Control Method, Device, Electronic Equipment and Storage Medium for Compressor Unit

Abstract

An embodiment of the present invention provides a control method, device, electronic device, and storage medium for a compressor unit. The compressor unit includes a plurality of compressors connected in cascade. A blow-off valve is provided on the outlet side of one of the plurality of compressors, and an anti-surge valve is connected in a pipeline between the outlet side of one compressor and the inlet side of one compressor. The anti-surge valve is configured to allow a part of the gas on the outlet side to be guided to the inlet side in an open state. The control method includes: determining whether the anti-surge valve is in an open state in the next operating condition under the current operating condition of one compressor; when it is determined that the anti-surge valve will be placed in an open state in the next operating condition, controlling the blow-off valve to open; when it is determined that the blow-off valve is opened, controlling one compressor to end the current operating condition and enter the next operating condition. The solution of the embodiment of the present invention avoids the compressor trip caused by excessive pressure on the inlet side of the compressor.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of electrical control, and in particular, to a control method, device, electronic device, and storage medium for a compressor unit. Background Art

[0002] An air separation system is an industrial equipment system used to separate the component gases in air and produce oxygen, nitrogen, argon, and other gases of air components respectively. The air separation system includes a compression subsystem, a precooling subsystem, a purification subsystem, a heat exchange subsystem, a rectification subsystem, a product delivery subsystem, a liquid storage backup subsystem, etc.

[0003] In the compression subsystem, a centrifugal compressor is a commonly used device. The working principle of a centrifugal compressor is to increase the movement speed of gas molecules, so that the kinetic energy of the gas molecules is converted into the pressure energy of the gas, thereby increasing the pressure of the compressed air.

[0004] When a centrifugal compressor is running, if the suction flow rate decreases to a certain value, the compressor will exhibit an unstable working phenomenon. The outlet pressure of its suction flow rate will fluctuate rapidly and continuously, which is manifested as a rapid change in states such as high vibration and temperature rise, resulting in strong vibration of the compressor and accompanied by huge noise. This phenomenon is called the surge phenomenon of the compressor, which can lead to the failure or damage of the compressor.

[0005] In order to avoid the surge phenomenon of the compressor, anti-surge protection can be performed by opening the anti-surge valve. However, when the anti-surge valve is opened, the gas pressure near the compressor inlet increases, and when the gas pressure at the inlet is relatively large, it will instead trigger the compressor to trip.

[0006] Therefore, a more reliable control scheme for the compressor unit is needed. Summary of the Invention

[0007] In view of this, the embodiments of the present invention provide a control method, device, electronic device, and storage medium for a compressor unit to at least partially solve the above problems.

[0008] According to the first aspect of the embodiments of the present invention, a control method for a compressor unit is provided. The compressor unit includes a plurality of compressors connected in cascade. A blow-off valve is provided on the outlet side of one of the plurality of compressors. A surge valve is connected in a pipeline between the outlet side and the inlet side of the one compressor. The surge valve is configured to allow a part of the gas on the outlet side to be guided to the inlet side in an open state. The control method includes: determining whether the surge valve is in an open state in a next operating condition under the current operating condition of the one compressor; when it is determined that the surge valve will be placed in the open state in the next operating condition, controlling to open the blow-off valve; when it is determined that the blow-off valve is opened, controlling the one compressor to end the current operating condition and enter the next operating condition.

[0009] In another implementation manner of the present invention, determining whether the surge valve is in an open state in a next operating condition includes: when the next operating condition of the one compressor is a condition of unloading an oxygen pressure pump from the compressor unit, or when the compressor unit is in a condition of an air separation unit interlock state, or when at least two surge states occur within a predetermined time in the current operating condition, determining that the surge valve is in an open state in the next operating condition.

[0010] In another implementation manner of the present invention, determining that the surge valve is in an open state in a next operating condition includes: when receiving a status signal indicating unloading an oxygen pressure pump from the compressor unit, or when receiving a status signal indicating that the compressor unit is in an air separation unit interlock state, or when receiving at least two status signals indicating a surge state within a predetermined time in the current operating condition, determining that the surge valve is in an open state in the next operating condition.

[0011] In another implementation manner of the present invention, when it is determined that the surge valve will be placed in the open state in the next operating condition, controlling to open the blow-off valve includes: when it is determined that the surge valve will be placed in the open state in the next operating condition, setting the blow-off valve to have a predetermined opening value, and the predetermined opening value has an opening value range of 10%-15%.

