Turbine compressor anti-surge valve adjusting method and system, electronic equipment and medium

Abstract

The invention discloses a method and system for adjusting an anti-surge valve of a turbine compressor, electronic equipment and a medium, and the method comprises the steps: monitoring the operation power of the compressor in real time, comparing the operation power with preset protection surge power and a power dead zone boundary, and automatically selecting an opening or closing adjusting mode of the anti-surge valve according to power deviation; a historical stable opening degree concept is introduced, the target opening degree is calculated in combination with a binary search algorithm, and the valve can be rapidly and accurately adjusted to the optimal position; the valve position is continuously optimized through an intelligent learning mechanism, and energy consumption is remarkably reduced while safe operation of the compressor is ensured; the problems that traditional anti-surge control is lagged in response and insufficient in adjusting precision are effectively solved, and the method has the advantages of being high in self-adaption and good in energy-saving effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turbomachinery control, in particular to a turbo-compressor anti-surge valve adjustment method, system, electronic device and medium. BACKGROUND

[0002] Surge is an inherent unstable operating condition of turbo-compressors. When the compressor operates at high pressure ratio and low flow rate, air flow separation and backflow occur, causing severe vibration and noise of the unit. If not controlled in time, it will cause serious damage to key components such as bearings, seals and impellers, and even cause serious accidents. At present, the most commonly used anti-surge method is to adjust the opening of the anti-surge valve to control the backflow, so that the working point of the compressor is away from the surge boundary. However, the traditional anti-surge control method (such as simple PID control or fixed boundary control) has the problems of slow adjustment speed, low precision and response lag. When the working condition changes rapidly, the compressor may still enter the surge area due to untimely control.

[0003] The main problems of the prior art are: Slow adjustment: the conventional control algorithm has slow response speed and cannot make a quick response in the moment when the surge risk occurs.

[0004] Insufficient precision: the control process is rough and it is difficult to accurately stabilize the working point of the compressor in the safe and efficient interval near the surge boundary. Either too conservative to cause high energy consumption or too aggressive to cause high risk.

[0005] Poor adaptability: for complex scenes with frequent changes in working conditions, the parameters of the traditional method are fixed and lack self-learning and adaptive ability, which is easy to cause system oscillation due to improper control. SUMMARY

[0006] Technical purpose: in view of the deficiencies of the existing turbo-compressor surge control, the present application discloses a turbo-compressor anti-surge valve adjustment method, system, electronic device and medium.

[0007] Technical scheme: in order to achieve the above technical purpose, the present application adopts the following technical scheme: A turbo-compressor anti-surge valve adjustment method, comprising the following steps: Obtaining the real-time operating power N of the compressor and the current opening Lc of the anti-surge valve, and keeping the anti-surge valve in an adjustable state; Determining the protection surge power Nswp and the power dead zone boundary Ndz according to the working condition parameters of the compressor; Calculating the real-time power deviation ΔN = N - Nswp; According to the comparison result of the power deviation ΔN and the power dead zone boundary Ndz, selectively executing the first adjustment mode or the second adjustment mode; wherein, when ΔN is less than a first threshold, the first regulation mode is executed to increase the anti-surge valve opening; when ΔN is greater than a second threshold, the second regulation mode is executed to decrease the anti-surge valve opening; The target opening Lt of the first regulation mode and / or the second regulation mode is calculated based on the current opening Lc and a historical stable opening Ls by a search algorithm; the historical stable opening Ls is the minimum opening of the anti-surge valve when the compressor is not surging last time.

[0008] Preferably, the search algorithm of the present application is a binary search algorithm, and the calculation of the target opening Lt satisfies the relationship: Lt = Ls + (Lc - Ls) / 2.

[0009] Preferably, the present application further comprises an asynchronous updating step after executing the second regulation mode: monitoring the operating state of the compressor within a safety time window T after the valve closing action is completed; if the first regulation mode is not triggered within the safety time window T, the historical stable opening Ls is updated to the current opening Lc after the valve closing action at the end of the time window; if the first regulation mode is triggered within the safety time window T, the historical stable opening Ls remains unchanged.

[0010] Preferably, the surge protection power Nswp of the present application is determined by calculating the real surge power Nsw under the current operating condition of the compressor and applying a surge protection coefficient a2, i.e. Nswp = Nsw × a2, where 0.5 < a2 < 1.

[0011] Preferably, the power dead zone boundary Ndz of the present application is determined by calculating the real surge power Nsw under the current operating condition of the compressor and applying a power dead zone coefficient a3, i.e. Ndz = Nsw × a3, where 0 < a3 < 0.1; and the first threshold is -Ndz, and the second threshold is Ndz.

[0012] Preferably, the present application judges whether the current opening Lc is less than or equal to 0 before starting the regulation. If yes, the anti-surge valve is opened to a preset opening, and the anti-surge valve is kept in a regulatable state.

[0013] The present application discloses a compressor anti-surge control system, comprising: a sensor module for acquiring the real-time operating power N and operating condition parameters of the compressor; an actuator module for regulating the opening of the anti-surge valve; a controller module in communication connection with the sensor module and the actuator module, the controller being configured to execute the above-mentioned method.

