带旋转装置的空气分级机的分级机理及应用基础

The air flow and the air solid two phase movement characteristics in a turbo classifiers are analyzed by the dynamic equation of fluid motion combined with the features of intense circulating flow. It is pointed out that in the annular region the air motion in the turbo classifier is plane motion and a superposition of a quasi free vortex and a point sink, in the sense of time average flow. This flow pattern may lead to Tailer Column effect and from a uniform force field in the turbo classifier, resulting in an improvement in classifying efficiency and precision. Analying the classification process of the turbo classifier . The outer cylindyical periphery of the rotor cage is described as functioning as aerodynamic screen to clarify the operating principle of the vortex classifier. The mathematics model of aerodynamic screen had been established.Based on the classification process analysis of turbo classifier, the effects interior of an air turbo classifier is categorized into five subspaces. The categorization is confirmed by material experiments. The structures of three subspaces-- the main dispersing region, dispersing separate region , second separate region, were improved to obtain better classifying index. The measures to improve the dispersion of powder material and the uniformity of air flow field are put forward..Based on the fundamental concept of turbulent flow and the theory concerning the eddy frequency spectrum, the effects of various frequency sections in turbo classifiers on the dispersing of the powder aggregates and classifying precision are discussed. The authors point out that eddies of small scale and high frequency contribute to destroying the powder aggregates and improving the powder dispersing extent. This renders classifying precision improvement and an increase in efficiency. In order to modify the frequency spectrum of turbulent eddies, a device which was expected to increase the turbulent eddies of small scale and high frequency ,with the width of the annular region unchanged, was fitted in the annular region between the outside borderline of the rotor cage and the inside borderline of the baffle blades in the turbo classifier. The experiment results indicated an increase in the index d25/d75 of the classification precision from 0.71 and 0.62 to 0.80 and 0.76. The experimental of the width of the annular region indicated that a desirable classifying efficiency and precision index from the classifier with the ratio of the annular region width to the outer diameter of the material of the material distribution plate ranged from 0.098 to 0.121.. Based on the observations described, there will be a instruction to improve turbo air classifier and air classifier with a rotor inside.

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