Filtering structure for wet desulphurization process

Abstract

According to the filtering structure for the wet desulfurization process, the fixed flange is arranged on the inner wall of the desulfurization tower, the fixed flange encloses the opening of the pump suction inlet pipeline in the desulfurization tower, the filtering device covers the fixed flange, and the backwashing device corresponding to the filtering device is arranged on the pump suction inlet pipeline. According to the present invention, the operation of the desulfurization tower can be temporarily stopped and the absorbent in the desulfurization tower can be emptied according to the requirement, and the backwashing device can be opened to perform backwashing on the filtration device so as to flush away the particulate matters deposited on the filtration device, such that the filtration device can be prevented from scaling.

Description

Technical Field

[0001] This utility model relates to the field of wet desulfurization technology, specifically to a filter structure for wet desulfurization processes. Background Technology

[0002] During the construction of desulfurization systems, due to negligence or carelessness by construction workers, tools, gloves, and other debris may be left in the flue. When the system is running, these debris can be blown into the desulfurization tower by the fan and enter the circulating slurry. Additionally, after the system is put into operation, there is a risk of the anti-corrosion layer peeling off or some components loosening and falling into the circulating slurry. During system operation, all of these debris may be drawn into the pump chamber with the circulating slurry, causing impeller damage, equipment failure, and system shutdown. Smaller debris or particles may also enter the spray pipes with the circulating slurry, causing pipe or nozzle blockages. Repairs will be extremely difficult, requiring not only system shutdown but also extensive work to locate the blockage. Furthermore, the involvement of working at heights introduces additional risks during maintenance.

[0003] To address this issue, some industry players use basket filters or Y-type filters installed in the inlet pipe of the circulating pump to filter impurities, while others use filter screens installed inside the pump suction inlet on the equipment wall to achieve both filtration and interception. Using basket filters or Y-type filters in the circulating pump inlet pipe: Because the absorbent used in wet desulfurization systems is a mixture of calcium carbonate or calcium oxide, it inherently contains a large amount of particulate matter. During system operation, this easily causes filter screen clogging. Over time, hardened scale builds up, completely blocking many of the screen's pores. Removing this hardened scale is difficult, significantly increasing maintenance workload. Utility Model Content

[0004] The present invention provides a filter structure for wet desulfurization processes, which improves upon the problem that existing filter structures are prone to accumulating hard dirt, leading to difficulties in maintenance, and can avoid the formation of hard dirt.

[0005] To achieve the above objectives, this utility model provides a filter structure for a wet desulfurization process, comprising a pump inlet pipe located between the desulfurization tower and the circulating pump, and including:

[0006] A fixed flange is provided on the inner wall of the desulfurization tower and surrounds the opening of the pump inlet pipe inside the desulfurization tower;

[0007] A filter device, the filter device covering the fixed flange;

[0008] A backwashing device, comprising a backwash pipe, is installed at the pump inlet pipe and corresponds to the filter device. A fixed flange is connected to the inner wall of the desulfurization tower. Compared to the filter screen being directly welded to the inner wall of the desulfurization tower, the fixed flange can be relatively thicker, resulting in a more secure weld. The backwashing device is externally connected to a tap water pipe, with the water supply cut off during normal operation. If necessary, the desulfurization tower can be temporarily stopped and the absorbent drained, and the backwashing device can be activated to backwash the filter device, thus preventing scaling on the filter device.

[0009] As an optional technical solution, the filtration device includes a first sealing plate and a second sealing plate. The first sealing plate is connected to opposite sides of the fixed flange and protrudes radially into the desulfurization tower. One side of the second sealing plate is connected to the fixed flange facing the top of the desulfurization tower, and the other side is connected to the first sealing plate. Both the first and second sealing plates have multiple filter holes on their surfaces. The protrusion of the first sealing plate increases its surface area facing the interior of the desulfurization tower, allowing for the distribution of more filter holes. This increases the flow area, reduces the pump flow rate and head required to achieve the required circulating liquid flow rate, and ultimately lowers the cost of the wet desulfurization process.

[0010] As an optional technical solution, the side of the second sealing plate connected to the fixed flange is closer to the top of the desulfurization tower than the side connected to the first sealing plate. The inclined arrangement of the second sealing plate helps prevent the accumulation of absorbent in the slurry, thereby preventing the formation of hard scale and clogging of the filter pores.

