CA2840275A1 - Single-point control based feeding method for aluminum reduction cell feeder - Google Patents
Single-point control based feeding method for aluminum reduction cell feeder Download PDFInfo
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- CA2840275A1 CA2840275A1 CA2840275A CA2840275A CA2840275A1 CA 2840275 A1 CA2840275 A1 CA 2840275A1 CA 2840275 A CA2840275 A CA 2840275A CA 2840275 A CA2840275 A CA 2840275A CA 2840275 A1 CA2840275 A1 CA 2840275A1
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- aluminum oxide
- oxide concentration
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- 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
-
- 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
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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 Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Electrolytic Production Of Metals (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Disclosed is a single-point control based feeding method for a pre-baked anode aluminum reduction cell feeder. A feeding port is divided into different regions. Equidistant voltage drop signals are sampled on anode leaders in different regions. The anode current is calculated according to the equidistant voltage drop signal. The aluminum oxide concentration in regions of the feeding port is compared according to the variation trend of the anode current. Feeding control is performed distinguishingly for states of the regions of the feeding port. Through the method, targeted controlling can be performed on the aluminum oxide concentration in each region of the electrolytic cell, thereby improving the accuracy of the feeding control, avoiding precipitation production or effect frequency, being beneficial to stable running of the electrolytic cell, and achieving the effect of saving energy, reducing consumption and improving current efficiency.
Description
SINGLE-POINT CONTROL BASED FEEDING METHOD FOR ALUMINUM
REDUCTION.CELL FEEDER
TECHNICAL FIELD
The present invention relates to a feeding method and, in particular, to a single-point control based feeding method for a pre-baked anode aluminum reduction cell feeder.
BACKGROUND OF THE INVENTION
An aluminum reduction cell has complex feedstock balance and physical field distribution, so the concentration of aluminum oxide is not uniform among the different regions. The conventional method is the aluminum oxide concentration control method based on tracking of cell resistance, where the odd- or even-number feeders feed feedstock simultaneously at regular time using the slope of the cell resistance as the basis for control of the aluminum oxide concentration.
However, in an reduction cell, due to changes in the technical conditions and the presence of some interference factors, the definite corresponding relationship between the cell resistance and the aluminum oxide concentration changes, resulting in worse aluminum oxide concentration control effect and even control failures, leading to frequent precipitate production or effect, which in turn causes the cell to be more unstable and creates a vicious cycle, thereby having a negative impact on the electrolysis process.
To improve said method, researches have been done on the regional disparity in aluminum oxide concentration, and found that by changing the conventional simultaneous feeding at regular time by odd- or even-number feeders into feeding based on single-point control of the feeder, the cell would have a more uniform aluminum oxide concentration and a more stable performance, thereby optimizing the technical and economic indicators of the aluminum reduction cell.
DETAILED DESCRIPTION OF THE INVENTION
In order to solve the aforesaid technical problem, the present invention provides a single-point control based feeding method for an aluminum reduction cell feeder, which is designed for optimizing control of aluminum oxide concentration and enhancing the control accuracy of aluminum oxide feeding, such as to achieve a more uniform aluminum oxide concentration in and more stable operation of the reduction cell, thereby improving the current efficiency.
To said end, the present invention provides a single-point control based feeding method for an aluminum reduction cell feeder. A feeding port is allocated to each different region. Equidistance voltage drop signals are collected on anode rods in different regions. The anode current is calculated according to the equidistant voltage drop signals. The aluminum oxide concentration in the feeding port regions is compared with each other according to the variation trend of the anode current.
Feeding control is performed differently with respect to states of the feeding port regions.
A significant decrease in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is lower than the average aluminum oxide concentration in the cell; and a significant increase in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is higher than the average aluminum oxide concentration in the cell.
In said region where the aluminum oxide concentration is higher than the average level in the cell, feeding is stopped for some time until the aluminum oxide concentration therein reaches the average level in the cell; and in said region where the aluminum oxide concentration is lower than the average level in the cell, the feeding interval is cut by half until the aluminum oxide concentration therein reaches the average level in the cell.
The advantages of the present invention: targeted controlling can be performed on the aluminum oxide concentration in each region of the reduction cell 7, thereby improving the accuracy of the feeding control, avoiding frequent precipitate production or effect, facilitating stable operation of the reduction cell, and achieving the effect of saving energy, reducing consumption and improving current efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a structural schematic diagram of the present invention.
REDUCTION.CELL FEEDER
TECHNICAL FIELD
The present invention relates to a feeding method and, in particular, to a single-point control based feeding method for a pre-baked anode aluminum reduction cell feeder.
