Power generation energy-saving and dedusting method by using multi-level organic Rankine waste heat of smoke in iron alloy furnace

Abstract

A power generation energy-saving and dedusting method by using multi-level organic Rankine waste heat of smoke in an iron alloy furnace is characterized in that the iron alloy furnace smoke is discharged from the interior of a furnace, the cold air is mixed with the smoke through a water cooling smoke duct, after carbon monoxide gas is burnt, and the iron alloy furnace smoke enters into a burning setting chamber and enters into a heat storage temperature-balancing device. After being affected by the heat storing and temperature balancing actions of a cast iron material heat accumulator, the high temperature smoke enters into a waste heat collection chamber to complete heat exchange, the temperature of the smoke is lowered to 120 DEG C, after being dedusted, the smoke is pressed into an exhaust funnel by a main air blower to be discharged into air. Meanwhile, the circulating water is driven by a water pump of a heat exchanger and enters into the heat exchanger arranged in the waste heat collection chamber to absorb the heat of the smoke, and steam-water-mixture is formed. Organic working medium liquid absorbs the heat of the steam-water-mixture, does expansion work in a multi-level organic turbine and drives an electric generator to generate electricity. R236ea is adopted as the circulating organic working medium. The power generation energy-saving and dedusting method by using the multi-level organic Rankine waste heat of the smoke in the iron alloy furnace has the advantages that a 'peak clipping and valley filling' function is achieved, the fluctuation range of the temperature is reduced, the heat energy in the smoke can be recycled to the maximum extent and be converted into high-quality electric energy, and a good environment protection effect is achieved.

Description

technical field [0001] The invention relates to an energy-saving and dust-removing method for multi-stage organic Rankine waste heat power generation of ferroalloy furnace flue gas. Specifically, it can maximize the recovery of the 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 ferroalloy furnace dust removal method. 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 steelmaking flue gas from ferroalloy furnace, the temperature of the flue gas 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 amoun...

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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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