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采用Fluent6.3软件,对福溪电厂600MW超临界机组W火焰锅炉的炉内热负荷分布状况进行了数值研究。研究结果表明:沿炉膛高度、深度以及宽度方向热负荷不均匀系数分别为0.6~1.6、0.94~1.08和0.78~1.13。烟气在上炉膛需绕流经过折焰角,受到向前的挤压,从而导致前墙热负荷高于后墙。燃尽风率增大时,下炉膛热负荷增大,上炉膛热负荷减小;沿宽度方向热负荷不均匀性增加;而沿深度方向热负荷不均匀性减少。卫燃带的增加,使得下炉膛热负荷减少,上炉膛热负荷增加;沿宽度方向热负荷不均匀性增加;而沿深度热负荷不均匀性减少。过量空气系数增加时下炉膛热负荷增加,上炉膛热负荷减少;沿宽度和沿深度的热负荷不均匀性都减少。煤粉细度变化对沿炉膛高度和深度方向热负荷分布影响很小,而沿宽度热负荷不均匀性随着煤粉变粗而减小。研究成果可作为W火焰锅炉燃烧优化调整和水冷壁安全运行的重要依据。
The Fluent6.3 software was used to study the distribution of furnace internal heat load of the 600MW supercritical unit in WF boiler of Fuxi Power Plant. The results show that the non-uniform coefficient of thermal load along the furnace height, depth and width are 0.6 ~ 1.6, 0.94 ~ 1.08 and 0.78 ~ 1.13 respectively. The flue gas flowed through the furnace through the flaring angle and was squeezed forward, resulting in a higher thermal load on the front wall than on the back wall. When the burnout wind rate increases, the lower furnace heat load increases, the upper furnace heat load decreases; the thermal load inhomogeneity increases in the width direction; and the thermal load inhomogeneity decreases along the depth direction. With the increase of the deflagration belt, the heat load of the lower furnace decreases, the heat load of the upper furnace increases, the heat load in the width direction increases, and the heat load inhomogeneity decreases along the depth. When the excess air ratio increases, the heat load of the lower furnace increases and the heat load of the upper furnace decreases. The thermal load nonuniformity along the width and the depth decreases. The variation of fineness of coal has little effect on the heat load distribution along the height and depth of the hearth, while the nonuniformity of heat load along the width decreases with the thickening of coal. The research results can be used as an important basis for optimizing the combustion of W flame boiler and the safe operation of water wall.