Continuous flow control type closed decoking flow limiting and blocking prevention device

Abstract

The utility model relates to a continuous flow control type closed decoking flow limiting and anti-blocking device, including flow limiting valve and two -stage anti -blocking mechanism, flow limiting valve includes valve body subassembly, and its inside forms closed valve chamber, and coaxially sets up left valve plate subassembly and right valve plate subassembly in valve chamber, and left, right valve plate subassembly fixedly connects guide rod respectively, and guide rod fixedly connects drive mechanism after from valve chamber, and left, right valve plate subassembly can be synchronous and move in the valve chamber along the axial synchronous or opposite under the drive of drive mechanism, and further change the interval between both through axial movement, form adjustable area's overflow passage between both, realize accurate flow limiting, control decoking initial transient flow, avoid the accumulation blockage of coke block because of overload, complete primary flow limiting and anti-blocking, two -stage anti -blocking mechanism includes the projection and the recess that set up separately in the end of left, right valve plate subassembly, and the projection can be driven under left, right valve plate subassembly and break up the blockage through high -frequency action occlusion, realize active unblocking, complete two -stage anti -blocking.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical equipment technology, specifically to a continuous flow-controlled closed decoking device for limiting flow and preventing blockage. Background Technology

[0002] Continuous controlled-flow closed coking systems (existing technology) are crucial in the field of delayed coking in petroleum refining. Traditional closed coking systems, during the processing of high-temperature coke, generate large amounts of oily, sulfurous wastewater and volatile harmful substances in the cold coke water and overflow, causing significant environmental pollution. Existing closed coking systems mainly employ a combination of a bottom crusher and a dewatering chamber for transfer. A hydraulic lifting sealing sleeve is installed below the coke tower, connected to a screening conveyor via a single flow-limiting valve. The screening conveyor is then connected to the crusher and dewatering chamber.

[0003] In this system, the flow limiting valve is a key control component. By precisely adjusting the opening of the flow limiting valve, the excessive instantaneous flow rate at the beginning of decoking can be avoided, which could lead to pipe blockage.

[0004] However, in applications of existing flow-limiting valves in closed decoking scenarios, blockages often occur due to the accumulation of tar, asphalt, carbon slag, etc., in the valve cavity, affecting sealing performance and flow control accuracy. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing a continuous flow-controlled, sealed coke removal device with flow-limiting and anti-blocking capabilities.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A continuous flow-controlled, closed-loop decoking device for limiting flow and preventing blockage includes a flow-limiting valve and a secondary anti-blockage mechanism located inside the flow-limiting valve. The flow-limiting valve includes a valve body assembly with a closed valve cavity structure inside. A left valve plate assembly and a right valve plate assembly are coaxially arranged inside the valve cavity. Guide rods are fixedly connected to the left and right valve plate assemblies, and the two guide rods extend axially from both ends of the valve cavity and are fixedly connected to a drive mechanism. The left and right valve plate assemblies can move synchronously towards or away from each other axially within the valve cavity under the drive mechanism, thereby changing the distance between them through axial movement and forming an adjustable flow channel between them. The left and right valve plate assemblies, the guide rods, and the inner wall of the valve cavity are all sealed with seals. The secondary anti-blockage mechanism includes protrusions and grooves located at the ends of the left and right valve plate assemblies. The protrusions and grooves can bite and break up the blockage material through high-frequency action driven by the left and right valve plate assemblies.

[0007] The beneficial effects of this utility model are as follows: By connecting the valve plate assembly to the drive mechanism, the traditional flow-limiting valve, which can only be passively moved by fluid pressure, is upgraded to a controllable flow-limiting valve that can be precisely adjusted manually; by adding a secondary anti-clogging mechanism inside the flow-limiting valve, active anti-clogging is achieved by using the high-frequency action of the concave-convex structure to bite and break up the blockage material. This application proposes for the first time a dual-stage flow-limiting and anti-clogging structure of "flow-limiting valve - secondary anti-clogging mechanism", which effectively solves the problem of instantaneous overload in the initial stage of decoking, significantly reduces the risk of blockage, and improves sealing performance and flow control accuracy.

[0008] Furthermore, the valve cavity has an inlet and an outlet on both sides of the flow channel in the middle, and the inlet and outlet are connected through the flow channel. The valve cavity can be connected to the coke removal system conveying pipeline through the inlet and outlet.

[0009] Furthermore, the valve cavity is provided with a flushing port and a water outlet on its upper and lower sides, respectively. The flushing port is connected to an external high-pressure water source, and both the flushing port and the water outlet are connected to the valve cavity. By connecting to a high-pressure water source, the inside of the valve cavity can be flushed, further preventing the accumulation of coke suspended particles and high-viscosity media in the valve cavity and causing blockage, thereby improving the flow control accuracy.

