Method and device for centralized collection of carbon dioxide in electrolytic aluminum production

Abstract

The invention discloses a method for centralized collection of carbon dioxide in electrolytic aluminum production. And preparation before electrolysis, flue gas pipe burying and carbon dioxide collection are carried out. According to the carbon dioxide centralized collection device in the electrolytic aluminum production, an insulating plate is fixedly installed below a cover plate, a gas collection flue is installed below the insulating plate, the gas collection flue is fixedly connected with the upper end of a flue gas pipe, the side face of the flue gas pipe is fixedly connected with the lower end of a discharging pipe, and the discharging pipe penetrates through the gas collection flue, the insulating plate, the cover plate and a crust breaking air cylinder to be connected with a crust breaking hammer rod. The crust breaking hammer rod penetrates through the gas collecting flue, the insulating plate and the cover plate to be inserted into the flue gas pipe. Carbon dioxide is prevented from being mixed with air, the concentration of the carbon dioxide is greatly improved, the industrial recycling concentration requirement is met, carbon dioxide emission is reduced, the situation that smoke is extracted to take away electrolysis heat is avoided, the heat preservation effect is good, the power of a smoke exhaust fan is greatly reduced, energy consumption is low, and the phenomena of hammer head long package and material blocking of a discharging hole are eliminated.

Description

technical field [0001] The invention belongs to the technical field of electrolytic aluminum, and in particular relates to a method for centrally collecting carbon dioxide in electrolytic aluminum production, as well as the collecting device. Background technique [0002] Electrolytic aluminum production is a major source of carbon dioxide emissions. The electrolytic cell emits about 1.22 tons of carbon dioxide for every ton of aluminum produced. The traditional production process cannot recycle the carbon dioxide generated by electrolytic aluminum. After defluorination, dust removal and desulfurization of flue gas , the flue gas including carbon dioxide is directly discharged into the atmosphere. During the production of the electrolytic cell, aluminum liquid and electrolyte liquid are installed in the furnace, and the anode carbon block is placed on the electrolyte liquid. A closed space surrounded by carbon block, side furnace side, anode carbon block, and furnace surfac...

AI Technical Summary

Problems solved by technology

This solves the problem of flue gas escaping, but a large amount of air is inevitably sucked in, so that the final total amount of flue gas reaches about 100 times that of the original flue gas, which requires a larger power exhaust fan, a large number of When the flue gas is taken away, more heat is taken away, which increases the energy consumption of electrolytic aluminum, while the concentration of carbon dioxide in the flue gas is diluted to about 1%, which loses the value of industrial recovery, causing the flue gas to pass through the purification and desulfurization system , directly discharged into the atmosphere after fluoride adsorption, dust removal, and desulfurization, which is not conducive to energy saving and emission reduction, and is also a waste of carbon dioxide resources

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