基于EBSILON的中低温槽式光热发电系统运行仿真与性能分析

EBSILON-based operation simulation and performance analysis for medium-low temperature trough photothermal power generation system

槽式聚光太阳能热发电系统适合气象资源较差的中低温热源能量回收。本文以中低温槽式聚光太阳能热发电全系统为研究对象,采用北京某地区典型年气象数据,对相互耦合的3个关键环节槽式聚光集热系统、储热系统、热功转换系统分别建立独立的数学模型,最终基于EBSILON仿真软件开展了"春分""夏至""秋分""冬至"4个节气日下系统的变工况运行特性研究,分析了机组发电输出功率、槽式聚光器光学转换效率、基本循环热功转换系统逐时效率和全系统光热转换效率等4项指标。结果表明:中低温槽式聚光太阳能热发电全系统在该典型年下,春分日的发电输出功率和基本循环热功转换系统逐时效率都较高;而秋分日槽式聚光器的光学效率和全系统的光热转换效率则表现较优。该研究结果可为中低温槽式光热发电机组的运行提供参考。

The trough concentrating solar thermal power generation system is suitable for energy recovery of medium and low temperature heat sources with poor meteorological resources.In this paper,the whole system of low-temperature trough concentrating solar thermal power generation is taken as the research object.Based on the typical annual meteorological data of a certain area in Beijing,the mathematical model of three key links of the trough-type concentrating heat collection system,heat storage system and thermal power conversion system was established.Finally,study on operating characteristics of the system under the four conditions of the solar terms "spring equinox","summer solstice","autumn equinox" and "winter solstice" was carried out based on the EBSILON simulation software,and the comprehensive performance including four indicators such as the generating output power of the unit was analyzed as well.The results show that,the output power of the typical year to end and the hourly efficiency of the basic cycle thermal power conversion system are both higher on the spring equinox day,while the optical efficiency of the trough concentrator and the photothermal conversion efficiency of the whole system are higher on the autumn equinox day.The research results can provide a reference for the operation of medium and low temperature trough type concentrating solar power plants.