Continuous flow control type closed decoking flow-limiting valve

Abstract

The utility model belongs to the technical field of petrochemical equipment, and provides a continuous flow control type closed decoking flow-limiting valve which comprises a valve body, a first composite valve element and a second composite valve element. The first composite valve core comprises a first valve plate, a first valve core, a first driving mechanism and the like; the second composite valve element and the first composite valve element are symmetrical. According to the flow-limiting valve, the through grooves of the first combined valve element and the second combined valve element jointly form a small valve hole, the first driving mechanism drives the first connecting rod to move to drive the first transmission rod and the first valve element to move, and therefore the small valve hole can be opened. The first driving mechanism drives the first connecting rod to continue to move until the first transmission rod abuts against the first limiting ring and drives the first valve plate to move, and then the large valve hole can be opened. Equipment is arranged at the position of a small valve hole during flow limiting, and is arranged at the position of a large valve hole during coke cutting, so that the problem that the fluid shear force cannot be dynamically adjusted to inhibit coking due to the adoption of a fixed flow limiting hole diameter in a traditional plate type flow limiting valve is effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of petrochemical equipment technology, specifically relating to a continuous flow-controlled closed decoking valve. Background Technology

[0002] During the decoking process of the coke tower in the delayed coking unit, coke and coke cutting water are discharged from the bottom outlet of the coke tower. When the borehole is opened, the coke water pours down through the coke chute in a very short time, with an instantaneous flow rate of up to tens of thousands of cubic meters per hour; while the coke water flow rate is small and uniform during the coke cutting process.

[0003] Traditional coking removal methods utilize large-space, floor-to-ceiling coke pits or dewatering tanks to collect and store coke liquid. Gravity dewatering then occurs within these tanks or tanks, followed by the transfer of dry coke via overhead cranes and conveyor belts. Traditional coking removal processes cannot achieve stable, continuous production line operation. Besides presenting numerous disadvantages such as difficulties in waste gas treatment, large equipment requirements, and extensive land occupation, the coking removal process can only be intermittent, resulting in excessively long dewatering times. A significant amount of time is consumed in the waiting periods for coke discharge and gravity filtration, leading to low equipment utilization and extremely poor operational efficiency.

[0004] To address the aforementioned issues, existing solutions involve using spiral dewatering machines and vibrating dewatering screens for online, continuous, and forced dewatering. However, existing dewatering equipment cannot handle instantaneous feed flows of tens of thousands of cubic meters per hour, nor can it withstand the head impact generated by such massive flows. Valves are needed to control the flow rate during the initial drilling phase. Using traditional plate-type flow restrictors presents the following problems:

[0005] 1. During drilling, the flow velocity through the valve is very high, requiring a very small valve diameter; however, during coke cutting, the coke flow velocity is low and the coke contains large pieces, requiring a very large valve diameter to prevent material jamming. Ordinary large-diameter valves must have a very small valve opening when controlling a small flow rate, otherwise small particles in the coke will clog the valve, making them unsuitable for coke flow control.

[0006] 2. Traditional plate-type flow restrictor valves are prone to jamming due to coking during the transportation of high-temperature hydrocarbon fluids.

[0007] 3. Traditional plate-type flow restrictor valves use a fixed flow restrictor orifice diameter, which cannot dynamically adjust the fluid shear force to suppress coking. Utility Model Content

[0008] To address the shortcomings of existing technologies, this invention provides a continuous flow-controlled, sealed coke removal flow limiting valve, which can solve the aforementioned problems.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a continuous flow control type closed decoking flow limiting valve, comprising a valve body, a first composite valve core, and a second composite valve core;

[0010] The valve body is provided with a slide rail, and the valve body is provided with a large valve hole through it, which is connected to the slide rail;

[0011] The first composite valve core and the second composite valve core are symmetrical;

[0012] The first composite valve core includes a first valve plate, a first valve core, and a first drive mechanism;

