A method and system for pressure adaptive opening and closing control of a stopcock valve

Abstract

This invention discloses a pressure-adaptive opening and closing control method and system for a plug valve, comprising: determining the critical opening value data of the plug valve under different inlet pressure values ​​based on CFD simulation data of the plug valve; determining the dangerous opening threshold data of the plug valve based on the critical opening value data, and constructing a mathematical fitting model based on the two; determining the current inlet pressure of the plug valve, and determining the current dangerous opening threshold of the plug valve based on it and the mathematical fitting model; determining the current opening value of the plug valve, and determining the opening difference value between it and the current dangerous opening threshold; setting the opening and closing adjustment coefficient of the plug valve based on the opening difference value, and adaptively adjusting and controlling the opening and closing working conditions of the plug valve based on it. This invention dynamically quantifies the dangerous threshold by constructing a mathematical fitting model, and intelligently switches the opening and closing control mode of the plug valve by analyzing the opening difference, significantly improving the reliability, sealing life and safety of the valve under extreme pressure.

Description

Technical Field

[0001] This invention relates to the field of plug valve safety control technology, and in particular to a plug valve pressure adaptive opening and closing control method and system. Background Technology

[0002] In industrial fields such as oil and gas extraction, supercritical fluid extraction, ultra-high pressure water jet cutting, and extreme chemical reactions, ultra-high pressure plug valves serve as critical control components operating at high pressures. Under these extreme conditions, the compressibility of the medium is significantly enhanced, and the energy density rises sharply, resulting in extremely complex flow characteristics during valve opening and closing. Particularly in the initial stage of plug opening or closing, the fluid flowing through the throttling gap generates high-speed jets, severe pressure fluctuations, and high-intensity wall shear stress. These factors can easily induce erosion and wear of the sealing surface, valve body vibration, and even water hammer effects, seriously threatening the valve's service life and system safety.

[0003] Traditional plug valve control methods often employ constant-speed opening and closing or logic control based on simple timing. Their critical opening thresholds are usually fixed values ​​set based on experience and cannot be dynamically adjusted according to real-time pressure changes. This results in the valve suffering prolonged erosion due to slow speed in traversing the critical zone when pressure fluctuates or operating conditions change, or impact damage to the sealing surface due to lack of end buffer. Furthermore, existing control strategies often struggle to quantify the evolution of the critical opening region under different pressures and lack the scientific basis to transform complex fluid dynamics characteristics into real-time control decisions, thus limiting the development of ultra-high pressure valves in the direction of intelligent and adaptive control. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method and system for adaptive opening and closing control of a plug valve, comprising:

[0005] Obtain CFD simulation data of the plug valve and analyze the CFD simulation data to determine the critical opening value of the plug valve under different inlet pressure values. The critical opening value data are analyzed to determine the dangerous opening threshold data of the plug valve, and a mathematical fitting model is constructed based on the valve inlet pressure data and the dangerous opening threshold data. Determine the current inlet pressure of the plug valve, and determine the current dangerous opening threshold of the plug valve based on the current inlet pressure and the mathematical fitting model. Determine the current opening value of the plug valve, and analyze the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value; The opening and closing adjustment coefficient of the plug valve is set based on the opening degree difference value, and the opening and closing working conditions of the plug valve are adaptively adjusted and controlled based on the opening and closing adjustment coefficient.

[0006] Furthermore, the acquisition of CFD simulation data of the plug valve and the analysis of the CFD simulation data to determine the critical opening value of the plug valve under different inlet pressure values ​​include: A three-dimensional model of the plug valve was established for CFD simulation, and CFD simulation data of the plug valve was obtained. The CFD simulation data included the internal flow field parameters of the plug valve at different valve openings calculated for different inlet pressures. Extract the physical quantities characterizing the plug valve's dangerous state from the internal flow field parameters. These physical quantities include the maximum fluid velocity at the throttling point, wall shear force, turbulent kinetic energy, and pressure fluctuation amplitude. Determine the pre-set sub-safety thresholds for each physical quantity, and calculate the comprehensive safety value of the plug valve based on the physical quantity and the corresponding sub-safety thresholds. Determine the pre-set comprehensive safety threshold, and determine the valve opening degree corresponding to the comprehensive safety value of the plug valve being greater than or equal to the comprehensive safety threshold; These determined valve openings are then used as the critical opening values ​​for the plug valve under different inlet pressure values.

