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为了降低410 t/h电站煤粉锅炉的NO_x排放,在实炉上进行了热态试验,在最上层二次风喷口的上方装设了分离式燃尽风(SOFA)喷口。试验结果表明,投入分离式燃尽风SOFA后,炉内形成了良好的空气分级燃烧工况,显著降低了NO_x的排放浓度,最高降低了43.4%。二次风缩腰型配风方式相较于宝塔型配风方式,更有利于降低NO_x排放浓度。另外,投入燃尽风后,经过燃烧调整主蒸汽温度的变化可控制在3℃以内,锅炉排烟温度变化不明显,因此,燃尽风对机组运行影响不大,可充分保持锅炉机组原有的其它性能的稳定性。实炉尺度的热态试验数据为同类型的低NO_x燃烧技术提供了重要的工程实践依据。
In order to reduce NO_x emissions from pulverized coal fired boilers at 410 t / h, a thermal test was carried out on a real furnace, and a separate SOFA nozzle was installed above the top secondary air nozzle. The test results show that, after putting into separate SOFA, a good air staged combustion condition is formed in the furnace, which significantly reduces the concentration of NO_x emissions by a maximum of 43.4%. Compared with the pagoda type air distribution method, the secondary air-reduced waist type air distribution is more conducive to reducing the NO_x emission concentration. In addition, after the combustion air is put into operation, the temperature of the main steam after combustion can be controlled within 3 ° C, and the change of the boiler exhaust temperature is not obvious. Therefore, the combustion air has little effect on the operation of the unit, The stability of other performance. The real-scale thermal test data provide important engineering practice basis for the same type of low NOx combustion technology.