WO2020182776A1 - Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection - Google Patents
Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection Download PDFInfo
- Publication number
- WO2020182776A1 WO2020182776A1 PCT/EP2020/056280 EP2020056280W WO2020182776A1 WO 2020182776 A1 WO2020182776 A1 WO 2020182776A1 EP 2020056280 W EP2020056280 W EP 2020056280W WO 2020182776 A1 WO2020182776 A1 WO 2020182776A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- cell
- suction
- channel
- collection
- Prior art date
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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
-
- 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
- C25C3/14—Devices for feeding or crust breaking
Definitions
- the present invention relates to a method and an arrangement for collection of off gases in an electrolysis cell, in particular a cell of Hall-Heroult type for aluminium production.
- the invention relates to a dual channel gas collection system and a method for operating such system.
- the superstructure above the cell has several individual point feeders connected to the cell superstructure.
- the Pot Suction System (PSS) or gas collection system has several suction points or elongate slits distributed along one or more process gas ducts, located in the top of the superstructure, but as a separate system adjacent to the alumina feeding system. Commonly, there are two such ducts arranged in parallel.
- the air entering the inside the superstructure also provides air cooling of the upper part of the cell with its installed equipment (pneumatical-, electrical- and electronical- equipment).
- the installed equipment pneumatical-, electrical- and electronical- equipment.
- PTS Pot Tending Suction
- the gas suction can change from normal PS (Pot Suction) to PTS (Pot Tending Suction), and the increased suction volume enables handling the anode replacements with several lids removed from the cell without flue gases entering the potroom, i.e maintaining the negative pressure inside the cell super structure.
- Feeding alumina to an electrolysis cell was performed more than a century ago by manually breaking the top crust of alumina and feeding alumina powder to the cell.
- the crust breakage was later done by a crust breaking wheel, then a crust breaker beam and finally an electronically controlled point crust breaker, which is being installed at basically all new smelters being built. Hence, point feeding is therefore considered as state of the art.
- the present invention generally relates to a dual system for gas collection from the cells, one system that is operated during pot tending such as anode change, i.e. a Pot Tending Suction System (PTS) and a system that operates during normal mode and that collects the process gases close to the crust of the cell, by a Distributed Pot Suction (DPS).
- the DPS can be constructed as an integrated part inside the cell’s superstructure and can have alumina feeders integrated.
- the invention relates to a method of collection of concentrated, process gas for further treatment.
- this DPS enables collection of process gas with enough elevated temperatures suitable for heat-recovery, such as flue gas that has a temperature of more than 100°C, preferably more than 150°C.
- WO 2006/009459 there is described a method and equipment for heat recovery from exhaust raw gas from an electrolysis plant for the production of aluminium.
- This type of technology can advantageously be combined with the present invention.
- Various industrial processes produce process gases that can be contaminated by particles, dust and other species that can cause fouling in energy recovery equipment. Such fouling will imply reduced efficiency and may require extensive maintenance such as cleaning of the surfaces exposed to the gas flow.
- Process gas may, before it is cleaned, contain dust and/or particles that will form deposits on the heat recovery equipment and thus reduce the efficiency of the heat recovery to an undesired low level.
- energy recovery units are normally placed downstream a gas cleaning plant, after the gas has been cleaned.
- Cooling the process gas will contribute to reduced gas flow rate and pressure drop, with reduced fan power as a consequence.
- the largest reduction in pressure drop is achieved by cooling the process gas as close to the aluminium cells as possible.
- the energy content of the process gas can be recovered in a heat exchanger (heat recovery systems) in which the process gas gives off heat (is cooled) to another fluid suitable for the application in question.
- the heat recovery system can be located: upstream of the cleaning process - where the heat recovery system must operate with a gas containing particles
- Cooling of the raw gas upstream the fans in combination with heat recovery is a solution that will reduce both the process gas volume flow rate and the pressure drop in channel system and gas cleaning plant.
- the suction can thereby be increased without the need of changing the dimensions of channels and gas cleaning plant.
- the heat recovered from the process gas is available as process heat for various heating and processing purposes, like CO2 sequestration.
- EP2337879B1 discloses a suction device for gas collection that is able to obtain an efficient collection of the flue gases produced in the cell with a limited amount of alumina or anode cover material (ACM) entering the suction device. In the combination with a point feeder this gives a compact design.
- ACM anode cover material
- US Patent 4,770, 752 from 1988 describes a system where the gas collection cap is placed in contact with the crust in correspondence of a hole provided in the crust.
