摘要
在长输天然气管道能耗中,天然气压缩机组能耗占比超过95%,其能耗高低对天然气企业运行成本影响最大。国内采用行业标准SY/T 6637-2012测试和计算其实际的性能曲线和能效情况,近年使用该标准计算出的压缩机多变压缩功、多变效率、机组效率等压缩机组能效关键参数与国外厂家提供的数据不一致的问题,极大影响了天然气管道的优化模型准确度、与国外先进管道对标、机组能效分析等能源管理工作。通过对比分析国内外多项标准的差异,发现标准SY/T 6637-2012在多变指数、焓值以及多变压缩功计算方法等方面与国际主流标准存在较大差异。本研究针对差异,逐项进行了对比计算,并与出厂数据和现场实际数据进行了两次验证。研究结果表明:①气体焓值以NIST软件计算结果为基准,人工查图法计算焓值的误差为6.55%左右,BWRS、RKS、PR共3种状态方程计算方法的误差分别为1.75%、2.75%、0.57%;②SY/T 6637-2012在计算多变压缩功时未考虑实际天然气的压缩性,未对结果进行修正,未加入多变压缩功修正因子;③多变效率的计算以NIST软件计算结果为基准,SY/T 6637-2012、BWRS、RKS、PR、CTO的计算偏差分别为:6.12%、2.27%、3.26%、0.12%、0.53%。根据以上对标分析结论完善后的标准SY/T 6637-2018已于2019年3月发布实施,经过一年以上在实际天然气管道站场的应用,证明该计算方法与生产厂家、国外标准保持了高度一致;修改后的测试方法适合国内站场能耗计量仪表和安装位置的实际情况,为国内天然气管道压缩机组提供了可靠的能效计算方法。
In long distance natural gas pipelines,the energy consumption of the natural gas compressor units account for more than 95%,and their energy consumption has a great influence on natural gas enterprises.Domestically the industry standard SY/T 6637-2012 is used to test and calculate the practical performance curve and the energy efficiency status.In recent years,the standard has been used to calculate the polytropic efficiency of compressors and the unit efficiency.But the calculated results weren’t consistent with the contributed data by foreign manufacturers.This inconsistence greatly influenced the accuracy of gas pipeline optimization models and foreign advanced pipelines as the yardstick of energy management.By the comparison and analysis of domestic and foreign standards,it was found that standard SY/T 6637-2012 is quite different from the mainstream international standards in terms of variable index,enthalpy value and variable compression work calculation.In view of the differences,the comparison and calculation were carried out,and the results were verified twice with factory data and actual field data.The results show that:(1)In terms of enthalpy of gas,the error of calculating enthalpy by the looking up the chart method is 6.55%,and the error of calculating method of BWRS,RKS and PR is 1.75%,2.75%and 0.57%,respectively.(2)In the calculation of variable compression work,SY/T 6637-2012 didn’t consider the compressibility of gas,modify the results,and add the variable compression work correction factor.(3)In the calculation of polytropic efficiency,based on the calculation results of NIST software,the calculation deviations of SY/T 6637-2012,BWRS,RKS,PR and CTO were 6.12%,2.27%,3.26%,0.12%and 0.53%respectively.Based on the above analysis,SY/T 6637-2018 has been released and implemented in March 2019.After one year application,the calculation method is consistent with the manufacturers'and foreign standards,and the calculation results are consistent.The test method is suitable for the actual situation of domestic stations and yard energy consumption meters and installation location,and provides a reliable energy efficiency calculation method for natural gas pipeline compressor units.
作者
刘国豪
侯磊
潘腾
赵一桦
陈林
李清平
LIU Guohao;HOU Lei;PAN Teng;ZHAO Yihua;CHEN lin;LI Qingping(National Engineering Laboratory for Pipeline Safety,Beijing 102249,China;College of Mechanical and Transportation Engineering,China University of Petroleum-Beijing,Beijing 102249,China;PipeChina North Pipeline Company,Langfang 065000,China;The Fifth Purification Plant of the First Gas Production Plant of Changqing Oilfield,Xi‘an710000,China)
出处
《石油科学通报》
2021年第4期657-664,共8页
Petroleum Science Bulletin
基金
中国石油天然气股份有限公司科研项目《管道压缩机组和输油泵机组能效测试方法国际接轨研究》(2015B-3410-0501)
石油天然气行业标准修订项目《天然气输送管道系统能耗测试和计算方法》《国家能源局综合司关于下达2017年能源领域行业标准制(修)订计划及英文版翻译出版计划的通知》(能源20170228)联合资助。
关键词
天然气管道压缩机
多变指数
多变压缩功
多变效率
测试方法
计算方法
标准修订
natural gas pipelines
compressors
polytropic index
polytropic compression work
polytropic efficiency
test methods
calculation methods
standard revision
