基于Aspen Plus的LNG冷能利用及压缩空气储能耦合系统研究

The Coupling System Research on LNG Cold Energy Utilization and Compressed Air Energy Storage based on Aspen Plus

将LNG利用工业余热的发电系统与超临界压缩空气储能系统有机结合,从工程实际出发,根据热力学原理,构建了基于Aspen Plus的LNG冷能发电及压缩空气储能耦合系统模型,探讨了系统压力、温度和涡轮压比等关键参数对系统功率的影响,并从热力学角度对数值结果进行了机理阐释。结果表明,LNG低温火用得到了充分回收利用,实现了LNG冷能"温度对口、梯级利用";随着系统运行压力增大、膨胀级数增加及回热温度提高,净功率呈现了拐点现象。

The LNG makes use of the system which combine industrial waste heat power generation system and the su- percritical compressed air energy storage systems. From the practice, construct LNG cold energy generation and compressed air energy storage coupled model based on aspen plus, discusse the key parameters of the system like pressure, temperature, turbine pressure ratio and etc. Which affect the power system, and explain the mechanism of the numerical results from the point of view of thermodynamics. The results show that the LNG cryogenic exergy can be fully recycled, LNG cold energy achieve ＂temperature counterparts, cascade utilization＂. With the improvement of system operating pressure, swelling stages and regenerator temperature, the cold power presents the inflection phenomenon.