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为了防止大型电站锅炉炉内结渣,减轻高温对流受热面处烟气温度偏差,本文提出了二次风燃烧器喷口反切布置的同心圆燃烧方式。通过对炉内气相流动的冷模试验研究和数值模拟,单颗粒炉内运动的数值模拟和颗粒群在炉内运动的冷态试验研究结果表明:合理的二次风反切可在炉内形成“风包粉”燃烧方式,且使水平烟道内高温对流受热面处的气流速度和颗粒得到均匀分布,这对防止炉内结渣、减轻高温对流受热面热偏差起促进作用。
In order to prevent slagging in the large power station boiler and to reduce the temperature deviation of the flue gas at the high temperature convection heating surface, a concentric combustion mode of the countercurrent arrangement of the secondary air burner is proposed in this paper. Through the cold model experimental research and numerical simulation of the gas flow in the furnace, the numerical simulation of single particle furnace movement and the cold state test of the particle group moving in the furnace show that reasonable secondary air reverse cutting can form “ Wind-pack powder ”combustion mode, and the gas flow velocity and particles in the high-temperature convection heating surface in the horizontal flue are uniformly distributed, which plays a role in preventing slagging in the furnace and alleviating the thermal deviation of the high-temperature convection heating surface.