面向深度调峰的超临界煤粉锅炉变负荷燃烧三维数值模拟  

Three-dimensional numerical simulation of variable load combustion of supercritical coal-fired boiler for deep peak load regulation

作　　者：袁来运 钟文琪[1] 陈曦[1] 李杰 刘国耀 田万军 Yuan Laiyun;Zhong Wenqi;Chen Xi;Li Jie;Liu Guoyao;Tian Wanjun(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;Datang Jiangsu Power Generation Co.,Ltd.,Nanjing 210011,China;Nanjing SCIYON Automation Co.,Ltd.,Nanjing 211102,China;China Datang Corporation Science and Technology Research Institute Co.,Ltd.,Beijing 100040,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096 [2]大唐江苏发电有限公司,南京210011 [3]南京科远自动化集团股份有限公司,南京211102 [4]中国大唐集团科学技术研究院有限公司,北京100040

出　　处：《东南大学学报（自然科学版）》2019年第3期535-541,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金重大资助项目(51390492)

摘　　要：为解决低负荷运行时燃煤锅炉稳燃性下降和NOx排放增加的问题,对一台660 MW超临界旋流对冲锅炉在低负荷(20%~60%额定负荷)下不同运行工况进行了三维数值模拟,并研究了低负荷下多种操作参数对锅炉稳燃性和污染物排放的影响.计算与分析结果表明:30%额定负荷运行时投运下层燃烧器,且一次风率为0.2、煤粉粒径为50μm时,NOx排放最少;当负荷进一步降低时锅炉稳燃性迅速下降,同时NOx排放量迅速增加;调整燃烧器运行方式、一次风率和煤粉粒径可以有效改善锅炉低负荷燃烧状况.在负荷低于30%额定负荷的深度调峰运行时,采用2台磨煤机、下层燃烧器运行,并适当降低一次风率和煤粉粒径可以提高燃煤锅炉的低负荷运行能力.A 660 MW supercritical swirling opposed boiler was simulated under the low loads (rated loads of 20% to 60%),aiming at solving the problem of decreasing combustion stability and increasing NOx emission of coal-fired boilers in the low load operation.The effects of operating parameters on the combustion stability and the pollutant emission of the boiler were studied.The simulation and analysis results show that NOx emission reaches its lowest when the lower burners are put into operation at rated load of 30%, as well as the primary air rate is 0.2 and the particle size of the pulverized coal is 50 μm .When the load is further reduced,the boiler combustion stability decreases rapidly,while the NOx emission increases significantly.The combustion performance can be improved effectively by adjusting the burner operation mode,primary air rate and pulverized coal particle size.It is suggested that two mills and lower burners should be used when the load rate is less than 30% in deep peak load regulation,and the primary air rate and pulverized coal particle size can be appropriately reduced to improve the operating performance of coal-fired boilers.

关 键 词：超临界锅炉 深度调峰 数值模拟 低负荷稳燃 NOX排放 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]