A knife-type gas gate valve and a monitoring system thereof

Abstract

This invention provides a knife-type gas gate valve and its monitoring system, relating to the field of valve technology. The gate valve includes a valve body, a self-heating gate, and a movable sealing seat. An actuator is provided on the valve body, and the self-heating gate is slidably connected to the valve body through the actuator. The movable sealing seat includes an annular fixed seat and a T-shaped compensating ring seat. An annular guide groove is provided on the valve body, communicating with the annular slot of the gate. A connecting hole is opened at the bottom of the annular guide groove, and the end of the connecting hole away from the annular guide groove is connected to an impurity collection component. By setting a movable sealing seat and combining it with a compensating elastic element, this invention enables the T-shaped compensating ring seat to automatically compensate for the sealing gap caused by abrasive wear along the axial direction, thereby overcoming the sealing failure problem caused by the lack of compensation capability of traditional fixed sealing seats. At the same time, the introduction of the self-heating gate can continuously heat and soften the tar adhering to the gate surface, making it easier to peel off.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, specifically relating to a knife-type gas gate valve and its monitoring system. Background Technology

[0002] Knife gate valves, as a key shut-off device, are widely used in gas pipeline networks in metallurgy, chemical industry, and city gas sectors. Their core function is to reliably cut off or connect high-temperature gas media containing impurities such as dust and tar. The sealing reliability of knife gate valves directly affects production safety, energy efficiency, and environmental emissions. However, the special characteristics of gas media (such as the presence of easily condensable heavy tar, corrosive components, and hard particles) place extremely stringent requirements on the lifespan of the valve's sealing components, operational reliability, and maintenance methods. Traditional knife gas gate valve designs often focus on the rigidity of the initial sealing structure, which has inherent limitations in dealing with dynamic failure modes caused by media characteristics during long-term operation, leading to the following drawbacks in existing gas gate valves:

[0003] (1) Existing gas gate valve sealing seats are often installed in a fixed manner and lack automatic compensation function. After long-term use, the sealing seat will experience abrasive wear, leading to sealing failure.

[0004] (2) Due to the lack of self-cleaning components, the tar in the gas will condense and adhere on the sealing surface of the gate during long-term use, causing the gate to be unable to open and close normally.

[0005] (3) During the use of existing gas gate valves, tar and particulate media in the gas will accumulate at the bottom of the valve body, resulting in sealing failure;

[0006] (4) Existing gas gate valves lack component design to cope with medium eddy currents. During the opening process of the knife gate valve or when it is not fully opened, it cannot cope with a series of chain negative effects caused by eddy currents, such as alternating force on the gate valve, mechanical vibration, and wear of the sealing pair. Summary of the Invention

[0007] This invention provides a knife-type gas gate valve and its monitoring system to solve at least one of the technical problems mentioned above.

[0008] To solve the above-mentioned technical problems, the present invention discloses a knife-type gas gate valve, including a valve body, a self-heating gate, a movable sealing seat, and a eddy current reduction component. An actuator is provided on the valve body. The self-heating gate is slidably connected to the valve body through the actuator. The movable sealing seat includes an annular fixed seat and a T-shaped compensating ring seat. An annular slot for the gate is opened in the valve body. The annular fixed seat is installed in the annular slot for the gate and threadedly connected to the valve body. The T-shaped compensating ring seat is slidably connected in the annular fixed seat. A compensating elastic element is fixedly connected to the end face of the valve body located in the annular fixed seat. The end of the compensating elastic element away from the valve body abuts against the T-shaped compensating ring seat. The T-shaped compensating ring seat is used to cooperate with the front of the self-heating gate.

[0009] The valve body is provided with an annular guide groove, which is connected to the annular slot of the gate. A connecting hole is provided at the bottom of the annular guide groove, and the end of the connecting hole away from the annular guide groove is connected to the impurity collection component.

[0010] The eddy current mitigation component is installed inside the short tube of the mitigation component, which is bolted to the output end of the valve body. The eddy current mitigation component includes a fan-shaped baffle plate, which can slide along the axial direction of the short tube of the mitigation component and rotate around its own axis to dynamically adapt to media eddies of different intensities and reduce the damage to the gate valve caused by media eddies when the gate valve is not fully open.

[0011] Preferably, it also includes an active compensation component, which includes an annular electromagnet and an annular magnetic block. The annular electromagnet is fixedly connected to the end face of the valve body located in the annular fixed seat, and the annular magnetic block is fixedly connected to the T-shaped compensation ring seat. The annular electromagnet is electrically connected to an external active compensation controller. The external active compensation controller is used to adjust the magnitude and direction of the current input to the annular electromagnet, so that the annular electromagnet generates a controllable magnetic force acting on the annular magnetic block to drive the T-shaped compensation ring seat to move axially along the valve body.

[0012] Preferably, a steam spiral coil is installed inside the self-heating gate, and an air inlet and a return air inlet are installed on the self-heating gate. One end of the air inlet and the return air inlet are connected to both ends of the steam spiral coil, and the other end of the air inlet and the return air inlet are connected to the air inlet and the return air inlet on the valve body through hoses, respectively. The air inlet and the return air inlet form a circuit with the external steam source.

[0013] Preferably, it also includes a T-shaped valve body ring, and a T-shaped valve body annular mounting groove is provided in the valve body end face that cooperates with the back of the self-heating gate. The T-shaped valve body ring is axially slidably connected in the T-shaped valve body annular mounting groove, and the T-shaped valve body annular mounting groove and the T-shaped valve body ring are connected by a compensating elastic element.

[0014] Preferably, the impurity collection assembly includes a self-heating tar impurity collection box, which is threadedly connected to the bottom of the valve body and communicates with the connecting hole. The self-heating tar impurity collection box is equipped with an auger drive motor, and a conveying auger is fixedly connected to the output end of the auger drive motor. A collection chamber is provided at the auger output end of the self-heating tar impurity collection box. The self-heating tar impurity collection box is equipped with a return air hole, and a one-way valve is provided in the return air hole. The return air hole communicates with the valve body through a pipe.

[0015] Preferably, it also includes a rotary grinding assembly, which includes a rotary drive assembly and a scraper. The scraper is bolted to the inner wall of the T-shaped compensation ring seat, and the working surface of the scraper is in contact with the self-heating gate. The rotary drive assembly is used to drive the T-shaped compensation ring seat to rotate.

[0016] The rotary drive assembly includes a rotary drive motor, which is fixedly connected to the outer shell of the valve body. A first winding wheel is fixedly connected to the output end of the rotary drive motor. A transition wheel and a second winding wheel are rotatably connected to the outer shell of the valve body. A steel wire is wound on the first winding wheel. The steel wire is output from the first winding wheel, passes over the transition wheel, and winds onto the second winding wheel. A return torsion spring is provided on the shaft of the second winding wheel. One end of the return torsion spring is fixedly connected to the shaft of the second winding wheel, and the other end is fixedly connected to the inner wall of the valve body. A meshing gear is coaxially connected to the second winding wheel. A meshing toothed ring is circumferentially fixedly connected to the T-shaped compensating ring seat. The meshing gear and the meshing toothed ring mesh with each other.

[0017] Preferably, the eddy current mitigation component further includes an adjusting slider. The inner wall of the short tube of the mitigation component has two symmetrically arranged adjusting grooves. The adjusting slider is slidably connected in the adjusting grooves. An adjusting shaft is rotatably connected to the adjusting slider. A sector-shaped baffle and two symmetrically arranged adjusting gears are fixedly connected to the adjusting shaft. The adjusting gears are located in the adjusting grooves, and the sector-shaped baffle is located between the two adjusting gears. An adjusting rack is fixedly connected in the adjusting grooves. The adjusting rack meshes with the adjusting gears. An adjusting cylinder is fixedly connected in the adjusting grooves. The output end of the adjusting cylinder is fixedly connected to the adjusting slider.

[0018] A monitoring system, comprising:

[0019] The multi-source data acquisition module is used to acquire the contact pressure of the T-shaped compensation ring seat sealing end face in each monitoring cycle based on the contact pressure sensor evenly distributed on the sealing end face of the T-shaped compensation ring seat; to acquire the steam temperature entering the self-heating gate and the steam temperature flowing out of the self-heating gate in each monitoring cycle based on the temperature sensor; to acquire the current amplitude and direction of the current input to the annular electromagnet in each monitoring cycle based on the current sensor; to acquire the extension length of the actuator and the valve opening and closing status in each monitoring cycle based on the displacement sensor; and to acquire the pressure difference before and after the self-heating gate in each monitoring cycle based on the pressure sensor.

[0020] The current state calculation module is used to calculate the contact non-uniformity coefficient between the T-shaped compensation ring seat and the self-heating gate plate in the current monitoring cycle based on the detection value of the contact pressure sensor in each monitoring cycle. Based on the detection value of the contact pressure sensor in each monitoring cycle, the steam temperature entering the self-heating gate plate and the steam temperature flowing out of the self-heating gate plate, and the current amplitude of the input annular electromagnet, it calculates the comprehensive sealing performance index between the T-shaped compensation ring seat and the self-heating gate plate in the current monitoring cycle.

[0021] The state sequence generation module is used to arrange the multi-source data, the contact non-uniformity coefficient between the T-shaped compensation ring seat and the self-heating gate, and the comprehensive sealing performance index between the T-shaped compensation ring seat and the self-heating gate according to a fixed data structure order to form the state vector corresponding to each monitoring cycle.

[0022] The state vector prediction module is used to predict the state vector corresponding to the next monitoring period based on the time series prediction model, taking the first N state vectors of the current monitoring period as input;

[0023] The diagnostic decision output module is used to input the predicted state vector corresponding to the next monitoring cycle into the trained neural network gate valve risk diagnosis model, and output the risk type and response strategy of the gate valve in the next monitoring cycle.

[0024] The maintenance strategy execution module is used to generate specific control instructions based on the output risk type and response strategy and send them to the corresponding actuators. The control instructions include: controlling the steam source to adjust the steam flow or temperature entering the self-heating gate, adjusting the current and direction of the input annular electromagnet, controlling the start and stop of the rotary drive motor, and sending extension and retraction commands to the actuators.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) By setting a movable sealing seat and combining it with a compensating elastic element, the present invention enables the T-shaped compensating ring seat to automatically compensate for the sealing gap caused by abrasive wear along the axial direction, thereby overcoming the sealing failure problem caused by the lack of compensation capability of the traditional fixed sealing seat; at the same time, the introduction of the self-heating gate can continuously heat and soften the tar adhering to the gate surface, making it easy to peel off. Combined with the continuous pressing action of the T-shaped compensating ring seat during the gate movement, dynamic scraping and cleaning of the gate surface is realized, effectively preventing the gate jamming caused by tar condensation and caking; in addition, by setting an annular guide groove and a connecting hole, and connecting it with the impurity collection component at the bottom, the scraped tar and particulate impurities can be collected and discharged from the valve body in an orderly manner, avoiding the secondary sealing problem caused by the accumulation of impurities at the bottom of the valve body; the present invention integrates three major functions: self-compensation, self-cleaning and impurity collection, which significantly improves the sealing reliability, operation stability and service life of the valve in tar-containing and particulate gas media.

[0027] (2) The design of the rotating grinding component of the present invention not only realizes active cleaning, but also makes the wear of the sealing pair evenly distributed on the entire circumferential sealing surface of the T-shaped compensation ring seat by periodically changing the circumferential contact position between the T-shaped compensation ring seat and the self-heating gate, thereby fundamentally avoiding local groove wear and significantly extending the overall service life of the sealing pair.

[0028] (3) This invention achieves online, real-time quantitative assessment and short-term trend prediction of the health status of the sealing pair through multi-sensor fusion and artificial intelligence algorithm. It can proactively trigger targeted maintenance actions before micro-leakage occurs, before wear intensifies, and before large-area tar caking, such as adjusting the heating degree, enhancing sealing displacement compensation, and starting the rotating wear equalization component, thereby eliminating the fault in the bud. This not only greatly improves the reliability, safety and service life of the valve under harsh working conditions, but also reduces the high safety risks and production costs caused by unplanned maintenance.

[0029] (4) When the opening of the eddy current mitigation component of the present invention is small and the gas medium pressure is high, the adjusting slider is at the right limit position of the adjusting groove. At this time, the fan-shaped baffle is in a vertical position, which disperses and cuts the eddy current to the maximum extent. When the eddy current is fully open, the adjusting slider is at the left limit position of the adjusting groove. At this time, the fan-shaped baffle is in a horizontal state, which reduces the flow resistance of the gas medium to the maximum extent. As the eddy current increases, the adjusting cylinder drives the adjusting slider to move to the right, so that the action position of the fan-shaped baffle can always track and penetrate into the area with the strongest eddy current energy. At the same time, the rotation of the fan-shaped baffle is also a process of maximizing the effective flow-facing area as the eddy current energy increases, thereby effectively cutting, blocking and dispersing the rotating eddy current clusters from the front, converting the rotational kinetic energy of the large vortex into more small-scale turbulence, thereby quickly dissipating its energy. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of the knife-type gas gate valve of the present invention;

[0032] Figure 2 Cross-sectional view of the knife-type gas gate valve of the present invention. Figure 1 ;

[0033] Figure 3 Cross-sectional view of the knife-type gas gate valve of the present invention. Figure 2 ;

[0034] Figure 4 For the present invention Figure 3A magnified view of part A;

[0035] Figure 5 This is a schematic diagram of the self-heating gate structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the impurity collection component structure of the present invention;

[0037] Figure 7 This is a schematic diagram of the rotating grinding assembly structure of the present invention;

[0038] Figure 8 This is a schematic diagram of the eddy current mitigation component structure of the present invention.

