Washing tower tray and washing tower

Abstract

The utility model provides a washing tower tray and washing tower, the washing tower tray comprises a weir plate, an overflow plate and a current collecting plate group, the periphery of the weir plate comprises a matching side and an overflow side, the matching side is used for limiting and matching with the inner wall of a cavity where the washing tower tray is located, and the overflow side is spaced from the inner wall of the cavity where the washing tower tray is located. The area above the weir plate surrounded by the current collection plate group and the inner wall of the cavity where the washing tower tray is located is a current collection area, the weir plate corresponding to the current collection area is provided with a first pollution discharge hole, the overflow plate is arranged on the overflow side and extends in the horizontal direction, and the two ends of the overflow plate extend to the connecting position of the matching side and the overflow side respectively; an area above the weir plate surrounded by the overflow plate, the current collection plate group and the inner wall of the cavity where the washing tower tray is located is an overflow area, a second pollution discharge hole is formed in the bottom of the overflow plate, and the lower edge of the second pollution discharge hole is flush with the bottom wall of the overflow area. According to the technical scheme provided by the utility model, the problem that the tray of the washing tower is easy to block in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gasification, and particularly relates to a tray of a scrubbing tower and the scrubbing tower. Background Art

[0002] In the technical field of coal gasification, the raw syngas coming out of the quench chamber of a gasifier is further washed through technological processes such as a Venturi scrubber and a syngas scrubbing tower, and finally the syngas is washed to a dust content less than 1 mg / m 3 , so as to ensure the stable operation of subsequent conversion or purification conditions. Due to the ash carried by the reaction syngas of the gasifier, a large amount of particulate matter is carried in the water system during the washing process, and sedimentation occurs during long-term operation, resulting in scaling or blockage of pipelines, trays of the scrubbing tower, etc.

[0003] After the tray of the syngas scrubbing tower is blocked, the passing area of the process gas is reduced, resulting in liquid flooding in the syngas scrubbing tower. After the process gas carries water and enters the subsequent system, accidents such as catalyst water ingress and temperature drop in the conversion device may occur. To avoid this accident, only measures such as reducing the operation load of the device can be taken. Reducing the load of the gasification device system will inevitably lead to a decrease in the pressure of the cold methanol washing system, affecting the operation efficiency of the entire device and causing greater economic losses. At the same time, when the tray of the synthesis scrubbing tower is severely blocked and not adjusted in time, the liquid level of the scrubbing tower is too low, resulting in an interlock trip of the gasifier. After the trip, coal is fed into the gasifier again. After the pressure and temperature of the syngas coming out of the gasification system are qualified, the gas can be sent to the subsequent system, and the conversion, purification, and synthesis systems can then receive the gas and start up. The operation intensity and workload of the operators for starting and stopping are relatively large. During this process, a large amount of process gas is vented, affecting the stable production of the subsequent system and causing greater economic losses. Summary of the Utility Model

[0004] The utility model provides a tray of a scrubbing tower and the scrubbing tower to solve the problem that the tray of the existing scrubbing tower is prone to blockage.

[0005] To solve the above problems, according to one aspect of the utility model, the utility model provides a tray of a scrubbing tower. The tray of the scrubbing tower includes a weir plate, an overflow plate and a receiving plate group arranged on the weir plate. The outer periphery of the weir plate includes a mating side and an overflow side. The mating side is used for limiting and mating with the inner wall of the cavity where the tray of the scrubbing tower is located. The overflow side is spaced from the inner wall of the cavity where the tray of the scrubbing tower is located. The receiving plate group extends in the horizontal direction and both ends thereof respectively extend to different positions of the mating side. The area above the weir plate surrounded by the receiving plate group and the inner wall of the cavity where the tray of the scrubbing tower is located is a receiving area. A first sewage discharge hole is provided on the weir plate corresponding to the receiving area. The overflow plate is arranged on the overflow side. The overflow plate extends in the horizontal direction and both ends thereof respectively extend to the connection positions of the mating side and the overflow side. The area above the weir plate surrounded by the overflow plate, the receiving plate group and the inner wall of the cavity where the tray of the scrubbing tower is located is an overflow area. A second sewage discharge hole is provided at the bottom of the overflow plate. The lower edge of the second sewage discharge hole is flush with the bottom wall of the overflow area.

