Gate valve, method and application

Abstract

The invention belongs to the technical field of metallurgical engineering equipment, and particularly relates to a gate valve, a method and application. The device comprises a supporting frame, an upper cover flange, a lower cover flange, a flashboard, a flashboard pull rod, a multi-layer sealing structure and a steam blowing mechanism. The leakage rate of the valve is remarkably reduced by more than 80% compared with that of a common gate valve, and environmental pollution is effectively reduced. Through the positive pressure blowing function of the steam blowing mechanism, leakage of water vapor, dust and coal gas is effectively prevented, the operation environment is greatly improved, and the operation safety is improved. The multi-layer sealing structure is matched with a steam blowing system, so that the sealing performance is remarkably improved, the system failure rate is reduced, and stable operation and productivity of a carbonization system are ensured. By adopting the high-temperature-resistant and corrosion-resistant material and the optimized structural design, the service life of the valve is prolonged by 2-3 times, and the maintenance cost is reduced. The device can be adapted to internal heating type vertical carbonization furnaces with different specifications, and has a good industrial application prospect.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical engineering equipment technology, specifically relating to a slide gate valve, its method, and its application. Background Technology

[0002] In the semi-coke production process, the internally heated vertical carbonization furnace is a crucial piece of equipment, and the reliability of its coke discharge system directly affects the stability of the entire production process. Currently, the semi-coke industry widely adopts dry quenching technology, which effectively reduces the moisture content of coke and improves product quality. However, during the quenching process, a certain amount of water vapor and dust are generated in the sealed chamber, and a small amount of coal gas is also trapped between the coke particles. This poses a severe challenge to the valve sealing control of the coke discharge system.

[0003] Existing gate valve technology has significant shortcomings in handling the complex operating conditions of semi-coke quenching processes. First, the sealing structure of ordinary gate valves cannot effectively prevent the leakage of moisture, dust, and coal gas, leading to large leakage volumes and severe environmental pollution. Second, due to poor sealing performance and harsh operating environments, it not only affects the health and safety of workers but may also exacerbate equipment corrosion. Third, although some companies have attempted to combine gate valves with rotary valves, this combination still does not fundamentally solve the leakage problem; while increasing system complexity, reliability has not been significantly improved. Finally, a failure in the coke discharge system will severely impact the normal operation and production capacity of the entire carbonization system, causing significant economic losses to the company. Summary of the Invention

[0004] This invention provides a slide gate valve, method, and application. Its purpose is to provide a device and method that can effectively prevent the leakage of water vapor, dust, and gas, especially when water or steam is sprayed during the coking process to quench the coke, which causes serious environmental pollution and harsh operating environment due to water vapor and dust generated in the sealed chamber and a small amount of coal gas entrained in the coke.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A gate valve includes a support frame, an upper cover flange, a lower cover flange, a gate, a gate rod, a multi-layer sealing structure, and a steam purging mechanism. The upper and lower cover flanges are symmetrically and sealingly connected to the upper and lower parts of the support frame. The multi-layer sealing structure is vertically connected between the upper and lower cover flanges and located in the middle of the upper and lower cover flanges. The gate is horizontally positioned in the middle between the upper and lower cover flanges, with one end of the gate vertically passing through the multi-layer sealing structure and detachably connected to one end of the horizontally positioned gate rod. The other end of the gate rod extends to the outside of one side of the support frame. A pressure ring is connected to the connection end between the gate and the gate rod. A steel pressure sleeve is connected to the connection point between the gate rod and the support frame. The steam purging mechanism is connected to the inside of the other side of the support frame, and a steam inlet is provided on the support frame at the connection point. The gate rod is connected to an external transmission mechanism.

[0006] It also includes inserts; two inserts are horizontally arranged; one end of each insert is placed inside the support frame and is detachably connected to both sides of the other end of the gate; the other end of each insert extends outside the support frame; the inserts and the steam purging mechanism are placed on the same side inside the support frame.