[0007] Furthermore, the formula for calculating the overall safety value of the plug valve is as follows: , Where S is the overall safety value of the plug valve, wi is the preset weight of the i-th physical quantity, Xi is the i-th physical quantity, Yi is the sub-safety threshold corresponding to the i-th physical quantity, and n is the number of types of physical quantities.

[0008] Furthermore, the analysis of the critical opening value data to determine the dangerous opening threshold data of the plug valve includes: Determine the pre-set safety factor, and multiply the safety factor by the critical opening value data to obtain the dangerous opening threshold data of the plug valve.

[0009] Furthermore, the mathematical fitting model constructed based on the valve inlet pressure data and the dangerous opening threshold data includes: Using the inlet pressure data as the independent variable and the critical opening threshold as the dependent variable, a mathematical fitting model of the inlet pressure value versus the critical opening threshold of the plug valve is constructed. The mathematical formula of the mathematical fitting model is as follows: θ=θ0+K (P P0) Where θ is the dangerous opening threshold of the plug valve, P0 is the reference inlet pressure value, θ0 is the dangerous opening threshold under the reference inlet pressure value, K is the fitting gain coefficient, and P is the inlet pressure value of the plug valve.

[0010] Furthermore, determining the current inlet pressure of the plug valve and determining the current dangerous opening threshold of the plug valve based on the current inlet pressure and a mathematical fitting model includes: Determine the current inlet pressure of the plug valve and input it into the mathematical fitting model for output, so as to obtain the current dangerous opening threshold of the plug valve.

[0011] Furthermore, determining the current opening value of the plug valve and analyzing the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value includes: Determine the current opening value of the plug valve and calculate the difference between the current opening value and the current dangerous opening threshold to obtain the opening difference value. When the opening difference value is less than or equal to zero, the plug valve is determined to be in the dangerous opening range. When the opening difference value is greater than zero, the plug valve is determined to be in the safe opening range.

[0012] Furthermore, the setting of the opening and closing adjustment coefficient of the plug valve based on the opening degree difference value includes: The end opening buffer zone is determined in advance to achieve a buffer seal at the end of the plug valve; When the opening difference is less than or equal to zero, the opening and closing adjustment coefficient of the plug valve is set to the first opening and closing adjustment coefficient. When the opening difference value is greater than zero and the current opening value of the plug valve is not in the end opening buffer zone, the opening and closing adjustment coefficient of the plug valve is set to the second opening and closing adjustment coefficient. When the current opening value of the plug valve is within the end opening buffer zone, regardless of the opening difference value, the opening and closing adjustment coefficient of the plug valve is set to the third opening and closing adjustment coefficient.

[0013] Furthermore, the adaptive adjustment and control of the opening and closing operating conditions of the plug valve based on the opening and closing adjustment coefficient includes: Determine the reference operating parameters of the actuator on the plug valve, and convert the opening and closing adjustment coefficients into control commands for the actuator; The reference operating parameters of the actuator are adjusted based on the control commands to obtain the adaptive opening and closing control strategy of the plug valve, and the opening and closing operating conditions of the plug valve are adaptively adjusted and controlled through the adaptive opening and closing control strategy.

[0014] The present invention also provides a pressure adaptive opening and closing control system for a plug valve, comprising: The acquisition module is used to acquire CFD simulation data of the plug valve and analyze the CFD simulation data to determine the critical opening value of the plug valve under different inlet pressure values. The fitting module is used to analyze the critical opening value data, determine the dangerous opening threshold data of the plug valve, and build a mathematical fitting model based on the valve inlet pressure value data and the dangerous opening threshold data. The determination module is used to determine the current inlet pressure of the plug valve and, based on the current inlet pressure of the plug valve and a mathematical fitting model, determine the current dangerous opening threshold of the plug valve. The calculation module is used to determine the current opening value of the plug valve and analyze the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value. The adjustment module is used to set the opening and closing adjustment coefficient of the plug valve based on the opening degree difference value, and to adaptively adjust and control the opening and closing working conditions of the plug valve based on the opening and closing adjustment coefficient.

