太阳能辅助燃煤发电系统经济性分析

Economic Analysis of a Solar Aided Coal-fired Power System

以某670 MW超临界火电机组在100%THA下的设计参数为基准,针对槽式太阳能集热场与燃煤机组回热系统三种方案进行了经济性分析,并比较了拉萨、银川和北京的太阳辐射强度及集热场导热油出口温度对太阳能发电成本的影响。结果表明:随着导热油出口温度的增加,太阳能发电成本先增大后减小;三种方案均提高了机组的输出功率及热经济性,太阳能集热场与1号高压加热器并联方案的发电成本最低、经济性最好、实用性最强。

Based on the design parameters of a 670 MW supercritical coal-fired power unit under 100% THA operating condition, an economic analysis was conducted on three schemes for the connection between solar collector and heat recovery system of the coal-fired power unit, while the factors influencing the levelized energy cost （LEC） of solar power generation were comparatively analyzed, such as the solar radiation intensity in Lhasa, Yinchuan and Beijing, as well as the outlet temperature of heat transfer oil in the solar collector, etc. Results show that the LEC increases firstly and then decreases with the rise of outlet temperature of heat transfer oil; besides, all the three schemes can improve the power output and thermal economy of the unit, among which, the scheme of solar collector in parallel connection with No. 1 high pressure heater is the most economical and practicable one, due to its lowest LEC.