Online throttling orifice plate deslagging and cleaning device based on bypass switching

Abstract

The invention discloses a throttling orifice plate online deslagging and cleaning device based on bypass switching, and relates to the technical field of throttling orifice plate online cleaning, the throttling orifice plate online deslagging and cleaning device specifically comprises a medium pipeline and a bypass pipeline, the two sides of the medium pipeline communicate with the bypass pipeline, and a throttling plate assembly is installed on the medium pipeline; according to the invention, intelligent differential pressure monitoring and automatic control are carried out on the circulation of the throttling orifice pipeline, the differential pressure monitoring unit is used for detecting the pressure change of the fluid on the upstream side of the throttling orifice in real time, and the decision displacement unit in the controller is used for automatically judging the blockage degree and driving the hydraulic mechanism to work to complete bypass switching; by means of the design, full-process automation from detection to cleaning is achieved, the requirement for manual intervention is lowered, the cleaning efficiency and accuracy are improved, meanwhile, manual operation errors are reduced, and production safety, energy conservation and consumption reduction are further guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of on-line cleaning of throttle orifice plates, and specifically to an on-line slag removal and cleaning device for throttle orifice plates based on bypass switching. Background Technique

[0002] In the process of chemical production, a throttle orifice plate is a commonly used flow measurement and control device. The throttle orifice plate works based on Bernoulli's equation and the fluid continuity equation. When the fluid flows through the throttle orifice plate, due to the throttling effect of the orifice plate, the flow bundle will contract at the orifice plate, and the flow velocity will increase. According to Bernoulli's equation, the increase in flow velocity will cause the fluid pressure to decrease. Thus, a pressure difference will be generated before and after the throttle orifice plate. This pressure difference has a certain functional relationship with the flow rate of the fluid. By measuring the pressure difference before and after the throttle orifice plate, and then combining the physical properties of the fluid (such as density, viscosity, etc.) and the geometric parameters of the throttle orifice plate (aperture, orifice plate thickness, etc.), the flow rate of the fluid can be calculated according to the relevant flow rate calculation formula;

[0003] However, since chemical fluids often contain various impurities and particles, these impurities are prone to accumulate at the throttle orifice plate, resulting in orifice plate blockage, affecting the accuracy of flow measurement and the normal operation of the device. As mentioned in the patent text with the publication number The on-line cleaning of the flow orifice plate is achieved through components such as a clogging removal rod, an intermediate joint, and a connecting fixed cylinder. The clogging removal rod is composed of a steel needle, a screw rod, and a handle, which can penetrate the blockage and rotate for cleaning, avoiding equipment disassembly, significantly reducing maintenance costs. However, the overall operation requires manual control, with low cleaning efficiency and accuracy, and the cleaned impurities are mixed in the fluid, affecting the subsequent fluid flow in the pipeline. Summary of the Invention

[0004] The purpose of the present invention is to provide an on-line slag removal and cleaning device for throttle orifice plates based on bypass switching to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An on-line slag removal and cleaning device for throttle orifice plates based on bypass switching, including a medium pipeline and a bypass pipeline. Both sides of the medium pipeline are connected and communicated with the bypass pipeline. A throttle plate assembly is installed on the medium pipeline. A main road front valve is installed on the medium pipeline and on one side of the throttle plate assembly, and a main road rear valve is installed on the medium pipeline and on the other side of the throttle plate assembly;

[0006] Blow valves are symmetrically installed on the medium pipeline and opposite to the throttle plate assembly, the main road front valve, and the main road rear valve. A slag discharge valve is installed on the medium pipeline between the blow valve and the throttle plate assembly, and a bypass valve is installed on the bypass pipeline.

[0007] Further, the valve stems of the main road front valve, the main road rear valve and the bypass valve penetrate through the valve body and are sleeved with gear sleeves, and a chain is sleeved and installed between the gear sleeves on the valve stems at the three places.

[0008] Further, a monitoring console is installed on the bottom bracket of the medium pipeline, and a hydraulic driving mechanism is fixedly connected to the side of the monitoring console.

[0009] Further, the hydraulic driving mechanism includes a sealing cylinder and a piston sleeve. A sealing cylinder is fixedly connected to one side of the monitoring console. A piston sleeve is slidably connected in the sealing cylinder. Connecting columns are installed on both sides of the piston sleeve. The two connecting columns respectively penetrate through both sides of the sealing cylinder and are slidably connected to the sealing cylinder. A liquid inlet is opened at the top of the sealing cylinder.