[0007] It also includes a strip cover; the strip cover is connected to the support frame and is located on the side where the strip extends out of the support frame; the strip portion placed outside the support frame moves into the strip cover after being moved.

[0008] The support frame includes at least a front crossbeam, a rear crossbeam, and side beams; two side beams are provided, and the two side beams are connected between the front crossbeam and the rear crossbeam to form a complete frame structure; the gate pull rod passes horizontally through the center position of the rear crossbeam; the steam purging mechanism is connected to the center position inside the front crossbeam; the front crossbeam and the rear crossbeam adopt a modular structure.

[0009] The multi-layer sealing structure includes an upper pressure strip and a lower pressure strip; the upper pressure strip and the lower pressure strip are connected between the upper cover flange and the lower cover flange, and are located at the connection between the gate and the gate pull rod. When the gate is in the closed state, the upper pressure strip, the lower pressure strip, and the pressure ring seal the space where the gate is located; the upper pressure strip, the lower pressure strip, and the pressure ring are made of high temperature and corrosion resistant materials.

[0010] The steam purging mechanism includes a steam distribution pipe and a steam nozzle; the steam nozzle is disposed within a support frame; the steam nozzle is connected to an external steam supply device through the steam distribution pipe.

[0011] Multiple steam nozzles are provided; the multiple steam nozzles are arranged at multiple positions on the support frame of the valve plate near the steam purging mechanism.

[0012] The steam purging mechanism also includes a pressure control device, a temperature monitoring device, a sealing effect monitoring device, and a controller. The pressure control device is used to automatically adjust the steam pressure, and the temperature monitoring device is used to monitor the steam temperature. The sealing effect monitoring device is connected to the upper or lower cover flange and is used to monitor the valve leakage in real time. The controller is electrically connected to the external transmission mechanism of the pressure control device, the temperature monitoring device, the sealing effect monitoring device, and the external steam supply device, respectively, and is used to control the opening and closing of the steam purging mechanism and the gate.

[0013] A method for operating a slide gate valve, comprising the following steps: Step 1: Connect the gate lever to the external transmission mechanism; Step 2: Open the gate; When the transmission mechanism is activated, the gate lever is pulled outward, causing the gate to move to the side of the rear crossbeam. The connecting strip moves accordingly, and the steam inlet is opened. The steam distribution pipe and steam nozzle work synchronously, and the steam pressure is automatically adjusted within 0.2-0.8MPa, while the steam temperature is controlled within 120-200℃. At this time, the material begins to fall from the top of the gate valve. The steam purging mechanism uses positive steam purging to prevent external media from entering the gate valve body and to prevent the leakage of gas and water vapor carried by the material. Step 3: Close the gate; When the transmission mechanism is activated, the gate pull rod is pushed inward, which moves the gate and the strip connected to it, and the strip enters the inside of the strip cover. At the same time, the steam inlet is closed, and the steam distribution pipe and steam nozzle stop working synchronously. At this time, the material above the valve stops falling.

[0014] A gate valve is applied to the coke discharge system of an internally heated vertical carbonization furnace.

[0015] Beneficial effects: 1. This invention significantly reduces valve leakage, reducing leakage by more than 80% compared to ordinary slide gate valves, effectively reducing environmental pollution.

[0016] 2. This invention effectively prevents the leakage of water vapor, dust and gas by using the positive pressure purging function of the steam purging mechanism, greatly improving the operating environment and enhancing operational safety.

[0017] 3. The multi-layer sealing structure of this invention, combined with the steam purging system, significantly improves sealing performance, reduces system failure rate, and ensures stable operation and production capacity of the carbonization system.

[0018] 4. This invention uses high-temperature and corrosion-resistant materials and an optimized structural design, which extends the service life of the valve by 2-3 times and reduces maintenance costs.

[0019] 5. This invention integrates automatic control and online monitoring functions, enabling precise control of steam parameters and real-time monitoring of sealing performance, thereby improving the system's intelligence level.

