SU1662637A1 - Scrubber - Google Patents

Abstract

The invention relates to a technique for wet cleaning of dusty process gases and aspiration air from supermicroscopic mid-dispersed dusts difficult-to-wet with water, can be used in the mining, metallurgical and other industries of the industry and allows increasing the degree of gas purification, reducing resistance and metal intensity. The scrubber contains a horizontal cylindrical body, a tangential gas inlet, made in the form of a Venturi tube. A nozzle, nozzles with continuous flow channels and a regulating gate are installed in its throat. The lower part of the cylindrical body passes into the sludge tank, made with a bias towards the gas outlet nozzle. The edge of the inlet port of the nozzle is located inside the body at a distance of 1/10 - 1/20 of its diameter from the generator of the body. An arcuate reflector arranged along the entire length of the body is located between the body and the slime-collecting bin, and forms with it two longitudinal gaps, one of which, located on the side of the inlet nozzle, is partially blocked by an arcuate protrusion. 3 il.

Description

The invention relates to a technique for the wet cleaning of dusty process gases and aspiration air from the submicrometer fractions of moderately dispersed dusts that are difficult to wet with water and can be used in the mining, metallurgical, energy, and other industries.

The purpose of the invention is to increase the degree of gas purification, decrease hydraulic resistance and metal consumption.

FIG. 1 shows the scrubber, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 - scrubber, side view.

The scrubber includes a housing 1, made in the form of a horizontal cylinder. From the top of the generator to the cylinder

body 1 tangentially at an angle (0-30 °) to the horizontal is attached a pipe 2 of the gas inlet entrance, made in the form of a Venturi tube and includes a confuser 3, a neck 4 with nozzle 5 located in it, nozzle 6 and a regulating gate 7.

Nozzles 6 are made with flow channels. Behind the nozzle b are located the diffuser 8 and the transition pipe 9.

The confuser 3 pipe 2 is connected to the gas duct 10 of dusty gas, pipe 9 - with the housing 1 The lower part of the cylindrical body 1 goes into a sludge tank 11, made with a slope towards the gas outlet pipe 12, the inlet opening of which is located inside

ABOUT

o y o co |

the housing and is from the forming body at a distance of 1 / 10-1 / 20 of its diameter.

A hydrolock is installed at the outlet of the sludge water 13. Between the housing 1 and the sludge collector 11 there is an arcuate reflector 14 made along the entire length of the coopus 1 and forming with it two longitudinal gaps 15 for the overflow of the sludge water, Gap 15 located on the side of the inlet 2 in order to improve the separation of moisture, it is partially blocked by the protrusion 16, which is a continuation of the generatrix of the housing 1.

Scrubber works as follows.

Dust gas, which is sucked off, for example, from an sintering machine (not shown), containing dust particles, the minimum size of which is 3-5 µm, is fed through duct 10 to nozzle 2 and compressed in confuser 3 with an increase in its speed from 14-18 to 28 36 m / s At this speed, the gas enters the throat 4, passes through the droplet curtain created by the low pressure nozzle 5, and, together with the drops of the spray liquid, is sent to the contact nozzle 6.

In nozzle 6, the dusty gas is distributed through the channels of the cells, and water droplets create a moving film of irrigating liquid on their walls. In the channels of the nozzle 6, dust particles under the influence of transverse pulsations of a turbulent gas flow are supplied to the walls of the channels and, overcoming the forces of surface tension of the liquid, are trapped by water. The gas that has been cleaned up in the nozzle 6 expands in the diffuser 8 and enters the scrubber body 1 at the initial speed of 14-18 m / s through the transition pipe 9 at an initial speed of 14-18 m / s.

. In the field of centrifugal forces arising from the swirling of the gas-liquid flow in the scrubber housing 1 with an axial velocity of 4-5 m / s, the waste sludge water separates from the flow, is pressed against the walls of the housing 1 and creates a uniform film of liquid on them, which through the gaps 15 between the housing 1 and the reflector 14 enters the sludge tank 11 and turns into a hydrolock 13. The cleaned gas is removed through the gas outlet port 12.

When cleaning gas from thinner fractions of medium-dispersed (supermicroscopic) dust with particles with a minimum size of 1-3 µm, part of the nozzle channels (up to 50%) is blocked by the gate valve 7. Thus, the working speed of the gas in the open cells increases 28- 36 to 40-60 m / s.

This is sufficient to create the necessary intensity of turbulent motion, or the gas flow in the nozzle 6 channels and efficiently precipitate even the smallest particles of moderately dispersed dusts, which include many dusts of mechanical origin.

The combination of an aerodynamically perfect (smooth) horizontal centrifugal droplet separator, in which there are no devices that increase its hydraulic resistance and create preconditions for the accumulation of dust deposits inside the apparatus, with a gas inlet nozzle, made according to the type of Venturi tube, in the mouth of which there are nozzles with channels cellular type, provides a simplified design, improving the efficiency and reliability of the gas cleaning process from medium dispersed in the burning dust at the lowest cost ah water and energy for this process.

5 The hydraulic resistance of the scrubber is small and amounts to 80-120 kgf / m2 when cleaning emissions from sinter production. This is 1.5–2 times lower as compared with the known device, the hydraulic resistance of which, when capturing the same dusts, varies between 120–360 kgf / m2.

Due to the developed surface of the contact planes of the honeycomb head and the reuse of waste liquid in the centrifugal appliance for flushing and transporting the collected dust, the irrigation water consumption of the proposed scrubber is 0.1-0.2 kg / m3

0 gas to be purified. Only when cleaning highly dusty gas streams with an initial dust content of 5-10 g / m3 or more, the water consumption rises to 0.3-0.4 g / m3 of gas. This eliminates the need to install

5 in front of the proposed scrubber of single, group or battery cyclones as pre-cleaning apparatus of highly dusty gas streams. Elimination of pre-treatment cyclone stage

High-dust gases reduce the energy consumption and metal consumption of the proposed scrubber by at least two times, respectively, the area of industrial premises occupied by the purification plant and the extent of dust-and-gas removal routes also decrease.

The tests of the proposed scrubber during the cleaning of emissions from sinter and refractory production of dust showed its reliability and high

efficiency, which depends on the initial dust content of the incoming gases and is 95-99%.

Claims (1)

Claims of invention The scrubber containing a horizontal cylindrical body, a tangential gas inlet nozzle with a gas speed regulating valve and a nozzle, a sludge duct located under the hull, an arcuate reflector placed between the hull and the sludge hopper, gas outlet no. In order to increase the degree of gas purification, decrease hydraulic resistance and metal consumption, the gas inlet nozzle is equipped with a nozzle and is made in the form of square or rectangular Venturi pipes, while the nozzles and nozzle are installed in the Venturi neck and the hopper is inclined towards the gas outlet nozzle, which is installed radially to the casing, and the edge of its inlet is located inside the casing at a distance of 1 / 10-1 / 20 of its diameter / / I. ff Qto & f B / 5 ii 3 S Schig.2  Shlamov T water Fig.Z