Flushing device and flushing method for demister of desulfurizing absorption tower of thermal power plant

Abstract

The invention relates to a thermal power plant desulfurizing absorption tower demister flushing device and method, the thermal power plant desulfurizing absorption tower demister flushing device comprises a demister body, the demister body comprises a demisting assembly, and each demisting assembly comprises a plurality of corrugated plates arranged in the demister body at equal intervals and a supporting plate for fixing the corrugated plates; a flushing structure acting on the corrugated plate is also arranged on the demister body; the flushing structures are distributed in gaps between every two adjacent corrugated plates; the flushing structure comprises a driving water pipe rotationally arranged on the wall face of the demister body, a plurality of gear discs are obliquely installed on the outer arc face of the driving water pipe, one port of the driving water pipe penetrates out of the wall face of the demister body, and the other port of the driving water pipe is located in the demister body and sealed. A plurality of water injection nozzles are formed in the inner wall surface, located on the demister body, of the driving water pipe, are distributed around the circumference of the driving water pipe and extend outwards in the tangential direction, so that water flow can be directly sprayed to cover the interior of the whole demister for cleaning, and meanwhile, the scaling speed can be slowed down.

Description

Technical Field

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

[0002] Defoggers are widely used to separate liquid droplets entrained in gas in separation towers and can effectively remove droplets in the gas. Since impurities in the liquid droplets will be adsorbed on the demister blades while the demister separates gas and liquid, it is necessary to add a flushing device to flush away the impurities adsorbed on the demister blades. Existing demisters flush the demister blades by spraying water from the upper or lower end of the demister, but since the demister blades are irregular arc-shaped plates, it is difficult to directly flush the inside of the demister blades using this flushing method, and the flushing effect is not ideal.

[0003] The Chinese utility model patent No. 200920234912.X discloses an anti-clogging demister, including a demister body composed of demister blades and a demister frame, and a flushing device arranged at both ends of the demister blades. The demister blades include an inlet section, a front baffle section, a rear baffle section, and an outlet section. The nozzle outlet direction of the flushing device arranged at the front end of the demister blade inlet section is consistent with the direction of the inlet section. Although the utility model enhances the flushing effect, due to the curved shape of the demister blades, the water flow still cannot be directly sprayed to cover the entire demister blades, and there are large dead corners that are difficult to be flushed. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a demister flushing device and method for a desulfurization absorption tower in a thermal power plant, which can directly spray water to cover the entire interior of the demister for cleaning and can slow down the scaling rate.

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

[0006] A demister flushing device for a desulfurization absorption tower in a thermal power plant comprises a demister body, the demister body comprises at least one group of demister components, each group of demister modules comprises a plurality of 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 comprises a driving water pipe rotatably arranged on the wall of the demister body, a plurality of gear discs are obliquely installed on the outer arc surface of the driving water pipe, one port of the driving water pipe passes through the wall of the demister body, the other port of the driving water pipe is located in the demister body and the port is sealed, the driving water pipe is provided with a plurality of water spraying ports on the inner wall of the demister body, the water spraying ports are distributed around the circumference of the driving water pipe, and the water spraying ports extend outwardly along the tangential direction.

[0007] Among them, the flushing structure also includes a sliding water pipe slidably arranged on the wall of the demister body, one end of the sliding water pipe passes through the wall of the demister body, and the other end of the sliding water pipe is located in the demister body. The sliding water pipe is located above the driving water pipe, and a number of evenly distributed nozzles are arranged below the sliding water pipe, and the top of each gear disc is sandwiched between two adjacent nozzles.

[0008] Among them, the flushing structure also includes a sliding water pipe, the driving water pipe is located on the outer wall surface of the demister body and is rotatably provided with two first bearings, a fixing rod is provided on the top of the first bearing, a sliding sleeve is provided on the top of the fixing rod, both ends of the sliding water pipe are slidably provided in the two sliding sleeves, the sliding water pipe is located above the driving water pipe, and a plurality of evenly distributed nozzles are provided below the sliding water pipe, and the top of each gear disc is sandwiched between two adjacent nozzles.

[0009] Among them, a support rod is arranged on the top of the sliding water pipe, a connecting rod is arranged on the top of the support rod through a universal joint, the end of the connecting rod is connected to a rotating ring, the center of the rotating ring is connected to a second bearing through a connecting rod, an L-shaped mounting wall is rotatably arranged on the second bearing, and the other end of the L-shaped mounting wall is fixed to the wall surface of the defogger body; a knocking hammer is arranged on the side wall of the rotating ring, and the knocking hammer rotates through the rotating ring and knocks on the surface of the corrugated plate.

[0010] There are two support plates, which are laterally arranged at the upper and lower ends of the defogger body respectively. A plurality of ear plates are arranged on the top of the support plate. The end of the corrugated plate is arranged between two adjacent ear plates, and the corrugated plate is slidably installed with the support plate.

[0011] Wherein, the driving water pipe is provided with a threaded groove on the inner wall surface of the demister body.

[0012] Wherein, the water spray ports are evenly distributed in the thread-shaped groove.

