WO1983001631A1 - Recuperation de chaleur dans des installations de fusion d'aluminium - Google Patents

Recuperation de chaleur dans des installations de fusion d'aluminium Download PDF

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Publication number
WO1983001631A1
WO1983001631A1 PCT/SE1982/000367 SE8200367W WO8301631A1 WO 1983001631 A1 WO1983001631 A1 WO 1983001631A1 SE 8200367 W SE8200367 W SE 8200367W WO 8301631 A1 WO8301631 A1 WO 8301631A1
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
alumina
bed
furnace gases
gases
Prior art date
Application number
PCT/SE1982/000367
Other languages
English (en)
Inventor
Radgivande Ingenjörer Ab Hb-Consult
Original Assignee
Frilund, Eyvind
Holmberg, Per
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 Frilund, Eyvind, Holmberg, Per filed Critical Frilund, Eyvind
Priority to JP57503310A priority Critical patent/JPS58501951A/ja
Priority to BR8208071A priority patent/BR8208071A/pt
Publication of WO1983001631A1 publication Critical patent/WO1983001631A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/22—Collecting emitted gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • The. present invention relates to a method of heat recovery from a furnace for manufacturing aluminium by melting electrolysis of alumina, the furnace gases being passed through a bed of alumina while the bed is being fluidized.
  • the melting electrolysis takes place in furnaces which have been developed specificall for that purpose and are formed as troughs which usually consist of . steel and have a brick ' lining, Normally, the cathode is located in the ' bottom of the furnace and is made of carbon while the anode can be e.g, of. prebaked type or S ⁇ derberg type and usually is fed from above to the electrolysis bath. It is consumed during the process and must be replaced continuously.
  • the alumina and certain solid additives are supplied to the electrolyte through or laterally of the anode, and th.e produced aluminium is drawn off batchwise. hy siphon or by suction.
  • the gas produced in the electrolysis, the furnace gas consists of carbon monoxide, carbon dioxide, and a mixture of hydrocarbons and f1 uorhydrocarbons , etc. , and normally is evacuated mixed with ventilation air either directly to the surrounding air in the space where the furnace is located, or to some collection means, e.g. metal sheet hoods, for the recovery of solid particles cons st ng of fluor salts which are entrained in the furnace gases.
  • the escaping furnace., gases represent a substantial amount of energy which in a plant for production of 80,000 tons raw aluminium per year is of the order of 20 MW,
  • OMPI furnace gases are at the same time separated and recovered, it has been proposed to pass the furnace gases, when they have passed through the bed of alumina, through a heat exchanger for heat exchange between the furnace gases and an external fluid (U.S. patent specification 3,664,935], In that case the heat exchanger is rapidly clogged, However, due to deposition of dust from th e furnace gas, such, t ⁇ at it is necessary to clean frequently the heat exchanger.
  • the cathode is cooled by free convection. In- that case it is necessary in the winter time when the ai -is cool, to compensate for the more considerable heat loss by increased supply of electric energy for the electrolysis. Due to the fact that the cooling of the cathode is obtained by means of the furnace gases there s obtained a controlled heat transport from the cathode, the energy consumption for the electrolysis thus being reduced .
  • a furnace 10 for melting electrolysis of alumina comprising anodes 11 and a cathode 12.
  • An inlet 13 for the supply of alumina to the furnace is arranged at the top.
  • the furnace space is closed and is connected through a conduit 14 with a cooling jacket 15 arranged around the cathode 12, which is connected also to a pump 17 through a conduit 16.
  • the furnace 10 and the jacket- 15 preferably ' are heat insulated against the surroundings.
  • the furnace gases are drawn from the furnace through the conduit 14 and are allowed to pass through the jacket 15 for heat exchange with the cathode 12 which is cooled as a consequence thereof.
  • the furnace gases now further heated are supplied by means of the pump 17 through a conduit but can also be returned to the jacket 15 through the conduit 18 by means of the pump 19.
  • it is possihle to control the cooling effect and thus the temperature of the cathode 12.
  • compensation is automatically obtained by reduced- cool - ing of the cathode, because the furnace gases operating as a cooling fluid then have a higher temperature; It is achieved thereby that the consumption of electric energy for the melt electrolysis is -maintained at a fairly constant level at a given production level.
  • the condui 20 is connected to a container 21 in whi ch a perforated bottom 22 is arranged at some distance from the lower end of the container to support a bed 23.of alumina. This can be filled into the con ⁇ tainer through an inlet opening 24.
  • a heat coil 25 " for circulation of an external fluid is arranged inside the container, and at the top the container is connected to an outlet conduit 26 which extends to a dust separator 27 which can be of the cyclone type and has an outlet 28 for separated solid Q particles at the bottom thereof.
  • a cleaner 29 is arranged below the perforated bottom 22 and is connected to an electric drive motor 30.
  • the furnace gases escape through the conduit 26 a portion of the a u ina and adhering fluor salts accompany the furnace gases but will be separated in the dust separator 27 before the furnace gases deprived of the major part of 5 the heat content thereof and relieved from entrained dust, are discharged to the atmosphere.
  • the material separated in the dust separator 27, which consists of alumina, enriched with fluor salts, can be supplied to the furnace through the inlet 13 or it can also be .- 0 returned to the container 20 through the inlet opening 24.
  • the heat removed from the furnace gases by means of the external fluid circulating through the heat coil 25 can be utilized in different manners e.g, in a net- 5 work for remote heating to which the heat is transferred
  • OMPI Uf. either via heat exchangers or via heat pumps, for desalination of sea water or other water containing salt for the production of fresh water to be used industrially e.g. for the production of electric energy 5 . either by means of conventional water steam cycles or in two-media cycles, e,g. by using freon, or for production of heat and/or cold in absorption heat pumps. A combination of two or'more ' of these utilization - methods can also be adhered to. Since the heat exchange 10 between the furnace gases and the external fluid circulating in the heat coil 25 takes place in a fluidized bed of alumina, clogging of- the heat exchanger is avoided and a several times improved heat transfer is obtained. Due to this fact a less extensive 15 apparatus will be necessary for treating the furnace gases, since the recovery of heat and the rec ove ry of fluor salts can take place in one and the same apparatus of a compact construction.
  • the method of the invention provides a substantial simplification of the 25 heat recovery from the cathode, because an existing gas collection system and a common heat exchanger for the furnace gases and the cathode cooling can be used.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Cookers (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Procédé de récupération dans un four de production d'aluminium par électrolyse d'alumine en fusion. Les gaz du four traversent un lit (23) d'alumine tandis que le lit est fluidifié autour d'un tube en serpentin (25). Un échange thermique a ainsi lieu entre les gaz du four et un fluide extérieur traversant le tube en serpentin, ce qui permet de récupérer l'énergie thermique présente dans les gaz du four.
PCT/SE1982/000367 1981-11-04 1982-11-04 Recuperation de chaleur dans des installations de fusion d'aluminium WO1983001631A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP57503310A JPS58501951A (ja) 1981-11-04 1982-11-04 アルミニウム溶融工場における熱回収
BR8208071A BR8208071A (pt) 1981-11-04 1982-11-04 Processo para recuperacao de calor em forno para fabricacao de aluminio for fusao de alumina por eletrolise

