Reform And Trial Of 320kA Aluminum Reduction Cell Gas Collecting System

A lot of harmful smoke is produced in the process of aluminium eleetrolysis. The smoke does great harm to human health, and pollutes the environment. Therefore, the aluminium electrolysis system equipped with a dedicated smoke capture system to collect the harmful smoke, and send it to the purification system. With expanding of the capacity of reduction cell and increace of the cell structure size, the gas-collecting problem becomes more and more serious. So, reforming the smoke capture system and developing a high efficiency gas-collecting hood technology suitable to large-scale aluminum reduction cell become more and more particularly urgent. Based on the analysis of the current flue gas purification technology and its current situation of 320kA aluminum reduction cells, a new set of method is developed to simulate the flue gas flow characteristice in smoke capture system.Results show due to raising the height of collecting hood and smoke duct, the negative pressure between inside and outside of the cover slot is generated, large smoke collecting can be got at low pressure in tentative cell. It not only increase smoke collcting efficiency, but also decrease energy consuming. Raising the height of collecting hood and smoke duct is also helpful to eliminate air leakage caused by the installation of crust breaking system. Improving closeness of cover plate, reducing air leakage points, also help to improve collection efficiency of gas-collecting hood.Field test was conducted, and the test results compared in detailed. Gas temperatures of tentative cell is significantly lower than that of comparative cell, lower flue gas temperature benefit to improve efficiency and enhance the service life of filter bags. And the smoke collcting mass of tetative cell is larger than comparative cell, which shows accurate calculations of the purification system resistance loss is great important to improve smoke collecting efficieny. According to the results reforming programs for 320kA aluminum reduction cell gas system was proposed.