Abstract: It has made perfect in this article the methods in calculating z-factors of natural gas by using Hall Yarborough's formula,an approximate equation of the "reduced" density of the optimum initial value is suggested.By this equation,y' can be determined so that the value of "z" can be determined in less than 5 iterations without divergence.This will give a convenience for the calculation of z by an electronic computer.

摘要： 本文完善了用霍尔-雅布洛克公式求天然气压缩因子的计算方法,提出“对比”密度初始值最佳值的近似关系式,用此式求y',使求压缩因子时的迭代次数在5次以内,并且不会出现不收敛的情况,使用电算求压缩因子更快,更准.

关键词: 压缩因子, 天然气, 初始值, 迭代次数, 布洛克, 对比压力, 对比温度, 对比密度, 关系式, 计算方法