Optimization by use Analysis advance exergy for HLNG FPSO-1 unit by thermodynamic analysis and simulations in HYSYS

A literature survey of LNG processes suitable for offshore environment has been evaluated. The survey has been performed with emphasis on space requirements, complexity, efficiency and safety. Thermodynamics theory is described and used in the investigation of the Niche LNG process. The liquefaction part of the HLNG FPSO-1 has been evaluated with respect to its energy consumption, improvements and the possibility to expand the process to give an indication about improvement potentials. In addition, one alternative liquefaction process has been compared with the Niche LNG process. Dual expander processes based on nitrogen as refrigerant are the most proposed solution suitable for offshore applications. Therefore it was chosen as an alternative process to Niche LNG. In the investigation of the two processes the processes simulated were with equal conditions. The Niche LNG process, based on an open methane cycle and a nitrogen cycle, had a significantly lower mass flow rate resulting in 10% lower power consumption. Decision of chosen refrigerant gas (methane or nitrogen) has different specific heat capacity and hence an influence on the flow rate. Methane as refrigerant requires less mass flow rate than nitrogen for a given duty. In addition, higher pressure levels will contribute to increased efficiency and reduced unit sizes

کلیدواژه ها:

exergy ، Niche LNG process ، simulations ، Optimization