EP3119927A1 - Installation de traitement de gaz de cuves d'electrolyse pour la production d'aluminium - Google Patents
Installation de traitement de gaz de cuves d'electrolyse pour la production d'aluminiumInfo
- Publication number
- EP3119927A1 EP3119927A1 EP15714582.2A EP15714582A EP3119927A1 EP 3119927 A1 EP3119927 A1 EP 3119927A1 EP 15714582 A EP15714582 A EP 15714582A EP 3119927 A1 EP3119927 A1 EP 3119927A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- exchangers
- exchanger
- gases
- installation according
- sheath
- 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.)
- Granted
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
- C25C3/22—Collecting emitted gases
Definitions
- the present invention relates to electrolysis cell gas treatment plants for the production of aluminum. It relates more particularly to the positioning of the heat exchangers used for cooling the gases before their treatment.
- the heat exchangers are generally several for a Gas Treatment Center (GTC) because the maximum capacities of the exchangers are limited by manufacturing and process constraints.
- GTC Gas Treatment Center
- the flow rates of gas to be treated which represent very large volumes (typically 2 000 000 Nm3 / h for a GTC), are typically distributed over four to thirty two exchangers.
- This cooling decreases the efficiency of the heat recovery in the exchangers if a recovery of the energy recovered on the gases is envisaged.
- This energy can, for example, be used for ORC cycle power generation, district or space heating, cooling production, seawater desalination or any industrial use.
- the document EP 2 431 499 A1 describes a configuration locating the exchangers at the outlet of the electrolysis cell. The recovered temperatures are then maximum because closer to the source, but this multiplies their number because there is one for each tank (typically 190 electrolytic cells for a BGT processing 2,000,000 Nm3 / h and as many exchanger units). However, this imposes a cooling circuit for each tank and many maintenance interventions. An intervention on an exchanger imposes a temporary stop of suction on the tank concerned.
- the patent also describes a bypass system on each tank which is an extremely expensive solution given the number of additional sheaths and valve sets required (three per tank).
- the invention provides a solution to these problems.
- the invention relates to a gas treatment plant from electrolysis tanks for the production of aluminum, comprising at least one collection pipe collecting the gases from the electrolysis tanks, at least one inlet duct bringing the gases. to a gas processing center, and a plurality of heat exchangers placed between the at least one collection line and the at least one inlet sheath bringing the gases to a gas processing center.
- Each heat exchanger can operate independently of the others and is equipped with isolation devices on both sides of the exchanger. The exchangers thus make it possible to cool the gases before entering the gas treatment center.
- the heat exchangers are placed in parallel on the at least one inlet duct bringing the gases to a gas treatment center.
- the installation further comprises at least one input plenum connecting the at least one collection duct to the inlet of the heat exchangers for distributing the gases in all or part of the heat exchangers, and at least one output plenum connecting the output of the heat exchangers to the at least one inlet duct bringing the gases to a gas treatment center to collect the gases before entering the gas treatment center.
- the installation further comprises one or more of the following characteristics, taken individually or in any technically possible combination:
- the installation comprises a plurality of collection ducts, connecting ducts providing at least one connection of the collection ducts between them, the connecting ducts being connected to the input plenum entrance.
- ducts Collectors run along rows of electrolysis tanks, and the connecting ducts make it possible to combine the gases of each line of tanks;
- a set of heat exchangers is placed on each connecting pipe
- a set of heat exchangers is typically composed of two to twelve heat exchangers
- the heat exchangers are advantageously of the tubular type with circulation of the gases to be cooled outside the tubes and circulation of the cooling fluid inside said tubes;
- a set of exchangers is placed at the junction between a collection duct and a connecting duct;
- a set of exchangers is placed at the junction between the connecting ducts and the inlet duct;
- the installation further comprises an intermediate sheath at the junction between the connecting ducts, a set of heat exchangers being placed at the junction between the intermediate sheath and the inlet duct;
- the exchangers are placed in the vicinity of the ducts;
- Isolation devices are placed on either side of each exchanger
- An exchanger is present in standby to replace an exchanger taken out of service
- the exchangers and the connecting ducts with these exchangers are provided with inclined flanges, the upper base being wider than the lower base;
- a gantry equipped with a lifting means is placed above the exchangers to facilitate the maintenance operations of the exchangers; - An exchanger is replaced by a sheath portion of dimensions and identical pressure drop coefficient.
