Pulverized coal distribution concentration adjusting device of medium-speed coal mill

Abstract

The invention discloses a medium-speed coal mill pulverized coal distribution concentration adjusting device which comprises a flow guide table, an annular groove is formed in the flow guide table, a circulating groove is formed in the position, above and below the annular groove, in the flow guide table in a penetrating mode and communicates with the annular groove, and a driving assembly is arranged on the back face of the flow guide table. The driving assembly comprises an air cylinder body and a sliding plate which is pushed to synchronously ascend and descend according to the telescopic end of the air cylinder body, and an opening and closing assembly which can be pushed to synchronously rotate along with the sliding plate is arranged on the back face of the flow guide table and comprises a worm and a worm gear which are in meshed contact to achieve rotary self-locking. A baffle assembly capable of synchronously rotating to control pulverized coal concentration adjustment is arranged in the position, located in the annular groove, of the side face of the opening and closing assembly. The device is high in sealing reliability and stability.

Description

Technical Field

[0001] This invention belongs to the field of coal powder distribution concentration adjustment technology, and relates to a coal powder distribution concentration adjustment device for a medium-speed coal mill. Background Technology

[0002] Pulverized coal boilers use a coal mill to grind lumpy coal into powder, which is then fed into the burners via pipes using air. Each burner group is supplied with pulverized coal by a single coal mill connected to multiple outlets in the pulverized coal supply pipeline. The even distribution of pulverized coal across all pipelines is crucial. Excessive deviations in pulverized coal concentration distribution can cause boiler flameout, while uneven distribution leads to increased combustible content in fly ash and decreased boiler efficiency. Currently, most power plants compensate for this deviation by increasing secondary air volume. However, increasing secondary air volume also has side effects, increasing flue gas losses and nitrogen oxide emissions.

[0003] CN217952350U discloses a coal powder distribution concentration adjustment device for a medium-speed coal mill, including a coal powder concentration control mechanism, a distributed control system, a detection system, and guide baffles. Each static separator of the medium-speed coal mill has a set of guide baffles at its coal powder outlet end. Each set of guide baffles is connected to the coal powder concentration control mechanism, which is fixedly installed on the outer wall of the coal powder feeding pipeline. The coal powder concentration control mechanism controls the rotation of each set of guide baffles. The detection system is installed on the coal powder feeding pipeline, and the distributed control system is connected to the coal powder concentration control mechanism and the detection system. The coal powder concentration is adjusted by automatically or manually starting the coal powder concentration control mechanism to control the angle of each set of guide baffles. Alternatively, the detection system can collect data such as pressure, concentration, and flow rate, which are transmitted to the distributed control system. The distributed control system compares the values ​​from each primary air duct and directly calculates the opening degree of each set of guide baffles. The coal powder concentration control mechanism then opens or closes each set of guide baffles to a suitable angle. When the pulverized coal concentration deviates in four or more pipelines within a medium-speed coal mill, the direction of the guide baffles is automatically adjusted, automatically deflecting the pipeline with a high pulverized coal concentration towards the pipeline with a low pulverized coal concentration. This achieves the effect of regulating the pulverized coal concentration. This invention relates to an automatic pulverized coal concentration adjustment device. To address the problems in existing technology where excessive deviations in pulverized coal concentration distribution from a medium-speed coal mill to a pulverized coal boiler cause boiler flameout, uneven distribution, increased combustible matter in boiler fly ash, and decreased boiler efficiency, this invention provides a pulverized coal concentration adjustment device for a medium-speed coal mill. It includes a pulverized coal concentration control mechanism, a distributed control system, a detection system, and guide baffles. Each static separator of the medium-speed coal mill has a set of guide baffles at its pulverized coal outlet end. Each set of guide baffles is connected to the pulverized coal concentration control mechanism, which is fixedly installed on the outer wall of the pulverized coal delivery pipeline. The pulverized coal concentration control mechanism controls the rotation of each set of guide baffles. The detection system is installed on the pulverized coal delivery pipeline, and the distributed control system is connected to the pulverized coal concentration control mechanism and the detection system.

