CN102534684A - Method for controlling electrolytic cell under low-voltage production - Google Patents
Method for controlling electrolytic cell under low-voltage production Download PDFInfo
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- CN102534684A CN102534684A CN2010105987736A CN201010598773A CN102534684A CN 102534684 A CN102534684 A CN 102534684A CN 2010105987736 A CN2010105987736 A CN 2010105987736A CN 201010598773 A CN201010598773 A CN 201010598773A CN 102534684 A CN102534684 A CN 102534684A
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Abstract
The invention discloses a method for controlling an electrolytic cell under low-voltage production. The method comprises the following logical steps of: 1, after a cell control machine checks an anode replacement command, automatically lifting an anode for 1.5 seconds, complementing energy in advance, and checking whether the anode is replaced completely by voltage change, and after the replacement of the anode is finished, performing anode-replacement-post additional control to ensure that the concentration of alumina is 1.5 to 2.5 percent; 2, in a process of controlling the concentration of alumina, when the cell control machine detects that voltage is increased during over-processing, and the voltage is reduced during under-processing, timely correcting to ensure that the concentration of alumina is recovered to be in a normal control area, namely the concentration of alumina is 1.5 to 2.5 percent; and after the concentration of alumina is recovered to be in the normal control area, adjusting target voltage to target voltage required when the concentration is abnormal, and performing normal control. The concentration of alumina is controlled in a whole process, so the energy compensation of the electrolytic cell, and the normal concentration of alumina are guaranteed.
Description
Technical field
The present invention relates to electrolysis of aluminum energy compensating and blanking control techniques, belong to the aluminium electrolytic control technology field.
Background technology
Under the low voltage production model, the susceptibility of electrolyzer obviously increases, and immunity from interference descends, and replacing anode, the unusual and frequent anode action of alumina concentration influence bigger to the electrolyzer condition.(1), change anode, the steering logic behind the existing replacing anode is that target voltage is raised 70MV, keeps about 1 hour time; Its objective is the energy that compensation replacing anode is taken away, adopt in this process always and owe processing mode, have partially oxidation aluminium to fall in the ionogen because change in the anodic process; Yet one hour auxiliary voltage was not enough at all when low voltage was produced, and the voltage pendulum often occurred after additional control finishes; Concentration is not controlled, and bad groove condition such as strong noise guarantees that to 4 hours ability electrolyzer is stable through testing about need 3 basically; If use existing steering logic so, all owed processing in continuous 3 to 4 hours, alumina concentration will more and more hang down and cause generating effect; Power consumption increases, and current efficiency reduces.Therefore be badly in need of changing present energy compensating and blanking strategy and solve this problem; (2), alumina concentration changes also relatively more responsive under the low voltage; More anti-than being easier to away, walking the existing control method in anti-back when alumina concentration is not to proceed concentration control, but takes pressure pole span earlier; Carry out concentration control again; Pole span is original just very low down because low voltage is produced, and presses pole span will reduce the WV of ionogen part greatly again, causes energy input not enough; Influence the ordinary production of electrolyzer, therefore must change existing control method adapts to new technology controlling and process thought; (3), because most producer hopes that all higher current efficiency is arranged; Even having reduced the WV of electrolyzer does not improve corresponding molecular ratio yet; Cause the noise of electrolyzer to increase; If the anode frequent movement will occur by existing steering logic, concentration is controlled distortion, influences the stability of electrolyzer greatly.Therefore, we must adopt a kind of new steering logic, under the prerequisite that guarantees suitable superheating temperature, should avoid frequently moving anode as far as possible.
Summary of the invention
The technical problem that the present invention will solve is, provides a kind of low voltage to produce the control method of electrolyzer down, often occurs the voltage pendulum to overcome when low voltage that prior art exists is produced, and concentration is not controlled, deficiencies such as strong noise.
In order to address the above problem, the present invention adopts following technical scheme: this method comprises following logic step, first; After slot control machine is checked through the instruction of replacing anode, promote anode 1.5 seconds earlier automatically, shift to an earlier date supplementing energy; Checking through the variation of voltage whether anode is changed then finishes; Change anode and finish the additional control after the back gets into change poles, target voltage is raised 50MV to 200MV, additional period 30 minutes to 400 minutes; Whole additional control process is carried out alumina concentration and is controlled automatically, guarantees that alumina concentration is between 1.5% to 2.5%; The second, in the alumina concentration control process,, slot control machine added voltage rising in man-hour when detecting; Owe to add voltage decline in man-hour, judge that then it is high concentration region that alumina concentration control enters into anti-district, needs in time to revise; Its way is that target voltage is raised; The amplitude of raising is that the deviation according to current voltage and target voltage decides, and (general increase rate is at 50-80MV) proceeds to owe processing then; And to make alumina concentration return to normal control area as early as possible, promptly concentration is 1.5% to 2.5% to the amplitude of owing more greatly; Target voltage when after alumina concentration returns to normal control area, target voltage being adjusted back to concentration abnormality enters into normal control process.
