CN101260541A

CN101260541A - Fast voltage-reducing energy-saving starting method for aluminum electrolysis bath

Info

Publication number: CN101260541A
Application number: CNA200710180560XA
Authority: CN
Inventors: 张松江; 赵继安; 康定军
Original assignee: Henan Zhongfu Industry Co Ltd
Current assignee: Henan Zhongfu Industry Co Ltd
Priority date: 2007-11-28
Filing date: 2007-11-28
Publication date: 2008-09-10
Anticipated expiration: 2027-11-28
Also published as: CN101260541B

Abstract

The invention discloses a method for quick starting, voltage reduction and energy conservation of an aluminum cell, comprising the following steps that: the molecule ratio is quickly reduced by maintenance of the electrolysis temperature in the aluminum cell on the basis of the prior art; the intermediate electrolysis temperature is maintained; the low-effect coefficient is matched so as to maintain the aluminum level and the electrolyte level at adequate height; operation of low alumina concentration in the cell is maintained; the operating voltage is quickly reduced; a hearthside of the electrolytic cell is quickly formed; and the new energy balance is established, which lays a foundation for quick reduction of the voltage. By adoption of the invention, compared with normal starting and final-period management, a single electrolytic cell directly reduces 12 volt voltage or so and directly saves 92200 degree electricity; moreover, when the electrical energy is saved, the influence of intermediate production management on equipment is declined; the service life of the electrolytic cell is indirectly improved and exhaust of dusty gases is reduced; the production operating cost is indirectly reduced and the aim of environmental control is achieved.

Description

The method of starting aluminium cell fast voltage-reducing energy-saving

Technical field:

The present invention relates to a kind of power-economizing method, particularly relate to a kind of method of starting aluminium cell fast voltage-reducing energy-saving.

Background technology:

Energy-saving and cost-reducing is the theme that China advocates, and the electrolysis of aluminum industry itself is exactly a highly energy-consuming manufacturing enterprise, and how to cut down the consumption of energy also is the research object of each aluminum electrolysis industry.The aluminum electrolysis bath after-starting management is a necessary process before aluminium cell puts into production, the final-period management process time traditional in this process is long, the voltage height, the electrolyzer temperature is high, and energy consumption is big, volatile matter increases, environmental influence is increased, and the final-period management to electrolyzer simultaneously causes bigger management difficulty, and the ordinary production of managing improperly simultaneously to electrolyzer has a far reaching influence, and reduce the life-span of electrolyzer, increase the cost of electrolyzer.

The growing tension of State Grid's supply at present; country is to the environmental requirement increasingly stringent; reduce cost and carry out the theme that environmental protection is an enterprise; in present large-scale pre-baked electrolysis production management, study novel technical measures, improve electrolysis production operation conditions and environment; cut down the consumption of energy; reduce production costs and improve Working environment, improve bath life, increasing economic efficiency and protecting environment that very significant meaning is arranged.

Summary of the invention:

Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, a kind of method of starting aluminium cell fast voltage-reducing energy-saving is provided, it can reduce production energy consumption than traditional technology in the electrolyzer final-period management, changes the ordinary production management in advance over to.

The technical scheme that the present invention is taked for the technical solution problem is:

A kind of method of starting aluminium cell fast voltage-reducing energy-saving comprises conventional production method, and its technical parameter is as follows:

The maintenance of electrolysis temperature in A, the aluminium cell: behind the electrobath start, the groove temperature is higher, purpose is material is fully melted and to proceed the roasting coking, but spend the life-span that long high temperature keeps influencing on the contrary equipment, therefore, only keeping 3～5 days by original about one month 985～990 ℃ temperature in the maintenance of groove temperature, temperature was 975～980 ℃ during temperature was reduced to gradually later on, kept 25～35 days, after this be reduced to 970～975 ℃, kept 15 days, and be reduced to 965～970 ℃ then, pit temperature progressively is reduced to the ordinary production scope;

The maintenance of B, molecular ratio, though the groove temperature drop is low, it is higher that but molecular ratio still keeps, set up firm stove group by high molecule ratio, preceding 3～5 days molecular ratio remains on about 2.8～3, and molecular ratio remained on 2.6～2.8 in 25～35 days subsequently, after this be reduced to 2.5～2.7 in 15 days, be reduced to 2.4～2.5 then, reduce superheating temperature, important effect is arranged stablizing electrolysis production by high molecule ratio and middle temperature control.The formation of stove group and the formation tool of burner hearth are had certain effect;

C, the stable alumina concentration of adjusting: remain in the groove alumina concentration behind the electrobath start and in very little scope, keep and move, by modification and adjustment to the computer control system parameter, adjust the alumina blanking amount, make first week of its alumina content by 2～3% original stable carrying out the transition between 2～2.5%, second week is as stablizing the transitional period, the 3rd week is from 2～2.5% stable carrying out the transition between 1.5～2.5%, the trace of alumina content changes in the gutter, reduces the effect odds;

D, suitable aluminium level and the electrolyte level of maintenance: traditional electrobath start later stage aluminium level keeps lower, generally be controlled between 16～18cm, the fast voltage-reducing technology is taked the control of high alumina level, the aluminium level is improved 2cm, remain between 18～20cm, electrolyte level keeps traditional level not change, and helps the stable of electrolyzer like this, for keeping in the electrolyzer temperature control and set up burner hearth and played steady guaranteeing role, created good condition for reduction voltage fast simultaneously;

