切圆燃烧锅炉运行调整对水冷壁贴壁气氛的影响Effect of Operating Regulation on Atmosphere near the Water Wall of a Tangentially Fired Boiler
茅建波,张晓龙,陈小波,郑建平,赵寅丰
MAO Jianbo,ZHANG Xiaolong,CHEN Xiaobo,ZHENG Jianping,ZHAO Yinfeng
摘要(Abstract):
为了解运行调整对切圆燃烧锅炉水冷壁高温腐蚀的影响,采用现场试验的方法对1台350MW超临界锅炉的水冷壁贴壁气氛分布特性进行了研究,得到机组负荷、燃烧器摆角、风箱与炉膛差压、运行O2体积分数等参数对水冷壁贴壁气氛的影响规律。结果表明:CFS(燃烧系统辅助风预置水平偏角)的设计实际运行效果较好,主燃烧器区域水冷壁贴壁还原性气氛较弱;还原区、燃尽区贴壁还性气氛强烈,H2S体积分数较高,水冷壁容易发生高温腐蚀;降低机组负荷、下摆燃烧器摆角、减小风箱与炉膛差压以及提高运行O2体积分数等运行调整可减弱水冷壁贴壁还原性气氛;提高运行O2体积分数对改善贴壁还原性气氛区域的分布效果不大;应综合考虑锅炉运行经济性、安全性、 NOX排放等因素合理调整锅炉运行。
In order to learn the effect of operating regulation on high-temperature corrosion over the water wall of tangentially fired boiler, field tests are conducted to study the characteristics of the atmosphere near the water wall of a 350 MW supercritical boiler, and the influence of unit load, burner tilt, differential pressure between windbox and furnace and operating O2 volume fraction on atmosphere near the water wall is concluded. The results show that the design of CFS(concentric firing system) has good operation effect and the reductive atmosphere near the water wall of the main burner is weak; atmospheres near the water wall of the reductive and overfire areas are strong, and the volume fraction of H2 S is high and the high-temperature corrosion over the water wall is easy to occur; the reductive atmosphere near the water wall can be reduced by means of reducing the unit load, swinging down the burner tilt, reducing the differential pressure between windbox and furnace and increasing the operating O2 volume fraction; increasing the operating O2 volume fraction has little effect on improving the distribution of reductive atmosphere area near the water wall. The boiler should be regulated reasonably in consideration of the factors of economy, safety, NOXemission and so on.
关键词(KeyWords):
超临界锅炉;切圆燃烧;高温腐蚀;还原性气氛;运行调整
supercritical boiler;tangential firing;high-temperature corrosion;reductive atmosphere;operating regulation
基金项目(Foundation):
作者(Author):
茅建波,张晓龙,陈小波,郑建平,赵寅丰
MAO Jianbo,ZHANG Xiaolong,CHEN Xiaobo,ZHENG Jianping,ZHAO Yinfeng
DOI: 10.19585/j.zjdl.201911016
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- 超临界锅炉
- 切圆燃烧
- 高温腐蚀
- 还原性气氛
- 运行调整
supercritical boiler - tangential firing
- high-temperature corrosion
- reductive atmosphere
- operating regulation