A multi-stage segmented flow-restricting system for continuous flow control of closed decoking

Abstract

The utility model relates to a continuous flow control type closed decoking multistage sectional type flow limiting system, including multistage sectional type flow limiting subsystem, drive subsystem and control system, the multistage sectional type flow limiting subsystem includes a plurality of series connection's flow limiting valve, to realize the sectional control flow of coke, every flow limiting valve is connected a drive subsystem respectively, and the opening degree regulation is realized by drive subsystem drive, all drive subsystems are connected control system, and the multistage coordinated linkage control is realized by control system. Through setting up a plurality of series connection's flow limiting valve, makes between the adjacent two flow limiting valve can form the buffer area, gradually slows down the coke water pressure, and then reduces the flow limiting valve sealing surface coke particle wear and tear and water flow scouring deformation, reduces the seal failure risk, prolongs the life of flow limiting valve sealing surface, reduces the impact to the subsequent equipment, simultaneously, through the linkage adjustment each flow limiting valve's opening degree, realizes the coke water and the sectional control flow of coke block.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical equipment technology, specifically to a multi-stage segmented flow limiting system for continuous flow control type closed coke removal. Background Technology

[0002] Continuous flow-controlled closed decoking systems (existing technology) are of great importance in the field of delayed coking in petroleum refining. In the process of handling high-temperature coke, traditional closed decoking systems carry a large amount of oily, sulfurous wastewater and volatile harmful substances in the cold coke water and overflow water, which causes significant pollution to the ecological environment.

[0003] Existing closed coking systems mainly employ a combination of a tower-bottom crusher and a dewatering chamber for transfer. A hydraulic lifting sealing sleeve is installed below the coke tower, and this sleeve is connected to a screening conveyor via a single flow-limiting valve. The screening conveyor is then connected to the crusher and the dewatering chamber. The flow-limiting valve is used to precisely regulate the coke discharge flow rate, preventing excessive instantaneous flow velocity from clogging subsequent equipment.

[0004] However, the core technical challenges of using flow restrictors independently mainly stem from the challenges posed by high-particle media and high-pressure environments, specifically including: 1. The sealing surface of the flow restrictor valve is easily deformed due to wear from coke particles or erosion by water flow, leading to failure and leakage, and posing a risk of seal failure. 2. Impurities (such as suspended coke particles) accumulate in the valve cavity, hindering the movement of the valve plate, causing jamming, and affecting the accuracy of flow control; 3. The valve plate is prone to cracks or failure at the connection points due to abnormal pressure rise. Utility Model Content

[0005] This invention addresses the technical problems existing in the prior art by providing a multi-stage segmented flow limiting system for continuous flow control and sealed decoking.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A multi-stage segmented flow limiting system for continuous flow control and closed coking removal includes a multi-stage segmented flow limiting subsystem, a drive subsystem, and a control subsystem. The multi-stage segmented flow limiting subsystem includes multiple flow limiting valves connected in series to achieve segmented flow control of the coke space. Each flow limiting valve is connected to a drive subsystem, which drives the valve to adjust its opening. All drive subsystems are connected to the control subsystem, which enables multi-stage coordinated control.

[0007] The beneficial effects of this utility model are: By setting up multiple flow-limiting valves in series, a buffer zone can be formed between adjacent flow-limiting valves, gradually reducing the pressure of coke water. This disperses the sealing pressure and wear on individual valves during flow regulation, breaking through the traditional single flow-limiting valve design mode. It reduces coke particle wear and water flow erosion deformation on the sealing surface of the flow-limiting valve, lowers the risk of seal failure, extends the life of the sealing surface of the flow-limiting valve, and reduces the impact on downstream equipment. It also reduces the possibility of flow-limiting valves breaking due to abnormal pressure rise or material fatigue. Furthermore, it reduces the accumulation of coke suspended particles in the valve cavity, lowering the probability of blockage. Moreover, the adjustment of subsequent valves compensates for the insufficient opening of the initial valve, reducing jamming caused by the opening problem of a single valve and improving the accuracy of flow control. At the same time, by adjusting the opening of each flow-limiting valve in a coordinated manner, multi-stage flow restriction works together to achieve graded and segmented flow control of coke water and coke lumps.

[0008] Furthermore, the drive subsystem can employ an electro-hydraulic actuator, which offers high control precision, fast dynamic response, and a high degree of integration, simplifying the system structure.

