槽式太阳能辅助生物质热电联产系统热力学性能分析

Thermodynamic Performance Analysis of a Parabolic Trough Solar-assisted Biomass-fired Cogeneration System

可再生能源互补热电联产系统在区域综合能源利用领域具有广阔的应用前景。提出了一种槽式太阳能辅助生物质热电联产系统,利用中低温槽式太阳能加热导热油,驱动吸收式热泵给热网水预加热,在生物质燃料与供热量保持恒定的条件下节省采暖抽汽、增加功率输出。采用EBSILON Professional软件对案例机组和集成系统进行建模仿真,在此基础上分析了系统能流与㶲损等热力学特性。结果表明:设计工况下可产生1.78 MW·h的太阳能发电量,光电效率为20.06%,光电转换㶲效率可达到21.60%。选取5个典型日探讨不同辐照条件下的系统性能,结果发现3月21日的太阳辐射与系统性能均为最优。对整个供热季进行逐时仿真分析,可知供热期5个月产生太阳能发电量共计1124.30 MW·h,平均光电效率为16.49%。

The integration of renewable energy combined heat and power system has broad application prospects in the field of regional comprehensive energy utilization.This paper proposed a parabolic trough solar-assisted biomass-fired cogeneration system.The system uses medium and low temperature trough solar energy to heat the thermal oil that drives the absorption heat pump to preheat the supply-water,while the biomass fuel and heat output keep constant.The extraction steam for heating is decreased while power generation is increased.The EBSILON professional software was used to model and simulate the case plant and integrated system,and on this basis,the thermodynamic characteristics of energy flow and exergy loss of the system were analyzed.The results show that,under the design conditions,1.78 MW·h of solar power can be generated,the solar-to-electricity efficiency is 20.06%,and the solar-to-electricity exergy efficiency can reach 21.60%.Five typical days were selected to explore the performance under different radiation conditions.We found that the solar radiation and system performance on March 21st are both the best.A time-by-hour simulation analysis was conducted for the entire heating season.A total of 1124.30 MW·h of solar power is produced in the five-month heating period with an average solar-to-electricity efficiency of 16.49%.