[0012] In another implementation manner of the present invention, the control method further includes: when it is monitored that the opening value of the blow-off valve is within the opening value range, controlling the blow-off valve to switch from a fixed opening state with the predetermined opening value to a free opening state; based on the free opening state, controlling the blow-off valve.

[0013] In another implementation manner of the present invention, controlling the vent valve based on the free opening state includes: monitoring dynamic parameters of the vent valve in the free opening state; and performing proportional, derivative, and integral regulation on the vent valve based on the dynamic parameters.

[0014] In another implementation manner of the present invention, setting the vent valve to have a predetermined opening value includes: determining a predetermined opening value corresponding to the fixed opening state of the vent valve based on the size parameter of the vent valve and the capacity parameter of the one compressor; and controlling the vent valve to open with the predetermined opening value.

[0015] In another implementation manner of the present invention, before determining whether the surge prevention valve is in an open state in the next working condition, the method further includes: detecting the opening state of the vent valve, the opening state of the surge prevention valve, and the opening state of the inlet guide valve; and when it is detected that the opening state of the vent valve is fully closed, the opening state of the surge prevention valve is fully open, and the opening state of the inlet guide valve is at the minimum opening, controlling the one compressor to enter the current working condition.

[0016] According to a second aspect of an embodiment of the present invention, there is provided a control device for a compressor unit. The compressor unit includes a plurality of compressors connected in cascade. A vent valve is provided on the outlet side of one of the plurality of compressors. A surge prevention valve is connected in a pipeline between the outlet side and the inlet side of the one compressor. The surge prevention valve is configured to allow a part of the gas on the outlet side to be guided to the inlet side in an open state. The control device includes: a first control module configured to determine whether the surge prevention valve is in an open state in a next working condition under the current working condition of the one compressor; a second control module configured to control the vent valve to open when it is determined that the surge prevention valve will be placed in the open state in the next working condition; and a third control module configured to control the one compressor to end the current working condition and enter the next working condition when it is determined that the vent valve is opened.

[0017] According to a third aspect of an embodiment of the present invention, there is provided an electronic device, including: a processor, a memory, a communication interface, and a communication bus. The processor, the memory, and the communication interface complete mutual communication through the communication bus. The memory is used for storing at least one executable instruction, and the executable instruction causes the processor to perform operations corresponding to the method described in the first aspect.

[0018] According to a fourth aspect of an embodiment of the present invention, there is provided a computer storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the control method described in the first aspect.

[0019] In the solution of the embodiment of the present invention, when the anti-surge valve is in an open state in the next working condition, the controller opens the vent valve, reducing the pressure at the outlet of the compressor. Therefore, when the anti-surge valve arranged between the outlet side and the inlet side of the compressor is suddenly in an open state, the compressor trip caused by overpressure on the inlet side of the compressor is avoided. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a flowchart of the steps of a control method for a compressor unit according to an embodiment of the present invention.

[0022] Figure 2 is Figure 1 A schematic structural diagram of the compressor unit of the embodiment.

[0023] Figure 3 For Figure 1 A flowchart of the steps of a specific example of the control method of the embodiment.

[0024] Figure 4 It is a schematic structural block diagram of a control device for a compressor unit according to another embodiment of the present invention.

[0025] Figure 5 It is a schematic structural diagram of an electronic device according to another embodiment of the present invention.

[0026] List of reference numerals:

[0027] S110. Under the current working condition of the one compressor, determine whether the anti-surge valve is in an open state in the next working condition.

[0028] S120. When it is determined that the anti-surge valve will be placed in the open state in the next working condition, control to open the vent valve.

[0029] S130. When it is determined that the vent valve is opened, control the one compressor to end the current working condition and enter the next working condition.

[0030] 10. Compressor unit; 1. First-stage compressor; 2. First check valve; 3. First heat exchanger; 4. Second-stage compressor; 5. Second check valve; 6. Second heat exchanger; 7. Anti-surge valve; 8. Vent valve; 9. Vent valve;

[0031] S310: Detect the status signals of each valve and control the start of the compressor;

[0032] S320: Detect the rotational speed status of the compressor and control the status of the anti-surge valve and the inlet guide valve;

[0033] S330: Detect the status signals of the compressor and control the status of the blow-off valve;

[0034] S340: Control the blow-off valve to enter the fixed opening state;

[0035] S350: Control the anti-surge valve to open and guide a part of the gas on the outlet side to the inlet side;

[0036] S360: Control the blow-off valve based on the free opening state;

[0037] S370: Control to reduce the opening of the inlet guide valve;

[0038] S380: Detect the pressure status on the inlet side of the compressor and control the load of the compressor;

[0039] 410, First control module; 420, Second control module; 430, Third control module;

[0040] 502, Processor; 504, Communication interface; 506, Memory; 508, Communication bus; 510, Program. Detailed implementation manners

[0041] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the following will clearly and detailedly describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art shall fall within the scope protected by the embodiments of the present invention.

