A continuous flow-limiting gate for closed decoking

Abstract

The utility model relates to a continuous closed decoking flow limiting gate, including arc shaped coke chute channel, arc shaped gate, arc shaped gate drive mechanism, flat gate, flat gate drive mechanism, sealing element, arc shaped gate rotates and is installed in arc shaped coke chute channel through pivot in the corresponding channel entrance, and arc shaped gate bottom is provided with flow limiting mouth, and pivot connects arc shaped gate drive mechanism, flat gate is installed on arc shaped gate through guide sliding mechanism, and can cooperate flow limiting with flow limiting mouth, and flat gate top connects flat gate drive mechanism, and arc shaped gate end and flow limiting mouth inner wall all are equipped with sealing element. The application controls arc shaped coke chute channel total opening and closing through arc shaped gate, and through flat gate and flow limiting mouth forms small diameter channel, can cope with instantaneous large flow when drilling and breaking through and balanced small flow when cutting coke simultaneously, solves the adaptation defect of traditional fixed throttle device one hole fixed flow thoroughly, avoids the impact of flow sudden change to equipment.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical equipment technology, specifically to a continuous closed decoking flow limiting gate. Background Technology

[0002] In the decoking operation of the coke tower in a delayed coking unit, the flow fluctuation of coke and cutting fluid discharged from the bottom outlet of the coke tower is a particularly prominent issue. At the moment the borehole is drilled, the coke fluid pours down through the coke chute in a very short time, with an instantaneous flow rate reaching tens of thousands of cubic meters per hour; however, after entering the coke cutting process, the coke fluid flow rate becomes smaller and more uniform. This drastic flow fluctuation can cause multiple problems for the coke chute and subsequent systems. When the flow rate is too high, the velocity of the coke fluid mixture increases, exacerbating the scouring and wear of the inner wall of the coke chute by high-speed coke lumps, shortening equipment lifespan. When the flow rate is too low, the velocity of the coke lumps decreases, increasing the risk of their gravity deposition and accumulation in the chute, and in severe cases, even completely blocking the channel, seriously affecting the operating efficiency of the unit. Traditional flow-limiting devices struggle to effectively address the series of problems caused by the aforementioned flow fluctuations. Most traditional devices employ a "throttling baffle" structure, limiting the maximum flow rate through a fixed orifice diameter. However, this fixed orifice diameter results in extremely poor adaptability, making it impossible to dynamically adjust the flow rate according to changes in operating conditions at different stages of the decoking process, thus failing to meet actual operational needs.

[0003] Therefore, a dedicated adaptive gate is urgently needed to solve these problems. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing a continuous, sealed, flow-limiting gate for decoking.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A continuous, sealed coke removal flow-limiting gate includes an arc-shaped coke chute channel, an arc-shaped gate, an arc-shaped gate drive mechanism, a flat gate, a flat gate drive mechanism, and sealing elements. The arc-shaped gate is rotatably installed in the arc-shaped coke chute channel at the corresponding channel entrance via a rotating shaft. A flow-limiting port is opened at the bottom of the arc-shaped gate, and the rotating shaft is connected to the arc-shaped gate drive mechanism. The flat gate is installed on the arc-shaped gate via a guide sliding mechanism and can cooperate with the flow-limiting port to limit flow. The top of the flat gate is connected to the flat gate drive mechanism. Sealing elements are provided at the ends of the arc-shaped gate and on the inner wall of the flow-limiting port.

[0006] The beneficial effects of this utility model are: The arc-shaped gate controls the overall opening and closing of the channel, while the flat gate and the flow-limiting port work together to precisely adjust the opening. This allows for simultaneous handling of the instantaneous large flow rate during drilling and the balanced small flow rate during coke cutting, completely solving the adaptation defects of traditional fixed flow-limiting devices that rely on a fixed flow rate per hole. This avoids the impact of sudden flow changes on the equipment. At the same time, both the end of the arc-shaped gate and the inner wall of the flow-limiting port are equipped with seals. This prevents coke from leaking from the gap between the gate and the channel when the arc-shaped gate is closed, and also avoids dead zones in the seal when the flat gate and the flow-limiting port work together. This eliminates the risk of burns and environmental pollution caused by high-temperature coke leakage, and improves operational safety.