[0014] The application discloses an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the method when executing the program.

[0015] The application discloses a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the method.

[0016] Beneficial effects: the disclosed turbine compressor anti-surge valve adjusting method, system, electronic device and medium have the following beneficial effects: 1. The application takes real-time running power as a core control parameter, is more sensitive and direct in pre-judging surge than traditional pressure ratio-flow control, can quickly identify a slight deviation of a compressor running state through setting a protection surge power Nswp and a power dead zone Ndz, and immediately starts adjusting when a power deviation ΔN exceeds a dead zone boundary, thereby effectively preventing control lag, greatly improving response speed and control accuracy.

[0017] 2. The application introduces a "history stable opening degree Ls" and a search algorithm (such as binary search); the Ls records a minimum valve position of last safe operation, is a key reference for approaching a surge boundary but ensuring safety; when a valve needs to be opened (the first adjusting mode), a target opening degree Lt is calculated based on Lc and Ls, can quickly locate to an intermediate position which is more energy-saving than full opening and safer than a current opening degree; when a valve needs to be closed (the second adjusting mode), is also calculated based on Ls and Lc, aims to carefully and gradually close the valve, and finds a more energy-saving valve position. This method enables the system to constantly learn by itself, dynamically track and maintain operation near an optimal valve position, and significantly reduces unnecessary medium circulation and energy loss.

[0018] 3. The application sets a protection surge coefficient a2, establishes a safety buffer before an actual surge boundary, intervenes in control in advance, and enhances safety of the system; setting of a power dead zone coefficient a3 avoids frequent small movements of the valve near a stable working condition, and improves system stability and equipment life.

[0019] 4. The application uses binary search to optimize valve closing under a safety premise, sets a safety time window T for observation, and verifies stability through a safety timer, can sequentially and gradually control a working point at an optimal position near a surge boundary, and significantly reduces energy loss caused by anti-surge backflow. DETAILED DESCRIPTION

[0020] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth below. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. In fact, those skilled in the art will appreciate that various modifications and variations can be made within the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0021] A method for regulating the surge valve of a turbine compressor in this embodiment includes the following steps: S101: Obtain the real-time operating power N of the compressor (which can be directly measured by a power sensor or calculated from other parameters) and the current opening Lc of the surge valve. First, determine whether the current opening Lc is less than or equal to 0 (i.e., whether the valve is fully closed or in an inadjustable state). If so, control the surge valve to open to a preset opening to ensure that the valve is in an adjustable state, preparing for subsequent intelligent regulation, thereby reducing the response time and achieving the regulation of the surge valve. In an embodiment of the present invention, the preset opening is preferably 2%. If Lc ≤ 0, the valve is first opened to 2% of the opening within 10 seconds.

[0022] S102: According to the current operating condition parameters of the compressor such as intake pressure, temperature, and rotational speed, calculate the true surge power Nsw under the current operating conditions through a pre-stored compressor characteristic model or empirical formula.

[0023] Then, apply a protection surge coefficient a2, where 0.5 < a2 < 1, preferably 0.8 - 0.95, and calculate the protection surge power Nswp: Nswp = Nsw × a2. Nswp is the trigger line for control actions, and its value is less than Nsw, providing a safety margin.

[0024] At the same time, apply a power dead zone coefficient a3, where 0 < a3 < 0.1, preferably 0.02 - 0.05, and calculate the power dead zone boundary Ndz: Ndz = Nsw × a3. The setting of the dead zone prevents the valve from jittering frequently near the stable operating point.

[0025] S103: Calculate the deviation between the real-time operating power N of the compressor and the protection surge power Nswp: ΔN = N - Nswp.

[0026] Compare ΔN with the dead zone boundary: If ΔN < -Ndz, it indicates that the operating power has significantly dropped below the safety line and there is a risk of surge, and transfer to the first regulation mode (valve opening mode).

[0027] If ΔN > Ndz, it indicates that the operating power is much higher than the safety line and there is energy-saving space, and transfer to the second regulation mode (valve closing mode).

[0028] If -Ndz ≤ ΔN ≤ Ndz, it means that the running state is in the safe dead zone, and the current anti-surge valve opening is kept unchanged.

[0029] S104: According to the comparison result of ΔN and the dead zone boundary, the valve opening of the anti-surge valve is controlled; in this embodiment, the search algorithm adopts a binary search algorithm. The calculation of the target opening Lt satisfies the relationship: Lt = Ls + (Lc - Ls) / 2, Ls is the historical stable opening.

[0030] In the first adjustment mode, a valve position that is safer than the current opening but more energy-saving than simply opening the valve can be quickly found. After this adjustment, the historical stable opening Ls remains unchanged, because this time the valve is opened to deal with an emergency and cannot be used as a reference for the new stable minimum opening.

[0031] In the second adjustment mode, since the valve is closed, Lc is usually greater than Lt. This formula means that the target opening is gradually closing towards the historical stable opening Ls, but only a small step at a time, avoiding triggering surge due to closing the valve too quickly and violently, and finding the minimum opening of the valve under the premise of ensuring safety to reduce energy consumption.

