基于氧弹热量计测量天然气发热量标准装置及方法的研究

Study on the Reference Calorimeter and Method for Determining Calorific Value of Natural Gas Based on Oxygen Bomb Calorimeter

根据天然气能量计量的研究现状和应用需求，研究了天然气发热量测量标准装置，采用绝热式氧弹热量计测量高纯甲烷气体发热量，使测量结果通过燃烧热标准物质溯源到国际单位上。设计并研制了平衡取气装置系统，实现了燃烧前样气的采集。高纯甲烷发热量测量结果为39900J/m3，扩展不确定度为0．6％（k=2）。

According to the research status and application requirements for energy measurement, the reference calorimeter of natural gas is studied. The calorific value of high-purity methane is determined by the oxygen bomb calorimeter, an adiabatic oxygen bomb calorimeter calibrated by the CRM of benzoic, which calorific value of the benzoic CRM traces to SI unit via the national standard. The device sample collect and equilibrium designed by NIM is described. The superior calorific value of methane is 39 900 KJ/m3 with an expanded rative uncertainty of 0. 6% （ the expanded factor, k = 2）.