Power generation method by using waste heat of aluminum electrolysis gas

Abstract

The invention discloses a power generation method by using waste heat of aluminum electrolysis gas and relates to a waste heat utilization method in an aluminum electrolysis production process. The power generation method is characterized in that a recycling process is that a thermoelectric power generation module is arranged on aluminum electrolysis gas pipe, and heat energy in the aluminum electrolysis gas is converted into electric energy to be output and utilized by the thermoelectric power generation module. According to the method disclosed by the invention, waste heat power generation recovery of the aluminum electrolysis gas is realized by utilizing a semiconductor thermoelectric generator technology; on one hand, waste heat reutilization is realized, and the influence of high-temperature flue gas on an aluminum electrolysis high-temperature flue gas purification system is reduced; on the other hand, waste heat power generation of the flue gas is realized, a novel way is provided for further energy conservation and consumption reduction in the aluminum electrolysis industry. The system structure is simple, the original structure of the aluminum electrolysis gas system is not changed, and the system is easy to realize, simple to mount and maintain, pollution-free during operation, zero in mechanical drive and long in service life.

Description

Technical field [0001] A method for generating electricity by using waste heat from aluminum electrolysis flue gas relates to a method for utilizing waste heat in an aluminum electrolysis production process. Background technique [0002] The basic principle of pre-baked anode aluminum electrolysis is that the cryolite-alumina electrolyte melt undergoes an electrochemical reaction between the anode and the anode under the action of a strong direct current. The aluminum ions in the electrolyte get electrons and are precipitated on the cathode to obtain aluminum liquid. The discharge on the anode generates a mixture of carbon monoxide and carbon dioxide. Theoretically, the carbon dioxide produced by producing ton of aluminum during the complete reaction is 3 / 4 of that, but the carbon materials in the tank, especially the carbon anode, will burn and oxidize during the production process. In addition, there is also fluorine in the aluminum electrolysis process. The volatilization or ...

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Problems solved by technology

On the other hand, high-temperature flue gas has a great impact on the purification system, especially the bag filter, which directly affects the operating cost and purification efficiency of the purification system.

In order to reduce the temperature of the flue gas in the industry, the flue gas is generally diluted and cooled by inhaling a large amount of air, but it also increases the flue gas processing capacity and the energy consumption of the fan.

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