Experimental Study on Removal Effect of Wet Flue Gas Desulfurization System on Fine Particles From a Coal-fired Power Plant
Experimental Study on Removal Effect of Wet Flue Gas Desulfurization System on Fine Particles From a Coal-fired Power Plant
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发表时间：
2008
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影响因子：
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通讯作者：
Chen Changhe
中科院分区：
文献类型：
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作者：
Chen Changhe
Fly-ash particles from the inlet and outlet of the wet flue gas desulphurization(WFGD) system in a 300 MW coal-fired power plant were sampled by an Andersen 8-stage impactor and the mass concentrations and size distributions of fly-ash particles in flue gas were obtained. The samplings were developed under 100% and 70% boiler loads. The microstructure, major and minor-element concentrations of particles were measured using field emission scanning electron microscopy/energy dispersive X-ray spectrometry(FESEM- EDS), X-ray fluorescence(XRF) and inductively coupled plasma - atomic emission spectrometry (ICP-AES), respectively. The results indicate that the mass size distribution of fly-ash particles in the inlet of the WFGD system is typically disturbed bimodally, the peaks are approximate at 1 and 3 μm. And the shape of particles is regular sphericity, the mass ratio of PM2.5 to PM10 is about 0.434. The total mass concentration is about 85 mg/m3. In the outlet of the WFGD system, the mass size distribution of fly-ash particles is also bimodal. The proportion of fine particles increased, the mass ratio of PM2.5 to PM10 is about 0.764. Some fine particles are conglutinated and formed irregular agglomerate. The total mass concentration is under 23 mg/m3, the removal efficiency of total particles is 74.5%. The size removal efficiency is decreased observably with the range of particle size decreasing. After the WFGD system, the element concentrations of S and Ca in fine particles are augmented, and the concentrations of Al, Ba, Fe, Mn and Si are decreased oppositely. Fine particles in the outlet of WFGD system consist of about 47.5% limestone and 7.9% gypsum particulate matters.