[0011] As an optional technical solution, the angle between the second sealing plate and the axial direction of the desulfurization tower is 45°-60°.

[0012] As an optional technical solution, the filtration device further includes a third sealing plate, which is connected to the first sealing plate and the fixed flange, and is disposed opposite to the second sealing plate. The first sealing plate, the second sealing plate, and the third sealing plate enclose and cover the opening of the pump suction inlet pipe inside the desulfurization tower. The filtration device completely seals the fixed flange through the first sealing plate, the second sealing plate, and the third sealing plate, thereby preventing foreign objects from entering the pump suction inlet pipe.

[0013] As an optional technical solution, the filter device is detachably connected to the fixed flange.

[0014] As an optional technical solution, the filter device is connected to the fixed flange by bolts.

[0015] As an optional technical solution, the bolts and nuts in the bolted connection are made of 316L stainless steel.

[0016] As an optional technical solution, the filter device is made of a composite material in which a silicon carbide reinforcing phase is incorporated into a glass fiber reinforced resin matrix. Because silicon carbide improves the wear resistance of the filter device in this technical solution, it is not rapidly worn away by solid particles in the absorbent under long-term operating conditions.

[0017] As an optional technical solution, the backwashing device also includes a valve connected to the backwashing pipe.

[0018] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0019] This utility model discloses a filtration structure for wet desulfurization processes. A fixed flange is installed on the inner wall of the desulfurization tower, enclosing the opening of the pump inlet pipe within the tower. A filter device covers the fixed flange, and a backwashing device is installed on the pump inlet pipe corresponding to the filter device. If necessary, the desulfurization tower can be temporarily stopped and the absorbent vented. The backwashing device can then be activated to backwash the filter device, removing deposited particles and preventing scaling. Attached Figure Description

[0020] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0021] Figure 1 This is a side view of the fixed flange in this utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of a fixed flange, where (B) is the front view and (C) is the top view;

[0023] Figure 3 These are three views of the filtering device in this utility model, where (A) is a side view, (B) is a front view, and (C) is a top view.

[0024] Explanation of reference numerals in the attached figures

[0025] Desulfurization tower -100; Pump suction inlet pipe -200;

[0026] Fixed flange-1; Filter device-2; First sealing plate-21; Second sealing plate-22; Third sealing plate-23;

[0027] Backflushing pipe-3; Valve-4;

[0028] Desulfurization tower axial direction -X; desulfurization tower radial direction -Y. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In this invention, the terms "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a direct connection, an indirect connection via an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0033] In addition, unless otherwise stated, "multiple" means two or more. Example

[0034] This embodiment provides a filter structure for a wet desulfurization process. The pump inlet pipe 200, located between the desulfurization tower 100 and the circulating pump, includes a fixed flange 1, a filter device 2, and a backwashing device. The fixed flange 1 is located on the inner wall of the desulfurization tower 100, surrounding the opening of the pump inlet pipe 200 within the desulfurization tower 100. The filter device 2 covers the fixed flange 1. The backwashing device includes a backwash pipe 3, which is located in the pump inlet pipe 200 and corresponds to the filter device 2. The fixed flange 1 is welded to the inner wall of the desulfurization tower 100. Compared to directly welding the filter screen to the inner wall of the desulfurization tower 100, the fixed flange 1 can be relatively thicker, resulting in a more secure weld. The backwashing device is connected to a tap water pipe, and the water supply is cut off during normal operation. If necessary, the operation of the desulfurization tower 100 can be temporarily stopped and the absorbent inside the desulfurization tower 100 can be emptied. The backwashing device can be turned on to backwash the filter device 2, which can prevent scale buildup in the filter device 2. Example

[0035] Based on Embodiment 1, the filter device 2 includes a first sealing plate 21 and a second sealing plate 22. The first sealing plate 21 is connected to opposite sides of the fixed flange 1 and protrudes into the desulfurization tower 100 along the radial Y direction. One side of the second sealing plate 22 is connected to the side of the fixed flange 1 facing the top of the desulfurization tower 100, and the other side is connected to the first sealing plate 21. The surfaces of the first sealing plate 21 and the second sealing plate 22 have multiple filter holes. The protrusion of the first sealing plate 21 increases the surface area of ​​the first sealing plate 21 facing the interior of the desulfurization tower 100, thereby allowing for the distribution of more filter holes. This increases the flow area, reduces the pump flow rate and head required to achieve the required circulating liquid flow rate, and helps reduce the cost of the wet desulfurization process.

