SU768474A1 - Vortex-type dust trap - Google Patents

Description

one

The present invention relates to the field of gas cleaning from dust and can be used in the chemical, atomic, food and other industries of the industry .5

A vortex dust collector, operating on the principle of dry gas cleaning with a counter-flow of a secondary trap gas, is known, which comprises a cylindrical body, the lower part of which is a dust collecting bin, a gas line installed inside the body, with a swirler and fairing at the outlet, a diaphragm and a number of tangentially oriented nozzles located at the top of the housing 1.15

The disadvantage of such a dust collector is that part of the dust collected, and delivered to the bunker, especially the fine fraction, is carried away by the outgoing gas stream, as a result of which the degree of trapping is reduced.

Also known is a vortex dust collector containing a cylindrical body, in the upper part of which a diaphragm and a series of 25 tangentially directed nozzles are installed, and in the lower part there is a bunker, a central pipeline with a swirl and a fairing with a coaxially located inside it connecting the bunker with a vacuum section of the swirl. Dust collector ra- 30

boils on the principle of two opposite swirling flows 2.

The disadvantage of the dust collector is that a part of the collected dust, mainly fine fraction, together with the ascending gas flow from the bunker through the tube enters the axial swirl zone, blows a drop-shaped fairing, at the end of which the stream of dust-laden gas narrows and goes upwards outside the separation zone. As a result, fine dust overshoot occurs in the device and its degree of trapping for particles less than 5 microns does not exceed 90% in this case.

The purpose of the invention is to increase the degree of dust collection.

The goal is achieved by the fact that the dust collector is equipped with an additional swirler installed in the output end of the coaxial tube.

In addition, the output end of the coaxial tube is made in the form of a reverse cone and, therefore, plays the role of a fairing.

The drawing shows a longitudinal section of a vortex dust collector.

The vortex dust collector contains a cylindrical body 1, a diaphragm 2, nozzles 3 of the secondary trap gas located tangentially to the generator of the body 1 at an angle of 30-40 ° to its axis, the axial pipe 4 with a swirler 5 and coaxially installed in it 6, the output end of which made in the form of a return cone-flap 7, in which an additional supercharger 8 is placed, the inlet end of the tube 6 is installed in the bunker 9 and is equipped with a regulator 10 of the gas flow sucked from the bunker.

In addition, the device contains a retaining washer 11 located between the housing 1 and the axial pipe 4, and the additional swirl 8 is provided with a fairing 12.

Vortex dust collector works as follows.

Dust-laden gas is introduced into the device through the inlet axial conduit 4, twisted by a blade swirl 5, and then pushed the cone-fairing 7 towards the walls of the housing 1, while maintaining rotational motion. A vortex of dust-laden gas near the walls of the housing 1 rises upwards. A secondary gas trap is fed to the nozzles 3 located in the upper part of the housing 1. The trap gas flow spins the dusty gas flow in the same direction as the swirler 5. Under the action of centrifugal forces, dust particles from the internal primary vortex move to the interface between the flows of the primary dust gas and the secondary trap gas. Here, the radial component velocity of the particles drops to zero and they at the boundary of the two vortex flows move in the direction of the axial component of the gas-trap, i.e., into the bunker 9.

The secondary trapping gas during the spiral flow of the vortex flow of the gas being purified gradually penetrates into it and they both leave the device through the diaphragm 2. Part of the secondary trap gas enters the hopper 9, and then through the tube 6 and the regulator 10 of the exhausted gas flow enters the additional swirl 8, which twists the flow of sucked dusty gas from the bunker 9 into the same

side as the main swirler and provides the flow of dust in the main primary gas flow. The cone-fairing 7 serves to push the main stream of dusty gas to the walls of the housing 1. The gas velocity at the exit of the additional swirl 8 can be changed both by the regulator 10 and by changing the sizes of the fairing 12. Retaining plate 11

reduces the entrainment of trapped dust from the hopper by creating a pressure differential between the working area of the device and the bunker 9. The proposed vortex design

without a significant increase in its hydraulic resistance, the dust collector can increase the degree of collection of fine dust (less than 5 microns) up to 95%.

Claims (2)

1.Vortex dust collector comprising a cylindrical body installed in its upper part, a diaphragm and tangential nozzles for introducing secondary gas, a hopper placed in the lower part of the body and an axial duct with a swirler to enter the gas to be cleaned and a coaxial tube connecting the bunker to the vacuum section of the swirl , characterized in that, in order to increase the degree of dust collection by eliminating the leakage of gas from the bunker into the axial zone of the dust collector, it is equipped with an additional swirler installed in the outlet box nce coaxial tube. 2. A dust collector according to claim 1, characterized in that the output end of the coaxial tube is made in the shape of a reverse cone. Sources of information taken into account in the examination 1. US Patent N 3744220, cl. In 04C 3/06, 1973. 2. USSR author's certificate N ° 436677, cl. In 04C 3/06, 1969 (prototype).