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8106508 1981-11-04
SE8106508-8811104 1981-11-04

Publications (1)

Publication Number Publication Date
WO1983001631A1 true WO1983001631A1 (fr) 1983-05-11

Family

ID=20344953

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1982/000367 WO1983001631A1 (fr) 1981-11-04 1982-11-04 Recuperation de chaleur dans des installations de fusion d'aluminium

Country Status (6)

Country Link
EP (1) EP0107662A1 (fr)
JP (1) JPS58501951A (fr)
AU (1) AU9058282A (fr)
BR (1) BR8208071A (fr)
NO (1) NO832433L (fr)
WO (1) WO1983001631A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010142893A1 (fr) * 2009-06-10 2010-12-16 Solios Environnement Système et procédé de récupération d'énergie
WO2012136796A2 (fr) 2011-04-08 2012-10-11 Bhp Billiton Aluminium Technologies Limited Eléments d'échange de chaleur destinés à être utilisés dans des cuves de traitement pyrométallurgique
CN113390267A (zh) * 2021-04-29 2021-09-14 广元市林丰铝电有限公司 铝电解槽烟气余热回收方法及系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1196487B (it) * 1986-07-15 1988-11-16 Techmo Car Spa Procedimento per depurare i gas emessi dai forni di elettrolisi per la produzione di alluminio e relativa apparecchiatura
EP2431498B1 (fr) * 2010-09-17 2016-12-28 General Electric Technology GmbH Échangeur thermique de cuve d'électrolyse pour la réduction d'aluminium

