C3/MRC天然气液化工艺优化模拟

Optimization and simulation of C3/MRC natural gas liquefaction process

为降低天然气液化中丙烷预冷混合冷剂液化工艺(C3/MRC)的能耗,采用Aspen HYSYS软件建立了优化计算模型。结合KBO法和优化器中的Box算法,以系统最小能耗为目标函数,换热器最小换热温差3℃为约束条件,工艺参数和制冷剂配比为决策变量,对C3/MRC流程进行了优化模拟。结果显示,优化后单位质量天然气的液化能耗为351.49 kW·h/t,与国外经典的C3/MRC液化流程相比,能耗显著降低。

In order to reduce the energy consumption of propane-mixed refrigerant cycle process(C3/MRC)in the natural gas liquefaction,the optimization calculation model of C3/MRC was established by using Aspen HYSYS software.Combining the KBO method and the Box algorithm in the optimizer,with the minimum energy consumption as the objective function,the minimum temperature difference of the heat exchanger(3℃)as the constraint condition,and the process parameters and refrigerant ratio as decision variables,the C3/MRC process was optimized and simulated.The results show that the liquefaction energy consumption per unit mass of natural gas after optimization is 351.49 kW·h/t,which is significantly lower than the foreign classical C3/MRC liquefaction process reported in the literature.