CN101962786B - Control method for blowing-free heat dissipating window after starting large aluminum electrolysis cell - Google Patents
Control method for blowing-free heat dissipating window after starting large aluminum electrolysis cell Download PDFInfo
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- CN101962786B CN101962786B CN201010516139A CN201010516139A CN101962786B CN 101962786 B CN101962786 B CN 101962786B CN 201010516139 A CN201010516139 A CN 201010516139A CN 201010516139 A CN201010516139 A CN 201010516139A CN 101962786 B CN101962786 B CN 101962786B
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Abstract
The invention provides a control method for a blowing-free heat dissipating window after starting large aluminum electrolysis cell. The method comprises the following steps of: roasting a newly started cell for 3-4 days to ensure that the furnace box temperature reaches within 650-700 DEG C; pouring a liquid electrolyte; pouring liquid aluminum after all materials in the cell are melted and the temperature is increased to 980 DEG C; reducing voltage from 5.6 V to 4.3 V after 24 h, and reducing the voltage to be lower than 4.2 V after 48 h to ensure that the electrolysis cell maintains good heat balance; controlling the cell temperature to be 970-980 DEG C, and preventing the heat dissipating window from temperature increase caused by cell temperature increase; and reducing the cell temperature by salvaging carbon residues in order to prevent the increase of the cell temperature, and strictly controlling the cell temperature to be below 980 DEG C. The temperature of the heat dissipating window can be controlled between 350 DEG C and 400 DEG C by taking the measures, and an air blower is not required to reduce the temperature of the heat dissipating window; and 6000 kwh of electricity can be saved for starting each cell, and thus, the control method has great use value and economical value.
Description
Technical field
The present invention relates to large-scale aluminum electrolytic cell, particularly a kind of large-scale aluminum electrolytic cell starts the control method that back heat radiation window is not dried.
Background technology
Along with the Aluminum Electrolysis Production development of technology, the capacity of electrolyzer is increasing, and promptly increasing by the strength of current of electrolyzer, the thermal value of cell body is increasing thereupon.Powerful direct current produces electrochemical reaction by electrolyzer between anode and negative electrode, produce aluminium (sinking to furnace bottom) on negative electrode, and reaction generates outside carbon monoxide and the carbonic acid gas drain tank on carbon anode.Melt is divided into two-layerly in groove, and ionogen (ionogen is the solvent of dissolved oxygen aluminium) light specific gravity is on aluminium liquid, generally highly be controlled at 18-20cm, the aluminium liquid that generates generally highly is controlled at 25-28cm, regularly siphons away with vacuum packet, is used to make aluminium ingot or alloy product
At present, the 320KA large-scale aluminum electrolytic cell starts, because voltage descends slowly, voltage is reduced to 4.20v by 5.6v within a week, and the groove temperature reaches between 980-995 ℃.The heat of electrolyzer is mostly conducted by the heat radiation window, so that the side wall carbon block inner surface adheres to the good insulation layer of one deck solid state electrolyte as electricity and heat, thermofin, be separated into 76 heat radiation windows (each heat radiation window size 54 * 31 * 30cm) with side wall carbon block outside next-door neighbour's iron pot shell by iron plate, when electrolyzer heat is taken in too much, when the groove temperature surpasses 980 ℃, will cause heat radiation window temperature to reach between 450-500 ℃, the rubescent phenomenon of heat radiation window steel plate appears, need set up wind and arrange the cooling of drying, the window steel billet temperature that prevents to dispel the heat continues to raise to melt and causes ionogen and aluminium liquid outflow cell body in the groove, causes industrial accident.But wind row blowing cooling is set, can causes the load of compressed air station air compressor machine, increase waste of electric energy.
