A demisting device and a desulfurization tower

Abstract

This invention discloses a demisting device, including a base plate with mounting holes. A demisting component is installed at the mounting holes. The demisting component includes a demisting seat installed at the mounting holes. The demisting seat has a cylindrical airflow channel arranged from top to bottom, with an upper opening and a lower opening. The upper opening is covered with a grid, and the lower opening has a funnel-shaped cover with a grid at its narrow end. The grid includes an annular grid seat with upper and lower grid blades installed on it. The length directions of the upper and lower grid blades are parallel to each other, with the width direction of the upper grid blades inclined downwards in one direction, and the width direction of the lower grid blades inclined downwards in the opposite direction. This invention improves demisting efficiency. This invention also discloses a desulfurization tower.

Description

Technical Field

[0001] This invention relates to a demisting device, and more particularly to a demisting device for a desulfurization tower.

[0002] This invention relates to a desulfurization tower, and more particularly to a desulfurization tower equipped with a demisting device. Background Technology

[0003] During the operation of the desulfurization tower, flue gas containing a large amount of combustion particulate matter and pollutants such as SO2 flows into the desulfurization tower through the inlet. The flue gas flows upward through the rectifier and spray layer, and reacts fully with the limestone slurry sprayed down from the top of the desulfurization tower to achieve the purpose of desulfurization. Then, through devices such as demister and spray cooling water, particulate matter in the flue gas is further removed, the humidity of the flue gas is reduced, and the white fog phenomenon during flue gas emission is reduced. After the concentration of pollutants in the flue gas reaches the emission standard, it flows out from the outlet of the desulfurization tower and enters the chimney to be discharged into the atmosphere.

[0004] Existing desulfurization towers consist of a tower body comprising a flue gas inlet, limestone slurry, desulfurization device, slurry spraying, demister, spray cooling water, flue gas outlet, and water pump. A demister is installed inside the tower near the flue gas outlet. However, existing demisters typically use a grid or mesh structure, which not only has poor demisting effect but also easily leads to liquid accumulation at the demister, thus affecting the normal operation of the desulfurization tower. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a defogging device with better defogging effect.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a defogging device, including a base plate, characterized in that: the base plate is horizontally arranged, the base plate is provided with a mounting hole, a defogging component is installed at the mounting hole, the defogging component includes a defogging seat installed at the mounting hole, the defogging seat is provided with a straight cylindrical airflow channel arranged from top to bottom, the airflow channel includes an upper opening and a lower opening, the upper opening is covered with a grid, the lower opening is installed with a funnel-shaped funnel cover, the large end of the funnel cover matches and is sealed to the periphery of the lower opening, and the small end of the funnel cover is covered with a grid;

[0007] The grid includes an annular grid base on which two layers of grid blades are installed. The length directions of the upper and lower grid blades are parallel to each other. The width direction of the upper grid blades is inclined downward in one direction, while the width direction of the lower grid blades is inclined downward in the opposite direction.

[0008] The beneficial effects of this invention are as follows: In the desulfurization tower, the sprayed cooling water falls onto the demister, a portion of which accumulates on the bottom plate and flows sequentially toward the grid, forming a cooling water film on the grid. The grid adopts two layers of grid blades, and the slope arrangement of the two layers of grid blades is set along the direction of the liquid film flow. This structure has the following advantages: (1) The double-layer grid has a large opening ratio (large opening space), is not easily blocked, and allows flue gas to pass through at high speed, thus resulting in a smaller pressure drop; (2) The sprayed cooling water forms a stable liquid film on the two layers of grid blades, which increases the contact area between the sprayed cooling water and the flue gas, thereby improving the demister efficiency.

[0009] A further configuration is provided: there is a gap between the upper and lower grid blades, and the upper and lower grid blades are arranged in a staggered manner in the vertical direction. This gap design allows for a larger opening space between the grids while minimizing the risk of blockage.

[0010] A further configuration is made such that when the upper and lower grid blades are tilted downwards, the angle between them and the horizontal plane is 20° to 75°. This preferred angle improves liquid flow and increases the rate of liquid film formation.

[0011] A further feature is provided: the inner wall of the funnel cover is provided with guide vanes spirally arranged downwards along the inner wall. A portion of the flue gas enters the funnel cover through the grid. Inside the funnel cover, the spirally arranged guide vanes cause the flue gas to swirl and rise, allowing the flue gas to make more thorough contact with the wall surface and the cooling water film. Finally, the flue gas flows out through the grid at the opening of the airflow channel, improving the demisting efficiency.

[0012] A further configuration is provided: a funnel-shaped guide hood is installed at the lower opening of the airflow channel. This guide hood is installed on the outside of the funnel-shaped hood, with its smaller end matching and sealingly connected to the periphery of the lower opening, and its larger end facing downwards. When some flue gas encounters the guide hood, water vapor in the flue gas condenses, and unremoved particles collide with the inner wall of the guide hood, achieving particle removal. Simultaneously, it increases the contact area between the cold wall surface and the high-temperature flue gas, achieving demisting.

