Demisting device of desulfurizing tower

Abstract

The invention discloses a desulfurizing tower demisting device which comprises a desulfurizing tower, the demisting device is installed at the lower end of a smoke outlet of the desulfurizing tower, the demisting device comprises a circular mist catcher and a plurality of spraying devices, the circular mist catcher is coaxially and fixedly sleeved with an annular guide rail, and the spraying devices are evenly distributed in a circumferential array. The spraying devices are installed on the annular guide rail in a sliding mode through sliding blocks at the lower ends of the spraying devices, the ends, close to each other, of the spraying devices are provided with nozzles, and when the circular mist catcher needs to be cleaned, the spraying devices can synchronously conduct circular motion around the axis of the circular mist catcher along the annular guide rail. According to the demisting device of the desulfurizing tower, the plurality of spraying devices do circular motion around the axis of the circular mist catcher, so that the spraying devices can uniformly spray all positions on the circular mist catcher; therefore, the round demister can be cleaned in all directions, and sulfate crystals are prevented from remaining on the round demister.

Description

Technical Field

[0001] The invention relates to the technical field of demisting of a desulfurization absorption tower, in particular to a demisting device for a desulfurization tower. Background Art

[0002] The desulfurization absorption tower is a tower-type equipment used for desulfurization treatment of industrial waste gas. The demister is located at the top of the desulfurization tower. It removes water vapor carrying sulfate crystals in the gas after desulfurization by interception, inertial collision, etc. Therefore, the demister needs to be flushed regularly to ensure the normal use of the demister. The existing mist collector adopts a fixed-point spraying method, so it is impossible to effectively clean all areas of the mist collector, and it is impossible to fully clean the sulfate crystals adhering to the bent demister. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a desulfurization tower demister. By means of a plurality of spraying devices that make circular motions around the axis of the circular mist collector, the spraying devices can evenly spray various positions on the circular mist collector, thereby being able to perform all-round cleaning of the circular demister and avoid sulfate crystals remaining on the circular demister.

[0004] Technical solution: To achieve the above-mentioned purpose, a desulfurization tower demisting device of the present invention comprises a desulfurization tower, a demisting device is installed at the lower end of the smoke outlet of the desulfurization tower, the demisting device comprises a circular mist catcher and a plurality of spraying devices, the outer coaxial fixing sleeve of the circular mist catcher is provided with an annular guide rail, the plurality of spraying devices are evenly distributed in a circular array, and each spraying device is slidably installed on the annular guide rail through a slider at the lower end, and the ends of the plurality of spraying devices close to each other are provided with nozzles, and when the circular mist catcher needs to be cleaned, the plurality of spraying devices can synchronously make circular motion along the annular guide rail around the axis of the circular mist catcher, and the cleaning liquid is evenly sprayed on the circular mist catcher through the plurality of spraying devices.

[0005] Furthermore, it also includes an infusion tube, the upper end of which is connected to a swivel joint, which is fixed at the center of the circular mist collector, and the liquid outlet end of the upper part of the swivel joint is rotatably connected to a shunt pipe coaxially, and the shunt pipe is synchronously connected and communicated with the water inlet ends of several spraying devices through several connecting pipes.

[0006] Furthermore, the spraying device comprises a flat nozzle, and the lower part of the flat nozzle is connected to the sliding block in the annular slide rail through a supporting column.

[0007] Furthermore, the nozzle of the flat nozzle is arranged obliquely downward on the side close to the diverter pipe, and the nozzle is in a straight line. The straight extension line of the straight nozzle intersects with the axis of the diverter pipe at an angle, so that the cleaning liquid sprayed from the nozzle is a fan-shaped jet, and the two contour lines of the edge of the fan-shaped jet are respectively recorded as the inner jet contour line and the outer jet contour line. The lower end of the outer jet contour line intersects with the edge contour of the circular mist collector, and the lower end of the inner jet contour line intersects with the contour of the central area of ​​the circular mist collector.

[0008] Furthermore, an intersection line where the fan-shaped jet intersects the upper surface of the circular mist catcher extends along the radial direction of the circular mist catcher; when the flat nozzle rotates one circle on the annular guide rail with the slider, the area swept by the intersection line coincides with the upper surface of the circular mist catcher.

[0009] Furthermore, an annular mesh plate is coaxially installed at the lower part of the diverter pipe, the mesh holes distributed on the mesh plate can smoothly pass the liquid, the inner jet contour line intersects with the surface where the mesh plate is located, and the outer diameter of the mesh plate is half of the outer diameter of the circular mist collector.

