Compressor anti-surge control method, device, equipment and system

Abstract

The embodiment of the present application discloses a compressor anti-surge control method, device, equipment and system, which belongs to the field of oil and gas storage and transportation technology. The method is applied to the control device, and the method includes: obtaining the power supply voltage corresponding to the drive motor, and the drive motor is used to drive the compressor to rotate under the action of the power supply voltage; in response to the power supply voltage being lower than the preset voltage threshold, the pneumatic valve is controlled to open, and when the pneumatic valve is open, the high-pressure gas at the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline; in response to the power supply voltage being higher than the preset voltage threshold, the pneumatic valve is controlled to close. When the control device detects that the power supply voltage of the motor fluctuates, by controlling the pneumatic valve to open, the pressure and flow of the compressor inlet and outlet can be quickly balanced, the compressor speed can be avoided from dropping extremely fast, the compressor inlet flow can be supplemented in time, and the compressor can be prevented from shutting down due to surge caused by the temporary drop in the power supply voltage, thereby ensuring the safe and stable operation of the compressor unit.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of oil and gas storage and transportation, and in particular to a compressor anti-surge control method, device, equipment and system. Background Art

[0002] A compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. During the oil and gas transportation process, the compressor is used to compress the low-pressure gas flowing into the compressor inlet pipeline into high-pressure gas and discharge it through the compressor outlet pipeline, playing a very important role in the oil and gas transportation process.

[0003] In the related technology, during the actual operation of the compressor unit, if the power supply voltage of the compressor unit drops temporarily, the motor used to drive the compressor will lose power instantly. Under the load of the compressor unit, the speed of the compressor unit will drop rapidly, and the peripheral power supply will soon return to normal after a short fluctuation. During this period, due to the long pipeline of the unit's anti-surge system, the inlet flow of the compressor unit cannot be replenished in time, causing the compressor unit to shut down due to surge due to low flow. Summary of the invention

[0004] The embodiment of the present application provides a compressor anti-surge control method, device, equipment and system. It can prevent the compressor from surging due to temporary power supply voltage. The technical solution is as follows:

[0005] On the one hand, an embodiment of the present application provides a compressor anti-surge control method, the method is applied to a control device, the method comprising:

[0006] Obtaining a power supply voltage corresponding to a drive motor, wherein the drive motor is used to drive the compressor to rotate under the action of the power supply voltage;

[0007] In response to the power supply voltage being lower than a preset voltage threshold, the pneumatic valve is controlled to open, and when the pneumatic valve is in the open state, the high-pressure gas at the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline;

[0008] In response to the supply voltage being higher than the preset voltage threshold, the pneumatic valve is controlled to be closed.

[0009] In an optional embodiment, a throttling orifice plate is arranged behind the pneumatic valve, and the aperture of the throttling orifice plate is adjustable;

[0010] After the pneumatic valve is controlled to open in response to the supply voltage being lower than a preset voltage threshold, the method further comprises:

[0011] Acquiring a current gas flow rate in the auxiliary anti-surge pipeline;

[0012] The aperture of the throttling orifice is adjusted according to the current gas flow rate, and the throttling orifice is used to adjust the gas flow rate in the anti-surge pipeline.

[0013] In an optional embodiment, adjusting the aperture of the throttling orifice plate according to the current gas flow rate includes:

[0014] In response to the current gas flow rate being greater than a first preset flow rate threshold, controlling to reduce the aperture of the throttling orifice plate, thereby reducing the gas flow rate in the auxiliary anti-surge pipeline by reducing the aperture of the throttling orifice plate;

[0015] In response to the current gas flow rate being less than a second preset flow rate threshold, the aperture of the throttling orifice is controlled to increase, and the gas flow rate in the auxiliary anti-surge pipeline is increased by increasing the aperture of the throttling orifice, wherein the second preset flow rate threshold is less than the first preset flow rate threshold.

[0016] In an optional embodiment, in response to the supply voltage being higher than the preset voltage threshold, controlling the pneumatic valve to close includes:

[0017] In response to the supply voltage being higher than the preset voltage threshold, and the time duration for which the supply voltage recovers to be higher than the preset voltage threshold reaching a preset time duration threshold, the pneumatic valve is controlled to be closed.

[0018] In an optional embodiment, the controlling the pneumatic valve to open comprises:

[0019] Sending an opening instruction to the pneumatic valve, wherein the pneumatic valve is used to open the valve upon receiving the opening instruction;

[0020] The controlling the pneumatic valve to close comprises:

[0021] A closing instruction is sent to the pneumatic valve, and the pneumatic valve is used to close the valve when receiving the closing instruction.

[0022] On the other hand, an embodiment of the present application provides a compressor anti-surge control device, which is applied to a control device, and includes:

[0023] A first acquisition module is used to acquire a power supply voltage corresponding to a drive motor, wherein the drive motor is used to drive the compressor to rotate under the action of the power supply voltage;

[0024] a first control module, configured to control the pneumatic valve to open in response to the power supply voltage being lower than a preset voltage threshold, wherein when the pneumatic valve is opened, the high-pressure gas at the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline;

[0025] The second control module is used for controlling the pneumatic valve to close in response to the supply voltage being higher than the preset voltage threshold.

[0026] On the other hand, an embodiment of the present application provides a control device, which includes a processor and a memory, wherein the memory stores at least one instruction, and the at least one instruction is executed by the processor to implement the compressor anti-surge control method as described in the above aspect.

