水平浓淡分离技术在1000 MW双切圆燃煤锅炉的应用与数值模拟  

Application and Numerical Simulation of Horizontal Dense Thin Separation Technology in 1000 MW Double Tangential Pulverized Coal Fired Boiler

作　　者：陈鑫科 马仑[1] 方庆艳 张成[1] 陈刚[1] 毛睿 李源 张平安 赵鑫平 任利明 CHEN Xinke;MA Lun;FANG Qingyan;ZHANG Cheng;CHEN Gang;MAO Rui;LI Yuan;ZHANG Ping’an;ZHAO Xinping;REN Liming(State Key Laboratory of Coal Combustion(Huazhong University of Science and Technology),Wuhan,Hubei 430074,China;Rundian Energy Science and Technology Co.,Ltd.,Zhengzhou,Henan 450052,China)

机构地区：[1]煤燃烧国家重点实验室(华中科技大学),湖北武汉430074 [2]润电能源科学技术有限公司,河南郑州450052

出　　处：《广东电力》2022年第4期111-121,共11页Guangdong Electric Power

基　　金：国家重点研发计划政府间国际科技创新合作基金项目(2021YFE0107300);中国博士后科学基金项目(2019M652639)。

摘　　要：电站燃煤锅炉一次风管线弯折常导致煤粉输送出现浓淡不均,为此,采用数值方探究弯头来流方向对风量偏差与煤粉浓淡分离程度的影响,将弯管与百叶窗浓淡分离器对煤粉浓淡分离的综合结果作为1000 MW双切圆燃煤锅炉模型的边界条件开展数值模拟,并与理想煤粉浓淡分离工况进行对比。结果表明:弯管与百叶窗浓淡分离器对风量偏差影响较小;斜下方弯管所致煤粉颗粒浓度在水平方向的偏斜程度约为25%,百叶窗浓淡分离所致煤粉颗粒浓度在向火侧偏斜程度约为22%,弯管与百叶窗浓淡分离均对煤粉偏斜产生较强影响,在锅炉实际运行调试和整体数值研究中皆需重视;弯头来流方向与向火侧相同时将对燃烧器整体的煤粉浓淡分离产生一定削弱效果,在前墙、后墙与右墙会出现煤粉浓度增高现象,影响煤粉在炉内的燃烧与水冷壁的结渣特性。The bending of primary air pipeline of the coal-fired boiler in the power station often leads to uneven distribution of pulverized coal transportation.Therefore,this paper uses the numerical method to discuss the influence of the incoming flow direction of the elbow on the flow deviation of air and the dense thin separation degree of pulverized coal.It takes the comprehensive results of the separation of pulverized coal by the elbow and dense thin separator as the boundary conditions of the 1000 MW double tangential coal-fired boiler model to carry out numerical simulation,and compares with the ideal pulverized coal separation condition.The results show that the influence on the air volume deviation produced by elbow and the louver concentration separator is very small,the horizontal deviation of pulverized coal particles caused by the inclined lower elbow is about 25%,and the pulverized coal deviation caused by the concentration and dilution separation of the louver is about 22%.Both the concentration and dilution separation of the elbow and the louver have a strong influence on the pulverized coal deviation,which should be paid attention to in the actual operation and commissioning of the boiler and the overall numerical research.When the flow direction of the elbow is the same as that of the louver concentration separator,it will weaken the degree of separation of pulverized coal in the burner,and further affect the combustion of coals in the furnace and scorification characteristics of water wall.

关 键 词：燃煤锅炉 数值模拟 浓淡分离 燃烧特性 

分 类 号：TM621.2[电气工程—电力系统及自动化] TK227.1[动力工程及工程热物理—动力机械及工程]