SU1458601A1 - Dust suppression method - Google Patents

Description

The invention relates to the mining industry. The purpose of the invention is to increase the effectiveness of dust suppression due to the acceleration of the process of heat and mass transfer under conditions of 1

The invention relates to the mining industry and can be used to combat dust in various technological processes at elevated temperatures in the presence of compressed air.

The purpose of the invention is to increase the efficiency of dust suppression due to the acceleration of heat exchange processes in conditions of elevated temperatures of dusty air and the use of cooled liquid for dust suppression.

The essence of the method lies in. next.

Under the action of an ejecting nozzle located along the axis of the body and jets of compressed air, suction of the surrounding dusty

the above t-r dusty air and the use of chilled liquid for dust suppression. A stream of dust-laden air is ejected by a torch of dispersed liquid emanating from a water-jet ejector nozzle. A stream of dusty air is spun with compressed air. The jet flow rate is periodically changed. Compressed air jet is supplied in a portion located between _ezhekti-: ruyuschey nozzle and place most of the plume expansion. The flow rate of jets change sinusoidally. This leads to a significant acceleration of condensation processes due to the intensification of heat exchange between the droplets and air. 1 hp f-ly.

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of air. The air under the action of jets of compressed air twists and swallows the dispersed liquid droplets. Under the action of inertial forces, rational redistribution of droplets and dust particles occurs along the cross section of the ejector,

8 C 1458601

The twisting is carried out

in the area located between the ejecting nozzle and the place of the greatest flare opening, which is determined by the formula:

where P is the diameter of the ejector, m;

B - the distance from the nozzle to the masses 1458601

that of the greatest disclosure of a torch, m;

ά- torch opening angle, degree

Spinning the flow in the area · | $ between the nozzle and the place of greatest disclosure, the torch leads to the following positive point. Since the swirling jets of compressed air in this area do not directly affect the torch, its deformation does not occur, and the swirling flow due to the reduction of the distance from the place of twisting to its contact with the torch has a greater effect] 5 on the torch and contributes to the twisting. drops. Thus, interaction of small dust particles with chalk-dispersed, and large ones with coarse-dispersed droplets is ensured. In addition, when a slurry-air mixture leaves the ejector, fine-dispersed sludge is protected by coarse-dispersed, which prevents it from being blown off by a ventilating stream.

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Under conditions of elevated ambient air temperatures with the use of chilled water, the speed of compressed air is changed sinusoidally, which leads to a significant 30 acceleration of condensation processes due to the intensification of heat exchange between the droplets and air.

As a result of all the processes occurring, an effective catch

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dust droplets.

Claims (2)

<claim-text> Formula of Invention </ claim-text> <ul style = "list-style: none;"> <li> <claim-text> 1. A dust suppression method that involves ejecting a stream of dusty air with a torch of dispersed liquid emanating from a water-air ejector nozzle, twisting a stream of dusty air, forming a slurry-air mixture and separating sludge </ claim-text> </ li> </ ul> <claim-text> and air, characterized in that, in order to improve the effectiveness of dust suppression by accelerating the process of heat and mass transfer under conditions of elevated temperatures of dusty air and the use of cooled liquids for dust suppression, swirling of a stream of dusty air is carried out by jets of compressed air, the flow rate which periodically change, and serves a jet of compressed air in the area located between the ejecting nozzle and the place of the greatest opening of the torch, which is determined from the expression </ cla im-text> <claim-text>. _ B / 2 </ claim-text> <claim-text> ^ 2 </ claim-text> <claim-text> where b is the distance from the nozzle to the place of greatest flare opening, m; </ claim-text> <claim-text> P - diameter of the ejector, m; </ claim-text> <claim-text> ~ flare angle, degrees. </ claim-text> <ul style = "list-style: none;"> <li> <claim-text> 2. The method according to claim 1, characterized in that the rate of flow of compressed air jets changes according to a sinusoidal law. </ Claim-text> </ li> </ ul>