[0006] Further, there are multiple overflow sides, and the multiple overflow sides are spaced along the outer periphery of the weir plate. A mating side is formed between any two overflow sides, and an overflow plate is provided on each overflow side.

[0007] Further, the receiving plate group includes two receiving plates parallel to each other. The overflow plate and the two receiving plates are all vertically arranged above the weir plate. The scrubbing tower tray further includes a downcomer arranged below the weir plate. The downcomer is arranged on the overflow side and is coplanar with the overflow plate.

[0008] Further, the top of the receiving plate group is flush with the top of the overflow plate, or the top of the receiving plate group is located above the top of the overflow plate.

[0009] Further, there are multiple first sewage discharge holes, and the multiple first sewage discharge holes are spaced along the extending direction of the receiving area.

[0010] Further, there are multiple second sewage discharge holes, and the multiple second sewage discharge holes are spaced along the extending direction of the overflow plate.

[0011] Further, the opening height of the second sewage discharge hole is 10 - 30 mm.

[0012] Further, the opening length of the second sewage discharge hole is 50 - 100 mm.

[0013] According to another aspect of the present utility model, a scrubbing tower is provided. The scrubbing tower includes a tower body, a receiving plate arranged in the tower body, and the above-mentioned scrubbing tower tray. The mating side is in limit fit with the inner wall of the tower body. The receiving plate is arranged below the scrubbing tower tray. There is a void area between the projection of the scrubbing tower tray on the radial plane of the tower body and the outer periphery of the tower body. The projection of the receiving plate on the radial plane of the tower body at least covers the void area.

[0014] Further, the receiving plate includes a horizontal plate section and a vertical plate section. The horizontal plate section is connected to the inner wall of the tower body. The vertical plate section is parallel to the downcomer of the scrubbing tower tray and is located inside the downcomer. The horizontal plate section is located below the downcomer, and the top of the vertical plate section is higher than the bottom of the downcomer.

[0015] Applying the technical solution of the present utility model, a tray for a scrubbing tower is provided. The tray for the scrubbing tower includes a weir plate, an overflow plate and a liquid receiving plate group arranged on the weir plate. The outer periphery of the weir plate includes a fitting side and an overflow side. The fitting side is used for limiting cooperation with the inner wall of the cavity where the tray for the scrubbing tower is located, and the overflow side is spaced from the inner wall of the cavity where the tray for the scrubbing tower is located. The liquid receiving plate group extends in the horizontal direction and both ends thereof respectively extend to different positions of the fitting side. The area above the weir plate surrounded by the liquid receiving plate group and the inner wall of the cavity where the tray for the scrubbing tower is located is a liquid receiving area. A first sewage discharge hole is provided on the weir plate corresponding to the liquid receiving area. The overflow plate is arranged on the overflow side and extends in the horizontal direction, and both ends thereof respectively extend to the connection positions of the fitting side and the overflow side. The area above the weir plate surrounded by the overflow plate, the liquid receiving plate group and the inner wall of the cavity where the tray for the scrubbing tower is located is an overflow area. A second sewage discharge hole is provided at the bottom of the overflow plate, and the lower edge of the second sewage discharge hole is flush with the bottom wall of the overflow area.

[0016] Adopting this solution, by providing the first sewage discharge hole and the second sewage discharge hole on the tray for the scrubbing tower, solid particles and the like can be discharged from the tray for the scrubbing tower through the first sewage discharge hole and the second sewage discharge hole, avoiding the accumulation of solid particles and the like at the bottom of the tray for the scrubbing tower, thereby preventing the scaling and blockage of the tray for the scrubbing tower. This is beneficial to improving the gas-liquid contact, washing effect, and the purity of the products in the rectification (distillation) tower on the tray for the scrubbing tower. At the same time, it can also effectively extend the operation cycle of the gasifier and further extend the operation cycles of the downstream conversion, purification, and synthesis systems. On the other hand, this anti-blocking design can be directly processed on the original tray for the scrubbing tower without spending much processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0018] Figure 1 FIG. 1 shows a schematic structural diagram of the tray for the scrubbing tower provided by the embodiment of the present utility model during application;

[0019] Figure 2 FIG. 2 shows Figure 1 a top view of the tray for the scrubbing tower in FIG. 1;

[0020] Figure 3 FIG. 3 shows Figure 1 a side view of the tray for the scrubbing tower in FIG. 1.