[0009] Furthermore, each of the drive subsystems includes two electro-hydraulic actuators, which are connected to the microcontroller via circuits. The two electro-hydraulic actuators can operate synchronously under the control of the microcontroller.

[0010] Furthermore, the control subsystem can be equipped with a microcontroller, which offers high flexibility and scalability while maintaining low cost.

[0011] Furthermore, the multiple flow-limiting valves are connected by delivery pipelines.

[0012] Furthermore, the multiple flow-limiting valves are arranged at equal or unequal intervals, and there is no restriction on the spacing between the flow-limiting valves.

[0013] Furthermore, the flow-limiting valve includes a valve body assembly with a closed chamber structure inside. A left valve plate and a right valve plate are coaxially arranged within the chamber, and guide rods are fixedly connected to each valve plate. The two guide rods extend axially from both ends of the chamber and are fixedly connected to an electro-hydraulic actuator. Driven by the electro-hydraulic actuator, the left and right valve plates can move synchronously towards or away from each other axially within the chamber, thereby changing the distance between them and forming an adjustable flow channel. An inlet and an outlet are respectively opened on both sides of the flow channel in the middle of the chamber, connected through the flow channel. Sealing rings are provided between the left and right valve plates, the guide rods, and the inner wall of the chamber. By providing a closed chamber through the valve body assembly and driving the left and right valve plates within the chamber through the electro-hydraulic actuator, flow regulation and active unblocking are achieved. Employing a design where left and right valve plates move synchronously in opposite directions, the flow channel area is directly adjusted by changing the distance between them. Compared to traditional single-valve-plate sliding or rotary adjustment, this design offers a wider adjustment range, and the flow area is linearly related to the valve plate displacement, facilitating precise flow control. Driven by an electro-hydraulic actuator, it combines the high thrust of hydraulic drive with the high precision of electric control, enabling rapid response to adjustment commands and making it suitable for scenarios sensitive to flow changes.

[0014] 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 complete sealed chamber structure with the valve body. The chamber adopts a combined sealing design, achieving multi-dimensional sealing through bolt fixation to ensure the chamber's airtightness. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the flow limiting valve structure of this utility model; The attached diagram lists the components represented by each number as follows: 1. Primary flow restrictor valve; 2. Secondary flow restrictor valve; 3. Tertiary flow restrictor valve; 4. Electro-hydraulic actuator; 5. Delivery pipeline; 11. Left valve plate; 12. Right valve plate; 13. Guide rod; 14. Flow passage; 15. Valve body; 16. Left cover; 17. Right cover; 18. Upper valve sealing cover; 19. Lower valve sealing cover; 20. Upper pressure cover; 21. Sealing ring. Detailed Implementation

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Example 1 like Figure 1 As shown, this embodiment provides a multi-stage segmented current limiting system for continuous flow control and sealed decoking, including a multi-stage segmented current limiting subsystem, a drive subsystem, and a control subsystem. Specifically: The multi-stage segmented flow limiting subsystem includes multiple flow limiting valves connected in series (in this embodiment, three flow limiting valves connected in series are taken as an example, such as...). Figure 1 The primary flow restrictor 1, secondary flow restrictor 2, and tertiary flow restrictor 3 shown in the diagram form a segmented flow control system for coke in space. These flow restrictors are connected by a conveying pipeline 5; that is, the outlet of the primary flow restrictor 1 is connected to the inlet of the secondary flow restrictor 2 via the conveying pipeline 5, and the outlet of the secondary flow restrictor 2 is connected to the inlet of the tertiary flow restrictor 3 via the conveying pipeline 5. The flow restrictors can be arranged with equal or unequal spacing. There is no restriction on the spacing between the flow restrictors; equal spacing is more suitable for straight pipelines, while unequal spacing is more suitable for space-constrained scenarios.

[0022] Each of the flow-limiting valves is connected to a drive subsystem, which drives the valve to adjust its opening. The drive subsystem can employ an electro-hydraulic actuator 4, which offers high control precision, fast dynamic response, and high integration, simplifying the system structure. In this embodiment, each drive subsystem includes two electro-hydraulic actuators (EHAs). The controllers of the electro-hydraulic actuators are connected to the control subsystem via wiring, allowing the two actuators to operate synchronously under the control of the control subsystem.

[0023] All drive subsystems are connected to the control subsystem, which enables multi-level coordinated control. The control subsystem can employ any type of controller, as long as it can achieve the coordinated control function. In this embodiment, the control subsystem uses a microcontroller (not shown in the figure), which offers high flexibility, scalability, and low cost.

