Electric furnace high-temperature alternating flue gas waste heat power-generation energy-conservation and dust-removal method

Abstract

Provided is an electric furnace high-temperature alternating flue gas waste heat power-generation energy-conservation and dust-removal method. The method is characterized in that electric furnace flue gas is exhausted from a fourth hole, cold air is mixed into the electric furnace flue gas through a water-cooled sliding sleeve, after carbon monoxide gas is combusted, the mixture of the electric furnace flue gas and the cold air enters a settling chamber, then enters a thermal storage temperature evening device for temperature evening and enters a heat pipe evaporator, steam is generated and then enters a bag-type dust remover, after dust removal is carried out, the steam enters a medium and low temperature flow equalizing thermal storage chamber, and the flue gas emits heat and is pressed into an exhaust funnel through a main air blower to be exhausted to atmosphere; meanwhile, circulating water absorbs the heat of the flue gas from a heat exchanger, so that a steam-water mixture is formed and enters the evaporator, heat is given off, low boiling point organic working media absorb the heat of the steam-water mixture in the evaporator through a working medium pump to become saturated steam, and working medium steam does work in a low boiling point working medium steam turbine in an expansion mode and drives a three-phase generator to generate electricity; R245fa is adopted to serve as the circulating organic working media. According to the method, heat in the flue gas can be recycled to be converted into high-grade electric energy to the maximum degree, the dust removal capacity can be improved, and a good environment protection effect is achieved.

Description

technical field

[0001] The invention relates to an energy-saving and dust-removing method for electric furnace high-temperature alternating flue gas waste heat power generation. Specifically, the method can maximize the recovery of heat energy in the flue gas and convert it into high-grade electric energy, and can improve the dust-removing ability, and belongs to the technical field of electric furnace dust-removal. Background technique

[0002] The iron and steel industry consumes a large amount of energy every year, and the high-temperature flue gas generated during the smelting process and the heat dissipation of equipment take away a large amount of energy. Due to the high temperature of the electric furnace steelmaking flue gas, the temperature entering the pipeline after being captured is generally around 1250°C, and the dust concentration reaches 18g / Nm 3 , the ash less than 8um accounts for more than 75% of the total amount of dust, the amount of dust is large, and i...

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