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天然气压缩系数(Z)的计算精度的高低是很重要的。文中介绍了40年代以来所提出的压缩系数的多种计算方法,并作出评价。对于非烃类气体含量不高的天然气,用S—K图算法计算的绝对平均偏差值约为3％;而用偏心因子法和EMR法的准确度均比S—K图算法高,但其计算过程较麻烦。随着电算技术的广泛应用,以状态方程呈计算Z的方法发展很快,其中尤以R—K方程使用较多,对非烃类组分和重烃含量不高的天然气,它可达到很高的准确度。对CO_2和H_2S含量较高的天然气,在使用上述各种方法计算时,可采用临介温度较正法校正,也可得到满意的结果。
Natural gas compression factor (Z) calculation of the level of accuracy is very important. In this paper, a variety of calculation methods for compressibility coefficients proposed since the 1940s are introduced and evaluated. For natural gas with low non-hydrocarbon gas content, the absolute mean deviation calculated by the S-K graph algorithm is about 3%. However, both the eccentric factor method and the EMR algorithm are more accurate than the S-K graph algorithm. However, Calculation process is more troublesome. With the wide application of computer technology, the method of calculating Z by the equation of state has developed rapidly, especially the R-K equation is more used. For non-hydrocarbon components and natural gas with low heavy hydrocarbon content, it can reach High accuracy. Natural gas with high CO 2 and H 2 S contents can be corrected by the comparison of positive temperature and positive result when using the above methods.