采用质量—时间法的天然气流量标准装置

NATURAL GAS FLOW STANDARD UNIT BY QUALITY TIME METHOD

为建立覆盖全国的、完善的天然气流量量值动态溯源体系，以便最终改善天然气现场计量的准确度，就需要建立天然气流量标准装置。四川石油管理局与中国测试技术研究院合作研制的质量—时间法天然气流量标准装置，包括装置的测量原理、装置的组成和测量系统以及装置测量的总不确定度分析和估算，分析估算的该装置测量的总不确定度优于０１％的原设定指标。对临界流喷嘴进行的校验表明，其喷嘴的测量重复性相对极限误差均小于０１％，完全达到了标准装置的要求。

Natural gas flow standard unit should be built up so as to set up a national and perfect dynamic retrogressive system of natural gas flow value and enhance the accuracy of on the spot gaging natural gas.The quality time method gas flow standard unit developed by Sichuan Petroleum Administration and China Test Technique Institute,including the measurement principle,the composition and measurement system and the total uncertainty analysis and estimation of the unit is introduced.According to analysis and estimation,total uncertainty measured with the unit is less than 0.1% which is the expected index.The check result of critical flow nozzle shows that the repeatability relative error band mesasured with the nozzle is within 0.1%,which can meet the requirements of standard unit.