Regenerative submerged arc furnace flue gas waste heat power generation method

Abstract

The invention discloses a regenerative submerged arc furnace flue gas waste heat power generation method. The method is characterized by comprising the following steps that flue gases of a submerged arc furnace are exhausted from the furnace, sequentially enter a combustion sedimentation chamber, a heat accumulation temperature equalizing device and a waste heat collection chamber after being mixed with cold air through a water-cooled sliding sleeve, give off heat, enter a bag-type dust collector, and are pressed into an exhaust funnel and exhausted into the atmosphere after being subjected to bag removal; meanwhile, circulating water enters a heat exchanger to absorb the heat of the flue gases to form a steam-water mixture, and the steam-water mixture enters an evaporator, and gives off heat; and an organic working medium absorbs the heat in the evaporator through a working medium pump to form steam, and the working medium steam is expanded to apply work in a steam turbine to drive a generator to generate power. The method is characterized in that R236ea is adopted as the circulating organic working medium. Due to the adoption of the heat accumulation temperature equalizing device, the fluctuation amplitude and a peak value of the flue gases are reduced; and heat energy is converted into high-quality electrical energy, so that a device is low in investment and low in running energy consumption, and has a good environmental protection effect, and influence on the production stability and continuity of the submerged arc furnace is avoided.

Description

technical field [0001] The invention relates to a waste heat power generation method for flue gas of a submerged arc furnace. 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, and belongs to the technical field of dust removal for submerged arc furnaces. 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 flue gas from submerged arc furnace steelmaking, the temperature entering the pipeline after being captured is generally around 950°C, and the dust concentration reaches 22g / Nm 3 , the ash less than 6um accounts for more than 72% of the total amount of dust, the amount of dust is large, and it is sticky and fine. Moreover, the flue ...

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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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