Activated carbon venturi structure

Abstract

The application relates to the technical field of activated carbon conveying, in particular to an activated carbon Venturi tube structure. The activated carbon Venturi tube structure comprises a first integral structure formed by integrally arranging a throat pipe and a diffusion section, a second integral structure formed by integrally arranging a nozzle and a contraction section, and a feeding pipe, the first integral structure, the second integral structure and the feeding pipe are detachably connected and communicated through a three-way connecting pipe, and the throat pipe and the nozzle are oppositely and spacedly arranged; the first integral structure and the second integral structure are made of high-hardness and high-wear-resistance materials, and the high-hardness and high-wear-resistance materials adopt GCr15 bearing steel materials. The technical problem of the short service life and the quick wear of the existing activated carbon Venturi tube is solved.

Description

Technical Field

[0001] This application relates to the field of activated carbon delivery technology, and more particularly to an activated carbon venturi tube structure. Background Technology

[0002] Activated carbon venturi tubes are an application in the field of activated carbon conveying. They are typically specially designed pipes, mainly composed of a contraction section, a throat, and a diffuser section. Their working principle is that when gas passes through the venturi tube, a high-speed, low-pressure zone is created at the throat. This low pressure draws in activated carbon, which is then thoroughly mixed with the gas and transported to the designated location. Activated carbon adsorption is used in other applications, where activated carbon is injected into the flue gas produced by combustion to adsorb harmful substances such as heavy metals and dioxins, reducing pollutant emissions and meeting environmental standards.

[0003] However, activated carbon particles possess high kinetic energy under the influence of high-speed airflow, constantly eroding the inner wall of the venturi tube, especially in the contraction section and throat. The high airflow velocity and the resulting impact frequency and force of the particles on the tube wall cause gradual wear over time, leading to thinning of the wall. Furthermore, the activated carbon itself has a certain hardness and angularity, acting like sandpaper to rub against the tube wall as it flows through the pipe, accelerating the wear process. In addition, the gas-solid two-phase flow within the venturi tube is complex, exhibiting uneven velocity distribution and eddies. In eddy regions, activated carbon particles generate irregular trajectories, causing additional wear on the tube wall. Moreover, the uneven distribution of solid particle concentration in the gas-solid two-phase flow exacerbates wear in areas with excessively high local concentrations. For example, near the inlet, the concentrated entry of activated carbon particles easily creates high-concentration areas, leading to faster wear in these areas. Therefore, existing activated carbon venturi tubes suffer from rapid wear and short service life. Utility Model Content

[0004] The purpose of this application is to provide an activated carbon venturi tube structure to solve the technical problems of rapid wear and short service life of existing activated carbon venturi tubes.

[0005] This application provides an activated carbon venturi tube structure, comprising:

[0006] The first integral structure is formed by an integrated throat and a diffuser section, and the second integral structure is formed by an integrated nozzle and a converging section, as well as a feed pipe. The first integral structure, the second integral structure and the feed pipe are detachably connected and communicate with each other through a three-way connecting pipe. The throat and the nozzle are opposite to each other and spaced apart.

[0007] The first integral structure and the second integral structure are made of high-hardness, high-wear-resistant materials, and the high-hardness, high-wear-resistant materials are GCr15 bearing steel.

[0008] Furthermore, the three-way connecting pipe includes two first connecting pipes and second connecting pipes extending in the transverse direction and open on both sides, and a third connecting pipe extending in the longitudinal direction and open upward. The first connecting pipe is connected to the first integral structure, the second connecting pipe is connected to the second integral structure, and the third connecting pipe is connected to the feed pipe. The three-way connecting pipe has a mixing chamber where the three ends meet.

[0009] Furthermore, the feed pipe is vertically arranged and connected to the third connecting pipe;

[0010] The diffuser section, the throat, the nozzle, and the constriction section extend sequentially along the same transverse axis.

[0011] Furthermore, the first connecting pipe is detachably and fixedly connected to the outer wall of the first integral structure, and the second connecting pipe is detachably and fixedly connected to the outer wall of the nozzle of the second integral structure through an end plate.