[0015] Compared with the prior art, the beneficial effects of the adaptive opening and closing control method and system for a plug valve according to embodiments of the present invention are as follows: This invention determines the critical opening degree corresponding to each pressure point through offline CFD simulation analysis, fundamentally solving the contradiction between valve opening and closing and safety under ultra-high pressure conditions. Based on this, a mathematical fitting model for dynamic dangerous opening degree threshold is constructed, which can dynamically calculate the dangerous threshold according to the current valve inlet pressure, realize the dynamic adjustment of the dangerous threshold based on real-time pressure changes, and quantify the evolution law of dangerous opening degree region under different pressures. This invention compares a danger threshold with the real-time opening degree and intelligently switches the control mode based on the difference in opening degree. This achieves a leap from empirical fixed-mode control to adaptive intelligent control based on real-time pressure-position feedback, significantly improving the operational reliability, sealing life, and safety of valves under extreme pressure. At the same time, it reduces unnecessary energy loss and actuator wear by optimizing the opening and closing control. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the flow structure of the adaptive opening and closing control method for the plug valve pressure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the composition of the plug valve pressure adaptive opening and closing control system in an embodiment of the present invention. Detailed Implementation

[0017] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0018] like Figure 1As shown in the embodiments of this application, a method for adaptive opening and closing control of a plug valve is provided, comprising: S100: acquiring CFD simulation data of the plug valve, analyzing the CFD simulation data, and determining the critical opening value data of the plug valve under different inlet pressure values; S200: analyzing the critical opening value data, determining the dangerous opening threshold data of the plug valve, and constructing a mathematical fitting model based on the inlet pressure value data and the dangerous opening threshold data; S300: determining the current inlet pressure of the plug valve, and determining the current dangerous opening threshold of the plug valve based on the current inlet pressure of the plug valve and the mathematical fitting model; S400: determining the current opening value of the plug valve, and analyzing the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value; S500: setting the opening and closing adjustment coefficient of the plug valve based on the opening and closing adjustment coefficient, and adaptively adjusting and controlling the opening and closing working conditions of the plug valve based on the opening and closing adjustment coefficient.

[0019] Furthermore, this invention determines the critical opening degree corresponding to each pressure point through offline CFD simulation analysis, fundamentally resolving the contradiction between valve opening / closing and safety under ultra-high pressure conditions. Based on this, a mathematical fitting model for the dynamic dangerous opening degree threshold is constructed, which can dynamically calculate the dangerous threshold according to the current inlet pressure, realizing the dynamic adjustment of the dangerous threshold based on real-time pressure changes, and quantifying the evolution law of the dangerous opening degree region under different pressures. This invention achieves a leap from empirical fixed mode control to adaptive intelligent control based on real-time pressure-position feedback by comparing the dangerous threshold with the real-time opening degree and intelligently switching the control mode based on the opening degree difference value. This significantly improves the operational reliability, sealing life and safety of the valve under extreme pressure, while reducing unnecessary energy loss and actuator wear by optimizing the opening and closing control.

[0020] In the embodiments of this application, a pressure adaptive opening and closing control method for a plug valve is provided. The method involves acquiring CFD simulation data of the plug valve and analyzing the CFD simulation data to determine the critical opening value data corresponding to the plug valve under different inlet pressure values. This includes: establishing a three-dimensional model of the plug valve for CFD simulation and acquiring the CFD simulation data, which includes internal flow field parameters of the plug valve at different valve openings calculated for different inlet pressures; extracting physical quantities characterizing the plug valve's dangerous state from the internal flow field parameters, including maximum fluid velocity at the throttling point, wall shear force, turbulent kinetic energy, and pressure fluctuation amplitude; determining pre-set sub-safety thresholds for each physical quantity and calculating the comprehensive safety value of the plug valve based on the physical quantities and their corresponding sub-safety thresholds; determining the pre-set comprehensive safety threshold and the corresponding valve openings where the comprehensive safety value of the plug valve is greater than or equal to the comprehensive safety threshold; and defining these determined corresponding valve openings as the critical opening value data corresponding to the plug valve under different inlet pressure values.

