediately before fired, ie heated to sintering temperature, finished anodes.
  • a blower device is arranged, is input by means of the air into the chambers of the cooling zone, which by a above the heating zone arranged suction through the chambers interconnecting heating channels from the cooling zone through the fire zone into the heating zone and from this as a flue gas through a Flue gas cleaning system is passed and discharged into the environment.
  • EP 1 785 685 A1 It is proposed in EP 1 785 685 A1 to supply the flue gas flow taken by means of a suction device of the heating zone, which still has a temperature between 150 ° C. and 250 ° C., to a heat exchanger which is heated before forming the "green anodes". and Formaggregat a heating of the petroleum coke to about 150 0 C to allow to ensure an improvement of wettability with liquid pitch in the subsequent mixing process
  • the object of the present invention is therefore to propose a method or a device which enables a considerable reduction of the energy provisioning and the associated cost outlay.
  • the hot gas flow discharged from the anode ring furnace is used for the temperature control of a water flow supplied to a thermal power plant.
  • the invention is based on the finding that the boiler feed water, which is required for operating a thermal power plant, has a low starting temperature and thus represents a virtually unlimited heat sink in relation to the usable waste heat of the anode ring furnace.
  • An approximate calculation shows that when passing the entire boiler water quantity using all waste heat potentials, ie all free energy, the water is heated by only about 2 0 C.
  • the waste heat of the anode ring furnace which is not required for crude anode production, is used to heat the boiler water.
  • a flue gas flow discharged from the fire zone or the heating zone is used for controlling the temperature of the water flow.
  • the flue gas flow leaves the oven with 250 0 C to 350 0 C and must be cooled down to about 1 10 0 C for conditioning a flue gas cleaning system with demineralized water. This is a complex and costly process, especially in hot countries, such as the Gulf States, since seawater often has to be previously desalinated for further use with a large amount of energy.
  • the flue gas flow is passed through a heat exchanger device upstream of a flue gas cleaning device.
  • the flue gas flow still has a temperature of about 100 0 C and thus a usable heat potential, it is advantageous to direct the flue gas flow through a downstream of the flue gas cleaning device heat exchanger device to use even this heat potential ,
  • the heat exchanger device allows heat transfer from the flue gas flow to a heat transfer medium in a first heat transfer phase and heat transfer from the heat transfer medium to the water flow takes place only in a second heat transfer phase, it can be ensured that the high flow temperature difference between the flue gas flow and the water Dew point temperature of acidic flue gas components, which can lead to corrosion in the heat exchanger device is prevented.
  • These constituents are usually sulfur and fluorine, with the dew point in the raw gas, ie before entering the flue gas cleaning device at about 120 0 C and the clean gas, ie after exiting the flue gas cleaning device, at about 50 0 C.
  • an intermediate circuit is defined, so that heat exchanger surfaces can be kept within the heat exchanger device above the dew point temperature of the flue gas components and only in a second heat transfer phase, the heat is transferred to the boiler water.
  • the method takes place in the second heat transfer phase, the heat transfer only to a variable subset of water flow, so that it is not necessary in any case to direct the entire amount of boiler water through the heat exchanger, but only a sufficient temperature increase necessary for the boiler water subset ,
  • the subset of the water flow is adjusted so that the temperature at heat transfer surfaces of the heat exchanger device is above the dew point temperatures of acidic flue gas components in order to prevent the formation of corrosion as far as possible.
  • the waste heat from the cooling zone can be used directly to control the temperature of the boiler water, since the hot gas flow originating from the cooling zone is essentially free from contamination in contrast to the flue gas flow.
  • the device according to the invention has the features of claim 10 and enables the implementation of the method according to the invention with the resulting advantages.
  • a furnace unit of an anode ring furnace 10 which has a heating zone 1 1, a fire zone 12 and a cooling zone 13.
  • burner devices so-called “Rohanoden” are heated to about 1050 0 C and for the production of usable for the fused salt electrolysis anodes sintered.
  • the right of the fire zone 12 is the cooling zone 13, in which Surrounding or fresh air 14 is introduced into the cooling zone and partially led out of the cooling zone 13 by a suction device not shown here as heated by the waste heat of the anodes hot gas flow 15
  • the remaining ambient or fresh air 14 introduced into the cooling zone 13 is introduced through the fire zone 12 into the heating zone 11, in which rawodes are present for preheating, and discharged as flue gas flow 16 out of the heating zone.
  • the flue gas flow 16 is passed through a flue gas cleaning device 17 and finally discharged into the environment. Between the anode ring furnace 10 and the flue gas cleaning device 17, the flue gas flow 16 is passed through a first heat exchanger device 18, which comprises a first heat exchanger unit 19 and a second heat exchanger unit 20.
  • the heat exchanger units 19 and 20 are connected via a thermal oil circuit 21, so that in the first heat exchanger unit 19, a heat transfer from the flue gas flow 16 on a circulating in the thermal oil circuit 21 as a heat transfer medium thermal oil 22 and in the second heat exchanger unit 20, a heat transfer from the thermal oil 22 takes place on a guided through the second heat exchanger unit 21 boiler water flow 23.
  • the heat exchanger device 24 also has a first heat exchanger unit 25 and a second heat exchanger unit 26 which are connected via a thermal oil circuit 21 with each other and thus with the interposition of the thermal oil circuit 21st allow a heat transfer from the flue gas flow 16 to the boiler water flow 23.
  • the heat exchanger units 20 and 26 are each provided with a bypass device 27.
  • bypass devices 27 By means of the bypass devices 27, a regulated division of the boiler water flow 23 into a main flow 28 and a secondary flow 29 is made possible in such a way that the heat transfer surfaces of the heat exchanger units, which are regularly made of metal, can be kept at a temperature above the dew point temperatures of the acid constituents contained in the flue gas lieth.
  • hot gas flow 15 is located downstream of a heat exchanger device 30, which is used for temperature control of a thermal oil flow 31, which is used for the operation of a device not shown here for the production of raw anode, another heat exchanger device 32.
  • a heat exchanger device 32 Via the heat exchanger device 32 takes place in the illustrated embodiment, without the interposition of a circulating heat transfer medium an immediate heat transfer to the boiler water flow 23rd

