石化企业几种典型装置LDAR技术及VOCs排放量分析

基于泄漏检测与修复(LDAR)技术的实施，分析4家不同石化企业的3种典型装置(常(减)压蒸馏装置、催化裂化装置及连续重整装置)的LDAR台账及核算挥发性有机物(VOCs)排放量。结果表明，各企业及装置的设备动静密封点以连接件、法兰和阀门3类为主(占密封点总数97%以上)，其中以阀门和法兰泄漏最为严重。采用相关方程法核算VOCs排放量可知，以阀门、开口管线和法兰为主的泄漏密封点对VOCs排放量贡献最大(约占80%)；泄漏密封点的修复率平均能达到70%，VOCs减排率最高能达到73%。对于不同的石化企业，连续重整装置是设备动静密封点最多、泄漏率最高、VOCs排放量最大的装置。此研究对控制石化企业设备动静密封点的VOCs排放具有一定借鉴意义。

VOCs Emission From Several Typical Units in Different Refineries With LDAR Technology

Based on the implementation of leak detection and repair (LDAR) technology, the LDAR records and volatile organic compounds (VOCs) emissions of three typical units (i.e. atmospheric (and vacuum) distillation unit, catalytic cracking unit and continuous reforming unit) in four different Chinese refineries were analyzed. Study results indicate that connectors, flanges, and valves are the most common connection fittings, which account for more than 97% of the total connection fittings. Among them, the most serious leaking components are valves and flanges. Then correlation equation method was used to calculate the VOCs emissions. Calculation results suggest that valves, open-ended lines and flanges contribute to most of VOCs emissions (about 80%). 73% VOCs emissions reduction has been achieved after repairing 70% leaking components. Among the three units, the reforming unit has the largest amount of connection fittings, the highest leaking percentage, and the largest VOCs emissions. This study is important in VOCs emissions control from equipment leaks in refineries.