太阳能有机朗肯循环发电系统分析

为高效利用太阳能,提出了太阳能平板集热器与有机朗肯循环相结合的发电系统。本文从太阳能低温发电系统的基本原理、工质选择及系统组成部分入手,分析了影响系统循环效率的因素。发现具有较大潜热与显热之比的干性或等熵有机工质适合本发电系统,并且膨胀机和冷凝器对系统循环效率影响较大。采用增加内部热交换器的再热循环、抽汽回热循环可以降低冷凝器的冷凝负荷,选择合适的再热度、抽汽量及抽汽压力可以提高系统循环效率。

Analysis for Solar Power Generation System of Organic Rankine Cycle

A power generation system of solar fiat plate collector combined with organic Rankine cycle is proposed in order to use the solar energy efficiently.The factors that influence the circulation system efficiency are analyzed by the basic principles of solar power system at low temperature,working fluid selection and system components.Both the dry and isentropic organic working fluid with bigger ratio of latent heat to sensible heat is suitable for the power system,and expander and condenser have a greater influence on the cycle efficiency of the system.Cooling load of the condenser can be reduced by adding internal heat exchanger of the reheating cycle and regenerative extraction cycle.In addition,the cycle efficiency of the system could be improved by electing the appropriate reheat degree,extraction volume and extraction pressure.