330MW四角切圆锅炉低NO_x优化改造数值模拟  

Numerical simulation of low NO_x optimization for a 330MW tangential boiler

作　　者：吕太[1] 吴红峰[1] 路昆 王泽民[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]华电电力科学研究院,浙江杭州310030

出　　处：《辽宁工程技术大学学报（自然科学版）》2015年第10期1190-1195,共6页Journal of Liaoning Technical University (Natural Science)

摘　　要：针对某电厂330MW四角切圆锅炉NOx排放质量浓度高、炉内结渣严重的问题,提出基于多空气分级低氮燃烧技术的燃烧器改造方案,运用FLUENT软件对改造前后锅炉燃烧状况进行数值模拟.分析计算和试验数据得出:改造后,浓相一次风反切对炉内燃烧有一定影响,煤粉气流对水冷壁冲刷减弱,结渣现象明显改善;煤粉着火稳燃得到强化,主燃区CO质量浓度增大,炉内还原性气氛增强;燃尽区下部形成的NOx还原区对降低NOx排放质量浓度有积极作用;炉内最高温度下降80℃左右,NOx排放质量浓度降幅达47%左右.For the problems that high NOx emission and severely slagging of a 330 MW tangential boiler, a solution was raised by using multi-air staged combustion technology of low NOx to optimize the boiler burner. Using FLUENT software, the combustion performance in boiler was simulated under rated condition of before and after modification. The results from calculation and experiment show that the reverse tangent of dense primary air has a certain influence in the boiler combustion, the phenomenon of the pulverized coal washing water wall and slagging was weakened; the ignition and stable combustion of the pulverized coal were strengthened, the concentration of CO and reducing atmosphere increased in primary combustion zone; which the reducing zone of NOx formed under the burning-out zone has the positive effect in reducing the NOx emission; it not only effectively reduced the maximum temperature by about 80℃ but also significantly reduced the NOx emission by about 47%.

关 键 词：锅炉 切圆燃烧 低NOX 空气分级 优化改造 数值模拟 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]