[0007] Furthermore, the arc-shaped coke chute channel includes a frame, a coke chute, and a sealing cover. The coke chute is fixedly installed on the top of the frame and is fixedly connected to the sealing cover via a flange. The frame provides stable support for the entire device, preventing the coke chute from vibrating and shifting due to the impact of coke liquid. The coke chute and the sealing cover are connected by a flange to form a closed space, isolating the coke liquid from contact with the outside world, preventing coke liquid from splashing and polluting the environment, and also reducing the entry of airborne impurities into the channel.

[0008] Furthermore, the coke chute has a carbon steel shell with a wear-resistant ceramic coating on the inner wall, which specifically solves the problem of equipment wear.

[0009] Furthermore, the arc-shaped gate is a carbon steel structural component, which is fixedly connected to the rotating shaft by a hinge. The rotating shaft passes through the arc-shaped coke chute channel and is mounted on the frame through bearings and bearing seats.

[0010] Furthermore, the arc-shaped gate drive mechanism includes a servo motor or hydraulic motor, a drive gear, a transmission gear, and a drive swing arm. The servo motor or hydraulic motor is fixedly mounted on the frame, its output shaft is fixedly connected to the drive gear, the drive gear meshes with the transmission gear, the transmission gear is fixedly connected to the drive swing arm, and the drive swing arm is fixedly connected to the rotating shaft. The arc-shaped gate drive mechanism enables precise and efficient control.

[0011] Furthermore, rollers are fixed on both sides of the flat gate to directly optimize its sliding performance.

[0012] Furthermore, the guide sliding mechanism includes a gate frame fixed to the arc-shaped gate, with a hydraulic cylinder bracket fixed to the top of the gate frame and a sliding groove at the bottom for cooperation with rollers. The guide sliding mechanism ensures stable operation of the flat gate.

[0013] Furthermore, the flat gate drive mechanism includes a hydraulic cylinder, with both ends hinged to the cylinder bracket and the flat gate, respectively. This drive method can adapt to the adjustment requirements of the flat gate.

[0014] Furthermore, the sealing element adopts a P-type sealing strip to ensure sealing performance. Attached Figure Description

[0015] Figure 1 , Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure after removing the arc-shaped coke chute channel in an embodiment of the present invention; Figure 4 This is a schematic diagram of the guide sliding mechanism structure according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the initial water stage in an embodiment of this utility model; Figure 6 This is a structural schematic diagram of the drilling and drainage scenario in Embodiment 1 of this utility model; Figure 7 This is a structural diagram of a coke cutting operation scenario according to an embodiment of this utility model; The attached diagram lists the components represented by each number as follows: 1. Arc-shaped coke chute channel; 11. Frame; 12. Coke chute; 13. Sealing cover; 2. Arc-shaped gate; 21. Flow restriction port; 3. Arc-shaped gate drive mechanism; 31. Servo motor or hydraulic motor; 32. Drive gear; 33. Transmission gear; 34. Drive swing arm; 4. Flat gate; 41. Roller; 5. Flat gate drive mechanism; 6. Seal; 7. Rotating shaft; 8. Guide sliding mechanism; 81. Gate frame; 82. Hydraulic cylinder bracket; 83. Slide groove; 9. Hinge; 10. Bearing seat. 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] like Figures 1 to 4As shown, this embodiment provides a continuous sealed coke removal flow-limiting gate, including an arc-shaped coke chute channel 1, an arc-shaped gate 2, an arc-shaped gate drive mechanism 3, a flat gate 4, a flat gate drive mechanism 5, and a sealing element 6. The arc-shaped gate 2 is rotatably installed in the arc-shaped coke chute channel 1 at the corresponding channel entrance via a rotating shaft 7. A flow-limiting port 21 is opened at the bottom of the arc-shaped gate 2, and the rotating shaft 7 is connected to the arc-shaped gate drive mechanism 3. The flat gate 4 is installed on the arc-shaped gate 2 via a guide sliding mechanism 8 and can cooperate with the flow-limiting port 21 to limit the flow. The top of the flat gate 4 is connected to the flat gate drive mechanism 5. Sealing elements 6 are provided at the ends of the arc-shaped gate 2 and on the inner wall of the flow-limiting port 21. In this embodiment, the arc-shaped gate 2 controls the overall opening and closing of the channel. The flat gate 4 and the flow-limiting port 21 cooperate to form a small-diameter channel, which can simultaneously handle the instantaneous large flow rate when drilling is completed and the balanced small flow rate when cutting coke. This completely solves the adaptation defect of the traditional fixed flow-limiting device of "one hole fixed flow rate" and avoids the impact of sudden flow changes on the equipment. Moreover, the ends of the arc-shaped gate 2 and the inner wall of the flow-limiting port 21 are equipped with sealing elements 6, which not only prevents coke from leaking from the gap between the gate and the channel when the arc-shaped gate 2 is closed, but also avoids the sealing dead angle when the flat gate 4 and the flow-limiting port 21 are in contact, eliminating the risk of burns and environmental pollution caused by high-temperature coke leakage and improving operational safety. At the same time, the arc-shaped gate 2 is integrated into the channel entrance through the rotating shaft 7, and the flat gate 4 is installed on the arc-shaped gate 2 by means of the guide sliding mechanism 8. The overall structure is modular and does not require occupying a large amount of space on the upper part of the coke chute 12.