[0004] Publication No. CN103822224A discloses a fully automatic pulverized coal concentration regulating device for a coal mill. The device includes a flat, plate-shaped pulverized coal concentration regulating baffle installed within the pulverized coal distributor on the coal mill, corresponding to a pulverized coal pipe. The baffle is rotatably mounted on a rotating shaft. A drive device is installed on the coal mill and connected to the rotating shaft. A control unit issues a corresponding control signal based on the current pulverized coal concentration measurement result within the corresponding pulverized coal pipe. The drive device drives the rotating shaft to rotate by a corresponding angle according to the control signal, thereby changing the direction of pulverized coal airflow. The axis of the rotating shaft is parallel to the axis of the pulverized coal pipe, and the rotating shaft is perpendicular to the pulverized coal concentration regulating baffle. The rotating shaft is installed inside the pulverized coal distributor, and the axis of the rotating shaft intersects with the axis of the pulverized coal pipe. The pulverized coal concentration regulating baffle is installed inside the pulverized coal distributor, at a certain distance from the inlet of the pulverized coal pipe, and is adapted to the inner diameter of the pulverized coal pipe. The pulverized coal concentration regulating baffle is automatically adjusted by a drive device such as a motor and a cylinder. The pulverized coal concentration regulating baffle rotates around the rotating shaft, and the amount of pulverized coal entering each pulverized coal pipe is adjusted by changing the direction of pulverized coal movement, thereby achieving the purpose of regulating the pulverized coal concentration.

[0005] The existing problems mentioned above are as follows:

[0006] 1. Insufficient sealing reliability: The rotating shaft of the guide baffle is directly exposed to the coal powder flow and is supported only by ordinary bearings. Coal powder is prone to enter the rotating mechanism, causing jamming or wear. Frequent maintenance is required for long-term operation.

[0007] 2. Poor adjustment stability: The baffle angle adjustment relies on direct connection with an external actuator and has no self-locking structure. Pipe vibration or airflow impact can easily cause the baffle angle to deviate, resulting in deviation in the secondary distribution of pulverized coal concentration. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a coal powder distribution concentration regulating device for a medium-speed coal mill, which has high sealing reliability and stability.

[0009] To achieve the above objectives, this invention discloses a coal powder distribution concentration regulating device for a medium-speed coal mill, comprising a guide platform with an annular groove inside. A flow channel is formed through the guide platform at the top and bottom of the annular groove, and the flow channel is connected to the annular groove. A drive assembly is provided on the back of the guide platform, comprising a cylinder body and a sliding plate that moves synchronously up and down according to the extension and retraction of the cylinder body. An opening and closing assembly is provided on the back of the guide platform, capable of rotating synchronously with the sliding plate. The opening and closing assembly includes a worm gear and a worm wheel that mesh to achieve rotational self-locking. A baffle assembly capable of rotating synchronously to control the coal powder concentration regulation is provided on the side of the opening and closing assembly within the annular groove.

[0010] A further improvement of the medium-speed coal mill pulverized coal distribution concentration adjustment device of the present invention is as follows:

[0011] Furthermore, the drive assembly also includes a cylinder mounting bracket, which is fixedly connected to the back of the guide vane.

[0012] Furthermore, the cylinder body is fixedly installed on the inner side of the cylinder mounting bracket, and a connecting plate is fixedly connected to the telescopic end of the cylinder body. The outer side of the connecting plate is fixedly connected to the sliding plate.

[0013] Furthermore, the drive assembly also includes a toothed groove group, which is evenly distributed on the front of the slide plate.

[0014] Furthermore, the guide platform also includes a rail groove, which is formed on the back of the annular groove and corresponds to the position of the slide plate.

[0015] Furthermore, the opening and closing assembly also includes a side frame, which is symmetrically and fixedly connected to the back of the flow guide platform;

[0016] The opening and closing assembly also includes a first rotating shaft, which is rotatably connected to the middle of the two sets of side frames, and the first rotating shaft is fixedly connected to the worm gear.

[0017] Furthermore, the opening and closing assembly also includes a toothed disc, which is fixedly connected to the first rotating shaft and is in contact with and meshed with the tooth groove assembly for transmission.

[0018] Furthermore, the opening and closing assembly also includes a second rotating shaft and a sealed bearing. The sealed bearing is located at the through slot on the back of the guide platform. The outer ring of the sealed bearing is fixedly connected to the guide platform, and the inner ring of the sealed bearing is fixedly connected to the second rotating shaft. The second rotating shaft is fixedly connected to the worm gear.