[0027] On the other hand, an embodiment of the present application provides a compressor anti-surge control system, the compressor anti-surge control system comprising a compressor, a motor, a compressor inlet pipeline, a compressor outlet pipeline, a unit anti-surge pipeline, an auxiliary anti-surge pipeline, a pneumatic valve and a control device;

[0028] The motor is electrically connected to the compressor and is used to drive the compressor to rotate;

[0029] The compressor is used to compress the low-pressure gas flowing into the compressor inlet pipeline to obtain high-pressure gas, and discharge it through the compressor outlet pipeline;

[0030] The unit anti-surge pipeline is used to connect the compressor inlet pipeline and the compressor outlet pipeline, and the unit anti-surge pipeline is used to provide a flow channel for the high-pressure gas to flow back from the compressor outlet pipeline to the compressor inlet pipeline in a flow state;

[0031] The auxiliary anti-surge pipeline connects the compressor inlet pipeline and the compressor outlet pipeline, and the auxiliary anti-surge pipeline is used to provide a flow channel for the high-pressure gas to flow back from the compressor outlet pipeline to the compressor inlet pipeline in a flow state, wherein the length of the auxiliary anti-surge pipeline is less than the length of the unit anti-surge pipeline;

[0032] The pneumatic valve is arranged on the auxiliary anti-surge pipeline and is used to control the on-off state of the auxiliary anti-surge pipeline;

[0033] The control device is electrically connected to the pneumatic valve, and is used to control the pneumatic valve to open when it detects that the power supply voltage of the motor drops, and to control the pneumatic valve to close when it detects that the power supply voltage of the motor recovers.

[0034] In an optional embodiment, the anti-surge system further includes a throttling orifice plate;

[0035] The throttling orifice is connected to the pneumatic valve, and the throttling orifice is used to adjust the gas flow rate in the auxiliary anti-surge pipeline.

[0036] In an optional embodiment, the pneumatic valve has a preset flow coefficient, the preset flow coefficient is between 100 and 300, and the length of the auxiliary anti-surge pipeline is less than or equal to 30m.

[0037] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0038] In the embodiment of the present application, an auxiliary anti-surge pipeline and a pneumatic valve are added to the original compressor unit control system. When the control device detects that the power supply voltage of the motor fluctuates, the pneumatic valve is controlled to open so that the gas at the compressor outlet pipeline can flow back to the compressor inlet pipeline through the auxiliary anti-surge pipeline, thereby quickly balancing the pressure and flow of the compressor inlet and outlet, avoiding a rapid drop in the compressor speed, and replenishing the compressor inlet flow in time, thereby avoiding compressor surge shutdown due to a temporary drop in the power supply voltage, thereby ensuring safe and stable operation of the compressor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A compressor unit anti-surge control system according to an exemplary embodiment of the present application is shown;

[0040] Figure 2 A flowchart of a compressor anti-surge control method according to an exemplary embodiment of the present application is shown;

[0041] Figure 3 A flowchart of a compressor anti-surge control method according to another exemplary embodiment of the present application is shown;

[0042] Figure 4 A structural block diagram of a compressor unit anti-surge control device provided by an exemplary embodiment of the present application is shown;

[0043] Figure 5 A schematic diagram of the structure of a computer device provided by an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0045] The term "multiple" as used herein refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0046] In the related technology, a special anti-surge system is designed between the inlet pipeline and the outlet pipeline of the long-distance natural gas pipeline compressor unit, including an anti-surge system pipeline and an anti-surge valve, wherein the length of the anti-surge system pipeline is about 200 meters; in the actual operation process, due to the temporary drop in the power supply voltage of the unit, the motor will usually lose power within 400ms-700ms, and under the load of the compressor unit, the speed of the compressor unit will drop rapidly; soon, the external power will resume normal supply after a brief fluctuation, and the motor will resume and restart, and the corresponding compressor unit speed will accelerate to drop, and then quickly resume to increase speed. During this period, the anti-surge valve can be opened so that the high-pressure gas in the compressor outlet pipeline can flow back to the compressor inlet pipeline through the anti-surge system pipeline, so as to achieve the purpose of balancing the inlet and outlet flow of the compressor unit and preventing the system from surging.

[0047] Obviously, in the related art, since the anti-surge system pipeline is too long and cannot respond quickly, the inlet flow of the compressor unit cannot be replenished in time, causing the compressor unit to shut down due to surge caused by too low inlet flow.

[0048] In view of the problems in the related art, the present application provides a new compressor unit anti-surge control system, such as Figure 1 As shown, it shows a compressor unit anti-surge control system shown in an exemplary embodiment of the present application, and the compressor unit anti-surge control system includes a compressor 101, a motor 102, a compressor inlet pipeline 103, a compressor outlet pipeline 104, a unit anti-surge pipeline 105, an auxiliary anti-surge pipeline 106, a pneumatic valve 107 and a control device (not shown in the figure).

[0049] The motor 102 is electrically connected to the compressor 101 and is used to drive the compressor 101 to rotate; the compressor 101 is used to compress the low-pressure gas flowing into the compressor inlet pipeline 103 to obtain high-pressure gas, and discharge it through the compressor outlet pipeline 104; the unit anti-surge pipeline 105 is used to connect the compressor inlet pipeline 103 and the compressor outlet pipeline 104, and the unit anti-surge pipeline 105 is used to provide a flow channel for the high-pressure gas to flow back from the compressor outlet pipeline 104 to the compressor inlet pipeline 103 under the circulation state; the auxiliary anti-surge pipeline 106 connects the compressor inlet pipeline 103 and the compressor outlet pipeline 1 04, the auxiliary anti-surge pipeline 106 is used to provide a flow channel for the high-pressure gas to flow back from the compressor outlet pipeline 104 to the compressor inlet pipeline 103 under the flow state, wherein the length of the auxiliary anti-surge pipeline 106 is less than the length of the unit anti-surge pipeline 105; the pneumatic valve 107 is arranged on the auxiliary anti-surge pipeline 106, and is used to control the on-off state of the auxiliary anti-surge pipeline 106; the control device is electrically connected to the pneumatic valve 107, and the control device is used to control the pneumatic valve 107 to open when it is detected that the power supply voltage of the motor 102 drops, and control the pneumatic valve 107 to close when it is detected that the power supply voltage of the motor 102 is restored.