[0010] Furthermore, the valve body assembly includes a valve body, a left cover, a right cover, an upper valve sealing cover, a lower valve sealing cover, and an upper pressure cover. The left and right covers are respectively bolted to both ends of the valve body, and the upper pressure cover is bolted to the top of the valve body. The upper and lower valve sealing covers are installed inside the valve body, forming a sealed valve cavity structure in conjunction with the valve body. The cavity adopts a combined sealing design, achieving multi-dimensional sealing through bolt fixation to ensure the cavity's airtightness.

[0011] Furthermore, both the left and right covers are equipped with protective sleeves to enclose the guide rod and valve plate assembly, in order to prevent coke powder and media corrosion and extend the life of the device.

[0012] Furthermore, both the left and right valve plate assemblies include valve plates, within which a flow-limiting valve sleeve and a flow-limiting small piston are sequentially fitted, with a small gap between them. The flow-limiting small piston and the flow-limiting valve sleeve move synchronously with the valve plates, assisting the valve plates in finely adjusting the flow gap and enhancing the accuracy of flow control.

[0013] Furthermore, the valve plate is fixedly connected to the guide rod via a positive and negative thread connecting sleeve, and the left and right valve plates are provided with serrated biting parts on their opposite end faces to further bite and break up the blockage.

[0014] Furthermore, the protrusion and groove are formed at the ends of the left and right flow-limiting small pistons, respectively. The protrusion is conical, and the groove is a sealing cover shape adapted to it. Both the protrusion and the groove have holes. The blockage material that has been broken by the bite can fall through the holes under the impact of the connected high-pressure water source and is finally discharged through the outlet.

[0015] Furthermore, the sealing element adopts a Y-type sealing ring, which has reliable sealing performance and can effectively prevent coke leakage, especially suitable for reciprocating motion sealing scenarios.

[0016] Furthermore, the drive mechanism adopts an electro-hydraulic actuator, which has the characteristics of high load, high stability and high power density, high control precision and fast dynamic response. It can respond quickly when the flow rate fluctuates drastically in the early stage of decoking to avoid blockage, thus significantly improving energy efficiency and reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 for Figure 1 Enlarged view of section A in the middle; Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model; The attached diagram lists the components represented by each number as follows: 1. Valve body assembly; 2. Left valve plate assembly; 3. Right valve plate assembly; 4. Guide rod; 5. Drive mechanism; 6. Seal; 7. Protective sleeve; 8. Secondary anti-clogging mechanism; 9. Flushing port; 10. Water outlet; 11. Valve body; 12. Left cover; 13. Right cover; 14. Upper valve sealing cover; 15. Lower valve sealing cover; 16. Upper pressure cover; 21. Valve plate; 22. Flow limiting valve sleeve; 23. Flow limiting small piston; 24. Positive and negative thread connecting sleeve; 25. Serrated interlocking part; 81. Protrusion; 82. Groove; 83. Hole. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of this application, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0021] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" or "below" of other elements or features will be oriented "above" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0022] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0023] Example 1 like Figure 1 , Figure 2 As shown, this embodiment provides a continuous flow-controlled, closed-loop decoking device with flow-limiting and anti-clogging features, including a flow-limiting valve and a secondary anti-clogging mechanism 8 disposed inside the flow-limiting valve. Specifically: The flow-limiting valve includes a valve body assembly 1, which has a closed valve cavity structure. A left valve plate assembly 2 and a right valve plate assembly 3 are coaxially arranged in the valve cavity. Guide rods 4 are fixedly connected to the left and right valve plate assemblies respectively. The two guide rods 4 pass through the valve cavity from both ends along the axial direction and are fixedly connected to the drive mechanism 5. The left and right valve plate assemblies can move synchronously towards or away from each other along the axial direction in the valve cavity under the drive of the drive mechanism 5, thereby changing the distance between them through axial movement and forming an adjustable flow channel between them. An inlet and an outlet are respectively opened on both sides of the flow channel in the middle of the valve cavity. The inlet and outlet are connected through the flow channel. The valve cavity can be connected to the coking system conveying pipeline through the inlet and outlet. The left valve plate assembly 2, the right valve plate assembly 3, the guide rods 4 and the inner wall of the valve cavity are all sealed by sealing elements 6.