[0013] The first valve plate is slidably disposed within the slide rail. A first through groove is provided on the side wall of the first valve plate near the second composite valve core. A first receiving hole is provided through the first valve plate, and the first receiving hole is aligned and communicates with the first through groove. A first limiting ring is provided on the inner wall of the first receiving hole at the end away from the first through groove. The first valve core is located within the first receiving hole. A first transmission rod is provided at the end of the first valve core away from the first through groove. A first connecting rod is provided at the end of the first transmission rod away from the first valve core. The end of the first connecting rod away from the first transmission rod extends through the first limiting ring to the outside of the first receiving hole. A first reset ring is sleeved on the outside of the first connecting rod. The first reset ring is located outside the first receiving hole. The first driving mechanism is used to drive the first connecting rod to move along the slide rail direction.

[0014] Preferably, a first annular groove is provided on the inner wall of the first limiting ring, and a first sealing ring is provided in the first annular groove.

[0015] Preferably, the first composite valve core further includes a first sealing box, which is disposed on the valve body and communicates with the slide rail.

[0016] Preferably, the first drive mechanism is located on the outside of the first sealed box, and the power output end of the first drive mechanism extends to the inside of the first sealed box.

[0017] Preferably, the first sealed box has a rinsing port and a water outlet on its side wall.

[0018] Preferably, the first composite valve core further includes a first guide rod and a first guide sleeve. The first guide sleeve is disposed on the first sealing box and is parallel to the slide rail direction. The first guide rod is fixedly connected to the first valve plate and slides with the first guide sleeve.

[0019] Preferably, the valve body is equipped with a high-pressure injection device.

[0020] Preferably, the valve body has a double-layer structure, with the inner layer of the valve body being a wear-resistant alloy layer and the outer layer of the valve body being a carbon steel layer.

[0021] Preferably, the first valve core is a wear-resistant alloy bar.

[0022] Preferably, the surface of the first valve core is coated with a hard coating.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] This utility model provides a continuous flow-controlled, sealed coking removal flow-limiting valve. The through grooves of the first and second composite valve cores together form a small valve orifice. A first driving mechanism drives a first connecting rod to move, which in turn moves a first transmission rod and the first valve core, thereby opening the small valve orifice. Then, the first driving mechanism drives the first connecting rod to continue moving until the first transmission rod contacts the first limit ring, causing the first valve plate to move, thus opening the large valve orifice. When flow is limited, the equipment is positioned at the small valve orifice; when coking is removed, the equipment is positioned at the large valve orifice. This effectively solves the problem of traditional plate-type flow-limiting valves using a fixed flow-limiting orifice diameter, which cannot dynamically adjust the fluid shear force to suppress coking. Attached Figure Description

[0025] Figure 1 A top view of a continuously controlled flow type closed decoking flow limiting valve provided for an embodiment of this utility model;

[0026] Figure 2 A top view of the structure of a continuous flow-controlled, sealed decoking flow-limiting valve with its small valve orifice open, provided for an embodiment of this utility model;

[0027] Figure 3 A top view of the structure of a continuous flow-controlled, sealed decoking flow-limiting valve when the large valve orifice is open, provided for an embodiment of this utility model.

[0028] Figure 4 A three-dimensional structural diagram of the slide and related parts of a continuous flow-controlled closed decoking flow-limiting valve provided for an embodiment of this utility model;

[0029] Figure 5 A three-dimensional structural diagram of the first valve plate and related parts of a continuous flow-controlled closed decoking flow-limiting valve provided for an embodiment of this utility model;

[0030] Figure 6 A top view of the first receiving hole and related parts of a continuous flow-controlled closed decoking valve provided in an embodiment of this utility model;

[0031] Figure 7 A cross-sectional view of the first receiving hole and related parts of a continuous flow-controlled closed decoking valve provided in an embodiment of this utility model;

[0032] Figure 8A cross-sectional view of the first guide rod and related parts of a continuous flow-controlled closed decoking valve provided for an embodiment of this utility model;

[0033] Figure 9 A three-dimensional structural diagram of the spring and related parts of a continuous flow-controlled closed decoking valve provided for an embodiment of this utility model.

