NZ774481A - Method and system for controlling suction of off-gases from electrolysis cells - Google Patents
Method and system for controlling suction of off-gases from electrolysis cellsInfo
- Publication number
- NZ774481A NZ774481A NZ774481A NZ77448119A NZ774481A NZ 774481 A NZ774481 A NZ 774481A NZ 774481 A NZ774481 A NZ 774481A NZ 77448119 A NZ77448119 A NZ 77448119A NZ 774481 A NZ774481 A NZ 774481A
- Authority
- NZ
- New Zealand
- Prior art keywords
- gas
- gas duct
- flow
- cell
- controller
- Prior art date
Links
- 239000007789 gas Substances 0.000 title claims abstract 54
- 238000000034 method Methods 0.000 title claims abstract 10
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract 7
- 230000001276 controlling effect Effects 0.000 claims abstract 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract 3
- 229910052782 aluminium Inorganic materials 0.000 claims abstract 3
- 239000004411 aluminium Substances 0.000 claims abstract 3
- 230000032258 transport Effects 0.000 claims abstract 3
- 230000001105 regulatory effect Effects 0.000 claims abstract 2
- 238000005259 measurement Methods 0.000 claims 4
- 230000003068 static effect Effects 0.000 claims 2
- 239000003570 air Substances 0.000 claims 1
- 239000012080 ambient air Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract 1
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
- B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
- C25C7/06—Operating or servicing
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 Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The present invention relates to a method and a system for controlling the normal operational suction of off-gases from individual electrolysis cells for production of aluminium, where the cells can be of Hall-Héroult type, and further being provided with a hooding (CH) connected via a gas duct (GD) to a main gas duct (MGD) having means for generating a suction that transports the gas to a gas treatment centre (GTC), where the gas flow in said gas duct (GD) is controlled by a gas duct damper (GDD). One or more process variable/s such as pressure and/or temperature in the gas duct (GD) of each cell are measured and used as input signals to a controller (PLC) comprising a calculator where the controller calculates the actual mass flow in said gas duct (GD) based upon a pre-defined algorithm and produces an output set signal corresponding to a wanted flow rate, the signal is transmitted to an actuator (A) that regulates the position of the gas duct damper (GDD), and followingly the gas flow in the gas duct from each individual cell. The regulation of the flow in the gas ducts of the individual electrolysis cells is regulated towards an optimised minimum flow. This way of controlling the suction has shown to minimise the overall flow rate and savings can be achieved both in reduced effect from the fan but also less temperature loss from each individual cell.
Claims (12)
1.
A method for controlling the normal operational suction of off-gases from individual 5 electrolysis cells (EC) in a plant for production of aluminium, the cells being of Hall- Héroult type, provided with a hooding (CH) connected via one gas duct (GD) to a main gas ducting (MGD) that transports the gas to a gas treatment centre (GTC) with suction means, where the gas flow in the gas duct (GD) can be controlled by a gas duct damper (GDD), 10 c h a r a c t e r i s e d i n t h a t one or more s variables selected from: pressure in the gas duct (GD), temperature in the gas duct (GD), pressure and temperature in the gas duct (GD), 15 are measured continuously and used as input signals to a controller (PLC) and where in addition, the pressure inside the hooding of the individual cell (CH) is measured by at least one pressure transmitter (PT’) and an input signal is accordingly transmitted to the controller (PLC), where the (PLC) comprises a calculator where the controller calculates the actual 20 mass flow in the gas duct (GD) based upon a pre-defined thm and produces an output set signal corresponding to a wanted flow rate, the signal is transmitted to an actuator (A) that regulates the position of the gas duct damper (GDD), and followingly controls the gas flow in the gas duct (GD) from individual cells; and the flow from each individual cell is optimised to a minimum where the onset of leakage 25 is an individual property of each cell, varying with the hooding efficiency, and different suction rates are applied to each individual cell for g the cells sealed and avoiding leakages to the cell’s surroundings, while still g the suction rate as low as le. 30 2. A method in accordance with claim 1, c h a r a c t e r i s e d i n t h a t the flow in the gas ducts (GD) of the individual cells in the plant are ted towards an optimized minimum flow, where the gas flow generated by the suction means of the gas treatment centre (GTC) is ed correspondingly to optimize 35 the amount of gas to be treated and the energy consumed.
3. A method in accordance with claim 1 or claim 2, c h a r a c t e r i s e d i n t h a t the flow in the gas ducts (GD) of the individual cells can be controlled and changed to quickly adjust the heat balance of the cells. 5
4. A method in ance with any one of claims 1 - 3, c h a r a c t e r i s e d i n t h a t the flow in the gas ducts (GD) of the individual cells are lled and verified with regard to a differential pressure based on measurements inside the cell’s hooding and the ambient air.
5. A method in accordance with claim 1, characterised in that said automatic damper system is kept free from ts and scaling, wherein the damper opens and closes partially at regular intervals so that ts on the damper blade are exposed to different air flows and cleaned.
