中文关键词固定源可凝结颗粒物(CPM)稀释法冷凝法细颗粒物(PM_2.5) 英文关键词stationary sourcecondensable particle matter (CPM)dilution methoddry impinger methodPM_2.5

作者	单位	E-mail
蒋靖坤	清华大学环境学院, 北京 100084 国家环境保护大气复合污染来源与控制重点实验室, 北京 100084	jiangjk@tsinghua.edu.cn
邓建国	清华大学环境学院, 北京 100084
王刚	清华大学环境学院, 北京 100084
张莹	清华大学环境学院, 北京 100084
李妍菁	清华大学环境学院, 北京 100084
段雷	清华大学环境学院, 北京 100084 国家环境保护大气复合污染来源与控制重点实验室, 北京 100084
郝吉明	清华大学环境学院, 北京 100084 国家环境保护大气复合污染来源与控制重点实验室, 北京 100084

中文摘要 随着燃煤电厂以及钢铁等非电行业超低排放改造的进行，固定污染源可过滤颗粒物（FPM）排放浓度逐渐降低，可凝结颗粒物（CPM）的排放逐步引起关注.然而目前对CPM的认识不足，尚没有国际统一的标准测量方法.本研究分析了可用于固定源CPM测量的3种方法，包括冷凝法、稀释间接法和稀释直接法，并在燃煤电厂、钢铁焦化厂和钢铁烧结厂等固定源进行了CPM现场测量.结果表明，8个电厂和钢铁厂冷凝法测得的CPM质量浓度均显著高于稀释间接法和稀释直接法测量结果.冷凝法测得的CPM中含有大量的SO₄^2-、Cl^-等水溶性离子，其浓度显著高于稀释间接法和稀释直接法测量结果.稀释直接法测量的CPM浓度相对较低.冷凝法测量过程中由于水蒸气过饱和冷凝成水吸收SO₂和HCl等易溶于水的气体，进而显著高估了CPM实际排放浓度.稀释间接法能模拟实际大气环境中CPM的形成过程，且不存在冷凝水吸收等问题. 英文摘要 With the retrofitting of coal-fired power plants and steel plants for ultra-low-emission control, the concentration of filterable particles (FPM) from these sources is decreasing gradually. The condensable particle matter (CPM) draws more attention. The understanding of CPM emission concentration and chemical characteristics is still limited. There has been no standard determination method of CPM in China until now. In this study, three methods, including the dry impinger method (US EPA method 202), indirect dilution method, and direct dilution method, are discussed and compared in measuring CPM emissions from coal-fired power plants, coke-making plants and sintering plants. The results show that method 202 overestimates the emissions of CPM, due to the fact that the gaseous HCl or SO₂ dissolves into condensable liquid and cannot be completely eliminated by N₂ purging after sampling. Instead, CPM measured using the indirect dilution method better represents its real emission levels into the atmosphere.

PDF全文下载地址:

https://www.hjkx.ac.cn/hjkx/ch/reader/create_pdf.aspx?file_no=20191205&flag=1&journal_id=hjkx&year_id=2019