Centrifugal air compressor surge control method, system, electronic device and storage medium

Abstract

The application discloses a centrifugal air compressor surge control method, system, electronic equipment and storage medium, and the centrifugal air compressor surge control method comprises the following steps: obtaining the exhaust pressure variation intensity of a centrifugal air compressor; performing classified control according to the obtained exhaust pressure variation intensity value; when it is detected that the exhaust pressure variation intensity is less than a set maximum pressure variation threshold value and greater than a set minimum pressure variation threshold value, switching the anti-surge valve to an anti-surge automatic control mode; under the anti-surge automatic control, slowly opening the anti-surge valve to introduce airflow into the atmosphere and discharge the airflow; after continuously detecting that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold value and maintaining the set time, switching the anti-surge valve out of the anti-surge automatic control mode and restoring the anti-surge valve to a normal control mode; and when it is detected that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold value, switching the anti-surge valve to a surge protection mode and switching to a surge fast-opening mode. The application can improve the stability of the centrifugal air compressor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air compressors, and relates to a centrifugal air compressor, in particular to a centrifugal air compressor surge control method and system, an electronic device and a storage medium. BACKGROUND

[0002] Surge is a unique phenomenon of centrifugal air compressor running at a certain working condition. When the air flow entering the air compressor cannot make the air compressor produce enough pressure, so that the pressure of the external system (external pipeline) is greater than the pressure inside the air compressor, causing the check valve to close. At this time, the air compressor has no output, and the air accumulates inside the air compressor, and the pressure continues to increase, until the accumulated pressure is greater than the pressure of the external system, the internal pressure of the air compressor bursts the check valve and discharges. After the gas is discharged, there is not enough air to maintain continuous output of the air compressor, the internal pressure of the air compressor decreases, the check valve closes, and the air re-accumulates inside the air compressor until the accumulated pressure is sufficient, and then discharges again, so on and so forth, resulting in a dramatic fluctuation of output pressure and motor load, frequent operation of the check valve, and a loud noise from the machine. This phenomenon is called surge.

[0003] As can be seen, when the exhaust flow of the centrifugal air compressor suddenly decreases or decreases to a certain extent, the airflow backflow caused may cause the unit to surge. The strong vibration caused by surge to the unit will cause serious damage to the bearings, seals and other parts of the unit.

[0004] The current surge control method for centrifugal air compressors is based on the positive correlation between exhaust flow and main motor current. The fluctuation of exhaust flow is indirectly judged by detecting the change rate of main motor current. Due to the indirect detection method, the cost needs to be increased and there is a delay in detection. The surge is detected by detecting the fluctuation of the exhaust pressure caused by the back and forth movement of the airflow when the surge occurs, so as to detect, prevent and eliminate the surge and protect the function.

[0005] Therefore, there is an urgent need to design a new centrifugal air compressor control method to overcome at least some of the above-mentioned defects of the existing centrifugal air compressor control method. SUMMARY

[0006] The present application provides a centrifugal air compressor surge control method, system, electronic device and storage medium, which can improve the stability of the centrifugal air compressor.

[0007] To solve the above technical problems, according to one aspect of the present application, the following technical scheme is adopted:

[0008] A centrifugal air compressor surge control method, the surge control method comprising:

[0009] Obtaining the exhaust pressure variation intensity of the centrifugal air compressor, and performing classification control according to the obtained exhaust pressure variation intensity value:

[0010] When it is detected that the exhaust pressure variation intensity is less than the set maximum pressure variation threshold value and greater than the set minimum pressure variation threshold value, the anti-surge valve is switched to an anti-surge automatic control mode; in the anti-surge automatic control mode, the anti-surge valve is automatically controlled to slowly open, the exhaust flow is increased to eliminate the exhaust pressure variation value, and the airflow is introduced into the atmosphere and discharged;

[0011] After continuously detecting that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold value and maintaining the set time, the anti-surge valve exits the anti-surge automatic control mode, and the anti-surge valve returns to a normal control mode; in the normal control mode, the anti-surge valve is completely closed, and the guide vane valve is controlled to load or unload; only when the set surge condition is triggered, the anti-surge automatic control mode is entered;

[0012] When it is detected that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold value, the anti-surge valve enters a surge protection mode and is switched to a surge fast opening mode; in the surge fast opening mode, the opening degree of the given anti-surge is calculated; the calculated given anti-surge opening degree is taken as the given value of the anti-surge valve opening degree, so that the anti-surge valve is rapidly opened; after the anti-surge valve is opened, the surge disappears, the anti-surge valve is slowly closed, and the unit returns to the normal operation mode.

