复合抛物面聚光器–光伏/光热与燃煤发电机组联合供能系统性能分析

Performance Analysis of CPC-PV/T Hybrid Electric-thermal Device Combined With Coal-fired Unit Power Generation System

设计出独立双层流道式和回路双层流道式结构的水冷式复合抛物面聚光器?光伏/光热(CPC-PV/T)电热联用装置,分析比较2种装置的特征,CPC-PV/T集热单元之间采用蛇形对冲式连接方式;提出将多个CPC-PV/T电热联用装置并联连接组成的CPC-PV/T预热系统辅助加热燃煤机组凝结水,以及作为扩容蒸发式太阳能蒸汽发生系统(VEESG)辅助燃煤机组联合热发电的预热段2种集成方式,针对2种集成方式研究其集成机制。结果表明,联合发电系统机组热经济性随CPC-PV/T进水流量的增加成线性递增趋势;其出水温度可达90℃以上,在一定进水流量范围内,CPC-PV/T热效率随进水流量的增加而降低,随辐射强度的增强而提高;CPC-PV/T电效率随进水流量的增加呈波形递增趋势,其平均电效率、热效率分别在13.4%、42%左右。与独立的光伏或光热系统相比,CPC-PV/T占地面积小、太阳能利用率高。

Two kinds of water-cooled CPC-PV/T electric- thermal devices including independent double fluidic channel device and loop double fluidic channel device was designed and both characteristics were analyzed. Pipelines connecting CPC-PV/T heat collecting units are serpentine hedging style. Two modes of integration were put forward. CPC-PV/T preheating system was used, which is connected by multiple CPC-PV/T electric-thermal devices in parallel for heating the condensate water of coal-fired unit. And CPC-PV/T preheating system waa used as the preheating section of auxiliary coal-fired thermal power generation unit of volume expanding evaporative steam generation system （VEESG）. And the integration mechanisms was studied which show that the thermal economy of the composite power system increases linearly with the increase of the inlet flow rate of the CPC- PV/T system and the temperature of outlet water can be up to 90℃; Within a range of water flow rate, the thermal efficiency of CPC-PWT system＇decreases with the increasing inlet water flow rate and increases with the increasing radiation intensity. The electrical efficiency of CPC-PV/T system increases in waveform with the increase of inlet water flow rate and the average electrical efficiency and thermal efficiency are about 13.4% and 42% respectively. Compared with photovoltaic or solar thermal systems, CPC-PV/T system has the advantages of small area and high utilization of solar energy.