[0019] Furthermore, the baffle assembly includes a stainless steel frame, which is fixedly connected to the second rotating shaft, and a sintered silicon carbide ceramic substrate is fixedly connected to the outside of the stainless steel frame.

[0020] Furthermore, wear-resistant skirts are distributed on the outer sides of both the stainless steel skeleton and the sintered silicon carbide ceramic substrate.

[0021] The present invention has the following beneficial effects:

[0022] In specific operation, the coal powder distribution concentration regulating device for medium-speed coal mill described in this invention has a second rotating shaft that passes through the guide platform via a sealed bearing, with the outer ring of the bearing fixedly connected to the equipment to form a static seal. The baffle assembly is entirely built into the sealed cavity of the annular groove, and only contacts the coal powder flow through the rotating surface, blocking the coal powder from intruding into the transmission chain side, thereby achieving physical isolation between the rotating shaft and the coal powder and eliminating the risk of jamming. The lifespan of the sealed bearing is effectively improved, the maintenance cycle is significantly extended, and the sealing reliability and stability are high.

[0023] Furthermore, the opening and closing assembly adopts a worm gear and worm wheel meshing transmission instead of the traditional direct connection mechanism; the reverse self-locking characteristics of the worm gear and worm wheel ensure that the baffle angle cannot be spontaneously offset due to vibration after it is fixed, so as to eliminate the baffle angle drift caused by airflow impact, ensure the long-term stability of coal powder concentration adjustment, and eliminate the need for secondary calibration.

[0024] Furthermore, the baffle assembly adopts a composite structure of stainless steel frame and sintered silicon carbide ceramic matrix, with the ceramic layer hardness reaching Hv of over 2,000; an anti-wear skirt is added to cover the edge gaps, reducing the scouring of the shaft joint by high-speed coal powder, making the wear resistance of the silicon carbide ceramic matrix five times that of ordinary steel baffles, and the skirt design fills the edge wear gaps of traditional baffles.

[0025] Furthermore, the rotation of the worm gear drives the rotation of the worm wheel. Utilizing the self-locking property of the worm gear and worm wheel (when the worm lead angle is less than the friction angle, only the worm can drive the worm wheel, resulting in reverse self-locking), the baffle assembly is prevented from unexpectedly shifting due to coal dust impact or vibration, ensuring the stability of the adjustment position. The transmission ratio of the worm gear and worm wheel is typically 10:1-60:1, converting the linear motion of the cylinder into low-speed, high-torque rotation of the baffle, adapting to the high-resistance conditions of coal dust flow. This replaces traditional hydraulic or electric adjustment mechanisms, reducing the risk of hydraulic oil leakage or motor overload; it also occupies little space behind the guide platform, facilitating the retrofitting of existing coal mills. Attached Figure Description

[0026] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 This is a front view of the overall device of the present invention;

[0028] Figure 2 This is a schematic diagram of the driving component and the opening / closing component of the present invention;

[0029] Figure 3 This is a schematic diagram of the overall baffle assembly of the present invention;

[0030] Figure 4 This is a schematic diagram of the baffle assembly of the present invention disassembled;

[0031] Among them, 1 is the flow guide platform, 11 is the annular groove, 12 is the flow channel, 13 is the rail groove, 2 is the drive assembly, 21 is the cylinder mounting bracket, 22 is the cylinder body, 23 is the connecting plate, 24 is the sliding plate, 241 is the gear groove assembly, 3 is the opening and closing assembly, 31 is the side frame, 32 is the first rotating shaft, 321 is the gear plate, 322 is the worm gear, 33 is the second rotating shaft, 331 is the sealed bearing, 332 is the worm wheel, 4 is the baffle assembly, 41 is the stainless steel skeleton, 411 is the wear-resistant skirt, and 42 is the sintered silicon carbide ceramic substrate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0034] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0036] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0037] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0040] Example 1

[0041] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4The medium-speed coal mill coal powder distribution concentration adjustment device of the present invention includes a guide platform 1, an annular groove 11 is provided inside the guide platform 1, and a flow channel 12 is provided through the guide platform 1 at the top and bottom of the annular groove 11. The flow channel 12 is connected to the annular groove 11. A drive assembly 2 is provided on the back of the guide platform 1. The drive assembly 2 includes a cylinder body 22 and a sliding plate 24 that moves synchronously up and down according to the extension and retraction of the cylinder body 22. An opening and closing assembly 3 that can rotate synchronously with the sliding plate 24 is provided on the back of the guide platform 1. The opening and closing assembly 3 includes a worm gear 322 and a worm wheel 332 that mesh with each other to achieve rotational self-locking. A baffle assembly 4 that can rotate synchronously to control the coal powder concentration adjustment is provided on the side of the opening and closing assembly 3 in the annular groove 11.