[0013] A further configuration includes: a guide plate extending from the large opening end to the small opening end of the guide hood is provided on the inner wall of the guide hood. This guide plate is elongated and obliquely upward along the circumference of the guide hood. During the upward flow of the flue gas, after passing through the desulfurization device and spraying slurry, some of the flue gas encounters the guide plate, causing water vapor in the flue gas to condense. At the same time, any remaining particulate matter impacts the guide plate, achieving the purpose of removing particulate matter. Simultaneously, it increases the contact area between the cold wall surface and the high-temperature flue gas, achieving the purpose of demisting.

[0014] A further feature is provided: the surface of the funnel cover is provided with several auxiliary through holes, and auxiliary grids are provided at these auxiliary through holes. This increases the flow rate of flue gas, and at the same time, the grids improve the removal of particulate matter from the flue gas.

[0015] The auxiliary grille is further configured as follows: It includes an annular auxiliary grille base on which upper and lower auxiliary grille blades are mounted. The length directions of the upper and lower auxiliary grille blades are parallel to each other. The width direction of the upper auxiliary grille blades is inclined downwards in one direction, while the width direction of the lower auxiliary grille blades is inclined downwards in the opposite direction. There is a gap between the upper and lower auxiliary grille blades, and the upper and lower auxiliary grille blades are arranged in a staggered pattern. The double-layer grille has a large opening ratio (large opening space), is less prone to clogging, and allows flue gas to pass through at high speed, resulting in a smaller pressure drop. The sprayed cooling water forms a stable liquid film on the two layers of grille blades. This liquid film increases the contact area between the sprayed cooling water and the flue gas, improving the demisting efficiency.

[0016] The upper and lower auxiliary grid blades are further configured such that when tilted downwards, the angle between them and the horizontal plane is 20° to 75°.

[0017] To overcome the shortcomings of existing technologies, this invention provides a desulfurization tower with better demisting effect inside the tower.

[0018] The technical solution adopted by the present invention to solve its technical problem is: a desulfurization tower, including a desulfurization tower body and a demisting device installed in the desulfurization tower, wherein the demisting device adopts the aforementioned demisting device.

[0019] The beneficial effects of this invention are as follows: In the desulfurization tower, the sprayed cooling water falls onto the demister, a portion of which accumulates on the bottom plate and flows sequentially toward the grid, forming a cooling water film on the grid. The grid adopts two layers of grid blades, and the slope arrangement of the two layers of grid blades is set along the direction of the liquid film flow. This structure has the following advantages: (1) The double-layer grid has a large opening ratio (large opening space), is not easily blocked, and allows flue gas to pass through at high speed, thus resulting in a smaller pressure drop; (2) The sprayed cooling water forms a stable liquid film on the two layers of grid blades, which increases the contact area between the sprayed cooling water and the flue gas, thereby improving the demister efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the defogging component in Embodiment 1 of the present invention.

[0021] Figure 2 This is a structural schematic diagram of the defogging component in Embodiment 1 of the present invention from another perspective, with part of the grille 2c omitted.

[0022] Figure 3This is a structural schematic diagram of the defogging component in Embodiment 1 of the present invention from another perspective, with part of the grille 2c omitted.

[0023] Figure 4 This is a structural schematic diagram of the defogging component according to another perspective of Embodiment 1 of the present invention, with the grid 2a and part of the grid 2c omitted.

[0024] Figure 5 This is a cross-sectional view of the defogging component in Embodiment 1 of the present invention, with grilles 2a and 2c omitted.

[0025] Figure 6 This is a schematic diagram of the structure of the grille in Embodiment 1 of the present invention. Detailed Implementation

[0026] The present invention will now be further described with reference to the accompanying drawings:

[0027] Example 1: As Figures 1-5 As shown, this embodiment includes a base plate (the base plate is only used for fixing and supporting inside the desulfurization tower, so it is omitted from the drawing). When the base plate is set horizontally, it has mounting holes, and a demisting assembly is installed at these mounting holes. The demisting assembly includes a demisting seat 1 installed at the mounting holes. The demisting seat 1 has a cylindrical airflow channel 11 arranged from top to bottom. The airflow channel 11 includes an upper opening 111 and a lower opening 112. The upper opening 111 is covered with a grid 2a, and the lower opening 112 is fitted with a funnel-shaped funnel cover 12. The larger end of the funnel cover 12 matches and seals against the periphery of the lower opening 112, and the smaller end of the funnel cover 12 is covered with a grid 2b. Wherein, as Figure 6 As shown, the grid includes an annular grid seat 21, which is sealed and installed at the mounting hole. Two layers of grid blades are mounted on the grid seat 21. The length directions of the upper grid blade 22 and the lower grid blade 23 are parallel to each other. The width direction of the upper grid blade 22 is inclined downwards in one direction, while the width direction of the lower grid blade 22 is inclined downwards in the opposite direction. A gap of 3mm exists between the upper and lower grid blades 22 and 23. This gap can be adjusted according to the actual size of the desulfurization tower. This gap allows for a large opening space between the grids while preventing clogging. Furthermore, the upper and lower grid blades 22 and 23 are staggered vertically to increase the path and contact area for airflow. When inclined downwards, the upper and lower grid blades 22 and 23 form an angle of 25° with the horizontal plane. This angle can be arbitrarily selected within the range of 20° to 75°. Figure 6 The middle arrow indicates the liquid flow trajectory.