[0024] In this embodiment, the valve body assembly 1 includes a valve body 11, a left cover 12, a right cover 13, an upper valve sealing cover 14, a lower valve sealing cover 15, and an upper pressure cover 16. The left cover 12 and the right cover 13 are respectively fixed to the two ends of the valve body 11 by bolts. The upper pressure cover 16 is fixed to the upper part of the valve body 11 by bolts. The upper valve sealing cover 14 and the lower valve sealing cover 15 are installed inside the valve body 11. The upper valve sealing cover 14 and the lower valve sealing cover 15 cooperate with the valve body 11 to form a sealed valve cavity structure. The cavity adopts a combined sealing design, and multi-dimensional sealing is achieved by bolt fixing to ensure the cavity sealing performance.

[0025] In this embodiment, both the left cover 12 and the right cover 13 are provided with protective sleeves 7. The protective sleeves 7 can be flexible protective bags to wrap the guide rod 4 and the valve plate assembly to prevent coke powder and media corrosion and extend the life of the device.

[0026] In this embodiment, both the left valve plate assembly 2 and the right valve plate assembly 3 include a valve plate 21. A flow-limiting valve sleeve 22 and a flow-limiting small piston 23 are sequentially fitted inside the valve plate 21, with a small gap between them. The flow-limiting small piston 23 and the flow-limiting valve sleeve 22 move synchronously with the valve plate 21, assisting the valve plate 21 in finely adjusting the flow gap and enhancing the flow control accuracy.

[0027] In this embodiment, the valve plate 21 is fixedly connected to the guide rod 4 through the positive and negative thread connecting sleeve 24. The left and right valve plates are provided with serrated biting parts 25 on their opposite end faces to further bite and break up the blockage.

[0028] In this embodiment, the sealing element 6 adopts a Y-type sealing ring, which has reliable sealing performance and can effectively prevent coke leakage, and is especially suitable for reciprocating motion sealing scenarios.

[0029] In this embodiment, the drive mechanism 5 adopts an electro-hydraulic actuator (EHA). The electro-hydraulic actuator has the characteristics of high load, high stability and high power density, high control accuracy and fast dynamic response. It can respond quickly when the flow rate fluctuates drastically in the early stage of decoking to avoid blockage, and significantly improve energy efficiency and reliability.

[0030] The secondary anti-blocking mechanism 8 includes a protrusion 81 and a groove 82 respectively located at the ends of the left and right valve plate assemblies. The protrusion 81 and the groove 82 can bite and break the blockage material through high-frequency action driven by the left and right valve plate assemblies.

[0031] In this embodiment, the protrusion 81 and the groove 82 are respectively formed at the ends of the left and right flow-limiting small pistons. The protrusion 81 is conical, and the groove 82 is a sealing cover shape that matches it. Both the protrusion 81 and the groove 82 are provided with holes 83. The structure of the protrusion 81 and the groove 82 is defined. The conical and cover-shaped structure enhances the effect of breaking up the blockage material. During high-frequency engagement, it can more efficiently tear and crush the coke blocks. The opening design allows the small particles of blockage material after crushing to be discharged through the outlet (especially when flushed by high-pressure water flow), avoiding secondary accumulation, improving the continuity of anti-blocking and the cleanliness of the valve cavity, and ensuring long-term stable operation. It is especially suitable for decoking scenarios containing large coke blocks.

[0032] The working principle of the above structure: During operation, after receiving an external control signal (the control end of the electro-hydraulic actuator can be connected to an external control system), the drive mechanism 5 (electro-hydraulic actuator) drives the guide rod 4 to move the left valve plate assembly 2 and the right valve plate assembly 3 synchronously towards or away from each other along the axial direction in the valve cavity. This changes the flow channel area to achieve precise flow restriction, control the instantaneous flow rate at the beginning of decoking, and prevent coke blockage due to overload, thus forming a first-level flow restriction and anti-blocking function (flow regulation prevention). When there is blockage in the valve cavity, the protrusions 81 and grooves 82 at the ends of the left and right valve plate assemblies engage with the valve plate assembly at high frequency as it moves, breaking up the blockage and achieving active clearing, thus forming a second-level anti-blocking function (physical intervention removal). At the same time, the serrated engagement parts 25 of the left and right valve plates further break up the residual blockage, the sealing element 6 (Y-type sealing ring) ensures the sealing of the valve cavity, and the protective sleeve 7 prevents coke powder erosion. Ultimately, the "precise flow restriction + active anti-blocking" function is achieved, solving the overload and blockage problems at the beginning of decoking.

