LNG到港交接计量的影响因素及误差核定

Influencing Factors and Error Verification of LNG Arrival Handover Measurement

液化天然气到港交接受到温度、压力等多种影响,在交接过程中需要对多个参数进行测量。测量过程必然会产生误差并随着过程的推进而逐步累积。在此种情况下,探讨误差的来源、影响因素及具体的核定具有多重意义。因此,在总结了计量方式及计算规则的基础上,对误差的来源及影响因素进行了系统分析。并通过实例计算的方式探讨不同误差对总误差的占比发现,液态体积测量过程以及甲烷含量测量过程中产生的误差最大,分别达到86.07%和31.51%,二者可以共同解释误差变量大于85%适宜于作为误差计算的标志性指标。

The delivery of liquefied natural gas to the port is affected by temperature, pressure, etc., and multiple parameters need to be measured during the delivery process. The measurement process is bound to produce errors that accumulate as the process progresses. In this case, it is of multiple significance to explore the sources of errors,influencing factors and specific verification. On the basis of summarizing the measurement methods and calculation rules, this paper systematically analyzes the sources and influencing factors of errors. And the proportion of different errors to the total error is discussed by way of example calculation. It is found that the errors generated in the liquid volume measurement process and the methane content measurement process are the largest, reaching 86.07% and 31.51% respectively. The two can jointly explain the error variable greater than 85%. It is suitable as a landmark indicator for error calculation.