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 1. Valve body;

[0036] 2. Slide;

[0037] 3. Large valve orifice;

[0038] 4. First valve plate;

[0039] 5. First valve core;

[0040] 6. First drive mechanism;

[0041] 7. First through slot;

[0042] 8. First receiving hole;

[0043] 9. First limiting ring;

[0044] 10. First transmission rod;

[0045] 11. First link;

[0046] 12. First reset ring;

[0047] 13. First guide rod;

[0048] 14. First guide sleeve;

[0049] 15. First sealed box;

[0050] 16. Second valve plate;

[0051] 17. Second valve core;

[0052] 18. Second drive mechanism;

[0053] 19. Second through slot;

[0054] 20. Second receiving hole;

[0055] 21. Second limiting ring;

[0056] 22. Second transmission rod;

[0057] 23. Second link;

[0058] 24. Second reset ring;

[0059] 25. Spring;

[0060] 26. Flexible protective bag. Detailed Implementation

[0061] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0062] This embodiment provides a continuous flow-controlled closed decoking valve, including a valve body 1, a first composite valve core, and a second composite valve core.

[0063] The valve body 1 is provided with a slide 2, and a large valve hole 3 is provided through the valve body 1, which is connected to the slide 2.

[0064] For example, see Figure 4-5 The valve body 1 has a slide 2 along the front-to-back direction, and the slide 2 runs through the entire valve body 1. At the same time, the valve body 1 has a large valve hole 3 running through it vertically, and the large valve hole 3 is connected to the slide 2.

[0065] The first composite valve core includes a first valve plate 4, a first valve core 5, and a first drive mechanism 6. The first valve plate 4 is slidably disposed in the slide rail 2. A first through groove 7 is provided on the side wall of the first valve plate 4 near the second composite valve core. A first receiving hole 8 is provided through the first valve plate 4. The first receiving hole 8 is aligned and connected with the first through groove 7. A first limiting ring 9 is provided on the inner wall of the end of the first receiving hole 8 away from the first through groove 7. The first valve core 5 is located in the first receiving hole 8. A first transmission rod 10 is provided at the end of the first valve core 5 away from the first through groove 7. A first connecting rod 11 is provided at the end of the first transmission rod 10 away from the first valve core 5. The end of the first connecting rod 11 away from the first transmission rod 10 extends through the first limiting ring 9 to the outside of the first receiving hole 8. A first reset ring 12 is sleeved on the outside of the first connecting rod 11. The first reset ring 12 is located outside the first receiving hole 8. The first drive mechanism 6 is used to drive the first connecting rod 11 to move along the slide rail 2.

[0066] For example, see Figure 5-7A first valve plate 4 is slidably disposed within a slide rail 2. A vertical first through groove 7 is provided at the front end of the first valve plate 4. A first receiving hole 8 extends through the front and rear of the first valve plate 4, and the first receiving hole 8 is aligned and connected to the first through groove 7. A first limiting ring 9 is fixedly disposed on the inner wall of the rear end of the first receiving hole 8. A first valve core 5 is coaxially disposed within the first receiving hole 8, and the first valve core 5 is adapted to the first receiving hole 8. The front end of the first valve core 5 extends into the first through groove 7. A first transmission rod 10 is coaxially fixed to the rear end of the first valve core 5. The diameter of the first transmission rod 10 is larger than the inner diameter of the first limiting ring 9. A first connecting rod 11 is coaxially fixed to the rear end of the first transmission rod 10. The diameter of the first connecting rod 11 is adapted to the inner diameter of the first limiting ring 9. The rear end of the first connecting rod 11 extends through the first limiting ring 9 to the outside of the first receiving hole 8. A first reset ring 12 is fixedly sleeved on the outside of the first connecting rod 11. The first reset ring 12 is located outside the first receiving hole 8, and its diameter is larger than the inner diameter of the first limiting ring 9. The first drive mechanism 6 is a hydraulic cylinder (or a servo motor, hydraulic motor, etc.). The power output end of the first drive mechanism 6 is fixedly connected to the rear end of the first connecting rod 11, and the extension and retraction direction of the power output end of the first drive mechanism 6 is parallel to the axis of the first receiving hole 8.

