600 MW亚临界锅炉燃烧器低氮改造与运行优化
Low Nitrogen Modification and Operation Optimization of 600 MW Subcritical Boiler Burner
刘兵兵 1冯欣 2杨祖旺2
作者信息
- 1. 四川广安发电有限责任公司,四川 广安 638500
- 2. 西安格瑞电力科技有限公司,陕西 西安 710000
- 折叠
摘要
对A电厂 600 MW亚临界锅炉进行了燃烧器低氮改造.对 61#锅炉燃烧器的改造,在燃用实际煤种的前提下达到以下效果:明显改善了水冷壁高温腐蚀现象;改善屏式过热器超温现象,减温水量下降 10%以上;消除了燃烧器喷口以及四周水冷壁结焦的问题.对制粉系统进行调试实验,结果表明在 600 MW 负荷时可6 台磨煤机同时运行,且每台磨煤机的最大出力为 60 t/h;500 MW负荷时,在现有煤质下可 5 台磨煤机同时运行;燃烧系统改造后现场取样结果表明,炉渣碳质量分数为 3.06%,飞灰碳质量分数为 5.37%,均下降 10%以上,且在煤质条件一样的前提下,锅炉出口处NOx质量浓度由原先的 600～700 mg/m3 下降至 300～350 mg/m3,有效降低了脱硝装置的成本,实现了节能环保的目的;配煤燃烧时,新疆煤与本地煤种掺混质量比大于 1∶1 时,可有效防止结焦.因此该次改造具有良好的推广应用价值.
Abstract
The 600 MW subcritical boiler of a power plant was optimized for low nitrogen burner,and after the transformation of the 61#furnace burner,the following effects were achieved under the premise of burning actual coal:the high temperature corrosion phenomenon of the water wall was significantly improved;Improve the overtemperature phenomenon of screen superheater,and reduce the amount of temperature reduction by more than 10%;eliminates burner spouts and surrounding water wall coking.The debugging experiment of the milling system shows that 6 coal mills can be operated at the same time at 600 MW load,and the maximum output of each mill is 60 t/h.With a load of 500 MW,5 coal mills can be operated simultaneously under the existing coal quality.The on-site sampling results after the transformation of the combustion system showed that the carbon content of the slag was 3.06%,and the carbon content of fly ash was 5.37%,both of which decreased by more than 10%,and under the premise of the same coal quality conditions,the NOx mass concentration at the boiler outlet decreased from the original 600-700 mg/m3 to 300-350 mg/m3,which effectively reduced the cost of the denitration device and achieved the purpose of energy conservation and environmental protection,when coal blending is burned,when the blending ratio of Xinjiang coal and local coal is greater than 1∶1,it can effectively prevent coking.So the transformation has good promotion and application value.
关键词
燃烧系统优化/节能/制粉系统/NOxKey words
combustion system optimization/energy conservation/milling system/NOx引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据