Study of small-size inertial louver-countercurrent dust collector

Abstract

The diagram of a small-sized inertial dust collector of grain cleaning machines is presented. The dust collector contains an inlet pipe, two louver-countercurrent cleaners, a sedimentary chamber, an air outlet channel, and a dust removal device. Reducing the overall dimensions of the dust collector in height is achieved by making the louver separator L-shaped and dividing its vertical section into two, having a common inlet pipe and one sedimentation chamber. The air outlet channel is located between the louver surfaces. Experimental studies to determine the main design and technological parameters were carried out on a model with a width of 0.3 m using the methods of single-factor and multi-factor experiments. The influence of the main structural and technological factors of the dust collector on the efficiency of air purification and hydraulic resistance is studied. Adequate regression equations for these processes with a probability of 0.95 are obtained. The optimal design and technological parameters of a small-sized louver-countercurrent dust collector are: the depth of the inlet pipe is 0.25 m, the horizontal section length of the louver grid of 0.4 m, the depth of the inlet pipes of the vertical louver separators 0.08 m, the length of the vertical louver grids of 0.4-0.5 m, the height of the output window louver and counter-current separators 0.04-0.05 m and 0.045-0.055 m, the depth of the sedimentation chamber 0.8 m, the airflow rate at the inlet to the dust collector 7.5-9.0 m•s -1 . With these combinations of parameters, the effect of air purification in laboratory conditions was 95.0-97.5% with a hydraulic resistance of the dust collector no more than 150 Pa. At the same time, the height of the dust collector decreased by 0.4-0.5 m. In real operating conditions as part of a grain cleaning machine the effect of air purification was 92.6-94.5% with a hydraulic resistance of 63 Pa, which corresponds to the claimed requirements.

Study of operation of four-screen shoes of grain-cleaning separators

“…The screenings from screens installed in the upper tier were supplied to the beginning of the subsequent screen. Passages according to the schemeon the screen of the lower tier [6][7][8].…”