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本文针对超临界循环流化床锅炉一次风风箱系统内部的空气流动特性,包括进气管、风箱内部及一次风通过布风板的流动特性,基于FLUENT计算平台结合多孔介质模型进行了数值模拟。针对三种不同进风结构,即底部进风、侧面进风和后侧进风模式进行了分析比较。为准确模拟布风板压降损失同时又减少计算量,利用多孔介质模型模拟一次风通过布风板的压降。综合分析比较三种进风结构下流化床系统内部速度、压力和湍动能分布特性,给出了最佳进风结构。研究结果对超临界循环流化床锅炉开发设计和大型化具有一定的理论指导意义。
In this paper, the air flow characteristics of the primary air bellows system of supercritical circulating fluidized bed boiler, including the flow characteristics of the air intake pipe, the windbox and the primary air passing through the air distribution plate, are numerically simulated based on the FLUENT platform and the porous media model. For the three different structures into the wind, that is, the bottom of the wind, the side into the wind and rear air intake mode were analyzed and compared. In order to accurately simulate the loss of pressure drop in the distribution board and reduce the computation load, the pressure drop of primary air through the distribution board is simulated by the porous media model. Through comprehensive analysis and comparison of the distribution characteristics of velocity, pressure and turbulent kinetic energy inside the fluidized bed system under the three inlet structures, the optimal inlet structure is given. The research results have some theoretical significance for the development, design and enlargement of supercritical circulating fluidized bed boiler.