Control method and device for compressor unit, compressor unit and storage medium

Abstract

The invention discloses a control method and device for a compressor unit, the compressor unit and a storage medium. The compressor unit comprises a compressor, a loading valve, an outlet valve, an outlet bypass valve and an anti-surge valve, the compressor is connected with the outlet valve and the anti-surge valve, the anti-surge valve is connected with the loading valve and the outlet valve, the outlet bypass valve is connected with the outlet valve in parallel, and the control method comprises the steps that the loading valve is controlled to be opened, and the compressor is controlled to start natural gas replacement operation; carrying out first purging operation on a unit shell of the compressor; after the first purging operation is completed, the anti-surge valve is controlled to be opened, so that second purging operation is conducted on the pipeline corresponding to the anti-surge valve; and after the second purging operation is completed, the loading valve is controlled to be closed, and the outlet bypass valve is controlled to be opened, so that the pipeline corresponding to the outlet valve is controlled to perform third purging operation. According to the scheme, the corresponding pipeline can be thoroughly purged and replaced, and the operation reliability of the compressor station is improved.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent control of gas compressor stations, and in particular to a control method and device for a compressor unit, a compressor unit and a storage medium. Background Art

[0002] With the continuous development of my country's long-distance natural gas pipelines, the continuous advancement of the concept of smart pipeline construction, and the transformation of the natural gas pipeline production management model, the continuous promotion of the regional management model of the compressor station has put forward higher requirements for the control level and control function of the gas pipeline. As an important part of the long-distance natural gas pipeline, the compressor unit needs to realize the remote operation and automatic control functions of the compressor unit at the station and the control center without human intervention. Usually, the pipeline of the compressor unit needs to be purged and cleaned, but the existing unit purging method has the hidden danger of incomplete pipeline gas replacement. Usually, the warm-up time is 40 minutes regardless of the unit state during warm-up. There is an unnecessary warm-up time when the unit is restarted within two hours, which affects the startup efficiency. When performing the startup operation, a large number of on-site inspections and condition checks are required manually. The operation is cumbersome and misjudgments occur from time to time. At the same time, the test steps for the oil pump in the startup sequence are not perfect, and there is a risk of failure during operation. The actual unit and pipeline air resistance are different in the purge step before starting, and it cannot be effectively purged, and the dry gas seal intake valve throttling time is long and the valve is easily damaged. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a control method, device, compressor unit and storage medium for a compressor unit, so as to solve the technical problem of incomplete pipeline gas replacement in the purge method in the prior art.

[0004] In order to achieve the above-mentioned object, the first aspect of the present application provides a control method for a compressor unit, the compressor unit includes a compressor, a loading valve, an outlet valve, an outlet bypass valve, and an anti-surge valve, the compressor is connected to the outlet valve and the anti-surge valve respectively, the anti-surge valve is connected to the loading valve and the outlet valve respectively, the outlet bypass valve is connected in parallel with the outlet valve, and the control method includes: Controlling the loading valve to open, and controlling the compressor to start the natural gas replacement operation, so as to perform a first purge operation on the unit casing of the compressor; After the first purge operation is completed, the anti-surge valve is controlled to open to perform a second purge operation on the pipeline corresponding to the anti-surge valve; After the second purge operation is completed, the loading valve is controlled to be closed, and the outlet bypass valve is controlled to be opened, so as to control the pipeline corresponding to the outlet valve to perform the third purge operation.

[0005] In an embodiment of the present application, the compressor unit also includes a vent valve, a dry gas seal intake valve and an oil pump device, and the dry gas seal intake valve, the loading valve, the vent valve and the oil pump device are all connected to the compressor, and the control method includes: before controlling the compressor to start the replacement operation, receiving a start-up instruction for the compressor unit sent by the control center; controlling the vent valve and the anti-surge valve to close according to the start-up instruction; controlling the oil pump device to start and execute the corresponding test logic; after the oil pump device completes the corresponding test logic, confirming whether the anti-surge valve is completely closed; when the anti-surge valve is completely closed, sequentially controlling the dry gas seal intake valve, the loading valve and the vent valve to open to complete the preparation for the replacement operation.

