Abstract The main goal of this study is to investigate the effect of natural gas composition on the Joule–Thomson coefficient and Joule-Thomson inversion curve. The Joule-Thomson inverse curve is the geometrical location of points where the Joule-Thomson coefficient is zero. The curve is an important parameter for the liquefaction capability of natural gas. The GERG-2008 equation of state is utilized to calculate the Joule-Thomson coefficient as well as the JT inversion curve. To validate the numerical values, the results are compared with measured values and the validation results show the GERG-2008 calculated Joule-Thomson inversion curve with high accuracy. The results show, that natural gases with larger molecular weights have higher pressures at the same temperature. Also, Based on GERG-2008 data, a novel correlation is presented for the calculation of the Joule-Thomson inversion curve. The correlation has an average absolute percent deviation of less than 2.5% in determining the natural gas Joule-Thomson inversion curve. It should be pointed out that for developing the correlation a huge database of 33,000 natural gas mixture is employed.

中文翻译：

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天然气成分对其焦耳-汤姆逊系数和焦耳-汤姆逊反演曲线的影响

摘要 本研究的主要目的是研究天然气成分对焦耳-汤姆逊系数和焦耳-汤姆逊反演曲线的影响。焦耳-汤姆逊逆曲线是焦耳-汤姆逊系数为零的点的几何位置。该曲线是天然气液化能力的重要参数。使用GERG-2008 状态方程计算焦耳-汤姆逊系数以及JT 反演曲线。为验证数值，将结果与实测值进行比较，验证结果表明GERG-2008计算出的焦耳-汤姆逊反演曲线精度较高。结果表明，在相同温度下，分子量较大的天然气具有较高的压力。此外，基于 GERG-2008 数据，为计算焦耳-汤姆逊反演曲线提供了一种新的相关性。在确定天然气焦耳-汤姆逊反演曲线时，相关性的平均绝对百分比偏差小于 2.5%。应该指出的是，为了建立相关性，使用了一个包含 33,000 种天然气混合物的庞大数据库。