A tower plate for a cross-flow ash tail gas washing tower and a washing tower

Abstract

The present invention discloses a tower plate and a washing tower for a flow-through ash tail gas washing tower, wherein the tower plate is fixedly arranged inside the washing tower, and a plurality of first air holes are opened on the tower plate, and the tower plate also includes: a gas lift cylinder, which is arranged at the top of the tower plate, and the top wall of the gas lift cylinder is convex and has a plurality of second air holes, and the bottom end of the gas lift cylinder is connected with the first air holes; a drainage pipe, which is arranged at the outer edge of the top of the tower plate, and the pipe wall of the drainage pipe and the tower plate are jointly enclosed to form a water guide groove, and the water inlet of the drainage pipe is located above the tower plate, and the water outlet is connected with the bottom of the tower plate; the tail gas passes through the first air hole and the second air hole in turn and can contact the washing water sprayed from the top of the washing tower on the upper surface of the top wall. Through the disclosure of the present invention, the problem of tower plate hole blockage can be solved while improving the gas-liquid mass transfer efficiency inside the washing tower.

Description

Technical Field

[0001] The invention relates to the technical field of chemical engineering tower internals, and more specifically to a tower plate for a through-flow ash tail gas washing tower and a washing tower. Background Art

[0002] To obtain lime milk in the ash machine, it is necessary to digest quicklime and water (lime water). During the reaction, a large amount of reaction heat will be released, and the added quicklime and water have a certain temperature. During the reaction, a large amount of steam and fine particles Ca(OH) will be generated. 2 Dust is discharged into the air. If it contains Ca(OH) 2 Dust exhaust gas is directly discharged into the atmosphere, which not only affects the health of workers, but also causes dust pollution to the surrounding environment. The existing treatment process is that washing water flows into the tower plate from the water inlet to form a certain original liquid layer. The exhaust gas flows upward from the air inlet of the washing tower through the suction of the induced draft fan and evenly passes through the small holes on the tower plate and is dispersed in the liquid. A large amount of foam is generated when bubbling out. The exhaust gas and the washing water are fully contacted and washed in the foam layer. The purified exhaust gas from the washing tower is discharged into the atmosphere through the induced draft fan. However, the residue flowing down after the exhaust gas is washed remains on the tower plate and contacts the air to produce calcium carbonate precipitation, causing the tower plate of the washing tower to be blocked, affecting the working efficiency of the washing tower. At the same time, in the existing technology, the gas-liquid mass transfer efficiency inside the washing tower is low, affecting the washing effect.

[0003] In view of this, it is necessary to improve the washing tower structure in the prior art to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to disclose a tower plate and a washing tower for a through-flow ash tail gas washing tower, which solves the problem of tower plate hole blockage by arranging an air lift cylinder, and then solves the solid precipitation that continuously accumulates on the tower plate by using a leakage pipe, and finally solves the wall flow problem caused by the leakage pipe design by using a water flow redistributor, thereby improving the gas-liquid mass transfer efficiency of the tower plate while solving the problem of tower plate hole blockage.

[0005] To achieve the above object, the present invention provides a tower plate for a flow-through ash tail gas washing tower, wherein the tower plate is fixedly arranged inside the washing tower, and a plurality of first air holes are opened on the tower plate;

[0006] The tower plate further comprises: a gas lift cylinder, which is arranged at the top of the tower plate, the top wall of the gas lift cylinder is convex and has a plurality of second air holes, and the bottom end of the gas lift cylinder is connected to the first air holes;

[0007] A discharge pipe is arranged at the outer edge of the top end of the tower plate. The pipe wall of the discharge pipe and the tower plate together enclose a water guide groove. The water inlet of the discharge pipe is located above the tower plate, and the water outlet is connected to the bottom of the tower plate. The exhaust gas passes through the first air hole and the second air hole in sequence and can contact the washing water sprayed from the top of the washing tower on the upper surface of the top wall.

[0008] As a further improvement of the present invention, the lift cylinder is cylindrical, with an open bottom and an elliptical capping structure at the top.

[0009] As a further improvement of the present invention, the height of the lift cylinder is 30-50 mm higher than the height of the tower plate.

