ANALYSIS OF THE COKE BED PREHEATING METHOD FOR ALUMINIUM CELLS

摘要

Resistor coke bed preheating method is the most commonrnmethod used in aluminium cells preheating. This was basedrnon typical start-up anode effect as well as on typicalrncathode heat-up rate during preheat and start-up. Therndrawbacks of this method were studied and modified tornenable the best performance for cells preheating. Thesernmodifications include coke bed thickness, preheating time,rnusing flexible anode connections, fixing cathode carbonrnblocks and ramming paste sources and adaptation of thernprocedures for preheating. These modifications improvedrnfrom pot lives, and lowered the electrical energy and cokernconsumption during the preheating process. Also, the effectrnof workers experience on the performance of preheatingrnwas studied.