Supplementing energy in advance in the first step is meant: supplementing energy is meant to press and promotes anode 1.5 seconds when changing the anode key automatically in advance, raises WV 50-80 millivolt (generally more than 50 millivolts).Because the change poles process can be taken away great amount of heat, whole change poles process is remained under the higher voltage carry out, it is less to the stability influence of electrolyzer to change anode end back like this.
In second step, the amplitude that target voltage is raised is that the deviation according to current voltage and target voltage decides, and is as the criterion can dissolve the aluminum oxide that overstocks in ionogen.
When the electrolyzer noise was big, electrolytic resistance changed responsive, and carry out anode adjustment according to the target resistance of electrolyzer this moment, with current voltage adjust to target voltage ± just gets into concentration control at once in the 40MV scope.
Compared with prior art, the present invention has following advantage:
(1), additional control voltage and the additional period changed behind the anode can set according to the electrolyzer condition, the process of haveing suffered is carried out alumina concentration control, has both guaranteed that the compensation of electrolyzer energy had also guaranteed the normal of alumina concentration; Stability to improving electrolyzer has effect energetically with raising current efficiency;
(2), can not press pole span when alumina concentration is unusual, and can fast it be adapted to normal span of control;
(3), the anode that can frequently not go up and down has reduced the number of times that causes the ionogen concussion because of the anode action, and electrolyzer stable played effect energetically.
Embodiment
Embodiments of the invention: the present invention adopts a kind of new steering logic, has also created on first 240KA and the 300KA electrolyzer in the Hunan through test and having used, and effect is obvious.This invention is by following logic working: the first, when slot control machine be checked through change the anode instruction after, promote anode 1.5 seconds earlier automatically; Shift to an earlier date makeup energy; Check through the variation of voltage whether anode is changed then and finish, change anode and finish the additional control after the back gets into change poles, target voltage is raised 70MV (this auxiliary voltage can set up on their own based on concrete groove condition user); Additional period 3 hours (this additional period also can set up on their own based on groove condition user); Whole additional control procedure is carried out alumina concentration and is controlled automatically, guarantees alumina concentration between 1.5% to 2.5%, has so both guaranteed the compensation of energy; Also guaranteed alumina concentration in rational excursion, played a positive role reducing the stable of electrolytic cell noise, raising electrolytic cell and improving current efficiency to a certain extent;
The second, in the alumina concentration control process,, slot control machine added voltage rising in man-hour when detecting, owe to add voltage decline in man-hour, judge that so alumina concentration control enters into anti-district (high concentration region), needs in time its correction is come.The way of this patent is that target voltage is raised certain amplitude to dissolve the aluminum oxide that overstocks in ionogen; What are raised decides according to the deviation of current voltage and target voltage; Proceed to owe processing then; And the amplitude of owing is more greatly making alumina concentration return to normal control area (1.5% to 2.5%) as early as possible, and the target voltage when after alumina concentration returns to normal control area, target voltage being adjusted back to concentration abnormality enters into normal control process.
When the electrolyzer noise was bigger, electrolytic resistance changed relatively more responsive, and moving at every turn anodolyte resistance all changes bigger, occurs overshoot easily, and again toward opposite direction adjustment, the fall short zone is but often adjusted in action back and forth then.This patent logic is to carry out the anode adjustment according to the target resistance of electrolyzer, only just adjusts anode in normal process, crosses and processes and owe all to forbid in the course of processing moving anode; Reduced the anode action frequency; And when in the normal process process, moving anode, just get into concentration control at once, need not to wait for 10 minutes as long as current voltage is adjusted near target voltage (about positive and negative 40MV); Because voltage is easy to just exceed adjustment region and continues the up-down anode then again in the wait process; Influence normal concentration control, the anode electrolytic cell action frequency obviously reduces after the use this patent logic, and the stability of electrolyzer also increases thereupon.
Write a control module according to the described steering logic of above content, be installed on one day electrolyzer controlling machine, observe whether carry out alumina concentration control in the additional control process behind anode change, whether electrolyzer is stable for the result of control; Observe and after alumina concentration enters into anti-district, whether can in time its correction be come; Observe electrolyzer and whether can steadily get into alumina concentration control, rather than frequent upgrading anode.Constantly adjust controlled variable to reach the optimum control effect according to above observations.
Embodiment of the present invention is not limited to the foregoing description, and the various variations of under the prerequisite that does not break away from aim of the present invention, making all belong within protection scope of the present invention.