[0010] As a further improvement of the present invention, a plurality of the lift cylinders are provided with flow-guiding gaps whose spacing gradually increases from the center direction of the tower plate toward the outer end direction of the tower plate.

[0011] As a further improvement of the present invention, a gap is left between the drainage pipe and the tower wall of the washing tower, and the water inlet is opened on the side of the drainage pipe facing the air lift cylinder and away from the air lift cylinder.

[0012] The present invention also discloses a through-flow ash removal tail gas washing tower, based on a tower plate for a through-flow ash removal tail gas washing tower, the washing tower further comprises:

[0013] A water flow redistributor is arranged below the tower plate. The outer edge of the water flow redistributor is connected to the inner wall of the washing tower and is used to guide the water flow formed on the tower wall of the washing tower to the washing tower. A plurality of water outlet holes are provided on the water flow redistributor to change the spatial distribution state of the water flow falling in the washing tower.

[0014] As a further improvement of the present invention, a chute is further provided on the wall of the washing tower, and the water flow redistributor comprises:

[0015] A funnel-shaped body, wherein the water outlet is located on the inner wall of the body, and a roller is rotatably connected to the outer wall of the top end of the body, and the roller and the slide groove form a sliding fit;

[0016] A connecting shaft, fixedly disposed vertically at the bottom end of the body;

[0017] A first rotating blade unit is fixedly arranged on the connecting shaft and drives the water flow redistributor to rotate by using the driving force of the rising airflow at the bottom of the washing tower;

[0018] The second rotating blade unit is rotatably arranged on the connecting shaft and is located above the first rotating blade unit. By utilizing the driving force of the falling washing water on the second rotating blade unit, the second rotating blade unit can rotate differentially with the first rotating blade unit in opposite directions.

[0019] As a further improvement of the present invention, the chute is formed by two horizontally arranged annular partitions and the tower wall of the washing tower, and rolling friction is formed between the roller and the chute.

[0020] As a further improvement of the present invention, a plurality of groups of tower plates are arranged at intervals in the vertical direction in the washing tower, and a water flow redistributor is arranged between two adjacent groups of tower plates.

[0021] As a further improvement of the present invention, the first rotating blade unit and the second rotating blade unit each include a plurality of groups of blades which are circumferentially arranged on the outer wall of the connecting shaft.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) A tower plate for a through-flow ash-forming tail gas washing tower, wherein a gas lift cylinder is arranged on the tower plate, the top wall of the gas lift cylinder is convex, and a second air hole is opened on the top wall of the gas lift cylinder so that the contact surface between the gas and the washing water is on the top wall of the gas lift cylinder, that is, on the hemispherical surface, thereby improving the washing efficiency and preventing the reaction product after gas washing from precipitating and clogging the tower plate holes. At the same time, a drainage pipe is arranged on the outer edge of the top of the tower plate so that the drainage pipe and the tower plate are jointly enclosed to form a water guide groove, and a drainage channel communicating with the bottom of the tower plate is also opened on the drainage pipe, thereby ensuring that the precipitation on the tower plate will flow out of the tower plate as the fluid flows; a plurality of gas lift cylinders are formed with a guide gap whose spacing gradually increases from the center direction of the tower plate toward the outer end direction of the tower plate, so as to form a water pressure gradient force in the water guide groove and improve the fluidity of the precipitation on the tower plate.

[0024] (2) A cross-flow ash tail gas washing tower, by arranging a water flow redistributor under the tower plate, to prevent water from flowing out from the four sides of the tower plate, resulting in the formation of wall flow on the tower wall of the washing tower, thereby reducing the gas-liquid mass transfer efficiency and other problems. A funnel-shaped body is used, and a plurality of water outlet holes are opened on the body, so that the water flow is divided by the water flow redistributor, and the distribution state in the space is changed, thereby improving the gas-liquid mass transfer efficiency; at the same time, the second rotating blade unit arranged at the bottom can rotate under the driving of the rising airflow inside the washing tower, which can consume the rising pressure of the bottom airflow on the one hand, and avoid the washing The rising air pressure inside the washing tower is too high, which affects the gas-liquid mass transfer efficiency. On the other hand, the rising pressure of the bottom airflow can be converted into kinetic energy for the rotation of the second rotating blade unit, thereby driving the main body to rotate and improving the uniformity of the water flow to better adapt to the gas under high flow and ensure the mass transfer efficiency; furthermore, the first rotating blade unit is set in the opposite direction and performs differential motion relative to the second rotating blade unit to reduce the force influence of the washing water at the bottom of the tower plate, eliminate the rotational potential energy of the second rotating blade, and avoid the problem that the second rotating blade rotates too fast and the gas-liquid interaction effect in the center of the water redistributor becomes worse. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a half-section perspective schematic diagram of a tower plate for a cross-flow ash tail gas washing tower and a washing tower of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a tower plate for a through-flow ash tail gas washing tower and a water flow redistributor of the washing tower according to the present invention;

