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Semi-closed electric furnace flue gas multi-stage organic Rankine cycle waste heat power generation method

A waste heat power generation and Rankine cycle technology, applied in machines/engines, furnaces, waste heat treatment, etc., can solve the problems of large horse-drawn trolleys and low steam output, and achieve lower emission temperature, lower operating energy consumption, lower investment and The effect of running costs

Inactive Publication Date: 2015-02-11
无锡市东优环保科技有限公司
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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

Method used

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  • Semi-closed electric furnace flue gas multi-stage organic Rankine cycle waste heat power generation method
  • Semi-closed electric furnace flue gas multi-stage organic Rankine cycle waste heat power generation method
  • Semi-closed electric furnace flue gas multi-stage organic Rankine cycle waste heat power generation method

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the present invention will be further described:

[0020] Such as figure 1 Shown: the steps of the method for power generation by waste heat of semi-closed electric furnace flue gas multi-stage organic Rankine cycle are as follows:

[0021] 50t / h steelmaking semi-hermetic electric furnace 1 exhaust gas flow rate 18×10 4 N m 3 / h, temperature 1000℃, dust concentration 25g / Nm 3 It is discharged from the fourth hole, mixed with cold air through the water-cooled sliding sleeve 2, and enters the combustion settling chamber 3 after burning carbon monoxide gas; Mixed with cold air, the carbon monoxide gas is finally burned, and the flue gas passing through the combustion settling chamber 3 enters the waste heat exchange chamber 5. The high-temperature flue gas releases heat, and the temperature drops to 80°C. The cooled flue gas comes out from the booster fan 9 and is connected to the The flue gas from the exhaust pipe 4 abov...

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Abstract

The invention discloses a semi-closed electric furnace flue gas multi-stage organic Rankine cycle waste heat power generation method. The method is characterized in that flue gas in a semi-closed electric furnace is exhausted through a fourth hole, and is mixed with cold air through a water-cooled sliding sleeve, the mixture enters a settling chamber and a waste heat exchange chamber, heat is released by high-temperature flue gas, cooled flue gas is exhausted through a booster fan, and is mixed with flue gas discharged from an external discharge pipeline connected above the electric furnace, the mixed 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, 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 opening. The method is characterized in that R290 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, the thermal efficiency is improved by 31 to 36 percent compared with that of a single-stage evaporation organic Rankine cycle method, and good environmental protection effects are achieved.

Description

technical field [0001] The invention relates to a multi-stage organic Rankine cycle waste heat power generation method for flue gas of a semi-closed electric furnace. 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. It belongs to a semi-closed electric furnace Dust removal technology field. Background technique [0002] In the prior art, the purification device for the flue gas of the semi-hermetic electric furnace is the flue gas generating equipment of the semi-hermetic electric furnace, the waste heat utilization facility, and the dust collector are sequentially connected through pipelines. [0003] At present, waste heat utilization facilities are commonly used: water tube waste heat boilers, regenerative waste heat boilers to recover waste heat from semi-closed electric furnace flue gas, and generate saturated steam, etc. Because the flue ga...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00F01K27/00
CPCY02P10/25
Inventor 王正新
Owner 无锡市东优环保科技有限公司
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