[0010] Further, on the medium pipeline and opposite to the slag discharge valve and the orifice plate assembly, it is connected to the liquid inlet on the sealing cylinder through a pipeline. The two connecting columns are respectively fixed to both ends of the chain.

[0011] Further, a positioning support plate is slidably connected in the monitoring console, and a column on the positioning support plate penetrates through the sealing cylinder and abuts against the piston sleeve.

[0012] Further, hydraulic cylinders are symmetrically fixed to the inner wall of the monitoring console by bolts. One side of the hydraulic cylinder is connected to the positioning support plate, and a controller is installed in the monitoring console.

[0013] Further, the controller includes a differential pressure monitoring unit and a decision displacement unit;

[0014] The differential pressure detection unit is used to obtain the fluid pressure value on the upstream side of the orifice plate assembly, and send the fluid pressure value on the upstream side of the orifice plate assembly to the decision displacement unit for calculation and comparison. The decision displacement unit sets a monitoring period, calculates the difference value of the fluid pressure value on the upstream side of the orifice plate assembly sent by the differential pressure monitoring unit within the monitoring period, generates the upstream side fluid differential pressure value and compares it with the stored upstream side fluid differential pressure threshold value, and when the upstream side fluid differential pressure value is greater than the upstream side fluid differential pressure threshold value, actively controls the hydraulic cylinder to move.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. In the present invention, online cleaning of the orifice plate is realized, ensuring continuous production. Through the coordinated switching of the bypass pipeline and the valve, the orifice plate assembly can be isolated for cleaning and slag discharge without interrupting the medium flow, avoiding the problem that traditional cleaning requires shutdown operation, effectively reducing the economic loss and safety risk caused by startup and shutdown, and significantly improving production efficiency and the operation stability of the device;

[0017] 2. In the present invention, intelligent differential pressure monitoring and automatic control of the pipeline with an orifice plate are realized. The differential pressure monitoring unit is used to detect the change in the fluid pressure on the upstream side of the orifice plate in real time. The decision-making displacement unit in the controller automatically judges the degree of blockage and drives the hydraulic mechanism to work. As the piston sleeve moves, the chain rotates, and the linkage valve completes the bypass switching, automatically opening the slag discharge valve and the purge valve, and finally completing the subsequent purge and slag discharge operations. This design realizes the full-process automation from detection to cleaning, reduces the need for manual intervention, improves the cleaning efficiency and accuracy, and at the same time reduces human operation errors, further ensuring production safety and energy conservation and consumption reduction. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the online slag removal and cleaning device for the orifice plate based on bypass switching of the present invention;

[0019] Figure 2 It is a schematic installation structure diagram of the hydraulic drive mechanism on the medium pipeline of the present invention;

[0020] Figure 3 It is a schematic bottom view of the online slag removal and cleaning device for the orifice plate based on bypass switching of the present invention;

[0021] Figure 4 It is a schematic diagram of the normal fluid flow on the medium pipeline of the present invention;

[0022] Figure 5 It is a schematic structural diagram of the medium pipeline starting to clean the orifice plate assembly of the present invention;

[0023] Figure 6 It is a schematic overall structure diagram of the hydraulic drive assembly of the present invention;

[0024] Figure 7 It is a working flow chart of the online slag removal and cleaning device for the orifice plate based on bypass switching of the present invention.

[0025] In the figure: 1, medium pipeline; 2, orifice plate assembly; 3, front main valve; 4, rear main valve; 5, bypass pipeline; 6, bypass valve; 7, slag discharge valve; 8, purge valve; 9, monitoring console; 10, hydraulic drive mechanism; 101, sealing cylinder; 102, piston sleeve; 103, liquid inlet; 104, connecting column; 11, chain; 12, gear sleeve; 13, hydraulic cylinder; 14, positioning support plate; 15, controller. Detailed Embodiment

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1-7 , the present invention provides a technical solution:

[0028] Embodiment 1: As Figure 1 shown, a throttling orifice plate on-line slag removal and cleaning device for bypass switching opens a bypass pipeline on the main flow pipeline and sets relevant valves for centralized control. Without affecting the continuous operation of the device, the throttling orifice plate assembly 2 can be removed from the system to realize the on-line cleaning and slag removal of the throttling orifice plate assembly 2;