[0010] Furthermore, the water splashes of the fan-shaped jet hitting the mesh plate pass through the mesh holes and fall onto the surface of the circular mist catcher near the central area. When the mesh plate rotates following the diversion pipe, part of the water splashes of the fan-shaped jet hitting the mesh plate directly pass through the mesh holes and fall onto the surface of the circular mist catcher near the central area, and the other part is thrown outward to the edge area of ​​the circular mist catcher under the action of centrifugal force.

[0011] Beneficial effect: A desulfurization tower demisting device of the present invention can make the spraying devices evenly spray various positions on the circular mist collector through a plurality of spraying devices that make circular motion around the axis of the circular mist collector, thereby being able to perform all-round cleaning of the circular mist collector and avoid sulfate crystals remaining on the circular mist collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a simplified diagram of the desulfurization tower structure;

[0013] Figure 2 A top view of a desulfurization tower demisting device of the present invention;

[0014] Figure 3 It is a structural schematic diagram of a demisting device;

[0015] Figure 4 This is a schematic diagram of the structure of the demisting device after adding a screen plate;

[0016] Figure 5 It is a structural schematic diagram of a flat nozzle;

[0017] Figure 6 It is a structural diagram of the mesh plate;

[0018] Figure 7 Schematic diagram of the intersection of the cleaning agent sprayed by the spray device and the upper surface of the circular mist collector. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] As attached Figures 1 to 7 As shown, in the desulfurization tower used in industrial desulfurization, the water vapor with sulfate crystals produced in the reaction chamber will continue to rise until it is discharged from the smoke exhaust port. Although a water bath device is installed above the reaction chamber, some water vapor will still continue to rise upward carrying the sulfate crystals. Therefore, a defogger device needs to be installed below the smoke exhaust port.

[0021] like Figure 1 As shown, a desulfurization tower demisting device according to the present invention comprises a desulfurization tower, and a demisting device is installed at the lower end of the exhaust port of the desulfurization tower, such as Figure 2 As shown, the defogger includes a circular mist catcher 1 and a plurality of spraying devices 3. The circular mist catcher 1 is a columnar structure with a circular outline composed of a plurality of multi-bend folded plates. The outer coaxial fixed sleeve of the circular mist catcher 1 is provided with an annular guide rail 2. The plurality of spraying devices 3 are evenly distributed in a circular array, and each spraying device 3 is slidably mounted on the annular guide rail 2 through a slider 302 at the lower end. The ends of the plurality of spraying devices 3 that are close to each other are provided with nozzles 301. When the circular mist catcher 1 needs to be cleaned, the plurality of spraying devices 3 can synchronously make circular motions along the annular guide rail 2 around the axis of the circular mist catcher 1, and the cleaning liquid is evenly sprayed on the circular mist catcher 1 through the nozzles 301 on the plurality of spraying devices 3.

[0022] like Figure 3 As shown, the demisting device also includes an infusion tube 402, the lower end of the infusion tube 402 is connected to the infusion end of the infusion device, the upper end of the infusion tube 402 is connected to a rotary joint 403, the rotary joint 403 is fixed at the center of the circular mist catcher 1, the liquid outlet end of the upper part of the rotary joint 403 is coaxially rotatably connected to the shunt pipe 4, the shunt pipe 4 is synchronously connected and communicated with the water inlet end of the plurality of spraying devices 3 through a plurality of connecting pipes 6, the shunt pipe 4 evenly divides the liquid cleaning liquid transported by the infusion tube 402 into a plurality of portions, and distributes the liquid cleaning liquid through the plurality of connecting pipes 6. 6 transports each portion of cleaning liquid to each spraying device 3; the rotating joint 403 is connected to the driving device. When the driving device drives the rotating joint 403, the shunt pipe 4 rotates around its own axis at the upper part of the rotating joint 403, and each spraying device 3 rotates synchronously with the shunt pipe 4 through the connecting pipe 6 connected thereto, and makes a circular motion around the circular mist catcher 1 along the annular guide rail 2 around the axis of the circular mist catcher 1; during this process, the circular mist catcher 1 is stationary, and the rotating joint 403 is stationary relative to the circular mist catcher 1.

[0023] like Figure 3As shown, the spraying device 3 includes a flat nozzle 31, the lower part of which is connected to the slider 302 in the annular slide rail 2 through a support column 32, and the water inlet end of each spraying device 3 is the end of the flat nozzle 31 away from the diversion pipe 4.

