Shanxi Metallurgy talks about the application of thermal insulation coatings on aluminum electrolysis tanks. Aluminum production of Shanxi Longmen Aluminum Co., Ltd. Wei Lidao sorghum weaving production finally reflects the reduction of electricity consumption per ton of aluminum to achieve energy saving and reduce production costs.
In the aluminum electrolysis production process, in addition to the aluminum level, electrolyte level, molecular ratio, cell voltage and other conditions to meet certain technical requirements, temperature maintenance is also a key link, that is to say, the heat balance should reach an ideal state, suck =! put.
The heat absorption of the electrolytic cell is made by the electric work. If the heat dissipation of the electrolytic cell is small, it is not necessary to absorb too much heat. As long as the corresponding heat balance is reached, the electrolytic cell can be stably produced. Therefore, as long as the heat dissipation of the electrolytic cell is small, it is possible to make electricity less work, thereby achieving the purpose of power saving and lowering the production cost.
The heat dissipation of the electrolytic cell is divided into two parts, one part is the heat dissipation of the shell surface, and the other part is the heat dissipation around the tank shell. To reduce the heat dissipation of the shell surface, it can be achieved by adding insulation material. For the implementation of this process, each family has certain practical experience, and the thickness of the insulation material varies according to the season. However, the heat dissipation around the tank shell has not attracted the attention of the electrolysis manufacturers. Most manufacturers have not taken any measures, resulting in a large area of ​​heat dissipation, and the heat generated by the heat must be converted from electric energy to heat energy, so that The power consumption of electrolytic aluminum is increased, and the power consumption accounts for about 40Q in the production cost of electrolytic aluminum. If the power consumption can be reduced, the production cost can be reduced and the energy saving effect can be achieved.
In order to reduce the heat dissipation around the trough, we began to use insulation coatings in April this year to compare the insulation and non-insulation of the tanks of the 75kA electrolyzers No. 47, No. 48, No. 53 and No. 38 with the same technical conditions. No. 48 and No. 38 are coated with thermal insulation coating, No. 47 and No. 53 are not coated with thermal insulation coating. Through the practice of half a year, the technical indicators of the two sets of slots have changed significantly. The relevant measurement data comparison is shown in Table 1, Table 2 and Table 3 (see next page).
1The electrolytic bath coated with thermal insulation can keep the bottom of the furnace lower and the tank condition is relatively stable. The No. 47 tank has the same geographical position as the No. 48 tank, and the tank age is the same. It can be seen from Table 1 that the pressure drop at the bottom of the month is the same. . By the end of September, the bottom of the No. 47 tank had a pressure drop of 588mV, an average of 596.; and No. 48 first: Wei Lidao, male, born in 1964, graduated from Taiyuan University of Technology in 1985, majoring in electrical automation, and now serves as the China Long Aluminum Co., Ltd. Aluminum industry limited table + 47, 48 furnace bottom pressure drop table 353, 38 tank voltage, current s efficiency statistics table slot number 456789 average 53 voltage (V) 4. Table 5 4 ~ September, 3 No., No.38 and No.47, No.48, voltage, efficiency, power consumption, comparison table, trough number, average voltage (V), average efficiency (%), ton of aluminum, average DC tank coating, thermal insulation coating, and the bottom pressure drop of 459mV at the end of September. The average difference of the average of 480.83mV is 115mV0. The 53rd slot and the 38th slot are the new slots started in April this year. In 419, the average bottom pressure drop of the 53rd slot is 494.17mV, and the average pressure drop of the 38th coating insulation coating is 427.17mV. And basically stable at about 420mV, the difference between the two 67mV02 coating thermal insulation coating cell can maintain a lower cell voltage, higher current efficiency, tons of aluminum power consumption is greatly reduced. (For comparison, see Table 4 and Table 5) Table 447, No. 48 slot voltage, current efficiency statistics table slot number average number voltage (V) efficiency number voltage (V) efficiency can be seen from Table 4 and Table 5, No. 53 No. 38 was launched in April of the same year. The average efficiency of 419 was 93.475/, the average voltage was 4.380V ton, the aluminum DC power consumption was 13,737 kWh, and the average efficiency of the 38th 419 was 94.29%. The average voltage was 4.293V, and the ton aluminum DC power consumption was 13571kWh. The consumption difference is 166kWh. The 47th and 48th slots are the same, the geographical position is the same (in the middle of the plant), the average efficiency of the 47th slot is 93.35% from April to September, the voltage is 4.477V, and the average DC efficiency of the aluminum current consumption is 14.81. %, voltage 4.35V, ton aluminum direct current consumption 13970kWh, the difference is 325kWh. Through the above data, we can clearly see that the bottom pressure of the electrolytic bath coated with thermal insulation coating is lower, the tank voltage is low, the current efficiency is high, and finally the power consumption is obviously reduced. . The electricity consumption per ton of aluminum is calculated at 160 kWh, and the monthly output per tank is calculated as 157. Each tank can save about 1,500 yuan per month, so that the investment can be recovered in more than 70 days after being put into use. After the thermal insulation coating is applied to the side of the shell, the heat preservation effect is obviously increased. Compared with the uncoated tank, the furnace is relatively regular and the legs are not long. Especially after the voltage load is stopped, due to the good heat preservation effect, the anti-interference ability is strong and it is easy to quickly resume normal production.
3 Conclusion This shows that the electrolytic bath shell coating thermal insulation coating is extremely beneficial to stable production, and can save a lot of electrical energy, is a scientific way to save energy and reduce consumption and increase economic benefits.
(Continued from page 19) The 95.4% of the overall data (2) is distributed in two times the mean square error 2! Within the range (3) 99.7% of the overall data is distributed in three times the mean square error of 3! Within the scope. Therefore, the actual production is generally achieved by the indicators of 2! The value is used as the guaranteed value of the evaluation and the indicator. The smaller the value, the higher the accuracy of the control level and product quality.
This paper introduces the classification of quality assurance indicators for hot strip mills, the specific indicators and evaluation methods used in actual production, and has certain significance for determining the quality assurance value and index evaluation system for new or modified hot rolling mill production lines.
(Finish)
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