[0006] In an embodiment of the present application, the compressor unit also includes an inlet valve connected to the loading valve, and the control method also includes: after completing the third purge operation, closing the outlet bypass valve, closing the vent valve, opening the loading valve, opening the inlet valve, opening the outlet bypass valve, opening the outlet valve, closing the loading valve, and closing the outlet bypass valve in sequence.

[0007] In an embodiment of the present application, the compressor unit also includes a frequency converter, and the control method also includes: after closing the outlet bypass valve, performing a secondary confirmation operation for starting the compressor unit, the data confirmed by the secondary confirmation operation include three-out-of-two oil pressures, lubricating oil main pipe pressure, lubricating oil temperature after cooling, anti-surge valve status, inlet valve status, outlet valve status, oil pump device operating status, motor mode, post-isolation gas pressure, outlet bypass valve status, vent valve status, compressor start-up variable status, normal and interlocking shutdown signal status, frequency converter ready status, dry gas seal start-up variable status, drive end and non-drive end air supply flow, drive end support bearing oil inlet flow, non-drive end thrust bearing oil inlet flow, non-drive end support bearing oil inlet flow, dry gas seal heater over-temperature signal variable status, dry gas seal heater comprehensive fault variable status, motor external cooling water system ready status; when the confirmation result of the secondary confirmation operation is qualified, start the frequency converter inversion to perform the compressor unit start-up operation.

[0008] In an embodiment of the present application, the compressor unit includes an external motor cooling system, and the control method also includes: determining the current operating condition of the compressor unit before the oil pump device is started and the corresponding test logic is executed; when the current operating condition is a cold standby state, controlling the working mode of the compressor unit to switch from a cold standby state to a hot standby state, and the working time of the compressor unit from the cold standby state to the hot standby state until the compressor unit starts is less than or equal to a first preset time, so as to start the external motor cooling system; when the current operating condition is a hot standby state, controlling the working mode of the compressor unit to a hot standby state, and the working time of the compressor unit from the hot standby state to the compressor unit starting is less than or equal to a second preset time, so as to start the external motor cooling system, wherein the first preset time is greater than the second preset time.

[0009] In an embodiment of the present application, the oil pump device includes an emergency oil pump, a main oil pump and a standby oil pump, and controlling the oil pump device to start and execute the corresponding test logic includes: obtaining a sequential control sequence variable corresponding to the start-up instruction; when the sequential control sequence variable is a first preset variable, obtaining a first outlet pressure of the standby emergency oil pump; when the first outlet pressure is less than or equal to a first pressure threshold, controlling the emergency oil pump to start, and obtaining a first operating time when the first outlet pressure is at a first preset pressure; when the first operating time is greater than or equal to the first time threshold, controlling the emergency oil pump to stop running; when the sequential control sequence variable is a second preset variable, sequentially controlling the main oil pump and the standby oil pump to start running; sequentially obtaining a second outlet pressure of the standby oil pump and a third outlet pressure of the main oil pump; when the second outlet pressure is at a second preset pressure and the second operating time is greater than or equal to the second time threshold, controlling the standby oil pump to stop running; when the standby jacking pump stops running for a stop time greater than or equal to the third time threshold, starting the main oil pump; when the third outlet pressure is at a third preset pressure and the third operating time is greater than or equal to the fourth time threshold, determining that the oil pump device successfully completes the test logic.

[0010] In an embodiment of the present application, the compressor unit also includes a main lifting pump and a standby lifting pump, and the control method also includes: after the oil pump device completes the corresponding test logic, before confirming whether the anti-surge valve is completely closed, obtaining the sequential control timing variable corresponding to the start-up instruction; when the sequential control timing variable is a third preset variable, controlling the main lifting pump and the standby lifting pump to start running in sequence; obtaining the fifth outlet pressure of the standby lifting pump and the sixth outlet pressure of the main lifting pump in sequence; when the fourth outlet pressure is at the fourth preset pressure and the fourth operating time is greater than or equal to the fourth time threshold, controlling the standby lifting pump to stop running; when the stop time of the standby lifting pump is greater than or equal to the fifth time threshold, starting the main lifting pump; when the fifth outlet pressure is at the fifth preset pressure and the fifth operating time is greater than or equal to the sixth time threshold, determining that the main lifting pump and the standby lifting pump have successfully completed the corresponding test logic.

