RU108320U1 - SCUBBER - Google Patents

Abstract

 A scrubber comprising a vertical cylindrical body provided with inlet and outlet pipes in the upper part, a Venturi pipe located vertically inside the body, connected to the inlet pipe and provided with a spray, a rotary chamber with a drain pipe, partially filled with liquid and located in the lower part of the body, a droplet eliminator, characterized in that at least one swirler, at least one chipper and at least one nozzle are arranged in series in the central part of the housing, and the pre-collector is made of a packed type and is located in front of the outlet pipe.

Description

The solution relates to techniques for wet gas purification from liquid and gaseous harmful impurities and can be used in chemical, energy, food and other industries in need of gas purification.

A device for gas purification, including a column, the axis of which a Venturi pipe is installed. A venturi pipe contains a confuser, a neck, a diffuser and a centrifugal droplet eliminator, a cowl located in the lower part of the diffuser, and an annular tray attached to the lower part of the cowl and having liquid outlet pipes. The droplet eliminator is installed at a distance from the column wall of 0.1-0.25 of the diameter of the column (USSR copyright certificate No. 578093, IPC B01D 47/10, 1977).

The disadvantage of this device is the high content of liquid droplets in the outlet air stream.

Known coagulation-centrifugal wet dust collector, comprising a housing, inside which there is a Venturi pipe with a spray nozzle and a twisting device. The twisting device is made in the form of a cylindrical nozzle equipped with spiral blades on the outer and inner surfaces. On the device axis there is a divider with a cone in the lower part, forming spiral channels with blades (USSR author's certificate No. 410799, IPC B01D 47/10, 1974).

The disadvantage of this device is the low efficiency of the separation of droplets of liquid and air, as a result of which the purified gas is re-polluted.

The closest to the invention in technical essence and the achieved positive effect is a scrubber containing a vertical cylindrical body, equipped with inlet and outlet nozzles in the upper part, a verturi with a nozzle vertically located in the housing, a centrifugal droplet separator located under the venturi, a rotary chamber with a drain nozzle partially filled with liquid and located in the lower part of the housing. An additional droplet eliminator in the form of a scapular swirler is installed in the middle part of the casing (RF patent for invention No. 2027486, IPC B01D 47/10, 1995).

This scrubber cleans the air well from liquid droplets with heavy contaminants, but does not provide reliable coagulation of fine dust and acid gases.

The technical result consists in improving the quality of gas purification.

The specified technical result is achieved in that the scrubber containing a vertical cylindrical body, equipped with inlet and outlet pipes in the upper part, a venturi pipe located vertically inside the body, connected to the inlet pipe and provided with a spray, a rotary chamber with a drain pipe, partially filled with liquid and located in the lower part of the housing, the droplet eliminator, according to the decision, at least one swirler, at least one chipper and at least one a nozzle, and a droplet eliminator is made of a packed type and is located in front of the outlet pipe.

The inventive scrubber is illustrated in the drawing, where:

1 - inlet pipe;

2 - confuser;

3 - water pump;

4 - neck;

5 - diffuser;

6 - rotary camera;

7 - the first swirl;

8 - the first chipper;

9 - nozzle of the first level;

10 - second swirler;

11 - the second chipper;

12 - nozzle of the second level;

13 - liquid pump;

14 - rib;

15 - droplet eliminator;

16 - outlet pipe;

17 - drain pipe;

18 - valve.

The scrubber contains a hollow cylindrical body-column, inside which a Venturi pipe is located, consisting of a confuser 2, a diffuser 5 and a neck 4. The confuser 2 located in the upper part of the Venturi pipe is connected to an inlet pipe 1 passing through the column wall and designed to supply of the cleaned air flow. The outer surface of the confuser is equipped with ribs 14, which serve to precipitate droplets of irrigation fluid, as well as to improve heat transfer. Inside the confuser there is a water atomizer connected to the water pump 3. In the upper part of the casing-column there is a droplet eliminator 15 equipped with an outlet pipe 16 for discharging purified air from the scrubber. The first and second stages of air purification are located in the central part of the column body, each of which respectively contains elements arranged sequentially from top to bottom: nozzles 9 and 12, chippers 8 and 11, blade inertial swirls 7 and 10. Nozzles 9 and 10 are designed for atomizing alkaline solution and connected to the liquid pump 13 through pipelines equipped with shut-off valves 18. In the lower part of the scrubber is a rotary chamber 6, partially filled with liquid, equipped with a drain pipe 17.

