Ring type water film type exhaust gas absorbing device

Abstract

The application provides a ring type water film exhaust gas absorption device, solves the problems of unreliable operation, unreasonable setting mode, low absorption efficiency and large water consumption of the exhaust gas absorption device in a traditional industrial exhaust gas absorption tower, and the technical scheme is as follows: the water film exhaust gas absorption device body is externally a vertical cylindrical inner sleeve tower section, the inner sleeve tower section is internally provided with a funnel-shaped water film unit composed of a plurality of water film ring grooves which are arranged around and gradually reduce in height from the periphery to the center part through a support frame, the water film ring grooves adjacent to each other are staggered, and the gap left between the adjacent water film ring grooves is used to form an annular water vapor flow guide channel; a cyclone disc with flow guide blades is arranged at the bottom of the inner sleeve tower section, and a cyclone cavity is arranged between the cyclone disc and the water film unit, which greatly improves the absorption efficiency, realizes dead angle-free absorption, prevents the components from being blocked due to corrosion, enables long-term effective use, greatly reduces the water consumption, and fully implements the state's policy of saving and reducing emissions.

Description

TECHNICAL FIELD

[0001] The present application relates to industrial exhaust gas treatment equipment, in particular to a ring type water film exhaust gas absorption device, which is suitable for being assembled in various exhaust gas absorption towers and is used for recycling or wet dust removal of harmful substances in industrial exhaust gas. BACKGROUND

[0002] At present, the traditional spray absorption method is generally used in China, that is, a spray pipe is arranged in a spray absorption tower, and industrial exhaust gas is sent into the absorption tower by an air blower for spray absorption, the absorption liquid formed is discharged after neutralization treatment, and the purified exhaust gas is discharged through a filtering device at the top of the absorption tower. However, the absorption tower has the following problems: the spray absorption liquid is difficult to fully absorb the exhaust gas, the water consumption is large, the absorption efficiency is low, and the exhaust gas discharged from the absorption tower after treatment cannot meet the emission standard. The patent document with the publication number CN204017639U discloses a water film acid mist absorption device, which is installed in an exhaust gas absorption tower and forms a water film structure by a plurality of trays, a flow guide cover and a flow guide pipe. The absorption liquid is discharged downward through an overflow pipe. The water film structure changes the absorption mode of the absorption liquid into the exhaust gas, thereby improving the absorption efficiency. However, the absorption mode is single, a plurality of water film structure units need to be arranged, and the exhaust gas to be filtered and purified is guided to pass through the water film from bottom to top layer by layer through the flow guide pipe and the flow guide cover, thereby increasing the water consumption and being difficult to improve the absorption efficiency. The present application further improves the absorption efficiency of the exhaust gas, thereby meeting the higher emission standard requirements. SUMMARY

[0003] The present application aims to provide a ring type water film exhaust gas absorption device, which solves the problems of unreliable operation, unreasonable arrangement, low absorption efficiency and large water consumption of the exhaust gas absorption device in the traditional industrial exhaust gas absorption tower. The ring type water film device improves the absorption efficiency of the exhaust gas absorption liquid into the exhaust gas and saves water.

[0004] The technical scheme adopted by the present application is as follows: the ring type water film exhaust gas absorption device comprises a water film exhaust gas absorption device body arranged in an exhaust gas absorption tower, and the technical key points are as follows: the outer part of the water film exhaust gas absorption device body is a vertical cylindrical inner sleeve tower section, the inner part is provided with a funnel-shaped water film unit composed of a plurality of water film ring grooves arranged around the outer periphery and gradually decreasing in height from the center part to the outer periphery by a support frame, the water film ring grooves adjacent to each other are arranged in a staggered manner, and the gap between the adjacent water film ring grooves is used to form a ring-shaped water vapor flow guide channel; a cyclone disc with flow guide blades is arranged at the bottom of the inner sleeve tower section, and a cyclone cavity is arranged between the cyclone disc and the water film unit; a circular ring cavity is arranged between the inner sleeve tower section and the outer wall of the absorption tower body, and the upper part of the circular ring cavity is sealed; and the bottom of the inner sleeve tower section is an air inlet.

[0005] The inner sleeve tower section is provided with at least two funnel-shaped water film units.

[0006] The water film ring groove is wide at the top and narrow at the bottom.

[0007] The water film ring groove is V-shaped, semicircular, U-shaped or inverted trapezoidal in cross section.

[0008] The inner sleeve tower section is cylindrical, and the water film ring groove is a circular funnel.

[0009] The center of the water film ring groove is provided with a small funnel-shaped water film groove with a closed bottom.

[0010] The present application has the advantages and positive effects that: due to the fact that the present application adopts the method of arranging multiple surrounding water film ring grooves in the inner sleeve tower section to form funnel-shaped water film units, and forming annular water vapor guide channels between adjacent water film ring grooves, the sprayed or injected full tail gas absorption liquid can overflow to form water film rings covering the outer walls of the water film ring grooves, and a larger water film surface area is formed, and the water film rings can absorb the tail gas passing through the water vapor guide channels; the cyclone disc arranged at the lower part of the inner sleeve tower section can form a rotating upward vortex flow of the rising tail gas, and the tail gas is guided by the cyclone disc and rotates and centrifugally moves when passing through the blades, and a vortex flow is formed in the cyclone chamber, and the absorption liquid falls from above and is uniformly distributed to each blade of the cyclone disc, and a larger water film surface area is formed, and through the combination of the water film ring groove and the cyclone disc, the rotating upward exhaust gas vortex and the water film on the blades, the water film rings on the outer walls of the water film ring grooves and the absorption liquid dripping in the cyclone chamber move relatively in the inner sleeve tower section, so that the tail gas and the water film are more fully contacted, the annular water vapor guide channel further reduces the resistance of the upward flow of the tail gas, thereby greatly improving the absorption efficiency, and the absorption is performed without dead angle, and the water consumption is greatly reduced, and the national policy of saving and reducing is fully implemented. BRIEF DESCRIPTION OF DRAWINGS

[0011] The present application will be further described below with reference to the accompanying drawings.

[0012] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0013] Figure 2 is a structural schematic diagram of adjacent water film ring grooves of an embodiment of the present application;

[0014] Figure 3 is a structural schematic diagram of the water film ring groove bottom A of Figure 1 ;

[0015] Figure 4 is a structural schematic diagram of a water film ring groove support frame of an embodiment of the present application;

[0016] Figure 5 is a structural schematic diagram of a cyclone disc of an embodiment of the present application;

[0017] Figure 6 is a structural schematic diagram of another embodiment of the present application;

[0018] Figure 7 is a structural schematic diagram of an installed state of an embodiment of the present application;

[0019] Figure 8 is Figure 7 an enlarged view of part B of

[0020] The figure number explanation: 1 inner sleeve tower section, 2 water film unit, 201 water film ring groove, 3 support frame, 4 small funnel-shaped water film groove, 5 cyclone cavity, 6 cyclone disc, 601 blade, 7 inner sleeve tower section upper edge, 8 absorption tower body outer wall, 9 annular cavity, 10 water vapor guide passage, 11 absorption tower, 12 spray type tail gas absorption device, 13 absorption tower exhaust gas inlet, 14 overflow port, 15 water sump, 16 emptying port, 17 absorption liquid circulation outlet, 18 absorption liquid circulation pipeline, 19 corrosion-proof pump, 20 control valve, 21 absorption liquid, 22 tail gas. DETAILED DESCRIPTION

[0021] According to Figures 1-8 a detailed description of the specific structure of the present application, as Figure 1 shown, a ring type water film tail gas absorption device, which is used to be installed in various industrial exhaust gas absorption towers, serves as the main absorption industrial tail gas device in the absorption tower. The outer part of the water film tail gas absorption device body is a vertical cylindrical inner sleeve tower section 1, and the inside is provided with a funnel-shaped water film unit 2 through a support frame 3, as Figure 1 and Figure 2 shown, the funnel-shaped water film unit is formed by a plurality of water film ring grooves 201 surrounding each other in a large ring and small ring structure, the adjacent water film ring grooves 201 inside and outside are staggered, gradually reducing in height from the periphery to the center part, and arranged in a funnel shape. There is an annular gap between adjacent water film ring grooves, which forms an annular water vapor guide passage 10, which can make the absorption liquid overflowed by the water film ring groove flow out, and at the same time can make the tail gas upward airflow guide out. As Figure 3 and Figure 4 shown, the support frame 3 can be combined by a plurality of supports or vertical plates, and the upper support end is adapted to the shape of the bottom of the water film ring groove. As Figure 5As shown, a cyclone disc 6 with guide vanes 601 is arranged at the bottom of the inner sleeve tower section 1. The cyclone disc is a commercially available air guide device for guiding the passing airflow into a rotating airflow, and there are guide flow channels between each guide vane. A cyclone cavity is arranged between the cyclone disc 6 and the water film unit 2, which facilitates the formation of a rotating vortex when the exhaust gas rises. Industrial exhaust gas absorption towers usually use a spraying method or a pipe water injection method to fill the absorption liquid into the exhaust gas absorption device in the absorption tower. In this embodiment, a spraying type exhaust gas absorption device is used to spray water into the water film unit, and water can also be injected into each water film ring groove of the water film unit through a pipe. The inner sleeve tower section 1 is arranged below the spraying pipe of the spraying type exhaust gas absorption device, and the upper edge 7 of the inner sleeve tower section extends outward, and the outer edge is sealed with the outer wall 8 of the absorption tower body; the bottom of the inner sleeve tower section is an air inlet, which can allow the industrial exhaust gas to flow in.