[0021] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0022] 10, tray for the scrubbing tower; 101, liquid receiving area; 102, overflow area; 103, first sewage discharge hole; 104, second sewage discharge hole; 11, weir plate; 12, overflow plate; 13, liquid receiving plate; 14, downcomer plate;

[0023] 20. Tower body; 201. Void area;

[0024] 30. Support plate; 31. Horizontal plate section; 32. Vertical plate section. Detailed implementation manner

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] As Figures 1 to 3 shown, the embodiment of the present invention provides a scrubbing tower tray 10. The scrubbing tower tray 10 includes a weir plate 11, an overflow plate 12 and a receiving plate group provided on the weir plate 11. The outer periphery of the weir plate 11 includes a mating side and an overflow side. The mating side is used for limiting cooperation with the inner wall of the cavity where the scrubbing tower tray 10 is located, and the overflow side is spaced from the inner wall of the cavity where the scrubbing tower tray 10 is located. The receiving plate group extends in the horizontal direction and both ends extend to different positions on the mating side respectively. The area above the weir plate 11 surrounded by the receiving plate group and the inner wall of the cavity where the scrubbing tower tray 10 is located is the receiving area 101. A first sewage discharge hole 103 is provided on the weir plate 11 corresponding to the receiving area 101. The overflow plate 12 is arranged on the overflow side. The overflow plate 12 extends in the horizontal direction and both ends extend to the connection positions of the mating side and the overflow side respectively. The area above the weir plate 11 surrounded by the overflow plate 12, the receiving plate group and the inner wall of the cavity where the scrubbing tower tray 10 is located is the overflow area 102. A second sewage discharge hole 104 is provided at the bottom of the overflow plate 12. The lower edge of the second sewage discharge hole 104 is flush with the bottom wall of the overflow area 102.

[0027] In this embodiment, by providing the first sewage discharge hole 103 and the second sewage discharge hole 104 on the scrubbing tower tray 10, solid particles and the like can be discharged from the scrubbing tower tray 10 through the first sewage discharge hole 103 and the second sewage discharge hole 104, avoiding the accumulation of solid particles and the like at the bottom of the scrubbing tower tray 10, thereby preventing the scaling and blockage of the scrubbing tower tray 10. This is beneficial to improving the gas-liquid contact, washing effect, and product purity of the rectification (distillation) tower on the scrubbing tower tray 10. At the same time, it can also effectively extend the operation cycle of the gasifier and further extend the operation cycles of the downstream conversion, purification, and synthesis systems. On the other hand, this anti-blocking design can be directly processed on the original scrubbing tower tray 10 without spending too much processing cost.

[0028] Specifically, the lower edge of the second drain hole 104 is flush with the bottom wall of the overflow area 102, which is conducive to ensuring smooth flow of the solid shell and avoiding the situation where the lower edge of the second drain hole 104 is higher than the bottom wall of the overflow area 102, which will form a step that is not conducive to the discharge of solid particles.

[0029] Preferably, the shapes, arrangement positions, etc. of the first drain hole 103 and the second drain hole 104 can be designed and processed according to actual needs to further ensure the smooth flow of solid particles.

[0030] There are multiple overflow sides, which are spaced apart along the periphery of the weir plate 11. A matching side is formed between any two overflow sides, and any overflow side is provided with an overflow plate 12. In this embodiment, Figure 1 and Figure 2 As shown, there are two overflow sides, which are symmetrically arranged and divided into two symmetrical mating sides, and both overflow sides are provided with overflow plates 12. Furthermore, through the receiving plate group and the receiving area 101 in this embodiment, uniform overflow can be achieved for the two overflow areas 102 symmetrically arranged on both sides of the receiving area 101, which is conducive to controlling and ensuring that the overflow amount on both sides is the same.

