管输天然气能量计量发热量间接测定核查方法探讨

Study on Verification Method of Metering Calorific Value of Pipeline Natural Gas

研究了在线色谱仪分析、离线分析和赋值组分分析间接计算发热量的方法,并将其应用于组成分析结果质量核查,提出了声速检验核查和动态数据核查2种方法以提升发热量间接测定质量。按照GB/T 30500规定方法开展超声流量计声速检验,当测量声速与计算声速之间的偏差在±0.15%内,天然气组成分析数据符合要求。选取配置在线色谱分析仪站场,根据色谱仪结果动态分析变化趋势,当A级计量系统超过在线发热量波动控制限(最大允许误差±0.5%),判定色谱仪分析结果出现问题,该方法可有效监控发热量数据波动,可确保管输天然气在能量计量过程中数据的准确可靠。

The methods of on-line chromatograph analysis,off-line analysis and assigned component analysis for indirect calorimetry were studied and applied to the quality check of composition analysis results.Ultrasonic flowmeter sound velocity test is carried out in accordance with the prescribed method of GB/T 30500.When the deviation between measured sound velocity and calculated sound velocity is within±0.15%,the analysis data of natural gas composition meets the requirements.Select configuration online chromatographic analyzer station,according to the results of chromatograph dynamic trend analysis,when the A level measurement system more than online calorific value fluctuation control limit(maximum permissible error of plus or minus 0.5%),determine the chromatograph analysis results appear problem,this method can effectively monitor the calorific value data,to ensure pipeline gas in the process of energy metering data accurate and reliable.