660MW高水分褐煤锅炉超低负荷运行特性研究  

Investigation on operating characteristics of a 660 MW high moisture lignite-fired boiler under ultra-low load operating conditions

作　　者：李子祥 张启超 乌晓江[1] 叶妮娜 许芸 张忠孝[1] LI Zixiang;ZHANG Qichao;WU Xiaojiang;YE Nina;XU Yun;ZHANG Zhongxiao(School of Mechanical and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Energy Construction Engineering Design and Research Co.,Ltd.,Shanghai 200135,China;Science and Technology Research Institute Co.,Ltd.of CHN ENERGY,Nanjing 210046,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]上海能源建设工程设计研究有限公司,上海200135 [3]国家能源集团科学技术研究院有限公司,南京210046

出　　处：《热力发电》2024年第5期82-92,共11页Thermal Power Generation

基　　金：清洁高效燃煤发电与污染控制国家重点实验室开发课题(D2021FK058);国家重点研发计划项目(2022YFB2403200)。

摘　　要：为揭示大容量高水分褐煤机组的超低负荷运行特性及性能优化方式,基于建立并验证的燃煤锅炉燃烧模型,研究了33%最大连续额定负荷下燃烧器运行方式对660 MW高水分褐煤锅炉炉内燃烧、传热及NO_(x)转化特性的影响。结果表明:超低负荷下炉内仍可形成良好组织的流动及燃烧场,但锅炉综合性能显著下降,如燃烧温度及受热面吸热量显著降低、炉膛出口NO_(x)排放增加等;运行4层燃烧器时投运连续的下、中间组或中间、上组燃烧器,可有效防止燃烧、传热过程的显著恶化及NO_(x)排放的明显增加;燃烧器投运层数影响锅炉综合性能,运行2层燃烧器时炉内剧烈燃烧区域过于集中,不利于维持较高的燃烧温度及传热强度,炉膛出口NO_(x)排放升高。研究结果揭示了超低负荷下燃烧器投运位置及层数对660 MW高水分褐煤锅炉综合性能的影响,可为大规模可再生能源电力并网背景下高水分褐煤机组参与深度调峰的运行调整及优化提供指导。To unveil the ultra-low load operating characteristics and performance optimization method of large-scale units burning high moisture lignite,the influences of burners operating scheme under 33%BMCR condition on the coal combustion,heat transfer and NO_(x) transformation characteristics of a 660 MW unit utility boiler were investigated,based on an established and validated simulation model of coal-fired boiler.The results show that,well-organized flow and combustion field can still be formed inside the furnace under ultra-low load condition,but the overall boiler performance deteriorates evidently,such as obvious decreases in combustion temperature and heat transfer intensity,and increase in NO_(x) emission at outlet of the furnace.When 4 layers of burners are in-service,continuous lower-middle groups or middle-upper groups of burners should be put into operation,to prevent the significant deteriorations of combustion and heat transfer processes and the significant increase in NO_(x) emissions.The number of in-service burners layers significantly affects the overall boiler performance.When there are only two layers of burners in-service,the intense coal combustion area is too concentrated,which is not conducive to maintaining a high combustion temperature and heat transfer intensity,and NO_(x) emissions at the furnace outlet increase at the same time.These findings reveal the influences of burner operating scheme under ultra-low load condition on the overall performance of a 660 MW lignite boiler,which can provide guidance for deep peak shaving operation adjustment and optimization of coal-fired units in the context of large-scale renewable energy power grid connection in the future.

关 键 词：褐煤 超低负荷 燃烧器位置 燃烧器层数 锅炉性能 

分 类 号：TM621.2[电气工程—电力系统及自动化]