[0031] It is understandable that the number of overflow sides and the corresponding overflow plates 12 can be adjusted according to actual conditions and is not limited to two in this embodiment.

[0032] like Figure 1 and Figure 2 As shown, the receiving plate group includes two receiving plates 13 parallel to each other, the overflow plate 12 and the two receiving plates 13 are vertically arranged above the weir plate 11, and the washing tower tray 10 also includes a downcomer 14 arranged below the weir plate 11. The downcomer 14 is arranged on the overflow side and is coplanar with the overflow plate 12.

[0033] In this embodiment, the fluid enters the receiving area 101 from the top of the receiving area 101. For the fluid entering the receiving area 101, a small part of the fluid will be discharged from the first drain hole 103 carrying solid particles to avoid accumulation of scaling. The amount of fluid entering the receiving area 101 is greater than the amount discharged from the first drain hole 103. After a period of time, the fluid will fill the receiving area 101. As the fluid continues to be filled, the fluid will overflow into the overflow areas 102 on both sides. For the fluid entering the overflow area 102, a small part of the fluid will be discharged from the second drain hole 104 carrying solid particles to avoid accumulation of scaling. The amount of fluid entering the overflow area is greater than the amount discharged from the second drain hole 104. After a period of time, the fluid will fill the overflow area 102. As the fluid continues to be filled, the fluid will overflow from above the overflow plates 12 on both sides of the washing tower tray 10 and flow down along the outside of the overflow plate 12 and the outside of the downcomer plate 14.

[0034] Among them, the top of the current collection plate group is flush with the top of the overflow plate 12, or the top of the current collection plate group is located above the top of the overflow plate 12. As Figure 1 shown, in this embodiment, the top of the current collection plate group is located above the top of the overflow plate 12, that is, the height of the area surrounded by the current collection plate group is higher than the height of the area between the two overflow plates 12.

[0035] In this embodiment, there are multiple first sewage discharge holes 103, and the multiple first sewage discharge holes 103 are arranged at intervals along the extending direction of the current receiving area 101. There are multiple second sewage discharge holes 104, and the multiple second sewage discharge holes 104 are arranged at intervals along the extending direction of the overflow plate 12. Such a setting ensures the discharge effect of solid particles and the like in the syngas scrubbing tower without reducing the flushing water volume. It can be understood that the number of the first sewage discharge holes and the second sewage discharge holes can be adjusted according to the actual situation, and no examples are given here one by one.

[0036] Specifically, the opening height of the second sewage discharge hole 104 is 10 - 30 mm, and the opening length of the second sewage discharge hole 104 is 50 - 100 mm. Such a setting facilitates designing the area of the second sewage discharge hole 104 according to the actual situation, ensuring the sewage discharge effect on the basis of not affecting the effect of the scrubbing tower tray 10 itself, avoiding the situation that most solid particles cannot be discharged easily when the size of the second sewage discharge hole 104 is too small, and also avoiding the situation that the large fluid discharge amount affects the effect of the scrubbing tower tray 10 itself when the size of the second sewage discharge hole 104 is too large.

[0037] It can be understood that the size (length × width) of the first sewage discharge hole 103 can be designed according to the actual situation, and it is only necessary to ensure the sewage discharge effect on the basis of not affecting the effect of the scrubbing tower tray 10 itself.

[0038] Another embodiment of the present utility model provides a scrubbing tower, which includes a tower body 20, a receiving plate 30 arranged in the tower body 20, and the above-mentioned scrubbing tower tray 10. The mating side is in limit fit with the inner wall of the tower body 20. The receiving plate 30 is arranged below the scrubbing tower tray 10. There is a gap area 201 between the projection of the scrubbing tower tray 10 on the radial plane of the tower body 20 and the outer periphery of the tower body 20. The projection of the receiving plate 30 on the radial plane of the tower body 20 at least covers the gap area 201.

[0039] In this embodiment, the fluid that overflows from above the two overflow plates 12 of the scrubbing tower tray 10 and flows down along the outer sides of the overflow plate 12 and the downcomer 14 will flow onto the lower receiving plate 30. There can be multiple scrubbing tower trays 10, and the multiple scrubbing tower trays 10 are arranged at intervals along the axial direction of the tower body 20 to improve the reliability of the scrubbing tower.

