根据气粉流的连续方程、动量方程和能量方程等基本关系式 ,建立了描述等直径喷嘴中气粉流行为的微分方程组。采用马赫数检验法确定等直径管中气粉流的临界管长 ,并通过数值计算结果讨论各种因素对气粉流壅塞现象的影响 According to the basic relation of continuous flow equation, momentum equation and energy equation of gas flow, the differential equations describing the behavior of gas flow in nozzles with equal diameter were established. The Mach number test was used to determine the critical tube length of the gas flow in the equal-diameter tube. The effects of various factors on the gas-plugging phenomenon were discussed by numerical results