Distributor and extraction column

Abstract

The application relates to a distributor and an extraction tower, the distributor comprising a main body and a baffle, a tapered hole being formed in the main body, a narrow opening of the tapered hole being arranged as a medium inlet, the main body being provided with a backflushing channel, one end of the backflushing channel being communicated with the tapered hole, the other end of the backflushing channel being communicated with an external space of the main body, the baffle being fixedly arranged at a wide opening of the tapered hole and used for backflushing part of the medium entering the tapered hole into the backflushing channel. By arranging the baffle at the wide opening of the distributor, the medium jet flowing into the narrow opening of the tapered hole is partially blocked and backflushed, the backflushed medium flows through the backflushing channel and flows to the outside of the main body, when the distributor is arranged in the extraction tower, the medium flowing to the outside of the main body can impact the tower wall, solid residues or crystallization on the inner wall and the bottom wall of the extraction tower are prevented from being agglomerated into blocks, so that manual cleaning is not needed, the number of production line shutdowns due to cleaning is reduced, and production efficiency is ensured.

Description

Technical Field

[0001] This application relates to the field of hydrometallurgical technology, and in particular to a distributor and extraction tower. Background Technology

[0002] In liquid-liquid extraction processes, the extraction tower is the core equipment for achieving two-phase separation and extraction of target components, and it is widely used in various industrial fields such as chemical, pharmaceutical, and environmental protection. During actual operation, solid residues and crystallization buildup easily occur at the bottom of the extraction tower. These deposits can easily cause pipeline blockages, seriously affecting the normal operation and process stability of the extraction tower and even the entire production line.

[0003] Currently, the industry standard for cleaning involves manual entry into the tower after the production line is shut down. This method not only exposes workers to harsh working conditions such as the confined space and residual harmful substances inside the tower, but also poses safety hazards. Furthermore, prolonged production line shutdowns lead to a significant decrease in production efficiency, failing to meet production demands and resulting in substantial production pressure and economic losses. Utility Model Content

[0004] Therefore, it is necessary to provide a distributor and extraction tower to efficiently clean the solid residue and crystals at the bottom of the tower, reduce manual cleaning costs, and lower production pressure and economic losses.

[0005] This application provides a distributor, including a main body and a baffle. A conical hole is formed through the main body, and the narrow opening of the conical hole is set as a medium inlet. The main body is provided with a backflushing channel, one end of which is connected to the conical hole and the other end of which is connected to the external space of the main body. The baffle is fixedly disposed at the wide opening of the conical hole and is used to backflush part of the medium entering the conical hole into the backflushing channel.

[0006] In one embodiment, the baffle extends radially from the sidewall of the body along the tapered hole.

[0007] In one embodiment, the baffle has a through hole extending through the conical hole along its axial direction, and the projection range of the baffle along the axial direction of the conical hole covers the backflow channel.

[0008] In one embodiment, multiple recoil channels are provided, and the multiple recoil channels are evenly distributed along the circumference of the conical hole.

[0009] This application also provides an extraction tower, including a lower end cap and a pulse power input pipe. The lower end cap is provided with a distributor, which is the distributor described above. One end of the pulse power input pipe is connected to the narrow opening of the distributor, and the other end is connected to a pulse power device.

[0010] In one embodiment, at least a portion of the inner bottom surface of the lower end cap is sloped.

[0011] In one embodiment, the angle between the inclined surface of the inner bottom surface of the lower end cap and the direction of gravity is 30° to 60°.

[0012] In one embodiment, an anti-crystallization layer is provided on the inner bottom surface of the lower end cap.

[0013] In one embodiment, the side of the backflush channel away from the conical hole is the outlet, and the outlet of the backflush channel is parallel to the central axis of the conical hole; or, the outlet of the backflush channel is oriented towards the central axis of the conical hole, and the angle between the outlet of the backflush channel and the central axis of the conical hole is 7.5° to 30°; or, a portion of the outlet of the backflush channel is parallel to the central axis of the conical hole, and another portion of the outlet of the backflush channel is oriented towards the central axis of the conical hole, and the angle between the outlet of the backflush channel and the central axis of the conical hole is 7.5° to 30°.