[0050] Depend on Figure 1 It can be seen that compared with the compressor anti-surge control system in the related art, the compressor anti-surge control system provided in the embodiment of the present application adds an auxiliary anti-surge pipeline in the compressor inlet pipeline and the compressor outlet pipeline, directly connects the compressor outlet with the inlet, and installs a pneumatic valve that can respond quickly on the auxiliary anti-surge pipeline. The working principle of adding the auxiliary anti-surge pipeline and the pneumatic valve to avoid surge is:

[0051] When the compressor unit is operating normally, the newly added pneumatic valve is in a closed state; when the power supply voltage of the motor fluctuates instantaneously, the control device of the compressor unit detects a temporary drop in the power supply voltage and immediately sends an opening command to the pneumatic valve. The pneumatic valve opens quickly after receiving the opening command, so that the auxiliary anti-surge pipeline is in a flow state, that is, the gas in the compressor outlet pipeline can flow back to the compressor inlet pipeline through the auxiliary anti-surge pipeline, quickly balancing the inlet and outlet pressures of the compressor unit. Moreover, since the auxiliary anti-surge pipeline is very short, it can respond more quickly, so that the compressor inlet flow can be replenished in time, thereby avoiding the compressor unit from surging due to excessive compressor outlet pressure, resulting in gas backflow back to the compressor; when the control device of the compressor unit detects that the power supply voltage has returned to normal, the compressor unit power has been restored, and it can run normally at a higher speed. It can send a closing command to the pneumatic valve to control the pneumatic valve to close quickly. During the whole process, the compressor unit will not surge due to too low inlet flow of the unit.

[0052] Optionally, after the pneumatic valve corresponding to the auxiliary anti-surge pipeline is opened, the gas at the outlet of the compressor unit is not cooled during the process of flowing back to the inlet of the compressor unit through the auxiliary anti-surge pipeline, and the gas at the outlet of the compressor is a high-temperature and high-pressure gas. If it directly flows back to the inlet of the compressor unit, the mixing ratio of the high-temperature gas in the compressor inlet pipeline may be too large, resulting in the compressor inlet temperature rising too fast and the inlet gas expanding rapidly, so that the gas flow of the compressor unit not only does not increase but decreases, causing the compressor unit to surge. Therefore, in order to avoid the gas flow rate in the auxiliary anti-surge pipeline being too fast, resulting in the above situation, the flow coefficient corresponding to the pneumatic valve set on the auxiliary anti-surge pipeline cannot be too large. After simulation, when the flow coefficient of the pneumatic valve is between 100-300, it can ensure that the compressor inlet temperature meets the unit operation requirements. Correspondingly, the specific value of the pneumatic valve is also related to the size of the compressor inlet pipeline and the length of the auxiliary anti-surge pipeline.

[0053] Optionally, the compressor anti-surge control system in the embodiment of the present application also includes a throttling orifice 108, which is connected to the pneumatic valve 107. The throttling orifice 108 can be designed after the pneumatic valve 107. The throttling orifice 108 is used to adjust the gas flow rate in the auxiliary anti-surge pipeline; for example, if the on-site technician determines that the gas flow rate in the auxiliary anti-surge pipeline is too fast, a throttling orifice can be added after the pneumatic valve to reduce the gas flow rate in the auxiliary anti-surge pipeline.

[0054] Optionally, the throttling orifice plate can be adjusted according to the on-site conditions, for example, throttling orifice plates of different diameters can be replaced in different situations.

[0055] Optionally, in the embodiment of the present application, since the auxiliary anti-surge pipeline is used for rapid response, that is, it is necessary to achieve rapid balancing of the flow of the compressor inlet and outlet, the length of the auxiliary anti-surge pipeline cannot be too long. After simulation, it is determined that the length of the auxiliary anti-surge pipeline is less than 30m, which can achieve the purpose of rapid response. For example, the length of the auxiliary anti-surge pipeline can be set to 20m.

[0056] Optionally, in an embodiment of the present application, an auxiliary anti-surge pipeline is added on the basis of the original anti-surge pipeline of the unit to achieve the purpose of quickly balancing the inlet and outlet flow of the compressor unit. When the control device controls the pneumatic valve to open, it will also control the anti-surge valve corresponding to the anti-surge pipeline of the unit to open, so as to jointly balance the inlet and outlet flow of the compressor.

[0057] To sum up, in the embodiment of the present application, by adding an auxiliary anti-surge pipeline and a pneumatic valve, since the length of the newly added auxiliary anti-surge pipeline is shorter, it has the advantage of faster response compared to the original anti-surge pipeline of the unit. Therefore, when the power supply of the compressor unit fluctuates, the flow at the inlet and outlet of the compressor can be quickly balanced, thereby avoiding surge shutdown of the unit, so that after the power supply is restored, the compressor unit can gradually resume normal operation, ensuring the safe and stable operation of the compressor unit.

[0058] The above embodiments mainly introduce the compressor unit anti-surge system shown in the embodiments of the present application, and the following embodiments focus on how the control device controls to implement the above anti-surge control method, such as Figure 2 As shown, it shows a flowchart of a compressor anti-surge control method shown in an exemplary embodiment of the present application. The present application embodiment is applied to the method Figure 1 Taking the control device in the anti-surge control system of the compressor as an example, the method includes:

[0059] Step 201, obtaining a power supply voltage corresponding to a driving motor, where the driving motor is used to drive the compressor to rotate under the action of the power supply voltage.

[0060] Among them, the driving motor is a device that drives the compressor to rotate. When the driving motor loses power, the speed of the compressor also drops rapidly under the action of load.

[0061] In one possible implementation, the control device can detect in real time the power status of the power supply that provides electrical energy to the drive motor. That is, the control device will obtain the power supply voltage corresponding to the drive motor in real time in order to determine whether the power supply voltage of the drive motor fluctuates suddenly or other situations occur, so as to make corresponding instructions in time according to the power supply voltage situation.

[0062] Step 202, in response to the power supply voltage being lower than a preset voltage threshold, the pneumatic valve is controlled to open. When the pneumatic valve is open, the high-pressure gas at the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline.

[0063] Among them, the preset voltage threshold can be set by the technical personnel of the site, and can be set based on the historical power supply voltage fluctuations of the site. The embodiment of the present application does not limit the specific value of the preset voltage threshold. For example, the power supply voltage threshold is 220V.

[0064] In one possible implementation, when the control device determines that the power supply voltage is lower than a preset voltage threshold, it determines that the power supply voltage fluctuates. When the power supply voltage fluctuates, the drive motor loses power instantly. Since the compressor outlet pressure is greater than the inlet pressure, the inertia of the compressor unit is hindered, and the speed drops rapidly, which may cause the compressor unit to surge and shut down. At this time, in order to avoid the compressor unit from surging and shutting down during voltage fluctuations, the control device immediately sends a control instruction to the pneumatic valve to control the pneumatic valve to open, so that the high-pressure gas at the compressor pipeline outlet can flow back to the compressor inlet pipeline through the auxiliary anti-surge pipeline, thereby quickly balancing the compressor inlet and outlet flows, so that the compressor inlet and outlet pressures are balanced, and the compressor speed decreases slower under the action of inertia to avoid the compressor speed dropping below the stable operating speed during power supply fluctuations.

[0065] Optionally, since the length of the auxiliary anti-surge pipeline is short, much smaller than the length of the unit anti-surge pipeline, by adding the auxiliary anti-surge pipeline, it can respond quickly when a fluctuation in the power supply voltage is detected, thereby quickly balancing the pressure at the inlet and outlet of the compressor, thereby reducing the rate of decrease in the speed of the compressor unit.

[0066] Step 203: in response to the supply voltage being higher than a preset voltage threshold, controlling the pneumatic valve to close.

[0067] Since the power supply voltage sags temporarily for a short time, generally in the millisecond level, the power supply voltage can quickly return to stability, the drive motor regains power and continues to operate, and the compressor starts to increase speed normally. At this time, there is no need to balance the flow at the compressor inlet and outlet through the auxiliary anti-surge pipeline. Therefore, in one possible implementation, when the control device determines that the power supply voltage has returned to normal, that is, the power supply voltage is higher than the preset voltage threshold, a control instruction can be sent to the pneumatic valve to control the pneumatic valve to close.

[0068] To summarize, in the embodiment of the present application, an auxiliary anti-surge pipeline and a pneumatic valve are added to the original compressor unit control system. When the control device detects that the power supply voltage of the motor fluctuates, the pneumatic valve is controlled to open so that the gas at the compressor outlet pipeline can flow back to the compressor inlet pipeline through the auxiliary anti-surge pipeline, thereby quickly balancing the pressure and flow of the compressor inlet and outlet, avoiding a rapid drop in the compressor speed, replenishing the compressor inlet flow in time, avoiding the compressor surge shutdown due to a temporary drop in the power supply voltage, and ensuring the safe and stable operation of the compressor unit.

[0069] In actual applications, the size of the pneumatic valve is generally a larger valve size. Therefore, in order to avoid the pneumatic valve being too large in size, which makes the gas flow rate in the auxiliary anti-surge pipeline too high, resulting in too high a mixing ratio of high-temperature gas at the compressor inlet pipeline, which in turn causes the compressor unit to surge, therefore, in a possible implementation, a throttling orifice plate can be designed after the pneumatic valve to adjust the gas flow rate in the auxiliary anti-surge pipeline in real time according to the on-site conditions.

[0070] like Figure 3 As shown, it shows a flowchart of a compressor anti-surge control method shown in another exemplary embodiment of the present application. The present application embodiment is applied to the method Figure 1 Taking the control device in the anti-surge control system of the compressor as an example, the method includes:

[0071] Step 301, obtaining a power supply voltage corresponding to a driving motor, where the driving motor is used to drive the compressor to rotate under the action of the power supply voltage.

[0072] The implementation of step 301 may refer to the above embodiment, and will not be described in detail in this embodiment.

[0073] Step 302, in response to the power supply voltage being lower than a preset voltage threshold, an opening command is sent to the pneumatic valve, and the pneumatic valve is used to open the valve when the opening command is received. When the pneumatic valve is in the open state, the high-pressure gas at the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline.

[0074] In one possible implementation, when the control device detects that the power supply voltage of the drive motor fluctuates, it sends an opening command to the pneumatic valve. Correspondingly, after receiving the opening command, the pneumatic valve quickly opens the valve, so that the high-pressure gas at the compressor outlet pipeline can flow back to the compressor inlet pipeline through the auxiliary anti-surge pipeline, quickly balancing the compressor inlet and outlet pressures and flows, thereby reducing the rate of decrease in the compressor speed and maintaining the normal and stable operation of the compressor.

[0075] Among them, the flow coefficient corresponding to the pneumatic valve determines the gas flow rate in the auxiliary anti-surge pipeline, thereby indirectly determining the temperature of the compressor unit inlet pipeline during gas reflux, and the compressor unit has certain restrictions on the temperature at the inlet pipeline. Therefore, in order to avoid excessive gas flow rate, which leads to excessive mixing of high-temperature gas at the compressor inlet pipeline, in a possible implementation mode, the flow coefficient of the pneumatic valve is not set too large, that is, the flow coefficient corresponding to the pneumatic valve has a maximum threshold.

[0076] Optionally, in an embodiment of the present application, after simulation, engineers determine that the flow coefficient of the pneumatic valve is between 100 and 300, which can ensure that when the gas flows to the compressor inlet through the auxiliary anti-surge pipeline, the temperature requirements at the compressor inlet are met.

[0077] Step 303, obtaining the current gas flow rate in the auxiliary anti-surge pipeline.

[0078] In actual application, the size (or flow coefficient) of the pneumatic valve is generally selected to be slightly larger. In order to avoid the pneumatic valve being too large and causing the compressor unit inlet temperature to be too high, in a possible implementation, a throttling orifice plate is provided after the pneumatic valve to adjust the gas flow rate in the auxiliary anti-surge pipeline.

[0079] Correspondingly, in actual application, the control device may monitor the gas flow rate in the auxiliary anti-surge pipeline to determine whether it is necessary to increase the throttling orifice or adjust the aperture of the throttling orifice.

