摘要
以某600 MW超临界对冲旋流燃烧锅炉组合式贴壁风系统为研究对象,采用数值模拟方法分析了贴壁风取风方式、风率和喷口风速等运行参数对水冷壁近壁区烟气中氧体积分数、锅炉NO_x排放质量浓度和未燃尽碳质量分数的影响。结果表明:组合式贴壁风可以显著改善对冲旋流燃烧锅炉左右两侧墙水冷壁近壁区气氛,高温腐蚀发生倾向性较大区域所占比例可减小至20%以下;综合考虑机组运行的经济性、环保性和安全性,模拟所得机组的最佳运行工况选取贴壁风风率为4.00%,前后墙贴壁风喷口风速为20 m/s,贴壁风的取风方式为从燃尽风取风。
Taking the combined closing-to-wall air system in a 600 MW supercritical opposed firing boiler as an object of study,numerical simulations were conducted to investigate the effects of closing-to-wall air intake mode,air rate and air velocity on the oxygen concentration in the flue gas close to the water wall,the boiler NO_x emission and the unburned carbon content,etc.Results show that the reductive atmosphere around both the right and the left side wall could be effectively improved by adopting the combined closing-to-wall air system,in which case,the proportion of the area with strong tendency to form high-temperature corrosion could be reduced to be less than 20%.Considering the economic,environmental and safety operation of the unit,the simulated optimal operation conditions are as follows:the closing-to-wall air rate is 4.00%,the nozzle velocity on front and rear wall is 20 m/s,while the closing-to-wall air is taken from the overfire air system.
作者
杨希刚
金保昇
YANG Xigang;JIN Baosheng(School of Energy and Environment,Southeast University,Nanjing 210096,China;Guodian Science and Technology Research Institute Co.,Ltd.,Nanjing 210023,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2019年第7期517-523,共7页
Journal of Chinese Society of Power Engineering
关键词
对冲旋流燃烧锅炉
贴壁风
高温腐蚀
还原性气氛
opposed firing boiler
closing-to-wall air
high-temperature corrosion
reductive atmosphere
作者简介
杨希刚(1975-),男,山东滨州人,高级工程师,硕士,主要从事火电厂技术监督管理及节能减排技术方面的研究。电话(Tel.):025-89620608,E-mail:yxigang@163.com。