[0020] 6. The modular design of this invention improves the product's versatility, enabling it to be adapted to different specifications of internally heated vertical carbonization furnaces, and has good prospects for industrial application.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a front view of the slide gate valve of the present invention.

[0024] Figure 2 is a top view of the slide gate valve of the present invention.

[0025] Figure 3 is a left view of the slide gate valve of the present invention.

[0026] Figure 4 is a schematic diagram of the front crossbeam in the slide gate valve of the present invention.

[0027] Figure 5 This is a schematic diagram of the upper cover flange in this invention.

[0028] Figure 6 This is a flowchart of the present invention.

[0029] In the diagram: 1. Front crossbeam; 2. Rear crossbeam; 3. Upper cover flange; 4. Lower cover flange; 5. Upper pressure strip; 6. Lower pressure strip; 7. Steam inlet; 8. Side beam; 9. Strip; 10. Strip cover; 11. Gate; 12. Steam distribution pipe; 13. Steam nozzle; 14. Pressure ring; 15. Steel pressure sleeve; 16. Fastener; 17. Gate pull rod. Detailed Implementation

[0030] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: according to Figure 1 Figure 5 shows a gate valve, comprising a support frame, an upper cover flange 3, a lower cover flange 4, a gate 11, a gate rod 17, a multi-layer sealing structure, and a steam purging mechanism. The upper cover flange 3 and the lower cover flange 4 are symmetrically and sealingly connected to the upper and lower parts of the support frame. The multi-layer sealing structure is vertically connected between the upper cover flange 3 and the lower cover flange 4, and is located in the middle of the upper cover flange 3 and the lower cover flange 4. The gate 11 is horizontally arranged in the middle between the upper cover flange 3 and the lower cover flange 4. One end of the gate 11 vertically passes through the multi-layer sealing structure and is detachably connected to one end of the horizontally arranged gate rod 17. The other end of the gate rod 17 extends to the outside of one side of the support frame. A pressure ring 14 is connected to the connection end of the gate 11 and the gate rod 17. A steel pressure sleeve 15 is connected to the connection point of the gate rod 17 and the support frame. The steam purging mechanism is connected to the inside of the other side of the support frame, and a steam inlet 7 is provided on the support frame at the connection point. The gate rod 17 is connected to an external transmission mechanism.

[0032] In actual use, when it is necessary to open the gate 11, first connect the gate lever 17 to the external transmission mechanism; start the external transmission mechanism to pull the gate lever 17 outward, causing the gate 11 to move to the left, and at the same time open the steam inlet 7. The steam purging mechanism works synchronously, and the steam pressure is automatically adjusted within the range of 0.2-0.8MPa, and the steam temperature is controlled within the range of 120-200℃. At this time, the material begins to fall from the top of the slide gate valve. The steam purging mechanism prevents external media from entering the slide gate valve body and prevents the leakage of gas and water vapor carried by the material through positive steam purging. When it is necessary to close the gate 11, start the transmission mechanism to push the gate lever 17 inward, causing the gate 11 to move to the left, and at the same time close the steam inlet 7. The steam purging mechanism stops working synchronously, and at this time the material above the valve stops falling.

[0033] In practical applications, the upper cover flange 3 and the lower cover flange 4 have the same structure, and the connection between the support frame and the upper cover flange 3 and the lower cover flange 4 is made by fastener 16.

[0034] This invention significantly reduces valve leakage, decreasing it by more than 80% compared to ordinary slide gate valves, effectively reducing environmental pollution. Through the positive pressure purging function of the steam purging mechanism, this invention effectively prevents the leakage of water vapor, dust, and gas, greatly improving the operating environment and enhancing operational safety.

[0035] In some embodiments, the device further includes a strip 9; two strips 9 are horizontally arranged; one end of each strip 9 is placed inside the support frame and is detachably connected to both sides of the other end of the gate 11; the other end of each strip 9 extends outside the support frame; the strip 9 and the steam purging mechanism are located on the same side inside the support frame.