[0014] In one embodiment, the backflush channel is a channel that penetrates the side wall of the main body; or, the side wall of the main body has a through channel that connects to an extension tube, the channel and the extension tube constitute the backflush channel, and the extension tube extends from the end away from the main body toward the inner bottom surface of the lower end cap.

[0015] Compared with the prior art, the distributor and extraction tower provided in this application, by setting a baffle at the wide opening of the distributor, cause part of the medium jet injected from the narrow opening of the conical hole to be blocked by the baffle and backflow. The backflowing medium flows through the backflow channel and flows to the outside of the main body. When the distributor is set in the extraction tower, the medium flowing to the outside of the main body can impact the tower wall, preventing solid residues or crystals on the inner wall and bottom wall of the extraction tower from agglomerating into lumps. Therefore, manual cleaning is not required, reducing the number of production line shutdowns required for cleaning and ensuring production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective top view of a distributor according to an embodiment of this application;

[0018] Figure 2 This is a side sectional view of a distributor according to an embodiment of this application;

[0019] Figure 3 This is a side sectional view of an extraction tower according to an embodiment of this application;

[0020] Figure 4 This is a side view of the lower end cap connected to the distributor according to an embodiment of this application;

[0021] Figure 5 A cross-sectional view of the connection between the lower end cap and the distributor after the extension tube is installed on the distributor;

[0022] Figure 6 This is a side sectional view of the connection between the distributor and the pulse tube according to an embodiment of this application;

[0023] Figure 7 A 3D view showing the installation of extension tubes on the distributor;

[0024] Figure 8 A side sectional view of the distributor with the extension tube installed.

[0025] Reference numerals: 100, distributor; 101, main body; 102, baffle; 103, conical hole; 104, narrow opening; 105, backflow channel; 106, wide opening; 107, through hole; 108, extension pipe; 200, lower end cap; 201, pulse power input port; 202, light phase inlet; 300, tower body; 301, heavy phase inlet; 302, light phase overflow port; 303, sieve plate; 304, heavy phase outlet; 305, reserved port; 306, pressure relief port; 401, pulse pipe; 402, pulse control structure; 500, anti-crystallization layer. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," "side," "top," "bottom," and similar expressions used in this application's specification are merely for describing various exemplary structural parts and elements of this application. However, their use herein is for illustrative purposes only and is determined based on the exemplary orientations shown in the accompanying drawings, and does not represent the only possible implementation. Since the embodiments disclosed in this application can be arranged in different orientations, these terms indicating orientation are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that "axial arrangement" means that the overall arrangement direction is along the axial direction, including but not limited to axial extension, and may be at an angle to the axial direction.

[0031] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0032] Please see Figure 1 and Figure 2This application provides a distributor 100, including a main body 101 and a baffle 102. A conical hole 103 is provided through the main body 101. The narrow opening 104 of the conical hole 103 is set as a medium inlet. A backflushing channel 105 is provided in the main body 101. One end of the backflushing channel 105 is connected to the conical hole 103, and the other end is connected to the external space of the main body 101. The baffle 102 is fixedly installed at the wide opening 106 of the conical hole 103 for backflushing part of the medium entering the conical hole 103 into the backflushing channel 105.

[0033] It is understandable that after the liquid medium is injected from the narrow opening 104, it will diffuse and spray towards the wide opening 106. This application addresses this by providing a baffle 102 at the wide opening 106. The baffle 102 can backflush the liquid medium injected towards the baffle 102 into the backflush channel 105. The backflushed liquid medium is then ejected through the backflush channel 105 to the outside of the main body 101, thus redistributing the flow direction of the liquid medium. For example... Figure 2 As shown, the hollow arrow indicates the flow direction of the liquid medium.

