600 MW 超临界旋流燃烧烟煤锅炉NOx排放特性试验

doi:10.11930/j.issn.1004-9649.2012.3.62.5

摘要/Abstract

摘要： 针对某厂1台600 MW超临界低NO_x轴向旋流燃烧烟煤锅炉特点,通过变工况（氧量、不同层燃烧器风量分配方式、二次风比率、二次风旋流强度、三次风旋流强度、同层燃烧器风量分配方式和负荷等）试验,分析了锅炉NO_x排放特性。试验结果表明：对于燃用烟煤的采用低NO_x旋流燃烧器的锅炉,运行氧量、燃尽风份额、锅炉负荷及同层燃烧器风量分配方式是NO_x排放的主要影响因素。为控制NO_x排放,保持锅炉原有热效率,燃烧调整的原则为：（1）在保证锅炉运行安全的前提下应尽量采用低氧燃烧;（2）采用大比例的燃尽风份额;（3）运行负荷不应过低;（4）同层燃烧器风量分配采用双峰方式。

关键词: 超临界锅炉, 旋流燃烧器, NOx排放, 烟煤, 飞灰碳质量分数, 燃烧调整

Abstract: NO_x emissions from a 600 MW supercritical boiler with swirl burner were investigated by performing a serial of tests such as changing O₂ concentration, air-distribution of different level burners, secondary air ratio, secondary and tertiary air swirl strength, air-distribution of the burners in same level and boiler load. The test results show that for the bituminous coal fired boiler with swirl burner, the O₂ concentration, over fire air （OFA） ratio, boiler load and air-distribution mode of the burners in same level are the main factors affecting NO_x emissions. In order to reduce NO_x emissions and keep higher boiler efficiency, the following principles about combustion adjustment should be obeyed: （1） the O₂ concentration should be kept in the premise of ensuring safe operation of boiler as lower as possible;（2） large proportion of OFA should be adopted; （3） boiler load should not be too low; （4） two-peak air distribution mode should be taken among the same level burners.

Key words: supercritical boiler, swirl burner, NOx emissions, bituminous coal, carbon content in fly ash, combustion adjustment

中图分类号:

岳峻峰, 秦鹏, 邹磊, 梁绍华, 张恩先, 黄磊. 600 MW 超临界旋流燃烧烟煤锅炉NOx排放特性试验[J]. 中国电力, 2012, 45(3): 62-67.

YUE Jun-feng, QIN Peng, ZOU Lei, LIANG Shao-hua, ZHANG En-xian, HUANG Lei. Experimental study on the characteristics of NO_x emissions from 600 MW supercritical bituminous coal fired boiler with swirl burner[J]. Electric Power, 2012, 45(3): 62-67.

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https://www.electricpower.com.cn/CN/Y2012/V45/I3/62

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