Smoke waste heat power generation energy-saving dust removing method for metallurgical furnace

Abstract

Provided is a smoke waste heat power generation energy-saving dust removing method for a metallurgical furnace. The smoke waste heat power generation energy-saving dust removing method for the metallurgical furnace is characterized in that smoke of the metallurgical furnace is exhausted from a fourth hole, cold air is mixed in the smoke after the smoke passes through a water-cooled sliding sleeve, the smoke enters a settling chamber, enters a sinter board dust catcher, and enters a heat accumulation temperature equalizing device after dust removing, the smoke enters a flow equalizing heat exchanging chamber through the action of heat accumulation temperature equalizing, high-temperature smoke emits heat, heat exchange is completed, and the smoke is pressed into an exhaust funnel and exhausted into the atmosphere. Meanwhile, circulating water absorbs heat of the smoke form a heat exchanger to form a steam-water mixture which enters an evaporator and release heat, and organic working medium liquid absorbs heat of the steam-water mixture, turns into work medium steam, expands to do work in an organic turbine with a steam supplementing opening and drives a generator to generate electricity. The smoke waste heat power generation energy-saving dust removing method for the metallurgical furnace is characterized in that R227ea is adopted as the circulation organic work medium. According to the method, heat energy in smoke can be recovered to the maximum extent to be directly converted into high-grade electric energy, the heat efficiency of the method is improved by 23-28% than 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 waste heat generation of metallurgical furnace flue gas. 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 metallurgical furnace dust-removal. 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 metallurgical furnaces, the temperature entering the pipeline after capture is generally around 1200°C, and the dust concentration reaches 25g / Nm 3 , the ash less than 5um accounts for more than 70% of the total amount of dust, the amount of dust is large, and it is sticky and fine. ...

AI Technical Summary

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

Images