[0011] A second aspect of the present application provides a control device for a compressor unit, comprising: a memory configured to store instructions; The processor is configured to call instructions from the memory and implement the above-mentioned control method for the compressor unit when executing the instructions.

[0012] A third aspect of the present application provides a compressor unit, comprising: A compressor, a loading valve, an outlet valve, an outlet bypass valve, and an anti-surge valve, wherein the compressor is connected to the outlet valve and the anti-surge valve respectively, the loading valve is connected to the inlet valve, and the outlet bypass valve is connected to the outlet valve; And a control device for a compressor unit according to the above.

[0013] A fourth aspect of the present application provides a machine-readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the above-mentioned control method for a compressor unit.

[0014] Through the above technical scheme, the compressor unit includes a compressor, a loading valve, an outlet valve, an outlet bypass valve, and an anti-surge valve. The compressor is connected to the outlet valve and the anti-surge valve respectively, the anti-surge valve is connected to the loading valve and the outlet valve respectively, and the outlet bypass valve is connected in parallel with the outlet valve. By controlling the loading valve to open and controlling the compressor to start the replacement operation of natural gas, the first purge operation is performed on the compressor unit shell; after completing the first purge operation, the anti-surge valve is controlled to open to perform the second purge operation on the pipeline corresponding to the anti-surge valve; after completing the second purge operation, the loading valve is controlled to close, and the outlet bypass valve is controlled to open to control the pipeline corresponding to the outlet valve to perform the third purge operation. The above scheme can realize the thorough purge and replacement of the corresponding pipelines and improve the reliability of the compressor station operation.

[0015] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings: Figure 1a A schematic diagram of the structure of a gas circuit system of a compressor unit according to an embodiment of the present application is shown; Figure 1b A schematic diagram of the structure of a sealing system of a compressor unit according to an embodiment of the present application is shown; Figure 2 A schematic diagram of a flow chart of a control method for a compressor unit according to an embodiment of the present application is schematically shown; Figure 3 A schematic diagram of a process flow of timing controlled startup according to an embodiment of the present application is shown; Figure 4 A structural block diagram of a control device for a compressor unit according to an embodiment of the present application is schematically shown; Figure 5 The schematic diagram shows a structure of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0020] Figure 1a The schematic diagram of the structure of the gas circuit system of a compressor unit according to an embodiment of the present application is shown. The gas circuit system of the compressor unit includes a compressor, a loading valve, an outlet valve, an outlet bypass valve, and an anti-surge valve. The compressor is connected to the outlet valve and the anti-surge valve respectively, the anti-surge valve is connected to the loading valve and the outlet valve respectively, and the outlet bypass valve is connected in parallel with the outlet valve. The anti-surge valve is used to prevent the compressor unit from surging during operation. The anti-surge valve adjusts the gas flow of the compressor unit so that the compressor unit is away from the surge boundary and maintains stable operation. The loading valve is mainly used in the compressor unit to purge the unit casing and the anti-surge valve, and balance the pressure at both ends of the inlet valve to avoid damage to the inlet valve when opening and closing under a large pressure difference; the outlet bypass valve is mainly used to purge the outlet valve and the outlet check valve pipeline, and balance the differential pressure on both sides of the outlet valve to avoid damage to the outlet valve when opening and closing under a large pressure difference.

[0021] Figure 1b The structural diagram of a sealing system of a compressor unit according to an embodiment of the present application is schematically shown. Figure 1bAs shown, the sealing system of the compressor unit includes a dry gas sealing intake valve XV-0282, which is connected to the compressor and is used to cut off or connect the industrial gas from the downstream of the boosting system to the compressor.

[0022] Figure 2 The flowchart of a control method for a compressor unit according to an embodiment of the present application is schematically shown. Figure 2 As shown, the embodiment of the present application provides a control method for a compressor unit, and the control method is applied to Figure 1a For the compressor unit shown, the control method may include the following steps.

