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
  • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
• • 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
  • C25C3/20—Automatic control or regulation of cells
• • 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
  • F27D1/00—Casings; Linings; Walls; Roofs
  • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
• • 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
  • F27D9/00—Cooling of furnaces or of charges therein
• • 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 invention regards heat regulation in general and particularly method and system for use for control of layer formation in an aluminium electrolysis cell and exploitation of heat.
• the operations of the cells depend on the formation and maintenance of a protective layer of frozen electrolyte in the side walls of the cell.
• This 5 frozen bath is called side layer and protects the side lining of the cells against chemical and mechanical wear, and is an essential condition for achieving long lifetime of the cells.
• the crystallized bath operates simultaneously as a buffer for the cell with regards of changes in the heat balance.
• the heat generation and the heat balance of the cell will vary due to unwanted disturbances of the operation (changes in bath acidity, changes in alumina concentration, changes in interpolar distances, etc.) and desired activities on the cells (metal tapping, change of anode, fire, etc.).
• GB 2076428A describing an aluminium cell with isolating layers in bottom and walls.
• the walls In the walls there are carbon blocks with heat tubes moulded in for the removal of heat from the cell.
• the heat tubes can be adjusted with different distances in order to vary the degree of heat removal.
• the object of the invention is to provide a method and system for use for control of layer formation in an aluminium electrolysis cell and exploitation of the heat.
• a sidelining provided with heat tube for transport of heat is provided.
• the present invention relates to structural elements for forming a sidelining material for cooling of sidelining in aluminium electrolysis cells for the purpose of controlling and adjusting sidelining thickness in the cell.
• the sidelining materials it is also possible to provide heat exchange of such cells with possibility of regeneration of heat as electrical energy and/or heat.
• By the forming of sidelining materials in the present invention one should understand design, formation and production of hollows in the material for the purpose of mounting of heat tubes such as heat pipes to lead heat to the outside of the aluminium electrolysis bath.
• the evaporation end of the heat tube is mounted on the inside of the electrolysis bath and is in contact with the above mentioned sidelining material while on the heat tube condensation end a cooling element is mounted transferring the transported heat to a suited cooling medium such as for instance oil.
• the present invention achieves the objectives outlined above by a sidelining as described in claim 1 and a method as described in claim 4.
• the sidelining material is manufactured without requirements for inserting thin canals. Instead a plurality of heat tubes are utilized, attached to the sidelining.
• the technical effect of the difference is that one achieves efficient transfer of heat without having to sinter sidelinings with thin canals along with the problems that this incurs.
• heat tubes can be more efficient in transferring heat than use of cooling medium in the canals.
• a further technical effect is that the heat tubes will be more stably fastened to the longitudinal canals in the surface of the sidelining and that there will be a low thermal gradient along the canal compared to canals known from the state of the art.
• Figure 1 shows a typical embodiment of the invention in the form of a sidelining block with hollows and heat tube for an electrolysis cell
• Figure 2 shows a detail section of the embodiment of figure 1 together with section as seen from the side
• Figure 3 shows an example of providing heat tubes in the sidelining block
• Figure 4 shows another example of providing heat tubes in the sidelining block.
• sidelining block 1 1 together with the heat isolation 10, wherein the sidelining block is provided with heat tube 12.
• the sidelining block 1 1 is typically made from SiC 1 1a, l ib as in example a and b.
• figure 1 schematically shows a typical embodiment of the invention in the form of a sidelining block with hollows and heat tubes for an electrolysis cell.
• the sidelining block is manufactured from a ceramic material. It is manufactured in a particular way to achieve the intended hollows.
• Figure 1 shows one example of possible positioning of hollows.
• Figure 2 shows the detail section also from the side where the heat tubes are positioned standing along the canals in the surface of the sidelining block.
• Heat tubes are positioned against these hollows and an example of such a heat tube in the form of a heat pipe.
• a cooling element On the cold end of the heat tube, also known as the condensation side, a cooling element is mounted comprising a condensation unit for heat tube 13 and condensation fins 14.
• the invention achieves its solution by the assembly of plurality of principles.
• heat tube where the phase transition liquid to vapour in the hot end transports large amounts of heat to the cold end where the vapour condenses to liquid which then is returned to the hot end.
• heat tube there are two embodiments intended: “heat pipe” where a wick or other capillary effect pulls the liquid back to the hot end, and “thermosyphon” where the gravity pulls the liquid back to the hot end.
• An aluminium electrolysis cell will comprise several tens of such "heat pipe” heat exchangers in the sidewalls. The heat removed from the cells will be transported in a cooling medium. This heat can for instance be exploited to produce electrical energy. A plurality of electrolysis cells can also be connected together in order to regenerate the cooled effect in an efficient manner.
• the invention is applicable for control of layer formation in a aluminium electrolysis cell and exploitation of the heat.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Electrolytic Production Of Metals (AREA)
• Coating By Spraying Or Casting (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

Family

ID=45874019

Family Applications (1)

Country Status (11)

Cited By (5)

Families Citing this family (2)

Citations (5)

Family Cites Families (15)

• 2011
  • 2011-09-19 AR ARP110103417A patent/AR083049A1/es unknown
  • 2011-09-20 US US13/825,752 patent/US20130199938A1/en not_active Abandoned
  • 2011-09-20 EP EP11827027.1A patent/EP2619518A4/en not_active Withdrawn
  • 2011-09-20 AU AU2011306524A patent/AU2011306524A1/en not_active Abandoned
  • 2011-09-20 AP AP2013006815A patent/AP2013006815A0/xx unknown
  • 2011-09-20 CA CA2811873A patent/CA2811873A1/en not_active Abandoned
  • 2011-09-20 CN CN201180045617XA patent/CN103210273A/zh active Pending
  • 2011-09-20 EA EA201390309A patent/EA201390309A1/ru unknown
  • 2011-09-20 WO PCT/NO2011/000263 patent/WO2012039624A1/en active Application Filing
  • 2011-09-20 BR BR112013006526A patent/BR112013006526A2/pt not_active IP Right Cessation
• 2013
  • 2013-03-08 ZA ZA2013/01798A patent/ZA201301798B/en unknown

Patent Citations (5)

Non-Patent Citations (1)

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