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DC power consumption per ton of aluminum has been reduced to 13000 , - 14000kW \u0026 h , but aluminum electrolytic energy utilization is only about 40% . Reduce the average cell voltage and current efficiency point of view , many scholars to do in-depth research of aluminum electrolytic energy saving . But from the perspective of energy balance analysis, Aluminum in about 50% of the energy emitted in the form of heat to the environment , wherein the top of the electrolyzer fins 48% , 43% of the side fins , the bottom of the heat sink 9% . To achieve the target of energy saving aluminum electrolytic process , on the electrolyzer the side of the waste heat recovery and its influencing factors were studied. Firstly, the energy of the aluminum cell balanced electrolyzer heat distribution and heat of the electrolyzer , comprehensive design of this experiment new waste heat recovery type electrolytic cell structure , the heat transfer medium suitable for the present experiment is selected . Then in heating element coke electrolyzer recovery power and recovery efficiency of the heat exchanger molten salt flow and input power . The power recovery and recycling efficiency With the increase or decrease in the input power under the same conditions , within a certain range to increase or decrease the flow of heat transfer molten salt . Under the same conditions in the heat exchanger molten salt flow , within a certain range to increase or reduce the input power of the electrolytic cell , recycling power along with a corresponding increase or decrease , but the recovery efficiency does decrease with increasing input power With the decrease of the input power increases . Finally, the aluminum electrolytic process heat molten salt flow recovery power and recovery efficiency . Electrolysis , the electrolysis temperature to 900 ° C , a current efficiency of 90% , the current fluctuations within the range of the 1865A-2056A , voltage fluctuations in the 11.53V-12.36V . Maintaining stable electrolysis conditions , when the flow of the molten salt of the heat exchanger is increased , the power recovery and recycling efficiency increases. When the molten salt heat exchanger flow rate of 135.5 cm3 / s , the average recovery power of 9890W , the recovery efficiency of 41.9 % , fully meet the electrolytic process waste heat recovery effect .
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