[0023] S202, controlling the loading valve to open, and controlling the compressor to start the replacement operation of natural gas, so as to perform a first purge operation on the unit casing of the compressor.

[0024] S204, after the first purge operation is completed, the anti-surge valve is controlled to open, so as to perform a second purge operation on the pipeline corresponding to the anti-surge valve.

[0025] S206, after completing the second purge operation, controlling the loading valve to close, and controlling the outlet bypass valve to open, so as to control the pipeline corresponding to the outlet valve to perform a third purge operation.

[0026] The purge logic in the prior art is a single continuous purge, usually a single continuous purge for 120 seconds. However, such a purge at the time had the risk of incomplete replacement of pipeline gas. Therefore, the purge logic was optimized, and the purge logic was optimized from the original single continuous purge of 120 seconds to a three-stage purge of the shell, anti-surge valve pipeline and outlet pipeline, which solved the hidden danger of incomplete replacement of pipeline gas. Specifically, the loading valve is controlled to open, and the compressor is controlled to start the replacement operation of natural gas to perform the first purge operation on the unit shell of the compressor. The replacement operation refers to introducing the high-pressure natural gas in the compressor inlet manifold into the unit pipeline through the loading valve to pressurize the unit and the pipeline. Before the replacement operation is performed, the loading valve GV-0201 can be opened to purge the unit shell of the compressor, and the gas can be discharged through the vent valve BDV-0201. Furthermore, the second purge operation requires opening the anti-surge valve FCV-0201, and the gas passes through the pipeline connecting the loading valve GV-0201 and the anti-surge valve FCV-0201, passes through the anti-surge valve FCV-0201, and then passes through the pipeline connecting the anti-surge valve FCV-0201 and the vent valve BDV-0201, and then discharges the gas through the vent valve BDV-0201, thereby purging the pipeline corresponding to the anti-surge valve. Furthermore, the third purge operation is to close the loading valve GV-0201, open the outlet bypass valve GV-0202, and discharge the gas through the pipeline connecting the outlet bypass valve GV-0202 and the vent valve BDV-0201, and then discharge the gas through the vent valve BDV-0201, thereby purging the pipeline corresponding to the outlet valve. In this way, the problem of incomplete and insufficient unit replacement can be solved, and the system safety is improved.

[0027] In an embodiment of the present application, the compressor unit also includes a vent valve, a dry gas seal intake valve and an oil pump device, and the dry gas seal intake valve, the loading valve, the vent valve and the oil pump device are all connected to the compressor, and the control method includes: before controlling the compressor to start the replacement operation, receiving a start-up instruction for the compressor unit sent by the control center; controlling the vent valve and the anti-surge valve to close according to the start-up instruction; controlling the oil pump device to start and execute the corresponding test logic; after the oil pump device completes the corresponding test logic, confirming whether the anti-surge valve is completely closed; when the anti-surge valve is completely closed, sequentially controlling the dry gas seal intake valve, the loading valve and the vent valve to open to complete the preparation for the replacement operation.

[0028] Specifically, during the timing control process, the anti-surge valve and the vent valve are optimized from the original action in the purge stage to the action in the initial activation stage of the timing. Specifically, the start-up instruction for the compressor unit sent by the control center can be received, and the start-up timing of multiple devices included in the compressor unit can be controlled by the timing control module based on the start-up instruction. In addition, the fault signal can be automatically reset according to the start-up instruction. According to the start-up instruction, the vent valve and the anti-surge valve can be controlled to close first. In this way, the valve action time and the start-up time can be shortened, and the performance of the anti-surge valve and the vent valve can be tested in advance, so as to find problems and make timely adjustments. Testing the performance of the vent valve in advance can avoid the failure of the start-up caused by the valve action failure in the pressurization stage. On the other hand, during the unit startup process of the compressor unit, the outlet branch pressure is not enough to provide high-pressure sealing gas, and the sealing gas is provided by the boost skid manifold branch. Among them, the dry gas sealing intake valve is located downstream of the sealing gas boost skid, and the timing of opening the dry gas sealing intake valve is adjusted to after the oil pump detection and before the purge replacement, so as to reduce the valve throttling time, avoid equipment freezing and blockage, and ensure the normal operation of the dry gas sealing system. Therefore, after the vent valve and anti-surge valve are closed, the oil pump device is started and the corresponding test logic is executed. After the oil pump device completes the corresponding test logic, it is confirmed whether the anti-surge valve is completely closed. When the anti-surge valve is completely closed, the dry gas seal inlet valve, loading valve and vent valve of the compressor unit are controlled to open in sequence to complete the preparation for the replacement operation.

