本文给出一种弯管和文丘里管组合结构的新型浓淡煤粉燃烧器,并分别对弯管、文丘里管和这种弯管和文丘里管组合结构燃烧器内的气固两相流动进行了数值模拟。采用Euler-Lagrange方法和离散相模型（DPM）研究气固两相流动,气相湍流采用分离涡（DES）模拟方法,固相湍流采用离散随机游动（DRW）模型。结果表明,这三种结构对10μm的小颗粒分离作用都不好,而对于大于50μm的颗粒来说,弯管和文丘里管的组合结构不仅可以实现浓淡分离,而且高浓度区域不贴壁。
This paper investigates a new rich-lean pulverized coal burner combined elbow and Venturi tube.The gas-solid two-phase flow inside elbow,Venturi tube and this new structure are simulated numerically.The Euler-Lagrange method and Dispersed Phase Model（DPM） are adopted in the studies of gas-solid two-phase flow.The Detached-eddy-simulation（DES） approach is involved in the calculation of turbulence dispersion of gas phase.The Discrete random walk model（DRW） is used in the turbulence of solid phase.The results show that,for the particles of 10μm,the effect of rich-lean separation of three types of structure is unobvious.For the particles with a diameter larger than 50μm,this new structure burner can achieve rich-lean separation.In addition,the area of high concentration does not adhere to the wall.
参考文献
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