EP1936011A1 - Appareil et procédé de suppression de gaz - Google Patents

Appareil et procédé de suppression de gaz Download PDF

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Publication number
EP1936011A1
EP1936011A1 EP06026549A EP06026549A EP1936011A1 EP 1936011 A1 EP1936011 A1 EP 1936011A1 EP 06026549 A EP06026549 A EP 06026549A EP 06026549 A EP06026549 A EP 06026549A EP 1936011 A1 EP1936011 A1 EP 1936011A1
Authority
EP
European Patent Office
Prior art keywords
suction
booster
ducts
electrolysis
gasses
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.)
Withdrawn
Application number
EP06026549A
Other languages
German (de)
English (en)
Inventor
Pieter Dirk Kiut
Petrus Leonardus Verbraak
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.)
Danieli Corus Technical Services BV
Original Assignee
Danieli Corus Technical Services BV
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 Danieli Corus Technical Services BV filed Critical Danieli Corus Technical Services BV
Priority to EP06026549A priority Critical patent/EP1936011A1/fr
Priority to RU2009128041/02A priority patent/RU2450090C2/ru
Priority to BRPI0720698-4A2A priority patent/BRPI0720698A2/pt
Priority to PCT/EP2007/010266 priority patent/WO2008074386A2/fr
Priority to ES07846831.1T priority patent/ES2564171T3/es
Priority to US12/519,411 priority patent/US8449738B2/en
Priority to CA2673431A priority patent/CA2673431C/fr
Priority to EP07846831.1A priority patent/EP2108059B8/fr
Priority to AU2007334985A priority patent/AU2007334985B2/en
Priority to CN200780049896.0A priority patent/CN101589180B/zh
Publication of EP1936011A1 publication Critical patent/EP1936011A1/fr
Priority to NO20092728A priority patent/NO20092728L/no
Withdrawn legal-status Critical Current

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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
    • C25C3/22—Collecting emitted gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/002—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using a central suction system, e.g. for collecting exhaust gases in workshops