[0036] Furthermore, it also includes a strip cover 10; the strip cover 10 is connected to the support frame and is located on the side where the strip 9 extends out of the support frame; the strip 9 placed outside the support frame moves into the strip cover 10 after it enters.

[0037] In actual use, when the gate 11 needs to be opened, the transmission mechanism is activated, pulling the gate lever 17 outward, causing the gate 11 to move to the left. The connecting strip 9 moves accordingly, and the steam inlet 7 is opened simultaneously. The steam distribution pipe 12 and the steam nozzle 13 work synchronously, and the steam pressure is automatically adjusted within the range of 0.2-0.8MPa, while the steam temperature is controlled within the range of 120-200℃. At this time, the material begins to fall from the top of the gate valve. The steam purging mechanism uses positive steam purging to prevent external media from entering the gate valve body and to prevent the leakage of gas and water vapor carried by the material. When the gate 11 needs to be closed, the transmission mechanism is activated, pushing the gate lever 17 inward. The gate 11 and the connecting strip 9 move accordingly, and the outer side of the strip 9 enters the inside of the strip cover 10. At the same time, the steam inlet 7 is closed, and the steam distribution pipe 12 and the steam nozzle 13 stop working synchronously. At this time, the material above the valve stops falling.

[0038] In practical applications, one end of each of the two inserts 9 is detachably connected to both sides of the other end of the gate 11, i.e., the tail side of the gate 11. When the gate 11 is opened, the inserts 9 move to the left and enter the original tracks on both sides of the gate 11 to prevent dust from entering and causing blockage. When the gate 11 is closed, the inserts 9 move to the right into the insert cover 10. The insert cover 10 not only provides a track for the inserts 9 but also prevents dust and gas from leaking out, thus playing a sealing role.

[0039] In some embodiments, the support frame includes at least a front crossbeam 1, a rear crossbeam 2, and side beams 8; two side beams 8 are provided, and the two side beams 8 are connected between the front crossbeam 1 and the rear crossbeam 2 to form a complete frame structure; the gate pull rod 17 passes horizontally through the center position of the rear crossbeam 2; the steam purging mechanism is connected to the center position inside the front crossbeam 1; the front crossbeam 1 and the rear crossbeam 2 adopt a modular structure.

[0040] The support frame adopts this structure, resulting in a compact overall structure while effectively fulfilling its function. The front crossbeam 1 and rear crossbeam 2 utilize a modular structure, enhancing the product's versatility and enabling it to adapt to different specifications of internally heated vertical carbonization furnaces, demonstrating promising prospects for industrial application.

[0041] In some embodiments, the multi-layer sealing structure includes an upper pressure strip 5 and a lower pressure strip 6; the upper pressure strip 5 and the lower pressure strip 6 are connected between the upper cover flange 3 and the lower cover flange 4, and are located at the connection between the gate 11 and the gate pull rod 17. When the gate 11 is in the closed state, the upper pressure strip 5, the lower pressure strip 6, and the pressure ring 14 seal the space where the gate 11 is located; the upper pressure strip 5, the lower pressure strip 6, and the pressure ring 14 are made of high-temperature resistant and corrosion-resistant materials.

[0042] In practical use, the upper pressure plate 5, lower pressure plate 6, and pressure ring 14 work together to form a better sealing structure, significantly improving sealing performance, reducing system failure rate, and ensuring stable operation and production capacity of the carbonization system. The upper pressure plate 5, lower pressure plate 6, and pressure ring 14 are made of high-temperature and corrosion-resistant materials, enabling them to withstand temperatures up to 400℃, extending valve service life by 2-3 times and reducing maintenance costs.

[0043] In this embodiment, the upper pressure strip 5 and the lower pressure strip 6 are made of heat-resistant steel 1Cr18Ni9Ti, and the pressure ring 14 is made of ZQSn5-5-5.

[0044] In some embodiments, the steam purging mechanism includes a steam distribution pipe 12 and a steam nozzle 13; the steam nozzle 13 is disposed within a support frame; the steam nozzle 13 is connected to an external steam supply device via the steam distribution pipe 12.