[0034] See Figure 1 and Figure 2 In some embodiments of this application, the baffle 102 extends radially from the side wall of the main body 101 along the conical hole 103, that is, the baffle 102 is perpendicular to the axial direction of the conical hole 103. It can be understood that the arrangement of extending radially along the conical hole 103 facilitates the baffle 102 to backflush the medium entering the conical hole 103 into the backflush channel 105, and makes the installation of the baffle 102 more convenient and quick.

[0035] It is also worth mentioning that the arrangement of the baffle 102 extending radially along the conical hole 103 facilitates the calculation of the backflow angle of the liquid medium, and the backflow channel 105 is set based on the backflow angle of the liquid medium. Specifically, the liquid medium enters from the narrow opening 104 of the conical hole 103 along the axial direction of the conical hole 103, and then diffuses and sprays in the middle section of the conical hole 103. Some of the liquid medium will backflow after impacting the baffle 102. Since the baffle 102 is arranged to extend radially along the conical hole 103, the backflow angle of the liquid medium is the angle between the spray direction and the axial direction of the conical hole 103.

[0036] See Figure 1 and Figure 2 In some embodiments of this application, a through hole 107 is provided in the baffle 102 along the axial direction of the conical hole 103. Projected orthogonally along the axial direction of the conical hole 103, the projection range of the baffle 102 covers the backflow channel 105. Optionally, the baffle 102 is annular and fixed at the wide opening 106 of the conical hole 103. The annular hole of the baffle 102 is the through hole 107, facilitating the discharge of some liquid medium from the wide opening 106 of the conical hole 103.

[0037] See Figure 1 and Figure 2In some embodiments of this application, multiple backflush channels 105 are provided, and the multiple backflush channels 105 are evenly distributed along the circumference of the conical hole 103, which can improve the structural symmetry and stability. In addition, such a distributor 100 can spray backflush liquid medium in different directions around the circumference of the main body 101, which can have an impact cleaning effect on the outer circumference of the main body 101. For example, when applied to an extraction tower, it can perform impact cleaning on the side walls or bottom walls of the extraction tower.

[0038] Optionally, the number and inner diameter of the backflushing channels 105, as well as the diameter of the through holes 107, can be selected based on the specifications of the extraction tower. For common extraction towers, the number of backflushing channels 105 is 12 to 48, the inner diameter of the backflushing channels 105 is 5 mm to 30 mm, and the diameter of the through holes 107 of the baffle 102 is 20 mm to 80 mm. Thus, the distributor 100 can be applied to most extraction towers to meet the corresponding cleaning requirements.

[0039] See Figures 3 to 6 This application also provides an extraction tower, including a lower head 200 and a pulse tube 401. A distributor is disposed in the lower head 200, and the distributor adopts the distributor 100 as described in any of the above embodiments. One end of the pulse tube 401 is connected to the narrow opening of the distributor 100, and the other end is connected to a pulse control structure 402. During extraction, the extraction tower uses a large amount of liquid working medium to be mixed. The extraction tower equipped with this distributor 100 can simultaneously use the liquid working medium as a cleaning medium for the inner wall of the tower, allowing the tower to be cleaned without interrupting operation, eliminating the need for manual entry into the tower for cleaning, reducing the number of shutdowns caused by cleaning, and thus ensuring production efficiency. In addition, the impact force of the liquid medium can also quickly discharge dispersed solid residues and crystals, thereby reducing pipeline blockage problems.

[0040] The function of an extraction column is to mix and extract light and heavy phase liquid media. Common light phase liquid media include organic liquid media, and heavy phase liquid media include water. Specifically, an extraction column generally includes a column body 300. The top of the column body 300 is equipped with a heavy phase inlet 301, a light phase overflow outlet 302, and a pressure discharge outlet 306; a sieve plate 303 is installed in the middle of the column body 300; and the bottom of the column body 300 is equipped with a light phase inlet 202, a heavy phase outlet 304, and a reserved outlet 305. See also Figure 5 and Figure 6 In this application, a pulse power input port 201 is also provided at the bottom of the tower body 300. A pulse tube 401 is inserted through the pulse power input port 201, and one end of the pulse tube 401 extends into the tower and communicates with the narrow opening 104, while the other end extends outside the extraction tower and connects to the pulse control structure 402.

[0041] Solid residues and crystals tend to accumulate on the inner wall of the bottom of the tower body 300. Large pieces of solid residues and crystals fall into the heavy phase outlet 304, which can easily cause blockage of the heavy phase outlet 304 and subsequent process pipelines. The distributor 100 is installed at the bottom of the tower body 300 to perform impact cleaning on the inner wall of the bottom of the tower body 300.

[0042] The column is filled with a heavy phase medium. A light phase medium enters the column from bottom to top through the light phase inlet 202 and mixes with the heavy phase medium for extraction. See also... Figure 6 It is understandable that, since the tower is filled with heavy phase medium, the conical orifice 103 of the distributor 100 is also filled with heavy phase medium, and the pulse tube 401 also contains some heavy phase medium. The pulse control structure 402 inputs pulse power into the pulse tube 401, which sprays the heavy phase medium in the pulse tube 401 from the narrow orifice 104 into the conical orifice 103 to form a jet. Under the action of the baffle 102, the jet is backflowed into the backflow channel 105, and finally ejected from the backflow channel 105 and impacts the inner wall of the bottom of the tower body 300, breaking up the solid residue and crystals that have accumulated and adhered to the inner wall of the bottom of the tower body 300.

[0043] Since the pulse control structure 402 inputs pulse power to the pulse tube 401, when the pulse control structure 402 outputs power, the heavy phase medium in the pulse tube 401 will be injected into the narrow orifice 104; when the pulse control structure 402 does not output power, the heavy phase medium will flow from the narrow orifice 104 into the pulse tube 401 for use in the next injection.

[0044] In the embodiments of this application, the through hole 107 provided on the baffle 102 allows the conical hole 103 to be quickly filled with heavy phase medium when the pulse control structure 402 is not outputting power, thereby replenishing the heavy phase medium to the pulse tube 401. This prepares for the next input of power to the pulse control structure 402 and the injection of heavy phase medium into the conical hole 103.

[0045] To avoid contaminating both the light and heavy phase media, the pulse control structure 402 employs a gas pulse device.

[0046] The heavy phase medium jet injected from the narrow opening 104 of the distributor 100 is partially blocked by the baffle 102 and backflowed into the backflow channel 105, from where it is then ejected outward from the main body 101. The injected heavy phase medium not only impacts the sidewalls and bottom wall of the lower head 200, breaking up accumulated solid residues and crystals into smaller pieces, preventing blockages when they exit through the heavy phase outlet 304, but also accelerates the downward discharge of the dispersed solid residues and crystals. Furthermore, the impact of the heavy phase medium on the sidewalls and bottom wall reduces the re-aggregation and adhesion of subsequent solid residues and crystals on the sidewalls and bottom wall of the lower head 200.

[0047] This reduces the number of times the extraction tower needs to be shut down for cleaning, or even eliminates the need for shutdowns, thus ensuring production line efficiency.

[0048] See Figure 4 At least a portion of the inner bottom surface of the lower head 200 is sloped. In existing extraction towers, the inner bottom surface of the tower body 300 is arc-shaped, making it difficult for solid residues and crystals to slide down quickly and be discharged from the outlet, thus easily causing them to agglomerate. In this application, the sloped inner bottom surface design allows solid residues and crystals to slide quickly towards the heavy phase outlet 304 under their own gravity, and the impact of the backflushing heavy phase medium further reduces the agglomeration and adhesion of solid residues and crystals.

[0049] See also Figure 4 In some preferred embodiments, a portion of the inner bottom surface of the lower head 200 is sloped to reduce the probability of blockage at the heavy phase outlet 304. Specifically, compared to a curved inner bottom surface, solid residues and crystals are more likely to slide down the sloped inner bottom surface. If the entire inner bottom surface of the lower head 200 is sloped, a large number of small pieces of solid residues and crystals on the inner bottom surface of the lower head 200 will slide into the heavy phase outlet 304 after being impacted by the backflowing heavy phase medium, which can easily cause blockage at the heavy phase outlet 304.

[0050] In this embodiment, part of the inner bottom surface of the lower end cap 200 is set as an inclined surface, so that solid residues and crystals on the inclined inner bottom surface will slide into the heavy phase outlet 304 and be discharged faster than solid residues and crystals on the curved inner bottom surface, thereby reducing the probability of blockage of the heavy phase outlet 304.

[0051] In a further embodiment, the angle A between the inclined surface of the inner bottom surface of the lower end cap 200 and the direction of gravity is 30° to 60°. This angle range ensures that the solid residue and crystals on the inclined surface slide downwards at a speed that is neither too fast nor too slow, thus guaranteeing cleaning efficiency while preventing accumulation and blockage due to excessive sliding. Optionally, the angle can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, or any value within the range of 30° to 60°.

[0052] In some embodiments of this application, an anti-crystallization layer 500 is provided on the inner bottom surface of the lower end cap 200. In some preferred embodiments, the anti-crystallization layer 500 is a hydrophobic coating to reduce the accumulation and adhesion of solid residues and crystals on the inner bottom surface of the lower end cap 200.

[0053] The direction of the heavy phase medium jet during backflush is also crucial for cleaning solid residues and crystals on the inner bottom surface of the lower head 200. Specifically, the direction of the heavy phase medium jet during backflush is perpendicular to the inner bottom surface of the lower head 200, ensuring the dispersal of solid residues and crystals, but reducing the discharge rate of solid residues and crystals.

[0054] In some embodiments of this application, the direction of the recoiling heavy-phase medium injection is further designed. See [link to relevant documentation]. Figure 1 and Figure 2 The side of the backflushing channel 105 furthest from the conical orifice 103 is defined as the outlet, and the outlet of the backflushing channel 105 is parallel to the central axis of the conical orifice 103. In the extraction tower, the heavy phase medium enters the narrow opening 104 of the distributor 100 from bottom to top. The central axis of the conical orifice 103 of the distributor 100 is aligned with the direction of gravity, meaning the outlet of the backflushing channel 105 is downward-facing. This not only effectively impacts the inner bottom surface of the lower head 200, dispersing solid residues and crystals, but also rapidly discharges the dispersed solid residues and crystals downwards.

[0055] In other embodiments of this application, see Figure 7 and Figure 8 The outlet of the backflushing channel 105 faces the central axis of the conical bore 103, and the angle B between the outlet of the backflushing channel 105 and the central axis of the conical bore 103 is 7.5° to 30°. This allows the heavy phase medium ejected from the outlet of the backflushing channel 105 to better conform to the inner bottom surface of the lower head 200, and even to be tangential to it, further accelerating the discharge of solid residues and crystals. Of course, the angle can be 7.5°, 15°, 22.5°, 30°, or any value within the range of 7.5° to 30°.

[0056] It is conceivable that in some embodiments of this application, the outlet direction of a portion of the backflush channel 105 is parallel to the central axis of the conical hole 103, while the outlet direction of another portion of the backflush channel 105 is oriented towards the central axis of the conical hole 103, and the angle between the outlet direction of the backflush channel 105 and the central axis of the conical hole 103 is 7.5°~30°. This not only ensures the effective dispersion of solid residues and crystals on the inner bottom surface of the lower head 200 by the backflush heavy phase medium, but also takes into account the discharge efficiency of the dispersed solid residues and crystals.

