SU1265368A1 - Method of dust control - Google Patents

Abstract

The invention relates to the protection of atmospheric air and can be used in the mining industry to combat dust. The purpose of the invention is to increase the efficiency of the collection of fine dust. For this, pre-moistened granular solid particles, possessing kinetic energy, are applied to the dust zone simultaneously with the dispersed liquid with the Stokes criterion Stk 1. Dust is collected both by the dispersed liquid and by particles of solid matter. At the same time, the flow around is negligibly small. The capture section of the dust particles is close to the section of the granulated substance with the liquid film. se 4 tab. 07

Description

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The invention relates to the mining industry and can be used to combat dust.

The purpose of the invention is to increase the efficiency of fine dust collection.

Example. The way to combat dust is implemented in a shot-blasting chamber. The solid granulated substance is used in the process of the pellet.

Dispersed water and wet pellets are sent to the dust generation zone to trap the dust that forms it during the cleaning of the surface of the castings from the burned earth. For this, water in an amount of 6 liters per minute is supplied to the funnel of the shot-jet head. Together with the shot, the water enters the impeller, where it is intensively crushed. Next through the impeller junction box

In the place of the shot, water enters the wheel blades, which accelerates to a speed of 40-100 m / s and, under the action of centrifugal force, is ejected into the chamber in the direction of the surface of the castings to be cleaned. In this case, the dust is trapped both by the dispersed liquid and by the wet pellets themselves. Through the sludge disposal system, the sludge is removed to the sewer.

In tab. Figures 1 and 2 show the values of the Stokes coefficients calculated for granular particles in the possible range of their use, respectively, with r ~ 1 and 2 µm.

In tab. Table 3 lists the values of the Stokes coefficients for conditions of low-pressure irrigation with Gu 1-5-17.3-10f a in Table. 4 - the same with r „2 μm; p-1-10 kg / m, 3-10 Table

60

40

60

40

100

46

69

116

289

173 4060100 40 60 100 40 470705 1176 185 278462 92 510205 1020 5 2.9 5.8 11.5 1.4 2.95.8 0.9

40 60 100 40

60

100

100

23

35

58

17

29

eleven

table 2

Table 3 60 100 40 60 100 139 231 46 69116 10 20 51020 1.9 3.8 0.7 1.4 2.9 510 20 51020 5 11.6 23.1 46 5.8 11.6 23 3.8

From tab. 3 and 4, it can be seen that under conditions of low-pressure irrigation, the dust of fine fractions is not trapped due to a sufficiently high flow effect.

In contrast to the considered method of low-pressure irrigation, the method of high-pressure irrigation requires more sophisticated equipment and a greater flow of water, and a large consumption of water is not acceptable in a number of industries.

The use of pneumatic hydraulics requires an additional supply of compressed air, which also limits the scope of application of this method of control to dust, especially since both of them also do not allow to capture specks of 1-3 microns in size.

Thus, comparing the table. 1 and 2 and table. 3 and 4, it can be seen that the values of the Stokes criteria when using granular particles moistened with a liquid are compared to Table A

It is much higher with known conventional droplet capture, which allows dust with particle sizes of 1–3 µm to be captured, which cannot be achieved using known dedusting methods.

Claims (1)

Invention Formula A method of combating dust, which includes supplying dispersed liquid to a dust formation zone, characterized in that, in order to increase the efficiency of trapping fine dust, simultaneously with the dispersed liquid, granulated solid particles wetted with liquid, possessing kinetic energy with the Stokes criterion, are supplied to the dust formation zone. 10 20 510 20 7.7 15.4 2.9 5.7 11.6