[0032] S105: Asynchronously update the historical stable opening Ls. The dynamic update of parameter Ls is the core of the intelligent implementation of the method.

[0033] It is managed by a separate asynchronous safety confirmation process, and a safety time window T (for example, 30 seconds to 2 minutes) is started. During this time window T, the running state of the compressor is continuously monitored.

[0034] If the first adjustment mode is not triggered (i.e., there is no risk of surge) within the time window T, ΔN has never entered the risk area (ΔN <-Ndz); it means that this time the valve closing action is safe. At the end of the time window T, the historical stable opening Ls is updated to the current opening Lc after the closing action, which is used as the new benchmark for subsequent calculation of the valve opening.

[0035] If the first adjustment mode is triggered (i.e., there is a risk of surge) within the time window T, the historical stable opening Ls remains unchanged, and the system will immediately perform the opening operation. Through the cyclic execution of the above process, the system can continuously and adaptively optimize the opening of the anti-surge valve, so that the compressor always runs in the efficient area close to the surge boundary but absolutely safe.

[0036] The embodiment also provides a compressor anti-surge control system, which comprises: A sensor module is used to obtain the real-time running power N and working condition parameters of the compressor, such as pressure, temperature, flow rate, and rotating speed, which can be selected and set according to requirements.

[0037] Actuator module: an electric or pneumatic actuator used in the prior art to implement the opening and closing actions of the anti-surge valve, used to receive control instructions and accurately adjust the opening degree of the anti-surge valve.

[0038] Controller module: in communication connection with the sensor module and the actuator module. The controller module internally stores a computer program, which, when executed, causes the controller module to implement the method steps described in S101-S105 above. The controller module can be a PLC, a DCS or a dedicated embedded controller.

[0039] In addition, the embodiment of the present application also provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the intelligent adjustment method of the anti-surge valve of the turbo compressor when executing the program.

[0040] The present application provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the method when executing the program Similarly, the embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the program is executed by the processor to implement the intelligent adjustment method of the anti-surge valve of the turbo compressor.

[0041] The above is only the preferred embodiment of the present application, it should be pointed out that: for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of regulating a surge prevention valve of a turbo-compressor, characterized in that, The method comprises the following steps: acquiring real-time running power N of the compressor and current opening degree Lc of the anti-surge valve, and keeping the anti-surge valve in an adjustable state; determining protection surge power Nswp and power dead zone boundary Ndz according to working condition parameters of the compressor; calculating real-time power deviation ΔN = N - Nswp; selectively executing a first adjustment mode or a second adjustment mode according to a comparison result of the power deviation ΔN and the power dead zone boundary Ndz; wherein, when ΔN is less than a first threshold, the first adjustment mode is executed to increase the opening degree of the anti-surge valve; and when ΔN is greater than a second threshold, the second adjustment mode is executed to decrease the opening degree of the anti-surge valve; the target opening degree Lt of the first adjustment mode and / or the second adjustment mode is calculated based on the current opening degree Lc and a historical stable opening degree Ls by a search algorithm; and the historical stable opening degree Ls is the minimum opening degree of the anti-surge valve when the compressor is not surging last time.

2. The method of claim 1, wherein, The search algorithm is a binary search algorithm, and the calculation of the target opening degree Lt satisfies the relationship: Lt = Ls + (Lc - Ls) / 2.

3. The method of claim 2, wherein, After executing the second adjustment mode, an asynchronous updating step is further included: monitoring the running state of the compressor within a safety time window T after completing the valve closing action; if the first adjustment mode is not triggered within the safety time window T, the historical stable opening degree Ls is updated to the current opening degree Lc after the valve closing action at the end of the time window; and if the first adjustment mode is triggered within the safety time window T, the historical stable opening degree Ls remains unchanged.

4. The method of claim 1, wherein, The protection surge power Nswp is determined by calculating the real surge power Nsw under the current working condition of the compressor, and applying a protection surge coefficient a2, i.e. Nswp = Nsw × a2, wherein 0.5 < a2 < 1.

5. The method of claim 1, wherein, The power dead zone boundary Ndz is determined by calculating the real surge power Nsw under the current working condition of the compressor, and applying a power dead zone coefficient a3, i.e. Ndz = Nsw × a3, wherein 0 < a3 < 0.1; and the first threshold is -Ndz, and the second threshold is Ndz.

6. The method of claim 1, wherein, Before starting the adjustment, it is judged whether the current opening degree Lc is less than or equal to 0; if yes, the anti-surge valve is controlled to open to a preset opening degree, and the anti-surge valve is kept in the adjustable state.

7. A compressor anti-surge control system characterized by, The method comprises: a sensor module for acquiring real-time running power N of the compressor and working condition parameters; an actuator module for adjusting the opening degree of the anti-surge valve; a controller module in communication connection with the sensor module and the actuator module, and the controller is configured to execute the method as claimed in any one of claims 1 to 6.

8. An electronic device, comprising: The computer program is stored in the memory and executable on the processor, and the processor executes the program to implement the method as claimed in any one of claims 1 to 6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the method as claimed in any one of claims 1 to 6.