[0021] Specifically, a three-dimensional model of the plug valve is established for CFD simulation to obtain internal flow field parameters covering different inlet pressures and corresponding valve openings. Four key physical quantities characterizing dangerous conditions—maximum fluid velocity at the throttling point, wall shear force, turbulent kinetic energy, and pressure fluctuation amplitude—are extracted from these parameters. Each physical quantity is compared and calculated against its preset sub-safety thresholds, and a comprehensive safety value characterizing the overall danger level of the valve is obtained through weighted calculation. The valve opening where the comprehensive safety value reaches or exceeds the preset comprehensive safety threshold is then determined as the critical opening value under that pressure condition. This step upgrades the judgment based on a single physical index to a comprehensive evaluation system integrating multiple parameters. By comprehensively considering the coupling effects of multiple failure mechanisms such as erosion, shear, turbulent vibration, and pressure fluctuations, the scientific accuracy of critical opening identification is significantly improved, avoiding misjudgments or omissions that may occur with a single index. This provides a more reliable data foundation for subsequent pressure adaptive control, effectively ensuring the safe operating boundary of the ultra-high pressure plug valve under complex operating conditions.

[0022] In the embodiments of this application, a method for adaptive opening and closing control of a plug valve pressure is provided, wherein the formula for calculating the comprehensive safety value of the plug valve is: , Where S is the overall safety value of the plug valve, wi is the preset weight of the i-th physical quantity, Xi is the i-th physical quantity, Yi is the sub-safety threshold corresponding to the i-th physical quantity, and n is the number of types of physical quantities.

[0023] In the embodiments of this application, a method for adaptive opening and closing control of a plug valve pressure is provided. The step of analyzing the critical opening value data to determine the dangerous opening threshold data of the plug valve includes: determining a pre-set safety factor and multiplying the safety factor with the critical opening value data to obtain the dangerous opening threshold data of the plug valve.

[0024] Specifically, by multiplying a preset safety factor with the critical opening value, the theoretical critical danger boundary is further modified into a dangerous opening threshold for engineering applications. The critical opening value is the theoretical danger starting point derived from CFD simulation. However, in actual operating conditions, there may be uncertainties such as fluctuations in media characteristics, pressure sensor measurement errors, valve manufacturing tolerances, and wear of the sealing surface after long-term operation. Therefore, an additional safety margin is required. By multiplying the safety factor with the critical opening value, the danger judgment point is moved to a safer area. That is, the control system triggers protective actions in advance before the actual flow field parameters reach the theoretical danger value. This step constructs a safety buffer zone from theoretical analysis to engineering practice, effectively compensating for the deviation between the simulation model and the actual operating conditions. It avoids the risk of frequent triggering or failure of control actions due to parameter fluctuations near the critical point. At the same time, the adjustable safety factor enables flexible adaptation to different operating conditions, maximizing the preservation of effective flow capacity while ensuring safe valve operation. This provides a scientific and robust decision-making basis for subsequent adaptive control.

[0025] In embodiments of this application, a method for adaptive opening and closing control of a plug valve is provided. The method involves constructing a mathematical fitting model based on inlet valve pressure data and a dangerous opening threshold data. This includes: performing data fitting with inlet valve pressure data as the independent variable and the dangerous opening threshold as the dependent variable to construct a mathematical fitting model of the plug valve's inlet valve pressure value minus the dangerous opening threshold. The mathematical formula for the mathematical fitting model is: θ=θ0+K (P P0) Where θ is the dangerous opening threshold of the plug valve, P0 is the reference inlet pressure value, θ0 is the dangerous opening threshold under the reference inlet pressure value, K is the fitting gain coefficient, and P is the inlet pressure value of the plug valve.

