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对于480 t/h以上的大型循环流化床锅炉,实际运行时,由于床层流化不均,风室内会出现不同程度的漏煤现象。为了改善床料的流化质量,文中采用多孔介质模型对布风板的结构进行了简化,模拟时采用三维双欧拉多相流模型,并结合颗粒动力学理论使方程封闭,研究了480 t/h循环流化床在不同布风板阻力下的流化特性,模拟结果表明,增大布风板阻力能有效改善煤层流化均匀性,减少风室漏煤。因此,大型循环流化床锅炉设计时,需要对布风板结构、开孔尺寸精心设计,合理增加布风板阻力。
For the large circulating fluidized bed boiler above 480 t / h, in actual operation, due to the uneven fluidized bed, different degrees of coal leakage will occur in the wind chamber. In order to improve the fluidization quality of the bed material, the porous media model is used to simplify the structure of the air distribution plate. In the simulation, a three-dimensional two-Euler multiphase flow model is adopted and the equations are closed by the particle dynamics theory. The effects of 480 t / h circulating fluidized bed fluidized bed at different resistance of the wind board, the simulation results show that increasing the resistance of the wind board can effectively improve the uniformity of coal seam fluidization and reduce leakage of air chamber. Therefore, the design of large-scale circulating fluidized bed boiler requires careful design of the air distribution structure and opening size to reasonably increase the resistance of the air distribution plate.