UA25753U - Dust catcher with aftertreatment - Google Patents

Abstract

A dust catcher with aftertreatment contains housing, tangential inlet duct, axial inlet and dust outlet branch pipes and louvre separator. Furthermore, it contains an additional dust catcher for removal of dust from the gas located outside beyond the limits of the housing of the device at the level of conical part of its housing in parallel to its walls, the branch pipe for removal of purified gas of which is located in its upper part, it is directed perpendicularly upward in parallel to the walls of the housing of device and enters by its upper end into the branch pipe of introduction of powder-gas mixture into the device.

Description

Description of the invention

The useful model is intended for cleaning the air from dust and can be used in all, without exception, 2 branches of the economy.

The closest to the proposed dust collector in terms of design is the device (A.s. of the USSR Mo1606157

Vosha 5/12, blvd. Mo42 dated November 15, 1990) is a prototype that includes a body, tangential inlet nozzle, axial outlet and dust outlet nozzles and a shutter separator.

The dust-air mixture, entering tangentially into the body of the apparatus, makes a helical movement along the 70 spiral guide around the outlet nozzle, where, under the action of centrifugal forces, primary cleaning of the mixture takes place in a known manner. Then, the already separated layer-by-layer flow, which moves around the shutters of the separator, passes through the gaps between the shutters, making a sharp turn of a small radius at an angle greater than 90, but less than 180 degrees. At the same time, due to their inertia, dust particles do not keep up with the flow and collide with the shutters of the separator. Thus, having made several collisions with the shutter of the separator, the dust particles 72 fall either into the contaminated flow moving along the wall of the case along the spiral guide, or into the air flow that rotates around the next shutter, where the cleaning process is similar. Passing in this way along all the blinds, dust particles are removed through the dust outlet. Purified air, which passes through the louvered separator, is removed from the device through the purified air outlet.

The known device cannot provide a significant increase in the efficiency of dust collection due to the impossibility of ensuring the action of a constant outward force on the particle and the connection to the process of dust separation of the increased forces of weight and inertia, as well as the fact that all the finely dispersed dust that passed through the gaps between the shutters of the separator is not captured in the device and thus itself reduces the efficiency of air purification from dust by its value. 29 The basis of a useful model is the task of creating a dust collector, in which the air purification system from finely dispersed dust in the additional dust collector allows the smallest fractions to be separated from the already purified dust and gas flow, from where the purified gas is again fed through the pipeline system into the upper part of the apparatus into the dust and gas inlet pipe flow, which must be cleaned of dust, and this allows you to increase the efficiency of the device. o 30 The task is solved by the fact that in a dust collector with additional post-cleaning, which contains a housing, a tangential inlet nozzle, axial outlet and dust outlet nozzles and a shutter separator, which differs in that according to the invention it has an additional dust collector for cleaning gas from dust, placed - from the outside, outside the body of the device at the level of the conical part of its body, parallel to its walls, a nozzle (from the outlet of purified gas, which is located in its upper part, is directed perpendicularly upwards 3o parallel to the walls of the device body and enters with its upper end into the nozzle for the introduction of the dust-gas mixture into the device; louvered the separator in its lower part, opposite the dust outlet nozzle, has a conical bottom for collecting gas with finely dispersed dust, in the lower part of which there is a pipeline along the vertical axis of the shutter separator, which, at the point of transition of the cylindrical part of the device body into the conical one, turns at an angle of 90 degrees to the vertical axis of the device in the direction of the additional dust collector and outside the housing Z 70 of the device enters tangentially into the housing of the additional dust collector in the upper part of its vertical wall. c In Fig. shown is the dust collector with additional after-cleaning (front view).

"Iz" Dust collector with additional after-cleaning consists of a body 1, a nozzle 2 for entering the dust-gas mixture into the device, nozzles for the output of purified gas Z and purified dust 4, a louvered separator 5 with a louver 6, a conical bottom of the louvered separator 7, a nozzle 8 for the output of the separated shutter separator 45 of fine dust into the additional dust collector 9 and the vertical nozzle 10 of the outlet of the purified gas in the additional dust collector. sl The dust collector with additional post-cleaning works as follows: the dust and gas mixture enters the device body 1 tangentially through the inlet pipe 2. Under the action of centrifugal forces, coarse dust particles are pressed against the outer wall of the device body 1, and fine dust is captured by the gas flow and sl 20 moves in side of the louvered separator 5. Near the separator, dust particles come into contact with the louver 6 of the louvered separator 5 and bounce off them towards the flow of coarse particles that move c" along the wall of the body 2 of the device, are captured by it and fall into the dust discharge nozzle 4. Therefore, the dust and gas flow, having entered into the device tangentially through the nozzle 2, comes under the influence of centrifugal forces, which throw larger dust particles from it to the outer wall of the housing 1, where a flow of coarse dust is formed in the direction from the inlet 2 to the dust outlet 4 nozzles. We know that in order to remove solid particles of dust from the c stream, half of its revolution along the shutter separator 5 is enough, therefore, after the flow makes half a revolution, the forces of gravity and inertia begin to act on it additionally, which push this flow first along the outer wall of the apparatus housing 1, and then in the direction of the dust outlet nozzle 4. Practically all the separated coarse dust enters the dust outlet nozzle 4. Part of the fine dust 60, which cannot be separated by centrifugal forces, is captured by the gas flow, which simultaneously moves to the shutter separator 5 and, making a turn on angle a (90 ос«а«1802) in the direction of the opening between its shutters b, passes through these openings into the shutter separator 5, from where the purified gas is discharged from the device through the nozzle 3. The rest of the finely dispersed dust particles cannot keep up with the flow due to the forces of inertia, fall behind him and cannot turn into the hole between the blinds b, collide with the blinds, because are deflected from them in the direction of movement of fine dust, are reflected by the flow back, again -