Landscapes

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

Abstract

La présente invention concerne un procédé d'exploitation de la chaleur résiduelle produite pendant le fonctionnement d'un four annulaire à anodes (10) comportant au moins une zone de chauffe (11), une zone de foyer (12) et une zone de refroidissement (13). Le procédé consiste à utiliser un courant de gaz brûlant évacué du four annulaire à anodes pour thermoréguler un courant d'eau (23) acheminé vers une centrale thermique.
PCT/EP2007/060661 2007-10-08 2007-10-08 Procédé et appareil d'exploitation de la chaleur résiduelle d'un four annulaire à anodes WO2009046757A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/060661 WO2009046757A1 (fr) 2007-10-08 2007-10-08 Procédé et appareil d'exploitation de la chaleur résiduelle d'un four annulaire à anodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/060661 WO2009046757A1 (fr) 2007-10-08 2007-10-08 Procédé et appareil d'exploitation de la chaleur résiduelle d'un four annulaire à anodes

Publications (2)

Publication Number Publication Date
WO2009046757A1 true WO2009046757A1 (fr) 2009-04-16
WO2009046757A9 WO2009046757A9 (fr) 2010-07-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/060661 WO2009046757A1 (fr) 2007-10-08 2007-10-08 Procédé et appareil d'exploitation de la chaleur résiduelle d'un four annulaire à anodes

Country Status (1)

Country Link
WO (1) WO2009046757A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104748570A (zh) * 2015-04-10 2015-07-01 中国瑞林工程技术有限公司 一种利用空气冷却器热风的方法
CN106440832A (zh) * 2016-08-30 2017-02-22 上海富驰高科技有限公司 余热回收装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH689830A5 (de) * 1998-09-02 1999-12-15 Zappa Luzius Integriertes Verfahren der simultanen Erzeugung von Zement-Klinker und Elektrizitaet.
WO2000064832A1 (fr) * 1999-03-19 2000-11-02 Vinod Chintamani Malshe Installation et procede pour la production simultanee de ciment et d'electricite
EP1785685A1 (fr) * 2005-11-10 2007-05-16 Innovatherm Prof. Dr. Leisenberg GmbH & Co. KG Dispositif et procédé pour chauffer des matériau de départ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH689830A5 (de) * 1998-09-02 1999-12-15 Zappa Luzius Integriertes Verfahren der simultanen Erzeugung von Zement-Klinker und Elektrizitaet.
WO2000064832A1 (fr) * 1999-03-19 2000-11-02 Vinod Chintamani Malshe Installation et procede pour la production simultanee de ciment et d'electricite
EP1785685A1 (fr) * 2005-11-10 2007-05-16 Innovatherm Prof. Dr. Leisenberg GmbH & Co. KG Dispositif et procédé pour chauffer des matériau de départ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104748570A (zh) * 2015-04-10 2015-07-01 中国瑞林工程技术有限公司 一种利用空气冷却器热风的方法
CN106440832A (zh) * 2016-08-30 2017-02-22 上海富驰高科技有限公司 余热回收装置
CN106440832B (zh) * 2016-08-30 2019-02-05 上海富驰高科技有限公司 余热回收装置

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Publication number Publication date
WO2009046757A9 (fr) 2010-07-08

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