[0042] Example 2

[0043] Please refer to the embodiments described in this invention. Figures 1-4 The present invention provides a technical solution: a coal powder distribution concentration adjustment device for a medium-speed coal mill, including a guide platform 1, an annular groove 11 is provided inside the guide platform 1, and a flow channel 12 is provided through the guide platform 1 at the top and bottom of the annular groove 11. The flow channel 12 is connected to the annular groove 11. A drive assembly 2 is provided on the back of the guide platform 1. The drive assembly 2 includes a cylinder body 22 and a sliding plate 24 that can move synchronously up and down with the extension and retraction end of the cylinder body 22. An opening and closing assembly 3 that can rotate synchronously with the sliding plate 24 is also provided on the back of the guide platform 1. The opening and closing assembly 3 includes a worm gear 322 and a worm wheel 332 that mesh with each other to achieve rotational self-locking. A baffle assembly 4 that can rotate synchronously to control the coal powder concentration adjustment is provided on the side of the opening and closing assembly 3 in the annular groove 11.

[0044] This design features triple upgrades: worm gear self-locking, sealed cavity isolation, and composite wear-resistant materials, making it especially suitable for coal-fired power plant environments with high dust and strong vibration.

[0045] The drive assembly 2 also includes a cylinder mounting bracket 21, which is fixedly connected to the back of the guide vane 1;

[0046] The cylinder body 22 is fixedly installed inside the cylinder mounting bracket 21. The telescopic end of the cylinder body 22 is fixedly connected to the connecting plate 23. The outer side of the connecting plate 23 is fixedly connected to the slide plate 24.

[0047] The drive assembly 2 also includes a toothed groove group 241, which is evenly distributed on the front of the slide plate 24;

[0048] The guide platform 1 also includes a rail groove 13, which is formed on the back of the annular groove 11 and corresponds to the position of the slide plate 24.

[0049] The opening and closing assembly 3 also includes a side frame 31, which is symmetrically and fixedly connected to the back of the flow guide 1. The opening and closing assembly 3 also includes a first rotating shaft 32, which is rotatably connected to the middle of the two sets of side frames 31. The first rotating shaft 32 is fixedly connected to the worm gear 322.

[0050] The opening and closing assembly 3 also includes a toothed disc 321, which is fixedly connected to one end of the first rotating shaft 32. The toothed disc 321 is in contact with the tooth groove group 241 and is in meshing transmission connection.

[0051] The opening and closing assembly 3 also includes a second rotating shaft 33 and a sealed bearing 331. The sealed bearing 331 is located at the through slot on the back of the guide platform 1. The outer ring of the sealed bearing 331 is fixedly connected to the guide platform 1, and the inner ring of the sealed bearing 331 is fixedly connected to the second rotating shaft 33. One end of the second rotating shaft 33 is also fixedly connected to the worm gear 332.

[0052] The baffle assembly 4 includes a stainless steel frame 41, which is fixedly connected to the other end of the second rotating shaft 33. A sintered silicon carbide ceramic substrate 42 is fixedly connected to the outside of the stainless steel frame 41.

[0053] The stainless steel frame 41 and the sintered silicon carbide ceramic substrate 42 are provided with wear-resistant skirts 411 on their outer sides.

[0054] The working principle and usage process of this invention are as follows:

[0055] When it is necessary to adjust the amount of pulverized coal falling at the flow channel 12 in order to control the pulverized coal concentration distribution;

[0056] The cylinder body 22 can be activated so that the extension end of the cylinder body 22 drives the connecting plate 23 and the slide plate 24 to move vertically on the back of the guide platform 1. At this time, the tooth groove group 241 located on the front of the slide plate 24 will drive the tooth disk 321 to rotate, and the first rotating shaft 32 located inside the tooth disk 321 will rotate synchronously between the two sets of side frames 31.