Claims (4)
1. a low voltage is produced the control method of electrolyzer down, and it is characterized in that: this method comprises following logic step, and first; After slot control machine is checked through the instruction of replacing anode, promote anode 1.5 seconds earlier automatically, shift to an earlier date supplementing energy; Checking through the variation of voltage whether anode is changed then finishes; Change anode and finish the additional control after the back gets into change poles, target voltage is raised 50MV to 200MV, additional period was at 30 minutes to 400 minutes; Whole additional control process is carried out alumina concentration and is controlled automatically, guarantees that alumina concentration is between 1.5% to 2.5%; The second, in the alumina concentration control process,, slot control machine added voltage rising in man-hour when detecting; Owe to add voltage decline in man-hour, judge that then it is high concentration region that alumina concentration control enters into anti-district, needs in time to revise; Its way is that target voltage is raised; Proceed to owe processing then, and the amplitude of owing is more greatly to make as early as possible alumina concentration return to normal control area, promptly concentration is 1.5% to 2.5%; Target voltage when after alumina concentration returns to normal control area, target voltage being adjusted back to concentration abnormality enters into normal control process.
2. low voltage according to claim 1 is produced the control method of electrolyzer down; It is characterized in that: the supplementing energy in advance in the first step is meant: supplementing energy is meant to press and promotes anode 1.5 seconds when changing the anode key automatically in advance, raises WV 50-80 millivolt.
3. low voltage according to claim 1 is produced the control method of electrolyzer down; It is characterized in that: in second step; The amplitude that target voltage is raised is that the deviation according to current voltage and target voltage decides, and is as the criterion can dissolve the aluminum oxide that overstocks in ionogen.
4. low voltage according to claim 1 is produced the control method of electrolyzer down; It is characterized in that: when the electrolyzer noise is big; Electrolytic resistance changes responsive; Carry out anode adjustment according to the target resistance of electrolyzer this moment, with current voltage adjust to target voltage ± just gets into concentration control at once in the 40MV scope.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108130560A (en) * | 2017-12-30 | 2018-06-08 | 贵阳铝镁设计研究院有限公司 | A kind of method for reducing electrolytic cell change poles process noise |
| CN108914162A (en) * | 2018-08-07 | 2018-11-30 | 北方工业大学 | Method and system for controlling feeding amount of aluminum oxide |
| CN109576738A (en) * | 2018-12-27 | 2019-04-05 | 中国神华能源股份有限公司 | Pole changing of aluminum electrolytic cell control method, storage medium and electronic equipment |
| CN111996557A (en) * | 2020-08-11 | 2020-11-27 | 杨晓东 | Method for centralized pole changing and continuous pole resting of aluminum electrolytic cell |
| CN113089029A (en) * | 2021-04-02 | 2021-07-09 | 贵州创新轻金属工艺装备工程技术研究中心有限公司 | Intelligent material control method in aluminum electrolysis production process |
| CN117210825A (en) * | 2023-09-16 | 2023-12-12 | 福建德尔科技股份有限公司 | Electrolysis control system and control method for preparing nitrogen trifluoride |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108130560A (en) * | 2017-12-30 | 2018-06-08 | 贵阳铝镁设计研究院有限公司 | A kind of method for reducing electrolytic cell change poles process noise |
| CN108914162A (en) * | 2018-08-07 | 2018-11-30 | 北方工业大学 | Method and system for controlling feeding amount of aluminum oxide |
| CN108914162B (en) * | 2018-08-07 | 2020-01-14 | 北方工业大学 | Method and system for controlling feeding amount of aluminum oxide |
| CN109576738A (en) * | 2018-12-27 | 2019-04-05 | 中国神华能源股份有限公司 | Pole changing of aluminum electrolytic cell control method, storage medium and electronic equipment |
| CN109576738B (en) * | 2018-12-27 | 2020-10-09 | 中国神华能源股份有限公司 | Aluminum electrolysis cell pole-changing control method, storage medium and electronic equipment |
| CN111996557A (en) * | 2020-08-11 | 2020-11-27 | 杨晓东 | Method for centralized pole changing and continuous pole resting of aluminum electrolytic cell |
| CN113089029A (en) * | 2021-04-02 | 2021-07-09 | 贵州创新轻金属工艺装备工程技术研究中心有限公司 | Intelligent material control method in aluminum electrolysis production process |
| CN117210825A (en) * | 2023-09-16 | 2023-12-12 | 福建德尔科技股份有限公司 | Electrolysis control system and control method for preparing nitrogen trifluoride |
| CN117210825B (en) * | 2023-09-16 | 2024-03-08 | 福建德尔科技股份有限公司 | Electrolysis control system and control method for preparing nitrogen trifluoride |
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| CN102534684B (en) | 2015-04-01 |
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Effective date of registration: 20171214 Address after: Jin Zhu Xi Lu Lake District 550081 Guizhou city of Guiyang province No. 2 aluminum technology building Patentee after: Guizhou innovation light metal processing equipment Engineering Technology Research Center Co Ltd Address before: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Patentee before: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. |
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