Dedusting method using residual heat from flue gas of fully-closed electric furnace

Abstract

The invention discloses a dedusting method using residual heat from flue gas of a fully-closed electric furnace. The dedusting method is characterized in that internally-exhausted flue gas of the electric furnace is exhausted through a fourth hole, and cold air is mixed in through a water-cooling sliding sleeve to enter a settling chamber; the flue gas enters a cyclone dust collector for pre-dedusting; then the flue gas enters a flow equalization regenerative chamber, the high temperature flue gas gives out heat, and when the temperature drops to 80 DEG C, the cooled flue gas comes from a booster fan to be mixed with flue gas from an external pipeline connected above the electric furnace to enter a sinter board dust catcher together, and the flue gas is pressed into an exhaust funnel by a main air blower to be injected into the atmosphere after dedusting; and meanwhile, organic working medium liquid absorbs the heat of flue gas residual heat carrier in a low pressure level evaporator, an intermediate pressure level evaporator and a high pressure level evaporator to be turned into working medium steam, the steam does work by expansion in an organic turbine with a steam adding opening, and accordingly an electric generator is driven to generate electricity. The dedusting method has the characteristic that R600a is used as a circulation organic working medium. By the adoption of the method, heat energy in the flue gas can be recovered to the maximum degree to be converted into high-grade electric energy directly, and therefore the environmental protection effect is good.

Description

technical field [0001] The invention relates to a method for dust removal by utilizing the residual heat of flue gas of a fully enclosed electric furnace, specifically capable of maximally recovering heat energy in flue gas and converting it into high-grade electric energy, and improving dust removal ability, belonging to the technical field of dust removal for electric furnaces. Background technique [0002] In the prior art, the purification device for the electric furnace flue gas is the electric furnace flue gas generating equipment, the waste heat utilization facility, and the plastic-fired plate dust collector 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 waste heat from electric furnace flue gas, and generate saturated steam, etc. Because the flue gas temperature fluctuates sharply and the dust content is large, it is difficult...

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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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