- Fig. 1 is a schematic top view of an aluminum production unit according to the state of the art
- Fig. 2 is a schematic perspective view of the implementation of a set of 4 exchangers according to a first embodiment of the invention
- FIG. 3 is a schematic elevational view of the implantation example shown in FIG. 2
- Fig. 4 is a schematic perspective view of the implementation of a set of 4 exchangers according to a second embodiment of the invention.
- Fig. 5 is a schematic elevational view of an exemplary implantation according to an alternative embodiment of the invention.
- FIG. 1 there can be seen a gas treatment plant from electrolysis tanks 2 for the production of aluminum, said tanks being placed in two parallel rows 3.
- Gas collection means are provided for extracting everything or so selective gas from the electrolysis tanks 2.
- Collecting conduits 5 run along the electrolysis tanks and collect the gases captured at the tanks.
- Two connecting ducts 6 provide a connection between the collection ducts 5, running along the tanks 2 and which are located vis-à-vis one another. These two connecting ducts 6 marry to join an inlet duct 7 which brings the gas to a gas treatment center 8 (GTC).
- GTC gas treatment center 8
- Each set of exchangers 9 comprises a plurality of heat exchangers 9 placed in parallel and is associated to a plenum 13 input into a plenum 14 output.
- a set of heat exchangers 9 comprises a number N, preferably between two and twelve, of heat exchangers.
- the exchangers 9 of the assembly are, according to the example, placed in the vicinity of the connecting ducts 6, that is to say just after the junction between two ducts 6 connecting the collectors.
- the two connecting ducts 6 are assembled in a common inlet plenum 13 from which N upstream exchanger sheaths each connect to the inlet of a heat exchanger 9.
- the output of each exchanger 9 of the assembly is connected to a casing 17 downstream exchanger, and an outlet plenum 14 collects all the cooled gases at the outlet of N ducts 17 downstream exchanger and then connects to the sheath 7 input of GTC 8.
- a set of exchangers 9 may be placed on each connecting duct 6, or at each junction between a collection duct 5 and a connecting duct 6 or after the combination, or joining, of the ducts 6 connecting in an intermediate sheath, that is to say between this intermediate sheath and the sheath 7 input.
- the installation can thus comprise several sets of exchangers 9, each associated with an inlet plenum 13 and an exit plenum 14.
- Each exchanger 9 is associated with an isolation device, for example a guillotine-type valve 16, upstream and downstream in order to isolate it completely. More specifically, a guillotine valve 16 is placed on the upstream exchanger sheath 15, near the inlet of the exchanger 9, and a guillotine valve 16 is placed on the sheath 17 downstream exchanger, near the outlet of the exchanger 9.
- the advantage of this configuration is that in the event of maintenance of an exchanger, it can be isolated using guillotine valves 16, the assembly then operating at N-1 exchangers 9.
- the fans and the GTC 8 are designed to ensure the suction flow rates when the assembly operates at N-1 exchangers 9.
- the installation comprises an additional exchanger 9 placed in stand-by, c that is, it is not in operation.
- the number of exchangers in service is maintained during maintenance operations. Indeed, when an exchanger 9 must be replaced, then the additional exchanger 9, in stand-by, is put into operation, so that there is always N-1 exchangers 9 in operation. N-1 operation is then the case of standard operation of the installation.
- the case of standard operation of the installation is with all N exchangers 9 in operation.
- the maintenance operations are carried out during cold periods so that the operation at N-1 exchangers 9 is acceptable by the installation throughout the duration of the maintenance.
- a reserve exchanger can replace the exchanger requiring maintenance.
