Organic Rankine waste heat power generation method for flue gas frommetallurgical furnace

Abstract

The invention discloses an organic Rankine waste heat power generation method for flue gas from a metallurgical furnace. The organic Rankine waste heat power generation method is characterized in that the flue gas from the metallurgical furnace is exhausted from a fourth hole and is mixed with cold air through a water-cooled sliding sleeve; mixed gases enter a settling chamber and then enter a sinter board dust catcher; the mixed gases subjected to dust collecting enter a regenerative temperature regulator; under the regenerative temperature regulating action, flue gas enters a current-sharing heat exchange chamber; high-temperature gas releases the heat and then heat exchange is finished; the flue gas is pressed in an exhaust funnel and then is exhausted in the atmosphere; meanwhile, circulating water absorbs heat of the flue gas from the heat exchanger to form steam-water mixture; the steam-water mixture enters an evaporator and releases the heat; organic working medium liquid absorbs the heat of the steam-water mixer to become working medium steam; the working medium steam expands in an organic turbine with a steam replenishing opening to do work and drives a power generator to generate power. The organic Rankine waste heat power generation method is characterized in that R227ea is adopted as a circulating organic working medium. According to the method disclosed by the invention, heat energy in the flue gas can be recovered to the maximum extent and is directly converted into high-grade electric energy; compared with a single-stage evaporation organic Rankine cycle mode, the method has the advantages that heat efficiency is improved by 23-28 percent, and a good environment-friendly effect is obtained.

Description

technical field [0001] The invention relates to a metallurgical furnace flue gas organic Rankine waste heat power generation method. Specifically, the heat energy in the flue gas can be recovered to the greatest extent and converted into high-grade electric energy, and the dust removal ability can be improved, belonging 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. Moreover, the...

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