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Integral electric bag composite dust collector and dust removal method for purifying coal-fired flue gas

An electric bag compound and electrostatic precipitator technology, which is applied in the field of pollutant purification, can solve the problems of being easily entrained and entered by flue gas, and achieve the effects of good adaptability, solving selectivity and improving dust removal efficiency.

Active Publication Date: 2018-04-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cooling medium is sprayed out through the nozzle, which is easily entrained by the flue gas and enters the subsequent pollutant control device

Method used

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  • Integral electric bag composite dust collector and dust removal method for purifying coal-fired flue gas
  • Integral electric bag composite dust collector and dust removal method for purifying coal-fired flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] An integral electric bag composite dust collector such as figure 1 As shown, the integral electric bag composite dust collector includes an air intake section 1, two sets of low-temperature tubular heat exchangers 2, an air distribution plate 3, an electric dust collector 4 and a bag filter 5. The electrostatic precipitator 4 and the bag filter 5 are arranged in series, the inlet section 1 is connected to the electrostatic precipitator 4 through the air distribution plate 3, and two sets of low-temperature tubular heat exchangers 2 are installed in the inlet section 1 in parallel. The lower parts of the electrostatic precipitator 4 and the bag filter 5 are respectively provided with an ash hopper 6 , and the upper part of the bag filter 5 is provided with a purified gas outlet chamber. The heat exchange tubes 7 of the cryogenic tube heat exchanger 2 are vertically arranged in the intake section 1, such as figure 2 shown. The material of the low-temperature tubular he...

Embodiment 2

[0073] Utilize the integral type electric bag compound dust collector described in embodiment 1 to purify coal-fired flue gas, the temperature of described coal-fired flue gas is about 145 ℃, SO 3 Content about 10mg / m 3 , The dust concentration is about 10g / m 3 .

[0074] The purification process is as follows: the coal-fired flue gas enters the intake section 1, and the temperature of the flue gas is reduced to 105-110°C by contacting and exchanging heat with the three-stage low-temperature tubular heat exchanger 2 whose heat exchange medium is condensed water. 3 Condensation of about 68wt%; then through the air distribution plate 3 to make the flue gas evenly enter the described electrostatic precipitator 4, the flow velocity of the flue gas in the electrostatic precipitator 4 is 0.8m / s, the residence time is 3s, and about 82% of the gas is collected Total particles; finally enter the bag filter 5, the flue gas is filtered at a wind speed of 0.8m / min on the surface of the ...

Embodiment 3

[0076] Utilize the integral type electric bag compound dust collector described in embodiment 1 to purify coal-fired flue gas, the temperature of described coal-fired flue gas is about 140 ℃, SO 3 Content about 80mg / m 3 , Dust concentration is about 60g / m 3 .

[0077] The purification process is as follows: the coal-fired flue gas enters the intake section 1, and the temperature of the flue gas is reduced to 105-110°C by contacting and exchanging heat with the three-stage low-temperature tubular heat exchanger 2 whose heat exchange medium is condensed water. 3 Condensate about 69wt%; Make flue gas evenly enter described electric precipitator 4 through air distribution plate 3 again, the flow velocity of flue gas in electric precipitator 4 is 1m / s, and residence time is 1s, collects about 84% total Particles; finally enter the bag filter 5, the flue gas is filtered at a wind speed of 2m / min on the surface of the filter bag of the bag filter 5, and the residence time inside th...

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PUM

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Abstract

The invention provides an integral-type electric bag composite dust remover for purifying coal-fired flue gas and a dust removal method. The composite dust remover comprises an electric dust remover, a bag dust remover and tubular heat exchangers, one end of the electric dust remover is communicated with the bag dust remover, the other end of the electric dust remover is communicated with an air inlet section, and the heat exchangers are installed in the air inlet section. According to the composite dust remover, the space is saved; dust and SO3 in the flue gas can be cooperatively removed, the dust removal efficiency is effectively improved, the dust emission concentration is lower than 10 mg / m<3>, and the SO3 removal efficiency is about 70%; heat exchange media in the tubular heat exchangers have no influence on the flue gas components, and therefore not only can the emitted flue gas reach the ultra-low emission standard, but also corrosion of wet flue gas to a chimney can be reduced or waste heat recovery is achieved; the adaptability to different coal types is good; the problems that the selectivity of a low-temperature electric dust remover to the dust-sulfur ratio is high, back coronae and reentrainment of dust occur, and the PM2.5 collection efficiency is low are solved.

Description

technical field [0001] The invention belongs to the technical field of pollutant purification, and relates to an integral electric bag composite dust collector and a dust removal method for purifying coal-fired flue gas. Background technique [0002] The electrostatic precipitator technology is not effective in collecting dust with high specific resistance and fine particle size. Researchers and engineers install low-temperature or low-temperature heat exchangers at the front of the electrostatic precipitator to reduce the temperature of the flue gas, which can reduce the temperature of the flue gas. volume, so that part of the SO in the flue gas 3 Condensate and adsorb on the dust surface to achieve the purpose of reducing the specific resistance of the dust. At the same time, due to the reduction of the volume of the flue gas and the increase of the dust concentration, the particle coagulation due to collision is more likely to occur, and the fine particles can be condense...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D50/00
CPCB01D50/00
Inventor 朱廷钰王雪
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI