SU899088A1 - Scrubber - Google Patents

Description

The invention relates to devices for wet cleaning of dust from air or its mixture with other gases before being released into the atmosphere. A device for wet gas cleaning is known, which includes a housing filled with liquid in the lower part, with a gas inlet fitting equipped with a confuser, and a diffuser concentrically mounted, which forms a barling unit til with the confuser. The closest to the proposed technical essence and the achieved result is a device for wet gas cleaning from dust, including a housing partially filled with liquid, installed above the surface — a liquid, a vertical pipe for injecting dust-laden gas, the lower part of which is housed in a diffuser located in the top of the inside of the pipe is an annular liquid distributor with nozzles, a gas outlet pipe, a constant level sludge collector, made with the O1g pipeline — sludge water 2. However, the known devices they do not work efficiently when trapping fiber dust, since the diffuser slots covering the confuser will gradually become overgrown with fiber dust, thus reducing the quality of gas cleaning. In addition, these devices have a fairly high gi; favored resistance. gas purification efficiency by reducing the hydraulic resistance of the device. The goal is achieved by the fact that in a device for wet gas cleaning from dust, including a housing partly filled with liquid, a vertical pipe above the liquid surface for introducing a dusty gas, the lower part of which is located in the diffuser, an annular distributor of liquid with nozzles located in the upper part inside the pipe, a nozzle Gas outlet, a collection of sludge of a constant level, made 38 Btbifi with a sludge discharge pipeline, an outer annular chamber connected to the sludge discharge pipe, with the lower part of the pipe being perforated. On fng. 1 shows the proposed device, a general view; in fig. 2 — node 1 in FIG. one; in fig. 3 - node II on the fng, 1. A cocToiiT device from body 1, into which pipe 2 vertically enters from above to introduce dusty gas. In the upper part of the housing 1 there is a nozzle 3 for the discharge of the purified gas. In the lower part, to the casing, the collection 4 is attached. The lower end of the pipe 2 is provided with a diffuser 5. Inside the pipe 2 there is an annular distributor 6 of liquid with nozzles 7, and outside, around the circumference of the pipe 2, the outer annular chamber 8 is dispersed slightly below the annular distributor 6. The distributor G is a pipe bent into a ring from above eight to twelve nozzles 7 are placed. The annular chamber 8 is a rectangular tray covering the pipe 2 from the outside, with an overflow threshold 9 inside the tray separated from the outer surface of the pipe 2 by 3-S mm. On one axis with the pipe 2, covering it, the diffuser 10 is installed (counting in the direction of gas flow). The diffuser 10 is placed below the distributor 6 fluid and above the level o. - about. sludge in the collection of 4 sludge 150 150 mm. Between the diffusers 5 and 10 there is an annular gap, over the area of shchev-blotsi that is equal to the cross-sectional area of the pipe 2, the equality of these areas reduces fluctuations in the magnitude of the gas velocity and correspondingly reduces the hydraulic resistance of the device. The pipe 2 in the area from the upper base of the diffuser 1O to the upper base of the diffuser 5 is made perforated {aperture 11 0 5-1О mm; FIG. H) It is possible to make holes of square, rectangular and other shapes. A pipe 12 serves to supply water to the distributor 6. A pump 13 (type BM) and a pipe 14 serve to discharge the sludge, a pipe 15 to return a part of the sludge to the annular chamber .8. In order to maintain a constant level, the collector 4 has an overflow pipe 1. The device operates as follows. The gas to be cleaned of fibrous dust is fed to the device through a vertical pipe 2, mounted in housing 1. Moving through pipe 2 down, the gas encounters a liquid sprayed by the nozzles 7 of the ring distributor 6 (recycled water from the squeeze npecda aerofontane dryer, not shown) and partially dust free. The sludge formed after the interaction of the dusty gas with the liquid partly flows in the form of a film along the inner surface of the pipe 2, and partially falls down in the form of droplets. A gas with elusive particles of impurities is also moving down. Along the outer surface of the pipe 2: from the annular chamber 8 through the overflow threshold 9 also flows in the form of films of sludge supplied to the distributor by pump 13 through pipes 14 and 15. Due to the fact that the pipe 2 below the upper base of the diffuser Yu is perforated, a part (smaller) the gas through the holes 11 comes out, effectively interacting with the inner and outer flowing films of the sludge, and is cleaned of dust. This, on the one hand, reduces the total flow rate of the gas being cleaned, moving downward, which is important for creating a quiet, laminar flow in the lower zone of the apparatus, and, on the other hand, creates the effect of spraying the liquid in the form of droplets outside the pipe 2 inside the diffuser 10. Another (large) part of the gas is pr (it should move down through the pipe 2 and into the main working area, bounded by the slurry curtains flowing down from the 5 n 1O diffusers, the inner side side of the diffuser 1O, the large diffuser base 5 and Due to the large volume of the specified working area and at the same time reduction of the gas consumption passing through this zone due to the removal of a part of the gas through the openings 11 of the pipe 2, it has favorable conditions for quiet, laminar sedimentation of dust and droplets for a relatively long time, determined by the ratio of the volume of the working area to the gas flow through this zone. Since the perimeter of the lower (smaller) base of the diffuser 10 is significantly less than the perimeter of the lower (larger) base of the diffuser 5, the density irrigation bottom slurry curtain flowing from the lower edge of the diffuser 10, more

| The irrigation density of the upper slurry curtain flowing from the diffuser 5 of the pipe. Therefore, almost the entire mass of gas leaves the working slurry through the upper slurry curtain, clearing dust, and enters the zone located inside the diffuser 10 of the diffuser 10, where it is additionally cleaned dust, interacting with small droplets formed during the passage of gas jets through the holes 11 of the pipe 2 n through the sludge film flowing down its inner and outer surface. Next, the gas exits through the upper base of the diffuser 10 into the separation zone (the zone above the diffuser 1O), where the sludge droplets that fall into this zone are separated from the gas, and the purified gas shows the device through the nozzle 3.

The sludge from the collector 4 is pumped out of the mass pump 13, and a part of it is fed through the pipe 14 to the mass pool (not shown) of the aero fountain installation and drying, and the other part is fed via the pipe 15 to the annular chamber 8.

Thus, the removal of part of the gas to be purified through the openings 11 of pipe 2 reduces the amount of gas entering the main cleaning zone, bounded down by sludge curtains flowing down, part of the inner side surface of the diffuser Yu, the lower base of the diffuser 5 and the surface a - a sludge, and the presence on the pipe 2 diffuser S increases the volume of the specified zone.

The proposed implementation of the device creates conditions for the laminar movement of gas in the cleaning zone, increases the average residence time of the gas flow in this zone and contributes to an increase in the gas cleaning efficiency of fibrous dust with low inertia. In addition, an increase in the amount of sludge flowing down into a part of the sludge withdrawn from the device into the annular chamber increases the irrigation density in the sludge zone.

the curtain allows simultaneously operating with large gaps between the lower base of the diffuser 5 of the pipe and the inner surface of the diffuser 10, between the bottom (smaller) base of the last and the surface a - a of the sludge. This ultimately reduces the hydraulic resistance without reducing the gas cleaning efficiency.

Claims (2)

1.Avtskoe certificate of the USSR No. 585861. class. B 01 D 47 / O2, 1977. 2. US Patent No. 3626672, 55-185, published. 12.12.71 (prototype).