[0013] As an embodiment of the present application, in the step of calculating the opening degree of the given anti-surge, the calculation method of the opening degree of the given anti-surge is: Wherein, Ps is the set value of the exhaust pressure, and VS is the anti-surge valve emptying opening degree.

[0014] As an embodiment of the present application, the surge control method comprises a guide vane valve minimum anti-surge opening degree control step; specifically comprising:

[0015] In the state of normal operation of the unit, the anti-surge valve is fully closed;

[0016] When the exhaust pressure is continuously greater than the set pressure, the controller automatically controls the guide vane valve opening degree to continuously decrease; when the exhaust flow decreases to the set value, the critical point of triggering the surge is entered, and at this time, the controller detects that the exhaust pressure variation value also starts to increase;

[0017] When the exhaust pressure variation ΔP is greater than the set allowable pressure variation value ΔP min , the current given guide vane valve opening degree V min is taken as the minimum anti-surge opening degree of the guide vane valve; the guide vane valve maintains the given value of the minimum anti-surge opening degree, and is switched to control the user exhaust flow;

[0018] When the user gas consumption starts to increase, the anti-surge valve opening degree is first closed, and after the anti-surge valve is fully closed, the controller automatically controls the guide vane valve to slowly increase.

[0019] As an embodiment of the present application, the step of obtaining the exhaust pressure variation intensity of the centrifugal air compressor specifically comprises:

[0020] The exhaust pressure values are collected by the controller, and the exhaust pressure values collected in each scanning cycle in time sequence are recorded as P1, P2, P3, …, Pn in turn;

[0021] The difference between the exhaust pressures collected in adjacent two times is calculated in real time in the PLC controller as the intensity value of the pressure variation, and is recorded as ΔP1, ΔP2, ΔP3, …, ΔPn;

[0022] The ΔPn>0 cumulative value S and the number m in n times of the controller scanning cycle are taken;

[0023] The obtained pressure variation intensity is calculated as: The value of n is set according to the control scanning cycle and the unit characteristics test; the ΔPn>0 cumulative value is taken to avoid misjudgment caused by unloading, pipeline leakage, and sudden fluctuation of user gas consumption.

[0024] According to another aspect of the present application, the following technical solution is adopted: a centrifugal air compressor surge control system, the surge control system comprising:

[0025] An exhaust pressure variation intensity acquisition module is configured to obtain the exhaust pressure variation intensity of the centrifugal air compressor;

[0026] An exhaust pressure variation intensity control module is configured to perform classified control according to the obtained exhaust pressure variation intensity value:

[0027] When it is detected that the exhaust pressure variation intensity is less than a set maximum pressure variation threshold value and greater than a set minimum pressure variation threshold value, the anti-surge valve is switched to an anti-surge automatic control mode; in the anti-surge automatic control mode, the anti-surge valve is automatically controlled to slowly open, the exhaust flow is increased to eliminate the exhaust pressure variation value, and the gas flow is introduced into the atmosphere to be discharged;

[0028] After continuously detecting that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold value and maintaining the set time, the anti-surge valve exits the anti-surge automatic control mode, and the anti-surge valve returns to a normal control mode; in the normal control mode, the anti-surge valve is completely closed, and the loading or unloading is controlled through the guide vane valve; only when the set surge condition is triggered, the anti-surge automatic control mode is entered;

[0029] When it is detected that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold value, the anti-surge valve enters a surge protection mode and is switched to a surge fast opening mode; in the surge fast opening mode, the opening degree of the anti-surge valve is calculated; the calculated opening degree of the anti-surge valve is taken as the opening degree given value of the anti-surge valve, so that the anti-surge valve is rapidly opened; after the anti-surge valve is opened, the surge disappears, the anti-surge valve is slowly closed, and the unit returns to the normal operation mode.

[0030] As one embodiment of the present invention, the method for calculating a given anti-surge opening is as follows: Among them, P s V is the exhaust pressure setpoint. S To prevent the valve from venting.

