LDAR检测周期对石化企业VOCs排放量估算的影响

Impact of LDAR Detection Cycle on VOCs Emission Estimation in Petrochemical Enterprises

LDAR动静密封点检测是VOCs排放量估算的一项主要工作,是石化行业泄漏评估的基础。检测指标的类型、方法和周期决定了年排放量的估算及泄漏评估,但由于检测资金、设备停车维护、地方法规等各方面的原因,采用的检测周期存在较大的差异。在相关系数方程法核算排放速率的基础上,通过对年产30万t苯酚和18.5万t丙酮设备装置的动静密封点检测和数据分析,研究了检测周期对该石化企业年排放量估算的影响。结果表明,检测数据对排放量估算有着重要影响,尤其是数据随时间的变异性较大时,其影响更为显著。检测周期对排放量估算的影响会影响到该企业年VOCs的总排放量。检测周期较长时,企业未能及时对装置的密封点泄漏进行修复,检测后排放量估算可能性随之升高。短的检测周期可以及时修复更多的泄漏点,大幅提高LDAR排放量估算的准确性,同时也减少了VOCs排放量,进而也消减了安全隐患和物料损失。

LDAR dynamic and static sealing point detection is one of the main tasks of VOCs emission estimation,and is the basis of leakage assessment in petrochemical industry.The types,methods and cycles of testing indicators determine the estimation of annual emissions and leakage assessment.However,due to various reasons such as testing funds,equipment parking maintenance,local laws and regulations,the testing cycles adopted are quite different.Based on the correlation coefflcient equation method to calculate the emission rate,this paper studies the influence of the detection period on the annual emission estimation of petrochemical enterprises by detecting and analyzing the dynamic and static sealing points of 300,000 tons of phenol and 185,000 tons of acetone equipment.The results show that the measured data have an important impact on the estimation of emissions,especially when the data variability with time is large.The impact of the detection cycle on emission estimation will affect the total annual VOCs emissions of the enterprise.When the testing period is long,the enterprise can not repair the leakage of the sealing point of the device in time,and the possibility of estimating the discharge after testing increases accordingly.Short detection cycle can repair more leaks in time,greatly improve the accuracy of LDAR emissions estimation,but also reduce VOCs emissions,and thus reduce the potential safety hazards and material losses.