[0027] Figure 3 It is a schematic structural diagram of a tower plate for a cross-flow ash tail gas washing tower and a tower plate in a washing tower according to the present invention;

[0028] Figure 4 It is a schematic diagram of the main view of a tower plate for a cross-flow ash tail gas washing tower and a tower plate in a washing tower according to the present invention;

[0029] Figure 5 The invention discloses a tower plate for a cross-flow ash tail gas washing tower and a working principle diagram of the washing tower.

[0030] In the figure: 10, washing tower; 100, chute; 101, tower plate; 102, water redistributor; 1001, annular baffle; 1010, first air hole; 1011, lift cylinder; 1012, discharge pipe; 1013, water guide groove; 1020, water outlet; 1021, body; 1022, roller; 1023, connecting shaft; 1024, first rotating blade unit; 1025, second rotating blade unit; 10110, second air hole; 10121, water inlet; 10122, water outlet; a, tail gas; b, solid precipitation; c, washing water. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0032] Please refer to Figures 1 to 5 A specific implementation of a tower plate for a cross-flow ash tail gas washing tower and a washing tower of the present invention is shown.

[0033] Ginseng Figure 1 Combined with Figure 2-3 As shown, a through-flow ash tail gas washing tower 10 uses a tower plate 101, the tower plate 101 is fixedly arranged inside the washing tower 10, and a plurality of first air holes 1010 are opened on the tower plate 101; the tower plate 101 also includes: a lift cylinder 1011, which is arranged at the top of the tower plate 101, and the top wall of the lift cylinder 1011 is convex and higher than the upper surface of the tower plate 101 by 30-50mm, and a plurality of second air holes 10110 are opened on the top wall, and the second air holes 10110 are circular, with a diameter of 5-10mm, and a hole spacing L1=10-20mm. The bottom end of the lift cylinder 1011 is connected to the first air hole 1010; the discharge pipe 1012 is arranged at the outer edge of the top of the tower plate 101, and the pipe wall of the discharge pipe 1012 and the tower plate 101 are enclosed together to form a water guide groove 1013, the water inlet 10121 of the discharge pipe 1012 is located above the tower plate 101, and the water outlet 10122 is connected to the bottom of the tower plate 101; the tail gas passes through the first air hole 1010 and the second air hole 10110 in sequence and can contact the washing water sprayed on the top of the washing tower 10 on the upper surface of the top wall. The lift cylinder 1011 is cylindrical, with an open bottom and an elliptical capping structure at the top. The height of the lift cylinder 1011 is 30-50mm higher than the height of the tower plate 101. A guide gap is formed between the plurality of lift cylinders 1011, and the spacing gradually increases from the center direction of the tower plate 101 toward the outer end direction of the tower plate 101. A gap is left between the discharge pipe 1012 and the tower wall of the washing tower 10 , and the water inlet 10121 is opened on one side of the discharge pipe 1012 facing the air lift cylinder 1011 and the other side away from the air lift cylinder 1011 .