[0024] The working principle of the above structure: During operation, first open the primary flow limiting valve 1 and close the other flow limiting valves. Once the primary flow limiting is stable, gradually increase the opening of the primary flow limiting valve 1. Simultaneously, a buffer zone is formed between the primary flow limiting valve 1 and the next-stage flow limiting valve (secondary flow limiting valve 2). When the opening of the primary flow limiting valve 1 exceeds 50% (based on the nonlinearity of the flow characteristic curve, the flow limiting valve plate is only sensitive to flow regulation near the 50% closed position; control accuracy is poor at other positions. The opening of the flow limiting valve can be determined by installing a position transmitter on the valve body assembly and connecting the position transmitter to the valve plate, using the position transmitter to measure the valve plate displacement), open the secondary flow limiting valve 2. As the chamber containing the secondary flow limiting valve gradually fills, increase the opening of the secondary flow limiting valve 2. At this time, a buffer zone is also formed between the secondary flow limiting valve 2 and the tertiary flow limiting valve 3. The final opening of the secondary flow limiting valve 2 can be greater than the opening of the primary flow limiting valve 1. As the material flows, when it enters the third-stage flow restriction valve, the pressure has been greatly reduced. The opening of the third-stage flow restriction valve can be adjusted according to the actual situation. Even if it is fully open, it will not cause impact on subsequent equipment.

[0025] This embodiment, by setting up multiple flow-limiting valves in series, creates a buffer zone between adjacent valves, gradually reducing the pressure of coke water. This disperses the sealing pressure and wear on individual valves during flow regulation, breaking through the traditional single-valve design. It reduces coke particle wear and water erosion deformation on the valve sealing surface, lowers the risk of seal failure, extends the lifespan of the valve sealing surface, and reduces the impact on downstream equipment. It also reduces the possibility of flow-limiting valves breaking due to abnormal pressure increases or material fatigue. Furthermore, it reduces the accumulation of coke suspended particles in the valve cavity, lowering the probability of blockage. Moreover, the adjustment of subsequent valves compensates for insufficient opening in the early stages, reducing jamming caused by single valve opening issues and improving flow control accuracy. This is significant for the impact load, fault diagnosis, maintenance, and safety of individual flow-limiting valves. Simultaneously, by adjusting the opening of each flow-limiting valve in a coordinated manner, multi-stage flow restriction works collaboratively, achieving graded and segmented flow control of coke water and coke lumps, preventing blockage in downstream equipment and reducing the load on the equipment.

[0026] Example 2 It is basically the same as Example 1, except that: This embodiment provides the specific structure of the flow limiting valve. For example... Figure 2As shown, the flow limiting valve includes a valve body assembly, which has a closed chamber structure inside. A left valve plate 11 and a right valve plate 12 are coaxially arranged in the chamber. Guide rods 13 are fixedly connected to the left and right valve plates respectively. The two guide rods 13 pass through the two ends of the chamber along the axis and are fixedly connected to the electro-hydraulic actuator 4. The left and right valve plates can move synchronously towards or away from each other along the axis in the chamber under the drive of the electro-hydraulic actuator 4. The axial movement changes the distance between the left valve plate 11 and the right valve plate 12, forming an adjustable flow channel 14 between them. An inlet and an outlet are respectively opened on both sides of the flow channel 14 in the middle of the chamber. The inlet and outlet are connected through the flow channel 14. A sealing ring (Y-type sealing ring) 21 is provided between the left valve plate 11, the right valve plate 12, the guide rods 13 and the inner wall of the chamber. The valve body assembly includes a valve body 15, a left cover 16, a right cover 17, an upper valve sealing cover 18, a lower valve sealing cover 19, and an upper pressure cover 20. The left cover 16 and the right cover 17 are respectively fixed to the two ends of the valve body 15 by bolts. The upper pressure cover 20 is fixed to the upper part of the valve body 15 by bolts. The upper valve sealing cover 18 and the lower valve sealing cover 19 are installed inside the valve body 15, which cooperate with the valve body 15 to form a complete sealed chamber structure.

