基于R600a的低温余热发电系统实验研究

Experimental Study of Low Temperature Waste Heat Power Generation System Based on R600a

热转换效率是余热发电系统的重要指标,如何提高余热发电系统的热转效率是余热发电系统的研究重点。针对低于350℃的低温余热,结合工程的实际状况,选择了有机工质R600a作为余热发电系统的循环工质,同时搭建了低温余热发电系统。通过理论分析了发现循环工质的过热度存在一个最佳值,当循环工质的过热度处于最佳值时,系统换热效率最大,并找到了控制循环工质的过热度的方法。在实验中,改变工质泵的频率观察循环工质的过热度、蒸发器压力、涡轮机转速、发电机电压和电流的变化。通过实验找到使过热度为最佳值的频率,此频率下的系统换热效率最高。

Heat transfer efficiency is an important indicator of the waste heat power generation system and how to im- prove it is the focus of waste heat power generation system. In consideration of project actual situation, an organic refrig- erant Rr00a is selected as working fluid of the waste heat power generation system in dealing with low temperature waste heat below 350 ~C and then a low -temperature waste heat power generation system is build. Theoretical analysis indi- cates that there exists an optimum superheat value of the working fluid. When the fluid is working at the best superheat value, the maximum heat transfer efficiency will be reached. And method to control the superheat of the working fluid is found. By changing the frequency of refrigerant pump, the superheat of the working fluid, the variation of evaporator pressure, turbine speed and the voltage and current of generator are observed. The frequency corresponding to the best superheat value, which leads to the maximum heat transfer efficiency, is acquired in experiment.