For a natural gas purification plant with a capacity of 4.5 million m3/d,Aspen HYSYS soft-ware was used to model the natural gas desulfuriza-tion,decarbonization,and dehydration processes.Based on the pinch technology,the energy-saving potentials and unreasonable heat transfer of the heat exchange network of the process were analyzed.Based on the operational energy-saving potentials through sensitivity analysis,the optimal cycle flow rate of MDEA and TEG solvents could be deter-mined.The results showed that the energy-saving potentials of the natural gas purification plant′s heat exchange network was 307.80 kW,corresponding to 4.97%and 5.65%of the current heating and cooling utilities consumption.Through sensitivity analysis,the cycle flow rate of MDEA and TEG were 95.00 m3/h and 5.00 m3/h,and the maximum energy-saving potentials of operation parameter optimization was 2 527.95 kW,accounting for 40.86%and 46.43%of the current heating and cooling utilities consump-tion.According to the heat exchange network retrofit and the optimization of operating parameters,the maximum energy-saving values of the process was 2 795.41 kW,corresponding to 45.18%and 51.34%of the current heating and cooling utilities consump-tion.For the proposed two energy-saving optimiza-tion schemes,the annual operating cost savings was 1 447.2 thousand Yuan/a,and the recovery period was 0.174 a.
关键词
天然气净化/脱硫脱碳/脱水/节能分析/夹点技术/灵敏度分析/模拟优化
Key words
natural gas purification/desulfuriza-tion and decarbonization/dehydration/energy-sav-ing analysis/pinch technology/sensitivity analysis/simulation and optimization
维普
万方数据