[0026] Specifically, using different inlet valve pressure values ​​as independent variables and the corresponding calculated dangerous opening threshold values ​​as dependent variables, a continuous mathematical fitting model of inlet valve pressure value-dangerous opening threshold is constructed through data fitting methods. This transforms the discrete data points obtained after CFD simulation and safety factor correction into a smooth, real-time calculable functional relationship. This allows the control system to quickly and accurately interpolate or calculate the dangerous opening threshold under the current operating condition based on the real-time collected inlet valve pressure values ​​during actual operation. In the mathematical formula, θ0 represents the dangerous initial opening determined by simulation analysis at a typical pressure reference point, while the gain coefficient K quantifies the sensitivity of the dangerous opening to pressure changes, i.e., the increment by which the dangerous opening threshold needs to be expanded for each unit increase in pressure. This step enables the transition from discrete calibration to continuous dynamic response for the critical opening threshold, avoiding control oscillations caused by threshold jumps due to pressure fluctuations. It also provides the controller with a concise and efficient real-time calculation basis, ensuring the real-time performance and stability of the pressure-adaptive opening and closing control. Based on the interpretability of the fitted model, residual analysis can be used to evaluate the model's prediction accuracy, providing quantitative feedback for further optimization of the safety factor and CFD simulation boundary conditions, thereby continuously improving the reliability and adaptability of the control strategy.

[0027] In the embodiments of this application, a method for adaptive opening and closing control of a plug valve pressure is provided. The method for determining the current inlet pressure of the plug valve and determining the current dangerous opening threshold of the plug valve based on the current inlet pressure and a mathematical fitting model includes: determining the current inlet pressure of the plug valve and inputting the current inlet pressure of the plug valve into the mathematical fitting model for output to obtain the current dangerous opening threshold of the plug valve.

[0028] Specifically, a high-precision pressure sensor collects the current inlet pressure of the plug valve, and this pressure value is used as an input variable to a pre-constructed mathematical fitting model of inlet pressure-dangerous opening threshold. The model calculates and outputs the corresponding current dangerous opening threshold in real time based on the fitting function. This step enables the dangerous opening threshold to dynamically follow and instantly respond to real-time operating pressure, allowing the control strategy to adaptively adjust the judgment boundary of the dangerous area according to the actual pressure fluctuations. This avoids misjudgments that may occur when the fixed threshold changes with pressure, such as insufficient protection due to an excessively small threshold under high pressure or excessive conservatism due to an excessively large threshold under low pressure. At the same time, the model calculation process is completed in milliseconds, fully meeting the real-time requirements of ultra-high pressure valve control, and providing an accurate and reliable decision-making benchmark for subsequent adaptive adjustment of opening and closing speed.

[0029] In an embodiment of this application, a method for adaptive opening and closing control of a plug valve pressure is provided. The method involves determining the current opening value of the plug valve and analyzing the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value. This includes: determining the current opening value of the plug valve and calculating the difference between the current opening value and the current dangerous opening threshold to obtain the opening difference value. When the opening difference value is less than or equal to zero, the plug valve is determined to be in the dangerous opening range. When the opening difference value is greater than zero, the plug valve is determined to be in the safe opening range.

[0030] Specifically, the current opening value of the plug valve is collected in real time by an angle sensor, and the difference is calculated between this value and the current dangerous opening threshold based on real-time pressure. The system then performs a logical judgment based on the sign of this difference. When the difference is less than or equal to zero, it indicates that the current opening has entered or exceeded the dangerous threshold boundary, and the system determines that the plug valve is in the dangerous opening range. When the difference is greater than zero, it is determined to be in the safe opening range. This step achieves real-time quantitative assessment and precise positioning of the valve's dangerous state. By mapping continuous opening positions to a clear binary state, it provides a clear and reliable trigger criterion for subsequent adaptive adjustment of opening and closing speeds. Simultaneously, the judgment logic based on the sign of the difference is simple and efficient, avoiding complex fuzzy calculations, ensuring the real-time and deterministic nature of the control response, and triggering protective actions immediately the moment the valve enters the dangerous zone, thereby minimizing the time spent in high-risk areas.