BACKGROUND OF THE INVENTION
An aluminum reduction cell has complex feedstock balance and physical field distribution, so the concentration of aluminum oxide is not uniform among the different regions. The conventional method is the aluminum oxide concentration control method based on tracking of cell resistance, where the odd- or even-number feeders feed feedstock simultaneously at regular time using the slope of the cell resistance as the basis for control of the aluminum oxide concentration.
However, in an reduction cell, due to changes in the technical conditions and the presence of some interference factors, the definite corresponding relationship between the cell resistance and the aluminum oxide concentration changes, resulting in worse aluminum oxide concentration control effect and even control failures, leading to frequent precipitate production or effect, which in turn causes the cell to be more unstable and creates a vicious cycle, thereby having a negative impact on the electrolysis process.
To improve said method, researches have been done on the regional disparity in aluminum oxide concentration, and found that by changing the conventional simultaneous feeding at regular time by odd- or even-number feeders into feeding based on single-point control of the feeder, the cell would have a more uniform aluminum oxide concentration and a more stable performance, thereby optimizing the technical and economic indicators of the aluminum reduction cell.
DETAILED DESCRIPTION OF THE INVENTION
In order to solve the aforesaid technical problem, the present invention provides a single-point control based feeding method for an aluminum reduction cell feeder, which is designed for optimizing control of aluminum oxide concentration and enhancing the control accuracy of aluminum oxide feeding, such as to achieve a more uniform aluminum oxide concentration in and more stable operation of the reduction cell, thereby improving the current efficiency.
To said end, the present invention provides a single-point control based feeding method for an aluminum reduction cell feeder. A feeding port is allocated to each different region. Equidistance voltage drop signals are collected on anode rods in different regions. The anode current is calculated according to the equidistant voltage drop signals. The aluminum oxide concentration in the feeding port regions is compared with each other according to the variation trend of the anode current.
Feeding control is performed differently with respect to states of the feeding port regions.
A significant decrease in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is lower than the average aluminum oxide concentration in the cell; and a significant increase in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is higher than the average aluminum oxide concentration in the cell.
In said region where the aluminum oxide concentration is higher than the average level in the cell, feeding is stopped for some time until the aluminum oxide concentration therein reaches the average level in the cell; and in said region where the aluminum oxide concentration is lower than the average level in the cell, the feeding interval is cut by half until the aluminum oxide concentration therein reaches the average level in the cell.
The advantages of the present invention: targeted controlling can be performed on the aluminum oxide concentration in each region of the reduction cell 7, thereby improving the accuracy of the feeding control, avoiding frequent precipitate production or effect, facilitating stable operation of the reduction cell, and achieving the effect of saving energy, reducing consumption and improving current efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a structural schematic diagram of the present invention.
2 Where 1, cell control machine; 2, aluminum oxide feeding device; 3, anode bus;
4, anode; 5, anode current collecting device; 6, anode rod; 7, reduction cell;
8, gas control cabinet; 9, signal collecting box.
EMBODIMENTS
The present invention will be further described below with reference to the drawings.
As shown in the drawings, the present invention provides a single-point control based feeding method for an aluminum reduction cell feeder. A feeding port is allocated to each different region. Equidistant voltage drop signals are collected on anode rods in different regions. The anode current is calculated according to the equidistant voltage drop signals. The aluminum oxide concentration in the feeding port regions is compared with each other according to the variation trend of the anode current. Feeding control is performed differently with respect to states of the feeding port regions.
A significant decrease in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is lower than the average aluminum oxide concentration in the cell; and a significant increase in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is higher than the average aluminum oxide concentration in the cell.
In said region where the aluminum oxide concentration is higher than the average level in the cell, feeding is stopped for some time until the aluminum oxide concentration therein reaches the average level in the cell; and in said region where the aluminum oxide concentration is lower than the average level in the cell, the feeding interval is cut by half until the aluminum oxide concentration therein reaches the average level in the cell.
Taking the 200KA reduction cell for an example, it has four feeding ports and anodes, so the reduction cell is divided equally into four regions according to the positions of the feeding ports. Normally, feeding ports 1 and 3 feed simultaneously, and feeding ports 2 and 4 feed simultaneously. When the aluminum oxide
4, anode; 5, anode current collecting device; 6, anode rod; 7, reduction cell;
8, gas control cabinet; 9, signal collecting box.
EMBODIMENTS
The present invention will be further described below with reference to the drawings.
As shown in the drawings, the present invention provides a single-point control based feeding method for an aluminum reduction cell feeder. A feeding port is allocated to each different region. Equidistant voltage drop signals are collected on anode rods in different regions. The anode current is calculated according to the equidistant voltage drop signals. The aluminum oxide concentration in the feeding port regions is compared with each other according to the variation trend of the anode current. Feeding control is performed differently with respect to states of the feeding port regions.