[0012] Furthermore, the diffusion section of the first integral structure and the contraction section of the second integral structure are respectively fitted and welded to the first flange and the second flange;

[0013] The outer ring of the second flange is provided with a screw for adjusting the position of the nozzle.

[0014] Furthermore, the contraction section of the second integral structure is connected to the activated carbon injection pipe;

[0015] When the total length of the activated carbon injection pipe is within 100m and the number of bends does not exceed 8, the nozzle adopts a specification with an inner diameter of 14mm and there is no need to adjust the nozzle position, or the nozzle adopts a specification with an inner diameter of 13mm and the nozzle is adjusted to move forward by 4~5mm.

[0016] When the total length of the activated carbon injection pipe exceeds 120m and the number of bends exceeds 10, the nozzle adopts a specification with an inner diameter of 13mm, and there is no need to adjust the nozzle position.

[0017] Furthermore, the total length of the second integral structure is 135mm, the total length of the nozzle is 71mm, and the wall thickness of the nozzle is 3mm;

[0018] The end plate is detachably connected to the outer wall of the nozzle at the middle and rear position with a clearance fit. There is a gap of 9±5mm between the rear wall of the end plate and the contact position between the nozzle and the contraction section.

[0019] Furthermore, the throat is a straight tube of equal diameter, and the diffusion section includes a first diffusion section and a second diffusion section that are integrally connected to the opposite ends of the throat.

[0020] The first diffusion section and the second diffusion section have an outward diffusion tilt angle of 15° based on the throat.

[0021] The throat tube is a straight tube of equal diameter with an inner diameter of 21mm.

[0022] Furthermore, the feed pipe includes an equal-diameter straight pipe section and a variable-diameter shrinkage section connected vertically;

[0023] The constant diameter straight pipe section has an outer diameter of 89mm, and the tapered section has an outer diameter of 48mm.

[0024] Furthermore, the feed pipe and the tee connecting pipe are made of 304 stainless steel; and / or

[0025] The feed pipe and the tee connecting pipe are integrated into one unit.

[0026] Compared with existing technologies, the activated carbon venturi tube structure provided in this application addresses the high-wear areas of the activated carbon venturi tube structure, such as the throat, diffuser, nozzle, and constriction section. This application achieves this by making the components in these high-wear areas easily disassembled for regular replacement and maintenance. For example, the throat and diffuser are integrated into a first integral structure and detachably connected to a tee connector; the nozzle and constriction section are integrated into a second integral structure and detachably connected to a tee connector. This ensures long-term wear resistance of the high-wear structural parts, improves the overall durability of the activated carbon venturi tube structure, and extends its service life. Furthermore, these high-wear structural components, such as the first and second integral structures, are made of high-hardness, high-wear-resistant materials, such as GCr15 bearing steel, to effectively resist the high-speed impact and severe friction of activated carbon particles. This improves the wear resistance of the material itself, reduces the wear caused by activated carbon particles, and solves the technical problems of rapid wear and short service life in existing activated carbon venturi tubes. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1This is a schematic diagram of the overall structure of the activated carbon venturi tube structure provided in the embodiments of this application.

[0029] Figure 2 This is a schematic diagram of the first overall structure provided in the embodiments of this application;

[0030] Figure 3 This is a schematic diagram of the second overall structure provided in the embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the structure of the feed pipe and the tee connecting pipe provided in the embodiments of this application;

[0032] Figure 5 This is a schematic diagram of the end plate provided in an embodiment of this application.

[0033] Figure label:

[0034] 10-First overall structure;

[0035] 11-Trench;

[0036] 12-Diffusion section;

[0037] 121 - First diffusion section;

[0038] 122 - Second diffusion section;

[0039] 13-First Embedded Interface;

[0040] 20 - Second overall structure;

[0041] 21- Nozzle;

[0042] 22-Contraction segment;

[0043] 30 - Feed pipe;

[0044] 31 - Straight pipe section of equal diameter;

[0045] 32- Variable diameter contraction section;

[0046] 40-Tee connector;

[0047] 41 - First connecting pipe;

[0048] 42 - Second connecting pipe;

[0049] 43 - Third connecting pipe;

[0050] 44-Mixed Chamber;