[0013] Wherein, the two ends of the water spray port are squeezed inward to form a Venturi channel.

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

[0015] A method for flushing a demister as claimed in any one of claims 1 to 9, wherein the water spraying mode of the water spray outlet is a scattered spray.

[0016] The present invention has the following beneficial effects:

[0017] The invention drives the driving water pipe to rotate by injecting high-pressure water flow, and drives the inclined stop disc on the driving water pipe to rotate in an 8-shaped shape, and the rotating stop disc will block the smoke rising from the bottom;

[0018] At the same time, the shift disc will drive the sliding water pipe on the top to repeatedly move to the left and right ends during its rotation. The nozzle at the bottom of the sliding water pipe will cooperate with the shift disc to form a diffusive water curtain under the Coanda effect. The rising smoke is blocked by the water curtain. After being sprayed in the spray layer at the lower layer, it can be blocked again by the internal part of the demister at the upper layer.

[0019] Again, the sliding water pipe repeatedly moves to the left and right ends and drives the hammer to continuously knock on the corrugated plate through the connecting rod above. The liquid droplets are separated from the surface of the corrugated plate by knocking, which can accelerate the sliding and dripping process and reduce the probability of smoke adhering to harmful substances again. At the same time, it can also 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 shorter contact time can also avoid agglomeration on the surface of the corrugated plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the flushing structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the demister body of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the percussion hammer of the present invention.

[0023] The reference numerals in the figure are as follows:

[0024] 1. demister body; 2. corrugated plate; 3. support plate; 4. driving water pipe; 5. shift disc; 6. universal shaft; 7. sliding water pipe; 8. nozzle; 9. support rod; 10. connecting rod; 11. rotating ring; 12. second bearing; 13. L-shaped mounting wall; 14. knocking hammer; 15. ear plate; 16. threaded groove. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] See also Figures 1 to 3 , the invention provides a technical solution:

[0027] A demister flushing device for a desulfurization absorption tower in a thermal power plant comprises a demister body 1, wherein the demister body 1 comprises at least one group of demister components, each group of demister modules comprises 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, and the demister body 1 is also provided with a flushing structure acting on the corrugated plates 2; the flushing structure is distributed in the gap between two adjacent corrugated plates 2, and a plurality of groups of flushing structures may be provided in the gap between two adjacent corrugated plates 2; the flushing structure comprises a driving water pipe 4 rotatably arranged on the wall surface of the demister body 1, a plurality of gear discs 5 are obliquely installed on the outer arc surface of the driving water pipe 4, one end of the driving water pipe 4 passes through the wall surface of the demister body 1, and the other end of the driving water pipe 4 is located in the demister body 1 and the port is sealed, and the driving water pipe 4 is located inside the demister body 1 A plurality of water spray outlets are provided on the wall surface, and the water spray outlets are distributed around the circumference of the driving water pipe 4, and the water spray outlets extend outward along the tangential direction; when the driving water pipe 4 passes through one end of the wall surface of the demister body 1, rotates the external water pipe and sprays water inward at high pressure, the high-frequency jet mixed with the antiscalant enters the driving water pipe 4 together, and at the same time, as a preferred embodiment, the driving water pipe 4 is located on the inner wall surface of the demister body 1 and is provided with a threaded groove 16, and the water spray outlets are evenly distributed in the threaded groove 16, and the two ends of the water spray outlet are squeezed inward to form a Venturi channel; after the high-frequency jet enters the driving water pipe 4, it flows toward the water spray outlet in a swirling manner along the threaded groove 16 and sprays outward, and in the process of spraying, it is accelerated through the Venturi channel and sprayed out at high speed. At the same time, since the water spray outlet extends outward along the tangential direction, the sprayed water flow will simultaneously drive the driving water pipe 4 to rotate;

[0028] The flushing structure also includes a sliding water pipe 7 slidably arranged on the wall of the demister body 1, one end of the sliding water pipe 7 passes through the wall of the demister body 1, and the other end of the sliding water pipe 7 is located in the demister body 1, the sliding water pipe 7 is located above the driving water pipe 4, and a plurality of evenly distributed nozzles 8 are arranged below the sliding water pipe 7, and the top of each gear disc 5 is sandwiched between two adjacent nozzles 8; through the above arrangement, the gear disc 5 will rotate in an 8-shape under the rotation of the driving water pipe 4, and at the same time, because the top of the gear disc 5 is sandwiched between two adjacent nozzles 8, when the gear disc When the gear 5 is shaken, the two adjacent nozzles 8 will be driven to move repeatedly toward the left and right sides, which is similar to cutting with a straight saw; at the same time, the sliding water pipe 7 can also spray water, and the water entering from the sliding water pipe 7 will be sprayed from the nozzle 8 and flushed onto the gear disc 5. Due to the blocking of the gear disc 5, the water sprayed from the nozzle 8 will be affected by the Coanda effect to form a water curtain to block the smoke, and at the same time, it can also prevent the gear disc 5 from being affected by the smoke and scaling; and the movement trajectory of the gear disc 5 can also effectively block the rising smoke without hindering the normal passage of the smoke;

