工业园区VOCs光离子化气体检测技术适用性研究  

Study on the Applicability of Photoionization Detection Technology for VOCs Monitoring in Industrial Areas

作　　者：蔡云飞 段玉森 党亚婷 陈斐 伏晴艳 徐薇 林长青 高松 CAI Yunfei;DUAN Yusen;DANG Yating;CHEN Fei;FU Qingyan;XU Wei;LIN Changqing;GAO Song(Shanghai Environmental Monitoring Center,Shanghai 200235,China;Beijing SDL Technology Co.,Ltd.,Beijing 102206,China;Orient International Holding Shanghai Environmental Technology Co.,Ltd.,Shanghai 200082,China;Shanghai Jianke Environmental Technology Co.,Ltd.,Shanghai 201108,China;Shanghai University School of Environmental and Chemical Engineering,Shanghai 200444,China)

机构地区：[1]上海市环境监测中心,上海200235 [2]北京雪迪龙科技股份有限公司,北京102206 [3]东方国际集团上海环境科技有限公司,上海200082 [4]上海建科环境技术有限公司,上海201108 [5]上海大学环境与化学工程学院,上海200444

出　　处：《环境科学研究》2023年第9期1676-1683,共8页Research of Environmental Sciences

基　　金：上海市科技创新行动计划项目(No.20dz1204000)。

摘　　要：目前在使用光离子化气体检测器(PID)设备对工业园区挥发性有机物(VOCs)进行监测过程中,设备间监测数据普遍存在偏差大、准确度和稳定性不足等问题,影响了园区VOCs的监测评价与管控.为探究偏差产生的原因,本文选取了市售4个品牌的8套PID监测设备,在工业园区进行实地测试,对其适用性进行研究.结果表明:①在安装了除湿装置后,PID设备在高湿阶段监测正常,同时通过在现场对不同湿度标准气体的测试可知,除湿装置对测试数据的准确性无影响.因此,在高湿度地区采用除湿装置,可提高PID设备监测数据的准确性.②环境空气实测时,虽然与气相色谱仪/氢火焰离子化检测器(GC-FID)设备原理不同,但经过一系列改进措施后,8台PID设备测得总VOCs体积分数变化趋势与GC-FID设备基本一致;同时,同品牌设备间平行性较好,各PID设备与GC-FID设备所测结果的相关系数均在0.82以上,最高可达0.96,但在GC-FID设备监测的VOCs体积分数<50×10−9时,二者相关性不理想.③针对工业园区VOCs监测,本研究提出了将PID设备和GC-FID设备监测数据的比对计算方法,与将PID设备和GC-FID设备的监测数据经过简单求和后进行比对的方法相比,前者的相关性优于后者.研究显示,可通过规定PID设备在工业园区进行报警的浓度,明确与常用设备比对的内容以及增加冷凝装置等方式来提高PID设备的监测准确性,从而提升工业园区O3前体物的管控效果.During the grid monitoring of volatile organic compounds(VOCs)in industrial parks using low-cost PID equipment,the monitoring data deviation between equipment is large,resulting in insufficient accuracy and stability.This is a common problem affecting the evaluation and control of VOCs in the parks.To investigate the cause of this deviation,eight sets of PID monitoring equipment of four different brands were selected for field testing in an industrial park to study their applicability.The results showed that:(1)After installing a dehumidifier,the PID monitoring equipment worked normally in high humidity stages.Moreover,the field test of standard gases with different humidity showed that the dehumidifier had no effect on the accuracy of the test data.Therefore,using a dehumidifier can improve the accuracy of PID monitoring data in high-humidity areas.(2)During environmental air testing,the total VOC concentration measured by the eight PID equipment showed a similar trend to that measured by GC-FID equipment.The correlation coefficients between each PID equipment and the FID equipment were all above 0.82,with the highest correlation coefficient reaching 0.96.However,the correlation between the two pieces of equipment was not ideal in the low-concentration stage(50×10−9)of GC-FID equipment,indicating that PID equipment is suitable for rapid alarm detection with concentrations above 50×10−9.(3)For the monitoring of VOCs in industrial parks,this study proposes the method of comparing the monitoring data from PID equipment and GC-FID equipment after corresponding calculation,and the correlation of the former method is better than that of the latter method,compared with the method of comparing the monitoring data from PID equipment and GC-FID equipment after simple summation.(4)The research shows that the accuracy of PID monitoring can be improved by specifying the concentration of PID devices to trigger alarms in industrial parks,clarifying the comparison with commonly used devices,and adding condensation devices

关 键 词：PID 监测 挥发性有机物(VOCs) 

分 类 号：X815[环境科学与工程—环境工程]