[0042] The following further illustrates the specific implementation of the embodiments of the present invention with reference to the accompanying drawings of the embodiments of the present invention.

[0043] Figure 1 It is a step flow chart of a control method for a compressor unit according to an embodiment of the present invention. In this embodiment, the compressor unit may be a centrifugal compressor unit included in an air separation system. The compressor unit includes a plurality of cascaded compressors. For example, a plurality of cascaded centrifugal compressors, and a blow-off valve is provided on the outlet side of the compressor. For example, a connecting pipeline is provided between the outlet side of each stage of the compressor and the inlet side of the next-stage compressor, and a blow-off valve is provided in the connecting pipeline.

[0044] A surge valve is provided between the outlet side and the inlet side of the compressor, and the surge valve is configured to guide a part of the gas on the outlet side to the inlet side in the open state.

[0045] The control method of this embodiment includes:

[0046] S110: Under the current operating condition of a compressor, determine whether the surge valve is in the open state in the next operating condition.

[0047] It should be understood that the compressor is in the compression subsystem of the air separation system. In order to implement each process of the compression subsystem, relevant control parameters need to be determined before each operating condition. For example, it can be judged whether the surge valve is open or closed in the next operating condition when the current operating condition is in progress or has been completed and the next operating condition has not been started. If the gas flow rate on the outlet side of the compressor corresponding to the surge valve in the next operating condition is greater than the preset gas flow rate threshold, and the gas pressure on the outlet side of the compressor is less than the preset gas pressure threshold, the surge valve remains closed. If the gas flow rate on the outlet side of the compressor corresponding to the surge valve in the next operating condition is less than the preset gas flow rate threshold, or the gas pressure on the outlet side of the compressor is greater than the preset gas pressure threshold, the surge valve (for example, controlled by a control device) quickly opens.

[0048] S120: When it is determined that the surge valve will be placed in the open state in the next operating condition, control to open the vent valve.

[0049] It should be understood that in the case of a failure in the subsequent section of the compressor, the surge valve is in the open state in the next operating condition. When a failure occurs in the subsequent section, the gas of the compressor accumulates on the outlet side, causing the pressure on the outlet side of the compressor to increase.

[0050] It should also be understood that the vent valve is connected to the corresponding compressor, and the air pressure in the compressor and its surrounding pipelines can be adjusted by controlling the open / closed state of the vent valve. When the vent valve is not in the closed state, the transient air pressure change caused when the outlet side and the inlet side of the compressor are connected (for example, when the surge valve is opened) is alleviated. When the vent valve is set to a pre-opening degree between the fully open degree and the zero opening degree, both the air pressure and the air flow in the compressor can be ensured, and the transient air pressure change caused when the outlet side and the inlet side of the compressor are connected can also be alleviated.

[0051] S130: When it is determined that the vent valve is opened, control a compressor to end the current operating condition and enter the next operating condition.

[0052] It should be understood that the open state of the vent valve can be an open state based on full opening, or an open state based on a pre-opening degree between full opening and zero opening. When the vent valve is controlled by the control device, the real-time opening degree of the vent valve is monitored. When the real-time opening degree meets the set pre-opening degree, the compressor is controlled to enter the next working condition. For example, it enters the working condition of unloading the oxygen pressure pump from the subsequent section of the compressor unit or the working condition where the compressor unit is in the interlock state of the air separation unit. Then, after the compressor unit completes all working conditions, the vent valve is opened at full opening.

[0053] It should be understood that the discharge pressure of the compressor is maintained at the set pressure by controlling the opening degree of the inlet guide vane (IGV) provided in the compressor. And in order to avoid the occurrence of surging, the anti-surge valve (ASV) connected to the outlet of the compressor is quickly opened in the surge control area or during load cut-off, etc., so that a part or all of the gas discharged from the compressor returns to the inlet side of the compressor.

