液化天然气过程的热力学分析

利用R K S方程建立了天然气和液化天然气焓火用计算的热力学模型;对 2×104 m3 /d液化天然气液化过程进行了模拟计算;计算了各设备的火用损失和液化过程的火用效率;热力学计算分析结果表明,装置的最大火用损环节是循环压缩机,其次是透平膨胀机和气波制冷机。本装置利用自身所产尾气作为燃气发动机的燃料,进而利用燃气发动机带动循环压缩机,节省了大量电能,回收了排放尾气的能源,有效地解决了压缩机的高能耗问题。

Thermodynamic analysis of liquefied natural gas process

A thermodynamic models of natural gas and liquefied natural gas′s (LNG) enthalpy exergy was presented using R-K-S Equation. The liquefaction process of a LNG device with a capacity of 2×10~4 m~3/d were simulated and calculated. Exergy losing of every equipment and the exergy efficiency were calculated. The thermodynamic (analysis) results show that the recycle compressor is the most exergy-loss equipment, the turbine expander and gas wave machine are the second. In this process, the power of the recycle compressor is gas engine. The fuel of the gas engine is the exhaust gas of the process. By this method, the problem of high energy consuming is (resolved effectively. )