天然气压缩因子计算及影响因素分析

Calculation of Natural Gas Compressibility Factor and Its Influence Factors

天然气长输管道首端与末端之间往往会出现输差,输差是影响输气成本的一个最关键的因素。针对出现的输差问题,以天然气组分为基础,以压缩因子作为突破口,通过着重理解天然气压缩因子的解法与改进来得到控制输差。以BWRS方程为重点,通过Excel求得方程系数,然后从中解出气体密度,再代入气体状态方程中求得压缩因子。通过对天然气压缩因子的求解,得到影响压缩因子的主要因素,从而修正到天然气输量,以便减少输差。

Measurement shortage will often arise between the head and the end of nature gas pipeline which is a vital important influencing factor of transmission cost. Regarding to the phenomenon of measurement shortage, we focused on the compressibility factor and tried to solve the problem by optimizing the calculation method of the compressibility factor so that the phenomenon can be well control. On the basis of BWRS equation, first equation coefficients were obtain by Excel, then the gas density was calculated with these coefficients, finally all these results were put into the gas state equation to obtain the compressibility factor. By solving the gas compressibility factor, its main influencing factors were determined, which could help to correct the throughput of natural gas to keep measurement shortage to the minimum.