基于Aspen HYSYS方法的制冷剂液化沼气流程优化分析

Process Analysis of Refrigerant Liquefaction of Biogas by Aspen HYSYS Method

沼气液化流程优化分析对利用沼气及建立沼气新能源系统具有重要的指导意义。文章在深入研究天然气的混合制冷剂液化循环的基础上,针对沼气的特点及液化条件分析,设计了单级制冷循环、带预冷多级制冷循环两种沼气液化系统。分析了两流程沼气液化系统内的压力、温度等对系统性能的影响,优化了该系统内的参数,优化该系统内的参数,结果表明:在相同条件下,带预冷混合制冷剂的液化流程比单级制冷比能耗低。以单位能耗最小目标进行优化后,单级制冷流程的换热温差较小,热负荷较高,需要增加强化传热装置及增加换热面积。带预冷的混合制冷剂的能耗低,能量损失少。

Two gas liquefaction systems, single refrigeration cycle and multi-refrigeration cycle with pre-cooling, were designed , which based on the characteristics of methane and liquefaction conditions. The influences of pressure and temperature on system performance were analyzed. The parameters of the system were optimized. The results showed that the energy consumption in the system of multi-refrigeration cycle was lower than that in the single refrigeration system, and its energy loss was smaller. The single refrigeration system needed to enhance the performance of heat transfer device and increase the heat transfer area.