- the exchanger 9 requiring maintenance is replaced, between the upstream exchanger sheath 15 and the corresponding exchanger duct 17, by a sheath portion 19 of dimensions and load loss coefficient identical to the exchanger 9 removed.
- This configuration makes it possible to cool a proportion of (N-1) / N of the gases during the maintenance of exchanger 9 without modifying the operation of the other N-1 exchangers.
- This operation with N-1 exchangers 9 is preferably carried out when the gas cooling and operating requirements of the heat exchangers are not maximum, typically outside the hot periods and preferably in the winter.
- a gantry January 1 provided with a lifting means, for example winch type 12, can be installed above said exchangers 9 to allow the removal of a heat exchanger 9 when it has been previously isolated by the valves guillotines 16.
- the guillotine valves 16 are controlled from the gantry 1 1 which overhangs the N intermediate sheaths in which the heat exchangers are located so that the guillotine valves 16 can move vertically to obstruct or not the corresponding sheath.
- the guillotine valves 16 and the exchangers 9 are controlled from below the upstream exchanger 15 and 17 exchanger downstream sheaths between which the exchangers 9 are placed.
- the guillotine valves 16 mount vertically and rest on the ground in the open position.
- the flanges 18 for separating the upstream exchanger sheath 15 and the exchanger 9 are inclined, as are the flanges 18 separating the exchanger 9 from the exchanger casing 17, so that an upper base of the exchangers 9 is wider than a lower base. The introduction and withdrawal of the exchanger 9 from its functional position is facilitated, guided by the shape of the exchangers.
- a heat exchanger 9 is for example in the form of a set of tubes between which the gases to be cooled pass.
- the number of tubes varies according to different parameters of the installation such as the quantity of gas to be cooled, the flow rate, the space requirement, etc.
- a heat exchanger 9 comprises between 500 tubes and 1500 tubes.
- a cooling fluid for example water, circulates inside the tubes to provide cooling of the gases in contact with the outside of the tubes.
- the cooling fluid circuit within a heat exchanger 9 may advantageously be independent of that of the other exchangers 9 of the same assembly. More specifically, the cooling fluid flowing in an exchanger 9 does not come directly from another exchanger 9 or feeds another exchanger 9.
- each heat exchanger 9 can be made independent of others easily, without reviewing the circuit supply of cooling fluid of all the exchangers 9. The maintenance is again facilitated.
- the heat exchangers 9 of the same set are preferably identical, and in particular comprise the same number of tubes of the same dimensions.
- the plenum 13 makes it possible in particular for the gas velocity to be as uniform and constant as possible in the upstream exchanger sheaths feeding the exchangers 9, independently of the number of exchangers 9 forming the assembly. Thus, even when an exchanger 9 is rendered unavailable for maintenance operations for example, the inlet plenum 13 ensures the distribution of the gases at the inlet of the heat exchangers 9 remaining in operation.
- casings 17 downstream exchanger open to the plenum 14 output then to the conduit 7 bringing the gas to the center 8 of gas treatment.
- the invention consists in particular in placing exchangers 9 in parallel, downstream of the collection lines 5 of the tank gases 2 and upstream of the GTC inlet ducts 7, between two plenums 13, 14 of in order to have a good distribution of gases at the inlet of these exchangers.
- the exchangers 9 are advantageously placed relatively close to the electrolysis tanks 2 to have warmer gases increasing the efficiency of the recovery if recovery of heat recovery is provided. This also makes it possible to choose the number of exchangers 9 and not to be dependent on the number of tanks 12 or filters.
