太阳能与燃煤机组混合发电系统的热经济性分析  

ANALYSIS ON THE THERMAL ECONOMY OF SOLAR AIDED COAL-FIRED ELECTRICITY GENERATION SYSTEM

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：《太阳能学报》2015年第3期624-629,共6页Acta Energiae Solaris Sinica

基　　金：重庆市自然科学基金重点项目(2009BA6067)

摘　　要：以某型300 MW机组为例,利用抛物面槽式集热器收集太阳能热量,提出7种太阳能与燃煤机组集成方案,并定义太阳能加热给水与燃煤机组混合发电系统的循环效率、太阳能热电转换率等评价指标,应用变热量等效焓降法计算理论,对原机组及不同集成方案进行热经济性能分析。结果表明:太阳能与回热系统混合发电,既能增加发电量,提高太阳能热电效率,又能降低纯太阳能发电投资成本,其代价是混合发电系统的热效率将下降;给出的所有集成方案中,取代1段抽汽方案产生的额外电能和太阳能热电转换率最大,标煤耗率和热耗率最小,为最佳混合方案。Seven solar aided coal-fired electricity 300 MW unit with a solar utilization system in which generation system schemes are firstly proposed by integrating a parabolic trough collectors were adopted, the evaluation index such as cycle efficiency and solar thermoelectric conversion efficiency of the systems was defined, and the thermal economical performance of the original unit and different integrated schemes was analyzed through the application of variable heat equivalent enthalpy drop method theory. The results showed that the hybrid power generation of solar energy and regenerative system both are capable of increasing power output, improving solar thermoelectric conversion efficiency, and can reduce the investment cost of pure solar power, but the price is that the thermal efficiency of hybrid power system will be decreased. Among all the inte extraction steam is replaced by solar heat is grated schemes discussed, the scheme in which the whole first stage regarded as the optimal integrated scheme, because whose additional electricity and solar thermoelectric conversion efficiency is maximum, and the standard coal consumption rate and heat rate is minimum.

关 键 词：太阳能 燃煤机组 混合发电 等效焓降法 热经济性 

分 类 号：TK51[动力工程及工程热物理—热能工程]