有机工质低温余热发电的模拟与优化

Simulation and Optimization of Low-temperature Waste Heat Power Generation Based on Organic Rankine Cycles

以热力学第一定律和第二定律为基础,对有机朗肯循环低温余热发电系统进行了热力分析.用Aspen plus软件,对循环系统中的几个重要影响参数进行了模拟研究.研究结果表明:工质处于饱和状态时系统的性能最优;增大蒸发压力或减小冷凝压力都能提高系统的热效率和火用效率.在原有基本朗肯循环的基础上,采用乏气回热循环或中间抽气回热循环,二者均能改善系统的性能.

Thermal analysis of Organic Rankine Cycle （ORC） driven by low-temperature waste heat was investigated based on the first and second laws of thermodynamics. The system was simulated with the software Aspen plus. The effects of superheat, subcooling, evaporation temperature and condensing temperature on the performance of the system were analysed respectively. The results show that the system with saturated working fluid gives the best performance, the thermal efficiency and exergy efficiency were improved by increasing e- vaporation pressure or reducing condensing pressure. The regenerative ORC gives better performance than basic Rankine cycle.