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采用实验方法考察物料特性、入口气速、排气管直径、入口截面积4种因素对排气管最佳插入深度的影响。实验结果表明,排气管的最佳插入深度主要受粉料中位粒径和粒径分布的影响,中位粒径越小,包含的小粒径颗粒越多,最佳插入深度越大,而与其他3项参数无关。另外,插入深度在最佳位置附近变化时,效率波动不大,远离最佳位置后,效率大幅下降,并且在大排气管直径,大入口条件下,效率对插入深度更为敏感。短路流和内旋流二次分离的协同作用是形成以上现象的主要原因。
Experimental methods were used to investigate the influence of material properties, inlet gas velocity, exhaust pipe diameter and inlet cross-sectional area on the optimal insertion depth of the exhaust pipe. The experimental results show that the optimal insertion depth of the exhaust pipe is mainly affected by the median particle size and the particle size distribution of the powder. The smaller the median particle size, the larger the small particle size contained, the better the insertion depth. Has nothing to do with the other three parameters. In addition, the insertion depth varies little around the optimal position with little change in efficiency, drastically reducing efficiency away from the optimal position, and efficiency is more susceptible to insertion depth at large exhaust pipe diameters and large inlet conditions. The synergy of short-circuit flow and secondary separation of internal swirl is the main reason for the above phenomenon.