[0045] Furthermore, multiple steam nozzles 13 are provided; the multiple steam nozzles 13 are arranged at multiple positions on the support frame near the steam purging mechanism.

[0046] Furthermore, the steam purging mechanism also includes a pressure control device, a temperature monitoring device, a sealing effect monitoring device, and a controller. The pressure control device is used to automatically adjust the steam pressure, and the temperature monitoring device is used to monitor the steam temperature. The sealing effect monitoring device is connected to the upper cover flange 3 or the lower cover flange 4 to monitor the leakage of the valve in real time. The controller is electrically connected to the external transmission mechanism of the pressure control device, the temperature monitoring device, the sealing effect monitoring device, and the external steam supply device, respectively, to control the opening and closing of the steam purging mechanism and the gate 11.

[0047] In practical applications, steam nozzles 13 are distributed in multiple positions within the front crossbeam 1 at the front end of the gate 11, near the support frame of the steam purging mechanism. Positive steam purging prevents external media from entering the valve body. Pressure control and temperature monitoring devices are included, enabling automatic adjustment of steam pressure within the range of 0.2-0.8 MPa and steam temperature control within the range of 120-200℃. The overall design is modular to adapt to different specifications of internally heated vertical carbonization furnaces. Multiple steam nozzles 13 are arranged within the front crossbeam 1. The number of steam nozzles 13 should be no less than three, ideally one nozzle every 100 mm.

[0048] This invention integrates automatic control and online monitoring functions to achieve precise control of steam parameters and real-time monitoring of sealing effect, thereby improving the system's intelligence level.

[0049] Example 2: Reference Figure 1 Figure 6 illustrates a method for operating a slide gate valve, which includes the following steps: Step 1: Connect the gate lever 17 to the external transmission mechanism; Step 2: Open gate 11; When the transmission mechanism is activated, the gate lever 17 is pulled outward, which in turn pulls the gate 11 to the side of the rear crossbeam 2. The inlay 9 connected to it moves accordingly. At the same time, the steam inlet 7 is opened, and the steam distribution pipe 12 and steam nozzle 13 work synchronously. The steam pressure is automatically adjusted within the range of 0.2-0.8MPa, and the steam temperature is controlled within the range of 120-200℃. At this time, the material begins to fall from the top of the slide gate valve. The steam purging mechanism uses positive steam purging to prevent external media from entering the slide gate valve body and to prevent the leakage of gas and water vapor carried by the material. Step 3: Close gate 11; When the transmission mechanism is activated, the gate pull rod 17 is pushed inward, which moves the gate 11 and the strip 9 connected to it, and the strip 9 enters the inside of the strip cover 10. At the same time, the steam inlet 7 is closed, the steam distribution pipe 12 and the steam nozzle 13 stop working synchronously, and the material above the valve stops falling.

[0050] Example 3: A gate valve is applied to the coke discharge system of an internally heated vertical carbonization furnace. It has good prospects for industrial application.

[0051] Example 4: Examples of slide gate valve applications under high temperature and high pressure conditions.

[0052] A slide gate valve was designed and manufactured to address the harsh operating conditions of the coke discharge system in an internally heated vertical carbonization furnace. The front crossbeam 1 and rear crossbeam 2 are made of Q345R steel, with an H-shaped cross-section, 800mm high, 200mm wide, and 20mm thick. They are connected by four side beams 8 to form a frame structure with dimensions of 1200mm × 800mm × 600mm. The upper cover flange 3 and lower cover flange 4 are made of 16MnR steel, with flange specifications of DN800 and PN2.5MPa. The upper pressure strip 5 and lower pressure strip 6 are made of heat-resistant 1Cr18Ni9Ti steel, 1000mm long, 80mm wide, and 15mm thick, forming a three-layer sealing structure together with a graphite metal spiral wound gasket, a PTFE sealing ring, and an O-ring. The steam purging mechanism design includes a DN50 steam inlet 7, a 25mm diameter 316L stainless steel distribution pipeline, and 16 evenly distributed φ8mm steam nozzles 13 around the gate 11. The pressure control device uses an electric regulating valve in conjunction with a pressure sensor to achieve ±0.01MPa accuracy control within the range of 0.2-0.8MPa. The temperature monitoring device uses a PT100 platinum resistance thermometer with a monitoring accuracy of ±1℃. The insert 9 located on the sealing contact surface on the right side of the support frame is made of Stellite alloy weld overlay, 3mm thick, with a hardness of HRC45-50, and the insert cover 10 is made of 304 stainless steel.