[0051] 50-End plate;

[0052] 51-Second Embedded Interface;

[0053] 61-First flange;

[0054] 62-Second flange. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0057] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0058] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0060] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0061] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0062] like Figures 1 to 5 As shown in the figure, this application provides an activated carbon venturi tube structure, which includes a first integral structure 10 formed by an integrally disposed throat 11 and a diffuser section 12, a second integral structure 20 formed by an integrally disposed nozzle 21 and a converging section 22, and a feed pipe 30 for feeding activated carbon. The first integral structure 10, the second integral structure 20 and the feed pipe 30 are detachably connected and communicate with each other through a three-way connecting pipe 40. The throat 11 and the nozzle 21 are opposite to each other and spaced apart. The first integral structure 10 and the second integral structure 20 are made of a high-hardness and high-wear-resistant material, which is GCr15 bearing steel.

[0063] Compared with the prior art, the activated carbon venturi tube structure provided in this application embodiment has high wear parts, such as the throat 11, diffuser section 12, nozzle 21 and constriction section 22. This application embodiment makes the structural components in the high wear areas individually detachable. For example, the throat 11 and diffuser section 12 are integrated to form a first integral structure 10 and are detachably connected to the three-way connecting pipe 40 (specifically, it can be connected to its first connecting pipe 41). The nozzle 21 and constriction section 22 are integrated to form a second integral structure 20 and are detachably connected to the three-way connecting pipe 40 (specifically, it can be connected to its second connecting pipe 42). This allows the components in the high wear areas to be easily disassembled and regularly replaced for maintenance, so as to ensure the wear resistance of the high wear structural parts for a long time, improve the durability of the entire activated carbon venturi tube structure and extend its service life.

[0064] Furthermore, the high-wear structural components of the first integral structure 10 and the second integral structure 20 are made of high-hardness, high-wear-resistant materials, such as GCr15 bearing steel, to effectively resist the high-speed impact and severe friction of activated carbon particles. This improves the wear resistance of the material itself, reduces the wear caused by activated carbon particles, and solves the technical problem of rapid wear and short service life of existing activated carbon venturi tubes. Bearing steel has work hardening characteristics, and its surface will harden rapidly when subjected to high-speed impact and severe friction of activated carbon particles, significantly increasing its hardness, effectively resisting wear, and extending the service life of the throat and constriction section.

[0065] For minor wear components such as the feed pipe 30 and the tee connecting pipe 40, materials with different levels of hardness and wear resistance can be used. For example, 304 stainless steel can be used. Low alloy wear-resistant steel itself has a certain degree of wear resistance, which improves the surface hardness and wear resistance, can resist minor wear, and does not need to be replaced frequently, thus saving costs.

[0066] Furthermore, for ease of installation and connection, the feed pipe 30 and the tee connecting pipe 40 can also be integrated into a single structure.

[0067] like Figure 1 and Figure 4 As shown, in a specific embodiment of the three-way connecting pipe 40, the three-way connecting pipe 40 may include two first connecting pipes 41 and second connecting pipes 42 that extend in the lateral direction and are open on both sides, and a third connecting pipe 43 that extends in the longitudinal direction and is open upward.

[0068] The first connecting pipe 41 is connected to the aforementioned first integral structure 10, specifically it can be detachably connected and fixed to the outer wall of the first integral structure 10. The second connecting pipe 42 is connected to the aforementioned second integral structure 20, specifically it can be detachably connected and fixed to the outer wall of the second integral structure 20. The third connecting pipe 43 is connected to the aforementioned discharge pipe 30, specifically it can be integrally connected and fixed to the discharge pipe 30. The three-way connecting pipe 40 has a mixing chamber 44 where the three-way pipes (i.e., the first connecting pipe 41, the second connecting pipe 42 and the third connecting pipe 43 intersect) inside.

[0069] Specifically, the feed pipe 30 is vertically arranged, and the diameter axes of the diffuser section 12, the throat 11, the nozzle 21 and the contraction section 22 extend sequentially along the same transverse axis. The nozzle 21 is aligned with the throat 11 to increase installation accuracy.