[0057] See Figure 1 and Figure 2 In some embodiments of this application, the backflush channel 105 is a channel that penetrates the side wall of the main body, and the outlet of the channel is the outlet of the backflush channel 105. The outlet orientation of the backflush channel 105 can be pre-calculated and set when processing the channel.

[0058] See Figure 5 , Figure 7 as well as Figure 8 In some embodiments of this application, a through channel is provided on the side wall of the main body 101, and the channel is connected to an extension tube 108. The channel and the extension tube 108 constitute a backflow channel 105, and the lower end opening of the extension tube 108 is the outlet of the backflow channel 105. In practical applications, the extension tube 108 can be a flexible hose, and the angle of the outlet of the backflow channel 105 can be adjusted by twisting the extension tube 108.

[0059] The extension tube 108 extends away from the main body 101 and down to the inner bottom surface of the lower end cap 200, so that the outlet of the backflushing channel 105 is as close as possible to the inner bottom surface of the lower end cap 200, thereby reducing the kinetic energy loss of the backflushing heavy phase medium before it is sprayed onto the inner bottom surface of the lower end cap 200, and ensuring the effect of dispersing solid residues and crystallization.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A distributor, characterized in that, The device includes a main body (101) and a baffle (102). A conical hole (103) is provided through the main body (101). The narrow opening (104) of the conical hole (103) is set as a medium inlet. The main body (101) is provided with a backflow channel (105). One end of the backflow channel (105) is connected to the conical hole (103), and the other end is connected to the external space of the main body (101). The baffle (102) is fixedly installed at the wide opening (106) of the conical hole (103) to backflow part of the medium entering the conical hole (103) into the backflow channel (105).

2. The distributor according to claim 1, characterized in that, The baffle (102) extends radially from the side wall of the body (101) along the tapered hole (103).

3. The distributor according to claim 1, characterized in that, The baffle (102) has a through hole (107) extending through the conical hole (103) along the axial direction. The projection range of the baffle (102) along the axial direction of the conical hole (103) covers the recoil channel (105).

4. The distributor according to claim 1, characterized in that, Multiple recoil channels (105) are provided, and the multiple recoil channels (105) are evenly distributed along the circumference of the conical hole (103).

5. An extraction tower, characterized in that, include: The lower end cap (200) is provided with a distributor, the distributor being the distributor as described in any one of claims 1 to 4; as well as A pulse tube (401) is connected at one end to the narrow port (104) of the distributor and at the other end to a pulse control structure (402).

6. The extraction tower according to claim 5, characterized in that, At least a portion of the inner bottom surface of the lower end cap (200) is inclined.

7. The extraction tower according to claim 6, characterized in that, The angle between the inclined surface of the inner bottom surface of the lower end cap (200) and the direction of gravity is 30°~60°.

8. The extraction tower according to claim 5, characterized in that, An anti-crystallization layer (500) is provided on the inner bottom surface of the lower end cap (200).

9. The extraction tower according to claim 5, characterized in that, The side of the backflush channel (105) away from the conical hole (103) is the outlet, and the outlet of the backflush channel (105) is parallel to the central axis of the conical hole (103). Alternatively, the outlet of the backflush channel (105) is oriented toward the central axis of the conical hole (103), and the angle between the outlet of the backflush channel (105) and the central axis of the conical hole (103) is 7.5° to 30°. Alternatively, the outlet of a portion of the recoil channel (105) is parallel to the central axis of the conical hole (103), and the outlet of another portion of the recoil channel (105) is oriented toward the central axis of the conical hole (103), with the angle between the outlet of the recoil channel (105) and the central axis of the conical hole (103) being 7.5° to 30°.

10. The extraction tower according to claim 5, characterized in that, The recoil channel (105) is a channel that penetrates the side wall of the main body (101); Alternatively, the main body (101) has a through channel on its side wall, the channel is connected to an extension tube (108), the channel and the extension tube (108) constitute the backflow channel (105), and the extension tube (108) extends from the end away from the main body (101) toward the inner bottom surface of the lower end cap (200).

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