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE216123C1 (fr) * 1957-12-19 1967-10-17
US3664935A (en) * 1971-01-21 1972-05-23 Arthur F Johnson Effluent filtering process and apparatus for aluminum reduction cell
SE362901B (fr) * 1971-10-27 1973-12-27 Svenska Flaektfabriken Ab
US3823079A (en) * 1972-12-14 1974-07-09 Reynolds Int Inc Aluminum reduction cell operating system
GB1395900A (en) * 1971-10-14 1975-05-29 Technical Dev Capital Ltd Fluidized bed heat exchangers
DE2505535A1 (de) * 1975-02-10 1976-08-19 Inst Gas Technology Verfahren fuer den hochtemperaturaustausch thermischer energie in stroemenden gasen
GB1474215A (en) * 1973-09-15 1977-05-18 Vaw Ver Aluminium Werke Ag Process for removing hydrogen fluoride from gases containing it
GB1486871A (en) * 1974-01-24 1977-09-28 Vaw Ver Aluminium Werke Ag Process for removing hydrogen fluoride from gases containing it
WO1980002193A1 (fr) * 1979-04-09 1980-10-16 Norsk Viftefab As Echangeur de chaleur pour gaz
US4274478A (en) * 1978-02-23 1981-06-23 Stal-Laval Apparat Ab Apparatus for cooling dust-containing gas
GB2077615A (en) * 1980-06-07 1981-12-23 Worsley G P & Co Ltd Fluidised bed heat exchangers

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE216123C1 (fr) * 1957-12-19 1967-10-17
US3664935A (en) * 1971-01-21 1972-05-23 Arthur F Johnson Effluent filtering process and apparatus for aluminum reduction cell
GB1395900A (en) * 1971-10-14 1975-05-29 Technical Dev Capital Ltd Fluidized bed heat exchangers
SE362901B (fr) * 1971-10-27 1973-12-27 Svenska Flaektfabriken Ab
US3823079A (en) * 1972-12-14 1974-07-09 Reynolds Int Inc Aluminum reduction cell operating system
GB1474215A (en) * 1973-09-15 1977-05-18 Vaw Ver Aluminium Werke Ag Process for removing hydrogen fluoride from gases containing it
GB1486871A (en) * 1974-01-24 1977-09-28 Vaw Ver Aluminium Werke Ag Process for removing hydrogen fluoride from gases containing it
DE2505535A1 (de) * 1975-02-10 1976-08-19 Inst Gas Technology Verfahren fuer den hochtemperaturaustausch thermischer energie in stroemenden gasen
US4274478A (en) * 1978-02-23 1981-06-23 Stal-Laval Apparat Ab Apparatus for cooling dust-containing gas
WO1980002193A1 (fr) * 1979-04-09 1980-10-16 Norsk Viftefab As Echangeur de chaleur pour gaz
GB2077615A (en) * 1980-06-07 1981-12-23 Worsley G P & Co Ltd Fluidised bed heat exchangers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010142893A1 (fr) * 2009-06-10 2010-12-16 Solios Environnement Système et procédé de récupération d'énergie
FR2946666A1 (fr) * 2009-06-10 2010-12-17 Solios Environnement Systeme et procede de recuperation d'energie
WO2012136796A2 (fr) 2011-04-08 2012-10-11 Bhp Billiton Aluminium Technologies Limited Eléments d'échange de chaleur destinés à être utilisés dans des cuves de traitement pyrométallurgique
CN113390267A (zh) * 2021-04-29 2021-09-14 广元市林丰铝电有限公司 铝电解槽烟气余热回收方法及系统

Also Published As

Publication number Publication date
BR8208071A (pt) 1984-03-07
EP0107662A1 (fr) 1984-05-09
AU9058282A (en) 1983-05-18
NO832433L (no) 1983-07-04
JPS58501951A (ja) 1983-11-17

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