使用混合工质的新型电冷联产循环系统研究

Research on Combined Power and Cooling System Using Ammonia-Water Mixtures

利用氨 水混合物低沸点的特点 ,设计了以氨 水混合物为工质的电冷联产循环系统 .该循环系统可以利用 4 0 0～ 4 5 0K的低温热源 ,实现发电与制冷联合生产 ,整个循环系统的热效率比利用同样温度热源常规热力发电的热效率高出 7%左右 ,为低温太阳能、地热能、电厂废热的高效利用提供了一个新方法 .通过对整个系统的数值模拟 ,进一步分析了该联产系统中汽轮机初压、背压、热源温度、吸收器工作温度等参数之间的关系 .结果表明 ,汽轮机的初压增加及背压下降 ,会使系统的循环效率线性增加 。

A new combined thermal power and cooling system is developed using the characteristic of low boiling non azeotropic ammonia water mixtures. This cycle may produce power as well as refrigeration using relatively low temperature heat sources ranging from 400～450 K.The overall efficiency is 7% higher than the direct power generation with the same heat sources. Solar energy, geothermal and waste heat from power plant may be utilized efficiently. The relationship of the system parameters such as turbine inlet pressure, outlet pressure, temperature of heat source and absorber and the effect of these parameters on the cycle efficiency are analyzed through numerical simulation. The results show that higher initial pressure and lower exhaust pressure will increase the system thermal efficiency linearly, while increase of initial temperature will get higher efficiency first and than decrease gradually.