[0054] More specifically, it will be combined with Figure 2 Describe Figure 1 The schematic structure of the compressor unit in the embodiment. Figure 2 The arrows shown indicate the gas flow direction (from the upstream to the downstream of the pipeline). The air separation unit compressor unit 10 (an example of the compressor unit) includes a first-stage compressor 1, a second-stage compressor 4, and upstream and downstream stages of compressors. In the air separation system, it also includes the previous section and the subsequent section of the air separation unit compressor unit 10. The compressor in the text can be any one of the first-stage compressor 1, the second-stage compressor 4, and the upstream and downstream stages of compressors. In other words, the control mechanism of the first-stage compressor 1 is also applicable to the control mechanism of the second-stage compressor 4. The first-stage compressor 1 corresponds to the anti-surge valve 7, the vent valve 8, and the first check valve 2. The second-stage compressor 4 corresponds to the anti-surge valve 7, the vent valve 9, and the second check valve 5. A first heat exchanger 3 is connected between the first-stage compressor 1 and the second-stage compressor 4 via a connecting pipeline, and a second heat exchanger 4 is connected to the downstream pipeline of the second-stage compressor 4. The anti-surge valve 7, the vent valve 8, the first check valve 2, the vent valve 9, and the second check valve 5 can all be connected to the control device 20 and can be controlled by the control device 20 as solenoid valves. Each solenoid valve can include an open state and a closed state, where the open state can include various opening degree states including full opening, and the control device 20 can control the above-mentioned open states and closed states. The vent valve 8 can be set as a solenoid valve with adjustable opening degree.

[0055] Further, the control device 20 can monitor the pressure states in each connecting pipeline. For example, sensors (not shown) are provided at the inlets or outlets of each connecting pipeline, and each sensor detects the gas pressure and reports it to the control device 20.

[0056] Specifically and exemplarily, the first-stage compressor 1 sucks in gas from the upstream pipeline, compresses the gas to generate compression heat, and the high-temperature compressed air enters the first heat exchanger 3 through the first check valve 2 for heat exchange. After the heat exchange is completed, the low-temperature compressed air enters the second-stage compressor 4 and continues to be compressed. After being compressed by the second-stage compressor 4, the low-temperature compressed air can enter the second heat exchanger 6 through the second check valve 5 for heat exchange.

[0057] Further, after the heat exchange is completed, the low-temperature compressed air can enter the next-stage compressor (not shown) in the booster system. In addition, a surge prevention return branch pipe is provided in front of the second check valve 5 near the outlet of the second-stage compressor 4, which returns from point B to point A near the first check valve 2. A surge prevention valve 7 is provided in the surge prevention return branch pipe. When the compressor unit 10 operates into the surge prevention control area, the surge prevention valve 7 opens to perform surge prevention control on the second-stage compressor 4. For the first-stage compressor 1, when the surge prevention valve 7 opens, it performs surge prevention control on the first-stage compressor 1.

[0058] When the air separation device fails or any compressor in the compressor unit 10 fails, the surge prevention valve 7 quickly opens, and the compressor unit 10 reduces the outlet pressure of the first-stage compressor 1 or the second-stage compressor 4 through reflux to avoid compressor surge. In addition, the vent valve 9 can also be opened to quickly relieve pressure to reduce the sudden increase in the flow rate at point B caused by suddenly opening the surge valve, resulting in a sudden increase in pressure.

[0059] In addition, the vent valve 8 is opened simultaneously to exhaust to the atmosphere, reducing the pressure on the outlet side of the first-stage compressor 1. At the same time, as the outlet pressures and flow rates of the first-stage compressor 1 and the second-stage compressor 4 both drop to the safe range due to the sudden reflux of the second-stage compressor, the inlet guide vanes of the first-stage and second-stage compressors can be closed to the minimum position simultaneously, and the compressor can operate safely and smoothly.

[0060] In the solution of the embodiment of the present invention, when the surge prevention valve is in the open state in the next working condition, the controller opens the vent valve, reducing the pressure at the outlet of the compressor. Therefore, when the surge prevention valve provided between the outlet side and the inlet side of the compressor is suddenly in the open state, it avoids the compressor trip caused by overpressure on the inlet side of the compressor.

[0061] In other words, when the oxygen pressure pump is unloaded from the air separation system, or after the air separation unit is interlocked, the pressure at the outlet of the booster suddenly rises, and the compressor enters the surge zone. The control system will automatically and quickly open the surge valve for reflux to guide part of the gas on the outlet side of the booster compressor to the inlet side of the booster compressor to reduce the outlet pressure and supplement the inlet flow rate. However, the rapid opening of the surge valve easily causes overpressure at the compressor inlet, resulting in a fault trip. During this process, the control system will adjust the opening of the vent valve according to the inlet pressure of the compressor and ensure that the compressor operates in the normal working area.

