Aluminum electrolytic cell closed gas collecting device

Abstract

The invention discloses an aluminum electrolytic cell closed gas collecting device. At least two electrolytic chambers are formed inside an aluminum electrolytic cell through an anode and a cathode; the anode is a self-baking anode, and an anode paste discharging system is arranged above the anode; three groups of flue gas gathering pipelines are arranged on the aluminum electrolytic cell, the first-stage flue gas gathering pipeline directly communicates with an inner space of a cell body, the second-stage flue gas gathering pipeline extends to the position, above the anode, inside the cell body, and the third-stage flue gas gathering pipeline extends into the cell body and is in butt joint with an anode paste feeding port in the top of the self-baking anode through the anode paste discharging system; and the aluminum electrolytic cell is provided with a two layers of sealing structures including the outer sealing structure and the inner sealing structure. By means of the aluminum electrolytic cell closed gas collecting device, the centralized treatment and recovery of the exhaust gas and the waste heat generated by the aluminum electrolytic cell adopting the multiple continuous operation chambers are realized, the ultra-low controllable discharge of air pollutant in the electrolytic cell is realized, the heat preservation state of the electrolytic cell is improved, the heat loss of the electrolytic cell is reduced, and the energy efficiency level of the electrolytic cell is effectively increased.

Description

technical field [0001] The invention belongs to the aluminum electrolytic cell technology, and in particular relates to a closed gas collection system for an aluminum electrolytic cell. Background technique [0002] At present, electrolytic aluminum is produced by prebaked anodes, and the electrolytic flue gas generated is mainly the anode gas in the electrolysis process, so the measures of closed gas collection and centralized purification are often used for treatment. However, the effect of gas collection and purification is poor, mainly due to the fact that the cover plate of the current electrolytic cell is not tightly sealed, and there is more air leakage. What is more serious is that each cell has a long-term (0.5-1 hour) pole-changing operation every day. When the tank cover is fully open, a large amount of air leaks into the electrolytic tank, resulting in more than 90% of the flue gas composition in the electrolytic tank being mixed air, and the rest is the anode ga...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: aiming at the defect that the waste gas collection efficiency of the existing aluminum electrolytic cell is not high and the aluminum electrolytic cell is not environmentally friendly, to provide a kind of energy-saving, consumption-reducing, sealing and heat preservation, and improving the gas collection efficiency of the electrolytic cell. Airtight gas collection device for aluminum electrolytic cell with uniform and fast gas

Images