- the purpose of this invention is to collect the flue gases from the cell for purification of fluoride components by bringing the components in contact with alumina particles and thereafter return the alumina and the fluorides to the cell again by a separate alumina feeder. CO2 scrubbing and heat recovery are not mentioned except from preheating the alumina.
- This invention has a limitation with respect to maintenance and possible damages occurring during anode replacements since the cap is situated so close to the anodes and the crust. There is no indication of any plant which utilised this invention, supporting the said drawbacks.
- JP Patent 57174483 from 1981 describes a method and device for continuous measurement of current efficiency of an aluminium electrolysis cell.
- the purpose is to measure current efficiency quickly and continuously and to control supplying of raw materials by collecting the gases produced from the cell continuously, measuring the concentrations of CO2 and CO successively, converting these to electrical signals and inputting the signals to a controller.
- the collection device is not fully described but seems to be situated in contact with the crust with the drawbacks just described.
- US Patent 4,770,752 from 1988 describes a system where a cap is placed in contact with the crust in correspondence of a hole provided in the crust.
- the purpose of this invention is to collect the flue gases from the cell for purification of fluorine components by alumina situated close to the cell and thereafter feed the alumina and said components directly back into the same cell from which they have been emitted.
- US Patent 5,968,334 describes removal of at least one of the gases CF and C2F6 from the flue gases from an electrolysis cell using a membrane.
- the present invention relates an integrated equipment with plural Distributed Pot Suction (DPS) zones where one can combine feeding the raw material alumina to the cell and at the same time extract a more CC concentrated flue gas from several holes in the top crust in the cell than what is standard procedure in the aluminium industry today.
- DPS Distributed Pot Suction
- the suction can also be arranged at other places above the crust in the cell, if appropriate.
- the present invention relates to a dual channel gas collection system for collection of hot gas from an electrolysis process producing aluminium in a cell of Hall-Heroult type.
- the cell comprising PTS (Pot Tending Suction) channels with openings for collecting gas, said channels being arranged in the superstructure of the cell outside a gas hooding (GH) of the cell, and wherein inside the gas hooding (GH) there is arranged a DPS (Distributed Pot Suction) system.
- the DPS (Distributed Pot Suction) system comprises a designed gas channel that runs along the extension of the hooding, where the channel is provided with gas collection balanced suction cap(s).
- the method involves that the suction from the caps are individually tuned and optimized so that the suction rate is substantially equal at each cap along the channel.
- all process gas or substantially all gas is collected via gas collecting cap(s) arranged in the common DPS channel which allows that the energy for gas suction and the amount of gas removed can be optimized at a sufficiently but low level.
- Fig. 1 a discloses one embodiment of a dual system comprising (DPS) and (PTS) in accordance with the invention, seen from one side, where the DPS is arranged inside a cell’s superstructure,
- Fig. 1 b discloses the embodiment shown in Fig. 1 , seen in perspective
- Fig. 1 c discloses the DPS channel of Fig. 1 a and Fig. 1 b, seen from above,
- Fig. 2 discloses in a cross-sectional view the dual system of DPS and PTS of Fig.
- Fig. 3 discloses details of a DPS collector opening together with a point breaker installed therein, above a hole in a crust,
- Fig. 4 discloses the embodiment of the dual system comprising (DPS) and (PTS) in accordance with Fig. 1 , where arrows indicates how the gas flows in each separate system.
- FIG. 1 a there is shown a DPS suction arrangement adapted to a cell.
- the arrangement comprises a gas channel 10 that runs along the longitudinal direction of the cell.
- the gas channel 10 has integrated gas collection caps 1 1 , 12, 13, 14, 15, 16 and an outlet OT.
- This channel 10 is seen from above in Fig. 1 c, which discloses the gas collection caps correspondingly. Further, it can be seen that the cross-section area of the channel 10 increases in the direction of the suction.
- the parts between the suction caps are to avoid dead rooms and further to achieve the desired velocity in the duct.
- a PTS Pot Tending Suction
- two gas channels 20, 30, (only channel 20 shown in Fig. 1 a for sake of clarity), where both are running in the longitudinal direction of the cell.
- These channels are arranged outside the gas hooding GH of the cell (see Fig. 2) and the channels have chimneys that communicates with the interior of the gas hooding GH.
- channel 20 is provided with chimneys 21 , 22, 23, 24, 25, 26.
- a pneumatic cylinder of a crust breaker is indicated at reference sign 1 , the breaker is attached to the gas channel of the DPS.
