SU1386309A1 - Straight-flow cyclone - Google Patents

Abstract

The invention relates to gas cleaning devices for removing solid impurities in different areas and improves dust collecting efficiency by reducing re-entrainment of dust and optimal placement of the intermediate dust collection zone. The inflowed inlet gas is rotated by a vane swirler. The dust particles under the action of centrifugal force are radially related to the cylindrical body and, having made spiral movements along the surface of the latter, are removed through the windows into the intermediate dust collecting chamber and the dust collecting chamber in the lower part of the body. The radial partitions in the dust collecting chambers serve to unwind the flow and do not interfere with the normal entry of dust. The purified gas is discharged through the axial nozzle. A stream displacer with a constriction allows to ensure a minimum distance in the radial direction to the walls of the cylindrical body, and in the dust extraction zone, to reduce the flow rates due to channel expansion, which leads to a significant decrease in secondary entrainment of dust. Relations are given to determine the distance and diameter of the constriction. 1 3.p. f-ly, 2 ill. Ш (Л со 00 О) со о со

Description

The invention relates to devices for cleaning gases from solid impurities and can be used in various industrial areas for cleaning process gases and extracting valuable products from them. . The purpose of the invention is to increase the efficiency of dust collection by reducing the secondary entrainment.

Figure 1 shows the proposed cyclone; figure 2 - section aa in figure 1.

The continuous cyclone contains a cylindrical case 1, a fairing displacer 2 mounted along its axis, an inclined swivel blades 3 mounted on the fairing, an output axial nozzle 4 forming an annular dust-collecting chamber 5 with the bottom of the housing 1 and an intermediate pick-up chamber 7 with a dust discharge pipe 8. The dust collector 7 is annular and communicates with the housing cavity on which it is installed, with a dust removal channel made in the wall of the housing in the form of windows 9 with bevelled ION stream edges. In the intermediate dust-collecting chamber 7 are installed radial partitions 10, located between the windows 9.

The dust channel (window 9) is located at a distance L from the output ends of the twisting blades 3, determined from the ratio

L (3.5 - 0.04 tA) D,

where L is the distance from the exit ends of the twisting blades 3 to the dust discharge. channel windows 9; oi - the angle of the blades 3 on

exit to the radial plane, equal to 30-45; D is the internal diameter of the cylindrical body 1; 0.04 - Dimensional Empirical Constant, i--.

The displacer fairing 2 is made with a constriction I1 located at the level of a dust extraction channel — windows 9, with the ratio of the minimum diameter d. narrowing 11 to the maximum diameter d? a? of the displacer is 0.24-0.32.

Yu

15 20. 25 30

35 40

45 50

55

The continuous cyclone operates as follows.

The dust-laden gas entering the continuous cyclone is driven into rotation by means of a twisting blade 3. The dust particles under the action of centrifugal force move radially to the wall of the housing 1 and, making a helical motion along the wall surface, are removed through the windows 9 into the intermediate collection chamber 7 and the extraction chamber 5. The radial partitions 10 and similar partitions 12 in the chamber 5 serve to unwind the incoming into the chambers 5 and 7 of the flow and do not interfere with the normal movement of dust to the dust extraction nozzles 6 and 8.

When moving along the wall of the housing 1, small dust particles with a stream of purified gas will depart. on the axis of the cyclone, therefore, the skirt-displacer 2 allows, on the one hand, to ensure a minimum distance in the radial direction to

walls, which contributes to an increase in dust collection efficiency, and on the other hand, the presence of restriction 11 contributes to a reduction in the gas velocity in the intermediate selection zone, thereby reducing the secondary entrainment of p-separated particles. It was established experimentally that the increase in efficiency occurs when the dust-collecting channel is located at a distance of L (3.5-0.04 oi) D and a sump duct 2 is produced with the ratio of the minimum diameter of the restriction 11 to the max displacing diameter of ок ox equal to 0.24 - 0 32. For a diameter of 120 mm and twisting blades mounted at an angle of the RO according to the invention, potassium chloride dust trapping with a median particle size of 10 µm with a change in dust content in the inlet range of 60-160 g / m is 94.02 - 94 , 99%, for the known cyclone - 87 - 90%.

Claims (2)

1. A continuous cyclone, containing a cylindrical body, mounted on its axis a fairing-displacer, fastened on the fairing twisting inclined blades, the output axial nozzle, forming from the bottom part of the body is an annular dust collecting chamber with a dust removal pipe, an intermediate dust collecting ring camera with a dust removal pipe installed on the housing and connected to its cavity by a dust removal channel, characterized in that, in order to increase the efficiency of dust collection by reducing the secondary collection. is located at a distance from the exit ends of the twisting blades, determined from the ratio L (3.5 - 0.04 ° (,) D, where L is the distance from the output ends of the twisting lp blades to the dust extraction channel; a is the angle of inclination of the blades at the exit to the radial plane, equal to 30-45; D is the inner diameter of the m-mnFmic body; 0,04 - empirical dimension constant, -----, and the fairing propellant is made with a constriction located at the level of the dust extraction channel, while the ratio of the minimum diameter of the constriction to the maximum diameter of the displacer is 0.24-0.32. 2. A continuous cyclone according to Claim 1, characterized in that the dust discharge channel is filled in the housing wall in the form of windows with edges beveled in the direction of rotation of the flow, and the intermediate dust collection chamber is provided with radial partitions located between the windows. 1 A-A Fmg.2