A demisting device and method for flushing a desulfurization absorption tower in a thermal power plant

Abstract

This invention relates to a flushing device and method for a demister in a desulfurization absorption tower of a thermal power plant. The device includes a demister body, which comprises demister components. Each demister module includes multiple corrugated plates arranged at equal intervals inside the demister body and a support plate for fixing the corrugated plates. The demister body also has a flushing structure acting on the corrugated plates. The flushing structure is distributed in the gap between two adjacent corrugated plates. The flushing structure includes a drive water pipe rotatably mounted on the wall of the demister body. Several stop discs are inclinedly installed on the outer arc surface of the drive water pipe. One end of the drive water pipe extends out of the wall of the demister body, and the other end is located inside the demister body and sealed. Several water spray nozzles are opened on the inner wall of the drive water pipe, distributed circumferentially around the drive water pipe and extending tangentially outwards, allowing water to directly spray and cover the entire interior of the demister for cleaning, while simultaneously slowing down the rate of scaling.

Description

Technical Field

[0001] This invention relates to a flushing device and method for a demister in a desulfurization absorption tower of a thermal power plant, belonging to the technical field of gas-liquid separation equipment. Background Technology

[0002] Demisters are widely used in separation towers to remove liquid droplets entrained in gas. They can effectively remove mist droplets from the gas. Since impurities in the liquid droplets are adsorbed onto the demister blades while the demister is separating gas and liquid, a flushing device is needed to wash away the impurities adsorbed on the demister blades. Existing demisters use water spraying from the top or bottom of the demister to flush the demister blades. However, since the demister blades are irregular arc-shaped plates, it is difficult to directly flush the inside of the demister blades with this flushing method, and the flushing effect is not ideal.

[0003] Chinese utility model patent No. 200920234912.X discloses an anti-clogging demister, comprising a demister body consisting of demister blades and a demister frame, and flushing devices disposed at both ends of the demister blades. The demister blades include an inlet section, a front deflector section, a rear deflector section, and an outlet section. The nozzle outlet direction of the flushing device located at the front end of the inlet section of the demister blades is consistent with the direction of the inlet section. Although this utility model enhances the flushing effect, due to the curved shape of the demister blades, the water flow cannot directly spray and cover the entire demister blade, leaving large dead zones that are difficult to flush. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the existing technology, the present invention provides a flushing device and flushing method for the demister of the desulfurization absorption tower in thermal power plants, which enables water to be sprayed directly to cover the entire interior of the demister for cleaning, while slowing down the scaling rate.

[0005] The technical solution of the present invention is as follows:

[0006] A flushing device for a desulfurization absorption tower demister in a thermal power plant includes a demister body. The demister body includes at least one set of demister components. Each set of demister components includes multiple corrugated plates arranged at equal intervals inside the demister body and a support plate for fixing the corrugated plates. The demister body is also provided with a flushing structure acting on the corrugated plates. The flushing structure is distributed in the gap between two adjacent corrugated plates. The flushing structure includes a drive water pipe rotatably disposed on the wall of the demister body. Several stop discs are obliquely installed on the outer arc surface of the drive water pipe. One end of the drive water pipe extends out of the wall of the demister body, and the other end of the drive water pipe is located inside the demister body and is sealed. Several water spray nozzles are opened on the inner wall of the drive water pipe, and the water spray nozzles are distributed around the circumference of the drive water pipe and extend outward tangentially.

[0007] The flushing structure further includes a sliding water pipe slidably disposed on the wall of the demister body. One end of the sliding water pipe extends out of the wall of the demister body, and the other end of the sliding water pipe is located inside the demister body. The sliding water pipe is located above the drive water pipe, and several evenly distributed nozzles are disposed below the sliding water pipe. The top of each stop disc is sandwiched between two adjacent nozzles.

[0008] The flushing structure further includes a sliding water pipe. The driving water pipe is rotatably mounted on the outer wall of the demister body with two first bearings. A fixing rod is mounted on the top of the first bearing, and a sliding sleeve is mounted on the top of the fixing rod. The two ends of the sliding water pipe are slidably mounted in the two sliding sleeves. The sliding water pipe is located above the driving water pipe, and several evenly distributed nozzles are mounted below the sliding water pipe. The top of each stop disc is sandwiched between two adjacent nozzles.

[0009] The sliding water pipe is equipped with a support rod at its top, and a connecting rod is connected to the top of the support rod via a universal joint. A rotating ring is connected to the end of the connecting rod, and a second bearing is connected to the center of the rotating ring via a connecting rod. An L-shaped mounting wall is rotatably mounted on the second bearing, and the other end of the L-shaped mounting wall is fixed to the wall of the demister body. A striking hammer is provided on the side wall of the rotating ring, and the striking hammer rotates through the rotating ring and strikes the surface of the corrugated plate.