[0070] Furthermore, it is preferable that the tee connecting pipe 40 is an equal-diameter tee connecting pipe, that is, the first connecting pipe 41, the second connecting pipe 42 and the third connecting pipe 43 have the same pipe diameter. For example, in the specific embodiment given in this application, the pipe diameter is 48mm. Then, the outer diameter of the first integral structure 10 connected to the first connecting pipe 41 can be 48mm.

[0071] So, specifically, such as Figure 1 and Figure 5 As shown, the second connecting pipe 42 can be detachably and fixedly connected to the outer wall of the nozzle 21 of the second integral structure 20 through the end plate 50, so as to improve the connection reliability and ensure that the nozzle 21 can extend along the same transverse axis as the diffuser section 12 and the throat 11.

[0072] Furthermore, the end plate 50 can be detachably connected to the outer wall of the middle and rear part of the nozzle 21 with a gap fit. The minimum gap can be 10 mils. There is a gap between the rear wall of the end plate 50 and the contact position of the nozzle 21 and the contraction section 22. The gap is 9mm±5mm. The front and rear movable gap is used to adjust the negative pressure of the feed pipe.

[0073] During installation, if the connections of the activated carbon venturi tube structure are not secure, vibrations can easily occur under the impact of the gas-solid two-phase flow, leading to increased wear. Furthermore, improper installation angles and positions of the pipes can alter the flow state of the activated carbon particles, increasing the risk of localized wear.

[0074] To improve connection stability and connection accuracy, such as Figure 1 As shown, the diffusion section 12 (specifically the first diffusion section 121) of the first integral structure 10 and the contraction section 22 of the second integral structure 20 can be fitted and welded to the first flange 61 and the second flange 62 respectively.

[0075] Preferably, the outer ring of the second flange 62 may be provided with a screw for adjusting the position of the nozzle 21. Since the inner diameter of the nozzle 21 affects the outlet air pressure of the blower, the higher the air pressure, the higher the flow velocity at the outlet of the nozzle 21, and the greater the negative pressure generated around the nozzle 21. If the negative pressure exceeds -2kPa, it will affect the accuracy of the activated carbon loss weighing value, resulting in inaccurate flow rate. Therefore, it is sometimes necessary to adjust the position of the nozzle 21.

[0076] One specific embodiment is, as follows: Figure 1 and Figure 3As shown, the constriction section 22 of the second integral structure 20 is connected to the activated carbon injection pipe. The total length of the second integral structure 20 can be 135 mm, the total length of the nozzle 21 can be 71 mm, the wall thickness of the nozzle 21 can be 3 mm, the port of the constriction section 22 can be selected with an outer diameter of 46 mm, which can be the same as the outer diameter of the diffuser section 12 (e.g., 48 mm), and the inner diameter of the diffuser section 12 can be 37 mm.

[0077] Therefore, when the total length of the activated carbon injection pipe is within 100m and the number of bends does not exceed 8, the nozzle 21 can be of the specification with an inner diameter of 14mm, and there is no need to adjust the position of the nozzle 21. Alternatively, the nozzle 21 can be of the specification with an inner diameter of 13mm, but the nozzle 21 needs to be moved forward by 4~5mm. This is because if the nozzle 21 with an inner diameter of 13mm is used at this time, it will cause the negative pressure of the feed pipe 30 to be too large. Therefore, the nozzle 21 needs to be moved forward slightly by 4~5mm to adjust the negative pressure to the normal value.

[0078] When the total length of the activated carbon injection pipe exceeds 120m and the number of bends exceeds 10, the nozzle 21 can be of the specification with an inner diameter of 13mm, and there is no need to adjust the position of the nozzle 21.

[0079] To further improve connection stability, such as Figure 2 As shown, the connection points of the first integral structure 10 with the first connecting pipe 41 of the three-way connecting pipe 40 and with the first flange 61 can be provided with embedded connection slots, such as the first embedded interface 13, with a depth of 2mm and a length of 10~20mm.

[0080] Similarly, such as Figure 5 As shown, an embedded connection slot, such as a second embedded interface 51, can also be provided at the connection point between the end plate 50 and the second connecting pipe 42 of the three-way connecting pipe 40. The depth can be 2mm and the length can be 10~20mm, preferably 15mm, to improve the connection stability and reduce vibration.

