光煤互补发电系统变工况能势匹配分析

Energy Potential Matching Analysis of Solar-aided Coal-fired Power Plant UnderOff-design Conditions

光煤互补发电是应对能源结构多元化转型的有效方案,不同工况下系统多过程能势匹配是提高光煤互补发电系统效率的关键。本文建立了其能势匹配分析模型,研究光煤互补发电系统变工况过程能质传递和能势匹配规律,发现了不同工况下光煤流量分配比增加使太阳能集成子系统?损失增加,光电转换?效率有突降和最大值。100%THA额定光照下光电转换?效率最高为33.11%。因此调节光煤流量分配比是提高系统能势匹配程度的关键,并获得了不同工况下的优化调控策略。

Solar-aided coal-fired power plant(SACFPP)is an efficient solution to deal with the diversified transformation of energy structure.The energy potential matching of SACFPP under different operation conditions is the key of improving the efficiency of the SACFPP.This study develops the analysis model of SACFPP energy potential matching.The regulations of energy quality transferring and energy potential matching are studied under off-design operation processes of SACFPP.It is found that increasing feedwater ratio to trough collector system leads the exergy destruction of the solar integration subsystem increasing under different operation conditions,and the solar-to-electricity exergy efficiency can decrease immediately and has the maximum value.The highest solar-to-electricity exergy efficiency is 33.11%under 100%THA with rated direct normal irradiance.Therefore,adjusting the feedwater ratio to trough collector system is the key of enhancing the degree of SACFPP energy potential matching.This study also obtains the optimal regulation and control strategies under different operation conditions.