[0033] This embodiment upgrades the traditional flow-limiting valve, which relies solely on passive fluid pressure for movement, to a controllable flow-limiting valve that can be precisely adjusted manually, by connecting the valve plate assembly to the drive mechanism. By adding a secondary anti-clogging mechanism within the flow-limiting valve, active anti-clogging is achieved through the high-frequency action of the concave-convex structure to bite and break up the blockage material. This is the first time a dual-stage flow-limiting and anti-clogging structure of "flow-limiting valve - secondary anti-clogging mechanism" has been proposed, effectively solving the problem of instantaneous overload in the initial stage of decoking, significantly reducing the risk of blockage, and improving sealing performance and flow control accuracy.

[0034] Example 2 It is basically the same as Example 1, except that: The valve cavity is provided with a flushing port 9 and a water outlet 10 on the upper and lower sides respectively. The flushing port 9 is connected to an external high-pressure water source, and both the flushing port 9 and the water outlet 10 are connected to the valve cavity.

[0035] By connecting to a high-pressure water source, the valve chamber can be flushed in real time or periodically, further preventing the accumulation of coke suspended particles and high-viscosity media in the valve chamber and thus preventing blockage, thereby improving flow control accuracy. Combined with a secondary anti-blocking mechanism, this forms a multi-layered anti-blocking system of "crushing + flushing," reducing the probability of valve chamber blockage, extending equipment maintenance cycles, and adapting to high-temperature, high-viscosity coke slurry conditions.

[0036] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A continuous flow-controlled, closed-loop decoking device for limiting flow and preventing blockage, characterized in that, Includes a flow-limiting valve and a secondary anti-blocking mechanism located inside the flow-limiting valve; The flow limiting valve includes a valve body assembly, which has a closed valve cavity structure. A left valve plate assembly and a right valve plate assembly are coaxially arranged in the valve cavity. Guide rods are fixedly connected to the left and right valve plate assemblies respectively. The two guide rods pass through the valve cavity from both ends along the axial direction and are fixedly connected to the drive mechanism. The left and right valve plate assemblies can move synchronously towards or away from each other along the axial direction in the valve cavity under the drive mechanism. The axial movement changes the distance between them, forming an adjustable flow channel between them. The left valve plate assembly, the right valve plate assembly, the guide rods and the inner wall of the valve cavity are all sealed by sealing elements. The secondary anti-blocking mechanism includes protrusions and grooves located at the ends of the left and right valve plate assemblies, which can bite and break up the blockage material under the action of the left and right valve plate assemblies.

2. The continuous flow-controlled closed decoking device for preventing blockage according to claim 1, characterized in that, The valve cavity has an inlet and an outlet on both sides of the flow channel in the middle, and the inlet and outlet are connected through the flow channel.

3. The continuous flow-controlled closed decoking device for limiting flow and preventing blockage according to claim 1, characterized in that, The valve cavity is provided with a flushing port and a water outlet on the upper and lower sides, respectively. The flushing port is connected to an external high-pressure water source, and both the flushing port and the water outlet are connected to the valve cavity.

4. The continuous flow-controlled closed decoking device for preventing blockage according to claim 1, characterized in that, The valve body assembly includes a valve body, a left cover, a right cover, an upper valve sealing cover, a lower valve sealing cover, and an upper pressure cover. The left cover and the right cover are respectively sealed and fixed at both ends of the valve body by bolts. The upper pressure cover is sealed and fixed at the top of the valve body by bolts. The upper valve sealing cover and the lower valve sealing cover are installed inside the valve body, which cooperate with the valve body to form a sealed valve cavity structure.

5. The continuous flow-controlled closed decoking device for preventing blockage according to claim 4, characterized in that, Both the left and right covers are equipped with protective sleeves.

6. The continuous flow-controlled closed coking and anti-clogging device according to claim 1, characterized in that, Both the left valve plate assembly and the right valve plate assembly include valve plates, and a flow-limiting valve sleeve and a flow-limiting small piston are sequentially installed inside the valve plates, with a small gap between them.

7. The continuous flow-controlled closed coking and anti-clogging device according to claim 6, characterized in that, The valve plate is fixedly connected to the guide rod through a positive and negative thread connecting sleeve, and a serrated engagement part is provided on the opposite end face of the left and right valve plates.

8. The continuous flow-controlled closed coking and anti-clogging device according to claim 1, characterized in that, The protrusion and groove are formed at the ends of the left and right flow-limiting small pistons, respectively. The protrusion is cone-shaped, and the groove is a sealing cover shape that matches it. Both the protrusion and the groove have holes.

9. A continuous flow-controlled, closed-loop decoking device for limiting current and preventing blockage according to claim 1, characterized in that, The sealing element is a Y-type sealing ring.

10. A continuous flow-controlled, sealed coke removal device for limiting flow and preventing blockage according to claim 1, characterized in that, The drive mechanism uses an electro-hydraulic actuator.

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