6. System for controlling the normal operational suction of off-gases from individual electrolysis cells (EC) in a plant for production of aluminium, for implementing the method according to any one of claims 1-6, the cells being of Hall-Héroult type and further provided with a hooding (CH) connected via a gas duct (GD) to a main gas 20 ducting (MGD) having means for generating a suction that transports the gas to a gas treatment centre (GTC), where the gas flow in the gas duct (GD) is controlled by a damper, characterized in that the system r comprises at least one sensor for continuous measurement of process variables selected from: pressure in the gas duct (GD), 25 temperature in the gas duct (GD), pressure and temperature in the gas duct (GD), where the continuous measured value/s are represented by input signals to a ller (PLC) comprising a calculator, the system ses in addition sensor/s (PT’) for measurement of static pressure inside the cell hooding, where the 30 measured value/s are represented by additional input signals to the controller (PLC), the controller calculates the actual mass flow based upon a fined algorithm and produces an output set signal corresponding to a wanted flow rate to an actuator (A) that regulates the on of the gas duct damper (GDD) and followingly the flow in the gas duct (GD); and the flow in the gas ducts (GD) of the individual electrolysis 35 cells (EC) in the plant are regulated s an optimized minimum flow, where the gas flow generated by the suction means is adjusted correspondingly to optimize the flow.
7. System in accordance with claim 6, c h a r a c t e r i s e d i n t h a t the algorithm is based upon known relations n static pressure, ature, and suctions rates of the gas.
8. System in accordance with claim 6, c h a r a c t e r i s e d i n t h a t the controller (PLC) is an ated part of a local cell controller. 10
9. System in accordance with claim 6, c h a r a c t e r i s e d i n t h a t the controller (PLC) is an integrated part of a central controller (CPLC).
10. System in accordance with claim 6, 15 c h a r a c t e r i s e d i n t h a t the signals are transmitted either by wireless or by cable.
11. System in accordance with claim 6, c h a r a c t e r i s e d i n t h a t 20 the controller (PLC) is able to control each individual electrolysis cell (EC) as an autonomous cell, maintaining the relative pressure inside the hooding (CH) and outside of it constant by controlling the gas duct damper (GDD) based upon appropriate measurements inside and/or outside the hooding (CH), and further that a minimum suction of the cell is always maintained by controlling the gas duct 25 damper (GDD) and that changes in cell condition with regard to pressure and/or temperature are detected and ed with historical data stored in the controller (PLC), where appropriate actions regarding l of the gas duct damper (GDD) are taken. 30
12. System in accordance with claim 6, c h a r a c t e r i s e d i n t h a t the controller (PLC) comprises a digital twin model of the cell. ”WILD DILLWIIIIIID'LLELHILELL IILIIC'EIFLIILLIWHLDIIMLIDEMLZLLM) .IF'LImp-16:3Li: “‘t? ~r‘ MW L: m WEL. $39 FULL L'
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20181482A NO20181482A1 (en) | 2018-11-20 | 2018-11-20 | Method and system for controlling suction of off-gases from electrolysis cells |
| PCT/EP2019/081566 WO2020104343A1 (en) | 2018-11-20 | 2019-11-18 | Method and system for controlling suction of off-gases from electrolysis cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ774481A true NZ774481A (en) | 2023-12-22 |
| NZ774481B2 NZ774481B2 (en) | 2024-03-26 |
Family
ID=
Also Published As
| Publication number | Publication date |
|---|---|
| ZA202102193B (en) | 2022-08-31 |
| EA202191402A1 (en) | 2021-09-30 |
| WO2020104343A1 (en) | 2020-05-28 |
| CA3115415A1 (en) | 2020-05-28 |
| EP3884083A1 (en) | 2021-09-29 |
| AU2019382770A1 (en) | 2021-05-06 |
| NO20181482A1 (en) | 2020-05-21 |
| BR112021006307A2 (en) | 2021-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102748827A (en) | Room pressure controlling system | |
| CN102777999A (en) | Room pressure controlling system | |
| CN108954286B (en) | A kind of calculation method and system of boiler input dynamic assisted instruction | |
| CN113981466A (en) | Closed space hydrogen concentration monitoring and automatic adjusting method, device and system | |
| NZ774481A (en) | Method and system for controlling suction of off-gases from electrolysis cells | |
| NZ774481B2 (en) | Method and system for controlling suction of off-gases from electrolysis cells | |
| AU2008352208B2 (en) | Method and apparatus of controlling oxygen supply for boiler | |
| CN105386992A (en) | Optimal control system based on draught fan power output dynamic balance and method | |
| ATE462998T1 (en) | TEMPERATURE CONTROL | |
| JP2019049234A (en) | Extraction control method of steam turbine generator, and controller thereof | |
| JPS60231790A (en) | Automatic operation of dry coke quencher | |
| CN106884070A (en) | Automatically adjust the control system and control method of bottom-blowing of converter branch pipe flow | |
| CN110887057B (en) | Main pipe and branch pipe flow matching optimization control device and method for gas heating furnace | |
| CN103968481A (en) | Independent temperature controlling and energy saving device for subway station office platform | |
| JP2015197252A (en) | Temperature/humidity control system | |
| US20120202161A1 (en) | System and Method for Controlling Temperature in a Forehearth | |
| JP3628884B2 (en) | Steam header pressure controller | |
| RU2667408C1 (en) | Method of adaptive regulation of thermal consumption of the building | |
| JP2022155649A (en) | Room pressure control device and control method therefor | |
| CN218675827U (en) | Oxygen-free oven | |
| CN201348990Y (en) | Gasket cooling controlling device for wafer heating cavity | |
| CN104818051B (en) | Gas station load automatic control system | |
| JPH0593529A (en) | Air conditioning system of variable air-flow-rate type | |
| CN110777242B (en) | Oxidation-reduction protection device of stainless steel tube heat treatment furnace | |
| JPS6019201A (en) | Blower controller |