[0067] The second composite valve core is symmetrical to the first composite valve core.

[0068] For example, see Figure 6 The second composite valve core is symmetrical to the first composite valve core.

[0069] The second composite valve core includes a second valve plate 16, a second valve core 17, and a second drive mechanism 18;

[0070] The second valve plate 16 is slidably disposed within the slide rail. A vertical second through groove 19 is provided at the rear end of the second valve plate 16. A second receiving hole 20 is provided through the front and rear of the second valve plate 16, and the second receiving hole 20 is aligned and connected to the second through groove 19. A second limiting ring 21 is fixedly provided on the inner wall of the front end of the second receiving hole 20. The second valve core 17 is coaxially placed within the second receiving hole 20, and the second valve core 17 is adapted to the second receiving hole 20. The rear end of the second valve core 17 extends into the second through groove 19. A second transmission rod 22 is coaxially fixed to the front end of the second valve core 17. The diameter of the second transmission rod 22 is larger than the inner diameter of the second limiting ring 21. A second connecting rod 23 is coaxially fixed to the front end of the second transmission rod 22. The diameter of the second connecting rod 23 is adapted to the inner diameter of the second limiting ring 21. The front end of the second connecting rod 23 passes through the second limiting ring 21 and extends to the outside of the second receiving hole 20. A second reset ring 24 is fixedly sleeved on the outer side of the second connecting rod 23. The second reset ring 24 is located outside the second receiving hole 20, and its diameter is larger than the inner diameter of the second limiting ring 21. The second drive mechanism 18 is a hydraulic cylinder (or a servo motor, hydraulic motor, etc.). The power output end of the second drive mechanism 18 is fixedly connected to the front end of the second connecting rod 23, and the extension and retraction direction of the power output end of the second drive mechanism 18 is parallel to the axial direction of the second receiving hole 20.

[0071] Based on the above structure, the flow limiting valve provided in this embodiment is described in [reference needed]. Figure 1-2 When the first valve plate 4 and the second valve plate 16 abut against each other, the first through groove 7 and the second through groove 19 together form a small valve hole. When the first valve core 5 and the second valve core 17 abut against each other, they can jointly close the small valve hole, and at the same time, the first valve plate 4 and the second valve plate 16 can jointly close the large valve hole 3, thus realizing the closure of the valve.

[0072] The first driving mechanism 6 drives the first connecting rod 11 to move backward, which in turn moves the first transmission rod 10 and the first valve core 5, opening half of the small valve orifice. Then, the first driving mechanism 6 drives the first connecting rod 11 to continue moving until the first transmission rod 10 contacts the first limiting ring 9, which in turn moves the first valve plate 4, opening half of the large valve orifice.

[0073] Simultaneously, the second drive mechanism 18 drives the second connecting rod 23 to move forward, which in turn moves the second transmission rod 22 and the second valve core 17, opening the other half of the small valve hole. Then, the second drive mechanism 18 drives the second connecting rod 23 to continue moving until the second transmission rod 22 abuts against the second limit ring 21, which in turn moves the second valve plate 16, opening the other half of the large valve hole.

[0074] Conversely, the first driving mechanism 6 drives the first connecting rod 11 forward until the first reset ring 12 contacts the first limiting ring 9, which can drive the first valve plate 4 forward; the second driving mechanism 18 drives the second connecting rod 23 backward until the second reset ring 24 contacts the second limiting ring 21, which can drive the second valve plate 16 backward. When the first valve core 5 and the second valve core 17 contact again, the valve can be closed.

