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为了研究二次风配风方式对NO x生成的影响,针对某电厂660 MW超超临界旋流燃煤锅炉,利用Ansys软件数值模拟研究了二次风配风方式对NO x生成规律。数值模拟的结果与现场实际情况较吻合,验证了数值模拟结果的有效性,主要结论有:炉膛燃烧器区域是NO x的主要生成区;在第1层和第2层燃烧器之间区域NO x浓度较高,然后沿炉高方向NO x浓度逐渐降低;随着燃尽风量的增加,炉内高度方向各个截面的NO x平均浓度降低;随着燃尽风量增加,炉膛出口截面NO x浓度逐渐降低,但下降量逐渐减少。
In order to study the effect of secondary air distribution on NO x generation, a numerical simulation of the distribution of NO x by secondary air with 660 MW ultra-supercritical coal-fired boilers was carried out using Ansys software. The results of numerical simulation are in good agreement with the actual situation in the field, which verifies the validity of the numerical simulation results. The main conclusions are as follows: the burner zone in the furnace is the main NO x generation zone; NO and the NOx concentration gradually decreases along the height of the furnace. With the increase of the air volume, the average concentration of NO x in each section in the furnace height decreases. With the increase of the combustion air volume, the NO x concentration in the outlet section of the furnace Gradually decreased, but the amount of decline gradually decreased.