[0024] In order to reduce the friction between each slider 302 and the annular guide rail 2, a rotating wheel can be rotatably arranged on each slider 302, and each rotating wheel can be arranged tangent to the bottom surface of the annular guide rail 2, so that the driving device can drive the diverter pipe 4 to rotate around its own axis with a smaller output force, and at the same time, each spraying device 3 can be synchronously rotated along the annular guide rail 2 around the axis of the circular mist collector 1.

[0025] like Figure 5 As shown, the nozzle 301 on the spraying device 3 is opened on the end surface of the flat portion of the flat nozzle 31, as shown in FIG. Figure 3 As shown, the nozzle 301 of the flat nozzle 31 is arranged obliquely downward on the side close to the diverter pipe 4, and the nozzle 301 is in a straight line. The straight extension line 34 of the straight nozzle 301 intersects with the axis of the diverter pipe 4 at an angle, and the angle ranges from 30° to 60°, so that the cleaning liquid sprayed from the nozzle 301 is in a fan-shaped jet 35, and the two contour lines of the edge of the fan-shaped jet 25 are respectively recorded as the inner jet contour line 33a and the outer jet contour line 33b, the lower end of the outer jet contour line 33b intersects with the edge contour of the circular mist collector 1, and the lower end of the inner jet contour line 33a intersects with the contour of the central area of ​​the circular mist collector 1.

[0026] like Figure 7 As shown, an intersection line 36 where the fan-shaped jet 35 intersects with the upper surface of the circular mist catcher 1 extends along the radial direction of the circular mist catcher 1; when the flat nozzle 31 rotates one circle on the annular guide rail 2 along with the slider 302, the area swept by the intersection line 36 coincides with the upper surface of the circular mist catcher 1.

[0027] Since the intersection line 36 of the fan-shaped jet 35 of the cleaning agent sprayed by the nozzle 301 of each flat nozzle 31 and the upper surface of the circular mist catcher 1 is a straight line extending in the radial direction of the circular mist catcher 1, during the process of the flat nozzle 31 rotating on the annular guide rail 2 for one circle with the slider 302, the linear velocity of the intersection point on the intersection line 36 that is farther away from the central area of ​​the circular mist catcher 1 is greater. Therefore, during the process of the flat nozzle 31 rotating on the annular guide rail 2 for one circle with the slider 302, the amount of cleaning liquid sprayed on the unit area of ​​the circular mist catcher 1 by the nozzle 301 of each flat nozzle 31 at the same time is different. The closer to the center of the circular mist catcher 1, the more cleaning liquid is sprayed per unit area. Conversely, the farther away from the center of the circular mist catcher 1, the less cleaning liquid is sprayed per unit area, thereby causing the degree of cleaning liquid sprayed on the circular mist catcher 1 to be uneven.

[0028] like Figure 4 As shown, in order to solve the above problem, in the second embodiment, an annular mesh plate 5 is coaxially installed at the lower part of the shunt pipe 4, and the mesh plate 5 is located above the rotating joint 403, so that the mesh plate 5 rotates with the shunt pipe 4, as shown in FIG. Figure 6 As shown, the mesh holes 501 distributed on the mesh plate 5 can smoothly pass the liquid, the inner jet contour line 33a intersects with the surface of the mesh plate 5, and the outer diameter of the mesh plate 5 is half of the outer diameter of the circular mist catcher 1; since the mesh holes 501 on the mesh plate 5 are densely distributed, the water splashes of the fan-shaped jet 35 of the nozzle 301 of the flat nozzle 31 hitting the mesh plate 5 pass through the mesh holes 501 and fall to the surface of the circular mist catcher 1 near the central area. When the mesh plate 5 rotates following the diversion pipe 4, a part of the water splashes of the fan-shaped jet 35 hitting the mesh plate 5 directly pass through the mesh holes 501 and fall to the surface of the circular mist catcher 1 near the central area, and the other part is thrown outward to the edge area of ​​the circular mist catcher 1 under the action of centrifugal force. The water splashes passing through the mesh holes 501 are far more than the water splashes thrown to the edge area of ​​the circular mist catcher 1. Therefore, under the action of the mesh plate 5, the amount of cleaning liquid sprayed per unit area on the circular mist catcher 1 is the same.