[0053] Technical benefits: Under steam pressure of 0.6MPa and temperature of 160℃, the valve sealing leakage is reduced to 0.05±0.02L / min, a 98% reduction compared to the traditional slide gate valve's 2.5L / min, effectively solving the environmental pollution problem. The frame structure rigidity is increased by 40%, and the service life is extended to more than 5 years.

[0054] Example 5: An example of an economical configuration of a slide gate valve for use in low-pressure and low-temperature operating conditions.

[0055] For relatively mild coke discharge conditions, an economical design scheme is adopted. The frame structure uses Q235B steel, and the beam cross-section is simplified to a rectangular structure with dimensions of 600mm × 150mm × 15mm. The flange specification is adjusted to DN600, PN1.6MPa. The steam purging system is optimized to a DN40 air inlet, the distribution pipeline diameter is 20mm, and the number of steam nozzles (13) is reduced to 12, φ6mm. The sealing structure adopts a double-layer design, mainly relying on graphite metal spiral wound gaskets and PTFE sealing rings. The insert (9) is made of chromium-molybdenum steel with a thickness of 2mm and a hardness of HRC35-40.

[0056] Technical results: Under relatively mild operating conditions, the leakage rate is controlled at 0.08±0.03L / min, which is more than 95% lower than the traditional solution, and the equipment cost is reduced by 25% and the operating energy consumption is reduced by 35%.

[0057] The above embodiments four and five are two specific embodiments. In practical applications, the front crossbeam 1 and the rear crossbeam 2 are made of Q345R steel, and the beam cross-section is an H-shaped structure. The size can be selected according to needs. They are connected by four side beams 8 to form a rectangular frame structure that meets the requirements.

[0058] Where there is no conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. Specific details of the various combinations will not be elaborated here.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0060] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0061] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent variations, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A slide gate valve, characterized in that: The system includes a support frame, an upper cover flange (3), a lower cover flange (4), a gate (11), a gate tie rod (17), a multi-layer sealing structure, and a steam purging mechanism. The upper cover flange (3) and the lower cover flange (4) are symmetrically and sealingly connected to the upper and lower parts of the support frame. The multi-layer sealing structure is vertically connected between the upper cover flange (3) and the lower cover flange (4), and is located in the middle of the upper cover flange (3) and the lower cover flange (4). The gate (11) is horizontally arranged in the middle between the upper cover flange (3) and the lower cover flange (4). One end passes vertically through the multi-layer sealing structure and is detachably connected to one end of the horizontally arranged gate rod (17). The other end of the gate rod (17) extends to the outside of one side of the support frame. A pressure ring (14) is connected to the connection end of the gate (11) and the gate rod (17). A steel pressure sleeve (15) is connected to the connection between the gate rod (17) and the support frame. The steam purging mechanism is connected to the inside of the other side of the support frame, and a steam inlet (7) is provided on the support frame at the connection. The gate rod (17) is connected to an external transmission mechanism.

2. A slide gate valve as described in claim 1, characterized in that: It also includes a strip (9); two strips (9) are horizontally arranged; one end of each strip (9) is placed inside the support frame and is detachably connected to both sides of the other end of the gate (11); the other end of each strip (9) extends outside the support frame; the strip (9) and the steam purging mechanism are placed on the same side inside the support frame.

