输气干线管输损耗率指标

Pipeline transport loss index of gas trunk line

管输损耗率是天然气运销企业的重要经济指标,也是天然气交接双方非常关注的经济参数。分析了计量系统计量精度、管存及放空量计算偏差对损耗率的影响,明确提出计量系统的计量误差是导致输气干线管输损耗的主要原因。建立了输气干线复杂流量计量系统不确定度分析模型,基于误差合成与传递理论,得到了管道系统进气端和出气端总的计量不确定度,提出了管输损耗率指标计算方法。应用表明,通过实际损耗率和损耗率指标的对比,可以进行管输损耗预警,为流量计检修更换提供依据。

Pipeline transport loss is an important economic index for natural gas transmission and distribution business and also an economic parameter greatly concerned at both sides of custody transfer. This paper analyzes how the errors in resolution of the metering system and in calculation of pipe inventory and blow-down volume on the transport loss, and clearly puts forward that the error of the metering system is the primary cause for transport loss of gas trunk line. The uncertainty analysis model of the complex flow metering system for gas trunk line is established. Based on the error synthesis and transfer theory, total uncertainties at both inlet and outlet of the pipeline system are obtained. A calculation method of pipeline transport loss index is proposed. The application shows that the index comparison of actual loss and loss can be used for warning of pipeline loss, in order to provide a reference for the repair and replacement of flowmeter.