[0034] It should be understood that a through-flow ash tail gas washing tower 10 uses a tower plate 101, by arranging a gas lift cylinder 1011 on the tower plate 101, the top wall of the gas lift cylinder 1011 is convex, and a second air hole 10110 is opened on the top wall of the gas lift cylinder 1011, so that the contact surface between the gas and the washing water is on the top wall of the gas lift cylinder 1011, that is, on the hemispherical surface, thereby improving the washing efficiency and preventing the reaction product after gas washing from precipitating and clogging the tower plate 101 hole. At the same time, by arranging a discharge pipe 1012 on the outer edge of the top of the tower plate 101 , so that the drainage pipe 1012 and the tower plate 101 are jointly enclosed to form a water guide groove 1013, and the drainage pipe 1012 is also provided with a drainage channel connected to the bottom of the tower plate 101, which ensures that the sediment on the tower plate 101 will flow out of the tower plate 101 with the flow of the fluid; a guide gap with a gradually increasing spacing from the center direction of the tower plate 101 toward the outer end direction of the tower plate 101 is formed between the plurality of lift cylinders 1011, so as to form a water pressure gradient force in the water guide groove 1013, thereby improving the fluidity of the sediment on the tower plate 101.

[0035] Ginseng Figure 1 and Figure 4-5As shown, the present invention also discloses a through-flow ash-removing tail gas washing tower 10, based on a tower plate 101 for a through-flow ash-removing tail gas washing tower 10, the washing tower 10 also includes: a water flow redistributor 102, which is arranged below the tower plate 101, the outer edge of the water flow redistributor is connected to the inner wall of the washing tower 10, and is used to guide the water flow formed on the tower wall of the washing tower 10 to the washing tower 10, and a plurality of water outlet holes 1020 are opened on the water flow redistributor, which are used to change the spatial distribution state of the water flow falling in the washing tower 10. The width of the water outlet hole 1020 matches the first air hole 1010 of the tower plate 101; the hole diameter of the water outlet hole 1020 is 100-150mm, and the spacing between the holes of the water outlet hole 1020 is L2=200-300mm. The cross-section of the water flow redistributor 102 is an isosceles triangle, and the angle between the waistline of the triangle and the vertical line is 30-60 degrees. A chute 100 is also provided on the tower wall of the washing tower 10, and the water redistributor includes: a funnel-shaped body 1021, the top outer wall of the body 1021 is rotatably connected to a roller 1022, and the roller 1022 and the chute 100 form a sliding fit; a connecting shaft 1023, which is vertically fixedly arranged at the bottom of the body 1021; a first rotating blade unit 1024, which is fixedly arranged on the connecting shaft 1023, and uses the driving force of the rising airflow at the bottom of the washing tower 10 to drive the water redistributor 102 to rotate; a second rotating blade unit 1025, which is rotatably arranged on the connecting shaft 1023 and is located above the first rotating blade unit 1024, and uses the driving force of the falling washing water on the second rotating blade unit 1025, so that the second rotating blade unit 1025 can rotate differentially with the first rotating blade unit, and the rotation direction is opposite. The chute 100 is formed by two horizontally arranged annular partitions 1001 and the tower wall of the washing tower 10, and rolling friction is formed between the roller 1022 and the chute 100. Two annular partitions 1001 are added to the upper and lower middle sections of the tower wall. There is a gap of less than 1 cm between the annular partitions 1001 and the roller 1022 to reduce friction and prevent the track from getting stuck. Multiple groups of tower plates 101 are arranged at intervals in the vertical direction in the washing tower 10, and water flow redistributors are arranged between two adjacent groups of tower plates 101. The first rotating blade unit 1024 and the second rotating blade unit 1025 both include multiple groups of blades, which are arranged circumferentially on the outer wall of the connecting shaft 1023.