- a gas collection cap 16 In Figure 2 there is shown a gas collection cap 16, a chisel of a breaker bar 4, and a gas suction duct 10.
- Fig. 3 shows these elements in a cross-sectional view and an enlarged scale where the collection cap is indicated at 16, the chisel of the breaker bar at 4.
- the chisel is guided by a guiding tube 5.
- the guiding tube 5 is arranged inside a shielding tube 6, leaving an annular space 7 between them for supply of a cooling medium, such as air.
- the cooling medium can be supplied from an upper location of the arrangement and leaving the annular space 7 at positions 7’, 7”. This gas flow may also be applied for flushing the inner cap with fresh air to protect components/materials from aggressive process gas.
- An alumina feeding tube may be arranged inside the collection cap 16 (not shown).
- the feeding tube is arranged in a space between an inner wall of the cap 16 and the outer wall of the shielding tube 6.
- the chisel of the breaker bar 4 is operated periodically to secure that a hole H in the crust C is open for feeding materials through the hole and into the electrolyte (not shown) below the crust.
- the gas flow out of the pot’s hooding is collected through the DPS, where preferably a feeding point is placed at each of the gas collection caps 1 1 , 12, 13, 14, 15, 16 of the pot.
- the alumina may be feed from a fluidised feeder but also via mechanical feeders.
- the gas When the gas is drawn through the gas collection caps 1 1 , 12, 13, 14, 15, 16, see Fig. 4, it will be collected into the duct 10 inside the hooding of the pot, conveying gas from all feed points.
- the gas is from this transition points transported to the fume treatment systems (i.e. Fluoride recovery, and SO2 removal) and introduced from there to any commercial CO2 scrubbing system able to handle the actual concentrations of CO2 or as input to combustion systems such as gas turbines, coal power plants or biomass combustion plant.
- the PTS When the pot is to be serviced the PTS is activated, and gas is collected from the inside of the gas hooding GH of the cell via the two gas channels 20, 30 and chimneys that communicates with the interior of the gas hooding GH. See also Fig. 1 b where chimneys are indicated at reference signs 21 to 26 and 31 to 36.
- PTS gas channels are indicated at 20, 30, while two corresponding chimneys are indicated at 25, 35 respectively and having openings 25’, 35’ communicating with the interior of the gas hooding (GH).
- the gas collection via the DPS is stopped during this operation.
- Fig.4 illustrates for simplifying reasons in the same figure how the gas is extracted via chimneys 21 , 22, 23, 24, 25, 26 and flows into channel 20 together and how the gas flows via the gas collection caps 1 1 , 12, 13, 14, 15, 16 and into the channel 10.
- the main ducts in the pot superstructure is activated to support pot tending suction (PTS) from the pot (i.e. increasing the pot suction volume 2-4 times higher than normal.
- PTS pot tending suction
- the up-concentrated process gas is hotter than normal which makes it suitable for heat recovery.
- the warmer gas may damage the superstructure and electronics placed there.
- One way to solve this new challenge is to arrange all major hot gas components of the DPS inside the cell’s hooding and thermally insulate relevant part of the gas hooding towards the parts of the superstructure comprising vulnerable parts of breakers and feeding apparatus etc. It may also be possible to reduce the heat flux form the DPS channel 10 by appropriate thermal insulation.
- Process gases from several cells can be connected to the same heat recovery unit.
- the process gas is then sent for classical fume treatment, removing dust, HF and SO2.
- the flue gas might have to be purified sufficiently not to damage these process steps.
- the main features of one embodiment of the present invention consist in the integration of the point suction system with the alumina point feeder having a crust breaker.
- the step forward caused by the DPS is changed composition and increased temperature of the collected process gas.
- the gas collected by the DPS will contain much less“false air” and consequently have higher concentration of hazardous gases (Fluoride, SO x , and CO2). This will ease the fluoride recovery and SO x removal.
- the aim is to increase the concentration of CO2 to such a level that commercially available CO2 scrubbing technologies can be utilised to remove it. Also, because of the smaller amount of air and installation straight above the feeding points the collected off-gas has increased temperature compared to the regular process gas, which increases the potential for heat exchange.
- process gas collection cap could be customised for any type of point feeder, and also be arranged in the vicinity of such feeder without being an integrated part of it.
- the walls of the suction cap 1 1 can be of an oval cross section and slanting upwards in an outward direction.