[0075] In other words, the size of the small valve orifice can be adjusted in real time through the drive mechanism to control the flow rate, generate pulse impact to prevent blockage, change the fluid velocity and shear force, and suppress coking (for example, the first valve core 5 makes a back-and-forth periodic movement in the small valve orifice, so that the different openings of the cross-section through which water and coke pass during the flow restriction process generate a velocity difference, thereby generating local turbulence and preventing coking or blockage at the flow restriction orifice plate). When restricting the flow, the equipment is placed at the small valve orifice position, and when cutting coke, the equipment is placed at the large valve orifice position (the valve orifice design margin is large enough), which effectively solves the problem that traditional plate-type flow restriction valves use a fixed flow restriction orifice diameter and cannot dynamically adjust the fluid shear force to suppress coking.

[0076] Based on the above technical solutions, the technical solution provided in this embodiment,

[0077] The valve body 1 can be a double-layer structure, with the inner layer of the valve body 1 being a wear-resistant alloy layer and the outer layer of the valve body 1 being a carbon steel layer.

[0078] The first valve plate 4 and the second valve plate 16 can be integrally welded thick flat plates of carbon steel.

[0079] The first valve core 5 and the second valve core 17 can be wear-resistant alloy bars. The surfaces of the first valve core 5 and the second valve core 17 can be plated with a hard coating, such as tungsten carbide, to resist wear.

[0080] In the technical solution provided in this embodiment, a first annular groove can be opened on the inner wall of the first limiting ring 9, and a first sealing ring is provided in the first annular groove, which can improve the sealing performance.

[0081] Similarly, a second annular groove can be provided on the inner wall of the second limiting ring 21, and a second sealing ring can be provided in the second annular groove to improve the sealing performance.

[0082] In the technical solution provided in this embodiment, the first composite valve core further includes a first sealing box 15, which is disposed on the valve body 1 and communicates with the slide 2. A first driving mechanism 6 is disposed on the outer wall of the first sealing box 15, and the power output end of the first driving mechanism 6 extends to the inner side of the first sealing box 15.

[0083] For example, see Figure 6-7 The first sealing box 15 is located at the rear end of the valve body 1, with an opening at its front end. This opening is sealed and connected to the rear end of the slide rail 2, allowing the first valve plate 4 and other components to enter the first sealing box 15. The first sealing box 15 provides a sealing and protective function. The first driving mechanism 6 is located at the rear end of the first sealing box 15. The first sealing box 15 has a through hole, through which the power output end of the first driving mechanism 6 extends into the inner side of the first sealing box 15, and a sealing treatment is applied between the power output end of the first driving mechanism 6 and the through hole.

[0084] The sealing between the valve body 1 and the first valve plate 4 does not need to be too demanding, allowing a small amount of leakage into the first sealing box 15. The first sealing box 15 is provided with a flushing port and a water outlet for easy flushing and drainage.

[0085] In the technical solution provided in this embodiment, the first composite valve core also includes a first guide rod 13 and a first guide sleeve 14. The first guide sleeve 14 is disposed on the first sealing box 15. The first guide sleeve 14 is parallel to the slide 2. The first guide rod 13 is fixedly connected to the first valve plate 4. The first guide rod 13 and the first guide sleeve 14 are slidably engaged.

[0086] For example, see Figure 6 , Figure 8The first guide sleeve 14 is located at the rear end of the first sealing box 15. The first sealing box 15 is provided with a guide hole. The front end of the first guide rod 13 is fixedly connected to the first valve plate 4, and the rear end of the first guide rod 13 extends into the first guide sleeve 14 through the guide hole. The first guide rod 13 and the first guide sleeve 14 slide in each other, which can improve the sliding stability of the first valve plate 4, thereby improving the stability of valve opening and closing.

[0087] Similarly, the second composite valve core also includes a second sealing box, a second guide rod, and a second guide sleeve, which will not be described in detail here.

[0088] In the technical solution provided in this embodiment, a high-pressure injection device can be installed inside the valve body 1. Supercritical water or chemical cleaning agents are periodically sprayed to clean the valve core and prevent coking. The cleaning cycle can be predicted based on a coking model, triggering the high-pressure injection system to automatically remove coke.

