天然气压缩因子在超声波流量计中的实时应用  

Real-time Application of Natural Gas Compressibility Factor in Ultrasonic Flowmeter

作　　者：王森[1] 杨鸣[1] 鲁法利 孙河山[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《现代科学仪器》2015年第5期69-72,共4页Modern Scientific Instruments

摘　　要：为了提高天然气体积计算和贸易结算的灵活性，对压缩因子的准确计算是不可缺少的环节。虽然AGA8—92DC压缩因子计算方法不确定度已达到±0．1％，但计算程序极其复杂不能满足超声波气体流量计中的实时计算。因此根据AGA8-92DC方法编写计算软件，进行数据采样，将采集到的数据存储在单片机中，然后采用Lagrange线性插值对其进行近似计算。结果表明：插值计算的压缩因子与AGA8算法的结果对比能达到10-6的精度，而且计算精度和复杂度相对于Hermite插值方法有所优化。In order to improve the flexibility of gas volume calculation and trading settlement, accurate calculation of the compression factor is indispensable in the process. Although the calculation uncertainty of AGA8-92DC the compression factor calculation method has reached to ＋0.1%, but the process is complex, it cannot satisfy the real-time computation in ultrasonic gas flowmeter. So according to AGA8-92DC method, software for calculation was written, data were sampled and were stored in the single chip microcomputer, then the approximate calculation was done by using Lagrange linear interpolation. Results showed that interpolation calculation of compression factor compared with the results of AGA8 algorithm can achieve the precision of 10-6, and the calculation accuracy and complexity compared with the Hermite interpolation method is optimized.

关 键 词：压缩因子 插值 超声波流量计 实时计算 

分 类 号：TB556[理学—物理]