[0022] More specifically, as shown in Figure 2 , the water film ring groove 201 of this embodiment is gradually narrowed at the bottom, and the cross section of the water film ring groove can adopt a shape that is wide at the top and narrow at the bottom, which can better enable the water overflowing from the water film ring to flow along the outer wall of the water film ring under the action of surface tension, thereby forming a uniform water film that wraps around the water film ring. In this embodiment, a V shape is used, but a semicircular shape, a U shape, or a trapezoidal shape can also be used. A small funnel-shaped water film groove 4 with a closed bottom can also be arranged at the center of the funnel-shaped water film unit 2, which can hold the absorption liquid and form a water film after overflowing. The inner sleeve tower section of this embodiment is cylindrical, and the water film ring groove forms a circular funnel; the inner sleeve tower section can also be square, and the water film ring groove forms a square funnel, which can adapt to absorption towers of different shapes.

[0023] As a further improvement, as shown in Figure 6 , the inner sleeve tower section 1 is provided with at least two layers of funnel-shaped water film units 2, which can increase the area of the water film formed, further absorb the exhaust gas layer by layer, increase the absorption effect, and adapt to large absorption towers.

[0024] Working process and principle: as shown in Figure 7 , the ring type water film exhaust gas absorption device is arranged in a spraying type industrial exhaust gas absorption tower 11 when in use. The bottom of the absorption tower is a water tank 15 for collecting absorption liquid, and the lower part is provided with an absorption liquid circulation outlet 17, a vent 16, and an overflow port 14. The side wall is provided with an exhaust gas inlet 13 of the absorption tower, which is used to guide the exhaust gas 22 into the absorption tower. The exhaust gas 22 is Figure 7 and Figure 8 indicated by dashed lines with arrows, and the middle part is provided with an inner sleeve tower section 1 of the ring type water film exhaust gas absorption device. The upper part is a spraying type exhaust gas absorption device 12, and the upper end is provided with an exhaust gas outlet. The spraying type exhaust gas absorption device 12 and the absorption liquid circulation outlet 17 are connected by an external absorption liquid circulation pipeline 18 with a corrosion-resistant pump 19 and a control valve 20.

[0025] When working, the industrial exhaust gas flows in the following direction: from the inlet 13 of the absorption tower, the exhaust gas 22 first enters the annular cavity 9, and since the upper end of the annular cavity is closed, the exhaust gas can only flow to the gap between the water tank 15 and the inner sleeve tower joint 1, and then enters the gas inlet of the annular water film type exhaust gas absorption device from below and rises, and the exhaust gas first passes through the cyclone disc 6, rotates and rises under the guidance of the guide vane, and forms an upward vortex flow in the cyclone cavity, and then passes through the annular water vapor guide passage of the funnel-shaped water film unit 2, is absorbed layer by layer through the water film, and then continues to rise through the spray type exhaust gas absorption device 12, and finally is discharged from the exhaust gas outlet of the absorption tower.

[0026] The flow direction of the absorption liquid is: the absorption liquid enters the spray type exhaust gas absorption device 12 through the absorption liquid circulating pipeline 18, is sprayed to the funnel-shaped water film unit 2 of the annular water film type exhaust gas absorption device through the spray pipe, the water film ring groove is filled with absorption liquid, and the water film ring formed on the outer wall of the water film ring groove continues to flow downward to the blades of the cyclone disc 6, and also forms a water film layer, and then flows downward into the water tank 15 at the bottom of the absorption tower, and then enters the absorption liquid circulating pipeline 18 for recycling, and is recycled and utilized after reaching the specified concentration.