[0029] Before installing the desulfurization tower demisting device described in the present invention, installation and debugging are required. During the debugging process, two non-interfering containers are respectively set in the central area of ​​the circular mist collector 1 and the edge area of ​​the circular mist collector. The infusion device conveys the cleaning liquid to the shunt pipe 4 through the infusion pipe 402 at a fixed flow rate. The shunt pipe 4 evenly divides the cleaning liquid into several portions, and conveys each portion of the cleaning liquid to each spraying device 3 through several connecting pipes 6, so that the flow rate of the cleaning liquid sprayed from the nozzle 301 of each spraying device 3 is equal. The cleaning liquid is evenly sprayed onto the circular mist collector 1 through the nozzles 301 of several spraying devices 3. The flat nozzles are adjusted. The angle between the support column 31 and the support column 32 is such that the bottom contour line of the fan-shaped jet 35 of the detergent sprayed from the nozzle 301 of each flat nozzle 31 intersects with the upper surface of the circular mist catcher 1 and the upper surface of the mesh plate 5 respectively, the inner contour line 33a of the fan-shaped jet 35 intersects with the plane where the mesh plate 5 is located, and the outer contour line 33b of the fan-shaped jet 35 intersects with the edge line of the circular mist catcher 1. Then, the driving device is started. While the driving device drives the shunt pipe 4 and the mesh plate 5 to rotate around the axis of the rotating joint 403 at the upper part of the rotating joint 403, each cleaning device 2 rotates synchronously with the shunt pipe through the connecting pipe 6, and makes a circular motion around the axis of the circular mist catcher 1 along the annular track 2. After a predetermined time t, the total flow rate of the cleaning liquid sprayed to the central area and the edge area per unit area of ​​the circular mist catcher 1 within the predetermined time t is measured, that is, the volumes of the cleaning liquid falling into the two non-interfering containers respectively arranged in the central area and the edge area of ​​the circular mist catcher 1 are compared. If the total flow rate of the cleaning liquid sprayed to the central area per unit area of ​​the circular mist catcher 1 within the predetermined time is greater than the total flow rate of the cleaning liquid sprayed to the edge area per unit area of ​​the circular mist catcher 1 within the predetermined time, it is necessary to increase the power of the driving device to increase the rotation speed of the shunt pipe 4, thereby increasing the centrifugal force on the mesh plate 5, so that more cleaning liquid It is thrown to the edge area of ​​the circular mist collector 1. If the total flow rate of cleaning liquid sprayed on the central area per unit area of ​​the circular mist collector 1 within the predetermined time is less than the total flow rate of cleaning liquid sprayed on the edge area per unit area of ​​the circular mist collector 1 within the predetermined time, it is necessary to reduce the power of the driving device and reduce the centrifugal force on the mesh plate 5 so that less cleaning liquid is thrown to the edge area of ​​the circular mist collector 1, until the total flow rate of cleaning liquid sprayed on the central area per unit area of ​​the circular mist collector 1 within the predetermined time is equal to the total flow rate of cleaning liquid sprayed on the edge area per unit area of ​​the circular mist collector 1 within the predetermined time. The output power of the driving device at this time is recorded as the optimal working power, and the debugging work is completed.

[0030] When the circular mist catcher 1 needs to be cleaned after use, the infusion device is first started, and the infusion device conveys cleaning liquid in the shunt pipe 4 at a fixed flow rate. The shunt pipe 4 evenly divides the cleaning liquid into several portions, and conveys each portion of the cleaning liquid to each spraying device 3 through a plurality of connecting pipes 6, so that the flow rate of the cleaning liquid sprayed from the nozzles 301 of each spraying device 3 is equal, and the cleaning liquid is evenly sprayed onto the circular mist catcher 1 through the nozzles 301 of the plurality of spraying devices 3, and the bottom contour lines of the fan-shaped jets 35 of the cleaning agent sprayed from the nozzles 301 of each flat nozzle 31 intersect with the upper surface of the circular mist catcher 1 and the upper surface of the mesh plate 5 respectively, and then the driving device is started, and the driving device drives the shunt pipe 4 and the mesh plate 5 to rotate around the rotating joint 4 at the upper part of the rotating joint 403. While the axis 03 rotates, each cleaning device 2 rotates synchronously with the diversion pipe through the connecting pipe 6, and makes a circular motion along the annular track 2 around the axis of the circular mist catcher 1. With each rotation, the area swept by the intersection line of the fan-shaped jet 35 of cleaning liquid sprayed from the nozzle 301 of the flat nozzle 31 of each cleaning device 2 and the upper surface of the circular mist catcher 1 is equal to the area of ​​the upper surface of the circular mist catcher 1. During the rotation process, the mesh plate 5 uses centrifugal force to throw the cleaning liquid sprayed on the area of ​​the mesh plate 5 where the mesh holes 501 are not opened to the edge area of ​​the circular mist catcher 1, so that the cleaning liquid sprayed on the circular mist catcher 1 by several spraying devices 3, at the same time, the cleaning liquid flow rate sprayed on the central area of ​​the circular mist catcher 1 is equal to the cleaning liquid flow rate on the edge area of ​​the circular mist catcher 1.