[0031] In one embodiment of the present invention, the surge control system includes a guide vane valve minimum anti-surge opening control module, which controls the minimum anti-surge opening of the guide vane valve. Under normal unit operation, the anti-surge valve is fully closed. When the exhaust pressure continuously exceeds a set pressure, the controller automatically controls the guide vane valve opening to continuously decrease. When the exhaust volume decreases to a set value, a surge trigger point is reached, at which point the controller detects that the exhaust pressure change also begins to increase. When the exhaust pressure change ΔP exceeds the set allowable pressure change value ΔP... min At that time, the currently given guide vane valve opening V will be... min As the minimum anti-surge opening of the guide vane valve; the guide vane valve maintains the minimum anti-surge opening setpoint and switches to the anti-surge valve to control the user's exhaust flow; when the user's gas consumption begins to increase, the anti-surge valve opening is closed first, and after the anti-surge valve is fully closed, the controller automatically controls the guide vane valve to slowly increase.

[0032] In one embodiment of the present invention, the exhaust pressure transformer intensity acquisition module collects exhaust pressure values ​​through a controller. The exhaust pressure values ​​collected in each scanning cycle are sequentially recorded as: P1, P2, P3, ..., Pn. The difference between two adjacent exhaust pressure values ​​collected is calculated in real time within the PLC controller as the pressure transformer intensity value, recorded as: ΔP1, ΔP2, ΔP3, ..., ΔPn. The accumulated value S for ΔPn>0 within n controller scanning cycles and the number of cycles m are taken. The calculated pressure transformer intensity is then obtained. The value of n is set based on the control scan cycle and unit characteristic test; the cumulative value of ΔPn>0 is to avoid misjudgment caused by unloading, pipeline leakage, or sudden fluctuations in user gas consumption.

[0033] According to another aspect of the present invention, the following technical solution is adopted: an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above method.

[0034] According to another aspect of the present invention, the following technical solution is adopted: a storage medium storing computer program instructions thereon, which, when executed by a processor, implement the steps of the above-described method.

[0035] The beneficial effects of this invention are as follows: the centrifugal air compressor surge control method, system, electronic equipment and storage medium proposed in this invention can improve the stability of centrifugal air compressor operation.

[0036] The present application reduces the dependence on the motor current signal in the control program, avoids losing the surge protection of the compressor due to the interference or loss of the current signal, and can automatically set the minimum opening degree of the guide vane valve to avoid the influence of the initial minimum anti-surge opening degree of the guide vane valve due to environmental temperature changes, unit loss and other factors. In addition, the present application proposes to automatically follow the size of the pressure change intensity for anti-surge protection, and slowly open the anti-surge valve when there is slight surge to avoid the increase of the surge intensity and the fluctuation of the user pipe network pressure.

[0037] The application can ensure driving magnetic suspension turbine, magnetic suspension centrifuge, magnetic suspension screw compressor, and magnetic suspension bearing high-speed driving, is simple to debug, small in size, low in cost, and convenient for batch production and operation and debugging.

[0038] The present application can realize the anti-surge protection of the centrifugal compressor unit by calculating the pressure change of the exhaust pressure, can automatically adapt to the minimum anti-surge opening degree of the guide vane valve due to environmental temperature changes, and can perform classified control according to the surge intensity, performs anti-surge control to stabilize the pipe network pressure when the surge intensity is low, and immediately opens the anti-surge valve to protect the unit when a high-intensity surge occurs. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The figure is a flowchart of the surge control method of the centrifugal air compressor in an embodiment of the present application.

[0040] Figure 2 The figure is a flowchart of the surge control method of the centrifugal air compressor in an embodiment of the present application.

[0041] Figure 3 The figure is a flowchart of the minimum anti-surge opening degree control step of the guide vane valve in an embodiment of the present application.

[0042] Figure 4 The figure is a composition schematic diagram of the surge control system of the centrifugal air compressor in an embodiment of the present application.

[0043] Figure 5 The figure is a composition schematic diagram of the electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0045] In order to further understand the present application, the preferred embodiments of the present application will be described below in conjunction with the embodiments, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present application, and are not limitations of the claims of the present application.

[0046] The description of this part is only for several typical embodiments, and the application is not limited to the scope of the embodiment description. The same or similar prior art means and some technical features in the embodiments are mutually replaced, which is within the description and protection scope of the application.

[0047] The description of the steps in each embodiment in the specification is only for convenience of description, and the implementation mode of the application is not limited by the order of the steps.

[0048] The "connection" in the specification includes both direct connection and indirect connection.

