SU1680284A1 - Dust trap for wet cleaning of gases - Google Patents

Description

The invention relates to the wet cleaning of gases from dust and can be used to clean the cupola gases. The purpose of the invention is to increase the efficiency

gas purification by optimizing the distribution of the gas flow. To do this, in the dust collector, which includes a housing 1, made of confused 2 and diffuser 3 sections, water spray nozzles 10, a reflector 9 and a discharge device, diffuser sections 3 are made with an opening angle of not more than 50 °, and in the junction areas of the sections there are guide rails 11. In addition, the cross-sectional areas of each of the subsequent necks are reduced along the stream by 10-50% relative to the area of the previous necks 12. The indicated arrangement of the apparatus, while respecting the parameters, can significantly reduce passive vortex ones downstream flow, which increases the effective cross section of the effective interaction of the ηϋ-_ gas flow with the liquid. 2 ill., 1 tab.

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1680284 A1

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1680284

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The invention relates to the wet cleaning of gases from dust and cooling them before being released into the atmosphere and can be used, for example, to clean cupola gases by installing a dust collector on the cupola tube.

The purpose of the invention is to increase the cleaning efficiency by optimizing the distribution of the gas stream.

Figure 1 shows a dust collector, a longitudinal section; figure 2 - section aa in fig !.

The dust collector includes a housing 1, made of coaxial, docked confused 2 and diffuser 3 sections. The lower part of the housing 1 has a cylindrical shape and is made in the form of two cylinders 4 and 5 mounted on an inclined bottom 6, to which the tube 7 is connected. The cylinder 5 is provided with holes 8 for water flow. A cone-reflector 9 is mounted above the tube 7 1. Nozzles 10 for spraying water are installed in the diffuser, sections of the housing 1 of the dust precipitator and above the reflector 9. At the junction of sections 2 and 3 of the housing 1, the gratings 11 are installed, the diffusers of sections 3 have opening angles of not more than 50 °, and each subsequent neck 12 done with the mind nsheniem sectional area by 10-50% compared to the previous cross-sectional area of the neck.

The device works as follows.

The unpurified gas leaving the aggregates enters the housing 1 after partial cooling and cleaning with water flowing from the reflector 9. As a result of the sudden expansion of the gas flow in the first section 2 of the dust collector, the largest dust particles fall out and the installed screen in the form of a cylinder 5 prevents the housing from burning out . Installed in the junction of the grate 11 forms the structure of the gas flow during further movement into the zone of action of irrigation nozzles. In the case of the execution of the elements of the lattice 11 in the form of swirlers flow is attached to the twist, and the resulting centrifugal forces increase the efficiency of dust cleaning. Lattice 11 simultaneously prevent the removal of water droplets by the gas stream.

When the gas flow in the confused first section of the dust collector moves, cleaning takes place due to contact with drops of the irrigating liquid directly from the nozzles 10, as well as during secondary crushing of the jets on the guide grate 11. The grate 11 installed above the first tier of the nozzles 10 prevents the drops of the liquid gas flow from the dust collector section.

In the subsequent sections of the dust collector, the gas stream is cleaned in a similar way. Considering that in most cases the gravitational mechanism of precipitation is fully manifested in the first section of the dust collector, the areas of subsequent sections decrease, contributing to an overall increase in the gas flow rate.

Using the method of gas-hydraulic analogy on a transparent model of plexiglass, a dust collector is tested. The most favorable flow structure, in which passive vortex flows are eliminated or significantly reduced, is achieved by installing guide grids. The maximum opening angle of the diffuser and is 50 °. The intensity of the formation of vortices in the cross sections of the dust precipitation decreases with decreasing area of the output sections of the sections along the stream. The optimal conditions for this are achieved within the limits of variation of the cross-sectional area from 10 to 50%.

Intensity is defined as the formation of vortices i- ^'3' 100% where £ _in .z. - ploTdf.

Spare the vortex zone; £ differential - area of diffuser section expansion (FIG!).

Passive vortex flows generated at large opening angles of the diffuser increase the hydraulic resistance of the dust collector, which, as a rule, works on self-draining. This reduces the relative speed of pushing dust particles with drops of irrigating liquid. Vortex zones, where only residual movement of gas particles is observed, reduce the cross-sectional area of effective interaction of the flow with the irrigating fluid, practically limiting it to the transit part of the gas flow.

The test results are presented in the table.

Claims (1)

Claim Dust collector for wet gas cleaning, comprising a housing made of coaxially arranged docked confuser and diffuser sections, water spraying nozzles, a reflector, a discharge device, characterized in that, in order to increase the cleaning efficiency due to optimal distribution of the gas flow, it is equipped with guide grids installed in places five 1680284 6 docking sections, while section diffusers have opening angles of no more than 50 °, and each subsequent neck is made with a decrease in cross-sectional area by 1050% relative to the cross-sectional area of the previous neck. Opening angle Sieve guide Reducing the sectional area of sections downstream % tia diffu ka 0 ten 35 50 60 Eora The intensity of the formation of vortices,% thirty There is . 50 thirty thirty 20 40 Missing 70 60 40 50 50 50 There is 60 thirty thirty thirty 40 Missing 70 60 50 70 70 60 There is 70 '50 . 50 80 80 Missing 80 70 70 90 90 Aa 2