High-temperature flue gas waste heat recovery and advanced purification system

Abstract

The invention discloses a high-temperature flue gas waste heat recovery and advanced purification system. The system comprises a waste heat recovery module, a power generation module, an organic Rankine cycle heat exchanger and a dust removal purification module, wherein the gas inlet end of the waste heat recovery module is connected with a high-temperature flue gas inlet, the gas outlet end of the waste heat recovery module is connected with the dust removal purification module, two sets of tube type heat exchangers in different arrangement directions are arranged in the waste heat recovery module, a heat-exchange medium pipe outlet inside the waste heat recovery module is connected with the power generation module, the power generation module and the organic Rankine cycle heat exchanger are connected in series, and steam output through the organic Rankine cycle heat exchanger is subjected to refluxing through a condenser, passes through a working medium separator and then is connected to the waste heat recovery module and a heat exchange medium pipe inlet of the organic Rankine cycle heat exchanger. According to the high-temperature flue gas waste heat recovery and advanced purification system, a water working medium and an organic working medium are adopted and combined with electrolyzed high-temperature flue gas for three-time heat exchange, the purpose of utilizing heat of high-temperature flue gas to the maximum extent is achieved, the dust removal purification module is adopted for conducting advanced purification on cooled flue gas, energy conservation and emission reduction are achieved, and the economic benefit of enterprise production is improved.

Description

technical field [0001] The invention belongs to the technical field of waste heat utilization and purification of aluminum electrolysis flue gas, and specifically relates to a high-temperature flue gas waste heat recovery and deep purification system. Background technique [0002] During the aluminum electrolysis production process, only 40% to 45% of the input electric energy is used to participate in the electrolytic reaction to form aluminum, and the heat taken away by the flue gas accounts for 10% of the heat loss of the entire tank system (total energy minus the electric energy of the electrochemical reaction) 40% to 60%. Therefore, recycling the energy taken away by the flue gas is of great significance to reduce the energy consumption per ton of aluminum in aluminum electrolysis enterprises and improve the economic benefits of enterprises. [0003] At present, in the production process of electrolytic aluminum, the electrolytic cell continuously produces anode gas, a...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method that can fully and effectively utilize the heat of the high-temperature flue gas to generate electricity and process the low-temperature flue gas after recovering heat, aiming at the defect of low waste heat utilization rate in the existing aluminum electrolysis high-temperature flue gas. The deep purification device achieves the purpose of energy saving, emission reduction and production cost reduction

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