太阳能与燃煤机组混合发电方式的热经济性研究  

Study on Thermal Economy of Solar-Coal Hybrid Power Generation Units

作　　者：唐强[1] 曹伟伟[1] 张力[1] 崔鹏飞[1] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处：《动力工程学报》2013年第11期895-901,共7页Journal of Chinese Society of Power Engineering

基　　金：重庆市自然科学基金重点资助项目(2009BA6067)

摘　　要：阐述了分别从锅炉蒸发受热面、高压加热器汽侧和汽轮机低压缸引入太阳热能与燃煤机组进行混合发电的3种集成方案,定义了太阳能热电转换率、单位时间节煤量及太阳能热贡献率等评价指标,并以某300 MW燃煤机组为例,应用变热量等效焓降法计算理论对3种太阳能与燃煤机组混合发电集成方案的热经济性指标进行了计算和比较,确定了混合发电的最优集成方式,并对其经济性进行了初步分析.结果表明：混合发电集成方案2-1（取代2号高压加热器抽汽）的热经济性指标、运行安全性和稳定性均较好,因此选取方案2-1作为混合发电最优集成方案;太阳能的单位发电成本为0.63元/（kW·h）,低于单纯太阳能发电站的0.75～1.85元/（kW·h）.Three integrated modes of solar-coal hybrid power generation systems were proposed,in which the solar energy was introduced respectively at the place of boiler evaporating heating surface,extraction side of high pressure heater,and the low-pressure cylinder of steam turbine.Following evaluation indexes were defined,such as the solar thermoelectric conversion efficiency,the amount of unit coal saving and the thermal contribution rate of solar energy,etc.Taking a 300 MW power unit as an example,the thermal economy of three integrated schemes was calculated and compared using equivalent enthalpy drop method,after which the optimal integrated mode of hybrid power generation was determined,together with a preliminary analysis on its thermal economy.Results show that the thermal economic indexes,the operation safety and stability of scheme 2-1 are relatively good among the three schemes,which therefore is regarded as the optimal integrated mode.In the hybrid power generation mode,the unit cost of solar power generation is 0.63 RMB/（kW · h）,being less than the cost 0.75-1.85 RMB/（kW · h） under pure solar energy power generation mode.

关 键 词：太阳能 燃煤机组 混合发电 热经济性 

分 类 号：TK51[动力工程及工程热物理—热能工程]