天然气脱硫脱碳和脱水工艺的节能模拟与优化

Energy-saving simulation and optimization of natural gas desulfurization and decarbonization and dehydration process

针对某450万m^(3)/d天然气净化装置,利用Aspen HYSYS软件对天然气脱硫脱碳和脱水工艺进行建模,基于夹点技术分析天然气净化装置的换热网络节能潜力和不合理换热之处,基于灵敏度分析操作参数节能潜力,确定甲基二乙醇胺(MDEA)和三甘醇(TEG)溶剂的最佳循环量。结果表明:通过夹点技术分析,天然气净化装置换热网络的节能潜力为307.80 kW,占现行加热公用工程和冷却公用工程消耗量的4.97%,5.65%;通过灵敏度分析,MDEA和TEG的循环量分别取95.00,5.00 m^(3)/h,操作参数优化的最大节能潜力为2527.95 kW,占现行加热公用工程和冷却公用工程消耗量的40.86%,46.43%;通过换热网络改造和操作参数优化,装置最大节能量为2795.41 kW,占现行加热和冷却公用工程消耗量的45.18%,51.34%;2种节能优化方案可节省操作费用144.72万元/a,回收期为0.174 a。

For a natural gas purification plant with a capacity of 4.5 million m^(3)/d,Aspen HYSYS software was used to model the natural gas desulfurization,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 determined.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 m^(3)/h and 5.00 m^(3)/h,and the maximum energy-saving potentials of operation parameter optimization was 2527.95 kW,accounting for 40.86%and 46.43%of the current heating and cooling utilities consumption.According to the heat exchange network retrofit and the optimization of operating parameters,the maximum energy-saving values of the process was 2795.41 kW,corresponding to 45.18%and 51.34%of the current heating and cooling utilities consumption.For the proposed two energy-saving optimization schemes,the annual operating cost savings was 1447.2 thousand Yuan/a,and the recovery period was 0.174 a.