燃煤烟气中可凝结颗粒物测试方法评估  

Evaluation of Sampling and Analytical Methods for Condensable Particulate Matter in Flue Gas during Coal Combustion

作　　者：彭越[1] 汪涛[1] 王家伟[1] 张永生[1] 潘伟平[1] PENG Yue;WANG Tao;WANG Jiawei;ZHANG Yongsheng;PAN Weiping(Key Laboratory of Condition Monitoring and Control of Power Plant Equipment Attached to Ministry of Education,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《华北电力大学学报（自然科学版）》2021年第3期117-126,共10页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家重点研发计划项目(2018YFB0605200)

摘　　要：燃煤电厂总颗粒物(TPM)包含可过滤颗粒物(FPM)和可凝结颗粒物(CPM)。在滴管炉上使用静电低压撞击器(ELPI^(+))结合美国环保署202方法的改进方法来研究可凝结颗粒物的化学组成和粒径分布特征。结果发现可凝结颗粒物改进采样方法的结果达到美国环保署202方法结果的81%以上。可凝结颗粒物主要包含有机和无机两部分。其中有机组分由烷烃/烯烃,含氧有机物以及芳香烃三部分组成,无机组分中硫向可凝结颗粒物的迁移最为显著,造成无机中硫酸根的含量最高。对于可凝结颗粒物的粒径分布特征分析可以得出异相凝结对整个粒径段颗粒物都有影响,而均相凝结主要对细颗粒物有影响。可凝结颗粒物中汞浓度为2~4 ng/m³,主要形态是HgCl_(2)和HgBr_(2)。Total particulate matter(TPM)in coal-fired power plants includes filterable particulate matter(FPM)and condensable particulate matter(CPM).The modified method combined Electrostatic Low Pressure Impactor(ELPI^(+))with US Environmental Protection Agency 202 method was used to study the chemical composition and particle size distribution characteristics of condensable particulate matter.The results of the modified method achieve more than 81%with that of the 202 method.The condensable particulate matter contains two parts:organic and inorganic.Organic part was composed of alkane/alkene,oxygen-containing organic matter and aromatic hydrocarbon.The migration of sulfur species into condensable particles in inorganic was the most significant,resulting in the highest content of sulfate in inorganic part.The analysis of the particle size distribution characteristics show that heterogeneous condensation has the major effect on particles in the entire size range,while homogeneous condensation mechanism controls the formation of fine particles.The concentration of mercury in the CPM is around 2~4ng/m³.The most species of mercury on CPM are HgCl_(2) and HgBr_(2).

关 键 词：可凝结颗粒物 粒径分布 均质凝结 异质凝结 

分 类 号：X773[环境科学与工程—环境工程]