[0080] Step 304, adjusting the aperture of the throttling orifice according to the current gas flow rate, the throttling orifice being used to adjust the gas flow rate in the anti-surge pipeline.

[0081] Among them, the aperture of the throttling orifice plate is adjustable, that is, the aperture of the throttling orifice plate has a certain adjustment range. For example, the aperture of the throttling orifice plate is 120mm-150mm, that is, the aperture of the throttling orifice plate can be adjusted between 120 and 150mm.

[0082] In one possible implementation, a throttling orifice can be set behind the pneumatic valve. When it is determined that the gas flow rate of the auxiliary anti-surge pipeline is appropriate and no throttling orifice is needed, the throttling orifice can maintain the maximum aperture value. If it is determined that the gas flow rate in the auxiliary anti-surge pipeline is too fast, the aperture of the throttling orifice can be appropriately reduced according to the degree of excessive gas flow rate, so as to adjust the gas flow rate in the auxiliary anti-surge pipeline in real time according to the on-site conditions, thereby ensuring that when the compressor outlet gas flows back to the compressor inlet through the auxiliary anti-surge pipeline, the compressor inlet temperature requirement can be met, avoiding surge shutdown of the compressor unit due to excessively high inlet temperature, and further ensuring the normal and stable operation of the compressor unit.

[0083] In an exemplary embodiment, the process of adjusting the aperture of the throttling orifice plate according to the gas flow rate in the auxiliary anti-surge line may include the following steps:

[0084] 1. In response to the current gas flow rate being greater than a first preset flow rate threshold, the aperture of the throttling orifice is controlled to be reduced, so as to reduce the gas flow rate in the auxiliary anti-surge pipeline by reducing the aperture of the throttling orifice.

[0085] Among them, the first preset flow rate threshold is set by engineering personnel according to the compressor inlet pipeline temperature requirement, that is, the first preset flow rate threshold indicates the maximum gas flow rate that does not exceed the compressor inlet temperature requirement when the high-temperature gas flows back to the compressor inlet through the auxiliary anti-surge pipeline. The embodiment of the present application does not limit the specific value of the first preset flow rate threshold.

[0086] Optionally, the selection of the first preset flow rate threshold may also be related to the length of the auxiliary anti-surge pipeline, the size of the compressor inlet pipeline, etc. The engineering personnel can obtain the first preset flow rate threshold by comprehensive analysis based on the above factors.

[0087] In one possible implementation, if the control device monitors that the current gas flow rate in the auxiliary anti-surge pipeline is greater than the first preset flow rate threshold, it means that if the compressor outlet gas flows back to the compressor inlet at the current gas flow rate, it may cause excessive mixing of high-temperature gas at the compressor inlet pipeline, causing the compressor inlet gas pressure to increase and cause unit surge. Therefore, it is necessary to reduce the size of the throttling orifice to reduce the gas flow rate in the auxiliary anti-surge pipeline.

[0088] In an exemplary example, if the control device monitors that the current gas flow rate in the auxiliary anti-surge pipeline is greater than the first preset flow rate threshold, and the aperture size of the throttling orifice is 160 mm at this time, it is necessary to reduce the aperture of the throttling orifice to reduce the gas flow rate in the auxiliary anti-surge pipeline. The aperture size of the throttling orifice can be adjusted from 160 mm to 150 mm.

[0089] 2. In response to the current gas flow rate being less than a second preset flow rate threshold, controlling to increase the aperture of the throttling orifice plate, thereby increasing the gas flow rate in the auxiliary anti-surge pipeline by increasing the aperture of the throttling orifice plate, wherein the second preset flow rate threshold is less than the first preset flow rate threshold.

[0090] Among them, the second preset flow rate threshold indicates the minimum gas flow rate at which the auxiliary anti-surge pipeline can quickly balance the air pressure between the inlet and outlet of the compressor. That is to say, if the gas flow rate in the auxiliary anti-surge pipeline is lower than the second preset flow rate threshold, the compressor inlet flow may not be replenished in time, causing the compressor outlet pressure to be too high and causing the unit to surge.

[0091] Optionally, the second preset flow rate threshold is smaller than the first preset flow rate threshold.

[0092] In one possible implementation, if the control device monitors that the gas flow rate in the auxiliary anti-surge pipeline is lower than the second preset flow rate threshold, it means that the current gas flow rate is too low and may not be able to quickly balance the gas pressure at the inlet and outlet of the compressor. At this time, the aperture of the throttling orifice plate can be increased to increase the gas flow rate in the auxiliary anti-surge pipeline.

[0093] In an exemplary example, if the control device detects that the gas flow rate in the auxiliary anti-surge pipeline is too low and is lower than the second preset flow rate threshold, at this time, the aperture size of the throttling orifice is 120 mm, and the aperture size of the throttling orifice needs to be increased to increase the gas flow rate in the auxiliary anti-surge pipeline. Correspondingly, the aperture size of the throttling orifice can be adjusted from 120 mm to 150 mm.

[0094] Step 305, in response to the power supply voltage being higher than a preset voltage threshold and the time for the power supply voltage to recover to be higher than the preset voltage threshold reaching a preset time threshold, a closing instruction is sent to the pneumatic valve, and the pneumatic valve is used to close the valve when receiving the closing instruction.

[0095] Since unstable power supply voltage may cause unit surge, when determining the timing to close the pneumatic valve, consideration should be given to whether the voltage has returned to stability, so as to avoid the situation where the voltage only briefly returns to normal levels and then drops again, resulting in the need to frequently open and close the pneumatic valve. Therefore, in one possible implementation, when the control device determines that the power supply voltage of the drive motor is higher than the preset voltage threshold, that is, after returning to normal levels, and within a preset period of time, the power supply voltage remains at normal levels, a closing command is issued to the pneumatic valve to control the pneumatic valve to close.