- the point feeder can preferably be installed in a manner where it will be as less as possible affected by the heat inside the cells’ hooding.
- the tip of the breaker can be actively cooled by a flow of cooling gas, such as pressurised air flowing from a lance (not shown).
- the gas collection caps 1 1 , 12, 13, 14, 15, 16 are preferably placed at a distance from the crust allowing operating space for the anodes during anode change, see for instance the arrangement of gas collection cap 1 1 and the anodes A’, A” in fig. 2.
- the cap is placed at a minimum distance to the crust depending on the suction rate.
- the distance is in order 10 to 1000 mm.
- the designed distance has to take into account the pickup velocity for alumina/anode cover material (ACM) which is in order of 7 metres per second, hence the said distance between the cap and the top of the crust should ensure that this level of velocities at the surface of the crust is not reached.
- ACM alumina/anode cover material
- This embodiment of DPS is designed to separate by physical measures the hot gas to be sucked off and the technical parts of the crust breaker as much as possible, to induce as little thermal stress as possible to vital parts of the crust breaker.
- the dual collection of hot gas from an electrolysis process producing aluminium in a cell of Hall-Heroult type can comprise a pair of PTS (Pot Tending Suction) channels connected with openings (25’, 35’) for collecting gas from the cell during pot tending operations.
- PTS Pult Tending Suction
- the gas is collected in close vicinity of a feeding hole(s) in the crust in the cell by gas collecting cap(s) arranged in a common DPS (Distributed Pot Suction) channel, wherein the suction along the channel is tuned in such that the suction rate is substantially equal at each cap along the channel. All process gas or substantially all gas is collected via at least two gas collecting cap(s) arranged in the common DPS channel.
- DPS Distributed Pot Suction
- the C02 capture and storage in accordance with the present invention can in one embodiment be performed in the following steps:
- the system is a maintenance friendly modular system having chimneys and caps.
- the point feeders can be changed from the top, one by one.
- the breakers can be provided with a cooling arrangement.
- Suction caps can be provided with individual collection flaps.
- the channel has an increasing dimension in the direction of the gas flow.
- DPS channel has a brownfield option, i.e. there is an option to install it during the lifecycle of a cell, for instance when it is taken out of production due to relining.
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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)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA3133373A CA3133373A1 (en) | 2019-03-14 | 2020-03-10 | Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection |
NZ778775A NZ778775B2 (en) | 2020-03-10 | Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection | |
EP20710892.9A EP3938564B1 (en) | 2019-03-14 | 2020-03-10 | Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection |
EA202192477A EA202192477A1 (en) | 2019-03-14 | 2020-03-10 | DEVICE FOR COLLECTING HOT GAS FROM ELECTROLYSIS PROCESS AND METHOD OF SUCH GAS COLLECTION |
BR112021015866-9A BR112021015866A2 (en) | 2019-03-14 | 2020-03-10 | DUAL CHANNEL GAS COLLECTION SYSTEM FOR HOT GAS COLLECTION, AND METHOD FOR DUAL HOT GAS COLLECTION |
AU2020233972A AU2020233972A1 (en) | 2019-03-14 | 2020-03-10 | Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection |
ZA2021/05691A ZA202105691B (en) | 2019-03-14 | 2021-08-11 | Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20190343A NO20190343A1 (en) | 2019-03-14 | 2019-03-14 | Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection |
NO20190343 | 2019-03-14 |
Publications (1)
Publication Number | Publication Date |
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WO2020182776A1 true WO2020182776A1 (en) | 2020-09-17 |
Family
ID=69804880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2020/056280 WO2020182776A1 (en) | 2019-03-14 | 2020-03-10 | Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP3938564B1 (en) |
AU (1) | AU2020233972A1 (en) |
BR (1) | BR112021015866A2 (en) |
CA (1) | CA3133373A1 (en) |
EA (1) | EA202192477A1 (en) |
NO (1) | NO20190343A1 (en) |
WO (1) | WO2020182776A1 (en) |
