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The Reaserch And Application Of Integrated Low-voltage Energy-saving Technology For The240kA Aluminium Reduction Cell

Posted on:2014-11-25Degree:MasterType:Thesis
Country:ChinaCandidate:Z Y XuFull Text:PDF
GTID:2181330431499636Subject:Metallurgical Engineering
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Abstracts:In China, Aluminum electrolysis industry is facing the serious pressure of energy and environmental, energy-saving has become the important goal of the electrolytic aluminum industry. Because of overcapacity at domestic, reforming the current electrolytic technics&control technology and developing one new energy-saving technologies based on the existing production facilities, which has become the main way to achieve energy-saving target and get the benign development for the most of domestic aluminum electrolytic enterprises.In recent years, Aluminum electrolysis process With low-voltage has been an important direction of research and development of aluminum electrolytic energy-saving technologies at home. The paper started at analysis of cell voltage, it discussed the feasibility of reducing on the cell voltage, and studied the main factors affecting the electrolyte pressure drop in depth, as well as the relations between the current efficiency and Polar distance and the improving of the current strength. The impact of the technical conditions for electrolytic aluminum to low voltage process has been analyzed comprehensive, on the basis of which, Low voltage technical conditions which characterized by "high current density, low cell voltage, low temperature, low superheat, low alumina concentration, and low anode effect coefficient "have been established. An intelligent multi-loop cooperative control technology has been developed, which target in order to achieve the "three narrow work region"(narrow material balance, narrow heat balance, narrow MHD adjusting region).Integrated energy-saving technologies(The process technology of Five low and one high&the control technology of three narrow) have been applied to the240KA series electrolytic cell on Nan-Ping Aluminum Co, Ltd over one year, through continuous optimization and improvement, which achieved significant energy-saving effect eventually:the cell voltage dropped from4.05V to3.900V, The series current improved from244KA to246KA, During January-April of2012, the average DC power consumption was12800Kwh/t-Al, which reduced314Kwh/t-Al than before the implementation of low-voltage technology.
Keywords/Search Tags:aluminum, low-voltage, current-strengthen, energy-saving
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