[0039] In the diagram: 1. Valve body; 2. Self-heating gate; 3. Movable sealing seat; 4. Actuator; 5. Annular electromagnet; 6. Impurity collection assembly; 7. Scraper; 8. Lightening assembly short pipe; 10. Gate annular slot; 11. Annular guide groove; 12. Connecting hole; 13. T-shaped valve body ring; 14. T-shaped valve body annular mounting groove; 15. Compensating elastic element two; 20. Steam spiral coil; 21. Inlet connection nozzle; 22. Return connection nozzle; 23. Inlet connection short pipe; 24. Return connection short pipe; 30. Annular fixing seat; 31. T-shaped... 32. Compensating ring seat; 50. Compensating elastic element one; 60. Ring magnetic block; 61. Self-heating tar impurity collection box; 62. Screw drive motor; 63. Collection bin; 64. Air return hole; 70. Conveying screw; 71. Rotary drive motor; 72. Winding wheel one; 73. Transition wheel; 74. Winding wheel two; 75. Meshing gear; 76. Meshing toothed ring; 80. Steel wire winding; 81. Adjusting slide; 82. Adjusting shaft; 83. Adjusting gear; 84. Fan-shaped baffle; 85. Adjusting rack; 86. Adjusting cylinder. Detailed Implementation

[0040] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0041] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0042] The present invention provides the following embodiments.

[0043] Example 1

[0044] This invention provides a knife-type gas gate valve, such as... Figure 1-8 As shown, the device includes a valve body 1, a self-heating gate 2, and a movable sealing seat 3. An actuator 4 is provided on the valve body 1. The self-heating gate 2 is slidably connected to the valve body 1 through the actuator 4. The movable sealing seat 3 includes an annular fixed seat 30 and a T-shaped compensating ring seat 31. An annular slot 10 for the gate is provided in the valve body 1. The annular fixed seat 30 is installed in the annular slot 10 for the gate and is threadedly connected to the valve body 1. The T-shaped compensating ring seat 31 is slidably connected in the annular fixed seat 30. A compensating elastic element 32 is fixedly connected to the end face of the valve body 1 located in the annular fixed seat 30. The end of the compensating elastic element 32 away from the valve body 1 abuts against the T-shaped compensating ring seat 31. The T-shaped compensating ring seat 31 is used to cooperate with the front of the self-heating gate 2.

[0045] The valve body 1 is provided with an annular guide groove 11, which communicates with the gate annular slot 10. A connecting hole 12 is provided at the bottom of the annular guide groove 11, and the end of the connecting hole 12 away from the annular guide groove 11 is connected to the impurity collection component 6.

[0046] It also includes a vortex mitigation component, which is installed in the mitigation component short tube 8 bolted to the output end of the valve body 1. The vortex mitigation component includes a fan-shaped baffle 84, which can slide along the axial direction of the mitigation component short tube 8 and rotate around its own axis to dynamically adapt to medium vortices of different intensities and reduce the damage to the gate valve caused by the medium vortex when the gate valve is not fully open.

[0047] In this embodiment, the actuator 4 can be either a pneumatic actuator or an electro-hydraulic actuator.

[0048] The working principle and beneficial effects of the above technical solution are as follows: During operation, the self-heating gate 2 is moved up and down by the up and down extension of the working end of the actuator 4 to realize the opening and closing of the gas pipeline. After long-term use, the self-heating gate 2 will experience abrasive wear. The design of the compensation elastic element 32 will ensure that the T-shaped compensation ring seat 31 always presses the self-heating gate 2 tightly to avoid sealing failure and ensure sealing effect. At the same time, the self-heating gate 2 can heat and melt the tar attached to the self-heating gate 2. With the T-shaped compensation ring seat 31 always pressing the front of the self-heating gate 2 (the front of the self-heating gate 2 has the most tar attached), the tar and other impurities attached to the surface of the self-heating gate 2 can be scraped off during the up and down movement of the self-heating gate 2. The scraped impurities fall into the annular guide groove 11 under the action of gravity. Finally, after being guided by the annular guide groove 11, they flow into the connecting hole 12 and then into the impurity collection component 6 through the connecting hole 12.

[0049] This invention overcomes the sealing failure problem caused by the lack of compensation capability in traditional fixed sealing seats by setting a movable sealing seat 3 and combining it with a compensating elastic element 32, enabling the T-shaped compensating ring seat 31 to automatically compensate for the sealing gap caused by abrasive wear along the axial direction. Simultaneously, the introduction of the self-heating gate 2 can continuously heat and soften the tar adhering to the gate surface, making it easier to peel off. Combined with the continuous pressing action of the T-shaped compensating ring seat 31 during the gate's movement, dynamic scraping and cleaning of the gate surface is achieved, effectively preventing gate jamming caused by tar condensation and caking. Furthermore, by setting an annular guide groove 11 and a connecting hole 12, and connecting it with the impurity collection assembly 6 at the bottom... The interconnection allows the scraped tar and particulate impurities to be collected and discharged from the valve body 1 in an orderly manner, avoiding secondary sealing problems caused by the accumulation of impurities at the bottom of the valve body. This invention integrates three major functions: self-compensation, self-cleaning, and impurity collection, which significantly improves the sealing reliability, operational stability, and service life of the valve in tar- and particulate gas media. The sector-shaped baffle 84 of this invention can slide along the axial direction of the short pipe 8 of the light-reducing component and rotate around its own axis. When the eddy current returns and encounters the sector-shaped baffle 84, its kinetic energy is weakened, and the eddy current is directly cut and dispersed. The position and rotation angle of the sector-shaped baffle 84 are different for media eddies of different intensities, which reduces the damage to the gate valve caused by the media eddy current when the gate valve is not fully open.

[0050] Example 2

[0051] Based on Embodiment 1, an active compensation component is also included. The active compensation component includes an annular electromagnet 5 and an annular magnetic block 50. The annular electromagnet 5 is fixedly connected to the end face of the valve body 1 located in the annular fixed seat 30. The annular magnetic block 50 is fixedly connected to the T-shaped compensation ring seat 31. The annular electromagnet 5 is electrically connected to an external active compensation controller. The external active compensation controller is used to adjust the magnitude and direction of the current input to the annular electromagnet 5, so that the annular electromagnet 5 generates a controllable magnetic force acting on the annular magnetic block 50, thereby driving the T-shaped compensation ring seat 31 to move axially along the valve body 1.

[0052] In this embodiment, the annular electromagnet 5 includes an outer housing, an annular iron core disposed inside the outer housing, and an electromagnetic coil wound on the annular iron core. The two wires of the electromagnetic coil are covered with sleeves, which are led out along the valve body 1, and the energized end of the sleeve is sealed by a miniature stuffing box.

[0053] In this embodiment, the annular magnetic block 50 is made of a high-performance sintered permanent magnet.

