压缩空气与天然气降压过程的火用对比分析

Exergy Comparative Analysis of Depressurization Processes of Compressed Air and Natural Gas

分析压缩空气降压过程与高压管道天然气降压过程比焓火用、比压力火用、比温度火用的变化,对两者进行对比分析。天然气降压过程与压缩空气降压过程比焓火用变化量变化趋势基本一致。终了压力相同时,随着初始压力的增大,天然气和空气的比焓火用变化量差值增大。在利用压缩空气模拟天然气降压过程中,对压缩空气比温度火用变化量和比压力火用变化量进行修正,给出了修正系数。

The changes of specific enthalpy exergy,specific pressure exergy and specific temperature exergy of the compressed air depressurization process and the pipeline natural gas depressurization process are analyzed,and the comparative analysis of the both is carried out.The change trend of specific enthalpy exergy variation of depressurization processes of thenatural gas and the compressed air is basically the same.The difference of specific enthalpy exergy variation of the natural gas and air increases with the increase of the initial pressure when the final pressure is the same.In the process of using compressed air to simulate natural gas depressurization,the specific temperature exergy variation and specific pressure exergy variation of compressed air are corrected,and the correction coefficient is given.