[0027] After the sprayed absorption liquid falls from the spray pipe, it uniformly fills the water film ring groove, and the continuous supply of the spray absorption liquid ensures that the water film ring groove is always in a full water state, and the water overflowing from the water film ring groove will flow along the outer wall of the water film ring under the action of surface tension, thereby forming a uniform thin liquid layer with a thickness of 3-8 mm around the water film ring groove, i.e. forming a water film ring, such as Figure 8As shown, the flow direction of the absorption liquid is indicated by dotted arrows, and the flow direction of the exhaust gas is indicated by solid arrows, the exhaust gas contacts the water film ring from below, the main mechanism is the inertial collision and adhesion of dust particles, exhaust gas and liquid drops, the water film ring covers the space of the absorption tower body, ensuring that the exhaust gas contacts the water film 100%, the upward vortex flow of the exhaust gas contacts the water film ring and is sprayed into fine droplets, thereby further improving the absorption effect, the exhaust gas passes through the annular water vapor guide channel between adjacent water film ring grooves after contacting the water film ring, the water film ring forms a water film with a large surface area; When the exhaust gas passes through the blades of the cyclone disc, it produces rotation and centrifugal motion, forming a vortex in the cyclone chamber, the absorption liquid falls from above and is evenly distributed to each blade of the cyclone disc, forming a water film with a large surface area, through the combination of the water film ring groove and the cyclone disc, the upward rotating exhaust gas vortex contacts the water film on the blade, the water film on the outer wall of the water film ring groove, and the absorption liquid falling in the cyclone chamber, and the relative motion in the inner sleeve tower section, the annular water vapor guide channel reduces the resistance of the exhaust gas flowing upward, so that the exhaust gas and the water film are more fully contacted, thereby greatly improving the absorption efficiency, and the absorption is dead angle-free, and the water saving effect is achieved, and because no guide pipe is used to form a water film or a spray pipe to spray the absorption exhaust gas, the parts are greatly avoided from being corroded and blocked, and can be used effectively for a long time, the parts will not be corroded and blocked, and the water consumption is greatly reduced, the water consumption of the device is 1-3 cubic meters, the exhaust gas is contacted with the water film through multiple layers of water film, there is no dead angle, the absorption effect is good, after 24 hours of sampling at the chimney outlet, multiple analysis tests all meet the national emission standard, and the national saving and emission reduction policy is fully implemented.

[0028] In summary, the purposes of the present application are achieved.

Claims

1. A ring type water film exhaust absorption device, comprising a water film exhaust absorption device body arranged in an industrial emission exhaust absorption tower, characterized in that: The water film type tail gas absorption device body is a vertical cylindrical inner sleeve tower section, and a funnel-shaped water film unit composed of a plurality of circumferentially arranged water film ring grooves gradually reducing in height from the periphery to the center is arranged in the inner sleeve tower section through a support frame, the adjacent water film ring grooves are staggered, an annular water vapor flow channel is formed by the gap between the adjacent water film ring grooves, a water film ring is formed on the outer wall of the water film ring groove, and the inner sleeve tower section is provided with at least two layers of funnel-shaped water film units; a cyclone disc with guide vanes is arranged at the bottom of the inner sleeve tower section, and a cyclone cavity is arranged between the cyclone disc and the water film unit; a circular ring cavity is arranged between the inner sleeve tower section and the outer wall of the absorption tower body, and the bottom of the inner sleeve tower section is an air inlet.

2. The ring-type water film exhaust absorption device according to claim 1, characterized in that: The water film ring groove is wide at the top and narrow at the bottom in cross section.

3. The ring-type water film exhaust absorption device according to claim 2, characterized in that: The water film ring groove is V-shaped, semicircular, U-shaped or trapezoidal in cross section.

4. The ring-type water-membrane exhaust gas absorption device according to claim 1, characterized in that: The inner sleeve tower section is cylindrical, and the water film ring grooves form a circular funnel shape.

5. The ring-type water-membrane exhaust gas absorption device according to claim 1, characterized in that: A small funnel-shaped water film groove with a closed bottom is arranged at the center of the water film ring groove.

6. The ring-type water-membrane exhaust gas absorption device according to claim 2, characterized in that: The inner sleeve tower section is cylindrical, and the water film ring grooves form a circular funnel shape; a small funnel-shaped water film groove with a closed bottom is arranged at the center of the water film ring groove.

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