基于声速核查方法的天然气能量计量标准装置

为解决天然气能量测量中组分数据测量频率低带来的测量周期内发热量变化无法核查的问题，利用声速核查天然气组分变化导致发热量、压缩因子的变化，研究了声速核查能量模型，搭建了具备10 MPa、2 000 m³/h测量能力的天然气能量计量标准装置，该装置测量能量的时间由原有的分钟级提升到秒级。通过天然气实流测量，对天然气能量计量标准装置的不确定度进行系统评定，其相对扩展不确定度为0.33%(k=2)。

Standard Facility of Natural Gas Energy Measurement Based on Verification Method of Sound Velocity

For the energy flow measurement of natural gas, the measurement frequency of component data of natural gas is relatively low, which results in that the change of calorific value within the cycle cannot be found. The mathematical model of the sound velocity to verify energy is built based on the use the sound velocity to verify changes of the calorific value and compression factor caused by changing of components. Based on this theory, the standard facility of natural gas energy measurement is built, which has a measurement capability of 10MPa and 2000m3/h, and the measurement frequency of energy flow has been improved from the original minute level to the second level. The uncertainty of the standard facility is evaluated through the measurement of the natural gas energy flow rate on site, which is 0.33% (k=2) for the relative expanded uncertainty.