A significant decrease in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is lower than the average aluminum oxide concentration in the cell; and a significant increase in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is higher than the average aluminum oxide concentration in the cell.
In said region where the aluminum oxide concentration is higher than the average level in the cell, feeding is stopped for some time until the aluminum oxide concentration therein reaches the average level in the cell; and in said region where the aluminum oxide concentration is lower than the average level in the cell, the feeding interval is cut by half until the aluminum oxide concentration therein reaches the average level in the cell.
Taking the 200KA reduction cell for an example, it has four feeding ports and anodes, so the reduction cell is divided equally into four regions according to the positions of the feeding ports. Normally, feeding ports 1 and 3 feed simultaneously, and feeding ports 2 and 4 feed simultaneously. When the aluminum oxide
3 concentration in one of the regions, which are divided according to the feeding ports, is lower than the average level in the cell, feedstock should be added in a timely manner. The specific feeding manner is as follows: if it is determined that feeding port 1 lacks feedstock, feeding ports 1 and 3 feed normally, and feeding port 1 also feeds at the same time when feeding ports 2 and 4 feed simultaneously, i.e., feeding ports 1, 2 and 4 feed simultaneously. When the aluminum oxide concentration in said region is higher than the average level in the cell, feeding should be controlled in a timely manner. The specific feeding manner is as follows: if it is determined that feeding port 1 has fed too much feedstock, only feeding port 3 feeds when feeding ports 1 and 3 should feed normally, and feeding ports 2 and 4 feed normally.
Anode rod 6 is provided with anode current collecting device 5, the signal collected by said device 5 transmitted to signal collecting box 9 for preliminary treatment before being sent to cell control machine 1 for treatment. The relationship between the aluminum oxide concentration state in all the feeding port regions and the average aluminum oxide concentration in the cell is determined by the results of the treatment. Anode bus 3 is connected to the anode leader 6, which is connected at the bottom to anode 4; and aluminum oxide feeding device 2 is connected to gas control cabinet 8. According to the varying results, feeding is stopped for some time in regions where the aluminum oxide concentration is higher than the average level in the cell, until the aluminum oxide concentration therein reaches the average level in the cell; and the feeding interval is cut by half in regions where the aluminum oxide concentration is lower than the average level in the cell, until the aluminum oxide concentration therein reaches the average level in the cell.
Anode rod 6 is provided with anode current collecting device 5, the signal collected by said device 5 transmitted to signal collecting box 9 for preliminary treatment before being sent to cell control machine 1 for treatment. The relationship between the aluminum oxide concentration state in all the feeding port regions and the average aluminum oxide concentration in the cell is determined by the results of the treatment. Anode bus 3 is connected to the anode leader 6, which is connected at the bottom to anode 4; and aluminum oxide feeding device 2 is connected to gas control cabinet 8. According to the varying results, feeding is stopped for some time in regions where the aluminum oxide concentration is higher than the average level in the cell, until the aluminum oxide concentration therein reaches the average level in the cell; and the feeding interval is cut by half in regions where the aluminum oxide concentration is lower than the average level in the cell, until the aluminum oxide concentration therein reaches the average level in the cell.
4
Claims (3)
1. A single-point control based feeding method for an aluminum reduction cell feeder, characterize in that a feeding port is allocated to each different region;
equidistant voltage drop signals are collected on anode rods in different regions; the anode current is calculated according to the equidistant voltage drop signals;
the aluminum oxide concentration in the feeding port regions is compared with each other according to the variation trend of the anode current; and feeding control is performed differently with respect to states of the feeding port regions.
equidistant voltage drop signals are collected on anode rods in different regions; the anode current is calculated according to the equidistant voltage drop signals;
the aluminum oxide concentration in the feeding port regions is compared with each other according to the variation trend of the anode current; and feeding control is performed differently with respect to states of the feeding port regions.
2. The single-point control based feeding method for an aluminum reduction cell feeder according to claim 1, characterized in that a significant decrease in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is lower than the average aluminum oxide concentration in the cell; and a significant increase in the anode current in a certain feeding port region indicates that the aluminum oxide concentration in said region is higher than the average aluminum oxide concentration in the cell.