[0054] The working principle and beneficial effects of the above technical solution are as follows: During operation, based on the initial sealing force provided by the compensation elastic element 32, the external active compensation controller can input a controllable current into the electromagnetic coil of the annular electromagnet 5 according to the working conditions (such as detecting a micro-leakage signal, increased wear of the sealing pair, or the need for a higher sealing specific pressure). When the current passes through, the annular iron core of the annular electromagnet 5 generates a magnetic field. The magnetic field interacts with the permanent magnetic field of the annular magnetic block 50 to generate a controllable axial magnetic force. By adjusting the magnitude of the input current, the strength of the magnetic force can be linearly changed. By changing the direction of the current, the magnetic force can be switched to an attractive force or a repulsive force, thereby driving the T-shaped compensation ring seat 31 to move precisely along the axial direction.

[0055] Under normal sealing conditions, the external active compensation controller can maintain a small positive current or provide no current. When maintaining a small positive current, it provides a stable auxiliary clamping force to optimize the sealing effect. When no current is provided, the seal is maintained solely by the mechanical elasticity of the compensation elastic element 32. When the compensation elastic element 32 becomes insufficient due to long-term compression fatigue or wear, the external active compensation controller can increase the positive current, with electromagnetic force actively compensating or even completely replacing the mechanical elasticity, ensuring that the sealing pair always fits tightly and preventing leakage. In addition, when the valve is opened, a positive current can be briefly introduced, and the annular electromagnet 5 and the annular magnetic block 50 generate a slight repulsive force, which helps the T-shaped compensation ring seat 31 and the self-heating gate 2 to... The surface fits better, and the self-heating gate 2 moves upward while heating, which can soften and scrape off the tar adhering to the surface of the self-heating gate 2. During the valve closing process, that is, when the self-heating gate 2 moves downward, a reverse current can be briefly passed through. The annular electromagnet 5 and the annular magnetic block 50 generate a slight attraction, and the T-shaped compensation ring seat 31 moves away from the surface of the self-heating gate 2 until the self-heating gate 2 is closed in place and the reverse current stops. The annular magnetic block 50 returns to its position, and the T-shaped compensation ring seat 31 and the self-heating gate 2 are in a sealed state again. This minimizes the wear of the T-shaped compensation ring seat 31 on the self-heating gate 2 and improves the sealing reliability and service life of the knife-type gas gate valve under harsh working conditions.

[0056] Example 3

[0057] Based on Example 1, a steam spiral coil 20 is installed inside the self-heating gate 2. An air inlet connector 21 and an air return connector 22 are installed on the self-heating gate 2. One end of the air inlet connector 21 and the air return connector 22 are respectively connected to both ends of the steam spiral coil 20. The other end of the air inlet connector 21 and the air return connector 22 are respectively connected to the air inlet connecting pipe 23 and the air return connecting pipe 24 on the valve body 1 through a hose. The air inlet connecting pipe 23 and the air return connecting pipe 24 form a communication loop with the external steam source.

[0058] In this embodiment, the external steam source is a centralized steam supply network or an independent steam generator, which provides a stable and controllable saturated steam flow to the steam spiral coil 20.

[0059] In this embodiment, the hose is made of a heat-resistant and corrosion-resistant material.

[0060] The working principle and beneficial effects of the above technical solution are as follows: During operation, the external steam source inputs steam to the inlet nozzle 21 through the inlet connecting short pipe 23 and the hose. Then, the steam enters the steam spiral coil 20 through the inlet connecting pipe 21. The design of the steam spiral coil 20 greatly increases the steam heat exchange area and steam residence time. During the process of the high-temperature steam flowing through the steam spiral coil 20, it undergoes efficient heat exchange with the self-heating gate 2. Its latent heat is quickly released to the self-heating gate 2, thereby heating and softening the original solid or semi-solid tar deposits on the surface of the self-heating gate 2. Then, it flows from the output end of the steam spiral coil 20 into the return gas connecting nozzle 22, and then flows through the return gas connecting nozzle 22 and the hose into the return gas connecting short pipe 24. Finally, it flows back to the external steam source through the return gas connecting short pipe 24.

[0061] Example 4

[0062] Based on embodiment 1, it also includes a T-shaped valve body ring 13. A T-shaped valve body annular mounting groove 14 is provided in the end face of the valve body 1 that cooperates with the back of the self-heating gate 2. The T-shaped valve body ring 13 is axially slidably connected in the T-shaped valve body annular mounting groove 14. The T-shaped valve body annular mounting groove 14 and the T-shaped valve body ring 13 are connected by a compensating elastic element 2 15.

[0063] The working principle and beneficial effects of the above technical solution are as follows: During operation, due to the design of the compensation elastic element 15, the T-shaped valve body ring 13 can automatically compensate for displacement regardless of whether there are tar impurities or surface abrasive wear on the surface of the self-heating gate plate 2, ensuring that the T-shaped valve body ring 13 is always in contact with the surface of the self-heating gate plate 2.

[0064] Example 5

[0065] Based on Embodiment 1, the impurity collection assembly 6 includes a self-heating tar impurity collection box 60, which is threadedly connected to the bottom of the valve body 1 and communicates with the connecting hole 12. The self-heating tar impurity collection box 60 is equipped with an auger drive motor 61, and a conveying auger 64 is fixedly connected to the output end of the auger drive motor 61. The auger output end of the self-heating tar impurity collection box 60 is equipped with a collection chamber 62. The self-heating tar impurity collection box 60 is equipped with a return air hole 63, and a one-way valve is installed in the return air hole 63. The return air hole 63 communicates with the valve body 1 through a pipe.

[0066] In this embodiment, the outer wall of the self-heating tar impurity collection box 60 is wrapped with an explosion-proof electric heating tape.

[0067] The working principle and beneficial effects of the above technical solution are as follows: After melting and falling, tar and other impurities fall into the self-heating tar impurity collection box 60 after passing through the gate annular slot 10, annular guide groove 11 and connecting hole 12 in sequence. Then, the auger drive motor 61 drives the conveying auger 64 to rotate, and the tar impurities are input into the collection bin 62 for cleaning. The gas entering the self-heating tar impurity collection box 60 will return to the valve body 1 through the return gas hole 63 and pipeline.

[0068] Example 6

[0069] Based on embodiment 2, a rotary grinding assembly is also included. The rotary grinding assembly includes a rotary drive assembly and a scraper 7. The scraper 7 is bolted to the inner wall of the T-shaped compensation ring seat 31, and the working surface of the scraper 7 is in contact with the self-heating gate plate 2. The rotary drive assembly is used to drive the T-shaped compensation ring seat 31 to rotate.

