摘要
测量了7台不同炉型和燃烧器型式的600 MW、660 MW机组燃煤锅炉性能和NOx排放浓度,分析了锅炉结构和燃烧器型式对锅炉性能、NOx排放浓度的影响。数据分析表明,锅炉性能和NOx排放浓度与锅炉结构和燃烧器型式关系密切。大容量机组燃煤锅炉燃烧效率都比较高,但其NOx排放浓度差别很大。W型火焰锅炉燃烧贫煤燃烧温度高,过量空气系数大,其NOx排放浓度最高;燃用高挥发分烟煤的四角切圆燃烧锅炉NOx排放浓度最低;其它机组,采用不同的燃烧器型式和低NOx燃烧技术,燃烧的煤种也不同,锅炉NOx排放浓度介于两者之间,但差别很大。煤种变化、锅炉运行参数变化对锅炉性能和实际NOx排放浓度都有较大影响。
Influences of boiler structure and burner type on boiler performance and NOx emission are being analyzed based on a series of tests on 7 boilers （600 MW, 660 MW） with different structures and burner types. Results show that boiler performance and NOx emission have close relationship with boiler structure and burner type. Among all the coal-fired boilers tested, the ones for large power units have relatively high combustion efficiencies and been able to achieve relevant design values, but their NOx emissions vary a lot. The W-shape flame boiler produces the highest NOx emission due to the high combustion temperature and large excess air ratio resulted by burning lean coal; while the tangential firing boiler, which burn bituminous coal of high volatile content, produces the lowest NOx emission. NOx emission of other boilers, which adopt different structures, burner types and apply different technologies for reducing NOx emission, lies between the highest and lowest limit and differs a lot. That means, the coal category and boiler operation parameter exert great influence on boiler performance and NO emission.
出处
《发电设备》
2008年第6期467-472,共6页
Power Equipment
基金
国际科技合作重点项目(2004DFA07700)