[0010] The support plate is provided in two parts, which are respectively arranged horizontally at the upper and lower ends of the demister body. Several ear plates are provided on the top of the support plate, and the end of the corrugated plate is arranged between two adjacent ear plates. The corrugated plate is slidably installed with the support plate.

[0011] The drive water pipe has a threaded groove on the inner wall of the demister body.

[0012] The water spray nozzles are evenly distributed within the threaded grooves.

[0013] The two ends of the water nozzle are squeezed inward to form a Venturi channel.

[0014] The number of the stop discs is at least the same as the number of gaps formed by adjacent nozzles.

[0015] A method for rinsing a demister includes the following steps:

[0016] S1: A high-pressure water source is connected to one end of the drive water pipe that extends out of the wall of the demister body. The water flow mixed with scale inhibitor is sprayed into the drive water pipe under high pressure. After the water flow enters the drive water pipe, it flows in a swirling manner towards the spray nozzle along the spiral groove.

[0017] S2: After the water flow is accelerated through the Venturi channel, it is sprayed out at high speed from the nozzle along the tangential direction. The nozzle adopts a scattering spray method, and the sprayed water flow simultaneously drives the drive water pipe to rotate.

[0018] S3: The drive water pipe rotates, causing several baffles installed at an angle on its outer arc surface to rotate in a figure-eight shape. The rotating baffles block the rising flue gas at the bottom.

[0019] S4: The top of the baffle disc is sandwiched between two adjacent nozzles below the sliding water pipe. The figure-eight rotation of the baffle disc causes the sliding water pipe to move repeatedly to the left and right ends. The water entering from the sliding water pipe is sprayed out from the nozzle and sprayed onto the baffle disc. Under the Coanda effect, a diffuse water curtain is formed to obstruct the rising flue gas.

[0020] S5: When the sliding water pipe moves repeatedly to the left and right ends, the rotating ring is driven to rotate along the second bearing at a certain angle through the support rod, universal joint and connecting rod and continuously rotate back and forth, so that the hammer rotates back and forth and strikes the surface of the corrugated plate, so that the droplets condensed on the surface of the corrugated plate are separated.

[0021] The present invention has the following beneficial effects:

[0022] This invention uses a high-pressure water jet to drive the water pipe to rotate, which in turn causes the inclined baffle disc on the water pipe to rotate in a figure-eight shape. The rotating baffle disc will block the rising smoke from the bottom.

[0023] At the same time, as the gear shift disc rotates, it will drive the top sliding water pipe to move repeatedly to the left and right. The nozzle at the bottom of the sliding water pipe will work with the gear shift disc to form a diffused water curtain under the Coanda effect. The rising flue gas is blocked by the water curtain. After being sprayed in the lower spray layer, it can also be blocked again through the interior of the upper demister.

[0024] Secondly, the sliding water pipe moves repeatedly to the left and right ends and drives the hammer to continuously strike the corrugated plate through the connecting rod above. The striking causes the droplets to be separated from the surface of the corrugated plate, which can accelerate the process of sliding down and dripping, reduce the probability of the flue gas re-attaching harmful substances, and at the same time reduce the number of droplets on the surface of the corrugated plate, so that the next round of droplet adsorption can be carried out quickly. The less contact time can also prevent the surface of the corrugated plate from clumping. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the flushing structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the demister body of the present invention;

[0027] Figure 3 This is a schematic diagram of the striking hammer structure of the present invention.

[0028] The reference numerals in the figure are as follows:

[0029] 1. Demister body; 2. Corrugated plate; 3. Support plate; 4. Drive water pipe; 5. Gear plate; 6. Universal joint; 7. Sliding water pipe; 8. Nozzle; 9. Support rod; 10. Connecting rod; 11. Rotating ring; 12. Second bearing; 13. L-shaped mounting wall; 14. Striking hammer; 15. Ear plate; 16. Threaded groove. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0031] Please see Figures 1 to 3 The invention provides a technical solution:

[0032] A flushing device for a desulfurization absorption tower demister in a thermal power plant includes a demister body 1. The demister body 1 includes at least one set of demister components. Each set of demister components includes multiple corrugated plates 2 arranged at equal intervals inside the demister body 1 and a support plate 3 for fixing the corrugated plates 2. The demister body 1 is also provided with a flushing structure acting on the corrugated plates 2. The flushing structures are distributed in the gaps between two adjacent corrugated plates 2, and several sets of flushing structures can be provided in the gaps between two adjacent corrugated plates 2. The flushing structure includes a drive water pipe 4 rotatably mounted on the wall of the demister body 1. Several baffle discs 5 are inclinedly installed on the outer arc surface of the drive water pipe 4. One end of the drive water pipe 4 extends out of the wall of the demister body 1, and the other end of the drive water pipe 4 is located inside the demister body 1 and is sealed. The wall surface is provided with several water spray nozzles, which are distributed around the circumference of the drive water pipe 4 and extend outward tangentially. When the end of the drive water pipe 4 that passes through the wall surface of the demister body 1 rotates and sprays water inward at high pressure, the high-frequency jet mixed with the scale inhibitor enters the drive water pipe 4 together. As a preferred embodiment, the drive water pipe 4 is provided with a threaded groove 16 on the inner wall surface of the demister body 1, and the water spray nozzles are evenly distributed in the threaded groove 16. The two ends of the water spray nozzles are squeezed inward to form a Venturi channel. After the high-frequency jet enters the drive water pipe 4, it flows into the water spray nozzle in a swirling manner along the threaded groove 16 and sprays outward. During the spraying process, it is accelerated through the Venturi channel and sprayed out at high speed. At the same time, since the water spray nozzle extends outward tangentially, the sprayed water will simultaneously drive the drive water pipe 4 to rotate.

[0033] The flushing structure also includes a sliding water pipe 7 slidably disposed on the wall of the demister body 1. One end of the sliding water pipe 7 extends out of the wall of the demister body 1, and the other end of the sliding water pipe 7 is located inside the demister body 1. The sliding water pipe 7 is located above the drive water pipe 4, and several evenly distributed nozzles 8 are arranged below the sliding water pipe 7. The top of each stop disc 5 is sandwiched between two adjacent nozzles 8. With the above arrangement, the stop disc 5 will rotate in a figure-eight shape under the rotation of the drive water pipe 4. At the same time, since the top of the stop disc 5 is sandwiched between two adjacent nozzles 8, when the stop disc... When the device 5 is shaken, it will cause the two adjacent nozzles 8 to move repeatedly to the left and right sides, similar to a straight saw cutting. At the same time, the sliding water pipe 7 can also spray water. The water entering from the sliding water pipe 7 will be sprayed out from the nozzle 8 and spray onto the baffle disc 5. Due to the obstruction of the baffle disc 5, the water sprayed from the nozzle 8 will be affected by the Coanda effect to form a water curtain to block the flue gas. At the same time, it can also prevent the baffle disc 5 from being affected by the flue gas and scale. The movement trajectory of the baffle disc 5 can also effectively obstruct the rising flue gas without hindering the normal passage of the flue gas.

[0034] A support rod 9 is installed at the top of the sliding water pipe 7. A connecting rod 10 is installed at the top of the support rod 9 via a universal joint. A rotating ring 11 is connected to the end of the connecting rod 10. A second bearing 12 is connected to the center of the rotating ring 11 via a connecting rod. An L-shaped mounting wall 13 is rotatably installed on the second bearing 12. The other end of the L-shaped mounting wall 13 is fixed to the wall of the demister body 1. A striking hammer 14 is installed on the side wall of the rotating ring 11. The striking hammer 14 rotates through the rotating ring 11 and strikes the surface of the corrugated plate 2. When two adjacent nozzles 8 repeatedly move to the left and right, the sliding water pipe 7 moves synchronously to the left and right, thereby driving the connecting rod 10 to move. Since the rotating ring 11 is fixed by the L-shaped mounting wall 13... When the connecting rod 10 is fixed, the rotating ring 11 will rotate along the second bearing 12 at a certain angle and rotate back and forth continuously. At this time, the hammer 14 will also rotate back and forth continuously and strike the corrugated plate 2. By continuously striking, the droplets condensed on the surface of the corrugated plate 2 can be separated. Compared with the droplets that fall naturally, the process of falling is accelerated by rapping, which can reduce the droplets that are in the demister body 1 for a long time, reduce the probability of the flue gas re-attaching harmful substances, and at the same time reduce the droplets on the surface of the corrugated plate 2, so that the next round of droplet adsorption can be carried out quickly. The contact time is reduced and the surface of the corrugated plate 2 can also be prevented from caking.

[0035] There are two support plates 3, which are respectively horizontally arranged at the upper and lower ends of the demister body 1. Several ear plates 15 are arranged on the top of the support plate 3. The end of the corrugated plate 2 is arranged between two adjacent ear plates 15, and the corrugated plate 2 is slidably installed with the support plate 3. The gap between the two adjacent ear plates 15 can leave a certain space for the corrugated plate 2 to oscillate.

[0036] The number of stop discs 5 is at least the same as the number of gaps formed by adjacent nozzles 8.

[0037] A flushing method for a demister, wherein the water spray pattern of the nozzle is a diffused spray.