[0070] The rotary drive assembly includes a rotary drive motor 70, which is fixedly connected to the outer shell of the valve body 1. A first winding wheel 71 is fixedly connected to the output end of the rotary drive motor 70. A transition wheel 72 and a second winding wheel 73 are rotatably connected to the outer shell of the valve body 1. A steel wire winding 76 is wound on the first winding wheel 71. The steel wire winding 76 is output from the first winding wheel 71, passes over the transition wheel 72, and winds onto the second winding wheel 73. A return torsion spring is provided on the rotating shaft of the second winding wheel 73. One end of the return torsion spring is fixedly connected to the rotating shaft of the second winding wheel 73, and the other end is fixedly connected to the inner wall of the valve body 1. A meshing gear 74 is coaxially connected to the second winding wheel 73. A meshing toothed ring 75 is circumferentially fixedly connected to the T-shaped compensation ring seat 31. The meshing gear 74 and the meshing toothed ring 75 mesh with each other.

[0071] The working principle and beneficial effects of the above technical solution are as follows: During operation, the self-heating gate 2 is slightly raised, causing the bottom of the self-heating gate 2 to disengage from the gate annular slot 10. The rotary drive motor 70 is started according to the control command, driving the T-shaped compensation ring seat 31 and its scraper 7 to perform a rotary cleaning operation. The cleaned tar and impurities fall into the impurity collection assembly 6 through the gate annular slot 10. Depending on the transmission state of the wire winding 76, the specific situation is divided into the following two cases:

[0072] Scenario 1: The steel wire winding 76 is tightened, driving the T-shaped compensating ring seat 31 to rotate in the forward direction:

[0073] When scraping and cleaning are required, the rotary drive motor 70 starts in the tightening direction, driving the first winding wheel 71 to rotate. The first winding wheel 71 rotates and retracts the wire winding 76. After the wire winding 76 is guided by the transition wheel 72, it generates tension and pulls the second winding wheel 73 to overcome the resistance of the return torsion spring on its shaft and rotate in the driving direction. The rotation of the second winding wheel 73 drives the meshing gear 74, which is fixed on the same axis as it, to rotate synchronously. The meshing gear 74 meshes with the meshing tooth ring 75, which is fixedly installed on the circumferential direction of the T-shaped compensation ring seat 31, to accurately transmit the rotational motion, thereby driving the entire T-shaped compensation ring seat 31 to rotate in the positive direction around the axis of the valve body 1. At this time, the scraper 7, which is fixed on the inner wall of the T-shaped compensation ring seat 31, rotates accordingly and performs circumferential scraping on the surface of the self-heating gate plate 2 that is in contact with it. At the same time, the return torsion spring is tightened and stores elastic potential energy.

[0074] Scenario 2: The wire winding 76 is released, and the T-shaped compensation ring seat 31 is reset under the action of the reset torsion spring;

[0075] When the cleaning operation is completed or when a reset is required, the rotary drive motor 70 reverses, and at the same time, the reset torsion spring resets the wire winding 76 that was wound on the winding wheel 73 during the forward rotation and retracts it back to the winding wheel 71. As the winding wheel 73 rotates in the reverse direction, it drives the T-shaped compensation ring seat 31 to rotate in the reverse direction to the initial position through the meshing of the meshing gear 74 and the meshing tooth ring 75.

[0076] The design of the rotating wear equalization component not only achieves active cleaning, but also periodically changes the circumferential contact position between the T-shaped compensation ring seat 31 and the self-heating gate 2, so that the wear of the sealing pair is evenly distributed on the entire circumferential sealing surface of the T-shaped compensation ring seat 31. This fundamentally avoids localized grooved wear (such as the wear degree of the upper half circle of the T-shaped compensation ring seat 31 being much higher than that of the lower half circle), and significantly extends the overall service life of the sealing pair.

[0077] Example 7

[0078] Based on Embodiment 1, the eddy current mitigation component further includes an adjusting slider 81. The inner wall of the short tube 8 of the mitigation component has two symmetrically arranged adjusting grooves 80. The adjusting slider 81 is slidably connected in the adjusting grooves 80. An adjusting shaft 82 is rotatably connected to the adjusting slider 81. Two symmetrically arranged adjusting gears 83 and a sector-shaped baffle 84 are fixedly connected to the adjusting shaft 82. The adjusting gears 83 are located in the adjusting grooves 80, and the sector-shaped baffle 84 is located between the two adjusting gears 83. An adjusting rack 85 is fixedly connected in the adjusting grooves 80. The adjusting rack 85 meshes with the adjusting gears 83. An adjusting cylinder 86 is fixedly connected in the adjusting grooves 80. The output end of the adjusting cylinder 86 is fixedly connected to the adjusting slider 81.

[0079] The working principle and beneficial effects of the above technical solution are as follows: During the opening process of the knife gate valve or when it is not fully opened, that is, when the self-heating gate 2 is lifted from the valve body 1 to form a narrow gap, the gas medium flowing through this gap at high speed will undergo flow separation. After the gas medium leaves the self-heating gate 2, due to local pressure changes and velocity differences, it will form irregular, rotating vortices, that is, eddies. Essentially, it is a fluid dynamic instability phenomenon caused by the redistribution of momentum and pressure field when the fluid enters the relatively open valve cavity and downstream pipeline from the constrained gap. This eddy phenomenon will trigger a series of chain negative effects: such as the unstable periodic eddies will generate alternating forces on the valve body 1, the self-heating gate 2 and the downstream pipeline, causing mechanical vibration; the high-speed rotating eddies will carry hard particles in the medium, continuously eroding the sealing surface of the self-heating gate 2 like a grinding wheel, accelerating the wear of the sealing pair; the eddies will generate high-frequency airflow noise; at the same time, the process of eddy formation and maintenance will waste fluid pressure energy, resulting in additional pressure loss and reducing system energy efficiency.

[0080] When the gate valve is closed, the adjusting slider 81 is at the left limit position of the adjusting groove 80 under the action of the adjusting cylinder 86. At this time, the sector-shaped baffle 84 is in a horizontal state. Figure 3 The central sector-shaped baffle 84 is in a vertical position, and the orientation of the sector-shaped baffle 84 at its left extreme position is... Figure 3 When the central sector-shaped baffle plate 84 rotates 90 degrees counterclockwise, as the gate valve gradually opens, it reduces the eddy current phenomenon that occurs in the medium inside the short pipe 8 of the mitigation component under pressure. At this time, the regulating cylinder 86 shortens, causing the regulating slider 81 to slide to the right. During the sliding of the regulating slider 81 to the right, the regulating gear 83 and the regulating rack 85 mesh with each other, causing the regulating shaft 82 to rotate clockwise. This causes the sector-shaped baffle plate 84 to gradually adjust from a horizontal state to a vertical state, so that the kinetic energy of the eddy current backflow is weakened when it encounters the sector-shaped baffle plate 84, and the eddy current is directly cut and dispersed, thereby greatly reducing the eddy current energy and its negative effects.