[0031] In the embodiments of this application, a method for adaptive opening and closing control of a plug valve is provided. The method for setting the opening and closing adjustment coefficient of the plug valve based on the opening difference value includes: determining a pre-set end opening buffer zone for achieving end-sealing of the plug valve; when the opening difference value is less than or equal to zero, setting the opening and closing adjustment coefficient of the plug valve as a first opening and closing adjustment coefficient; when the opening difference value is greater than zero and the current opening value of the plug valve is not within the end opening buffer zone, setting the opening and closing adjustment coefficient of the plug valve as a second opening and closing adjustment coefficient; when the current opening value of the plug valve is within the end opening buffer zone, regardless of the opening difference value, setting the opening and closing adjustment coefficient of the plug valve as a third opening and closing adjustment coefficient.

[0032] Specifically, a buffer zone for the end opening degree is preset to achieve end-of-end buffer sealing. Within 5° before the fully closed position, a multi-mode decision is made based on the judgment result of the opening degree difference value and the current opening degree position. When the opening degree difference value is less than or equal to zero (i.e., in the dangerous opening degree range), the opening and closing adjustment coefficient is set to the first opening and closing adjustment coefficient, i.e., high-speed crossing mode. When the opening degree difference value is greater than zero and the current opening degree value has not entered the end opening degree buffer zone, it is set to the second opening and closing adjustment coefficient, i.e., normal mode. When the current opening degree value has entered the end opening degree buffer zone, regardless of whether the opening degree difference value is positive or negative, it is forcibly set to the third opening and closing adjustment coefficient, i.e., low-speed damping mode. This step establishes a priority-based hierarchical adaptive adjustment mechanism. By elevating the control priority of the end buffer to the highest level, it ensures that the valve's sealing surface gently adheres at the closing end without being disturbed by the high-speed mode in the danger zone. This balances the need for rapid passage through the danger zone with the need for shock protection at the end. Simultaneously, based on the joint judgment of the opening degree difference value and the position range, the valve can automatically match the optimal opening and closing speed curve under different operating conditions, realizing full-process adaptive optimization control from rapid response to precise sealing.

[0033] In the embodiments of this application, an adaptive opening and closing control method for a plug valve is provided. The adaptive adjustment and control of the opening and closing working conditions of the plug valve based on the opening and closing adjustment coefficient includes: determining the reference working parameters of the actuator on the plug valve and converting the opening and closing adjustment coefficient into control commands for the actuator; adjusting the reference working parameters of the actuator based on the control commands to obtain an adaptive opening and closing control strategy for the plug valve, and adaptively adjusting and controlling the opening and closing working conditions of the plug valve through the adaptive opening and closing control strategy.

[0034] Specifically, the baseline operating parameters of the actuator are determined, and the opening and closing adjustment coefficients (first, second, or third opening and closing adjustment coefficients) determined based on the opening difference value and the end buffer are converted into specific actuator control commands. The control system corrects the output characteristics of the actuator in real time according to these commands, generates an adaptive opening and closing control strategy that matches the current operating conditions, and finally drives the plug valve to complete the opening and closing action according to the strategy. This step achieves a seamless transformation from decision coefficients to physical actions, accurately applying multi-mode adaptive logic to the actuator, ensuring that the actual movement trajectory of the valve during high-speed passage through dangerous areas, stable operation in safe areas, and low-speed buffering at the end is highly consistent with the theoretical control target. This effectively suppresses erosion, vibration, and sealing surface impact under ultra-high pressure environments, significantly improving the safety, stability, and service life of valve operation. At the same time, closed-loop control enables the entire opening and closing process to have intelligent characteristics that respond to changes in operating conditions in real time.

