SU816515A1 - Apparatus for wet gas cleaning - Google Patents

Description

The invention relates to the wet cleaning of exhaust ventilating and industrial gases and can be used in any sector of the national economy, which requires the cleaning of gases from solid, liquid and gaseous harmful and explosive substances.

A device for wet gas purification with internal circulation of liquid, comprising a housing partially filled with liquid, inside which a Venturi pipe with an irrigation system, a drip tray and is installed.

A disadvantage of the known device is the significant consumption of irrigation fluid and the difficulty of removing sludge.

Closest to the proposed invention in technical essence and the achieved result is a device for wet gas purification with closed fluid circulation, including a housing, inside which there is a Venturi pipe with a liquid supply pipe to the neck, a droplet eliminator. The liquid in the neck of the venturi is supplied with compressed air [2].

A disadvantage of the known device is the ineffective dispersion of fluid in the venturi and the need to use compressed air to irrigate the venturi. ’

The purpose of the invention is to increase the efficiency of gas purification.

_ The goal is achieved in that the throat and diffuser of the venturi are bent to the upper wall of the housing, while the angle between the axis of the throat and diffuser and the horizontal axis of the confuser is 8-16, 15 the fluid supply pipe is equipped with a nozzle with a slot-shaped outlet installed along the axis of the throat, located above the liquid level.

In this case, the droplet eliminator is made in the form of rectangular plates installed with a gap, located tangentially to the cylindrical surface, and in the form of 25 vertical plates, the first and last of which are attached to the upper wall of the casing and have triangular cutouts in the lower part, and the middle is made in the form of a triangle , the apex of which is located at a distance from the upper wall of the housing, while the plates are made with trays located on the sides of the triangles.

. In FIG. longitudinal cut A-A to cut B-B to cut B-B at

4.

. part 2 of which, acting as a sludge collector, has a conical bottom equipped with a branch pipe with a shutter 3. In the housing 1 there is a curved Venturi pipe consisting of an inlet pipe 4, a confuser 5, to which a neck 6 s adjoins with a rise at an angle of 8-16 ° output diffuser 7. At the beginning of the neck 6, a plane-blade non-pressure nozzle 8 with a slotted outlet is installed along its axis. The bend of the venturi with the rise of the neck 6 with the diffuser 7 is made so that the slotted hole of the nozzle 8 is located under the very liquid level. The nozzle 8 is connected to the pipe 9 for supplying irrigation fluid, to which in its lower part is adjacent a poppet valve 10 with a rod 11, which serves to control the amount of absorbed irrigation fluid. Behind the outlet diffuser 7, the first stage of the droplet eliminator is installed, which is a rectangular plate 12 mounted with a gap tangential to the semi-cylindrical surface.

The second stage of the droplet eliminator is made in the form of vertical plates 13, 14 and 15, the first and third of which are attached to the upper wall. case and have in the lower part triangular cut-outs for gas passage 40 .. The middle plate 14 is made in the form of a triangle, the apex of which is located at a distance from the upper wall of the case.

The plates are made with grooves 16. A hole for the passage of gas at the middle plate 14 is located 'above the trays 16 ,. and the plates 13 and .15 are under the trays 16. The exhaust pipe 17 serves to clean the cleaned gas. The dust collector is equipped with an overflow device 1-8 with a water lock to maintain the liquid level in the housing 1. The fluid in the housing is supplied through a ball valve.

The device operates as follows. .

The gas to be cleaned is supplied through the inlet pipe 4 to the venturi. Irrigation fluid due to the discharge of the gas stream in the neck 6 is sucked through a poppet valve 10, pipe 9, a flat slotted nozzle 8 and enters along the axis of the neck 6 of the Venturi pipe into the zone, the device is shown in section at the highest gas flow rates1;

FIG. 1; FIG. 1; FIG. 1.

The device has a housing in FIG. FIG. FIG.

- once

- once

- once

1,. lower to a

where particles of dust, colliding with a dispersed liquid, are captured by it and enter the outlet diffuser 7. In the diffuser 7, the particles are coarsened to droplets capable of settling on the surfaces of the 12-1S plates. At the outlet of the diffuser 7, droplets of sludge due to the action of centrifugal forces first fall on the plate 12 located relative to the semi-cylindrical surface. Through the gaps between the plates 12, droplets of sludge flow down the surface of the plates 12, facing the end wall of the housing and not located in the gas flow zone, into the lower part 2 of the housing 1. Then, additional separation of the droplets is carried out, on the vertical plates 13, 14 and 15, located across the flow and along the trays, the helmet also flows to the walls of the body and enters its lower conical part 2. B. The conical part of the body slurry settles and is periodically discharged through the gate '3 into the receiving tank. Compensation of fluid loss with sludge due to evaporation · is carried out from the water supply system through a ball valve. The purified gas is released into the atmosphere through the outlet pipe 17.

The proposed device with irrigation of gas through a slotted nozzle located along the axis of the neck of the venturi and above the liquid level provides the greatest use of the magnitude of the discharge of the gas stream. for suction of the liquid and its even distribution by a flat water torch over the cross section of the gas stream entering the purification, which determines the high efficiency of dispersing the liquid and the gas purification process.

the presence in the proposed apparatus of the valve device for controlling the amount of incoming irrigation · liquid provides optimal process conditions for each of the specified conditions.

The droplet eliminator of the proposed design, in which there is no oncoming ί movement of liquid and gas, eliminates the removal of droplet moisture from the apparatus.