[0081] In this invention, when the opening is small and the gas medium pressure is high, the adjusting slider 81 is at the right limit position of the adjusting groove 80. At this time, the fan-shaped baffle 84 is in a vertical position, which disperses and cuts the vortex to the greatest extent. When the opening is fully open, the adjusting slider 81 is at the left limit position of the adjusting groove 80. At this time, the fan-shaped baffle 84 is in a horizontal state, which minimizes the flow resistance of the gas medium. As the vortex increases, the adjusting cylinder 86 drives the adjusting slider 81 to gradually move to the right, so that the action position of the fan-shaped baffle 84 can always track and penetrate into the area with the strongest vortex energy. At the same time, the rotation of the fan-shaped baffle 84 is also a process of maximizing the effective flow-facing area as the vortex energy increases, thereby most effectively cutting, blocking and dispersing the rotating vortex cluster from the front, converting the rotational kinetic energy of the large vortex into more small-scale turbulence, thereby quickly dissipating its energy.

[0082] Example 8

[0083] This invention provides a monitoring system, comprising:

[0084] The multi-source data acquisition module is used to acquire the contact pressure of the sealing end face of the T-shaped compensation ring seat 31 in each monitoring cycle based on the contact pressure sensor uniformly distributed on the sealing end face of the T-shaped compensation ring seat 31, the steam temperature entering the self-heating gate 2 and the steam temperature flowing out of the self-heating gate 2 in each monitoring cycle based on the temperature sensor, the current amplitude and direction of the current input to the annular electromagnet 5 in each monitoring cycle based on the current sensor, the extension length of the actuator 4 and the valve opening and closing status in each monitoring cycle based on the displacement sensor, and the pressure difference before and after the self-heating gate 2 in each monitoring cycle based on the pressure sensor.

[0085] The current state calculation module is used to calculate the contact non-uniformity coefficient between the T-shaped compensation ring seat 31 and the self-heating gate 2 in the current monitoring cycle based on the detection value of the contact pressure sensor in each monitoring cycle. Based on the detection value of the contact pressure sensor in each monitoring cycle, the steam temperature entering the self-heating gate 2 and the steam temperature flowing out of the self-heating gate 2, and the current amplitude of the input annular electromagnet 5, it calculates the comprehensive sealing performance index between the T-shaped compensation ring seat 31 and the self-heating gate 2 in the current monitoring cycle.

[0086] The state sequence generation module is used to arrange the multi-source data, the contact non-uniformity coefficient between the T-shaped compensation ring seat 31 and the self-heating gate 2, and the comprehensive sealing performance index between the T-shaped compensation ring seat 31 and the self-heating gate 2 corresponding to each monitoring cycle in a fixed data structure order to form a state vector corresponding to each detection cycle.

[0087] The state vector prediction module is used to predict the state vector corresponding to the next monitoring period based on the time series prediction model, taking the first N state vectors of the current monitoring period as input;

[0088] The diagnostic decision output module is used to input the predicted state vector corresponding to the next monitoring cycle into the trained neural network gate valve risk diagnosis model, and output the risk type and response strategy of the gate valve in the next monitoring cycle.

[0089] The maintenance strategy execution module is used to generate specific control instructions based on the output risk type and response strategy and send them to the corresponding actuators. The control instructions include: controlling the steam source to adjust the steam flow or temperature entering the self-heating gate 2, adjusting the current and direction of the input annular electromagnet 5, controlling the start and stop of the rotary drive motor 70, and sending extension and retraction commands to the actuator 4.

[0090] In this embodiment, the direction of the current input to the ring electromagnet 5 is defined as follows: +1 indicates that the current direction is to make the ring electromagnet 5 generate an axial attractive force on the ring magnetic block 50, -1 indicates that an axial repulsive force is generated, and 0 indicates that no force is generated when no current is applied.

[0091] In this embodiment, the valve opening and closing states are defined as follows: 0 indicates that the valve is in a fully closed and locked state, 1 indicates that the valve is in a fully open state, 0.5 indicates that it is in the middle stroke state, -1 indicates that it is closing, and +1 indicates that it is opening.

[0092] In this embodiment, the multi-source data corresponding to each monitoring cycle includes: the steam temperature entering the self-heating gate 2, the steam temperature exiting the self-heating gate 2, the current amplitude of the input annular electromagnet 5, the current direction of the input annular electromagnet 5, the extension length of the actuator 4, the valve opening and closing status, and the pressure difference before and after the self-heating gate 2 (e.g., ...). Figure 3 As shown, the left side of the self-heating gate 2 is the front, and the right side is the back.

[0093] In this embodiment, the time series prediction model is a prediction model based on a recurrent neural network, specifically constructed using a long short-term memory network or a gated recurrent unit.

[0094] The model is trained in the following way: N consecutive state vectors arranged in chronological order in the historical monitoring cycle are used as input features, and the state vector of the next actual monitoring cycle is used as the training label. The model is trained in a supervised manner using a large amount of historical data, so that the model learns the mapping pattern from the historical state sequence to the future state, and can predict the state vector of the next cycle based on the current and historical state vectors.

[0095] In this embodiment, the trained neural network gate valve risk diagnosis model is a classification model obtained by supervised learning training, with the state vectors corresponding to a large number of historical monitoring cycles as input and the fault or risk types and manual response strategies labeled by the expert system or historical maintenance records and corresponding to the actual occurrence of the fault or risk types in subsequent periods of the state vector as output labels.

[0096] In this embodiment, the risk types and corresponding strategies include:

[0097] (1) Risk type: Uneven wear risk of sealing pair; Countermeasure: Automatically plan and start the rotating wear equalization component to drive the T-shaped compensation ring seat 31 to rotate at a specific angle to deal with the uneven wear risk of sealing pair;

[0098] (2) Risk type: risk of tar adhesion and condensation; Countermeasures: increase the steam temperature or flow rate entering the self-heating gate 2, and actively adjust the current direction of the annular electromagnet 5 to the repulsive force mode when the valve is activated next time to assist in cleaning and scraping.

[0099] (3) Risk type: Insufficient active compensation force; Countermeasure: Under the premise of ensuring safety, increase the current amplitude of the input ring electromagnet 5 in a stepwise manner to enhance the electromagnetic clamping force on the T-shaped compensation ring seat 31.

[0100] In this embodiment, based on the detection value of the contact pressure sensor in each monitoring cycle, the formula for calculating the contact non-uniformity coefficient between the T-shaped compensation ring seat 31 and the self-heating gate 2 in the current monitoring cycle is as follows:

[0101] ;in, The contact non-uniformity coefficient between the T-shaped compensation ring seat 31 and the self-heating gate 2 in the k-th monitoring cycle is given by m, where m is the total number of contact pressure sensors. This represents the detection value of the i-th contact pressure sensor during the k-th monitoring cycle. To compensate for the pressure value.

