THREE-STAGE DUST-COLLECTING SYSTEM Russian patent published in 2009 - IPC B01D45/12 B04C3/00 

FIELD: motors and pumps.

SUBSTANCE: three-stage dust-collecting system includes dust-laden gas source connected with the distribution header, three dust-collecting plants and fan. The dust-collecting plants are represented with dust-collecting units installed at counter-current swirling flows of gas. Each dust-collecting unit includes cylindrical body with the tapered hopper, the upper tangential inlet nozzle, the lower inlet nozzle with inlet swirler and dust extracting beveled washer. This washer is installed along body axis and at the outer surface of the lower inlet nozzle. The dust-collecting system also includes axial outlet nozzle for the cleaned gas and axial dust discharge nozzle. The latter is installed in the bottom part of the hopper and provided with flood-gate. There is a flood gate installed in the bottom part of the dust collecting unit. Outlet nozzles of the dust-collecting unit are provided with chokes and connected with the upper inlet nozzles of the second and third dust connecting units and with the lower inlet nozzles of the second and third dust connecting units. The lower inlet nozzle of the first dust-collecting unit is linked with its upper inlet nozzle. The axial outlet cleaned gas nozzle is coupled with the lower inlet nozzle of the second dust-collecting unit, whereas the axial outlet cleaned gas nozzle of the second dust-collecting unit is linked with the lower inlet nozzle of the third dust-collecting unit. Suction nozzle of the fan is connected to the axial outlet cleaned gas nozzle of the third dust-collecting unit. Preferably, ratio of the first, second and third dust-collecting units diameters should be 1:(1.2-1.5):(2-3), respectively.

EFFECT: increased effectiveness of dust-collecting process and possibility of system three-mode operation depending on highly-disperse dust particles amounts in initial gas and required degree of cleaning.

2 cl, 1 dwg, 1 ex