Definitions

  • the invention relates to an apparatus for the removal of gasses from a number of electrolysis cells, the apparatus comprising a suction duct for each cell, each suction duct being connected to a central manifold with a gas treatment centre and a central suction fan.
  • the invention also relates to a method for the removal of such gasses.
  • gasses are produced that can be harmful for the environment and the working conditions in the pot room. Especially in the aluminium electrolysis process harmful gasses containing fluorides and fluoride particles are emitted.
  • the last decades major improvements have been implemented to reduce the emission of both fluoride particles and gasses containing fluorides.
  • the emission of the fluoride particles now is at an acceptable level due to an efficient adsorption system.
  • the emission of gasses containing fluorides still is a problem for the environment, especially during anode change, tapping and maintenance of the electrolysis cells.
  • the aluminium electrolysis cells are shielded very effectively during the normal operation of the cells.
  • the openings in the cells at both sides are hooded such that approximately 99.5 % of the openings are covered.
  • a suction duct is provided above the hoods, on each side of the cell to extract the gasses containing fluorides that are still emitted.
  • These gasses are led through a manifold to a gas treatment centre, such as a scrubber, using a central suction fan.
  • This normal suction is efficient enough to reduce the emission of the gasses containing fluorides that enter the pot room and are emitted to the environment to an acceptable level.
  • an apparatus for the removal of gasses from a number of electrolysis cells comprising a suction duct for each cell, each suction duct being connected to a central manifold with a gas treatment centre and a central suction fan, wherein a flow restriction device is provided in each suction duct, and wherein one or more additional ductworks are provided, each additional ductwork for one or more suction ducts, wherein each additional ductwork has a branch for each suction duct, the branch being connected to the suction duct between the electrolysis cell and the flow restriction device, which one or more branches are connected to a booster duct in which an on/off valve is present, one or more booster ducts being connected to a booster manifold which is connected to the central manifold, a booster fan being provided in the booster manifold.
  • the branches of the additional ductworks are connected to the suction ducts between the electrolysis cell and the flow restriction device, the boosted suction will not be hampered by the flow restriction devices.
  • a flow restriction device has to be present, to be able to perform a normal suction that is approximately equal for each cell. Without flow restriction devices, the gasses from the cells nearest to the central suction fan would be extracted at a much higher volume than the gasses from the cells connected to the central manifold far from the central suction fan, due to the resistance of the central manifold. Since a flow restriction device will cause a resistance to the flow of the gasses, it is advantageous to connect the branches of the additional ductworks to the suction ducts such that the boosted suction is not hampered by the flow restriction devices.
  • each additional ductwork has been provided with two or more suction ducts, preferably each additional ductwork has been provided with two suction ducts.
  • each additional ductwork has been provided with two suction ducts.
  • One additional ductwork for two suction ducts is preferred so as to keep the branches of the ductwork of equal length.
  • At least one of the suction ducts that is provided with an additional ductwork is free of valves such as on/off valves, preferably at least half of the suction ducts is free of valves, and more preferably all suction ducts are free of valves. Since the branches of the additional ductworks are connected to the suction ducts between the cells and the flow restriction device in the suction duct, during the boosted suction the gasses that are emitted by the cells are extracted, and no gasses or only a limited amount of gasses are extracted from the central manifold (which still extracts gasses from electrolysis cells where normal suction is used).
  • the on/off valves in the booster ducts are automatic valves, controlled by a central control unit.
  • Using automatic on/off valves means that the valves need not be operated by hand, which makes the switching of the valves at the right time easier.
  • booster ducts for eight to twenty electrolysis cells are connected to one booster manifold. This means that the boosted suction for eight to twenty electrolysis cells can be performed with one booster fan. This booster fan is dimensioned such that only one additional ductwork can be used at a time.
  • each booster duct is connected to two suction ducts, and seven booster ducts are connected to one booster manifold. This means that for an electrolysis plant having 700 electrolysis cells only 350 on/off valves and 50 booster fans are needed, whereas for the known additional ductwork to extract gasses 1400 valves are needed.
  • the central suction fan provides a suction volume of 2000 to 10000 N m 3 /h for each electrolysis cell during use, preferably a suction volume of 4000 to 6000 N m 3 /h for each electrolysis cell during use.
  • This suction volume is suitable for a normal extraction of gasses by the suction ducts, such that the extraction of gasses from the hooded electrolysis cells is efficient enough to reduce the emission of harmful gasses to the environment to an acceptable level.
  • a central suction fan set configuration is provided for approximately hundred twenty electrolysis cells.
  • the booster fan provides a suction volume for two suction ducts that is two to four times as high as the suction volume provided by the central suction fan for each electrolysis cell during use. With this suction volume, the emission of gasses is reduced to an acceptable level.
  • the electrolysis cells are aluminium electrolysis cells.
  • the present invention is especially suitable for the aluminium electrolysis process, but can also be used for other electrolysis processes by which harmful gasses are emitted.
  • the invention also relates to a method for performing an electrolysis process, wherein gasses formed during the electrolysis process are removed using an apparatus as described above.
