| 摘要: |
| 目的 管网管理人员每天需计算输差，当输差超过预警值时，需要分析异常原因。准确的输差计算方法有助于及早发现问题，并为原因分析提供支持。方法 通过选取一定的步长将天然气长输管道相邻站场间的管道划分为若干控制体，采用经典的四阶龙格-库塔法，分别计算不同控制体内两端的温度、压力。当步长足够小时，控制体两端的温度、压力变化极小，可取控制体的平均压力和平均温度来计算控制体管存量，进而计算输差。结果 在计量仪表测量准确，压缩因子计算采用AGA 92DC方法的情况下，该方法的输差率绝对值大多小于现场方法的输差率绝对值，计算出的输差率绝对值的平均值小于现场方法计算出的输差率绝对值的平均值。结论 该方法计算出的输差率小于现场采用方法计算出的输差率，现场方法计算得到的输差偏大。 |
| 关键词: 天然气 管道 管存量 输差 |
| DOI：10.3969/j.issn.1007-3426.2025.03.019 |
| 分类号: |
| 基金项目: |
|
| Influence of calculation method of natural gas pipeline stock on calculation of transmission loss |
|
XIE Ying1, WANG Enkai1, MAI Fangrui2, ZUO Zhijian3, WANG Yu1
|
|
1.Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan, China;2.International Business Division, China Petroleum Pipeline Engineering Co., Ltd., Langfang, Hebei, China;3.PetroChina Tarim Oilfield Company, Korla, Xinjiang, China
|
| Abstract: |
| Objective Pipeline network managers need to calculate the transmission loss daily. When the transmission loss exceeds the warning value, it is necessary to analyze the abnormal causes. An accurate calculation method of the transmission loss is conducive to the early detection of problems and provides support for the analysis of causes. Method By selecting a certain step size, the pipeline between adjacent stations of the long-distance natural gas pipeline was divided into several control volumes. Using the classic fourth-order R-K formula, the temperatures and pressures at both ends of different control volumes were calculated respectively. When the step size was small enough and the temperature and pressure changes at both ends of the control volume were extremely small, the average pressure and temperature of the control volume could be taken to calculate the pipeline stock of the control volume, and then the transmission loss could be calculated. Result In the case of accurate measurement of the metering instrument and the adoption of the AGA 92DC method for the calculation of the compression factor, the absolute value of the transmission loss rate calculated by this method was mostly smaller than that of the field method, and the average value of the absolute value of the transmission loss rate calculated by this method was smaller than that calculated by the field method. Conclusion The transmission loss rate calculated by this method is smaller than that calculated by the field method, and the transmission loss calculated by the field method is larger. |
| Key words: natural gas pipeline pipeline stock transmission loss |