[0096] Among them, the preset time threshold can be set by engineering personnel according to historical power supply voltage fluctuations. For example, the preset time threshold can be 2 seconds. The embodiment of the present application does not limit the specific value of the preset time threshold.

[0097] In this embodiment, a throttling orifice with adjustable aperture is provided behind the pneumatic valve, so that the gas flow rate of the auxiliary anti-surge pipeline can be adjusted. That is, when the gas flow rate is too large, the gas flow rate can be reduced by reducing the size of the throttling orifice to avoid excessive gas flow rate leading to excessive compressor inlet pressure causing unit surge; when the gas flow rate is too small, the gas flow rate can be increased by increasing the size of the throttling orifice to avoid the gas flow rate being too small to balance the compressor inlet and outlet pressure in time; in addition, by closing the pneumatic valve after determining that the power supply voltage has returned to stability for a period of time, it is possible to avoid the need to frequently open and close the pneumatic valve due to unstable power supply voltage.

[0098] In an illustrative example, a simulation was carried out at a station of the West-East Gas Pipeline according to the method shown in the above embodiment. By simultaneously performing simulation transformation on the four compressor units of the station, an auxiliary anti-surge pipeline was added between the inlet pipeline and the outlet pipeline of the compressor unit. A pneumatic valve was arranged on the auxiliary anti-surge pipeline. The length of the auxiliary anti-surge pipeline was 16.8m. The pneumatic valve used was a DN200 pneumatic quick-opening valve. A throttling orifice plate was connected behind the auxiliary anti-surge valve. The diameter of the throttling orifice plate was 150mm.

[0099] After the system simulation transformation is completed, during the debugging process, the power supply voltage is simulated to temporarily drop for 1000 milliseconds. The specific simulation process is as follows:

[0100] The three compressor units in the simulation station automatically meet the distribution and work stably under the condition of 3760rpm. The simulated power supply voltage is temporarily reduced, and the three motors stop power output instantly. Under the load, the speed of the compressor unit drops rapidly. At the same time, the control device detects the drop in power supply voltage and sends an opening command to the pneumatic valves corresponding to the three compressor units. Correspondingly, the pneumatic valves open quickly after receiving the opening command. Under the action of pressure difference, the high-pressure gas of the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline, which can quickly balance the pressure of the compressor inlet and outlet pipelines, slowing down the speed drop of the compressor unit, and controlling the original anti-surge valve of the compressor unit to open. When the power supply voltage drops temporarily and returns to normal, the motor power is restored. At this time, the speeds of the three compressor units drop to 3183rpm, 3190rpm and 3211rpm respectively, and none of them drops below 3120rpm (3120rpm is the lowest stable operating speed). When the compressor units were restarted, the control device detected that the power supply voltage of the motor returned to normal level and lasted for 2 seconds, and sent a closing command to the pneumatic valves corresponding to the three compressor units. Correspondingly, the pneumatic valves closed quickly after receiving the closing command. Subsequently, the original anti-surge valves of the three compressor units were gradually closed as adjusted. During the whole process, the inlet temperatures of the three compressor units rose to 82.9℃, 83.3℃ and 83.1℃ respectively, and the three compressor units automatically resumed normal operation.

[0101] Through continuous simulation and operation, it is shown that by implementing the technical transformation of auxiliary anti-surge pipelines on pipeline compressor units, the compressor units can be effectively prevented from surging due to temporary drop in power supply voltage, so that during the temporary drop in power supply voltage, the speed of the compressor units can be prevented from being lower than the minimum stable operating speed, and the probability of the compressor units shutting down due to power supply voltage fluctuations can be reduced. At the same time, the imbalance of the inlet and outlet gas pressures of the compressor can be avoided, and the gas balance can be quickly stabilized, ensuring that the compressor units can automatically resume normal and stable operation. Since the units automatically return to normal operation, the transformation can greatly reduce the unit failure shutdown, further ensuring the normal operation of the compressor units.

[0102] Please refer to Figure 4 , which shows a structural block diagram of a compressor unit anti-surge control device provided by an exemplary embodiment of the present application, the device is used to implement part or all of the control device, and the device includes:

[0103] A first acquisition module 401 is used to acquire a power supply voltage corresponding to a drive motor, wherein the drive motor is used to drive the compressor to rotate under the action of the power supply voltage;

[0104] A first control module 402, configured to control the pneumatic valve to open in response to the power supply voltage being lower than a preset voltage threshold, wherein when the pneumatic valve is opened, the high-pressure gas at the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline;

[0105] The second control module 403 is configured to control the pneumatic valve to close in response to the supply voltage being higher than the preset voltage threshold.

[0106] Optionally, a throttling orifice plate is arranged behind the pneumatic valve, and the aperture of the throttling orifice plate is adjustable;

[0107] The device also includes:

[0108] A second acquisition module is used to acquire a current gas flow rate corresponding to the auxiliary anti-surge pipeline;

[0109] The regulating module is used to adjust the aperture of the throttling orifice according to the current gas flow rate, and the throttling orifice is used to adjust the gas flow rate in the anti-surge pipeline.

[0110] Optionally, the adjustment module includes:

[0111] a first regulating unit, configured to control the reduction of the aperture of the throttling orifice plate in response to the current gas flow rate being greater than a first preset flow rate threshold, so as to reduce the gas flow rate in the auxiliary anti-surge pipeline by reducing the aperture of the throttling orifice plate;

[0112] The second regulating unit is used to control the increase of the aperture of the throttling orifice plate in response to the current gas flow rate being less than a second preset flow rate threshold, thereby increasing the gas flow rate in the auxiliary anti-surge pipeline by increasing the aperture of the throttling orifice plate, wherein the second preset flow rate threshold is less than the first preset flow rate threshold.

[0113] Optionally, the second control module 403 includes:

[0114] The control unit is used to control the pneumatic valve to close in response to the supply voltage being higher than the preset voltage threshold and the time duration for the supply voltage to recover to be higher than the preset voltage threshold reaching a preset time duration threshold.