[0049] The application discloses a centrifugal air compressor surge control method, Figure 1 The flow chart of the centrifugal air compressor surge control method in an embodiment of the application is shown in Figure 1. Figure 1 The surge control method comprises the following steps:

[0050] The exhaust pressure variation intensity of the centrifugal air compressor is obtained, and classification control is performed according to the obtained exhaust pressure variation intensity value:

[0051] When it is detected that the exhaust pressure variation intensity is less than the set maximum pressure variation threshold value and greater than the set minimum pressure variation threshold value, the anti-surge valve is switched to an anti-surge automatic control mode; in the anti-surge automatic control mode, the anti-surge valve is automatically controlled to slowly open, the exhaust flow is increased to eliminate the exhaust pressure variation value, and the airflow is introduced into the atmosphere and discharged.

[0052] After continuously detecting that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold value and maintaining the set time, the anti-surge valve exits the anti-surge automatic control mode, and the anti-surge valve returns to a normal control mode; in the normal control mode, the anti-surge valve is completely closed, and the load or unloading is controlled through the guide vane valve; only when the set surge condition is triggered, the anti-surge automatic control mode is entered.

[0053] When it is detected that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold value, the anti-surge valve enters a surge protection mode and is switched to a surge quick opening mode; in the surge quick opening mode, the opening degree of the given anti-surge valve is calculated (in an embodiment, the way of calculating the opening degree of the given anti-surge valve is as follows: Wherein, P s is a set value of the exhaust pressure, and V S is the opening degree of the anti-surge valve); the calculated opening degree V i of the given anti-surge valve is taken as the given value of the opening degree of the anti-surge valve, so that the anti-surge valve is quickly opened; after the anti-surge valve is opened, the surge disappears, the anti-surge valve is slowly closed, and the unit returns to the normal operation mode.

[0054] Figure 2 The flow chart of the centrifugal air compressor surge control method in an embodiment of the application is shown in Figure 1. Figure 2In one use scenario of the present application, the flowchart of the surge control method is as shown in Figure 2 .

[0055] In one embodiment of the present application, the surge control method comprises a minimum anti-surge opening degree control step of the guide vane valve. Figure 3 The flowchart of the minimum anti-surge opening degree control step of the guide vane valve in one embodiment of the present application is shown in Figure 3 , and the minimum anti-surge opening degree control step of the guide vane valve specifically comprises:

[0056] In the normal operation state of the unit, the anti-surge valve is fully closed.

[0057] When the exhaust pressure continuously exceeds the set pressure, the controller automatically controls the guide vane valve opening to continuously decrease; when the exhaust volume decreases to the set value, the critical point of triggering surge is reached, at which time the controller detects that the exhaust pressure variation value also starts to increase.

[0058] When the exhaust pressure variation ΔP is greater than the set allowable pressure variation value ΔP min , the current given guide vane valve opening V min is taken as the minimum anti-surge opening degree of the guide vane valve; the guide vane valve maintains the anti-surge minimum opening degree given value, and switches to the anti-surge valve control user exhaust flow.

[0059] When the user gas consumption starts to increase, the anti-surge valve opening is first closed, and after the anti-surge valve is fully closed, the controller automatically controls the guide vane valve to slowly increase.

[0060] In one embodiment of the present application, the step of obtaining the exhaust pressure variation intensity of the centrifugal air compressor specifically comprises:

[0061] The exhaust pressure values are collected by the controller, and the exhaust pressure values collected in each scanning period in time sequence are recorded as P1, P2, P3, …, Pn in turn.

[0062] The difference between the exhaust pressures collected in the adjacent two times is calculated in real time in the PLC controller as the intensity value of the pressure variation, and is recorded as ΔP1, ΔP2, ΔP3, …, ΔPn.

[0063] The ΔPn>0 cumulative value S and the number m in n times of the controller scanning period are taken.

[0064] The obtained pressure variation intensity is calculated, where the value of n is set according to the control scanning period and the unit characteristic test; the cumulative ΔPn>0 is to avoid misjudgment caused by unloading, pipeline leakage, and sudden fluctuations in user gas consumption.

[0065] The present application further discloses a centrifugal air compressor surge control system, Figure 4Figure 1 is a schematic diagram of a centrifugal air compressor surge control system according to an embodiment of the present application. As shown in Figure 1, the centrifugal air compressor surge control system comprises an exhaust pressure variation intensity acquisition module 1 and an exhaust pressure variation intensity control module 2. Figure 4

[0066] The exhaust pressure variation intensity acquisition module 1 is configured to acquire the exhaust pressure variation intensity of the centrifugal air compressor, and the exhaust pressure variation intensity control module 2 is configured to perform classification control according to the acquired exhaust pressure variation intensity value.

[0067] When it is detected that the exhaust pressure variation intensity is less than the set maximum pressure variation threshold value and greater than the set minimum pressure variation threshold value, the exhaust pressure variation intensity control module 2 controls the anti-surge valve to switch to an anti-surge automatic control mode. In the anti-surge automatic control mode, the anti-surge valve is automatically controlled to slowly open, the exhaust flow is increased to eliminate the exhaust pressure variation value, and the airflow is introduced into the atmosphere to be discharged.

[0068] After continuously detecting that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold value and maintaining the set time, the exhaust pressure variation intensity control module 2 controls the anti-surge valve to exit the anti-surge automatic control mode, and the anti-surge valve returns to a normal control mode. In the normal control mode, the anti-surge valve is completely closed, and the load or unloading is controlled by the guide vane valve. Only when the set surge condition is triggered, the anti-surge automatic control mode is entered.

[0069] When it is detected that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold value, the exhaust pressure variation intensity control module 2 controls the anti-surge valve to enter a surge protection mode and switch to a surge fast opening mode. In the surge fast opening mode, the opening degree of the anti-surge valve is calculated (in an embodiment, the way of calculating the opening degree of the anti-surge valve is as follows: wherein P s is the set value of the exhaust pressure, V S is the opening degree of the anti-surge valve for venting), and the calculated opening degree of the anti-surge valve V i is taken as the set value of the opening degree of the anti-surge valve, so that the anti-surge valve is rapidly opened. After the anti-surge valve is opened, the surge disappears, and the anti-surge valve is slowly closed, and the unit returns to the normal operation mode.

[0070] In an embodiment of the present application, the surge control system can further comprise a guide vane valve minimum anti-surge opening degree control module configured to control the minimum anti-surge opening degree of the guide vane valve. In the normal operation state of the unit, the anti-surge valve is fully closed. When the exhaust pressure continuously exceeds the set pressure, the controller automatically controls the opening degree of the guide vane valve to continuously decrease. When the exhaust volume decreases to the set value, the critical point of triggering the surge is reached, at which time the controller detects that the exhaust pressure variation value also starts to increase. When the exhaust pressure variation ΔP min is greater than the set allowable pressure variation value ΔP min ​As the minimum anti-surge opening of the guide vane valve; the guide vane valve maintains the minimum anti-surge opening setpoint and switches to the anti-surge valve to control the user's exhaust flow; when the user's gas consumption begins to increase, the anti-surge valve opening is closed first, and after the anti-surge valve is fully closed, the controller automatically controls the guide vane valve to slowly increase.

[0071] In one embodiment of the present invention, the exhaust pressure transformer intensity acquisition module 2 can collect exhaust pressure values ​​through a controller, and record the exhaust pressure values ​​collected in each scanning cycle in chronological order as: P1, P2, P3, ..., Pn; the difference between two adjacent exhaust pressures collected in real time is calculated in the PLC controller as the intensity value of the pressure transformer, and recorded as: ΔP1, ΔP2, ΔP3, ..., ΔPn; the accumulated value S of ΔPn>0 within n controller scanning cycles and the number m are taken; the calculated pressure transformer intensity is: The value of n is set based on the control scan cycle and unit characteristic test; the cumulative value of ΔPn>0 is to avoid misjudgment caused by unloading, pipeline leakage, or sudden fluctuations in user gas consumption.

[0072] This invention also discloses an electronic device, Figure 5 This is a schematic diagram of the composition of an electronic device according to an embodiment of the present invention; please refer to [link / reference]. Figure 5 At the hardware level, the electronic device includes a memory, a processor, and at least one network interface; the processor may be a microprocessor, and the memory may include main memory, such as random access memory (RAM) or non-volatile memory. Of course, the electronic device may also include other hardware as needed.