Summary of the invention
In sum, in order to overcome the deficiency of prior art problem, the invention provides a kind of large-scale aluminum electrolytic cell and start the control method that back heat radiation window is not dried.This method is to take newly to open groove through after 3-4 days the roasting, fire box temperature reaches between 650-700 ℃, pour into liquid electrolyte, after treating that material all melts in the groove, when rising to 980 ℃, temperature can pour into aluminium water, at this moment, operating voltage begins to descend, reduce to 4.3V at 24 hours voltage by 5.6V, voltage was reduced to below the 4.2V in 48 hours, guaranteed the good thermal equilibrium of electrolyzer; The control flume temperature prevents that the heat radiation window temperature that the groove temperature rise causes from raising between 970-980 ℃; Simultaneously, by falling measures reduction groove temperature such as ionogen, salvaging breeze, strict control flume temperature is below 980 ℃; After taking above measure, heat radiation window Controllable Temperature can reduce the temperature of heat radiation window without wind row blowing between 350-400 ℃; Advantages such as this technical matters flow process is simple, easy to operate, high safety, tool bigger use value and economic worth, but every platform trough starts brownout 6000kwh, has the promotional value that starts at large-scale aluminum electrolytic cell.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of large-scale aluminum electrolytic cell starts the control method that back heat radiation window is not dried, and this method is realized by following steps:
The first step, when electrolyzer through after 3-4 days the roasting, the groove bore temperature reaches between 650-700 ℃, can pour into 15-16 ton temperature and be 975-980 ℃ liquid electrolyte, voltage control is to 7.00-7.5V;
Second step, when shove charge material in the groove all after the fusing, during groove temperature rise to 980 ℃, need in time pour into liquid aluminium 16-18 ton, make the groove temperature control between 970-980 ℃, prevent that the heat radiation window temperature that the groove temperature rise causes from raising, at this moment, operating voltage is set between the 5.50-5.60V, and electrobath start finishes;
The 3rd step, behind electrobath start, operating voltage is reduced to 4.3V by 5.6V in 24 hours, voltage dropped to 4.2V in 48 hours, prevented aluminium cell heat income too much, so that heat radiation window temperature is controlled at below 400 ℃;
The 4th step, after pouring into aluminium liquid, groove temperature descends, breeze is separated in the groove, the salvaging breeze, the groove temperature of keeping under strict control is below 980 ℃;
The 5th step, after taking above measure, by the test of temperature-measuring gun, heat radiation window temperature effectively is controlled between 350-400 ℃, has realized the heat radiation window without wind row blowing cooling, guarantees that the safety of producing normally moves, and saves the power electricity consumption of blowing cooling.
Further, described material is sodium aluminum fluoride and electrolyte block and yellow soda ash and Calcium Fluoride (Fluorspan).
Positively effect of the present invention:
1, the present invention not only can reduce heat radiation window blowing wind row's the manufacturing cost and the troublesome operation of blowing cooling, but also can save the power energy charge of heat radiation window blowing cooling, and every platform trough can be saved power consumption 6000kwh.
2, in process test of many times and demonstration, the present invention has advantages such as technical process is simple, easy to operate, high safety, and bigger use value and economic worth are arranged.
3, the present invention can guarantee that heat radiation window temperature is normal under not blowing state, and heat radiation window Controllable Temperature can reduce the temperature of heat radiation window without wind row blowing, but produce safe operation between 350-400 ℃.
4, be beneficial effect of the present invention to be described below with the 320KA aluminium cell effect comparison table that to be example produce with new and old production technique:
(1), the maintenance of every technical qualification before the 320KA starting aluminium cell process modification
(2), the maintenance of every technical qualification after the 320KA starting aluminium cell process modification
In the table: ionogen cm represents: highly
The horizontal cm of aluminium represents: highly
Embodiment
The present invention is described in further detail below in conjunction with embodiment.
Embodiment 1
With the 320KA2011# aluminium cell is example, and control method of the present invention is described:
The 2011# groove was through 96 hours roasting, and the groove bore temperature reaches 680 ℃ of start-up temperature, and 8:30 pours into 15.8 tons 978 ℃ liquid electrolyte the morning on the 20th April in 2010; The shove charge material is sodium aluminum fluoride and electrolyte block and yellow soda ash and Calcium Fluoride (Fluorspan); 15:30 all melts and finishes in the afternoon, at this moment, owing to be in the melting materials capable state always, the heat radiation window top temperature of this aluminium cell is lower than 350 ℃, after 17:30, when the groove temperature of aluminium cell rises to 979 ℃ by 955 ℃, pour into 18 tons of liquid aluminium, operating voltage is set 5.60V, and the groove temperature control is below 971 ℃; Decrease of temperature is separated the breeze in the ionogen, salvages breeze, and voltage is reduced gradually by 5.54V; To 8:00 the next morning, voltage has been lowered to 4.26V, 400 ℃ of heat radiation window A6 top temperatures, and by the 3rd day, voltage was lowered to 4.17V, and by the test of temperature-measuring gun, heat radiation window top temperature has dropped to 375 ℃, and heat radiation window temperature has obtained effective control.