Scrubber works as follows. The contaminated gas-air stream through the inlet pipe 1 enters the venturi of the venturi 2, where, for its abundant irrigation under the action of the pump 3, water enters through the atomizer, the water drops are crushed and mixed with the gas-air stream to form a gas-liquid mixture. From the confuser, the flow enters the neck 4, when passing through it, the flow rate of the contaminated gas-liquid mixture increases, increasing the intensity of mixing water and air. From the mouth, the flow enters the venturi diffuser 5, where coagulation of water droplets with dust in the polluted air takes place. The coagulated particles exit the diffuser together with the air flow and enter the rotary chamber 6, in which the gas-air flow is rotated 180 degrees. Heavy coagulated particles of dust do not have time to change the direction of their movement, hit the surface of the water in the chamber and remain in it.

The pre-cleaned air stream from the rotary chamber enters the first stage of air purification - passes through the blade inertial swirler 7, and then through the annular channel formed by the chipper 8 and the scrubber column body. On top of the fenders from the nozzles 9 under the action of the pump 13 receives a liquid, which is an aqueous solution of alkali. Oncoming gas-air and liquid flows form a plentiful foam with a large surface of mass transfer and mass transfer, which contributes to a high degree of purification from suspended and absorption of acid gases, if any, in the stream. After the first stage of purification, the gas-air flow enters the second: passes through the swirl 10, then through the annular channel formed by the chipper 11 and the scrubber body and similarly is irrigated with liquid from the nozzles 12 under the pressure of the pump 13. The flow rate of the irrigation liquid in the first and second stages of cleaning coming out of nozzles 9 and 12 of the first and second levels, respectively, are controlled by valves 18. Above the swirler 10 and the chipper 11 there is a free zone for the foam to settle and to free the gas-air stream from the irrigation drops barrier liquid. Small droplets of irrigating liquid settle both on the walls of the scrubber and on the blades of the external fins of the venturi of the Venturi pipe 14, finally the gas-air stream is cleaned of drops in the droplet eliminator 15 of the nozzle type, after which it leaves the scrubber cleaned through the outlet pipe 16. Irrigating liquid with trapped suspended particles (dust) and absorbed acid gases accumulated in the rotary chamber 6, is removed through the drain pipe 17.

The inventive scrubber is compact in connection with the combination of a coagulation cleaner (Venturi pipe), an inertial cleaner (rotary chamber with liquid) and an adsorption cleaner (two stages of cleaning with alkaline foam) in one housing. It provides a high degree of purification even at low gas flow rates, and also allows the use of various types of cleaning liquids - water for coagulation of dust in a Venturi pipe and an aqueous alkali solution for the absorption of acid gases in swirls and chippers.

In the case of purification of hot gases, the fins 14 located on the confuser act as coolers, in this case an air-conditioned gas-air flow enters the rotary chamber, thereby ensuring stable operation. The presence of blades of the external fins of the venturi pipe confuser intensifies the cooling process of the incoming gas-air stream and at the same time removes droplet moisture from the gas-air stream leaving the scrubber.

Regulation of the fluid supply from the pump 13 to the nozzles 9 and 12 using the valves 18 provides the possibility of redistributing the flow of irrigation fluid between the first and second stages to obtain increased absorption of acid gases.

If there is no need to clean the gas-air stream from acid gases, only industrial water supplied by one single pump can be used as an irrigation liquid.

It is possible to perform a scrubber with one cleaning step. In this case, in the central part of the column body on the outside of the venturi, the following elements are arranged sequentially from top to bottom: one row of nozzles (at least one nozzle), a chipper, a blade inertial swirl.

Claims (1)

A scrubber comprising a vertical cylindrical body provided with inlet and outlet nozzles in the upper part, a Venturi pipe located vertically inside the body, connected to the inlet pipe and provided with a spray, a rotary chamber with a drain pipe, partially filled with liquid and located in the lower part of the body, a droplet eliminator, characterized in that at least one swirler, at least one chipper and at least one nozzle are arranged in series in the central part of the housing, and the pre-collector is made of a packed type and is located in front of the outlet pipe.