- the exchangers 9 within the same group also has an individual character thanks in particular to the isolation device 16, so that they can be isolated from each other so as to perform maintenance, operation N- 1, inspection, removal or other handling without involving the stop of the GTC 8, and while ensuring the good distribution at the entrance of each exchanger 9 in operation.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1452416A FR3018826A1 (fr) | 2014-03-21 | 2014-03-21 | Installation de traitement de gaz de cuves d'electrolyse pour la production d'aluminium |
PCT/FR2015/050554 WO2015140445A1 (fr) | 2014-03-21 | 2015-03-06 | Installation de traitement de gaz de cuves d'electrolyse pour la production d'aluminium |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3119927A1 true EP3119927A1 (fr) | 2017-01-25 |
EP3119927B1 EP3119927B1 (fr) | 2018-01-24 |
Family
ID=50877466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15714582.2A Active EP3119927B1 (fr) | 2014-03-21 | 2015-03-06 | Installation de traitement de gaz de cuves d'electrolyse pour la production d'aluminium |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3119927B1 (fr) |
CN (1) | CN106103807B (fr) |
CA (1) | CA2937667A1 (fr) |
FR (1) | FR3018826A1 (fr) |
NO (1) | NO3119927T3 (fr) |
WO (1) | WO2015140445A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3112842A1 (fr) * | 2020-07-24 | 2022-01-28 | Reel Alesa | Dispositif de refroidissement d’effluents gazeux provenant d’une installation pour la production d’aluminium par electrolyse ignee |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19845258C1 (de) * | 1998-10-01 | 2000-03-16 | Hamburger Aluminium Werk Gmbh | Anlage zum Absaugen der Abgase und zur Nutzung ihrer Abwärme für eine Anlage zur Aluminiumschmelzflußelektrolyse mit mehreren Elektrolysezellen |
NO314469B1 (no) * | 2001-06-25 | 2003-03-24 | Alstom Technology Ltd | Fremgangsmåte og anordning for gasstransport |
GB0705439D0 (en) * | 2007-03-22 | 2007-05-02 | Alstom Intellectual Property | Improved flue gas cooling and cleaning arrangment |
WO2008154391A1 (fr) * | 2007-06-06 | 2008-12-18 | Alcoa Inc. | Échangeur de chaleur |
CN201473610U (zh) * | 2009-09-10 | 2010-05-19 | 沈阳铝镁设计研究院 | 降低电解烟气温度的系统 |
EP2407228B1 (fr) | 2010-07-14 | 2016-09-07 | General Electric Technology GmbH | Unité de nettoyage des gaz et procédé de nettoyage des gaz |
CN102373486A (zh) * | 2010-08-26 | 2012-03-14 | 沈阳铝镁设计研究院有限公司 | 铝电解残极冷却系统及冷却方法 |
EP2431498B1 (fr) * | 2010-09-17 | 2016-12-28 | General Electric Technology GmbH | Échangeur thermique de cuve d'électrolyse pour la réduction d'aluminium |
EP2431499B1 (fr) | 2010-09-17 | 2014-04-23 | Alstom Technology Ltd | Système de collecte de gaz brut |
CN102817046A (zh) * | 2012-07-27 | 2012-12-12 | 中国铝业股份有限公司 | 一种铝电解槽的挥发烟气的处理方法 |
-
2014
- 2014-03-21 FR FR1452416A patent/FR3018826A1/fr not_active Withdrawn
-
2015
- 2015-03-06 EP EP15714582.2A patent/EP3119927B1/fr active Active
- 2015-03-06 CN CN201580004608.4A patent/CN106103807B/zh not_active Expired - Fee Related
- 2015-03-06 NO NO15714582A patent/NO3119927T3/no unknown
- 2015-03-06 WO PCT/FR2015/050554 patent/WO2015140445A1/fr active Application Filing
- 2015-03-06 CA CA2937667A patent/CA2937667A1/fr not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2015140445A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR3018826A1 (fr) | 2015-09-25 |
WO2015140445A1 (fr) | 2015-09-24 |
NO3119927T3 (fr) | 2018-06-23 |
CA2937667A1 (fr) | 2015-09-24 |
CN106103807B (zh) | 2019-04-19 |
EP3119927B1 (fr) | 2018-01-24 |
CN106103807A (zh) | 2016-11-09 |
CN106103807A8 (zh) | 2017-03-01 |
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