[0040] Preferably, the lower end of the downcomer 14 can be inclined to slow down the impact of the fluid on the receiving plate 30.

[0041] Wherein, the receiving plate 30 includes a horizontal plate section 31 and a vertical plate section 32. The horizontal plate section 31 is connected to the inner wall of the tower body 20. The vertical plate section 32 is parallel to the downcomer 14 of the scrubbing tower tray 10 and is located inside the downcomer 14. The horizontal plate section 31 is located below the downcomer 14, and the top of the vertical plate section 32 is higher than the bottom of the downcomer 14. In this embodiment, the receiving plate 30 also realizes the collection and discharge of the fluid by means of overflow.

[0042] It should be noted that most of the solid particles and the like accumulated in the receiving plate 30 will be discharged as the water flow descends. The solid particles and the like will not stay and accumulate in large quantities, and the accumulation amount is small. During operation, there is no need to deal with them, and there will be no blockage. It is only necessary to clean the solid particles and the like in the receiving plate 30 during the overall shutdown and maintenance of the device.

[0043] In this embodiment, the water volume flowing to the water receiving area 101 is the total water volume A, the solid discharge water volume discharged from the first sewage discharge hole 103 is D, the overflow water volume overflowing from the overflow area 102 is C, and the discharge water volume discharged from the second sewage discharge hole 104 is B. The total water volume A = discharge water volume B + overflow water volume C + solid discharge water volume D. The overflow water volume C > 0 t / h, which can ensure that the liquid layer on the tray does not affect, and the easily blocked substances are continuously discharged from the first sewage discharge hole 103 and the second sewage discharge hole 104. Generally, the sewage discharge volume of the first sewage discharge hole 103 is controlled ≤ 20 t / h, so as to achieve the purpose of preventing the tray from being blocked.

[0044] For the scrubbing tower tray 10 and the scrubbing tower provided by the present utility model, the first sewage discharge hole 103 and the second sewage discharge hole 104 can be processed by the following method;

[0045] 1. Judge the type of failure, and judge the blockage position of the tray according to the inspection during the shutdown and maintenance of the device;

[0046] 2. Collect data, collect the total water volume data of the scrubbing tower tray 10 at this position according to the lowest control index water volume data (A);

[0047] 3. Calculate the flow rate. When ensuring that the flushing water of the scrubbing tower tray 10 overflows on the overflow plate 12, the drainage volume of the first sewage discharge hole 103 ≤ 20 t / h (i.e., the solid discharge water volume D), and calculate the maximum total opening area of the second sewage discharge hole 104 on the overflow plate 12 to obtain the required water volume after opening (i.e., the discharge water volume B);

[0048] 4. Implement the transformation, determine the opening number and opening size of the first sewage discharge hole 103 according to the total opening area of the first sewage discharge hole 103, and determine the opening number and opening size of the second sewage discharge hole 104 according to the total opening area of the second sewage discharge hole 104.