[0102] In this embodiment, based on the detection value of the contact pressure sensor in each monitoring cycle, the steam temperature entering the self-heating gate 2 and the steam temperature exiting the self-heating gate 2, and the current amplitude of the input annular electromagnet 5, the formula for calculating the comprehensive sealing performance index between the T-shaped compensation ring seat 31 and the self-heating gate 2 in the current monitoring cycle is as follows:

[0103] ;in, The comprehensive sealing performance index between the T-shaped compensation ring seat 31 and the self-heating gate 2 in the kth monitoring cycle is given. The basic sealing efficiency coefficient of the gate valve sealing pair material in the kth monitoring cycle. The steam temperature entering the self-heating gate 2 during the kth monitoring cycle is... The temperature of the steam flowing out of the self-heating gate 2 during the kth monitoring cycle is... The design sealing pressure of the gate valve, Let be the electromagnetic compensation gain coefficient for the k-th monitoring cycle. The current amplitude of the ring electromagnet 5 is input for the kth monitoring cycle.

[0104] In this embodiment, the contact non-uniformity coefficient is a dimensionless scalar; the closer its value is to 0, the more uniform the contact pressure distribution is at all points on the sealing end face; the larger its value is, the more uneven the pressure distribution is, and there is a risk of local contact being too tight or too loose, which may lead to uneven wear or leakage.

[0105] In this embodiment, the comprehensive sealing performance index is a dimensionless scalar and a core indicator used to assess the health status of the sealing pair. The closer its value is to 1, the better the matching degree between the sealing capacity and the working condition requirements. A value significantly greater than 1 indicates excessive sealing force, which may accelerate wear. A value less than 1 indicates insufficient sealing force and the risk of leakage.

[0106] In this embodiment, the compensation pressure value It is a small positive number used to avoid the case where the denominator is 0.

[0107] In this embodiment, the gate valve sealing pair consists of a self-heating gate plate 2 and a T-shaped compensating ring seat 31.

[0108] In this embodiment, the basic sealing efficiency coefficient of the gate valve sealing pair material It is a temperature-related, dimensionless variable that represents the minimum theoretical sealing pressure required per unit pressure difference for the sealing pair material at a specific temperature. It can be obtained by looking up the material temperature-efficiency coefficient mapping table.

[0109] The material temperature-efficiency coefficient mapping table is a database pre-calibrated through material experiments and simulations. It takes the equivalent average temperature of the sealing pair material as input and the basic sealing efficiency coefficient as output. The equivalent average temperature of the sealing pair material is replaced by the average temperature of the steam entering the self-heating gate 2 and the steam flowing out of the self-heating gate 2. By inputting the average temperature of the steam entering the self-heating gate 2 and the steam flowing out of the self-heating gate 2 into the material temperature-efficiency coefficient mapping table, the corresponding basic sealing efficiency coefficient can be obtained.

[0110] Specifically, the material temperature-efficiency coefficient mapping table is obtained by conducting systematic isothermal sealing performance tests on sealing materials such as the self-heating gate 2, determining the minimum sealing pressure required to achieve the specified sealing level at various typical temperature points (the mechanical properties of sealing materials, such as elastic modulus, hardness, and creep rate, will change at different temperatures, thus affecting the minimum pressure required to achieve the same sealing effect, i.e., the sealing pressure). After dimensionless processing and curve fitting, the data is pre-calibrated and stored in the database of the gate valve monitoring and maintenance module.

[0111] In this embodiment, the electromagnetic compensation gain coefficient It is a dimensionless scalar that represents the amplification factor of the electromagnetic force generated by the annular electromagnet 5 to the total sealing force under the action of current. It is obtained by comparing the current amplitude input to the annular electromagnet 5 in the kth monitoring cycle with the current-compensation gain mapping table. The current-compensation gain mapping table is established by conducting offline calibration experiments on the electromagnetic actuator composed of the annular electromagnet 5 and the annular magnetic block 50. The electromagnetic compensation gain coefficient quantitatively describes the contribution of the electromagnetic force generated by the annular electromagnet 5 to the total sealing force.

[0112] The working principle and beneficial effects of the above technical solution are as follows: This invention achieves online, real-time quantitative assessment and short-term trend prediction of the health status of the sealing pair through multi-sensor fusion and artificial intelligence algorithms. It can proactively trigger targeted maintenance actions before micro-leakage occurs, before wear intensifies, and before large-area tar caking occurs, such as adjusting the heating degree, enhancing sealing displacement compensation, and starting the rotating wear equalization component, thereby eliminating the fault in its infancy. This not only greatly improves the operational reliability, safety and service life of the valve under harsh operating conditions, but also reduces the high safety risks and production costs caused by unplanned maintenance.

[0113] This invention abandons the traditional method of relying on human experience and qualitative judgment of valve status. By introducing the contact non-uniformity coefficient and comprehensive sealing efficiency index between the T-shaped compensation ring seat 31 and the self-heating gate plate 2 in the current monitoring cycle, it realizes accurate, objective and real-time digital measurement of the health status of the gas gate valve sealing system. This provides high-quality and highly interpretable feature input for time series prediction models, greatly improving the accuracy and reliability of artificial intelligence diagnosis.

[0114] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A knife-type gas gate valve, characterized in that: The valve body (1), self-heating gate (2), movable sealing seat (3), and eddy current mitigation component are included. The valve body (1) is provided with an actuator (4). The self-heating gate (2) is slidably connected to the valve body (1) through the actuator (4). The movable sealing seat (3) includes an annular fixed seat (30) and a T-shaped compensating ring seat (31). The valve body (1) is provided with a gate annular slot (10). The annular fixed seat (30) is installed in the gate annular slot (10) and threadedly connected to the valve body (1). The T-shaped compensating ring seat (31) is slidably connected in the annular fixed seat (30). The end face of the valve body (1) located in the annular fixed seat (30) is fixedly connected with a compensating elastic element (32). The end of the compensating elastic element (32) away from the valve body (1) abuts against the T-shaped compensating ring seat (31). The T-shaped compensating ring seat (31) is used to cooperate with the front of the self-heating gate (2). The valve body (1) is provided with an annular guide groove (11), which is connected to the gate annular slot (10). A connecting hole (12) is provided at the bottom of the annular guide groove (11), and the end of the connecting hole (12) away from the annular guide groove (11) is connected to the impurity collection component (6). The eddy current mitigation component is installed in the mitigation component short tube (8) which is bolted to the output end of the valve body (1). The eddy current mitigation component includes a fan-shaped baffle (84). The fan-shaped baffle (84) can slide along the axial direction of the mitigation component short tube (8) and rotate around its own axis to dynamically adapt to medium eddies of different intensities and reduce the damage of medium eddies to the gate valve when the gate valve is not fully open.