[0081] like Figure 1 and Figure 2 As shown, regarding the first integral structure 10, in a specific embodiment, the throat 11 can be a straight pipe of equal diameter, specifically with an inner diameter of 21mm; the diffuser section 12 may include a first diffuser section 121 and a second diffuser section 122 that are integrally connected to the opposite ends of the throat 11, preferably the first diffuser section 121 and the second diffuser section 122 have an outward diffuser tilt angle of 15° based on the throat 11.

[0082] like Figure 1 and Figure 4As shown, regarding the feed pipe 30, in a specific embodiment, the feed pipe 30 can be a variable diameter feed pipe 30, which can specifically include an equal diameter straight pipe section 31 and a variable diameter shrinkage section 32 connected at the top and bottom; specifically, the equal diameter straight pipe section 31 can be a specification with an outer diameter of 89mm, and the shrinkage section 32 can be a specification with an outer diameter of 48mm.

[0083] The activated carbon venturi tube structure provided in this application can be connected to the appropriate size according to the characteristics of different industrial pipelines. For example, if the pipeline is DN40-50, the size design provided in this application can be used as a reference. For other pipeline sizes, the size can be enlarged or reduced proportionally.

[0084] Furthermore, the following is the specific manufacturing process of the activated carbon venturi tube structure provided in the embodiments of this application:

[0085] I. Manufacturing process for severely worn parts (such as the first integral structure 10 and the second integral structure 20):

[0086] Step 1: Machining of bearing steel materials

[0087] Material inspection: Purchase materials with chromium content of 1.30~1.65%, carbon content of 0.95~1.05%, manganese content of 0.20~0.40%, silicon content of 0.15~0.35%, and phosphorus and sulfur content of ≤0.025%. Verify quality certification documents and use a spectrometer to test chemical composition to ensure compliance with standards. Use a hardness tester to randomly check the hardness of raw materials, which should be within the range of HB179-207.

[0088] Material cutting and forming: According to the design drawings, the profile is precisely cut using a CNC plasma cutting machine to form the preliminary shape of the first integral structure 10 and the second integral structure 20.

[0089] Machining: The parts are precision machined using lathes, milling machines, and other equipment to ensure the matching degree between parts, and the inner wall roughness Ra≤12.5μm. The fit error between each part is controlled within 10 microns, and all marked weld positions are firmly welded with argon arc welding.

[0090] Step 2: Component Assembly

[0091] Welding preparation: Clean the welding area of ​​the component to remove oil and rust; use welding wire that matches the bearing steel (such as ER308).

[0092] Welding operation: Use multi-layer, multi-pass welding process, control the welding current at 90-100A, and the welding speed at 8-12cm / min; after each layer is welded, clean the slag in time and hammer the weld to relieve stress. After welding, the weld height should not be less than the thickness of the base material, and the surface should be flat, free of pores and cracks.

[0093] Quality inspection: Ultrasonic testing is performed on the welded parts to ensure that there are no defects inside the weld.

[0094] II. Manufacturing process for slightly worn parts (feed pipe 30 and tee connecting pipe 40):

[0095] Step 1: Fabrication of low-alloy wear-resistant steel pipes

[0096] Pipe cutting: According to the design length, use a metal circular saw to cut the low alloy wear-resistant steel pipe. The cut should be flat and burr-free, and the length error should be controlled within ±2mm.

[0097] Beveling: A beveling machine is used to process V-shaped bevels at both ends of the pipe. The beveling angle is 60°±5° and the blunt edge is 1~2mm to facilitate subsequent welding.

[0098] Welding assembly: The welding process adopts argon arc welding for the root pass and electric arc welding for the filler and cover pass. After the welding is completed, the weld is visually inspected and there must be no defects such as undercut or incomplete penetration.

[0099] III. Overall Assembly and Debugging

[0100] Component assembly: According to the activated carbon venturi tube structure, the first integral structure 10, the second integral structure 20, the feed pipe 30, and the tee connecting pipe 40 are assembled in sequence. After the major components are fitted together and the center is found, they are connected and fixed with screws with a length of 300~350mm. The center is tested to ensure that the coaxiality error of each component does not exceed 0.5mm.

