Cupola furnace flue gas organic Rankine waste heat power generation method

Abstract

The invention discloses a cupola furnace flue gas organic Rankine waste heat power generation method. The method is characterized in that flue gas of a cupola furnace is exhausted from the cupola furnace, and is mixed with cold air through a water-cooled flue, the mixture enters a settling chamber, a heat storage temperature equalizer, a high-temperature heat pipe evaporator and an equal-current waste heat exchange chamber after carbon monoxide is combusted, heat is released, the cooled flue gas enters a plastic burning board dust remover, is pressed into an exhaust funnel through a main fan after dust is removed, and is exhausted into the atmosphere, circulating water absorbing the heat of the flue gas from a heat exchanger is converted into a steam-water mixture, heat is released, organic working medium liquid absorbing the heat of a flue gas waste heat carrier in a low-pressure evaporator, a medium-pressure evaporator and a high-pressure evaporator is converted into working medium steam, and the working medium steam is expanded to apply work to drive a generator to generate power in an organic turbine with a steam supplementing port. The method is characterized in that R141B is adopted as a circulating organic working medium. According to the method, heat in the flue gas can be maximally recovered, and can be directly converted into high-quality power, dust removal capability can also be improved, and good environmental protection effects are achieved.

Description

technical field [0001] The invention relates to a method for power generation by organic Rankine waste heat of cupola 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. It belongs to cupola waste heat utilization and dust removal 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 the cupola steelmaking flue gas, the temperature entering the pipeline is generally around 650°C, and the dust concentration reaches 18g / Nm 3 , the ash less than 8um accounts for more than 75% of the total amount of dust, the amount of dust is large, and it is sticky and fine. Moreover, the temperature of the flue gas fluctuates viol...

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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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