The proposed device with an adjustable amount of irrigation fluid coming in through self-priming, due to the introduction of it along the axis of the venturi in the largest zone. the gas flow rate, provides a highly effective contact of the gas with the liquid, which allows to expand the scope of the apparatus for trapping aerosols of acids, absorption of gases and for other purposes.

Claims (2)

(54) DEVICE FOR WET GAS CLEANING of the upper wall of the housing, while the plates are filled with trays located on the sides of the triangles. .In FIG. 1 shows a device, a longitudinal section f in FIG. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 1 in FIG. 4 shows a section B-B in FIG. one. . The device has a housing 1 ,. bottom Part 2 of which, acting as a sludge collector, has a tapered bottom equipped with a branch pipe with a gate 3. In case 1, there is a curved Venturi pipe consisting of an inlet pipe 4, confuser 5, which has a neck with a lift at an angle of 8-16 output diffuser 7. A flat-blade non-pressure nozzle 8 with a slotted outlet is installed along its axis in the opening of the neck b. The bend of the venturi tube with the lift of the throat cavity with the diffuser 7 is made so that the slit opening of the nozzle 8 is below the liquid level itself. The nozzle 8 is connected to the irrigating fluid supply pipe 9, to which the disk valve 10 with the rod 11 is connected in its lower part, which serves to regulate the amount of irrigating fluid supplied. Downstream of the outlet diffuser 7 there is installed a first stage of the trap layer, which is rectangular plates 12 mounted with a gap tangentially to the semi-cylindrical surface. The second degree of drop catcher you. Filled in the form of vertical plates 13 14 and 15, the first and third of which are attached to the upper wall. the body and have in the lower part of the triangular cut-holes for the passage of gas .. From the front of the plate 14 is made in the form of a triangle, the top of which is located at a distance from the top of the wall of the body. In this case, the plates are made with the same foreheads 16. The opening for the passage of ha beyond the middle plate 14 is above the trays 16 ,. plates 13 and .15 are under trays 16. For discharge of purified gas, there is an outlet 17. The dust collector is equipped with an overflow device 1-8 with a hydraulic lock to maintain fluid level in the housing. The fluid in the housing is supplied through a ball valve. The device works in the following way. L, The gas to be cleaned is supplied lio to the inlet 4 in the venturi. The irrigating liquid due to the discharge of the gas flow in the neck b is sucked through the disc valve 10, the pipeline 9 / flat slit nozzle 8 and flows along the axis of the neck b of the Venturi tube into the zones of the largest gas flow velocities, where the dust particles collide with dispersed liquid, they enter it enters the output diffuser 7. In the diffuser 7, the particles are sealed to drops capable of settling on the surfaces of the plates 1215. At the outlet of the diffuser 7, the lama droplets due to the action of centrifugal forces first fall on the plates 12, which are located relative to the semi-cylindrical surface. Through the gaps between the plates 12 drops of sludge flow down the surface of the plates. 12, facing the end wall of the casing and not in the zone of action of the gas flow, into the lower part 2 of the casing 1. Then the additional separation of drops is carried out on the vertical plates 13, 14 and 15 located across the flow and along the trays, the helmet flows down also to the walls of the body and into its lower conical part 2. B. the conical part of the body the sludge settles and periodically discharges through gate 3 into the receiving tank. The loss of liquid with tssham due to evaporation is carried out from the water pipeline through. . ball valve. The purified gas is emitted into the atmosphere through the outlet nozzle 17. The proposed device with gas irrigation through a slit nozzle located along the throat axis of the Venturi tube and above the liquid level ensures the greatest use of the magnitude of discharge of the gas stream. for suction of liquid and its uniform distribution. a flat water torch across the cross section of the gas stream entering the purification, which determines the high dispersion efficiency of the liquid and the gas purification process. The valve apparatus in the proposed apparatus for controlling the amount of liquid injected ensures the optimal process conditions for each of the specified conditions. The drift catcher of the proposed design, in which there is no oncoming movement of liquid and gas, eliminates the removal of droplet moisture from the apparatus. . The proposed device with an adjustable amount of irrigating fluid, delivered by self-priming, thanks to introducing it along the axis of the Venturi tube into the zone of greatest gas flow rates, provides a highly efficient gas contact with the liquid, which expands the range of application of the apparatus for trapping acid aerosols, absorption gases and for other purposes. Claim 1. A device for wet cleaning of a gas with closed circulation of liquid, comprising a housing partially filled with a liquid, inside of which there is a venturi tube with a liquid supply pipe into the mouth, a drop, a trap, characterized in that the throat and diffuser of the Venturi tube are bent to the upper wall of the body, the angle between the axis of the throat and the diffuser and the horizontal axis of the confuser is 8-16 °, the fluid supply pipeline is provided with B throat nozzle with slit-like outlet opening arranged ngsch liquid level. 2. The device according to claim 1,; of t and h and ya e with the fact that the drip catcher is made in the form of ff g (to I / JSfS fSlf 0 fs 7 we with a gap of rectangular plates located tangentially to the cylindrical surface, and in the form of vertical, ticking plates, the first and last of which are attached to the upper wall of the body and have triangular cuts in the lower part, and the middle is made in the form of a triangle the top of which is located at a distance from the upper wall of the housing, while the plates are made with trays located on the sides of the triangles. . Sources of information taken into account in the examination 1 USSR author's certificate 5 233635, CL. B 01 O 47/10, 1965. 2. USSR author's certificate No. 544452, cl. B 01 D 47/10, 1973. / I P (put. g Vat.Z flptf.