有机朗肯循环系统变工况特性分析

Analysis of organic Rankine's cycle in the variable working condition

有机朗肯循环系统发电系统内部参数与外界环境紧密相关,热源参数的变化、冷却水温度的变化都会使得系统内部各个点参数改变,从而导致系统长期运行在非额定工况热效率低。该文以循环工质为R245fa的有机朗肯循环系统作为研究对象,通过建立蒸发器和冷凝器换热模型,得出有机朗肯循环系统在不同热源温度、不同冷却水温度下的最佳蒸发温度、凝结温度变化情况,从而获得蒸发温度、凝结温度与热源温度、冷却水温度之间的函数关系。在实际有机朗肯循环系统余热发电工程中,存在着很多不稳定因素,因此对有机朗肯循环系统变工况特性分析是非常有必要的,对于提高系统整体性能具有指导性意义。

Organic Rankine's cycle power generation system internal parameters closely related to the external environment, the change of heat source parameters, cooling water temperature fluctuations can cause various points within the system parameter change, resulting in power system operation for a long time in the rating system thermal efficiency is low. Based on cyclic working substance of R245fa organic Rankine's cycle as the research object, through the establishment of evaporator and condenser heat transfer model, it is concluded that organic Rankine's circulation in different heat source temperature, evaporation temperature, condensation temperature of cooling water temperature changes, thereby gaining evaporation temperature, condensation temperature and the function relation between the heat source temperature, cooling water temperature. In actual organic Rankine's circulation waste heat power generation project, there are many unstable factors, so the analysis of the organic Rankine's circulation the variable working condition characteristics is necessary, to improve overall system performance has guiding significance.