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采取端面预旋进风结构的煤粉低尘燃烧器，出口直径的大小对燃烧器内压力场、速度场分布影响很大，出口直径的大小决定中心回流区区域大小：进口叶片节圆直径的减小能使流场更对称，且能增大燃烧器头部环室回流率，有利于提高捕渣率；加同旋向一次风有利于增大燃烧器头部的环室回流率和中心回流率。
Pulverized coal dust burner with end pre-rotating air inlet structure, the size of the outlet diameter has a great influence on the pressure field and velocity field distribution in the burner. The size of the outlet diameter determines the size of the central reflow zone: Reducing the flow field to make more symmetrical, and can increase the burner head chamber reflux rate is conducive to raising the rate of capture slag; plus the same primary air circulation is conducive to increasing the burner head ring chamber reflux rate and the center Reflux rate.