[0038] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A flushing device for a desulfurization absorption tower demister in a thermal power plant, comprising a demister body (1), wherein the demister body (1) comprises at least one set of demister components, each set of demister components comprising a plurality of corrugated plates (2) arranged at equal intervals inside the demister body (1) and a support plate (3) for fixing the corrugated plates (2), characterized in that: The demister body (1) is also provided with a flushing structure that acts on the corrugated plate (2); the flushing structure is distributed in the gap between two adjacent corrugated plates (2); the flushing structure includes a drive water pipe (4) rotatably set on the wall of the demister body (1), the outer arc surface of the drive water pipe (4) is inclinedly installed with several stop discs (5), one end of the drive water pipe (4) extends out of the wall of the demister body (1), the other end of the drive water pipe (4) is located inside the demister body (1) and the end is sealed, the drive water pipe (4) is provided with several water spray nozzles on the inner wall surface of the demister body (1), the water spray nozzles are distributed around the circumference of the drive water pipe (4), and the water spray nozzles extend outward tangentially.

2. The flushing device for the demister of a desulfurization absorption tower in a thermal power plant as described in claim 1, characterized in that: The flushing structure also includes a sliding water pipe (7) that is slidably disposed on the wall of the demister body (1). One end of the sliding water pipe (7) extends out of the wall of the demister body (1), and the other end of the sliding water pipe (7) is located inside the demister body (1). The sliding water pipe (7) is located above the drive water pipe (4), and several evenly distributed nozzles (8) are disposed below the sliding water pipe (7). The top of each stop disc (5) is sandwiched between two adjacent nozzles (8).

3. The flushing device for the demister of a desulfurization absorption tower in a thermal power plant as described in claim 2, characterized in that: The top of the sliding water pipe (7) is provided with a support rod (9), and the top of the support rod (9) is provided with a connecting rod (10) via a universal joint (6). The end of the connecting rod (10) is connected to a rotating ring (11). The center of the rotating ring (11) is connected to a second bearing (12) via a connecting rod. An L-shaped mounting wall (13) is rotatably provided on the second bearing (12). The other end of the L-shaped mounting wall (13) is fixed to the wall of the demister body (1). A hammer (14) is provided on the side wall of the rotating ring (11). The hammer (14) rotates through the rotating ring (11) and strikes the surface of the corrugated plate (2).

4. The flushing device for the demister of a desulfurization absorption tower in a thermal power plant as described in claim 3, characterized in that: There are two support plates (3). The two support plates (3) are respectively arranged horizontally at the upper and lower ends inside the demister body (1). Several ear plates (15) are provided on the top of the support plate (3). The end of the corrugated plate (2) is located between two adjacent ear plates (15), and the corrugated plate (2) is slidably installed with the support plate (3).

5. The flushing device for the demister of a desulfurization absorption tower in a thermal power plant as described in claim 1, characterized in that: The drive water pipe (4) has a threaded groove (16) on the inner wall of the demister body (1).

6. The flushing device for the demister of a desulfurization absorption tower in a thermal power plant as described in claim 5, characterized in that: The water nozzles are evenly distributed within the threaded groove (16).

7. The flushing device for the demister of a desulfurization absorption tower in a thermal power plant as described in claim 6, characterized in that: The two ends of the water nozzle are squeezed inward to form a Venturi channel.

8. The flushing device for the demister of a desulfurization absorption tower in a thermal power plant as described in claim 7, characterized in that: The number of the stop discs (5) is at least the same as the number of gaps formed by adjacent nozzles (8).

9. A flushing method for a demister as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: A high-pressure water source is connected to one end of the drive water pipe (4) that passes through the wall of the demister body (1) to inject a water flow containing mixed scale inhibitor into the drive water pipe (4) under high pressure; after the water flow enters the drive water pipe (4), it flows in a swirling manner towards the spray nozzle along the spiral groove (16). S2: After the water flow is accelerated through the Venturi channel, it is sprayed out at high speed from the nozzle along the tangential direction. The nozzle adopts a scattering spray method, and the sprayed water flow simultaneously drives the drive water pipe (4) to rotate. S3: The drive water pipe (4) rotates, causing several baffle discs (5) installed on its outer arc surface to rotate in a figure-eight shape. The rotating baffle discs (5) block the rising flue gas at the bottom. S4: The top of the baffle disc (5) is sandwiched between two adjacent nozzles (8) below the sliding water pipe (7). The figure-eight rotation of the baffle disc (5) causes the sliding water pipe (7) to move repeatedly to the left and right ends. The water entering from the sliding water pipe (7) is sprayed out from the nozzle (8) and sprayed onto the baffle disc (5). Under the Coanda effect, a diffuse water curtain is formed to obstruct the rising flue gas. S5: When the sliding water pipe (7) moves repeatedly to the left and right ends, the rotating ring (11) is driven to rotate along the second bearing (12) at a certain angle and rotate back and forth continuously through the support rod (9), universal shaft (6) and connecting rod (10), so that the hammer (14) rotates back and forth continuously and strikes the surface of the wave plate (2), so that the droplets condensed on the surface of the wave plate (2) are separated.

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