  • the gasses formed are gasses containing fluorides formed during an aluminium electrolysis process using the Hall-Heroult method. These gasses containing fluorides are harmful for the environment and the emission thereof has to be reduced to a very considerable extent, in accordance with government regulations.
  • the additional ductworks are used for extraction of gasses when one or more of the electrolysis cells are open.
  • Fig. 1 shows, in a schematic way, a preferred embodiment of a suction system for electrolysis cells according to the present invention.
  • Fig. 1 shows six aluminium electrolysis cells 1 that are connected by a suction duct 2 for each cell to a central manifold 3.
  • the central manifold 3 ends in a gas treatment centre 4 and a central suction fan 5.
  • the central suction fan 5 usually consists of a number of fans, and normally hundred twenty electrolysis cells 1 are connected to one central manifold 3.
  • the suction ducts split above the electrolysis cells such that two ducts are present above the cells, one at each side. These ducts above the cells have openings through which the gasses emitted by the cells are extracted.
  • each suction duct 2 a flow restriction device 6 is present, such that the volume of the gasses that is extracted from each electrolysis cell is approximately equal for each cell. Without the flow restriction devices, the volume that is extracted from the cell nearest to the central suction fan 5 is much higher than the volume extracted from the cell that is furthest away from the central suction fan 5, due to the resistance of the central manifold 3.
  • the flow restriction of each flow restriction device is adapted to the place of each cell relative to the central suction fan 5.
  • the above suction system is used during normal operation of the electrolysis process, when the electrolysis cells are hooded or shielded and 99,5 % of the openings in the cells are covered.
  • Additional ductworks are present, to be used when panels in the hoods of the electrolysis cells are (partly) removed for changing of the anodes in the cells, for tapping and for maintenance of the cells.
  • each additional ductwork 10 consists of a booster duct 11 with two branches 12 that are connected to two suction ducts 2.
  • an on/off valve 13 is present in the booster duct 11 .
  • a number of additional ductworks 10 is connected to a booster manifold 14, in which a booster fan 15 is present.
  • the booster manifold 14 ends in the central manifold 3.
  • fourteen cells are connected to a booster manifold 14 through seven ductworks 10, and five or six of such booster manifolds 14 end in one central manifold 3.
  • the on/off valve 13 for these electrolysis cells 1 is opened and the booster fan 15 is started.
  • the gasses emitted by the electrolysis cells 1 from which panels are removed are extracted by the booster fan 15 through the respective branches 12, booster duct 11 and booster manifold 14.
  • the branches 12 of the additional ductworks 10 are connected to the suction ducts 2 between the electrolysis cells and the flow restriction devices 6, no on/off valves need to be present in the suction ducts 2 to close off the suction ducts to prevent inflow from the central manifold 3 when the additional ductworks are used.
  • the flow restriction devices 6 prevent backflow of gasses from the central manifold 3 to such an extent that no on/off valves in the suctions ducts 2 are needed, which provides a huge cost reduction in building the suction system.
  • the central manifold 3 can even add to the extraction of gasses when the volume of the boosted suction is not too high.
  • the central suction fan 5 should provide a suction flow of approximately 5000 N m 3 /h in each suction duct 2.
  • the boosted suction should be two to four times as high, so approximately 15000 N m 3 /h.
  • other suction flows can be used.
  • the harmful gasses contain fluorides, but also other polluting elements such as PAH's, SO2, SO3 and dust. PAH's and dust are also removed in the gas treatment centres (PAH is abbreviation of Polycyclic Aromatic Hydrocarbon).
  • each electrolysis cell a ductwork is provided, and an embodiment in which each ductwork has three or more braches for three or more electrolysis cells. It will also be understood that the number of ductworks connected to the booster duct can be varied.
  • apparatus and method according to the invention can also be used for other electrolysis process besides aluminium electrolysis.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
EP06026549A 2006-12-21 2006-12-21 Appareil et procédé de suppression de gaz Withdrawn EP1936011A1 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
EP06026549A EP1936011A1 (fr) 2006-12-21 2006-12-21 Appareil et procédé de suppression de gaz
US12/519,411 US8449738B2 (en) 2006-12-21 2007-11-27 Apparatus and method for the removal of gasses
BRPI0720698-4A2A BRPI0720698A2 (pt) 2006-12-21 2007-11-27 Aparelho e método para a remoção de gases
PCT/EP2007/010266 WO2008074386A2 (fr) 2006-12-21 2007-11-27 Appareil et procédé pour le retrait de gaz
ES07846831.1T ES2564171T3 (es) 2006-12-21 2007-11-27 Equipo y método para la eliminación de gases
RU2009128041/02A RU2450090C2 (ru) 2006-12-21 2007-11-27 Способ удаления газов и устройство для его осуществления
CA2673431A CA2673431C (fr) 2006-12-21 2007-11-27 Appareil et procede pour le retrait de gaz
EP07846831.1A EP2108059B8 (fr) 2006-12-21 2007-11-27 Appareil et procédé de suppression de gaz
AU2007334985A AU2007334985B2 (en) 2006-12-21 2007-11-27 Apparatus and method for the removal of gasses
CN200780049896.0A CN101589180B (zh) 2006-12-21 2007-11-27 除去气体的装置和方法
NO20092728A NO20092728L (no) 2006-12-21 2009-07-20 Apparat og fremgangsmate for fjerning av gasser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06026549A EP1936011A1 (fr) 2006-12-21 2006-12-21 Appareil et procédé de suppression de gaz

Publications (1)

Publication Number Publication Date
EP1936011A1 true EP1936011A1 (fr) 2008-06-25

Family

ID=38039131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06026549A Withdrawn EP1936011A1 (fr) 2006-12-21 2006-12-21 Appareil et procédé de suppression de gaz

Country Status (1)

Country Link
EP (1) EP1936011A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158226A (en) * 1984-05-03 1985-11-06 Pechiney Aluminium Process and apparatus for suction extraction particularly for use in the production of aluminium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158226A (en) * 1984-05-03 1985-11-06 Pechiney Aluminium Process and apparatus for suction extraction particularly for use in the production of aluminium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
M. KARLSEN, R. HUGLEN: "Reduction of Fluoride Emissions", PROC. 6TH AUST. AL SMELTING WORKSHOP, 1998, XP002436026 *

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