[0115] Optionally, the first control module 402 includes:

[0116] A first sending unit, used for sending an opening instruction to the pneumatic valve, and the pneumatic valve is used for opening the valve upon receiving the opening instruction;

[0117] The second control module 403 includes:

[0118] The second sending unit is used to send a closing instruction to the pneumatic valve, and the pneumatic valve is used to close the valve when receiving the closing instruction.

[0119] To summarize, in the embodiment of the present application, an auxiliary anti-surge pipeline and a pneumatic valve are added to the original compressor unit control system. When the control device detects that the power supply voltage of the motor fluctuates, the pneumatic valve is controlled to open so that the gas at the compressor outlet pipeline can flow back to the compressor inlet pipeline through the auxiliary anti-surge pipeline, thereby quickly balancing the pressure and flow of the compressor inlet and outlet, avoiding a rapid drop in the compressor speed, replenishing the compressor inlet flow in time, avoiding the compressor surge shutdown due to a temporary drop in the power supply voltage, and ensuring the safe and stable operation of the compressor unit.

[0120] It should be noted that the compressor anti-surge control device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the equipment can be divided into different functional modules to complete all or part of the above description.

[0121] The present application also provides a computer device, which includes a processor and a memory, wherein the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the compressor anti-surge control method provided by each of the above method embodiments. It should be noted that the computer device is the control device shown in the above embodiment, and the computer device can be as follows Figure 5 Computer equipment provided.

[0122] Please refer to Figure 5 It shows a schematic diagram of the structure of a computer device provided by an exemplary embodiment of the present application. Specifically, the computer device 500 includes a central processing unit (CPU) 501, a system memory 504 including a random access memory (RAM) 502 and a read-only memory (ROM) 503, and a system bus 505 connecting the system memory 504 and the central processing unit 501. The computer device 500 also includes a basic input / output (I / O) system 506 that helps transmit information between various devices in the computer, and a large-capacity storage device 507 for storing an operating system 513, application programs 514 and other program modules 515.

[0123] The basic input / output system 506 includes a display 508 for displaying information and an input device 509 such as a mouse and a keyboard for user inputting information. The display 508 and the input device 509 are connected to the central processing unit 501 through an input / output controller 510 connected to the system bus 505. The basic input / output system 506 may also include an input / output controller 510 for receiving and processing inputs from a plurality of other devices such as a keyboard, a mouse, or an electronic stylus. Similarly, the input / output controller 510 also provides output to a display screen, a printer, or other types of output devices.

[0124] The mass storage device 507 is connected to the central processing unit 501 through a mass storage controller (not shown) connected to the system bus 505. The mass storage device 507 and its associated computer readable media provide non-volatile storage for the computer device 500. That is, the mass storage device 507 may include a computer readable medium (not shown) such as a hard disk or CD-ROM drive.

[0125] Without loss of generality, computer readable media may include computer storage media and communication media. Computer storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer readable instructions, data structures, program modules or other data. Computer storage media include RAM, ROM, Erasable Programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), flash memory or other solid-state storage technology, CD-ROM, Digital Video Disc (DVD) or other optical storage, cassettes, magnetic tapes, disk storage or other magnetic storage devices. Of course, those skilled in the art will appreciate that computer storage media are not limited to the above. The above-mentioned system memory 504 and mass storage device 507 can be collectively referred to as memory.

[0126] The memory stores one or more programs, and the one or more programs are configured to be executed by one or more central processing units 501. The one or more programs contain instructions for implementing the above-mentioned compressor anti-surge control method. The central processing unit 501 executes the one or more programs to implement the compressor anti-surge control method provided by the above-mentioned various method embodiments.

[0127] According to various embodiments of the present application, the computer device 500 can also be connected to a remote computer on the network through a network such as the Internet. That is, the computer device 500 can be connected to the network 512 through the network interface unit 511 connected to the system bus 505, or the network interface unit 511 can be used to connect to other types of networks or remote computer systems (not shown).

[0128] The memory also includes one or more programs, which are stored in the memory. The one or more programs include steps executed by the control device in the compressor anti-surge control method provided in the embodiment of the present application.

[0129] A person skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, which can be a computer-readable storage medium contained in the memory in the above embodiments; or a computer-readable storage medium that exists independently and is not assembled into a computer device. The computer-readable storage medium stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the above compressor anti-surge control method.

[0130] Optionally, the computer readable storage medium may include: ROM, RAM, solid state drives (SSD) or optical disks, etc. Among them, the random access memory may include resistance random access memory (ReRAM) and dynamic random access memory (DRAM).

[0131] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0132] According to one aspect of the present application, a computer program product or a computer program is provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the compressor anti-surge control method provided in various optional implementations of the above aspects.

[0133] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A compressor anti-surge control method, characterized in that: The method is applied to a control device, and the method comprises: Obtaining a power supply voltage corresponding to a drive motor, wherein the drive motor is used to drive the compressor to rotate under the action of the power supply voltage; In response to the power supply voltage being lower than a preset voltage threshold, the pneumatic valve is controlled to open. When the pneumatic valve is in the open state, the high-pressure gas at the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline. A throttling orifice plate is arranged behind the pneumatic valve. The aperture of the throttling orifice plate is adjustable. The throttling orifice plate is used to adjust the gas flow rate in the auxiliary anti-surge pipeline. Acquiring a current gas flow rate in the auxiliary anti-surge pipeline; In response to the current gas flow rate being greater than a first preset flow rate threshold, controlling to reduce the aperture of the throttling orifice plate, so as to reduce the gas flow rate in the auxiliary anti-surge line by reducing the aperture of the throttling orifice plate, wherein the first preset flow rate threshold indicates a maximum gas flow rate that does not exceed a compressor inlet temperature requirement when high-temperature gas flows back to the compressor inlet line through the auxiliary anti-surge line; In response to the current gas flow rate being less than a second preset flow rate threshold, controlling to increase the aperture of the throttling orifice plate, so as to increase the gas flow rate in the auxiliary anti-surge pipeline by increasing the aperture of the throttling orifice plate, wherein the second preset flow rate threshold indicates the lowest gas flow rate for the auxiliary anti-surge pipeline to quickly balance the gas pressure between the inlet and outlet of the compressor, wherein the second preset flow rate threshold is less than the first preset flow rate threshold; In response to the supply voltage being higher than the preset voltage threshold, the pneumatic valve is controlled to be closed.