[0029] A support rod 9 is provided on the top of the sliding water pipe 7, and a connecting rod 10 is provided on the top of the support rod 9 through a universal shaft. The end of the connecting rod 10 is connected to a rotating ring 11, and the center of the rotating ring 11 is connected to a second bearing 12 through a connecting rod. An L-shaped mounting wall 13 is rotatably provided on the second bearing 12, and the other end of the L-shaped mounting wall 13 is fixed to the wall surface of the demister body 1; a knocking hammer 14 is provided on the side wall of the rotating ring 11, and the knocking hammer 14 rotates through the rotating ring 11 and knocks on the surface of the corrugated plate 2; when the two adjacent nozzles 8 repeatedly move toward the left and right sides, the sliding water pipe 7 moves left and right synchronously, thereby driving the connecting rod 10 to move, and since the rotating ring 11 is fixed through the L-shaped mounting wall 13 The connecting rod 10 will drive the rotating ring 11 to rotate a certain angle along the second bearing 12 and rotate back and forth continuously. At this time, the knocking hammer 14 will also rotate back and forth continuously and knock the corrugated plate 2. The droplets condensed on the surface of the corrugated plate 2 can be separated by continuous knocking. Compared with the droplets that slide down and drip naturally, the process of sliding down and dripping can be accelerated by vibration, which can reduce the droplets that stay in the demister body 1 for a long time, and reduce the probability of the flue gas adhering to harmful substances again. At the same time, it can also reduce the droplets on the surface of the corrugated plate 2, and can quickly carry out the next round of adsorption of droplets. The contact time is shortened and the surface of the corrugated plate 2 can also be prevented from agglomerating.

[0030] Two support plates 3 are provided, and the two support plates 3 are transversely arranged at the upper and lower ends of the demister body 1, respectively. A plurality of ear plates 15 are arranged on the top of the support plate 3, and the end of the corrugated plate 2 is arranged between two adjacent ear plates 15, and the corrugated plate 2 and the support plate 3 are slidably installed; the gap between the two adjacent ear plates 15 can leave a certain space for the corrugated plate 2 to oscillate;

[0031] The number of the shift disks 5 is at least the same as the number of the gaps formed by adjacent nozzles 8 .

[0032] A method for flushing a demister, wherein the water spraying mode of a water spraying port is a scattered spraying mode.

[0033] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A demister flushing device for a desulfurization absorption tower in a thermal power plant, comprising a demister body (1), the demister body (1) comprising at least one group of demister components, each group of the demister modules 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 acting on the corrugated plate (2); the flushing structure is distributed in the gap between two adjacent corrugated plates (2); the flushing structure comprises a driving water pipe (4) rotatably arranged on the wall of the demister body (1); a plurality of shift discs (5) are obliquely installed on the outer arc surface of the driving water pipe (4); one end of the driving water pipe (4) passes through the wall of the demister body (1); the other end of the driving water pipe (4) is located in the demister body (1) and the end is sealed; the driving water pipe (4) is provided with a plurality of water spraying ports on the inner wall of the demister body (1); the water spraying ports are distributed around the circumference of the driving water pipe (4), and the water spraying ports extend outward along the tangential direction.

2. A demister flushing device for a desulfurization absorption tower in a thermal power plant according to claim 1, characterized in that: The flushing structure also includes a sliding water pipe (7) slidably arranged on the wall of the demister body (1), one end of the sliding water pipe (7) passes through 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 driving water pipe (4), and a plurality of evenly distributed nozzles (8) are arranged below the sliding water pipe (7), and the top of each gear disc (5) is sandwiched between two adjacent nozzles (8).

3. A demister flushing device for a desulfurization absorption tower in a thermal power plant according to claim 2, characterized in that: A support rod (9) is arranged at the top of the sliding water pipe (7), a connecting rod (10) is arranged at the top of the support rod (9) through a universal shaft (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) through a connecting rod, an L-shaped mounting wall (13) is rotatably arranged on the second bearing (12), and the other end of the L-shaped mounting wall (13) is fixed to the wall surface of the demister body (1); a knocking hammer (14) is arranged on the side wall of the rotating ring (11), and the knocking hammer (14) is rotated through the rotating ring (11) and knocks on the surface of the corrugated plate (2).

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

5. A demister flushing device for a desulfurization absorption tower in a thermal power plant according to claim 1, characterized in that: The driving water pipe (4) is provided with a threaded groove (16) on the inner wall surface of the demister body (1).

6. A demister flushing device for a desulfurization absorption tower in a thermal power plant as claimed in claim 5, characterized in that: The water spray ports are evenly distributed in the thread-shaped groove (16).

7. A demister flushing device for a desulfurization absorption tower in a thermal power plant according to claim 6, characterized in that: The two ends of the water spray port are squeezed inwardly to form a Venturi channel.

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

9. A method for flushing a demister as claimed in any one of claims 1 to 8, characterized in that: The water spraying mode of the water spraying port is a scattered spraying mode.

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