蒸发温度对低温工业余热有机朗肯循环发电系统影响

Effect of Evaporation Temperature on the Low Temperature Waste Heat of Industrial Organic Rankine Cycle Power Generation System

有机朗肯循环(Organic Rankine Cycle)发电技术是一项将低品位热能有效转换为电能的热回收技术,本文以热力学第一定律为基础,研究蒸发温度对有机朗肯循环系统循环热效率、热回收效率等热力性能的影响。研究发现:系统热效率和热回收效率随蒸发温度的提高而增加,且增加速率越来越小;在考虑有机朗肯循环系统热效率及热回收效率的前提下,提高蒸发温度对有助于提高系统热效率,最佳蒸发温度确定还需要考虑热源温度、工质的临界温度、系统耐压程度和工质泵耗功。

Organic Rankine Cycle（ ORC） generating technology is a low-grade heat recovery technology. It can effectively convert the low-grade heat into electrical energy. Based on the first law of thermodynamics,the effect of evaporation temperature on the thermal efficiency and thermal recovery efficiency of ORC system was studied. The thermal efficiency and heat recovery efficiency of the system increase with the increase of evaporation temperature,and the rate of increase was smaller. Considering the efficiency of thermal efficiency and heat recovery of ORC system,increasing evaporation temperature is helpful to improve the thermal efficiency of the system. Optimum evaporation temperature is needed to consider the heat source temperature,refrigerant temperature,system pressure and critical degree of refrigerant pump power.