2. The knife-type gas gate valve according to claim 1, characterized in that: It also includes an active compensation component, which includes an annular electromagnet (5) and an annular magnetic block (50). The annular electromagnet (5) is fixedly connected to the end face of the valve body (1) located in the annular fixed seat (30). The annular magnetic block (50) is fixedly connected to the T-shaped compensation ring seat (31). The annular electromagnet (5) is electrically connected to an external active compensation controller. The external active compensation controller is used to adjust the magnitude and direction of the current input to the annular electromagnet (5) so that the annular electromagnet (5) generates a controllable magnetic force acting on the annular magnetic block (50) to drive the T-shaped compensation ring seat (31) to move axially along the valve body (1).

3. A knife-type gas gate valve according to claim 1, characterized in that: The self-heating gate (2) is equipped with a steam spiral coil (20). The self-heating gate (2) is equipped with an air inlet connector (21) and a return air connector (22). One end of the air inlet connector (21) and the return air connector (22) are connected to both ends of the steam spiral coil (20), respectively. The other end of the air inlet connector (21) and the return air connector (22) are connected to the air inlet connecting pipe (23) and the return air connecting pipe (24) on the valve body (1) through a hose, respectively. The air inlet connecting pipe (23) and the return air connecting pipe (24) form a connection loop with the external steam source.

4. A knife-type gas gate valve according to claim 1, characterized in that: It also includes a T-shaped valve body ring (13), and a T-shaped valve body annular mounting groove (14) is provided in the end face of the valve body (1) that cooperates with the back of the self-heating gate (2). The T-shaped valve body ring (13) is axially slidably connected in the T-shaped valve body annular mounting groove (14), and the T-shaped valve body annular mounting groove (14) and the T-shaped valve body ring (13) are connected by a compensating elastic element two (15).

5. A knife-type gas gate valve according to claim 1, characterized in that: The impurity collection assembly (6) includes a self-heating tar impurity collection box (60), which is threaded to the bottom of the valve body (1) and communicates with the connecting hole (12). The self-heating tar impurity collection box (60) is equipped with an auger drive motor (61), and the output end of the auger drive motor (61) is fixedly connected to a conveying auger (64). The auger output end of the self-heating tar impurity collection box (60) is equipped with a collection chamber (62). The self-heating tar impurity collection box (60) is equipped with a return air hole (63), and a one-way valve is provided in the return air hole (63). The return air hole (63) is connected to the valve body (1) through a pipe.

6. A knife-type gas gate valve according to claim 2, characterized in that: It also includes a rotary grinding assembly, which includes a rotary drive assembly and a scraper (7). The scraper (7) is bolted to the inner wall of the T-shaped compensation ring seat (31), and the working surface of the scraper (7) is in contact with the self-heating gate (2). The rotary drive assembly is used to drive the T-shaped compensation ring seat (31) to rotate. The rotary drive assembly includes a rotary drive motor (70), which is fixedly connected to the outer shell of the valve body (1). A first winding wheel (71) is fixedly connected to the output end of the rotary drive motor (70). A transition wheel (72) and a second winding wheel (73) are rotatably connected to the outer shell of the valve body (1). A steel wire winding (76) is wound on the first winding wheel (71). The steel wire winding (76) is output from the first winding wheel (71) and passes over the transition wheel. (72) is wound on the second winding wheel (73). A return torsion spring is provided on the shaft of the second winding wheel (73). One end of the return torsion spring is fixedly connected to the shaft of the second winding wheel (73), and the other end is fixedly connected to the inner wall of the valve body (1). A meshing gear (74) is coaxially connected on the second winding wheel (73). A meshing toothed ring (75) is circumferentially fixedly connected to the T-shaped compensation ring seat (31). The meshing gear (74) and the meshing toothed ring (75) mesh with each other.

7. A knife-type gas gate valve according to claim 1, characterized in that: The eddy current mitigation component also includes an adjusting slider (81). The inner wall of the short tube (8) of the mitigation component is provided with two symmetrically arranged adjusting grooves (80). The adjusting slider (81) is slidably connected in the adjusting grooves (80). An adjusting shaft (82) is rotatably connected to the adjusting slider (81). A fan-shaped baffle (84) and two symmetrically arranged adjusting gears (83) are fixedly connected to the adjusting shaft (82). The adjusting gears (83) are located in the adjusting grooves (80), and the fan-shaped baffle (84) is located between the two adjusting gears (83). An adjusting rack (85) is fixedly connected in the adjusting grooves (80). The adjusting rack (85) meshes with the adjusting gears (83). An adjusting cylinder (86) is fixedly connected in the adjusting grooves (80). The output end of the adjusting cylinder (86) is fixedly connected to the adjusting slider (81).

8. A monitoring system for monitoring a knife-type gas gate valve as described in any one of claims 1-7, characterized in that: include: The multi-source data acquisition module is used to acquire the contact pressure of the sealing end face of the T-shaped compensation ring seat (31) in each monitoring cycle based on the contact pressure sensor uniformly distributed on the sealing end face of the T-shaped compensation ring seat (31), the steam temperature entering the self-heating gate (2) and the steam temperature flowing out of the self-heating gate (2) in each monitoring cycle based on the temperature sensor, the current amplitude and direction of the input ring electromagnet (5) in each monitoring cycle based on the current sensor, the extension length of the actuator (4) and the valve opening and closing status in each monitoring cycle based on the displacement sensor, and the pressure difference before and after the self-heating gate (2) in each monitoring cycle based on the pressure sensor. The current state calculation module is used to calculate the contact non-uniformity coefficient between the T-shaped compensation ring seat (31) and the self-heating gate (2) in the current monitoring cycle based on the detection value of the contact pressure sensor in each monitoring cycle. Based on the detection value of the contact pressure sensor in each monitoring cycle, the steam temperature entering the self-heating gate (2) and the steam temperature flowing out of the self-heating gate (2), and the current amplitude of the input ring electromagnet (5), the module calculates the comprehensive sealing performance index between the T-shaped compensation ring seat (31) and the self-heating gate (2) in the current monitoring cycle. The state sequence generation module is used to arrange the multi-source data corresponding to each monitoring cycle, the contact non-uniformity coefficient between the T-shaped compensation ring seat (31) and the self-heating gate (2), and the comprehensive sealing performance index between the T-shaped compensation ring seat (31) and the self-heating gate (2) in a fixed data structure order to form the state vector corresponding to each detection cycle. The state vector prediction module is used to predict the state vector corresponding to the next monitoring period based on the time series prediction model, taking the first N state vectors of the current monitoring period as input; The diagnostic decision output module is used to input the predicted state vector corresponding to the next monitoring cycle into the trained neural network gate valve risk diagnosis model, and output the risk type and response strategy of the gate valve in the next monitoring cycle. The maintenance strategy execution module is used to generate specific control instructions and send them to the corresponding actuators based on the output risk type and response strategy. The control instructions include: controlling the steam source to adjust the steam flow or temperature entering the self-heating gate (2), adjusting the current and direction of the input annular electromagnet (5), controlling the start and stop of the rotary drive motor (70), and sending extension and retraction instructions to the actuator (4).

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