为得到不同调和比例的生物柴油在炉膛内的燃烧过程、辐射换热能力、温度分布和燃烧后产物的浓度分布，并为研发新设备和优化已有的燃烧换热设备提供数据支撑，采用数值模拟的方法，针对生物柴油与石化柴油的混合燃料，在10%，30%，50%和100% 4种不同调和比例下研究了其在工业锅炉中的燃烧特性。计算结果表明：不同调和比例的生物柴油在炉膛内燃烧过程有明显的差异，随着生物柴油比例的升高，炉膛内燃烧中心的最高温度分别为2 093，1 970，1 622和1 704 K，火焰的形状有增大的趋势，火焰中心在炉膛内的相对位置也有向炉膛尾部移动的趋势，且B50和B100生物柴油的燃烧区域有不稳定燃烧现象的出现；烟气温度是影响炉膛内表面辐射换热能力的主要参数；不同调和比例生物柴油燃烧后对应的最高NOx浓度分别为：132，18.8，0.62和4.95 mg/m3，提高生物柴油的调和比例可以有效地降低炉膛的NOx的排放。

In order to obtain the combustion process,radiant heat transfer capacity,temperature distribution and concentration distribution of products after combustion of biodiesel with different blending ratios in the furnace,and provide data support for the development of new equipment and the optimization of existing combustion and heat exchange equipment,the combustion characteristics of the mixed fuel of biodiesel and petrochemical diesel in industrial boilers were studied by numerical simulation method under four different blending ratios of 10%,30%,50% and 100%.The calculation results show that there are obvious differences in the combustion process of biodiesel with different blending ratios in the furnace.With the increase of the proportion of biodiesel,the maximum temperature of the combustion center in the furnace is 2 093,1 970,1 622 and 1 704 K respectively.The shape of the flame tends to increase,and the relative position of the flame center in the furnace also tends to move to the tail of the furnace,moreover,there is unstable combustion in the combustion area of 50% and 100% biodiesel; flue gas temperature is the main parameter affecting the radiant heat transfer capacity of the inner surface of the furnace; the maximum NOx volume fractions corresponding to the biodiesel with different blending ratios after the combustion are 132,18.8,0.62 and 4.95 mg/m3 respectively.Increasing the blending ratio of biodiesel can effectively reduce the NOx emission in the furnace.

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