[0029] For the installation of valves on the medium pipeline 1, a throttling orifice plate assembly 2 is installed in the middle of the medium pipeline 1, and a main road front valve 3 and a main road rear valve 4 are symmetrically installed on the medium pipeline 1 on both sides of the throttling orifice plate assembly 2. The bypass pipeline 5 needs to be connected to both sides of the medium pipeline 1. Therefore, the connection side is far away from the main road front valve 3 and the main road rear valve 4 to avoid being affected by the closing of the main road front valve 3 and the main road rear valve 4;

[0030] When the medium pipeline 1 is working normally, the main road front valve 3 and the main road rear valve 4 are opened. As Figure 4 shown, the medium directly passes through the throttling orifice plate assembly 2. For the subsequent cleaning of the throttling orifice plate assembly 2, as Figure 5 shown, at this time, the main road front valve 3 and the main road rear valve 4 need to be closed, and the medium continues to flow through the bypass pipeline 5. At this time, the main road front valve 3 and the main road rear valve 4 create a cleaning space for the throttling orifice plate assembly 2. Since there is still intercepted medium in the throttling orifice that has not been discharged, the slag discharge valve 7 on the medium pipeline 1 is opened, and the residual materials in the pipe are collected into a specified container for centralized disposal. Special cleaning agents or nitrogen are injected respectively from the purge valves 8 installed on both sides of the throttling orifice plate assembly 2 to clean the throttling orifice plate assembly 2 forward and backward until the residual waste liquid and waste residue at the throttling orifice plate assembly 2 are cleaned along the slag discharge pipe into the specified container;

[0031] After the cleaning is completed, the purge valves 8 and the slag discharge valve 7 are closed, the main road front valve 3 and the main road rear valve 4 of the throttling orifice plate assembly 2 are slowly opened, and the bypass valve 6 is slowly closed, so that the throttling orifice plate assembly 2 resumes operation. This solution realizes the on-line slag removal and liquid removal of the throttling orifice plate assembly 2, realizes the continuous operation of the device, greatly avoids the economic property losses and safety risks brought by starting and stopping, meets the requirements of safe production, realizes energy conservation and consumption reduction, improves economic benefits, boosts safe production, and has good popularization value.

[0032] Embodiment 2: For the opening and closing control of the entire main road front valve 3, main road rear valve 4, and bypass valve 6, adjustment is only performed when a cleaning signal of the orifice plate assembly 2 is obtained. For the entire orifice plate assembly 2, it is the core component of a differential pressure flowmeter and is used in conjunction with a differential pressure transmitter. When the fluid flows through the orifice plate, a pressure difference is generated before and after. The flow rate is calculated by measuring the pressure difference.

[0033] When the aperture on the orifice plate gradually becomes smaller due to the adhesion of impurities and oil stains, the aperture shrinks, the flow cross-sectional area decreases, and the flow velocity of the fluid in front of the orifice plate increases sharply. According to Bernoulli's equation, the increase in flow velocity will cause the static pressure to further decrease. Therefore, the upstream side pressure drops significantly. At the narrowest part of the orifice plate, the flow velocity reaches the maximum value and the static pressure drops to the lowest point. At this time, it may be close to or even lower than the saturation vapor pressure of the liquid, triggering cavitation. After the fluid passes through the orifice plate, the flow velocity decreases, and part of the kinetic energy is converted into static pressure energy. However, due to fluid viscosity and turbulent dissipation, the pressure can only be partially restored. The smaller the aperture, the more significant the downstream eddy current area and the greater the energy loss, resulting in a lower degree of pressure recovery on the downstream side. Therefore, the pressure difference across the orifice plate assembly 2 increases as the aperture shrinks.

[0034] Therefore, a monitoring console 9 is installed on the bottom bracket of the medium pipeline 1. The side of the monitoring console 9 is connected to a hydraulic drive mechanism 10 to monitor the fluid pressure value on the upstream side of the orifice plate assembly 2. As Figure 6 shown, the detector installed in the monitoring console 9 includes a differential pressure monitoring unit and a decision displacement unit;

[0035] The differential pressure detection unit is used to obtain the fluid pressure value on the upstream side of the orifice plate assembly 2 and send the fluid pressure value on the upstream side of the orifice plate assembly 2 to the decision displacement unit for calculation and comparison;