[0028] In this embodiment, a guide vane 13 is provided on the inner wall of the funnel cover 12, spiraling downwards along the inner wall. When a portion of the flue gas enters the funnel cover 12 through the grid 2b, the spirally arranged guide vane 13 causes the flue gas to swirl upwards, allowing for more thorough contact between the flue gas and the wall surface and cooling water film. Finally, the flue gas flows out through the grid 2a at the opening 111 of the airflow channel 11, improving the demisting efficiency. The guide vane 13 here is elongated, or it can be a protruding structure extending along the inner wall of the funnel cover 12. A funnel-shaped guide cover 3 is also installed at the lower opening 112 of the airflow channel 11. This guide cover 3 is installed on the outside of the funnel cover 12, with its smaller end matching and sealingly connected to the periphery of the lower opening 112, and its larger end facing downwards. The inner wall of the guide shroud 3 is provided with a guide plate 31 extending from the large end to the small end of the guide shroud 3. The guide plate 31 is elongated and is obliquely upward along the circumference of the guide shroud 3. When some flue gas encounters the guide shroud 3, water vapor in the flue gas condenses, and at the same time, the unremoved particles collide with the inner wall of the guide shroud 3 and the guide plate 31, which can achieve the purpose of removing particles; at the same time, it also increases the contact area between the cold wall surface and the high temperature flue gas, achieving the purpose of demisting.

[0029] In this embodiment, a plurality of auxiliary through holes 14 are further provided on the surface of the funnel cover 12, and auxiliary grids 2c are also provided at the auxiliary through holes 14. The structure of the auxiliary grids 2c is the same as that of the grids, which can be referred to here. Figure 6 Specifically, the auxiliary grid 2c includes an annular auxiliary grid seat that seals with the auxiliary through hole 14. Two layers of auxiliary grid blades are mounted on the auxiliary grid seat. The length directions of the upper and lower auxiliary grid blades are parallel to each other. The width direction of the upper auxiliary grid blades is inclined downwards in one direction, while the width direction of the lower auxiliary grid blades is inclined downwards in the opposite direction. There is a gap between the upper and lower auxiliary grid blades, and the upper and lower auxiliary grid blades are arranged in an alternating pattern. When inclined downwards, the upper and lower auxiliary grid blades form an angle of 25° with the horizontal plane.

[0030] Example 2: This example is a desulfurization tower, including a desulfurization tower body and a demisting device installed in the desulfurization tower. The demisting device is the demisting device disclosed in Example 1.

Claims

1. A defogging device comprising a base plate, characterized by: The bottom plate is horizontally arranged, and an installation hole is formed in the bottom plate, and a demisting assembly is installed at the installation hole. The grid comprises an annular grid seat, and two layers of grid blades are installed on the grid seat. The upper layer of grid blades and the lower layer of grid blades are staggered in the vertical direction. The inner wall of the funnel cover is provided with a guide vane spirally arranged downward along the inner wall. The funnel cover is installed outside the funnel cover, and the small end of the funnel cover is matched with the circumference of the lower opening and is connected in a sealing manner. The surface of the funnel cover is also provided with a plurality of auxiliary through holes, and the auxiliary through holes are also covered with auxiliary grids.

2. The defogging apparatus according to claim 1, characterized by: The angle between the upper layer of grid blades and the lower layer of grid blades and the horizontal plane is 20-75° when they are inclined downward.

3. The defogging apparatus according to claim 1, characterized by: The inner wall of the funnel cover is provided with a guide plate extending from the large end to the small end of the funnel cover.

4. The defogging apparatus according to claim 1, characterized by: The auxiliary grid comprises an annular auxiliary grid seat, and two layers of auxiliary grid blades are installed on the auxiliary grid seat. The angle between the upper layer of auxiliary grid blades and the lower layer of auxiliary grid blades and the horizontal plane is 20-75° when they are inclined downward.

5. The defogging apparatus according to claim 4, characterized by: The desulfurization tower comprises a desulfurization tower body, and a demisting device is installed in the desulfurization tower.

6. A desulfurizing tower comprising a desulfurizing tower body, characterized by, ​

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