[0057] When the first rotating shaft 32 rotates, the worm 322 located outside the first rotating shaft 32 will rotate synchronously. Under the meshing and rotation of the worm 322 and the worm wheel 332, the second rotating shaft 33 located inside the worm wheel 332 will rotate synchronously. At this time, the second rotating shaft 33 can drive the stainless steel frame 41 to rotate in the annular groove 11.

[0058] The above steps can adjust the rotation angle of the stainless steel frame 41 in the annular groove 11, thereby controlling the falling rate of pulverized coal in the annular groove 11 and thus controlling the pulverized coal concentration distribution.

[0059] It is worth noting that the circuits, electronic components, and modules involved in this invention are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this invention does not involve improvements to the software and methods.

[0060] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0061] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0062] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A coal powder distribution concentration regulating device for a medium-speed coal mill, characterized in that, The system includes a flow guide platform (1), which has an annular groove (11) inside. A flow channel (12) is provided through the flow guide platform (1) above and below the annular groove (11). The flow channel (12) is connected to the annular groove (11). A drive assembly (2) is provided on the back of the flow guide platform (1). The drive assembly (2) includes a cylinder body (22) and a slide plate (24) that moves synchronously up and down according to the extension and retraction of the cylinder body (22). An opening and closing assembly (3) that can rotate synchronously with the slide plate (24) is provided on the back of the flow guide platform (1). The opening and closing assembly (3) includes a worm gear (322) and a worm wheel (332) that mesh to achieve rotational self-locking. A baffle assembly (4) that can rotate synchronously to control the coal powder concentration adjustment is provided on the side of the opening and closing assembly (3) inside the annular groove (11).

2. The coal powder distribution concentration regulating device for a medium-speed coal mill according to claim 1, characterized in that, The drive assembly (2) also includes a cylinder mounting bracket (21), which is fixedly connected to the back of the guide platform (1).

3. The medium-speed coal mill pulverized coal distribution concentration regulating device according to claim 2, characterized in that, The cylinder body (22) is fixedly installed on the inner side of the cylinder mounting bracket (21). The telescopic end of the cylinder body (22) is fixedly connected to a connecting plate (23), and the outer side of the connecting plate (23) is fixedly connected to the sliding plate (24).

4. The medium-speed coal mill pulverized coal distribution concentration regulating device according to claim 3, characterized in that, The drive assembly (2) also includes a toothed groove group (241), which is evenly distributed on the front of the slide plate (24).

5. The coal powder distribution concentration regulating device for a medium-speed coal mill according to claim 1, characterized in that, The guide platform (1) also includes a rail groove (13), which is formed on the back of the annular groove (11) and corresponds to the position of the slide plate (24).

6. The coal powder distribution concentration regulating device for a medium-speed coal mill according to claim 1, characterized in that, The opening and closing assembly (3) also includes a side frame (31), which is symmetrically fixedly connected to the back of the flow guide (1); The opening and closing assembly (3) also includes a first rotating shaft (32), which is rotatably connected to the middle of the two sets of side frames (31), and the first rotating shaft (32) is fixedly connected to the worm gear (322).

7. The coal powder distribution concentration regulating device for a medium-speed coal mill according to claim 6, characterized in that, The opening and closing assembly (3) also includes a toothed disc (321), which is fixedly connected to the first rotating shaft (32). The toothed disc (321) is in contact with and meshes with the tooth groove group (241).

8. The medium-speed coal mill pulverized coal distribution concentration regulating device according to claim 7, characterized in that, The opening and closing assembly (3) also includes a second rotating shaft (33) and a sealed bearing (331). The sealed bearing (331) is located at the through slot on the back of the guide platform (1). The outer ring of the sealed bearing (331) is fixedly connected to the guide platform (1), and the inner ring of the sealed bearing (331) is fixedly connected to the second rotating shaft (33). The second rotating shaft (33) is fixedly connected to the worm gear (332).

9. The medium-speed coal mill pulverized coal distribution concentration regulating device according to claim 8, characterized in that, The baffle assembly (4) includes a stainless steel frame (41), which is fixedly connected to the second rotating shaft (33), and a sintered silicon carbide ceramic substrate (42) is fixedly connected to the outside of the stainless steel frame (41).

10. The medium-speed coal mill pulverized coal distribution concentration regulating device according to claim 9, characterized in that, The stainless steel skeleton (41) and the outer side of the sintered silicon carbide ceramic matrix (42) are both provided with wear-resistant skirts (411).

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