[0062] In order to determine the open / close state of the anti-surge valve in the next working condition of the compressor, in one example, when the next working condition of the compressor is the condition of unloading the oxygen pressure pump from the compressor unit, or when the compressor unit is in the interlocked state of the air separation unit, or when at least two surge states occur within a predetermined time in the current working condition, it is determined that the anti-surge valve is in the open state in the next working condition, thereby reliably determining the open / close state in the next working condition and enabling the anti-surge valve to be in the open state in the next working condition.

[0063] In order to achieve the determination that the anti-surge valve is in the open state in the next working condition of the compressor when the next working condition of the compressor is the condition of unloading the oxygen pressure pump from the subsequent section of the compressor unit, or when the compressor unit is in the interlocked state of the air separation unit, or when at least two surge states occur within a predetermined time in the current working condition. For example, it is in the state of rapid opening. In one example, when receiving a status signal indicating the unloading of the oxygen pressure pump from the subsequent section of the compressor unit, or when receiving a status signal indicating that the compressor unit is in the interlocked state of the air separation unit, or when receiving at least two status signals indicating the surge state within a predetermined time in the current working condition, it is determined that the anti-surge valve is in the open state in the next working condition. The electrical signals reliably and accurately reflect the dynamic parameters in each working condition of the compressor. Based on these status signals, the various working conditions of the compressor can be accurately judged.

[0064] Furthermore, in order to control the opening of the vent valve when the anti-surge valve is in the open state in the next working condition, in one example, when the anti-surge valve is in the open state in the next working condition, the vent valve is controlled to enter a fixed opening state. It should be understood that the fixed opening state can be a pre-opening degree for the anti-surge valve. For example, the opening value range is 10%-15%. The pressure in the connecting pipeline is relieved. When the anti-surge valve is opened, the pressure on the inlet side of the compressor is within the safe pressure range. It should be understood that the pre-opening degree can be determined based on the estimated pressure range on the inlet side of the compressor after the anti-surge valve is opened, so that the estimated pressure range is within the safe pressure range.

[0065] To improve the reliability control of the compressor, when the current opening value of the vent valve is monitored to be within the opening value range in this embodiment, the control method controls the vent valve to switch from the fixed opening state to the free opening state, and based on the free opening state, controls the vent valve, so as to further control the corresponding valve based on the pressure state in the connecting pipeline. For example, in response to the open state of the vent valve, the vent valve can be immediately controlled to switch from the fixed opening state to the free opening state, or when the opening value of the vent valve is monitored to be within the opening value range, the real-time pressure on the inlet side of the compressor can be monitored, and then the vent valve is controlled to switch from the fixed opening state to the free opening state.

[0066] To control the vent valve based on the free opening state, in one example, the dynamic parameters of the vent valve in the free opening state can be monitored, and based on the dynamic parameters, proportional, derivative, and integral adjustments are made to the vent valve. The dynamic parameters indicate the movement parameters related to the opening value when the vent valve moves with the air flow in the free opening state. PID parameter adjustment can be performed on the vent valve, so as to reliably and effectively achieve feedback control. Compared with closing the vent valve, the reliable pressure state in the connecting pipeline avoids the compressor from tripping.

[0067] To control the vent valve to enter the fixed opening state when it is in the open state in the next working condition, in one example, based on the size parameter of the vent valve and the capacity parameter of the compressor, the opening corresponding to the fixed opening state of the vent valve is determined, and the vent valve is controlled to open with this opening. Compressors with different capacity parameters can have vent valves of different sizes. For example, a compressor with a larger capacity is equipped with a larger-sized vent valve, and a compressor with a smaller capacity is equipped with a smaller-sized vent valve. Vent valves of different sizes have different sensitivities to the pressure state in the connecting pipeline during opening adjustment or switching between on-off states, further improving the accuracy of pressure regulation control in the compressor.

