摘要
超临界二氧化碳(supercritical carbon dioxide,S-CO_(2))燃煤发电技术被视为可替代蒸汽朗肯循环的新型发电技术。该文针对1000MW的32MPa/620℃S-CO_(2)动力循环燃煤发电机组,进行S-CO_(2)锅炉创新构型设计,可实现锅炉效率94.6%,发电标准煤耗245.6g/(kW·h)。为更好的研究机组变工况下的运行性能,基于Aspen Plus平台,建立1000MW级S-CO_(2)动力循环燃煤发电机组变工况模型。结果表明:在变负荷过程中,低压透平的工质体积流量受影响较大;机组的全厂热效率会随着负荷的降低而降低;主工质温度和和再热工质温度偏差是影响机组热经济性的主要原因。研究结果对未来建设S-CO_(2)动力循环燃煤发电机组具有指导意义。
Supercritical CO_(2)(S-CO_(2))coal-fired power generation technology is considered as a new generation technology that can replace steam Rankine cycle power generation.Taking 32MPa/620℃,1000MW supercritical CO_(2) power cycle coal-fired unit as an example,the innovative configuration of S-CO_(2) boiler is designed,achieving a boiler efficiency of 94.6%and a coal consumption rate of 245.6g/kW·h.In order to study the operating performance of unit under off-design working condition,a variable working condition model of 1000MW S-CO_(2) power cycle coal-fired unit is developed,using Aspen Plus platform.The results show that the volume flow rate of working-medium in LPT is greatly affected in the process of variable load.The thermal efficiency of unit is decreased with decreasing of unit load.The difference between main working-medium temperature and reheat working-medium temperature is the main reason that affects thermal economy of units.The results and conclusion can provide a basis for the design of S-CO_(2) power cycle coal-fired units.
作者
陈璟
陈磊
周敬
朱萌
廖海燕
刘辉
许凯
向军
CHEN Jing;CHEN Lei;ZHOU Jing;ZHU Meng;LIAO Haiyan;LIU Hui;XU Kai;XIANG Jun(Guodian Electric Power Development Co.,Ltd.,Chaoyang District,Beijing 100101,China;State Key Laboratory of Coal Combustion(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China;CHN Energy New Energy Technology Research Institute Co.,Ltd.,Chaoyang District,Beijing 100024,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第17期6681-6687,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(U20A20303)
国家能源集团科技项目(GJNY2030XDXM-19-10.1)。
关键词
超临界二氧化碳
燃煤发电机组
再压缩布雷顿循环
变工况
煤耗
supercritical carbon dioxide
coal-fired power unit
recompress Brayton power cycle
off-design
coal consumption