[0022] Specifically: The arc-shaped coke chute channel 1 includes a frame 11, a coke chute 12, and a sealing cover 13. The coke chute 12 is fixedly installed on the top of the frame 11 and is fixedly connected to the sealing cover 13 via a flange. The frame 11 provides stable support for the entire device, preventing the coke chute 12 from vibrating and shifting due to the impact of coke liquid. The coke chute 12 and the sealing cover 13 are connected by a flange to form a closed space, isolating the coke liquid from contact with the outside world, preventing coke liquid from splashing and polluting the environment, and reducing the entry of airborne impurities into the channel. Moreover, the flange connection is easy to disassemble, and when checking the wear of the seal 6 or cleaning the residual coke in the chute, it is not necessary to disassemble the entire channel, reducing maintenance time. In this embodiment, the coke chute 12 has a carbon steel shell with a wear-resistant ceramic coating on the inner wall, which specifically solves the problem of equipment wear: the carbon steel shell ensures the overall structural strength of the coke chute 12 and can withstand the long-term impact of high-pressure coke without easily deforming; the ceramic coating on the inner wall has high hardness and is erosion-resistant, which can resist the grinding of the chute wall by high-speed coke blocks; and the surface of the ceramic coating is smooth, so coke blocks are not easy to stick to the chute wall, reducing the risk of blockage caused by coke block accumulation and indirectly improving the continuity of coke removal operation.

[0023] The arc-shaped gate 2 is a carbon steel structural component, fixedly connected to the rotating shaft 7 via a hinge 9. The rotating shaft 7 passes through the arc-shaped coke chute channel 1 and is mounted on the frame 11 via bearings and bearing seats 10. This design improves the operational reliability of the arc-shaped gate 2: the high strength of the carbon steel structural component can withstand the impact of coke water and the torque during its own opening and closing, preventing the gate from deforming and jamming. The hinge 9 connection makes the force on the rotating shaft 7 and the gate more even, reducing damage caused by local stress concentration. At the same time, the rotating shaft 7 is mounted on the frame 11 via bearings and bearing seats 10, converting sliding friction into rolling friction, reducing the resistance when the arc-shaped gate 2 opens and closes. Combined with the drive mechanism, it can achieve fast and smooth switching, reducing flow control delays caused by jamming.

[0024] The arc-shaped gate drive mechanism 3 includes a servo motor or hydraulic motor 31, a drive gear 32, a transmission gear 33, and a drive swing arm 34. The servo motor or hydraulic motor 31 is fixedly mounted on the frame 11, and its output shaft is fixedly connected to the drive gear 32. The drive gear 32 meshes with the transmission gear 33, the transmission gear 33 is fixedly connected to the drive swing arm 34, and the drive swing arm 34 is fixedly connected to the rotating shaft 7. The arc gate drive mechanism 3 can achieve precise and efficient control: the servo motor (or hydraulic motor) outputs a stable speed, and with the deceleration and torque increase effect of the gear transmission, it can accurately control the rotation angle of the drive arm 34, thereby realizing the fine adjustment of the opening of the arc gate 2 (such as the need for a small angle to open the guide when cutting coke), avoiding flow fluctuations caused by insufficient drive precision; and the gear transmission and the torque transmission efficiency of the drive arm 34 are high. Even if the arc gate 2 becomes slightly stuck due to long-term use, it can still be opened and closed with sufficient drive force, which is suitable for the heavy-load scenario in the coke removal operation where "the gate needs to withstand the reaction force of high pressure coke water", reducing the risk of drive mechanism failure.

