槽塔结合太阳能辅助燃煤发电机组性能分析

Performance Analysis on a Solar Aided Coal-Fired Power Generation System with Simultaneous Integration of Trough and Tower Solar Collectors

目前化石能源短缺,环境污染日益严重,太阳能作为一种清洁可再生的能源,以其储量巨大、便于获取、无污染的优势,获得广泛的关注和发展。以国内某1000MW超超临界机组作为基准系统,提出了一种同时集成槽式、塔式太阳能集热子系统的新型太阳能辅助燃煤发电系统,分析了系统的节煤量、光电效率、锅炉热效率,同时对集成系统的经济成本进行了分析。结果表明:该新型集成系统比传统燃煤电站具有更好的热力学性能,可以最大限度地利用太阳能,THA工况下集成系统的节煤量约9g/(kW·h)。随太阳能取代比例的增大,集成系统的光电效率最大为25.55%,太阳能侧平准化度电成本为0.81元/(kW·h),低于目前的纯光热电站上网电价1.15元/(kW·h),具有明显的经济优势。

Due to the increasingly severe fossil energy shortages and environmental pollutions,as a type of clean and renewable energy sources,solar energy has drawn wide attentions and been intensively developed thanks to its benefits of being abundant,easy to use and non-polluting.In this paper,a new solar energy aided coal-fired power generation system is proposed which integrates trough and tower solar field into a typical 1 000 MW coal-fired power plant.Then the topics are analyzed such as the amount of coal saving,the solar-to-electricity conversion efficiency,and the boiler thermal efficiency of this system as well as the economic expense of the new system.From the results the new system has exhibited better thermodynamic performance than the traditional coal-fired power generation system such that the solar energy can be utilized maximally.Under the THA condition,the standard coal consumption rate of the new system is reduced by 9 g/(kW h).With the increase of the percentage of feed water heated by solar energy,the highest solar-to-electricity efficiency of the new system can rise up to 25.55%.Moreover,the levelized cost of electricity of the solar energy in the new system is 0.81 yuan/(kW h),lower than 1.15 yuan/(kW h) of pure solar thermal power station.Apparently the new system has shown better economic performance.