[0068] To control the compressor more reliably, before judging the on-off state of the anti-surge valve in the next working condition of the compressor, the control method of this embodiment can also detect the opening state of the vent valve, the opening state of the anti-surge valve, and the opening state of the inlet guide valve. Accordingly, when it is detected that the opening state of the vent valve is fully closed, the opening state of the anti-surge valve is fully open, and the opening state of the inlet guide valve is at the minimum opening, control the one compressor to enter the current working condition. Specifically, the control device detects the state signals of each valve, including the state signal of the vent valve, the state signal of the anti-surge valve, the state signal of the inlet guide valve, etc. If the state signal of the vent valve indicates that the vent valve is fully closed, the state signal of the anti-surge valve indicates that the anti-surge valve is fully open, and the state signal of the inlet guide valve indicates that the inlet guide valve is at the minimum opening, the control device controls the compressor to start.

[0069] Figure 3 For Figure 1 The step flow chart of a specific example of the control method of the embodiment. Figure 3 The control method includes the following steps:

[0070] S310: Detect the status signals of each valve and control the compressor to start. Specifically, the control device detecting the status signals of each valve includes the status signal of the blow-off valve, the status signal of the anti-surge valve, the status signal of the inlet guide valve, etc. If the status signal of the blow-off valve indicates that the blow-off valve is fully closed, the status signal of the anti-surge valve indicates that the anti-surge valve is fully open, and the status signal of the inlet guide valve indicates that the inlet guide valve is at the minimum opening, then the control device controls the compressor to start.

[0071] S320: Detect the speed status of the compressor and control the status of the anti-surge valve and the inlet guide valve. Specifically, when the speed of the compressor reaches the rated speed, the control system automatically controls the anti-surge valve and the inlet guide valve to enter the automatic adjustment state.

[0072] S330: Detect the status signal of the compressor and control the status of the blow-off valve. Specifically, when receiving the status signal indicating unloading the oxygen pressure pump from the compressor unit, or when receiving the status signal indicating that the compressor unit is in the interlock state of the air separation unit, or when receiving at least two status signals indicating the surge state within the predetermined time in the current working condition, it is determined that the anti-surge valve is in the open state in the next working condition.

[0073] S340: Control the blow-off valve to enter the fixed opening state. Specifically, the blow-off valve can be controlled to open based on the opening value range of 10% - 15%.

[0074] S350: Control the anti-surge valve to open and guide part of the gas on the outlet side to the inlet side.

[0075] S360: Control the blow-off valve based on the free opening state. Specifically, the blow-off valve enters the automatic following pressure regulation state, that is, activates the PID regulation of the blow-off valve.

[0076] S370: Control to reduce the opening of the inlet guide valve. Close the inlet guide valve to the minimum position to make the compressor in the minimum working load.

[0077] S380: Detect the pressure status on the inlet side of the compressor and control the load of the compressor. Specifically, monitor the pressure at the inlet and between stages of the compressor to make the compressor operate smoothly at the minimum load state.

[0078] Figure 4Schematic structural block diagram of a control device for a compressor unit according to another embodiment of the present invention. In this embodiment, the compressor unit includes a plurality of cascaded compressors. A vent valve is provided on the outlet side of the compressor, a vent valve is provided in the connecting pipeline, and an anti-surge valve is provided between the outlet side and the inlet side of the compressor. The anti-surge valve is configured to guide a part of the gas on the outlet side to the inlet side in the open state.

[0079] The control device includes:

[0080] A first control module 410, which determines whether the anti-surge valve is in an open state in the next operating condition under the current operating condition of the one compressor.

[0081] A second control module 420, which controls the opening of the vent valve when it is determined that the anti-surge valve will be placed in the open state in the next operating condition.

[0082] A third control module 430, which controls the one compressor to end the current operating condition and enter the next operating condition when it is determined that the vent valve is opened.

[0083] In the solution of the embodiment of the present invention, when the anti-surge valve is in an open state in the next operating condition, the opening of the vent valve is controlled, reducing the pressure in the pipeline where the vent valve is located. Therefore, when the anti-surge valve provided between the outlet side and the inlet side of the compressor is in an open state, the compressor trip caused by excessive pressure on the inlet side of the compressor is avoided.

[0084] In some other examples, the first control module is specifically configured to: determine that the anti-surge valve is in an open state in the next operating condition when the next operating condition of the one compressor is a condition of unloading the oxygen pressure pump from the compressor unit, or when the compressor unit is in a condition of being in an interlock state of the air separation unit, or when at least two surge states occur within a predetermined time in the current operating condition.

[0085] In some other examples, the first control module is specifically configured to: determine that the anti-surge valve is in an open state in the next operating condition when receiving a status signal indicating unloading the oxygen pressure pump from the compressor unit, or when receiving a status signal indicating that the compressor unit is in an interlock state of the air separation unit, or when receiving at least two status signals indicating surge states within a predetermined time in the current operating condition.