[0025] Rollers 41 are fixed on both sides of the flat gate 4. This directly optimizes its sliding performance: the sliding friction when the flat gate 4 moves up and down is converted into rolling friction, making the flat gate 4 move more smoothly under the drive of the hydraulic cylinder, reducing the lag in opening adjustment caused by high frictional resistance, and ensuring the timeliness of flow control.

[0026] The guide sliding mechanism 8 includes a gate frame 81, which is fixed to the arc-shaped gate 2 by welding or bolting. A cylinder bracket 82 is fixed to the top of the gate frame 81, and a groove 83 that cooperates with the roller 41 is opened at the bottom. The guide sliding mechanism 8 provides a guarantee for the stable operation of the flat gate 4: under the drive of the flat gate drive mechanism 5, the flat gate 4 moves up and down in the groove 83 using the roller 41, which restricts the flat gate 4 to move only along the groove 83, preventing it from shifting left and right during adjustment, and ensuring that the flat gate 4 is always aligned with the flow restriction port 21 without creating a sealing gap or jamming; and the cylinder bracket 82 is directly fixed to the top of the gate frame 81, eliminating the need for an additional independent support structure for the hydraulic cylinder, making the flat gate, drive mechanism and guide mechanism an integrated module, simplifying the assembly process, improving the overall structural integrity, and reducing component loosening caused by vibration.

[0027] The flat gate drive mechanism 5 includes a hydraulic cylinder, with both ends hinged to the cylinder bracket 82 and the flat gate 4 via pins. This drive method can adapt to the adjustment requirements of the flat gate 4: the hydraulic cylinder has a large output force, and the lifting speed and opening of the flat gate 4 can be smoothly controlled by adjusting the oil pressure, avoiding the gate impacting the flow restriction port 21 due to sudden changes in driving force, and protecting the seal 6 and the gate structure; moreover, the hinged design at both ends allows the hydraulic cylinder to swing slightly when the gate is raised and lowered, compensating for positional deviations caused by changes in the angle of the arc gate 2 or component installation errors, ensuring that the drive mechanism can always effectively transmit power without jamming or damage.

[0028] The sealing element 6 adopts a P-type sealing strip. This improves the sealing reliability and durability: the P-type sealing strip has a "P"-shaped cross-section, which has good elasticity and deformation capacity. When it comes into contact with the sealing surface, it can form multiple sealing contact lines. Compared with ordinary rectangular sealing strips, it can better compensate for the small gaps when the gate is opened and closed. Even if the sealing strip is slightly worn, it can still maintain good sealing performance.

[0029] The working principle of the above structure: The flow-limiting gate in this embodiment can be used in conjunction with the monitoring system (such as a pressure sensor, model YYJ / GY1-1201) and control system (such as a PLC, model DVP15MC11T-06) of the delayed coking unit. The pressure sensor is installed at the front end of the arc-shaped coke chute channel, near the bottom outlet of the coke tower. The output end of the pressure sensor is connected to the input end of the PLC through a wire, and the output end of the PLC is connected to the control end of the hydraulic cylinder, servo motor, or hydraulic motor through a wire, so as to realize safe and efficient control of the decoking process, which can be divided into three core stages: I. Initial Stage: Laying the Foundation for Safe Operation Before drilling operations begin in the coke tower, the unit first enters an initial preparation state. At this time, such as... Figure 5As shown, the arc-shaped gate 2 is completely closed under the control of its drive mechanism (servo motor or hydraulic motor 31), and the flat gate 4 is also completely closed under the action of the corresponding drive mechanism (hydraulic cylinder). The two work together with the sealing cover 13 and the P-type sealing strip to form a sealed space in the arc-shaped coke chute channel 1.

[0030] II. Dynamic Operation Phase: Precise Flow Control Based on Scenarios 1. Drainage scenario: Fine adjustment of small diameter The moment the borehole is completed, a large amount of coke-water mixture rushes into the coke chute 12. At this time, the pressure sensor installed at the front end monitors the water pressure changes in real time and transmits the data to the PLC. Since the arc-shaped gate 2 is still in the closed state (e.g., ... Figure 6 As shown, the coke water needs to be discharged through the small-diameter channel formed by the flat gate 4 and the flow restriction port 21. The PLC judges the flow rate based on the water pressure signal and drives the hydraulic cylinder to adjust the gate opening: if the water pressure is too high (i.e. the flow rate is too large), the flat gate 4 is controlled to reduce the opening to limit the coke water discharge rate; if the water pressure tends to be stable, the current opening is maintained to ensure that the coke water flow rate is always controlled within the range that the subsequent dewatering equipment can withstand (to avoid the instantaneous flow rate exceeding tens of thousands of cubic meters per hour).

