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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Problems solved by technology

However, the actual steam output is far lower than the maximum evaporation capacity of the waste heat recovery device, resulting in the situation of large horses and small carts

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