E, effective controlling influence coefficient: traditional electrobath start later stage, adopt the method for high effect coefficient to come treatment trough condition and regular burner hearth, the fast voltage-reducing technology adopts low effect control coefficient control and technology, the effect coefficient of traditional 0.5～1 time/groove day was adjusted to below 0.3 time/groove day, the ultimate effect coefficient was reduced to below 0.1 in one month, and keep as required, effectively control reduces during the burner hearth foundation its influence;

F, reduce voltage fast: traditional high-voltage hold-time in electrobath start later stage is long, set up burner hearth to cooperate high-temperature macromolecule, after reducing the employing of voltage technology fast, original one month voltage is reduced to time decreased to the 5 day time of 4.3V from 6V, be reduced to 4.15V from 4.3V and need one month maintenance to shorten to 5 days original, and minimum voltage is reduced to about 4.1V, after this 4.1V is longer to the 4V voltage-transition time, original startup final-period management three months were reduced to present 40～50 days like this, make electrolyzer set up type in the firm burner hearth fast, change the ordinary production state early over to, only the time of this shortening has been obtained energy-saving effect preferably with regard to direct saving electric weight 9.22 ten thousand degree electricity.

Positive beneficial effect of the present invention is:

1. the method for starting aluminium cell fast voltage-reducing energy-saving of the present invention, it is transformed on the basis of traditional electrobath start final-period management technology, adjustment by one group of technical qualification keeps scheme, cooperate and reduce electric tank working voltage fast and shorten the time that starts back high-voltage and normal voltage transition, thereby satisfy the requirement of energy balance, the high-voltage of electrolyzer after start, high energy consumption state shift ordinary production state, be formed on middle temperature, low alumina concentration, the operation down of low effect coefficient, set up the regular burner hearth of electrolyzer rapidly, reach than the innovation of tradition startup Technology and the purpose that cuts down the consumption of energy.

2. because the present invention has kept lower alumina concentration in inheriting tradition aluminum electrolysis bath after-starting management technique, in on the basis of warm electrolysis temperature, by adjustment to alumina concentration, by adjustment to molecular ratio, reach low overheat, keep suitably two levels of height, stably manufactured, burner hearth is set up fast, set up new energy balance, lay the foundation for reducing voltage fast, make quick reduction voltage technology adopt the back directly to reduce about voltage 12V than conventional startup final-period management, direct saving electric energy 9.22 ten thousand degree electricity, the separate unit electrolyzer has energy-saving effect like this, be applied to 282 electrolyzers of series and electrolyzer behind the electrolytic cell overhaul in the future, its energy-saving effect is inestimable; In energy-conservation, wherein warm production management has reduced the influence to equipment, has improved the life-span and the discharging that has reduced dusty gas of electrolyzer indirectly, the purpose that has reduced the production run cost indirectly and administered environment.

Embodiment:

Embodiment 1: a kind of method of starting aluminium cell fast voltage-reducing energy-saving, and its technical parameter is as follows:

The maintenance of B, molecular ratio, though the groove temperature drop is low, it is higher that but molecular ratio still keeps, set up firm stove group by high molecule ratio, preceding 3～5 molecular ratio remains on about 2.8～3, and molecular ratio remained on 2.6～2.8 in 25～35 days subsequently, after this be reduced to 2.5～2.7 in 15 days, be reduced to 2.4～2.5 then, reduce superheating temperature, important effect is arranged stablizing electrolysis production by high molecule ratio and middle temperature control.The formation of stove group and the formation tool of burner hearth are had certain effect;

In the present invention: the technology of Xiang Ximiaoshuing partly is not known technology.

Claims

1. the method for a starting aluminium cell fast voltage-reducing energy-saving comprises conventional production method, it is characterized in that:

The maintenance of electrolysis temperature in A, the aluminium cell: 985～990 ℃ of temperature condition kept 3～5 days down; 975～980 ℃ of temperature condition kept 25～35 days down; 970～975 ℃ of temperature condition kept 15 days down, were reduced to 965～970 ℃ then, and pit temperature progressively is reduced to the ordinary production scope;

The maintenance of B, molecular ratio: molecular ratio remained on about 2.8～3 in preceding 3～5 days, and molecular ratio remained on 2.6～2.8 in 25～35 days subsequently, was reduced to 2.5～2.7, and was reduced to 2.4～2.5 then in after this 15 days;

C, the stable alumina concentration of adjusting: first week of alumina content, second week, the 3rd week was from 2～2.5% stable carrying out the transition between 1.5～2.5% as stablizing the transitional period by 2～3% original stable carrying out the transition between 2～2.5%;

D, suitable aluminium level and the electrolyte level of maintenance: electrobath start later stage aluminium level remains between 18～20cm, and electrolyte level keeps traditional level not change;

E, effective controlling influence coefficient: effect coefficient was controlled at below 0.3 time/groove day, and the ultimate effect coefficient was reduced to below 0.1 in one month;

F, reduce voltage fast: voltage is 5 days from the time that 6V is reduced to 4.3V, and the time that is reduced to 4.15V from 4.3V is 5 days, and after this 4.1V is 30～40 days to the 4V voltage-transition time.