[0101] Minor wear areas: Low-alloy wear-resistant steel itself has a certain degree of wear resistance, which improves surface hardness and wear resistance, and can resist minor wear. It basically does not need to be replaced, and there is still no obvious wear after about 10 years of use.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An activated carbon venturi tube structure, characterized in that, include: The first integral structure is formed by an integrated throat and a diffuser section, and the second integral structure is formed by an integrated nozzle and a converging section, as well as a feed pipe. The first integral structure, the second integral structure and the feed pipe are detachably connected and communicate with each other through a three-way connecting pipe. The throat and the nozzle are opposite to each other and spaced apart. The first integral structure and the second integral structure are made of high-hardness, high-wear-resistant materials, and the high-hardness, high-wear-resistant materials are GCr15 bearing steel.

2. The activated carbon venturi tube structure according to claim 1, characterized in that, The three-way connecting pipe includes two first connecting pipes and second connecting pipes that extend in the transverse direction and are open on both sides, and a third connecting pipe that extends in the longitudinal direction and is open upward. The first connecting pipes are connected to the first integral structure, the second connecting pipes are connected to the second integral structure, and the third connecting pipe is connected to the feed pipe. The three-way connecting pipe has a mixing chamber where the three ends meet.

3. The activated carbon venturi tube structure according to claim 2, characterized in that, The feeding pipe is arranged vertically and is connected to the third connecting pipe. The diffuser section, the throat, the nozzle, and the constriction section extend sequentially along the same transverse axis.

4. The activated carbon venturi tube structure according to claim 3, characterized in that, The first connecting pipe is detachably and fixedly connected to the outer wall of the first integral structure, and the second connecting pipe is detachably and fixedly connected to the outer wall of the nozzle of the second integral structure through an end plate.

5. The activated carbon venturi tube structure according to claim 4, characterized in that, The diffusion section of the first integral structure and the contraction section of the second integral structure are respectively fitted and welded to the first flange and the second flange; The outer ring of the second flange is provided with a screw for adjusting the position of the nozzle.

6. The activated carbon venturi tube structure according to claim 4 or 5, characterized in that, The contraction section of the second integral structure is connected to the activated carbon injection pipe; When the total length of the activated carbon injection pipe is within 100m and the number of bends does not exceed 8, the nozzle adopts a specification with an inner diameter of 14mm and there is no need to adjust the nozzle position, or the nozzle adopts a specification with an inner diameter of 13mm and the nozzle is adjusted to move forward by 4~5mm. When the total length of the activated carbon injection pipe exceeds 120m and the number of bends exceeds 10, the nozzle adopts a specification with an inner diameter of 13mm, and there is no need to adjust the nozzle position.

7. The activated carbon venturi tube structure according to claim 6, characterized in that, The total length of the second integral structure is 135mm, the total length of the nozzle is 71mm, and the wall thickness of the nozzle is 3mm; The end plate is detachably connected to the outer wall of the nozzle at the middle and rear position with a clearance fit. There is a gap between the rear wall of the end plate and the contact position between the nozzle and the contraction section, and the gap is 9±5mm.

8. The activated carbon venturi tube structure according to claim 3, characterized in that, The throat is a straight tube of equal diameter, and the diffusion section includes a first diffusion section and a second diffusion section that are integrally connected to the opposite ends of the throat. The first diffusion section and the second diffusion section have an outward diffusion tilt angle of 15° based on the throat. The throat tube is a straight tube of equal diameter with an inner diameter of 21mm.

9. The activated carbon venturi tube structure according to claim 3, characterized in that, The feed pipe includes an equal-diameter straight pipe section and a variable-diameter shrinkage section connected at the top and bottom; The constant diameter straight pipe section has an outer diameter of 89mm, and the tapered section has an outer diameter of 48mm.

10. The activated carbon venturi tube structure according to claim 1, characterized in that, The feeding pipe and the tee connecting pipe are made of 304 stainless steel; and / or The feed pipe and the tee connecting pipe are integrated into one unit.

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