[0073] The processor, network interface, and memory are interconnected via an internal bus, which can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus may include an address bus, a data bus, a control bus, etc. The memory stores programs (including operating system programs and application programs); the programs may include program code, which may include computer operation instructions. The memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0074] In one embodiment, the processor can read the corresponding program from non-volatile memory into memory and then run it; the processor can execute the program stored in memory and specifically perform the following operations (e.g. Figure 1 As shown):

[0075] Obtain the discharge pressure variation intensity of the centrifugal air compressor, and classify and control it according to the obtained discharge pressure variation intensity value:

[0076] When the exhaust pressure variation intensity is detected to be less than the set maximum pressure variation threshold value and greater than the set minimum pressure variation threshold value, the anti-surge valve is switched to an anti-surge automatic control mode; in the anti-surge automatic control mode, the anti-surge valve is automatically controlled to slowly open, the exhaust flow to the air is increased to eliminate the exhaust pressure variation value, and the airflow is introduced into the atmosphere to be discharged;

[0077] After the exhaust pressure variation intensity is continuously detected to be less than the set minimum pressure variation threshold value and maintained for a set time, the anti-surge valve exits the anti-surge automatic control mode, and the anti-surge valve returns to a normal control mode; in the normal control mode, the anti-surge valve is completely closed, and the loading or unloading is controlled through the guide vane valve; only when the set surge condition is triggered, the anti-surge automatic control mode is entered;

[0078] When the exhaust pressure variation intensity is detected to be greater than the set maximum pressure variation threshold value, the anti-surge valve enters a surge protection mode and is switched to a surge quick opening mode; in the surge quick opening mode, the opening degree of the anti-surge valve is calculated: Wherein, P s is a set value of the exhaust pressure, V S is the opening degree of the anti-surge valve; V i is taken as the given value of the opening degree of the anti-surge valve, so that the anti-surge valve is rapidly opened; after the anti-surge valve is opened, the surge disappears, the anti-surge valve is slowly closed, and the unit returns to the normal operation mode.

[0079] The application further discloses a storage medium, which has computer program instructions stored thereon, and the computer program instructions are executed by a processor to realize the following steps (as shown in Figure 1 ):

[0080] The exhaust pressure variation intensity of the centrifugal air compressor is acquired, and classification control is performed according to the acquired exhaust pressure variation intensity value:

[0081] When the exhaust pressure variation intensity is detected to be less than the set maximum pressure variation threshold value and greater than the set minimum pressure variation threshold value, the anti-surge valve is switched to an anti-surge automatic control mode; in the anti-surge automatic control mode, the anti-surge valve is automatically controlled to slowly open, the exhaust flow to the air is increased to eliminate the exhaust pressure variation value, and the airflow is introduced into the atmosphere to be discharged;

[0082] After the exhaust pressure variation intensity is continuously detected to be less than the set minimum pressure variation threshold value and maintained for a set time, the anti-surge valve exits the anti-surge automatic control mode, and the anti-surge valve returns to a normal control mode; in the normal control mode, the anti-surge valve is completely closed, and the loading or unloading is controlled through the guide vane valve; only when the set surge condition is triggered, the anti-surge automatic control mode is entered;

[0083] When the exhaust pressure variation intensity is detected to be greater than the set maximum pressure variation threshold value, the anti-surge valve enters a surge protection mode and is switched to a surge quick opening mode; in the surge quick opening mode, the opening degree of the anti-surge valve is calculated: Wherein, P s V is the exhaust pressure set value, S V is the anti-surge valve opening degree; V i is taken as the anti-surge valve opening degree given value, so that the anti-surge valve is quickly opened; after the anti-surge valve is opened, the surge disappears, the anti-surge valve is slowly closed, and the unit returns to the normal operation mode.

[0084] In summary, the centrifugal air compressor surge control method, system, electronic equipment and storage medium provided by the application can improve the stability of the centrifugal air compressor.

[0085] The application controls the surge of the compressor by using the exhaust pressure variation intensity, reduces the dependence on the motor current signal in the control program, avoids losing the surge protection of the compressor due to the interference or loss of the current signal, and can automatically set the minimum anti-surge opening degree of the guide vane valve to avoid the influence of the initial minimum anti-surge opening degree of the guide vane valve due to the environmental temperature change, unit loss and other factors. In addition, the application proposes to automatically follow the size of the pressure variation intensity to perform anti-surge protection, and slowly open the anti-surge valve when there is slight surge, thereby avoiding the increase of the surge intensity and the fluctuation of the user pipe network pressure.

[0086] The application can ensure the driving of the magnetic suspension turbine, the magnetic suspension centrifuge, the magnetic suspension screw compressor and the magnetic suspension suitable for magnetic suspension bearing high-speed driving, is simple to debug, small in size, low in cost and convenient for batch production and operation and debugging.