are captured by the gas flow, - they collide with the shutters and are reflected by them, and so on until they fall into the flow that moves towards the dust discharge nozzle 4. That small part of this finely dispersed dust, which will be carried along with the gas flow through the gaps between the shutters b, together with the gas flow, it continues the vortex movement inside the shutter separator, and due to the forces of gravity, it descends down to the conical bottom 7, to collect gas with finely dispersed dust, the shutter separator 5, located in its lower part opposite the dust outlet nozzle 4. From the conical bottom of the shutter separator 7 through the pipeline 8, the dust-gas mixture will be delivered to the additional dust collector 9, placed externally outside the body of the device 1, at the level of the conical part of its body parallel to its walls, where the separation of 7/0 fine dust from the gas flow that transports it occurs. The pipeline 8 is located in the lower part of the conical bottom of the louvered separator 7 along its vertical axis and at the point of transition of the cylindrical part of the device body into the conical part, it turns at an angle of 90 degrees to the vertical axis of the device in the direction of the additional dust collector 9, and outside the body of the device, it enters the body tangentially additional dust collector in the upper part of its vertical wall. The dust separated in this way is collected in the hopper /5 of the additional dust collector 9 (according to the arrow - "dust"), and the gas purified in the additional dust collector 9 is supplied through the nozzle 10 of the outlet of the purified gas of this dust collector, which is located in its upper part and is directed perpendicularly upwards in parallel to the walls of the apparatus body to the nozzle 2 of the dust-gas mixture input into the apparatus. In this way, a system of continuous air purification from dust is carried out. The system of additional gas purification does not require the forced supply of gas from the apparatus of additional purification 9 to the inlet of the apparatus 2 due to the presence of a pressure difference between the entrance to the apparatus and the system of additional purification.

Experimental studies of the dust collector with additional after-cleaning were carried out in order to determine the place of turning of the pipeline 8 relative to the height of the conical part of the housing 1 of the dust collector at 90 degrees to the vertical axis of the device in the direction of the additional dust collector 9 at the standard experimental stand of the National University "Lviv Polytechnic" on the proposed device ov with air consumption - 3000 m3/hour, on standard dust (quartz sand). Test data are shown in Table 1. With no

The place of turning of the pipeline relative to the height o av zv v lm v | zv (chi | zv (li plo, schi in Tue Ovta|vvya vbrid TV and Tue Tvo vlyu in tet eto 96e 96e 962 964959 943 858 762 sch

As can be seen from Table 1, when turning the nozzle 8 of the dust-gas mixture outlet at the transition point from the cylindrical part of the apparatus body to the conical part at an angle of 90 degrees to the vertical axis of the apparatus in the direction of the additional dust collector 9, the maximum efficiency of the apparatus is achieved, which is explained by the optimal conditions of movement of the dust-gas mixture flow in the conical part of the apparatus body. When the turning point of this pipeline 8 is lowered down towards the dust discharge nozzle 4, the flow of fine dust moving along the wall 1 of the dust collector housing is even more turbulent, because it needs to go around the pipeline 8, and this leads to a decrease in efficiency operation of the device. In addition, the presence of the pipeline 8 in the conical part of the device turbulates both the primary and secondary flows of the gas-dust mixture, which negatively affects the efficiency of the proposed dust collector. Raising the turning point 15 of the pipeline 8 into the cylindrical part of the housing leads to the same negative consequences, therefore we decided to turn the nozzle 8 of the dust-gas mixture outlet at the point of transition of the cylindrical part of the housing (9) of the device into the conical one. -1 We conducted comparative studies of the proposed dust collector with additional after-cleaning with the prototype at the experimental stand of the Lviv Polytechnic University", the results of which are shown in Table 2. In 1 50 dust quality, quartz sand was accepted. s and 180 60

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As can be seen from Table 2, the advantages of the proposed design are obvious, which is explained by the installation in the proposed design of an additional system for cleaning the fine fraction of dust in an additional dust collector carried outside the device and returning the cleaned.

That is, the gas that transported finely dispersed fractions of dust, after its cleaning in the additional cleaning system, goes back to the beginning of the device in its inlet pipe for additional cleaning.

Claims (2)

The formula of the invention , , DOSH , and , 1. A dust collector with additional after-cleaning, containing a body, a tangential inlet nozzle, an axial outlet and dust outlet nozzles and a shutter separator, which is distinguished by the fact that it has an additional dust collector for cleaning the gas from dust, placed externally outside the body of the apparatus at the level of the conical part of its housing parallel to its walls, the outlet of the purified gas is located in its upper part, is directed perpendicularly upwards, parallel to the walls of the apparatus body and enters with its upper end into the inlet of the dust-gas mixture into the apparatus. 2. A dust collector with additional after-cleaning according to claim 1, which differs in that the shutter separator in its lower part opposite the dust outlet nozzle has a conical bottom for collecting gas with finely dispersed dust, in the lower part of which there is a pipeline along the vertical axis of the shutter separator, which is in place of the transition of the cylindrical part of the device body to the conical one turns at an angle of 90 degrees to the vertical axis of the device in the direction of the additional dust collector and outside the device body enters tangentially into the body of the additional dust collector in the upper part of its vertical wall. that 2 (ze) IF) in IF) p - and? ime) 1 - and 1 syu» 60 b5