[0036] As an alternative implementation, the side of the second sealing plate 22 connected to the fixed flange 1 is closer to the top of the desulfurization tower 100 than the side connected to the first sealing plate 21. The inclined arrangement of the second sealing plate 22 helps to prevent the accumulation of absorbent in the slurry, thereby preventing the formation of hard dirt and clogging of the filter holes.

[0037] As an optional implementation, the angle between the second sealing plate 22 and the axial direction X of the desulfurization tower is 45°-60°.

[0038] As an optional implementation, the filter device 2 further includes a third sealing plate 23, which is connected to the first sealing plate 21 and the fixed flange 1, and is disposed opposite to the second sealing plate 22. The first sealing plate 21, the second sealing plate 22, and the third sealing plate 23 enclose and cover the opening of the pump suction inlet pipe 200 in the desulfurization tower 100. The filter device 2 completely seals the fixed flange 1 through the first sealing plate 21, the second sealing plate 22, and the third sealing plate 23, thereby preventing foreign objects from entering the pump suction inlet pipe 200. The third sealing plate 23 may also be provided with multiple filter holes.

[0039] As an optional implementation, the filter device 2 is detachably connected to the fixed flange 1.

[0040] As an optional implementation, the filter device 2 is connected to the fixed flange 1 by bolts.

[0041] As an optional implementation, the bolts and nuts in the bolted connection are made of 316L stainless steel.

[0042] As an optional implementation, the filter device 2 is made of a composite material in which a silicon carbide reinforcing phase is incorporated into a glass fiber reinforced resin matrix. Because silicon carbide improves the wear resistance of the filter device 2 in this embodiment, it is less likely to be rapidly worn away by solid particles in the absorbent under long-term operating conditions.

[0043] As an optional implementation, the backwashing device also includes a valve 4, which is connected to the backwashing pipe 3.

[0044] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0045] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A filter structure for a wet desulfurization process, comprising a pump suction inlet pipe located between the desulfurization tower and the circulating pump, characterized in that, include: A fixed flange is provided on the inner wall of the desulfurization tower and surrounds the opening of the pump inlet pipe inside the desulfurization tower; A filter device, the filter device covering the fixed flange; A backwashing device, comprising a backwashing pipe disposed at the pump inlet pipe and corresponding to the filter device; The filtration device includes a first sealing plate and a second sealing plate. The first sealing plate is connected to the opposite sides of the fixed flange and protrudes radially into the desulfurization tower. One side of the second sealing plate is connected to the fixed flange facing the top of the desulfurization tower, and the other side is connected to the first sealing plate. The surfaces of the first sealing plate and the second sealing plate have multiple filter holes.

2. The filter structure for wet desulfurization process according to claim 1, characterized in that, The side of the second sealing plate that is connected to the fixed flange is closer to the top of the desulfurization tower than the side that is connected to the first sealing plate.

3. The filter structure for wet desulfurization process according to claim 2, characterized in that, The angle between the second sealing plate and the axial direction of the desulfurization tower is 45°-60°.

4. The filter structure for wet desulfurization process according to claim 1, characterized in that, The filtration device further includes a third sealing plate, which is connected to the first sealing plate and the fixed flange and is disposed opposite to the second sealing plate. The first sealing plate, the second sealing plate and the third sealing plate surround and cover the opening of the pump inlet pipe in the desulfurization tower.

5. A filter structure for wet desulfurization process according to claim 1, characterized in that, The filter device is detachably connected to the fixed flange.

6. A filter structure for wet desulfurization process according to claim 5, characterized in that, The filter device is connected to the fixed flange by bolts.

7. A filter structure for wet desulfurization process according to claim 6, characterized in that, The bolts and nuts in the bolted connection are made of 316L stainless steel.

8. A filter structure for wet desulfurization process according to claim 1, characterized in that, The filter device is made of a composite material in which a silicon carbide reinforcing phase is incorporated into a glass fiber reinforced resin matrix.

9. A filter structure for wet desulfurization process according to claim 1, characterized in that, The backwashing device also includes a valve connected to the backwashing pipe.

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