Energy-saving dust removing method for smoke of metallurgical semi-airtight electric furnace

Abstract

The invention discloses an energy-saving dust removing method for smoke of a metallurgical semi-airtight electric furnace. The method is characterized in that the internal exhaust smoke of the semi-airtight electric furnace is exhausted out from a fourth hole, is mixed into cold air through a water-cooling sliding sleeve and enters a settling chamber, the smoke exhausted by the burning settling chamber is mixed with smoke exhausted through an external exhaust pipeline connected to the upper portion of the electric furnace, and the mixed smoke enters a waste heat exchange chamber; heat of the high-temperature smoke is released, the cooled smoke enters a sinter-plate dust remover and is exhausted into the atmosphere by being pressed into an exhaust funnel through a main fan after dust removal; and meanwhile, an organic liquid working medium absorbs heat of smoke waste heat carriers in a low-pressure stage evaporator and a high-pressure stage evaporator to become working medium steam which works in an organic turbine with a steam supplementary port in an expanding mode and drives a power generator to generate power, and R290 is adopted as the circulating organic working medium. According to the method, heat energy in the smoke can be recovered to the greatest extent and directly converted into high-grade electric energy, the heat efficiency of the smoke is improved by 31-36% compared with a single-stage evaporation organic Rankine cycle, and the environment protection effect is good.

Description

technical field [0001] The invention relates to an energy-saving and dust-removing method for flue gas of a metallurgical semi-closed electric furnace. 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 dust-removal for semi-closed electric furnaces. Background technique [0002] At present, waste heat utilization facilities are commonly used: water tube waste heat boilers, regenerative waste heat boilers to recover waste heat from semi-closed electric furnace flue gas, and generate saturated steam, etc. Because the flue gas temperature of the semi-hermetic electric furnace fluctuates violently and the dust content is large, it is difficult for the ordinary water tube waste heat boiler to be used for the waste heat recovery of the flue gas of the semi-hermetic electric furnace. At present, the regenerative waste heat ...

AI Technical Summary

Problems solved by technology

Due to the drastic fluctuations in the flue gas temperature of the semi-closed electric furnace and the large amount of dust, it is difficult for ordinary water tube waste heat boilers to be used in the waste heat recovery of the flue gas of the semi-closed electric furnace

At present, the regenerative waste heat boiler has been successfully applied to the waste heat recovery of semi-closed electric furnace flue gas. The popularization of boilers in the steel industry still faces many problems

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