[0049] In summary, the present utility model provides a scrubber tray 10 and a scrubber, enabling the syngas scrubber to achieve long-term and full-load continuous operation of the gasifier without reducing the flushing water volume, and extending the operation cycle of the gasifier. It reduces the risk of forced shutdown of the gasifier, downstream conversion, purification, and synthesis systems, extends the operation cycle of the gasifier, reduces the costs generated by furnace shutdown for maintenance, reduces economic losses, and effectively improves production efficiency. At the same time, it reduces unnecessary startup and shutdown operations of the gasification system and downstream conversion, purification, and synthesis systems, minimizes its impact on the entire system, and reduces the labor intensity and workload of operators and maintenance personnel. Compared with the prior art, the present utility model can further wash the process gas on the premise of increasing the flushing water volume of the scrubber tray 10 of the syngas scrubber. The dust content in the process gas of the scrubber is lower than that of the aerospace furnace scrubber, and the dust content after washing reaches <0.5mg / m 3 , ensuring the stable operation of the subsequent system. At the same time, it can prevent the scrubber tray 10 of the syngas scrubber from being deposited, fouled, and blocked, extend the service life of the device, and achieve the goal of continuous full-load operation for 220 days.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0052] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0053] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0054] In addition, it should be noted that using words such as "first", "second", etc. to limit the components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above-mentioned words have no special meanings. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0055] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A scrubber tray, characterized in that, The tray of the scrubbing tower includes a weir plate (11), an overflow plate (12) and a receiving plate group arranged on the weir plate (11). The outer periphery of the weir plate (11) includes a mating side and an overflow side. The mating side is used for limiting cooperation with the inner wall of the cavity where the tray of the scrubbing tower is located. The overflow side is spaced from the inner wall of the cavity where the tray of the scrubbing tower is located. The receiving plate group extends in the horizontal direction and its two ends respectively extend to different positions of the mating side. The area above the weir plate (11) surrounded by the receiving plate group and the inner wall of the cavity where the tray of the scrubbing tower is located is the receiving area (101). A first sewage discharge hole (103) is provided on the weir plate (11) corresponding to the receiving area (101). The overflow plate (12) is arranged on the overflow side. The overflow plate (12) extends in the horizontal direction and its two ends respectively extend to the connection positions of the mating side and the overflow side. The area above the weir plate (11) surrounded by the overflow plate (12), the receiving plate group and the inner wall of the cavity where the tray of the scrubbing tower is located is the overflow area (102). A second sewage discharge hole (104) is provided at the bottom of the overflow plate (12). The lower edge of the second sewage discharge hole (104) is flush with the bottom wall of the overflow area (102).

2. The tray of the scrubbing tower according to claim 1, characterized in that, There are multiple overflow sides. The multiple overflow sides are spaced along the outer periphery of the weir plate (11). A mating side is formed between any two overflow sides. An overflow plate (12) is provided on each overflow side.

3. The tray of the scrubbing tower according to claim 1, characterized in that, The receiving plate group includes two parallel receiving plates (13). The overflow plate (12) and the two receiving plates (13) are all vertically arranged above the weir plate (11). The tray of the scrubbing tower further includes a downcomer (14) arranged below the weir plate (11). The downcomer (14) is arranged on the overflow side and is coplanar with the overflow plate (12).

4. The tray of the scrubbing tower according to claim 1, wherein The top of the receiving plate group is flush with the top of the overflow plate (12), or the top of the receiving plate group is located above the top of the overflow plate (12).

5. The tray of the scrubbing tower according to claim 1, characterized in that, There are multiple first sewage discharge holes (103). The multiple first sewage discharge holes (103) are spaced along the extending direction of the receiving area (101).

6. The tray of the scrubbing tower according to claim 1, wherein There are multiple second sewage discharge holes (104). The multiple second sewage discharge holes (104) are spaced along the extending direction of the overflow plate (12).

7. The tray of the scrubbing tower according to claim 1, characterized in that, The opening height of the second sewage discharge hole (104) is 10 - 30 mm.

8. The tray of the scrubbing tower according to claim 1, characterized in that, The opening length of the second sewage discharge hole (104) is 50 - 100 mm.

9. A scrubbing tower, characterized in that, The scrubbing tower includes a tower body (20), a receiving plate (30) arranged in the tower body (20), and the scrubbing tower tray according to any one of claims 1 to 8. The mating side is in limit fit with the inner wall of the tower body (20). The receiving plate (30) is arranged below the scrubbing tower tray. There is a gap region (201) between the projection of the scrubbing tower tray on the radial plane of the tower body (20) and the outer periphery of the tower body (20). The projection of the receiving plate (30) on the radial plane of the tower body (20) covers at least the gap region (201).

10. The scrubbing tower according to claim 9, characterized in that, The scrubbing tower tray is the scrubbing tower tray according to claim 3. The receiving plate (30) includes a horizontal plate section (31) and a vertical plate section (32). The horizontal plate section (31) is connected to the inner wall of the tower body (20). The vertical plate section (32) is parallel to the downcomer (14) of the scrubbing tower tray and is located inside the downcomer (14). The horizontal plate section (31) is located below the downcomer (14). The top of the vertical plate section (32) is higher than the bottom of the downcomer (14).

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