Flue Gas Dehumidification Technology for On-line Monitoring of Ultra-Low Emission Particulate Matter in Coal-Fired Power Plants

doi:10.11930/j.issn.1004-9649.201907053

Abstract

Abstract: Light scattering method is often used in the on-line monitoring of ultra-low emission particle concentration in coal-fired power plants, but its accuracy may be affected by the relative humidity, water droplets, vapor mist and so on. In this paper, the relationship between the measurement error of light scattering method and the relative humidity was found out through the experiment with HJ836-2017 "weight method for the determination of waste gas and low concentration particulate matter of fixed pollution source" as the reference standard. In order to reduce the relative temperature, water droplets and vapor mist of the flue gas to be measured, the application of swirl heater and straight tube heater were explored. The experimental results show that: when the relative humidity is less than 55%, the measurement error of particle concentration can be ignored; under the same power consumption, the heating efficiency of swirl heater is 30% higher than that of straight tube heater; in order to meet the ultra-low emission requirements of coal-fired power plant and improve the reliability of on-line monitoring of particles, the temperature of swirl heating used in flue gas pretreatment should be kept no lower than 120 ℃.

Key words: coal fired power plants, ultra low emission, particle detection, flue gas dehumidification, swirling heating

CLC Number:

X513

LI Dewen, JIAO Min, ZHENG Lei. Flue Gas Dehumidification Technology for On-line Monitoring of Ultra-Low Emission Particulate Matter in Coal-Fired Power Plants[J]. Electric Power, 2019, 52(12): 154-159.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201907053

https://www.electricpower.com.cn/EN/Y2019/V52/I12/154

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