System and method for utilizing residual heat of electrolyzer low temperature flue gas

Abstract

The invention discloses a system and a method for utilizing low-temperature flue gas afterheat of an electrolytic bath. The system mainly comprises a heating system, a cooling system, a dust collecting device and a fume extractor, and utilizes energy cascade utilization, low-temperature afterheat recovery and a heat exchanger to absorb heat by classification from low-grade flue gas for cooling, heating and heat using of technological process. The method includes the following steps: when the low-temperature flue gas afterheat of the electrolytic bath passes through the heat exchanger, the heat exchanger is used for absorbing the heat in the flue gas, and converting the absorbed heat into liquid or steam to utilize, the dust collecting device is used for collecting dust in the flue gas after heat release and temperature reduction, and then the flue gas after dust collection is exhausted by the fume extractor. The invention solves the problem of utilization of the low-temperature flue gas afterheat of the electrolytic bath, realizes continuous supply of cooling and heating, can improve the dust collecting system efficiency of the electrolytic bath, save energy, lower consumption, reduce pollutants discharge, expand utilization ways of afterheat and reduce the production cost of enterprises, and has remarkable economic, environmental and social benefits.

Description

technical field [0001] The present invention relates to a system and method for utilizing the waste heat of low-temperature flue gas in an electrolytic cell, in particular to a low-temperature electrolytic cell that applies low-temperature waste heat recovery technology and absorbs the waste heat of flue gas through a heat exchanger and a heat pump to provide usable cooling and heat. System and method for utilizing waste heat of flue gas. Background technique [0002] At present, the electrolytic cell in the aluminum industry produces a large amount of flue gas during the production process. At the same time, the operation mode of the electrolytic cell causes the sealing of the flue gas system to be poor, and the air leakage system is large and unstable. Therefore, electrolysis flue gas has some salient features: high dust content and can continue to be used as raw materials; large flow and large fluctuations; low temperature and large variation range; low-grade waste heat w...

AI Technical Summary

Problems solved by technology

The existing process system mainly uses chillers for refrigeration and oil-fired boilers for heating, all of which are obtained from high-grade electric energy and diesel oil, resulting in serious waste

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