Metallurgical furnace exhaust gas multistage organic Rankine waste heat power generation energy-saving dedusting method

Abstract

The invention provides a metallurgical furnace exhaust gas multistage organic Rankine waste heat power generation energy-saving dedusting method. The method is characterized in that exhaust gas in a metallurgical furnace is discharged from a fourth hole, is mixed with cold air through a water cooling sliding sleeve, enters a combustion settling chamber after carbonic oxide gas is burnt, and then enters a waste heat exchange chamber and finally completes heat exchange. When the temperature of the exhaust gas drops to 120 DEG C, the exhaust gas enters a dust remover, then is subjected to dedusting, is pressed into an exhaust funnel through a main air blower and finally is discharged into atmosphere. Meanwhile, circulating water is driven through a feed water pump of a heat exchanger to flow into a heat exchanger arranged in the waste heat exchange chamber to absorb heat in the exhaust gas, and then steam-water mixture is formed. Organic working medium liquid absorbs the heat of the steam-water mixture, and does work in a multistage organic turbine in an expanding mode to drive a generator to generate electricity. The method is further characterized in that R124 refrigerant is used as the circulating organic working medium. The metallurgical furnace exhaust gas multistage organic Rankine waste heat power generation energy-saving dedusting method is capable of recovering heat energy in the exhaust gas to the maximum extent and directly converting the heat energy to high-grade electric energy. The efficiency through the method is improved by 10-20% more than the efficiency through a single-stage organic Rankine evaporating method. Moreover, the method has good environment-friendly effects.

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 metallurgical furnace flue gas. 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, belonging to metallurgical furnace dust removal. technology field. Background technique [0002] In the prior art, the purification device for the flue gas of the metallurgical furnace is the flue gas generating equipment of the metallurgical furnace, the waste heat utilization facility, and the dust collector are connected in sequence through pipelines. [0003] At present, waste heat utilization facilities are commonly used: water tube waste heat boilers, regenerative waste heat boilers to recover the waste heat of metallurgical furnace flue gas, and generate saturated steam, etc. Because the flue gas temperature of metallurgical...

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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 system, resulting in the situation of large horses and small carts

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