[0036] The decision displacement unit sets a monitoring period, calculates the difference in the fluid pressure value on the upstream side of the orifice plate assembly 2 sent by the differential pressure monitoring unit within the monitoring period, subtracts the previous and subsequent data, generates the fluid pressure difference value on the upstream side, and compares it with the stored fluid pressure difference threshold on the upstream side. When the fluid pressure difference value on the upstream side is greater than the fluid pressure difference threshold on the upstream side, it actively controls the hydraulic cylinder 13 to move. As Figure 6 shown, the entire hydraulic drive mechanism 10 takes the sealed cylinder 101 as the main body. A piston sleeve 102 is installed inside the sealed cylinder 101, and connecting columns 104 are connected to both sides of the piston sleeve 102. The two connecting columns 104 penetrate through the sealed cylinder 101 and the monitoring console 9 and extend to the outside. An inlet port 103 is opened at the top of the sealed cylinder 101, and the inlet port 103 is connected to the upstream side of the orifice plate assembly 2 through a pipeline;

[0037] With the normal flow operation of the medium pipeline 1, the aperture of the orifice plate assembly 2 continuously decreases, and the fluid pressure value on its upstream side continuously decreases, resulting in a decrease in the fluid pressure value in the sealing cylinder 101 connected to it. The fluid pressure in the sealing cylinder 101 acts on the piston sleeve 102 and is transmitted to the controller 15 through the positioning support plate 14 abutted against the side of the piston sleeve 102. At this time, the decision-making displacement unit in the controller 15 calculates the difference between the acquired front and rear fluid pressure values within a set period to obtain the fluid pressure difference value, and compares it with the stored fluid pressure difference threshold value;

[0038] When the fluid pressure difference value is greater than the fluid pressure difference threshold value, it indicates that the orifice plate assembly 2 is severely blocked, and pipeline switching and orifice cleaning treatments are required. At this time, the active control hydraulic cylinder 13 contracts, pulling the piston sleeve 102 to move to the right. The connecting columns 104 on both sides of the piston sleeve 102 are connected to the outer chain 11, thereby driving the chain 11 to move. Combining Figure 2 It can be understood that tooth sleeves 12 are sleeved and installed on the valve stems of the entire main road front valve 3, main road rear valve 4, and bypass valve 6. The tooth sleeves 12 are wound and connected through the chain 11, and the movement of the chain 11 drives the rotation of the valve stems at the three places, ultimately realizing the rotation of the valve plates in the main road front valve 3, main road rear valve 4, and bypass valve 6. Since the initial valve plate angles of the main road front valve 3, main road rear valve 4, and bypass valve 6 are different, that is, the main road front valve 3 and the main road rear valve 4 are opened while the bypass valve 6 is closed, the control of the sealing valves on the entire pipeline is realized;

[0039] At this time, combined with the cleaning of the orifice plate assembly 2 mentioned in Embodiment 1, as Figure 7 shown, the remaining slag discharge valve 7 and purge valve 8 are automatically opened to perform the independent cleaning work of the orifice plate assembly 2 in the medium pipeline 1. Compared with manual adjustment and control one by one, the degree of automation is low, which affects the overall cleaning efficiency.

[0040] The working principle of the present invention: Under normal working conditions, the main road front valve 3 and the main road rear valve 4 are opened, the bypass valve 6 is closed, the medium flows through the orifice plate assembly 2 to realize flow measurement, and the differential pressure monitoring unit real-time collects the fluid pressure value on the upstream side of the orifice plate. The decision-making displacement unit of the controller 15 calculates the differential pressure change. When the differential pressure exceeds the preset threshold value, it is determined that the orifice plate needs to be cleaned;

[0041] The hydraulic drive mechanism 10 is linked with the main road front valve 3, the main road rear valve 4, and the bypass valve 6 through the chain 11. When the cleaning signal is triggered, the main road front valve and the rear valve are closed, the bypass valve is opened, and the medium is diverted to flow through the bypass pipeline 5 to isolate the orifice plate assembly 2;

[0042] The slag discharge valve 7 is opened to discharge the residual materials. The purging valve 8 is used to inject cleaning agent or nitrogen to flush the orifice plate in both forward and reverse directions. The waste liquid is discharged through the slag discharge valve. After the cleaning is completed, the slag discharge valve 7 and the purging valve 8 are closed. The hydraulic drive mechanism 10 resets the piston sleeve 102 through pressure feedback, and the chain linkage valve returns to the initial state. The front valve 3 and the rear valve 4 of the main path are opened, and the bypass valve 6 is closed. The medium resumes flowing through the orifice plate assembly 2, and the system re-enters the monitoring cycle.