[0087] The application can realize the anti-surge protection of the centrifugal compressor unit by only calculating the pressure variation of the exhaust pressure, can automatically adapt to the minimum anti-surge opening degree of the guide vane valve due to the environmental temperature change, and can perform classified control according to the surge intensity, when the surge intensity is low, the anti-surge control is performed to stabilize the pipe network pressure, and when the high-intensity surge occurs suddenly, the anti-surge valve can be immediately opened to protect the unit.

[0088] It should be noted that the present application can be implemented in software and / or a combination of software and hardware; for example, an application specific integrated circuit (ASIC), a general purpose computer or any other similar hardware device can be used. In some embodiments, the software program of the present application can be executed by a processor to implement the above steps or functions. Similarly, the software program of the present application (including the related data structure) can be stored in a computer readable recording medium; for example, a RAM memory, a magnetic or optical drive or a soft disk and the like. In addition, some steps or functions of the present application can be implemented by hardware; for example, as a circuit cooperating with the processor to execute the respective steps or functions.

[0089] The technical features of the above-described embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations are described. However, any combination of the technical features is considered to be within the scope of the present specification.

[0090] The description and applications of the present application are illustrative, and not intended to limit the scope of the present application. The effects and advantages of the embodiments described above can be disturbed by various factors, and the description of the effects and advantages is not intended to limit the embodiments. Variations and modifications of the embodiments disclosed herein can be possible, and alternative and equivalent variations and modifications of the embodiments are known to those of ordinary skill in the art. It should be clear to those of ordinary skill in the art that the present application can be implemented in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics of the present application. Other variations and modifications of the embodiments disclosed herein can be made without departing from the scope and spirit of the present application.

Claims

1. A surge control method for a centrifugal air compressor, characterized by, The surge control method comprises: Obtaining the exhaust pressure variation intensity of the centrifugal air compressor, and performing classified control according to the obtained exhaust pressure variation intensity value: When it is detected that the exhaust pressure variation intensity is less than the set maximum pressure variation threshold value and greater than the set minimum pressure variation threshold value, the anti-surge valve is switched to an anti-surge automatic control mode; in the anti-surge automatic control mode, the anti-surge valve is automatically controlled to slowly open, the exhaust flow to the air is increased to eliminate the exhaust pressure variation value, and the airflow is introduced into the atmosphere and discharged; After it is continuously detected that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold value and is maintained for a set time, the anti-surge valve exits the anti-surge automatic control mode, and the anti-surge valve returns to a normal control mode; in the normal control mode, the anti-surge valve is completely closed, and the guide vane valve is controlled to load or unload; only when a set surge condition is triggered, the anti-surge automatic control mode is entered; When it is detected that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold value, the anti-surge valve enters a surge protection mode and is switched to a surge fast opening mode; in the surge fast opening mode, the opening degree of the anti-surge valve is calculated; the calculated opening degree of the anti-surge valve is taken as the opening degree given value of the anti-surge valve, so that the anti-surge valve is rapidly opened; after the anti-surge valve is opened, the surge disappears, the anti-surge valve is slowly closed, and the unit returns to the normal operation mode; The step of obtaining the exhaust pressure variation intensity of the centrifugal air compressor specifically comprises: The exhaust pressure values are collected by the controller, and the exhaust pressure values collected in each scanning period in time sequence are recorded as P1, P2, P3,..., Pn in time sequence; The difference between the exhaust pressures collected in two adjacent times is calculated in real time in the PLC controller as the intensity value of the pressure variation, and is recorded as ΔP1, ΔP2, ΔP3,..., ΔPn; The accumulated value S and the number m of ΔPn>0 in n scanning periods of the controller are taken; Calculated: compressive strength Wherein, n value is set according to control scanning period and unit characteristic test; ΔPn>0 is accumulated to avoid false judgment caused by unloading, pipeline leakage and sudden fluctuation of user gas consumption; The surge control method comprises a guide vane valve minimum anti-surge opening degree control step, and specifically comprises: In the state of normal operation of the unit, the anti-surge valve is fully closed; When the exhaust pressure continuously exceeds the set pressure, the controller automatically controls the guide vane valve opening degree to continuously decrease; when the exhaust flow decreases to the set value, the critical point of triggering the surge is entered, and at this time, the controller detects that the exhaust pressure variation value also starts to increase; When the exhaust pressure variation ΔP is greater than the set allowable pressure variation value ΔP min , the current given guide vane valve opening V min is set as the minimum anti-surge opening of the guide vane valve; the guide vane valve is maintained at the anti-surge minimum opening value, and the user exhaust flow is switched to the anti-surge valve control When the user gas consumption starts to increase, the anti-surge valve opening degree is first closed, and after the anti-surge valve is fully closed, the controller automatically controls the guide vane valve to slowly increase.

