SU578989A1 - Gas-cleaning apparatus - Google Patents

Description

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The invention relates to a device for trapping dust and gas absorption by the wet method and can be applied in all areas of the industry for highly efficient gas cleaning, for example in the chemical and metapurgic areas.

A high-throughput Venturi scrubber with a multi-stage cleaning system is known, in which gas contaminated with highly dispersed dust moves through the neck from the top to the bottom and the sludge is fed to the entrance to the scrubber to increase the efficiency of the dust moistening process. Then, the moistened gas through the diffuser enters the settling tank located in the lower part, turns around 180 and moves upwards through the loose, soft, lightweight nozzle. The latter is located between the perforated plates placed one above the other at some distance, which are intended to increase the efficiency of removing particles and mist from gases.

In this case, the gas and the liquid droplets that are sprayed over this cleaning zone move countercurrently. Scrubber neck can

be flexible and its area can vary with a mechanical wire in accordance with changes in gas and liquid flow rates, providing a constant pressure drop.

In addition, a large number of inclined vanes lj can be mounted above the movable nozzle in order to increase the efficiency of the process of separating the purified gas from the liquid.

The known device can be used to clean only cold gases.

Closest to the proposed gas cleaning device, in the casing of which a coarse Venturi coaxially is installed, having a confuser, a throat, a diffuser, and between the walls of the Venturi tube and the casing there is a nozzle absorber, and a sludge separator 2 is located in the lower part of the casing ..

A disadvantage of the known device is that in the case of purification of hot gases, the latter are not pretreated and directly enter the Venturi tube, in which the evaporation of small particles of i-liquid occurs, which reduces dust coagulation and absorption. gas emissions and in accordance with this degree of gas purification. In order to increase the degree of gaea purification and reduce operating and capital expenditures, the proposed device is slept with a high-speed scrubber located inside the Venus pipe} three8 coaxially and the lower part of the scrubber is located in bushra, and the Venturi pipe is fitted with a cover ,. installed on the input edge of the confuser. The drawing shows the proposed device, a longitudinal section. The device includes a hopper 1 -. schlamae precipitator in which the lower part of the high-speed scrubber 2 is located with nozzles 3 for supplying liquid. The lower end of the high-speed scrubber is located below the liquid level in the hopper. A venturi 4 is installed outside the high-speed scrubber 2. The lower section of the venturi does not reach the level of the liquid in the bunker. Outside the Venturi tube 4 is a coaxial but the device case 5 is placed, the lower section of which is located below the liquid level in the bunker. In the gap between the Venturi tube and the building, the som is stretched with a horizontal stack 6, on which plastic hollow balls 5 7 or polyethylene rings are located, Mekadu nozzles for liquid supply are located at the ball 7, In the upper part of the casing -5 there is a pipe 9 for releasing clean gas. This nozzle is connected to a fan installation 10, which creates t GHUs for the passage of gas through the entire installation. A cover 12 is installed at the entrance edge of the confuser 11. Between the cover 12 and the top cut of the high-speed scrubber 2 there is a gap for the passage of cleaned gases. A sprinkler 13 is placed in the gap between the high-speed scrubber and the Venguri pipe. There is a branch pipe 14 for supplying contaminated gases to the high-speed scrubber. There is a hatch 15 at the bottom of the bunker for discharging sludge. The proposed device works as follows. Dangerous gas enters the percussion tube, and, rising up at a speed of m / s, sprays and maintains in a suspended state a mass of irrigating liquid, which is supplied by nozzles 3. At such gas rates and high densities, the irrigation gas cools very quickly and it is saturated with moisture to the dew point, and dust and tar are 60–80% washed from the gas and settled in the bunker, and 80–99% of the gaseous constituents (depending on the irrigated absorbent and the composition of the gas to be absorbed). In addition, 1 O-20% of the irrigating liquid is discharged from the high-speed scrubber in the form of splashes, which reduces the overgrowth of the Venturi tube. The gas prepared in the high-speed scrubber enters the Venturi tube, where it accelerates to a throat speed of 60-120 m / s IB (depending on the properties of the captured dust). Through the irrigator 13, the irrigating liquid is poured up to 2.5 liters per meter cubic gas, creating a film on the walls. In front of the throat of the venturi, a film of liquid is torn from the walls and sprayed with gas. When the gas velocity is high, the dust particles contained in it collide with the drops of the irrigating liquid and are caught by the latter. When the gas is rotated by 18O after the venturi pipe exits, large drops of water with dust by inertia are caught by the surface of the liquid in the bunker and are deposited in it. The gas with small drops of moisture and dust through the net 6 with a living cross section of 80% enters the packed absorber at a speed of 8-12 m / s and brings the irrigated hollow polyethylene spheres or plastic rings into a fluidized turbulent state. The space between the balls is filled with foam. Surface. foams and balls (a layer of balls in the static position of 300-800 mm) are highly developed, which contributes to the effective trapping of dust particles and gaseous components contained in the gas. From the first layer of the mobile nozzle, the gas passes to the second through the grate with a live section of 40% at a speed of 3-5.5 m / s. The third layer of the sharksja nozzle is a slow moving gas velocity of 1.8-3 m / s), which serves as a drip catcher. Irrigation of the second layer of the nozzle is made with fresh liquid in an amount that compensates for evaporation and removal of liquid with sludge from the hopper. Irrigation is done by coarse spray nozzles 8. The proposed device provides highly efficient cleaning of any gases in one unit, saving production space, reducing energy consumption, since there are no connecting ducts, saving materials for manufacturing devices, reducing: leaks in atmospheric air and overgrowth walls.

Formula

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A gas cleaning device with a venturi tube coaxially installed in it, which has a confuser, a diffuor throat, and a packed absorber is located between the walls of the Venturn tube and the shell, and a sludge bunker with a different hem is located in the lower part of the shell, which is - gas and lower operating and capital costs;

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The CKOpocTHbiM DM scrubber placed inside the Venturi tube is coaxial to the last, the npH4eivj lower part of the scrubber is located in the bunker; and the Venturi tube is fitted with a lid mounted on the inlet edge of the confuser.

Sources of information taken into account in the examination.

1. US patent number 3793809, CP. 55-91, 1974.

2.Patent of France No. 203О455, cl. B01 D 47/00, 1970.

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