[0089] The technical solution provided in this embodiment may also include a PLC controller, pressure sensor, flow meter, temperature sensor, etc. The pressure sensor and flow meter monitor pipeline data in real time and feed it back to the PLC controller, automatically adjusting the valve core opening and valve plate position until the flow rate stabilizes. Alternatively, based on the feedback data from the pressure and temperature sensors, a PID algorithm can be used to dynamically adjust the valve plate opening to maintain the optimal flow rate.

[0090] In the technical solution provided in this embodiment, the first composite valve core also includes a spring 25, which is sleeved on the outside of the first transmission rod 10.

[0091] For example, see Figure 9 A spring 25 is coaxially sleeved on the outer side of the first transmission rod 10. The first end of the spring 25 is fixedly connected to the first valve core 5, and the second end of the spring 25 is a free end. The second end of the spring 25 extends to the outer side of the first connecting rod 11, that is, the axial length of the spring 25 is longer than that of the first transmission rod 10.

[0092] When the first connecting rod 11 is driven to move backward by the first driving mechanism 6, it can drive the first transmission rod 10 and the first valve core 5 to move, which in turn can drive the spring 25 to move. The second end of the spring 25 will first contact the first limiting ring 9. When the first connecting rod 11 is driven to continue moving by the first driving mechanism 6, the spring 25 will be compressed until the first transmission rod 10 contacts the first limiting ring 9. The spring 25 will be compressed to its shortest length. At this time, when the first connecting rod 11 is driven to continue moving by the first driving mechanism 6, it can drive the first transmission rod 10 and the first valve core 5 to move, and at the same time, it can drive the first limiting ring 9 and the first valve plate 4 to move.

[0093] The spring 25 provides prestress. After the spring 25 contacts the first limiting ring 9 but before the first transmission rod 10 contacts the first limiting ring 9, the elastic force (thrust) exerted by the spring 25 on the first limiting ring 9 gradually increases. However, this thrust is insufficient to move the first limiting ring 9 and the first valve plate 4. Only after the first transmission rod 10 contacts the first limiting ring 9 will the first limiting ring 9 and the first valve plate 4 move. Even then, the spring 25 still exerts a thrust on the first limiting ring 9, while the thrust exerted by the first limiting ring 9 on the first valve plate 4 is smaller, significantly less than the thrust without the spring 25.

[0094] In other words, the force on the first limiting ring 9 gradually increases, rather than suddenly increasing to the point where it can push the first limiting ring 9 and the first valve plate 4 to move. This can prevent the first transmission rod 10 from rigidly colliding with the first limiting ring 9, and at the same time reduce the instantaneous force on the first limiting ring 9, thus preventing the first limiting ring 9 from being subjected to multiple violent impacts, which could damage the first limiting ring 9 or even cause it to fall off the first valve plate 4.

[0095] In the technical solution provided in this embodiment, the first composite valve core also includes a flexible protective bag 26, which is disposed inside the first sealing box 15.

[0096] For example, see Figure 7 , Figure 9 One end of the flexible protective bag 26 is sealed to the inner wall of the first sealed box 15, and the other end is sealed to the side wall of the first valve plate 4. The flexible protective bag 26 is aligned with the first receiving hole 8, ensuring that the sections of the telescopic rod, the first reset ring 12, and the first connecting rod 11 of the first drive mechanism 6 exposed outside the first receiving hole 8 are all located inside the flexible protective bag 26. When the first valve plate 4 moves, it can cause the flexible protective bag 26 to extend or retract without affecting the operation of the equipment.