[0043] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution. As long as it does not deviate from the structure of the invention or exceed the scope defined by this claim book, it shall fall within the protection scope of the present invention.

[0044] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0045] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not elaborate on all details and do not limit the present invention to only the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the art of this technology can well understand and utilize the present invention. The present invention is only limited by the claim book and its full scope and equivalents.

Claims

1. A throttling orifice plate online slag removal and cleaning device based on bypass switching, comprising a medium pipeline (1) and a bypass pipeline (5), wherein both sides of the medium pipeline (1) are connected to the bypass pipeline (5), and characterized in that: A throttle plate assembly is installed on the medium pipeline (1), a main line front valve (3) is installed on the medium pipeline (1) and located on one side of the throttle plate assembly, and a main line rear valve (4) is installed on the medium pipeline (1) and located on the other side of the throttle plate assembly; A purge valve (8) is symmetrically installed on the medium pipeline (1) and located on opposite surfaces of the throttle plate assembly and the main line front valve (3) and the main line rear valve (4); a slag discharge valve (7) is installed on the medium pipeline (1) and located between the purge valve (8) and the throttle plate assembly; and a bypass valve (6) is installed on the bypass pipeline (5).

2. The throttle orifice plate online slag removal and cleaning device based on bypass switching according to claim 1 is characterized in that: The valve stems of the main line front valve (3), the main line rear valve (4) and the bypass valve (6) penetrate the valve body and are sleeved with gear sleeves (12), and chains (11) are sleeved between the gear sleeves (12) on the three valve stems.

3. The on-line slag removal and cleaning device of the throttle orifice plate based on bypass switching according to claim 2 is characterized in that: A control platform (9) is installed on the bottom bracket of the medium pipeline (1), and a hydraulic drive mechanism (10) is fixedly connected to one side of the control platform (9).

4. The throttle orifice plate online slag removal and cleaning device based on bypass switching according to claim 3 is characterized in that: The hydraulic drive mechanism (10) comprises a sealing cylinder (101) and a piston sleeve (102); the sealing cylinder (101) is fixedly connected to one side of the inspection and control platform (9); the piston sleeve (102) is slidably connected inside the sealing cylinder (101); connecting columns (104) are installed on both sides of the piston sleeve (102); the connecting columns (104) on both sides respectively penetrate both sides of the sealing cylinder (101) and are slidably connected to the sealing cylinder (101); and a liquid inlet (103) is opened on the top of the sealing cylinder (101).

5. The on-line slag removal and cleaning device of the throttling orifice plate based on bypass switching according to claim 4 is characterized in that: The medium pipeline (1) is located on the opposite side of the slag discharge valve (7) and the throttling orifice assembly (2) and is connected to the liquid inlet (103) on the sealing cylinder (101) through a pipeline, and the connecting columns (104) on both sides are respectively fixed to the two ends of the chain (11).

6. The on-line slag removal and cleaning device of the throttling orifice plate based on bypass switching according to claim 5 is characterized in that: A positioning support plate (14) is slidably connected inside the inspection and control platform (9), and a column is arranged on the positioning support plate (14) to penetrate the sealing cylinder (101) and abut against the piston sleeve (102).

7. The on-line slag removal and cleaning device of the throttle orifice plate based on bypass switching according to claim 6 is characterized in that: A hydraulic cylinder (13) is symmetrically fixed to the inner wall of the inspection and control platform (9) by means of bolts, one side of the hydraulic cylinder (13) is connected to a positioning support plate (14), and a controller (15) is installed in the inspection and control platform (9).

8. The on-line slag removal and cleaning device of the throttle orifice plate based on bypass switching according to claim 7 is characterized in that: The controller (15) comprises a pressure difference monitoring unit and a decision displacement unit; The pressure difference detection unit is used to obtain the fluid pressure value on the upstream side of the throttling orifice assembly (2), and send the fluid pressure value on the upstream side of the throttling orifice assembly (2) to the decision displacement unit for calculation and comparison. The decision displacement unit sets a monitoring period, performs difference calculation on the fluid pressure value on the upstream side of the throttling orifice assembly (2) sent by the pressure difference monitoring unit within the monitoring period, generates an upstream side fluid pressure difference value and compares it with a stored upstream side fluid pressure difference threshold value, and actively controls the hydraulic cylinder (13) to move when the upstream side fluid pressure difference value is greater than the upstream side fluid pressure difference threshold value.

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