[0086] In some other examples, the second control module is specifically configured to: set the vent valve to have a predetermined opening value when it is determined that the anti-surge valve will be placed in the open state in the next operating condition.

[0087] In some other examples, the control device further includes: a fourth control module, which, when detecting that the opening degree value of the blow-off valve is within the range of the opening degree values, controls the blow-off valve to switch from a fixed opening state with the predetermined opening degree value to a free opening state; and based on the free opening state, controls the blow-off valve.

[0088] In some other examples, the fourth control module is specifically configured to: monitor the dynamic parameters of the blow-off valve in the free opening state, and based on the dynamic parameters, perform proportional, derivative, and integral regulation on the blow-off valve.

[0089] In some other examples, the second control module is specifically configured to: determine the predetermined opening degree value corresponding to the fixed opening state of the blow-off valve based on the size parameter of the blow-off valve and the capacity parameter of the one compressor; and control the blow-off valve to open with the predetermined opening degree value.

[0090] In some other examples, the control device further includes: a fifth control module, which detects the opening state of the blow-off valve, the opening state of the anti-surge valve, and the opening state of the inlet guide valve; when detecting that the opening state of the blow-off valve is fully closed, the opening state of the anti-surge valve is fully open, and the opening state of the inlet guide valve is at the minimum opening degree, controls the one compressor to enter the current working condition.

[0091] The device of this embodiment is used to implement the corresponding methods in the foregoing multiple method embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be elaborated here. In addition, the function implementation of each module in the device of this embodiment can refer to the description of the corresponding part in the foregoing method embodiments, which will not be elaborated here either. Refer to Figure 5 , which shows a schematic structural diagram of an electronic device according to another embodiment of the present invention. The specific implementation of the electronic device in the specific embodiments of the present invention is not limited.

[0092] As Figure 5 shown, the electronic device may include: a processor 502, a communication interface 504, a memory 506 storing a program 510, and a communication bus 508.

[0093] The processor, the communication interface, and the memory communicate with each other through the communication bus.

[0094] The communication interface is used to communicate with other electronic devices or servers.

[0095] The processor is used to execute the program, and specifically can execute the relevant steps in the foregoing method embodiments.

[0096] Specifically, the program may include program code, which includes computer operation instructions.

[0097] The processor may be a CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention. One or more processors included in the intelligent device may be of the same type of processor, such as one or more CPUs; or may be of different types of processors, such as one or more CPUs and one or more ASICs.

[0098] The memory is used to store the program. The memory may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.

[0099] Specifically, the program can be used to cause the processor to perform the following operations: determine the on / off state of the anti-surge valve in the next operating condition of the compressor; when the anti-surge valve is in the open state in the next operating condition, control to open the blowdown valve; in response to the opening of the blowdown valve, control the compressor to enter the next operating condition.

[0100] In addition, for the specific implementation of each step in the program, reference can be made to the corresponding steps and the corresponding descriptions in the units in the above method embodiments, which will not be elaborated here. Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the above-described devices and modules can refer to the corresponding process descriptions in the foregoing method embodiments, which will not be elaborated here.

[0101] It should be noted that according to the needs of implementation, the various components / steps described in the embodiments of the present invention can be split into more components / steps, or two or more components / steps or partial operations of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of the present invention.

[0102] The method according to the embodiments of the present invention can be implemented in hardware, firmware, or be implemented as software or computer code that can be stored in a recording medium (such as a CD ROM, RAM, floppy disk, hard disk, or magneto-optical disk), or be implemented as computer code that is originally stored in a remote recording medium or a non-transitory machine-readable medium and downloaded through a network and will be stored in a local recording medium, so that the method described herein can be stored in such software processing on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an ASIC or FPGA). It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component (such as RAM, ROM, flash memory, etc.) that can store or receive software or computer code, and when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method described herein is implemented. In addition, when a general-purpose computer accesses the code for implementing the method shown herein, the execution of the code converts the general-purpose computer into a dedicated computer for executing the method shown herein.

[0103] Those of ordinary skill in the art can realize that the units and method steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such an implementation should not be considered to exceed the scope of the embodiments of the present invention.

[0104] The above embodiments are only used to illustrate the embodiments of the present invention, rather than to limit the embodiments of the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present invention. The patent protection scope of the embodiments of the present invention shall be defined by the claims.

