加油站油气回收系统VOCs泄漏FID现场检测方法及效果分析  

Effect analysis of FID field detection method for VOCs leakage in oil and gas recovery system of gas station

作　　者：冯雨钦 刘扬 刘畅通 刘泽华 王佩 张锦龙[1] FENG Yuqin;LIU Yang;LIU Changtong;LIU Zehua;WANG Pei;ZHANG Jinlong(School of Physics and Electronics,Henan University,Kaifeng 475004,China)

机构地区：[1]河南大学物理与电子学院,开封475004

出　　处：《环境工程学报》2022年第5期1748-1756,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金面上项目(61675063,61975052);河南大学一流学科培育项目(2019YLZDCG02)。

摘　　要：油气回收系统密闭点VOCs泄漏质量分数值是衡量加油站是否存在超标排放的重要指标。为提高加油站VOCs泄漏检测的时效性、代表性与准确性,采用FID现场检测方法对郑州市某加油站油气回收系统进行了检测,全方位对比分析了实验室气相色谱法与现场检测法的检测时效性、准确性,提出了密闭区域检测及质量保证和控制建议,并根据实际检测数据分析了易泄漏点。结果表明:采用FID现场检测方法对油气回收系统密闭点进行检测,能使检测成本降低90%,检测效率提高15倍;在现场检测前完成仪器的校准、响应时间的测定与精密度的验证工作,可使VOCs最大质量分数偏差维持在5%以下,这进一步验证了FID现场检测方法测量的准确度;油气回收系统泄漏点的确定及现场检测流程和步骤的优化,可有效提高检测数据的代表性;检测设备的定期校准,可确保FID示值相对误差在±10%范围内,响应时间不超过30 s,从而为检测质量控制提供保障;为确保泄漏点完好,结合实际检测工作,应采用液位仪自动计量技术,加强设备的维护保养并设置加油枪气液比为1.05~1.15。综上所述,在保证FID的准确性与稳定性的前提下,采用FID现场检测方法对油气回收系统VOCs泄漏质量分数进行检测具有时效性强、准确度高、数据代表性强等优势。本研究结果可为加油站采用FID现场检测油气回收系统VOCs泄漏的质量分数提供参考。The mass fraction of VOCs leakage at the sealing point of the oil and gas recovery system is an important index to judge whether the gas station has excessive emissions.In order to enhance the timeliness,representativeness and accuracy of detecting the VOCs leakage at gas station,FID field detection method was used to test the oil and gas recovery system of a gas station in Zhengzhou,an all-round comparative analysis was made on the timeliness,accuracy of laboratory gas chromatography and field detection methods.Then the proposals for the closed area detection and quality assurance and control effect were provided.And the easy leakage points were analyzed according to the actually measured data.The results showed that using FID field detection method to detect the sealing point of oil and gas recovery system could reduce the detection cost by 90%and improve the efficiency by 15 times.Before the field detection,the instrument calibration,the response time measurement and the precision verification were completed,the maximum mass fraction deviation could maintain below 5%,which further proved the measurement accuracy of FID field detection method.The determination of leakage point of oil and gas recovery system and the optimization of field detection process and steps could effectively improve the representativeness of detection data.The periodic calibration of testing equipment could ensure that the relative error for FID indication was within±10%and the response time was no more than 30 s,which could provide guarantee for testing quality control.Combined with the actual detection work,adopting the automatic measurement technology of liquid level instrument,strengthening the equipment maintenance and setting the gas-liquid ratio of refueling gun to 1.05~1.15 could ensure the the intact leakage point.In summary,on the basis of ensuring the accuracy and stability of FID,using the FID field detection method to detect the VOCs leakage mass fraction of oil and gas recovery system had the advantages of strong timelines

关 键 词：加油站 油气回收系统 FID 油气泄漏质量分数 现场检测 

分 类 号：X830.2[环境科学与工程—环境工程]