[0097] See Figure 7 Water in the first receiving hole 8 cannot enter the flexible protective bag 26 through the first sealing ring, and water in the first sealing box 15 also cannot enter the flexible protective bag 26. That is, the flexible protective bag 26, together with the first sealing ring on the inner wall of the first limiting ring 9, forms a complete sealing system, protecting the first reset ring 12 and the first drive mechanism 6, preventing water from seeping into the first drive mechanism 6 and causing equipment damage. Secondly, it also prevents coke from entering between the first reset ring 12 and the first limiting ring 9, which would cause the first limiting ring 9 to be pushed prematurely, causing the first valve plate 4 to move prematurely, preventing the first valve core 5 from fully resetting, and ultimately preventing the small valve hole from fully closing.

[0098] Similarly, the second composite valve core also includes a spring and a flexible protective bag, which will not be described in detail here.

[0099] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0100] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0101] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0102] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A continuously controlled flow type closed coke removal flow limiting valve, characterized in that, Includes valve body (1), first composite valve core, and second composite valve core; The valve body (1) is provided with a slide (2), and the valve body (1) is provided with a large valve hole (3) through it, and the large valve hole (3) is connected to the slide (2); The first composite valve core and the second composite valve core are symmetrical; The first composite valve core includes a first valve plate (4), a first valve core (5), and a first drive mechanism (6); The first valve plate (4) is slidably disposed in the slide rail (2). A first through groove (7) is provided on the side wall of the first valve plate (4) near the second composite valve core. A first receiving hole (8) is provided through the first valve plate (4). The first receiving hole (8) is aligned and connected with the first through groove (7). A first limiting ring (9) is provided on the inner wall of the end of the first receiving hole (8) away from the first through groove (7). The first valve core (5) is located in the first receiving hole (8). A first limiting ring (9) is provided on the end of the first valve core (5) away from the first through groove (7). There is a first transmission rod (10), and a first connecting rod (11) is provided at the end of the first transmission rod (10) away from the first valve core (5). The end of the first connecting rod (11) away from the first transmission rod (10) extends through the first limiting ring (9) to the outside of the first receiving hole (8). A first reset ring (12) is sleeved on the outside of the first connecting rod (11). The first reset ring (12) is located outside the first receiving hole (8). The first driving mechanism (6) is used to drive the first connecting rod (11) to move along the slide (2).

2. The continuous flow-controlled, sealed coke removal flow-limiting valve according to claim 1, characterized in that, The first limiting ring (9) has a first annular groove on its inner wall and a first sealing ring is provided in the first annular groove.

3. The continuously controlled flow type sealed coke removal flow limiting valve according to claim 1, characterized in that, The first composite valve core also includes a first sealing box (15), which is disposed on the valve body (1) and is connected to the slide (2).

4. The continuous flow-controlled closed coking valve according to claim 3, characterized in that, The first drive mechanism (6) is located outside the first sealed box (15), and the power output end of the first drive mechanism (6) extends to the inside of the first sealed box (15).

5. A continuously controlled flow type sealed coke removal flow limiting valve according to claim 3, characterized in that, The first sealed box (15) has a rinsing port and a water outlet on its side wall.

6. A continuously controlled flow type sealed coke removal flow limiting valve according to claim 3, characterized in that, The first composite valve core also includes a first guide rod (13) and a first guide sleeve (14). The first guide sleeve (14) is disposed on the first sealing box (15). The first guide sleeve (14) is parallel to the slide (2). The first guide rod (13) is fixedly connected to the first valve plate (4). The first guide rod (13) and the first guide sleeve (14) are in sliding cooperation.

7. A continuously controlled flow type sealed coke removal flow limiting valve according to claim 1, characterized in that, The valve body (1) is equipped with a high-pressure injection device.

8. A continuously controlled flow type sealed coke removal flow limiting valve according to claim 1, characterized in that, The valve body (1) has a double-layer structure, with the inner layer being a wear-resistant alloy layer and the outer layer being a carbon steel layer.

9. A continuously controlled flow type sealed coke removal flow limiting valve according to claim 1, characterized in that, The first valve core (5) is a wear-resistant alloy bar.

10. A continuously controlled flow type sealed coke removal flow limiting valve according to claim 1, characterized in that, The surface of the first valve core (5) is coated with a hard coating.

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