ZA (1) | ZA202105691B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113789549A (en) * | 2021-09-28 | 2021-12-14 | 中南大学 | Flue gas treatment system based on fully-closed aluminum electrolytic cell |
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US4033846A (en) * | 1975-09-16 | 1977-07-05 | Lista Og Mosjoen Aluminiumverk, Elkem Aluminum A/S & Co. | Apparatus for gas collection in aluminum smelting furnaces |
US4770752A (en) | 1986-07-15 | 1988-09-13 | Techmo Car S.P.A. | Process for purifying the gases emitted from the electrolysis pots for the production of aluminum and related equipment |
US5968334A (en) | 1996-12-23 | 1999-10-19 | American Air Liquide Inc. | Process for recovering CF4 and C2 F6 from vent gases of an aluminum production cell |
WO2006009459A1 (en) | 2004-07-23 | 2006-01-26 | Norsk Hydro Asa | A method and equipment for heat recovery |
US20070240996A1 (en) * | 2006-04-18 | 2007-10-18 | Schadrin Valery G | Apparatus for collection and removal of gases from an aluminum reduction cell |
EP2440689A1 (en) * | 2009-06-10 | 2012-04-18 | SOLIOS Environnement | System and method for recovering energy |
EP2337879B1 (en) | 2008-09-19 | 2016-12-14 | Norsk Hydro ASA | A device for collection of hot gas from an electrolysis process, and a method for gas collection with said device |
Family Cites Families (5)
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EP1845175B1 (en) * | 2006-04-11 | 2011-02-16 | Aluminium Pechiney | System and process for collecting effluents from an electrolytic cell |
CN102312253A (en) * | 2010-06-29 | 2012-01-11 | 沈阳铝镁设计研究院有限公司 | Double-flue pipe gas-collecting pipeline system of aluminum electrolytic tank and control method |
CN102776531A (en) * | 2011-05-09 | 2012-11-14 | 贵阳铝镁设计研究院有限公司 | Burner gas collection apparatus of aluminum electrolysis cell |
RU2668617C1 (en) * | 2017-11-20 | 2018-10-02 | Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" | Device for collection and removal of gases in aluminium electrolysis cell |
CN110042432B (en) * | 2019-05-05 | 2020-06-05 | 中南大学 | Closed gas collecting device for aluminum electrolytic cell |
-
2019
- 2019-03-14 NO NO20190343A patent/NO20190343A1/en unknown
-
2020
- 2020-03-10 CA CA3133373A patent/CA3133373A1/en active Pending
- 2020-03-10 AU AU2020233972A patent/AU2020233972A1/en active Pending
- 2020-03-10 BR BR112021015866-9A patent/BR112021015866A2/en unknown
- 2020-03-10 EP EP20710892.9A patent/EP3938564B1/en active Active
- 2020-03-10 WO PCT/EP2020/056280 patent/WO2020182776A1/en active Application Filing
- 2020-03-10 EA EA202192477A patent/EA202192477A1/en unknown
-
2021
- 2021-08-11 ZA ZA2021/05691A patent/ZA202105691B/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US4033846A (en) * | 1975-09-16 | 1977-07-05 | Lista Og Mosjoen Aluminiumverk, Elkem Aluminum A/S & Co. | Apparatus for gas collection in aluminum smelting furnaces |
US4770752A (en) | 1986-07-15 | 1988-09-13 | Techmo Car S.P.A. | Process for purifying the gases emitted from the electrolysis pots for the production of aluminum and related equipment |
US5968334A (en) | 1996-12-23 | 1999-10-19 | American Air Liquide Inc. | Process for recovering CF4 and C2 F6 from vent gases of an aluminum production cell |
WO2006009459A1 (en) | 2004-07-23 | 2006-01-26 | Norsk Hydro Asa | A method and equipment for heat recovery |
US20070240996A1 (en) * | 2006-04-18 | 2007-10-18 | Schadrin Valery G | Apparatus for collection and removal of gases from an aluminum reduction cell |
EP2337879B1 (en) | 2008-09-19 | 2016-12-14 | Norsk Hydro ASA | A device for collection of hot gas from an electrolysis process, and a method for gas collection with said device |
EP2440689A1 (en) * | 2009-06-10 | 2012-04-18 | SOLIOS Environnement | System and method for recovering energy |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113789549A (en) * | 2021-09-28 | 2021-12-14 | 中南大学 | Flue gas treatment system based on fully-closed aluminum electrolytic cell |
Also Published As
Publication number | Publication date |
---|---|
AU2020233972A1 (en) | 2021-08-26 |
ZA202105691B (en) | 2022-08-31 |
EP3938564A1 (en) | 2022-01-19 |
CA3133373A1 (en) | 2020-09-17 |
NZ778775A (en) | 2023-12-22 |
EP3938564B1 (en) | 2023-04-26 |
NO20190343A1 (en) | 2020-09-15 |
EA202192477A1 (en) | 2021-12-07 |
BR112021015866A2 (en) | 2021-10-05 |
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