Applicability Evaluation of Natural Gas State Equations at Low Temperatures

R. I. Ganiev, D. Y. Kutovoy, V. A. Fafurin, M. Shustrova, V. B. Yavkin
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Abstract

The paper analyzes the possibility of operating range expanding of natural gas state equations for low temperatures. The state equations of natural gas and methods of estimating the compressibility factor, entrenched in modern national and international standards, were analyzed. It has been shown that the range of their applicability is limited to a temperature value of 250 K, however, these temperature limitations is not restricted bystate equations directly butstipulated by the lack of reliable data about natural gas compressibility factor values at temperatures below 250 K and methods for complementary errorcalculation that may arise. The results of comparison of values of natural gas compressibility factor as a function of temperature at pressure of 1.3 and 6 MPa calculated by means of the most widely used state equations are presented. It was found that the results of the calculation according to the considered methods have satisfactory convergence within the range of 220 K, that generally confirms the applicability of modern state equations for low temperatures. In its turn, the effect of assumptions applied nowadays to definegas volume flow rateon flow metering error showed that application of substitutive compressibility values may result in significant complementary systematic error. This indicates the practicability of expanding the database of compressibility factor values for natural gas for low temperatures, as well as developmentof a standard to assess the value of the corresponding complementary error.
天然气状态方程在低温条件下的适用性评估
本文分析了在低温条件下扩大天然气状态方程工作范围的可能性。分析了现代国家和国际标准中的天然气状态方程和压缩系数估算方法。结果表明,它们的适用范围仅限于 250 K 的温度值,然而,这些温度限制并不直接受状态方程的限制,而是由于缺乏有关温度低于 250 K 的天然气压缩系数值的可靠数据以及可能出现的补充误差计算方法。本文介绍了在压力为 1.3 和 6 兆帕时,通过最广泛使用的状态方程计算得出的天然气压缩系数值与温度函数的比较结果。结果发现,根据所考虑的方法计算出的结果在 220 K 范围内具有令人满意的收敛性,这从总体上证实了现代状态方程在低温条件下的适用性。反过来,目前用于定义气体体积流量的假设对流量计量误差的影响表明,应用替代压缩性值可能会导致显著的互补系统误差。这表明,扩大天然气低温压缩系数值数据库以及制定评估相应补充误差值的标准是切实可行的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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