测量固定源可凝结颗粒物的稀释间接法及系统  

In⁃direct dilution method and sampling system for measuring condensable particulate matter from stationary sources

作　　者：邓建国[1] 张莹 王乐冰 李妍菁 段雷[1,2] 郝吉明 蒋靖坤[1,2] DENG Jianguo;ZHANG Ying;WANG Lebing;LI Yanjing;DUAN Lei;HAO Jimin;JIANG Jingkun(School of Environment,Tsinghua University,Beijing 100084;State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex,Beijing 100084)

机构地区：[1]清华大学环境学院,北京100084 [2]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

出　　处：《环境科学学报》2020年第11期4162-4168,共7页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划(No.2018YFC0213202);国家能源集团科技创新项目(No.GJNY⁃19⁃56)。

摘　　要：固定源排放的可凝结颗粒物(CPM)已引起广泛关注,但我国尚没有标准测量方法.本研究报道了可用于固定源可凝结颗粒物测量的稀释间接法,并开发了基于单旋风切割头的测量系统,提高了可凝结颗粒物测量的准确性及测量仪器的便携性.在常温和烟气温度下旋风切割头的颗粒物分离效率均满足国际标准对切割头分离效率的要求.基于燃煤电厂等固定源现场评测结果和测量系统适用性的考量,建议稀释间接法及测量系统的关键运行参数如下:稀释比为10∶1,停留时间为10 s,稀释后的烟气温度≤30℃,相对湿度≤70%.用所研发的稀释间接法测量系统对燃煤电厂、钢铁厂烧结机机头和钢铁焦化厂总排口可凝结颗粒物进行了测试,结果表明,燃煤电厂总排口CPM平均浓度为(0.8±0.3)mg·m-3,钢铁厂烧结机机头总排口CPM平均浓度为(6.2±1.7)mg·m-3,钢铁焦化厂总排口CPM平均浓度为(1.2±0.8)mg·m-3.The condensable particulate matter(CPM)emission from stationary sources has caused extensive concern,however there is no standard method for CPM measurement in China.In this study an in⁃direct dilution system for measuring CPM emission from stationary sources was presented,in which a single cyclone sampler was deployed to improve the measurement accuracy and system flexibility.The collection efficiency of the cyclone satisfies the criterion of ISO 7708 for particle size selection under both room and flue gas temperature.According to the measurement data from stationary sources such as coal⁃fired power plant,as well as to maintain the flexibility of the system,operation parameters including a dilution ratio of 10∶1,a residence time of 10 s,a temperature after dilution of≤30 Celsius,and a relative humidity of≤70%were chosen for field measurements.Finally,CPM emission from coal fired power plant and steel industry were measured.The average CPM concentration at stacks of coal fired power plant,sintering plant and coking plant were(0.8±0.3),(6.2±1.7)and(1.2±0.8)mg·m-3,respectively.

关 键 词：固定源 可凝结颗粒物(CPM) 稀释间接法 燃煤电厂 钢铁厂 

分 类 号：X831[环境科学与工程—环境工程] X851