化工学报2017，Vol.68Issue(11)：4261-4271,11.DOI:10.11949/j.issn.0438-1157.20170345
湿法脱硫装置对燃煤锅炉PM2.5排放特征的影响
Influence of wet flue gas desulfurization devices on PM2.5 emission characteristics of coal-fired boilers
摘要
Abstract
In this paper, a two-stage dilution sampling method was applied to collect PM2.5 in flue gas before and after the WFGDs in a utility pulverized coal boiler, a utility CFB boiler and an industrial grate-fired boiler, respectively. PSDs (particle size distributions) of PM2.5 number and mass concentrations were analyzed by ELPI (electrical low pressure impactor), microstructures of PM2.5 were analyzed by SEM (scanning electron microscopy), and the contents of minor and tract elements and water-soluble ions in PM2.5 were analyzed by XRF (X-ray fluorescence), ICP-OES (inductively coupled plasma optical emission spectroscopy) and IC (ion chromatography), respectively. The results showed that the mass concentrations of PM2.5 generated from the pulverized coal boiler and the CFB boiler after desulfurization were higher than those before desulfurization, but the mass concentrations of PM2.5 generated from the pulverized coal boiler and the CFB boiler after desulfurization were lower than those before desulfurization. There existed blocky, layered and finely columnar microstructures on the surfaces of PM2.5 after the WFGDs, and several particles belonging to PM2.5 were the agglomerates consisting of fine spherical particles. The attachment of the slurry composition and the desulfurization product will cause a significant change in the appearance of the PM2.5. After desulfurization, the contents of Ca, S and Ca2+ and SO42? in PM2.5 were significantly increased due to the participation of desulfurization slurry, while the contents of Si and Al decreased. The As, Se and Hg in the flue gas will also undergo different chemical changes to enter PM2.5. During the wet desulfurization process the slurry can trap particles in the flue gas, but the desulfurization slurry composition and desulfurization products will be dried to form particles or be collocated with the original particles to form new ones.关键词
WFGD/PM2.5/粒径分布/显微结构/痕量元素Key words
WFGD/PM2.5/particle size distribution/microstructure/trace elements分类
资源环境引用本文复制引用
赵志锋,徐力,赵来福,杜谦,董鹤鸣,苏利鹏,赵广播,吕东辉,王敏,高建民,郭馨..湿法脱硫装置对燃煤锅炉PM2.5排放特征的影响[J].化工学报,2017,68(11):4261-4271,11.基金项目
国家自然科学基金项目(jj20160337) （jj20160337）
国家环保公益性行业科研经费专项项目( 201009006 ) （ 201009006 ）
国家科技支撑项目(2014BAA07B03) （2014BAA07B03）
创新研究群体科学基金项目(51421063). supported by the National Natural Science Foundation of China(jj20160337), Special Fund for National Environmental Protection Public Welfare Industries of China (201009006), the National Science and Technology Support Project (2014BAA07B03) and Science Foundation for Innovative Research Groups (51421063). （51421063）
