Flue gas waste heat power-generation energy-conservation and dust-removal method for electric furnace with liquid storage tank

Abstract

Provided is a flue gas waste heat power-generation energy-conservation and dust-removal method for an electric furnace with a liquid storage tank. The method is characterized in that flue gas of the electric furnace is exhausted from the inside of the electric furnace, the flue gas is mixed into cold air through a water-cooled flue gas to enter a settling chamber, the flue gas passing the settling chamber enters a high-temperature dust remover which is a filter element dust remover made of high temperature resistance carbon and copper composite materials, and then enters a thermal storage temperature evening device, after thermal storage and temperature evening are carried out on the flue gas, the flue gas enters a collection chamber and emits heat, the flue gas is pressed into an exhaust funnel through a main fan and exhausted to atmosphere, meanwhile, circulating water flows into a heat exchanger and absorbs the heat of the flue gas, a steam-water mixture is formed and enters an evaporator, heat is given off, organic working media absorb the heat in the evaporator through a working medium pump to become steam and enter a steam drum, and the steam does work in a steam turbine in an expansion mode and drives a generator to generate electricity; R227ea is adopted to serve as the circulating organic working media. The working medium liquid storage tank is adopted, so that it is guaranteed that the working medium circulating pump can continuously pressurize, heat energy is converted into high-grade electric energy through organic Rankine cycle waste heat power generation, investment of the device is little, and running energy consumption is low.

Description

technical field [0001] The invention relates to an energy-saving dust removal method for electric furnace flue gas waste heat power generation with a liquid storage tank. Specifically, it can maximize the recovery of heat energy in the flue gas and convert it into high-grade electric energy, and can improve the dust removal ability. It belongs to the electric furnace dust removal technology field. 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 flue gas, the temperature entering the pipeline after being captured is generally around 900°C, and the dust concentration reaches 35g / Nm 3 , The ash less than 5um accounts for more than 80% of the total amount of dust, the amount of dust is large, and it is sticky and fine. Moreover...

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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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