[0027] Employing a design where left and right valve plates move synchronously in opposite directions, the flow channel area is directly adjusted by changing the distance between them. Compared to traditional single-valve-plate sliding or rotary adjustment, this design offers a wider adjustment range (continuously adjustable from fully closed to maximum opening), and the flow area is linearly related to the valve plate displacement, facilitating precise flow control. Simultaneously, the high-frequency movements of the left and right valve plates can break up blockages, actively clearing deposits from the valve cavity. Driven by an electro-hydraulic actuator (EHA), it combines the high thrust of hydraulic drive with the high precision of electric control, enabling rapid response to adjustment commands (millisecond-level dynamic response), making it suitable for applications sensitive to flow changes (such as precision hydraulic systems and fluid metering equipment).

[0028] The chamber adopts a combined sealing design, which achieves multi-dimensional sealing through bolt fixation to ensure the chamber's airtightness and facilitates assembly and maintenance. The left and right valve plates, guide rods, and inner walls of the chamber are all equipped with sealing rings, forming a dual protection of "dynamic sealing + static sealing": when the valve plate moves, the sealing rings maintain a dynamic seal with the chamber wall, and the guide rod protrusion part is sealed with a sealing ring to prevent fluid leakage from the chamber, which is suitable for high-pressure fluid scenarios (such as hydraulic oil and high-pressure water).

[0029] The left and right valve plates are arranged coaxially, and the guide rods extend symmetrically from both ends of the chamber. They are connected to the electro-hydraulic actuators through the guide rods. The electro-hydraulic actuators are driven synchronously, which can avoid uneven wear or jamming caused by the valve plate being subjected to force on one side, and extend the service life of the seals and valve body. At the same time, the actuators are installed on the outside of the chamber, which can avoid direct contact between them and the fluid inside the chamber, making them more adaptable to complex environments.

[0030] The flow channel is located in the middle of the chamber and is dynamically formed by the left and right valve plates. Its flow area adjustment is more linear and it is not easily blocked by impurities (larger particles can pass through when the channel is fully open). The inlet and outlet are symmetrically distributed on both sides of the flow channel, so the pressure distribution is more uniform when the fluid flows through, reducing turbulence and pressure loss.

[0031] Because of the multi-stage flow limiting valve series design, the requirements for shock resistance and wear of the flow limiting valves decrease as the series progresses, and the control accuracy requirements also decrease. Therefore, the choices of structural design, materials, and automation components can be different, which can better control costs and reduce design and manufacturing difficulties.

[0032] 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 multi-stage segmented flow limiting system for continuous flow control type closed decoking, characterized in that, It includes a multi-stage segmented flow limiting subsystem, a drive subsystem, and a control subsystem; the multi-stage segmented flow limiting subsystem includes multiple flow limiting valves connected in series to achieve segmented flow control in the coke space; each flow limiting valve is connected to a drive subsystem, which drives the valve to adjust its opening; all drive subsystems are connected to the control subsystem, which enables multi-stage coordinated control.

2. The multi-stage segmented flow limiting system for continuous flow control and sealed coking removal according to claim 1, characterized in that, The drive subsystem employs an electro-hydraulic actuator.

3. The multi-stage segmented flow limiting system for continuous flow control and sealed coking removal according to claim 2, characterized in that, Each of the drive subsystems includes two electro-hydraulic actuators, the controllers of which are connected to the control subsystem via wiring.

4. The multi-stage segmented flow limiting system for continuous flow control and sealed coking removal according to claim 1, characterized in that, The control subsystem uses a microcontroller.

5. The multi-stage segmented flow limiting system for continuous flow control and sealed coking removal according to claim 1, characterized in that, The multiple flow-limiting valves are connected by a delivery pipeline.

6. The multi-stage segmented flow limiting system for continuous flow control and sealed coking removal according to claim 1, characterized in that, The multiple flow-limiting valves are arranged at equal or unequal intervals.

7. The multi-stage segmented flow limiting system for continuous flow control and sealed coking removal according to claim 1, characterized in that, The flow limiting valve includes a valve body assembly with a closed chamber structure inside. A left valve plate and a right valve plate are coaxially arranged in the chamber. Guide rods are fixedly connected to the left and right valve plates respectively. The two guide rods pass through the two ends of the chamber along the axis and are fixedly connected to an electro-hydraulic actuator. The left and right valve plates can move synchronously towards or away from each other along the axis in the chamber under the drive of the electro-hydraulic actuator. The axial movement changes the distance between the left and right valve plates, 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 chamber. The inlet and outlet are connected through the flow channel. Sealing rings are provided between the left valve plate, the right valve plate, the guide rods and the inner wall of the chamber.

8. A multi-stage segmented flow limiting system for continuous flow control and sealed coking removal according to claim 7, 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 chamber structure.

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