中低温地热发电系统的研究

摘要

Basing on mid-low-temperature heat resource, a power system is developed using the characteristic of low boiling non-azeotropic ammonia-water mixtures. This cycle may produce power using low temperature heat resource rang from 300-500 K. The mass fraction of basic working fluid ammonia-water is 50% and 60%. Evaluated with The First Law of Thermodynamics, the simulation results show that the energy efficiency is 10.4%. Additionally, the effect of out pressure of turbine and heat resource temperature on the energy efficiency is studied. The novel cycle exploits a new way for utilizing the mid-low temperature heat efficiently.%针对中低温地热资源和工业余热资源,提出了一种以氨水混合溶液作为工质的动力循环系统.该系统可利用300～500 K的中低温地热资源,基础循环工质为50％和60％的氨水溶液.模拟计算表明,该循环系统的理论热效率为10.4％,热力学完善度为73.4％.文章还进一步分析了汽轮机背压和热源温度对循环系统热效率的影响.该研究为有效利用中低温余热资源提供了借鉴和参考.