Abstract
The liquefaction natural gas (LNG) process is one of the most important thermodynamic processes in the cryogenic gas industry. The operating conditions change during the compression process, throttling and heat transfer, changing the thermodynamic properties of the natural gas (NG) and refrigerants in the major equipments, including cryogenic compressors, expanders, coolers and heat exchangers. To improve the energetic efficiency of LNG plant, a thermodynamic analysis by the exergetic method was used. Energy equilibrium equations and exergy equilibrium equations of each equipment in the Air Products and Chemicals Inc (APCI) process were established. This paper is limited to the exergy analysis of the mixed refrigerant (MR) components: the axial and centrifugal compressors and the main cryogenic heat exchanger. The results show that the inlet temperature and inlet pressure of MR compressors has an impact on the evolution of the exergy efficiency. For a process MR, axial compressor is the main equipment contributing to total exergy losses.
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