2. The centrifugal air compressor surge control method according to claim 1, characterized in that: The step of calculating the opening degree of the anti-surge valve is performed in the following manner: wherein P s is the set value of the exhaust pressure, V S is the opening degree of the anti-surge valve, and ΔP is the pressure variation intensity.

3. A centrifugal air compressor surge control system characterized by, The surge control system comprises: An exhaust pressure variation intensity acquisition module is configured to obtain the exhaust pressure variation intensity of the centrifugal air compressor; An exhaust pressure variation intensity control module is configured to perform classified control according to the obtained exhaust pressure variation intensity value: When it is detected that the exhaust pressure variation intensity is less than the set maximum pressure variation threshold value and greater than the set minimum pressure variation threshold value, the anti-surge valve is switched to an anti-surge automatic control mode; in the anti-surge automatic control mode, the anti-surge valve is automatically controlled to slowly open, the exhaust flow to the air is increased to eliminate the exhaust pressure variation value, and the airflow is introduced into the atmosphere and discharged; After continuously detecting that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold and maintaining the set time, the anti-surge valve exits the anti-surge automatic control mode, and the anti-surge valve returns to the normal control mode; in the normal control mode, the anti-surge valve is completely closed, and the loading or unloading is controlled through the guide vane valve; only when the set surge condition is triggered, the anti-surge automatic control mode is entered; When detecting that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold, the anti-surge valve enters the surge protection mode and is switched to the surge fast opening mode; in the surge fast opening mode, the opening degree of the given anti-surge is calculated; the calculated given anti-surge opening degree is taken as the anti-surge valve opening degree given value, so that the anti-surge valve is rapidly opened; after the anti-surge is opened, the surge disappears, the anti-surge valve is slowly closed, and the unit returns to the normal operation mode; The surge control system comprises a guide vane valve minimum anti-surge opening control module, which is used to control the guide vane valve minimum anti-surge opening; in the state of normal operation of the unit, the anti-surge valve is fully closed; when the exhaust pressure continuously exceeds the set pressure, the controller automatically controls the guide vane valve opening to continuously decrease; when the exhaust volume decreases to the set value, the critical point of triggering the surge is reached, at which time the controller detects that the exhaust pressure variation value also starts to increase; when the exhaust pressure variation ΔP is greater than the set allowable pressure variation value ΔP min , the current given guide vane valve opening V min is taken as the minimum anti-surge opening of the guide vane valve; the guide vane valve keeps the minimum anti-surge opening given value, and switches to the anti-surge valve control user exhaust flow; when the user gas consumption starts to increase, the anti-surge valve opening is first closed, and after the anti-surge valve is fully closed, the controller automatically controls the guide vane valve to slowly increase; The exhaust pressure variation strength acquisition module acquires exhaust pressure values through the controller, and the exhaust pressure values acquired in each scanning period in time sequence are recorded as P1, P2, P3, …, Pn in turn; the difference between the exhaust pressures acquired in adjacent two times is calculated in real time in the PLC controller as the strength value of the pressure variation, and recorded as ΔP1, ΔP2, ΔP3, …, ΔPn; the ΔPn>0 cumulative value S and the number m in n times of the controller scanning periods are taken; and the obtained calculation result is the pressure variation strength Wherein, the n value is set according to the control scanning period and the unit characteristic test; the ΔPn>0 cumulative taking is to avoid the false judgment caused by unloading, pipeline leakage and sudden user gas fluctuation.

4. The centrifugal air compressor surge control system of claim 3, wherein: The anti-surge opening degree is calculated in the following manner: wherein P s is the exhaust pressure set value, V S is the anti-surge valve opening degree, and ΔP is the pressure variation strength.

5. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the computer program to implement the steps of the method of any one of claims 1 to 2.

6. A storage medium having stored thereon computer program instructions, characterized in that, The computer program instructions are executed by the processor to implement the steps of the method of any one of claims 1 to 2.

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