Claims

1. A control method for a compressor unit, characterized in that, the compressor unit includes a plurality of compressors connected in cascade, a blow-off valve is provided on the outlet side of one of the plurality of compressors, and an anti-surge valve is connected in a pipeline between the outlet side and the inlet side of the one compressor, the anti-surge valve is configured to allow part of the gas on the outlet side to be guided to the inlet side in an open state, and the control method includes: determining whether the anti-surge valve is in an open state in the next operating condition under the current operating condition of the one compressor (S110); when it is determined that the anti-surge valve will be placed in the open state in the next operating condition, controlling to open the blow-off valve (S120); when it is determined that the blow-off valve is opened, controlling the one compressor to end the current operating condition and enter the next operating condition (S130), the determining whether the anti-surge valve is in an open state in the next operating condition includes: when the next operating condition of the one compressor is a condition of unloading an oxygen pressure pump from the compressor unit, or when the compressor unit is in a condition of an air separation unit interlock state, or when at least two surge states occur within a predetermined time in the current operating condition, determining that the anti-surge valve is in an open state in the next operating condition.

2. The control method according to claim 1, characterized in that, the determining whether the anti-surge valve is in an open state in the next operating condition includes: when receiving a status signal indicating unloading of an oxygen pressure pump from the compressor unit, or when receiving a status signal indicating that the compressor unit is in an air separation unit interlock state, or when receiving at least two status signals indicating surge states within a predetermined time in the current operating condition, determining that the anti-surge valve is in an open state in the next operating condition.

3. The control method according to claim 1, characterized in that, the controlling to open the blow-off valve when it is determined that the anti-surge valve will be placed in the open state in the next operating condition includes: when it is determined that the anti-surge valve will be placed in the open state in the next operating condition, setting the blow-off valve to have a predetermined opening value, and the predetermined opening value has an opening value range of 10%-15%.

4. The control method according to claim 3, characterized in that, the method further includes: monitoring the opening value of the blow-off valve; when the opening value of the blow-off valve within the opening value range is monitored, controlling the blow-off valve to switch from a fixed opening state with the predetermined opening value to a free opening state; controlling the blow-off valve based on the free opening state.

5. The control method according to claim 4, characterized in that, controlling the blow-off valve based on the free opening state includes: monitoring the dynamic parameters of the blow-off valve in the free opening state; performing proportional, derivative and integral regulation on the blow-off valve based on the dynamic parameters.

6. The control method according to claim 3, characterized in that, the setting the blow-off valve to have a predetermined opening value includes: Determine a predetermined opening value corresponding to the fixed opening state of the blow-off valve based on the size parameter of the blow-off valve and the capacity parameter of the one compressor; Control the blow-off valve to open at the predetermined opening value.

7. The control method according to claim 1, wherein, before determining whether the anti-surge valve is in an open state in the next operating condition, the method further includes: detecting the opening state of the blow-off valve, the opening state of the anti-surge valve, and the opening state of the inlet guide valve; when it is detected that the opening state of the blow-off valve is fully closed, the opening state of the anti-surge valve is fully open, and the opening state of the inlet guide valve is at the minimum opening, control the one compressor to enter the current operating condition.

8. A control device for a compressor unit, wherein, the compressor unit includes a plurality of compressors connected in cascade, a blow-off valve is provided on the outlet side of one of the plurality of compressors, and an anti-surge valve is connected in a pipeline between the outlet side and the inlet side of the one compressor, and the anti-surge valve is configured to allow a part of the gas on the outlet side to be guided to the inlet side in an open state, the control device includes: a first control module (410) that determines whether the anti-surge valve is in an open state in the next operating condition under the current operating condition of the one compressor; a second control module (420) that controls the blow-off valve to open when it is determined that the anti-surge valve will be placed in the open state in the next operating condition; a third control module (430) that controls the one compressor to end the current operating condition and enter the next operating condition when it is determined that the blow-off valve is opened, the first control module (410) is configured to determine that the anti-surge valve is in an open state in the next operating condition when the next operating condition of the one compressor is a condition of unloading an oxygen pressure pump from the compressor unit, or when the compressor unit is in a condition of an air separation unit interlock state, or when at least two surge states occur within a predetermined time in the current operating condition.

9. An electronic device, wherein, it includes: a processor, a memory, a communication interface, and a communication bus, and the processor, the memory, and the communication interface complete mutual communication through the communication bus; the memory is used to store at least one executable instruction, and the executable instruction causes the processor to execute the operations corresponding to the method according to any one of claims 1-7.

10. A computer storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the control method according to any one of claims 1-7.

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