Waste heat power generation and dust removal integrated method for flue gas exhausted from metallurgical furnace

Abstract

A waste heat power generation and dust removal integrated method for flue gas exhausted from a metallurgical furnace is characterized in that flue gas in the metallurgical furnace is exhausted through a fourth hole and mixed with cold air through a water-cooling sliding sleeve; after carbon monoxide gas is burnt out, the flue gas enters a settling chamber; the high-temperature flue gas from the settling chamber enters a heat exchange chamber and gives off heat; the cooled flue gas from a booster fan is mixed with flue gas from an external exhaust pipe connected with the upper part of the metallurgical furnace, and then the mixed flue gas enters a dust remover; after dust removal, the mixed flue gas is pressed into an exhaust funnel by a main air blower to be exhausted to the atmosphere. Circulating water is used for absorbing the heat of flue gas through a heat exchanger to form gas-water mixture; the gas-water mixture enters an evaporator and gives off heat. A low-boiling point organic working medium is used for absorbing the heat of the gas-water mixture to become saturated vapor; the saturated vapor enters a vapor pocket and does work in a steam turbine so as to drive a three-phase generator to generate electricity. R123 is adopted as the cycle organic working medium. According to the waste heat power generation and dust removal integrated method, the adopted steam pocket can remove supersaturated moisture and impurities in the flue gas by filtration; heat energy in the flue gas can be converted into high-grade electric energy to the utmost extent.

Description

technical field [0001] The invention relates to a dust removal method for integrated waste heat power generation of exhaust gas inside and outside a metallurgical furnace. Specifically, it can maximize the recovery of heat energy in the flue gas of a metallurgical furnace and convert it into high-grade electric energy, and can improve the dust removal ability, and belongs to the technical field of dust removal for metallurgical furnaces . Background technique [0002] In the prior art, the purification device for the flue gas of the metallurgical furnace is the flue gas generating equipment of the metallurgical furnace, the waste heat utilization facility, and the dust collector are connected in sequence through pipelines. [0003] At present, waste heat utilization facilities are commonly used: water tube waste heat boilers, regenerative waste heat boilers to recover the waste heat of metallurgical furnace flue gas, and generate saturated steam, etc. Because the flue gas t...

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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 system, resulting in the situation of large horses and small carts

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