3. A slide gate valve as described in claim 2, characterized in that: It also includes a strip cover (10); the strip cover (10) is connected to the support frame and is located on the side where the strip (9) extends out of the support frame; the strip (9) part placed outside the support frame moves into the strip cover (10) after being moved.

4. A slide gate valve as described in claim 1, 2, or 3, characterized in that: The support frame includes at least a front crossbeam (1), a rear crossbeam (2), and side beams (8); two side beams (8) are provided, and the two side beams (8) are connected between the front crossbeam (1) and the rear crossbeam (2) to form a complete frame structure; the gate pull rod (17) passes horizontally through the center position of the rear crossbeam (2); the steam purging mechanism is connected to the center position inside the front crossbeam (1); the front crossbeam (1) and the rear crossbeam (2) adopt a modular structure.

5. A slide gate valve as described in claim 1, characterized in that: The multi-layer sealing structure includes an upper pressure strip (5) and a lower pressure strip (6); the upper pressure strip (5) and the lower pressure strip (6) are connected between the upper cover flange (3) and the lower cover flange (4), and are located at the connection between the gate (11) and the gate pull rod (17). When the gate (11) is in the closed state, the upper pressure strip (5), the lower pressure strip (6), and the pressure ring (14) seal the space where the gate (11) is located; the upper pressure strip (5), the lower pressure strip (6), and the pressure ring (14) are made of high temperature and corrosion resistant materials.

6. A slide gate valve as described in claim 1, characterized in that: The steam purging mechanism includes a steam distribution pipe (12) and a steam nozzle (13); the steam nozzle (13) is disposed within the support frame; the steam nozzle (13) is connected to an external steam supply device through the steam distribution pipe (12).

7. A slide gate valve as described in claim 6, characterized in that: Multiple steam nozzles (13) are provided; multiple steam nozzles (13) are arranged at multiple positions on the valve plate (11) near the support frame of the steam purging mechanism.

8. A slide gate valve as described in claim 1, 6, or 7, characterized in that: The steam purging mechanism also includes a pressure control device, a temperature monitoring device, a sealing effect monitoring device, and a controller. The pressure control device is used to automatically adjust the steam pressure, and the temperature monitoring device is used to monitor the steam temperature. The sealing effect monitoring device is connected to the upper cover flange (3) or the lower cover flange (4) and is used to monitor the leakage of the valve in real time. The controller is electrically connected to the external transmission mechanism of the pressure control device, the temperature monitoring device, the sealing effect monitoring device, and the external steam supply device, respectively, and is used to control the opening and closing of the steam purging mechanism and the gate (11).

9. A method for operating a slide gate valve, characterized in that: The slide gate valve as described in any one of claims 1-8 comprises the following steps: Step 1: Connect the gate lever (17) to the external transmission mechanism; Step 2: Open the gate (11); When the transmission mechanism is activated, the gate lever (17) is pulled outward, which drives the gate (11) to the side of the rear crossbeam (2). The inlay (9) connected to it moves accordingly. At the same time, the steam inlet (7) is opened, the steam distribution pipe (12) and the steam nozzle (13) work synchronously, and the steam pressure is automatically adjusted within 0.2-0.8MPa. The steam temperature is controlled within the range of 120-200℃. At this time, the material begins to fall from the top of the slide gate valve. The steam purging mechanism prevents the external medium from entering the slide gate valve body through positive steam purging and prevents the gas and water vapor carried by the material from leaking out. Step 3: Close the gate (11); When the transmission mechanism is activated, the gate pull rod (17) is pushed inward, and the gate (11) and the strip (9) connected to it are moved accordingly, and the strip (9) enters the inside of the strip cover (10). At the same time, the steam inlet (7) is closed, and the steam distribution pipe (12) and the steam nozzle (13) stop working synchronously. At this time, the material above the valve stops falling.

10. Applying a gate valve with a steam seal as described in any one of claims 1-8 to the coke discharge system of an internally heated vertical carbonization furnace.

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