[0031] In order to more thoroughly clean the sulfate crystals crystallized on the circular mist collector 1 , the cleaning liquid selected in this solution is a weak alkaline solution for the sulfate crystals to react, so that the sulfate crystals can be dissolved faster, thereby completely cleaning the circular mist collector 1 .

[0032] The above are preferred embodiments of the present invention. It should be pointed out that a person skilled in the art may make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A desulfurization tower demisting device, Features: The invention comprises a desulfurization tower, wherein a demisting device is installed at the lower end of the exhaust port of the desulfurization tower, wherein the demisting device comprises a circular mist collector (1) and a plurality of spraying devices (3), wherein an annular guide rail (2) is provided on the outer coaxial fixed sleeve of the circular mist collector (1), wherein the plurality of spraying devices (3) are evenly distributed in a circular array, and each of the spraying devices (3) is slidably installed on the annular guide rail (2) through a slider (302) at the lower end, and each of the plurality of spraying devices (3) has a nozzle (301) at one end close to each other, and when the circular mist collector (1) needs to be cleaned, the plurality of spraying devices (3) can synchronously move in a circle along the annular guide rail (2) around the axis of the circular mist collector (1), and a cleaning liquid is evenly sprayed on the circular mist collector (1) through the plurality of spraying devices (3).

2. A desulfurization tower demisting device according to claim 1, Features: It also includes an infusion tube (402), the upper end of which is connected to a rotating joint (403), the rotating joint (403) being fixed at the center of the circular mist collector (1), the liquid outlet end of the upper part of the rotating joint (403) being coaxially rotatably connected to a shunt tube (4), the shunt tube (4) being synchronously connected and communicated with the water inlet ends of a plurality of spraying devices (3) through a plurality of connecting tubes (6).

3. A desulfurization tower demisting device according to claim 1, Features: The spraying device (3) comprises a flat nozzle (31), the lower part of which is connected to a sliding block (302) in the annular slide rail (2) via a supporting column (32).

4. A desulfurization tower demisting device according to claim 1, Features: The nozzle (302) of the flat nozzle (31) is arranged obliquely downward on a side close to the diverter pipe (4), and the nozzle (302) is in a straight line shape. The straight extension line (34) of the straight nozzle (302) intersects with the axis of the diverter pipe (4) at an angle, so that the cleaning liquid sprayed from the nozzle (301) is in a fan-shaped jet (35). The two contour lines of the edge of the fan-shaped jet (25) are respectively recorded as an inner jet contour line (33a) and an outer jet contour line (33b). The lower end of the outer jet contour line (33b) intersects with the edge contour of the circular mist catcher (1), and the lower end of the inner jet contour line (33a) intersects with the contour of the central area of ​​the circular mist catcher (1).

5. A desulfurization tower demisting device according to claim 4, Features: An intersection line (36) where the fan-shaped jet (35) intersects with the upper surface of the circular mist catcher (1) extends in the radial direction of the circular mist catcher (1); when the flat nozzle (31) rotates one circle on the annular guide rail (2) along with the slider (302), the area swept by the intersection line (36) coincides with the upper surface of the circular mist catcher (1).

6. A desulfurization tower demisting device according to claim 2, Features: An annular mesh plate (5) is coaxially mounted at the lower part of the diverter pipe (4); the mesh holes (501) distributed on the mesh plate (5) can smoothly pass the liquid; the inner jet contour line (33a) intersects with the surface of the mesh plate (5); and the outer diameter of the mesh plate (5) is half the outer diameter of the circular mist collector (1).

7. A desulfurization tower demisting device according to claim 2, Features: The water splashes caused by the fan-shaped jet (35) hitting the mesh plate (5) pass through the mesh holes (501) and fall onto the surface of the circular mist catcher (1) near the central area. When the mesh plate (5) rotates along with the diverter pipe (4), part of the water splashes caused by the fan-shaped jet (35) hitting the mesh plate (5) directly pass through the mesh holes (501) and fall onto the surface of the circular mist catcher (1) near the central area, while the other part is thrown outwards to the edge area of ​​the circular mist catcher (1) under the action of centrifugal force.

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