[0031] 2. Coke cutting operation scenario: stable conveying through a large channel After entering the coke cutting stage, the coke flow rate becomes small and stable. The pressure sensor detects that the water pressure remains within a low fluctuation range. Based on this, the PLC determines the operating condition to switch and drives the servo motor or hydraulic motor 31 to rotate and open the arc-shaped gate 2 to form a large flow cross section (e.g., Figure 7 As shown, the coke-water mixture can be smoothly transported through the arc-shaped coke chute channel 1 to meet the stable coke discharge requirements during the coke cutting process.

[0032] III. Reset Phase: Restoring to Initial State After the decoking operation is completed, the system enters the shutdown phase. The PLC first controls the hydraulic cylinder to fully close its flat gate 4, and then drives the servo motor or hydraulic motor 31 to close the arc-shaped gate 2, restoring both to their initial closed state. The seal 6 continuously maintains the airtightness of the arc-shaped coke chute channel 1 to prevent leakage of residual coke water in the chute, preparing the equipment for the next decoking operation.

[0033] 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, sealed, current-limiting gate for decoking, characterized in that, Includes an arc-shaped coke chute channel, an arc-shaped gate, an arc-shaped gate drive mechanism, a flat gate, a flat gate drive mechanism, and seals; The arc-shaped gate is rotatably installed at the corresponding channel entrance in the arc-shaped coke chute channel via a rotating shaft. A flow-limiting port is opened at the bottom of the arc-shaped gate, and the rotating shaft is connected to the arc-shaped gate drive mechanism. The flat gate is installed on the arc-shaped gate through a guide sliding mechanism and can cooperate with the flow limiting port to limit the flow. The top of the flat gate is connected to the flat gate drive mechanism. The ends of the arc-shaped gate and the inner wall of the flow restriction port are both equipped with sealing elements.

2. The continuous sealed decoking current-limiting gate according to claim 1, characterized in that, The arc-shaped coke chute channel includes a frame, a coke chute, and a sealing cover. The coke chute is fixedly installed on the top of the frame and is fixedly connected to the sealing cover through a flange.

3. A continuous, sealed, current-limiting gate for decoking according to claim 2, characterized in that, The coke chute has a carbon steel shell and its inner wall is coated with a wear-resistant ceramic coating.

4. A continuous, sealed, flow-limiting gate for decoking according to claim 1, characterized in that, The arc-shaped gate is a carbon steel structural component, which is fixedly connected to the rotating shaft by a hinge. The rotating shaft passes through the arc-shaped coke chute channel and is mounted on the frame through bearings and bearing seats.

5. A continuous, sealed, current-limiting gate for decoking according to claim 1, characterized in that, The arc-shaped gate drive mechanism includes a servo motor or hydraulic motor, a drive gear, a transmission gear, and a drive swing arm. The servo motor or hydraulic motor is fixedly mounted on the frame, and its output shaft is fixedly connected to the drive gear. The drive gear meshes with the transmission gear, the transmission gear is fixedly connected to the drive swing arm, and the drive swing arm is fixedly connected to the rotating shaft.

6. A continuous, sealed, current-limiting gate for decoking according to claim 1, characterized in that, Rollers are fixed on both sides of the flat gate.

7. A continuous, sealed, current-limiting gate for decoking according to claim 1, characterized in that, The guide sliding mechanism includes a gate frame fixed on an arc-shaped gate, a cylinder bracket fixed at the top of the gate frame, and a sliding groove for cooperating with rollers at the bottom.

8. A continuous, sealed, current-limiting gate for decoking according to claim 1, characterized in that, The flat gate drive mechanism includes a hydraulic cylinder, with both ends hinged to the cylinder bracket and the flat gate, respectively.

9. A continuous, sealed, current-limiting gate for decoking according to claim 1, characterized in that, The sealing element uses a P-type sealing strip.

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