[0035] like Figure 2As shown in the embodiments of this application, a pressure adaptive opening and closing control system for a plug valve is provided, comprising: an acquisition module for acquiring CFD simulation data of the plug valve and analyzing the CFD simulation data to determine the critical opening value data of the plug valve under different inlet pressure values; a fitting module for analyzing the critical opening value data to determine the dangerous opening threshold data of the plug valve and constructing a mathematical fitting model based on the inlet pressure value data and the dangerous opening threshold data; a determination module for determining the current inlet pressure of the plug valve and determining the current dangerous opening threshold of the plug valve based on the current inlet pressure of the plug valve and the mathematical fitting model; a calculation module for determining the current opening value of the plug valve and analyzing the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value; and an adjustment module for setting the opening and closing adjustment coefficient of the plug valve based on the opening difference value and adaptively adjusting and controlling the opening and closing working conditions of the plug valve based on the opening and closing adjustment coefficient.

[0036] In summary, this invention provides a method and system for adaptive pressure opening and closing control of a plug valve, comprising: determining the critical opening value data of the plug valve under different inlet pressure values ​​based on CFD simulation data of the plug valve; determining the dangerous opening threshold data of the plug valve based on the critical opening value data, and constructing a mathematical fitting model based on the two; determining the current inlet pressure of the plug valve, and determining the current dangerous opening threshold of the plug valve based on it and the mathematical fitting model; determining the current opening value of the plug valve, and determining the opening difference value between it and the current dangerous opening threshold; setting the opening and closing adjustment coefficient of the plug valve based on the opening difference value, and adaptively adjusting and controlling the opening and closing working conditions of the plug valve based on it. This invention dynamically quantifies the dangerous threshold by constructing a mathematical fitting model, and intelligently switches the opening and closing control mode of the plug valve by analyzing the opening difference, significantly improving the reliability, sealing life and safety of the valve under extreme pressure.

[0037] Finally, it should be noted that those skilled in the art can obviously make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for adaptive opening and closing control of a plug valve based on pressure, characterized in that, include: Obtain CFD simulation data of the plug valve and analyze the CFD simulation data to determine the critical opening value of the plug valve under different inlet pressure values. The critical opening value data are analyzed to determine the dangerous opening threshold data of the plug valve, and a mathematical fitting model is constructed based on the valve inlet pressure data and the dangerous opening threshold data. Determine the current inlet pressure of the plug valve, and determine the current dangerous opening threshold of the plug valve based on the current inlet pressure and the mathematical fitting model. Determine the current opening value of the plug valve, and analyze the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value; The opening and closing adjustment coefficient of the plug valve is set based on the opening degree difference value, and the opening and closing working conditions of the plug valve are adaptively adjusted and controlled based on the opening and closing adjustment coefficient.

2. The adaptive opening and closing control method for a plug valve according to claim 1, characterized in that, The process of acquiring CFD simulation data of the plug valve and analyzing the CFD simulation data to determine the critical opening value of the plug valve under different inlet pressure values ​​includes: A three-dimensional model of the plug valve was established for CFD simulation, and CFD simulation data of the plug valve was obtained. The CFD simulation data included the internal flow field parameters of the plug valve at different valve openings calculated for different inlet pressures. Extract the physical quantities characterizing the plug valve's dangerous state from the internal flow field parameters. These physical quantities include the maximum fluid velocity at the throttling point, wall shear force, turbulent kinetic energy, and pressure fluctuation amplitude. Determine the pre-set sub-safety thresholds for each physical quantity, and calculate the comprehensive safety value of the plug valve based on the physical quantity and the corresponding sub-safety thresholds. Determine the pre-set comprehensive safety threshold, and determine the valve opening degree corresponding to the comprehensive safety value of the plug valve being greater than or equal to the comprehensive safety threshold; These determined valve openings are then used as the critical opening values ​​for the plug valve under different inlet pressure values.

3. The method for adaptive opening and closing control of a plug valve according to claim 2, characterized in that, The formula for calculating the overall safety value of the plug valve is as follows: ， Where S is the overall safety value of the plug valve, wi is the preset weight of the i-th physical quantity, Xi is the i-th physical quantity, Yi is the sub-safety threshold corresponding to the i-th physical quantity, and n is the number of types of physical quantities.

