槽式太阳能辅助燃煤发电系统集成方式

Integration method of trough solar-assisted coal-fired power generation system

针对某600 MW超临界发电机组,提出3种槽式太阳能辅助燃煤机组发电(SAPG)系统的集成方式.第1种为太阳能场并联取代高压加热器,第2种为太阳能场高压串联取代高压加热器,第3种为太阳能场低压串联取代高压加热器.利用Matlab编程建立槽式太阳能辅助燃煤电厂发电的仿真模型,在功率增大模式(PB模式)下仿真计算不同的集成方式热力性能,对3种集成方式下系统的太阳能发电量、光电转换效率、标准煤耗率等指标进行对比分析.结果表明,SAPG系统的3种集成方式随着太阳法向直接辐照度EDNI的增大,太阳能引入规模达到峰值为192.37 MW,太阳能发电量为59.55 MW,光电转换效率达到20.10%,标准煤耗率最低为264.44 g/(kW·h).当EDNI≤482 W/m2时,低压串联的集成方式下太阳能发电量、光电转换效率、标准煤耗率等指标均优于高压串联及并联集成的方式;当EDNI≥482 W/m2时,并联集成方式的热力性指标均优于其他2种集成方式,高压串联的集成方式热力性能指标最低.

Three integration methods of the trough solar-assisted coal-fired unit power generation(SAPG)system were proposed for a 600 MW supercritical generating unit.The first one is the parallel connection of solar fields instead of high-pressure heaters,the second one is the high-pressure series connection of solar fields instead of high-pressure heaters,and the third one is the low-voltage series connection of solar fields instead of high-pressure heaters.Matlab programming was used to establish a simulation model for power generation in a trough solar-assisted coal-fired power plant.The thermal performance of the different integration methods was simulated and calculated under the power increase mode(PB mode).Comparative analyses of the system’s solar power generation,photovoltaic conversion efficiency,and standard coal consumption rate were conducted under the three integration methods.Results showed that the three integration methods of the SAPG system increased with the direct normal solar irradiance EDNI.The solar energy introduction scale reached a peak of 192.37 MW,the solar power generation capacity was 59.55 MW,the photovoltaic conversion efficiency reached 20.10%,and the standard coal consumption rate was the lowest 264.44 g/(kW·h).The solar power generation capacity,photovoltaic conversion efficiency,and standard coal consumption rate of the low-voltage series connection integration method are better than those of the high-voltage series connection and the parallel connection integration method when the EDNI≤482 W/m2.The thermal performance index of the parallel integration method is better than that of the other two integration methods when EDNI≥482 W/m2,and the thermal performance index of the high-voltage series integration method is the lowest.