3. The single-point control based feeding method for an aluminum reduction cell feeder according to claim 2, characterized in that in said region where the aluminum oxide concentration is higher than the average aluminum oxide concentration in the cell, feeding is stopped for some time until the aluminum oxide concentration therein reaches the average aluminum oxide concentration in the cell; and in said region where the aluminum oxide concentration is lower than the average aluminum oxide concentration in the cell, the feeding interval is cut by half until the aluminum oxide concentration therein reaches the average aluminum oxide concentration in the cell.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110180528.8A CN102851704B (en) | 2011-06-30 | 2011-06-30 | Aluminum cell supplying device single-point controls baiting method |
| CN201110180528.8 | 2011-06-30 | ||
| PCT/CN2012/000750 WO2013000270A1 (en) | 2011-06-30 | 2012-05-31 | Single-point control based feeding method for aluminum reduction cell feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2840275A1 true CA2840275A1 (en) | 2013-01-03 |
| CA2840275C CA2840275C (en) | 2017-06-13 |
Family
ID=47398666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2840275A Active CA2840275C (en) | 2011-06-30 | 2012-05-31 | Single-point control based feeding method for aluminum reduction cell feeder |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN102851704B (en) |
| CA (1) | CA2840275C (en) |
| NO (1) | NO20140107A1 (en) |
| WO (1) | WO2013000270A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3417095A4 (en) * | 2016-02-15 | 2019-11-13 | Dubai Aluminium PJSC | Method for estimating dynamic state variables in an electrolytic cell suitable for the hall-héroult electrolysis process |
| CN113362912A (en) * | 2021-04-29 | 2021-09-07 | 中南大学 | Secondary simulation method and system for alumina concentration and storage medium |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105839145A (en) * | 2016-06-13 | 2016-08-10 | 中南大学 | Non-uniform blanking method for aluminum electrolytic bath |
| CN106149006A (en) * | 2016-08-28 | 2016-11-23 | 包头铝业有限公司 | A kind of aluminum cell crust breaking, the control method of blanking system |
| CN107620092A (en) * | 2017-11-06 | 2018-01-23 | 河南科达东大国际工程有限公司 | A kind of aluminium electroloysis single-point discharging control method and system |
| CN108728865B (en) * | 2018-07-03 | 2019-08-06 | 中南大学 | A kind of material bin of aluminum electrolysis tank automatically adjusting capacity and its intelligent baiting method |
| CN108914162B (en) * | 2018-08-07 | 2020-01-14 | 北方工业大学 | Method and system for controlling feeding amount of aluminum oxide |
| CN109023429B (en) * | 2018-10-30 | 2020-03-17 | 陈兆娜 | Intelligent crust breaking and intelligent feeding system and method for aluminum electrolytic cell |
| CN109876752B (en) * | 2019-03-22 | 2021-01-29 | 中南大学 | Controllable industrial aluminum electrolysis electrochemical process research method and device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57101678A (en) * | 1980-12-15 | 1982-06-24 | Mitsubishi Keikinzoku Kogyo Kk | Power supply method of aluminum electrolytic tank |
| RU2303658C1 (en) * | 2005-11-02 | 2007-07-27 | Общество с ограниченной ответственностью "Русская инжиниринговая компания" | Method for controlling technological process in aluminum cell with roasted anodes |
| RU2307881C1 (en) * | 2005-12-22 | 2007-10-10 | Общество с ограниченной ответственностью "Русская инжиниринговая компания" | Aluminum cell technical state automatic control method |
| CN101173364A (en) * | 2007-06-26 | 2008-05-07 | 中国铝业股份有限公司 | Accurate aluminum cell baiting feedback information control method |
| CN102102212A (en) * | 2009-12-17 | 2011-06-22 | 沈阳铝镁设计研究院有限公司 | Aluminum electrolysis cell region control system and method |
| CN101967658B (en) * | 2010-11-18 | 2012-08-15 | 北方工业大学 | Aluminum cell anode effect prediction device |
| CN101967659A (en) * | 2010-11-18 | 2011-02-09 | 北方工业大学 | Online monitoring system for current distribution of aluminum electrolysis cell |
-
2011
- 2011-06-30 CN CN201110180528.8A patent/CN102851704B/en active Active
-
2012
- 2012-05-31 WO PCT/CN2012/000750 patent/WO2013000270A1/en active Application Filing
- 2012-05-31 CA CA2840275A patent/CA2840275C/en active Active
-
2014
- 2014-01-30 NO NO20140107A patent/NO20140107A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3417095A4 (en) * | 2016-02-15 | 2019-11-13 | Dubai Aluminium PJSC | Method for estimating dynamic state variables in an electrolytic cell suitable for the hall-héroult electrolysis process |
| CN113362912A (en) * | 2021-04-29 | 2021-09-07 | 中南大学 | Secondary simulation method and system for alumina concentration and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102851704B (en) | 2015-11-25 |
| CA2840275C (en) | 2017-06-13 |
| WO2013000270A1 (en) | 2013-01-03 |
| NO20140107A1 (en) | 2014-01-30 |
| CN102851704A (en) | 2013-01-02 |
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Effective date: 20131223 |