4. The adaptive opening and closing control method for a plug valve according to claim 1, characterized in that, The analysis of critical opening value data to determine the dangerous opening threshold data of the plug valve includes: Determine the pre-set safety factor, and multiply the safety factor by the critical opening value data to obtain the dangerous opening threshold data of the plug valve.

5. The adaptive opening and closing control method for a plug valve according to claim 1, characterized in that, The mathematical fitting model constructed based on the valve inlet pressure data and the dangerous opening threshold data includes: Using the inlet pressure data as the independent variable and the critical opening threshold as the dependent variable, a mathematical fitting model of the inlet pressure value versus the critical opening threshold of the plug valve is constructed. The mathematical formula of the mathematical fitting model is as follows: θ=θ0+K (P P0) Where θ is the dangerous opening threshold of the plug valve, P0 is the reference inlet pressure value, θ0 is the dangerous opening threshold under the reference inlet pressure value, K is the fitting gain coefficient, and P is the inlet pressure value of the plug valve.

6. The adaptive opening and closing control method for a plug valve according to claim 1, characterized in that, The process of determining the current inlet pressure of the plug valve and, based on the current inlet pressure and a mathematical fitting model, determining the current dangerous opening threshold of the plug valve includes: Determine the current inlet pressure of the plug valve and input it into the mathematical fitting model for output, so as to obtain the current dangerous opening threshold of the plug valve.

7. The method for adaptive opening and closing control of a plug valve according to claim 1, characterized in that, The process of determining the current opening value of the plug valve and analyzing the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value includes: Determine the current opening value of the plug valve and calculate the difference between the current opening value and the current dangerous opening threshold to obtain the opening difference value. When the opening difference value is less than or equal to zero, the plug valve is determined to be in the dangerous opening range. When the opening difference value is greater than zero, the plug valve is determined to be in the safe opening range.

8. The method for adaptive opening and closing control of a plug valve according to claim 1, characterized in that, The method of setting the opening and closing adjustment coefficient of the plug valve based on the opening difference value includes: The end opening buffer zone is determined in advance to achieve a buffer seal at the end of the plug valve; When the opening difference is less than or equal to zero, the opening and closing adjustment coefficient of the plug valve is set to the first opening and closing adjustment coefficient. When the opening difference value is greater than zero and the current opening value of the plug valve is not in the end opening buffer zone, the opening and closing adjustment coefficient of the plug valve is set to the second opening and closing adjustment coefficient. When the current opening value of the plug valve is within the end opening buffer zone, regardless of the opening difference value, the opening and closing adjustment coefficient of the plug valve is set to the third opening and closing adjustment coefficient.

9. The method for adaptive opening and closing control of a plug valve according to claim 1, characterized in that, The adaptive adjustment and control of the opening and closing operating conditions of the plug valve based on the opening and closing adjustment coefficient includes: Determine the reference operating parameters of the actuator on the plug valve, and convert the opening and closing adjustment coefficients into control commands for the actuator; The reference operating parameters of the actuator are adjusted based on the control commands to obtain the adaptive opening and closing control strategy of the plug valve, and the opening and closing operating conditions of the plug valve are adaptively adjusted and controlled through the adaptive opening and closing control strategy.

10. A pressure adaptive opening and closing control system for a plug valve, characterized in that, include: The acquisition module is used to acquire CFD simulation data of the plug valve and analyze the CFD simulation data to determine the critical opening value of the plug valve under different inlet pressure values. The fitting module is used to analyze the critical opening value data, determine the dangerous opening threshold data of the plug valve, and build a mathematical fitting model based on the valve inlet pressure value data and the dangerous opening threshold data. The determination module is used to determine the current inlet pressure of the plug valve and, based on the current inlet pressure of the plug valve and a mathematical fitting model, determine the current dangerous opening threshold of the plug valve. The calculation module is used to determine the current opening value of the plug valve and analyze the difference between the current opening value and the current dangerous opening threshold to determine the opening difference value. The adjustment module is used to set the opening and closing adjustment coefficient of the plug valve based on the opening degree difference value, and to adaptively adjust and control the opening and closing working conditions of the plug valve based on the opening and closing adjustment coefficient.

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