Embodiment 2
With the 320KA2057# aluminium cell is example, and control method of the present invention is described:
The 2057# groove was through 96 hours roasting, and the groove bore temperature reaches 680 ℃ of start-up temperature, and 9:10 pours into 15.6 tons of ionogen the morning on the 18th May in 2010, and the shove charge material is sodium aluminum fluoride and electrolyte block and yellow soda ash and Calcium Fluoride (Fluorspan); 16:20 all melts and finishes in the afternoon, at this moment, owing to be in the melting materials capable state always, the heat radiation window top temperature of this aluminium cell is lower than 350 ℃, after 18:30, when the groove temperature of aluminium cell rises to 978 ℃ by 965, pour into 17.5 tons of liquid aluminium, operating voltage is set 5.65V, and the groove temperature control is below 972 ℃, decrease of temperature, breeze in the ionogen is separated, salvage breeze, voltage is reduced gradually by 5.58V; To 8:00 the next morning, voltage has been lowered to 4.25V, 399 ℃ of heat radiation window A12 top temperatures, and by the 3rd day, voltage was lowered to 4.19V, and by the test of temperature-measuring gun, heat radiation window top temperature has dropped to 372 ℃, and heat radiation window temperature has obtained effective control.
Embodiment 3
With the 320KA2067# aluminium cell is example, and control method of the present invention is described:
The 2067# groove was through 96 hours roasting, and the groove bore temperature reaches 680 ℃ of start-up temperature, and 9:00 pours into 15.2 tons of ionogen the morning on the 11st June in 2010, and the shove charge material is sodium aluminum fluoride and electrolyte block and yellow soda ash and Calcium Fluoride (Fluorspan); 16:00 all melts and finishes in the afternoon, at this moment, owing to be in the melting materials capable state always, the heat radiation window top temperature of this aluminium cell is lower than 350 ℃, after 18:00, when the groove temperature of aluminium cell rises to 982 when spending by 956, pour into 17 tons of liquid aluminium, operating voltage is set 5.60V, and the groove temperature control is below 980 ℃, decrease of temperature, breeze in the ionogen is separated, salvage breeze, voltage is reduced gradually by 5.60v; To 8:00 the next morning, voltage has been lowered to 4.23V, 390 ℃ of heat radiation window A25 top temperatures, and by the 3rd day, voltage was lowered to 4.14V, and by the test of temperature-measuring gun, heat radiation window top temperature has dropped to 354 ℃, and heat radiation window temperature has obtained effective control.
Claims (2)
1. a large-scale aluminum electrolytic cell starts the control method that back heat radiation window is not dried, and it is characterized in that: this method may further comprise the steps:
The first step, when electrolyzer through after 3-4 days the roasting, the groove bore temperature reaches between 650-700 ℃, pours into 15-16 ton temperature and be 975-980 ℃ liquid electrolyte, voltage control is to 7.00-7.5V;
Second step, when shove charge material in the groove all after the fusing, during groove temperature rise to 980 ℃, need in time pour into liquid aluminium 16-18 ton, after pouring into aluminium liquid, the groove temperature descends, breeze separates better in the groove, salvages breeze and reduces the groove temperature, and the groove temperature of keeping under strict control is at 970-980 ℃, prevent that the heat radiation window temperature that the groove temperature rise causes from raising, at this moment, operating voltage is set in 5.60V, and electrobath start finishes;
The 3rd step, behind electrobath start, operating voltage is reduced to 4.3V by 5.6V in 24 hours, voltage dropped to 4.2V in 48 hours, prevented aluminium cell heat income too much, so that heat radiation window temperature is controlled at below 400 ℃;
The 4th step, after taking above measure, by the test of temperature-measuring gun, heat radiation window temperature effectively is controlled at 350-400 ℃.
2. large-scale aluminum electrolytic cell according to claim 1 starts the control method that back heat radiation window is not dried, and it is characterized in that: described material is sodium aluminum fluoride and electrolyte block and yellow soda ash and Calcium Fluoride (Fluorspan).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010516139A CN101962786B (en) | 2010-10-22 | 2010-10-22 | Control method for blowing-free heat dissipating window after starting large aluminum electrolysis cell |
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| CN201010516139A CN101962786B (en) | 2010-10-22 | 2010-10-22 | Control method for blowing-free heat dissipating window after starting large aluminum electrolysis cell |
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| CN101962786B true CN101962786B (en) | 2011-12-14 |
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| CN2644436Y (en) * | 2003-07-18 | 2004-09-29 | 中国铝业股份有限公司 | Ventilation structure for end socket cell shell of aluminum cell |
| CN2816051Y (en) * | 2005-08-09 | 2006-09-13 | 沈阳铝镁设计研究院 | Electrolyte-tank-housing ventilation radiation structure |
| CN101610047B (en) * | 2008-06-16 | 2011-04-20 | 湖南晟通科技集团有限公司 | Wind cooling type aluminum electrolytic cell waste heat utilizing device |
| CN201210659Y (en) * | 2008-06-16 | 2009-03-18 | 湖南晟通科技集团有限公司 | Residue heat utilization apparatus for wind cooling type aluminum cell |
| CN101748437A (en) * | 2008-12-03 | 2010-06-23 | 沈阳铝镁设计研究院 | Forced draught cooling system for aluminum electrolytic cell |
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