[0036] It should be understood that a through-flow ash tail gas washing tower 10, by setting a water flow redistributor 102 under the tower plate 101, prevents water from flowing out from the four sides of the tower plate 101, resulting in the formation of wall flow on the tower wall of the washing tower 10, thereby reducing the gas-liquid mass transfer efficiency and other problems. A funnel-shaped body 1021 is used, and a plurality of water outlet holes 1020 are opened on the body 1021, so that the water flow is diverted by the water flow redistributor 102, and the distribution state in the space is changed, thereby improving the gas-liquid mass transfer efficiency; at the same time, the second rotating blade unit 1025 arranged at the bottom can rotate under the drive of the rising airflow inside the washing tower 10, which can consume the rising airflow at the bottom. pressure, so as to avoid excessive rising air pressure inside the washing tower 10, which would affect the gas-liquid mass transfer efficiency. On the other hand, the rising pressure of the bottom airflow can be converted into kinetic energy of the second rotating blade unit 1025 to drive the main body 1021 to rotate, thereby improving the uniformity of the water flow to better adapt to the gas under high flow rate and ensure the mass transfer efficiency. Furthermore, the first rotating blade unit 1024 is set in the opposite direction and performs differential motion relative to the second rotating blade unit 1025, so as to reduce the force influence on the washing water at the bottom of the tower plate 101, eliminate the rotation potential energy of the second rotating blade, and avoid the problem that the second rotating blade rotates too fast and the gas-liquid interaction effect in the center of the water redistributor 102 becomes worse.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A through-flow ash removal tail gas washing tower, based on a tower plate for a through-flow ash removal tail gas washing tower, wherein the tower plate is fixedly arranged inside the washing tower, and a plurality of first air holes are opened on the tower plate, and the tower plate also include: A lift cylinder is arranged at the top of the tower plate, the top wall of the lift cylinder is convex and has a plurality of second air holes, and the bottom end of the lift cylinder is connected to the first air holes; a discharge pipe is arranged at the outer edge of the top of the tower plate, the pipe wall of the discharge pipe and the tower plate are jointly enclosed to form a water guide groove, the water inlet of the discharge pipe is located above the tower plate, and the water outlet is connected to the bottom of the tower plate; the exhaust gas passes through the first air hole and the second air hole in turn and can contact the washing water sprayed from the top of the washing tower on the upper surface of the top wall; it is characterized in that the washing tower also includes: a water flow redistributor, which is arranged below the tower plate, the outer edge of the water flow redistributor is connected to the inner wall of the washing tower, and is used to guide the water flow formed on the tower wall of the washing tower to the washing tower, and the water flow redistributor is provided with a plurality of water outlet holes , used to change the spatial distribution state of water flow falling in the washing tower; a chute is also provided on the tower wall of the washing tower, and the water flow redistributor includes: a funnel-shaped body, the water outlet is located on the inner wall of the body, and the top outer wall of the body is rotatably connected to a roller, and the roller and the chute form a sliding fit; a connecting shaft is vertically fixedly arranged at the bottom of the body; a first rotating blade unit is fixedly arranged on the connecting shaft, and the water flow redistributor is driven to rotate by the driving force of the rising air flow at the bottom of the washing tower; a second rotating blade unit is rotatably arranged on the connecting shaft and is located above the first rotating blade unit. The second rotating blade unit can rotate differentially with the first rotating blade unit, and the rotation direction is opposite by using the driving force of the falling washing water on the second rotating blade unit.

2. A through-flow ash removal tail gas washing tower according to claim 1, It is characterized in that The chute is formed by two horizontally arranged annular partitions and the tower wall of the washing tower, and rolling friction is formed between the roller and the chute.

3. A through-flow ash removal tail gas washing tower according to claim 1, It is characterized in that A plurality of groups of tower plates are arranged at intervals in the vertical direction in the washing tower, and a water flow redistributor is arranged between two adjacent groups of tower plates.

4. A cross-flow ash removal tail gas washing tower according to claim 1, It is characterized in that The first rotating blade unit and the second rotating blade unit each include a plurality of blades arranged circumferentially on the outer wall of the connecting shaft.

5. A cross-flow ash removal tail gas washing tower according to claim 1, It is characterized in that The air lift cylinder is cylindrical, with an opening at the bottom and an elliptical capping structure at the top.

6. A cross-flow ash removal tail gas washing tower according to claim 1, It is characterized in that The height of the lift cylinder is 30-50 mm higher than the height of the tower plate.

7. A cross-flow ash removal tail gas washing tower according to claim 1, It is characterized in that A plurality of the lift cylinders form flow-guiding gaps whose spacing gradually increases from the center direction of the tower plate toward the outer end direction of the tower plate.

8. A cross-flow type ash removal tail gas washing tower according to claim 1, It is characterized in that A gap is left between the drainage pipe and the tower wall of the washing tower, and the water inlet is opened on the side of the drainage pipe facing the air lift cylinder and away from the air lift cylinder.

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