2. The method according to claim 1, characterized in that In response to the supply voltage being higher than the preset voltage threshold, controlling the pneumatic valve to close comprises: In response to the supply voltage being higher than the preset voltage threshold, and the time duration for which the supply voltage recovers to be higher than the preset voltage threshold reaching a preset time duration threshold, the pneumatic valve is controlled to be closed.

3. The method according to claim 1, characterized in that The controlling the pneumatic valve to open comprises: Sending an opening instruction to the pneumatic valve, wherein the pneumatic valve is used to open the valve upon receiving the opening instruction; The controlling the pneumatic valve to close comprises: A closing instruction is sent to the pneumatic valve, and the pneumatic valve is used to close the valve when receiving the closing instruction.

4. A compressor anti-surge control device, characterized in that: The device is applied to a control device, and the device comprises: A first acquisition module is used to acquire a power supply voltage corresponding to a drive motor, wherein the drive motor is used to drive the compressor to rotate under the action of the power supply voltage; a first control module, configured to control the pneumatic valve to open in response to the power supply voltage being lower than a preset voltage threshold, wherein when the pneumatic valve is in an open state, the high-pressure gas at the compressor outlet pipeline flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline, and a throttling orifice plate is arranged behind the pneumatic valve, the aperture of the throttling orifice plate is adjustable, and the throttling orifice plate is used to adjust the gas flow rate in the auxiliary anti-surge pipeline; A second acquisition module, configured to acquire a current gas flow rate in the auxiliary anti-surge pipeline; a second control module, configured to control the reduction of the aperture of the throttling orifice plate in response to the current gas flow rate being greater than a first preset flow rate threshold, so as to reduce the gas flow rate in the auxiliary anti-surge pipeline by reducing the aperture of the throttling orifice plate, wherein the first preset flow rate threshold indicates a maximum gas flow rate that does not exceed a compressor inlet temperature requirement when the high-temperature gas flows back to the compressor inlet pipeline through the auxiliary anti-surge pipeline; a third control module, configured to control increasing the aperture of the throttling orifice plate in response to the current gas flow rate being less than a second preset flow rate threshold, so as to increase the gas flow rate in the auxiliary anti-surge pipeline by increasing the aperture of the throttling orifice plate, wherein the second preset flow rate threshold indicates a minimum gas flow rate for the auxiliary anti-surge pipeline to quickly balance the gas pressure between the inlet and outlet of the compressor, wherein the second preset flow rate threshold is less than the first preset flow rate threshold; The fourth control module is used to control the pneumatic valve to close in response to the supply voltage being higher than the preset voltage threshold.

5. A control device, characterized in that: The control device comprises a processor and a memory, wherein the memory stores at least one instruction, and the at least one instruction is executed by the processor to implement the compressor anti-surge control method as described in any one of claims 1 to 3 above.

6. A compressor anti-surge control system, characterized in that: The compressor anti-surge control system includes a compressor, a motor, a compressor inlet pipeline, a compressor outlet pipeline, a unit anti-surge pipeline, an auxiliary anti-surge pipeline, a pneumatic valve, a throttle orifice plate and a control device; The motor is electrically connected to the compressor and is used to drive the compressor to rotate; The compressor is used to compress the low-pressure gas flowing into the compressor inlet pipeline to obtain high-pressure gas, and discharge it through the compressor outlet pipeline; The unit anti-surge pipeline is used to connect the compressor inlet pipeline and the compressor outlet pipeline, and the unit anti-surge pipeline is used to provide a flow channel for the high-pressure gas to flow back from the compressor outlet pipeline to the compressor inlet pipeline in a flow state; The auxiliary anti-surge pipeline connects the compressor inlet pipeline and the compressor outlet pipeline, and the auxiliary anti-surge pipeline is used to provide a flow channel for the high-pressure gas to flow back from the compressor outlet pipeline to the compressor inlet pipeline in a flow state, wherein the length of the auxiliary anti-surge pipeline is less than the length of the unit anti-surge pipeline; The pneumatic valve is arranged on the auxiliary anti-surge pipeline and is used to control the on-off state of the auxiliary anti-surge pipeline; The throttling orifice is connected to the pneumatic valve, and the throttling orifice is used to adjust the gas flow rate in the auxiliary anti-surge pipeline; The control device is electrically connected to the pneumatic valve, and the control device is used to control the pneumatic valve to open when it is detected that the power supply voltage of the motor decreases; obtain the current gas flow rate in the auxiliary anti-surge pipeline; in response to the current gas flow rate being greater than a first preset flow rate threshold, control the reduction of the aperture of the throttling orifice plate, and reduce the gas flow rate in the auxiliary anti-surge pipeline by reducing the aperture of the throttling orifice plate, wherein the first preset flow rate threshold indicates the maximum gas flow rate that does not exceed the compressor inlet temperature requirement when the high-temperature gas flows back to the compressor inlet through the auxiliary anti-surge pipeline; in response to the current gas flow rate being less than a second preset flow rate threshold, control the increase of the aperture of the throttling orifice plate, and increase the gas flow rate in the auxiliary anti-surge pipeline by increasing the aperture of the throttling orifice plate, wherein the second preset flow rate threshold indicates the minimum gas flow rate for the auxiliary anti-surge pipeline to quickly balance the gas pressure between the inlet and outlet of the compressor, wherein the second preset flow rate threshold is less than the first preset flow rate threshold; and control the pneumatic valve to close when it is detected that the power supply voltage of the motor is restored.

7. The compressor anti-surge control system according to claim 6, characterized in that: The pneumatic valve has a preset flow coefficient, which is between 100 and 300, and the length of the auxiliary anti-surge pipeline is less than or equal to 30m.

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