[0029] In an embodiment of the present application, the compressor unit also includes an inlet valve connected to the loading valve, and the control method also includes: after completing the third purge operation, closing the outlet bypass valve, closing the vent valve, opening the loading valve, opening the inlet valve, opening the outlet bypass valve, opening the outlet valve, closing the loading valve, and closing the outlet bypass valve in sequence.

[0030] Specifically, after completing the three-stage purge, close the outlet bypass valve and the vent valve in sequence. Open the loading valve, inlet valve, outlet bypass valve and outlet valve, and start pressurizing the pipeline by conveying gas until the pressure of the inlet valve and the outlet valve are the same, and then close the loading valve and the outlet bypass valve. The pipelines where the loading valve and the outlet bypass valve are located are pipelines with slightly smaller apertures, and the pipelines can be slowly pressurized to avoid damage to the inlet valve and the outlet valve under a large pressure difference. Through the above valve opening and closing sequence, the pressure of the inlet valve and the outlet valve can be kept stable, and the preparations for starting the machine are completed.

[0031] In an embodiment of the present application, the compressor unit also includes a frequency converter, and the control method also includes: after closing the outlet bypass valve, performing a secondary confirmation operation for starting the compressor unit, the data confirmed by the secondary confirmation operation include three-out-of-two oil pressures, lubricating oil main pipe pressure, lubricating oil temperature after cooling, anti-surge valve status, inlet valve status, outlet valve status, oil pump device operating status, motor mode, post-isolation gas pressure, outlet bypass valve status, vent valve status, compressor start-up variable status, normal and interlocking shutdown signal status, frequency converter ready status, dry gas seal start-up variable status, drive end and non-drive end air supply flow, drive end support bearing oil inlet flow, non-drive end thrust bearing oil inlet flow, non-drive end support bearing oil inlet flow, dry gas seal heater over-temperature signal variable status, dry gas seal heater comprehensive fault variable status, motor external cooling water system ready status; when the confirmation result of the secondary confirmation operation is qualified, start the frequency converter inversion to perform the compressor unit start-up operation.

[0032] Specifically, the operating status of the oil pump device includes the operating status of the 1# and 3# jacking oil pumps or the operating status of the 2# and 4# jacking oil pumps. In this way, a comprehensive detection of the status of the unit and auxiliary systems can be achieved, reducing the manual judgment link of starting the machine and improving the level of automation. The original one-sided secondary confirmation conditions are adjusted to a comprehensive and automatic retrieval of the status of the unit and auxiliary systems to achieve reliable operation. Automatically judge that the compressor is in the intermediate state from the start of the inverter to the normal operation and define it as an over-step state. At this time, the shaft vibration is greater than that in the normal working state. In order to avoid false triggering of the protection shutdown logic, the high alarm value and high shutdown value of the motor side vibration value when in the over-step state are changed to 1.5 times that of the working state, and the high alarm value and high shutdown value of the compressor side vibration are changed to 1.0 times that of the normal operating state.

[0033] In an embodiment of the present application, the compressor unit includes an external motor cooling system, and the control method also includes: determining the current operating condition of the compressor unit before the oil pump device is started and the corresponding test logic is executed; when the current operating condition is a cold standby state, controlling the working mode of the compressor unit to switch from a cold standby state to a hot standby state, and the working time of the compressor unit from the cold standby state to the hot standby state until the compressor unit starts is less than or equal to a first preset time, so as to start the external motor cooling system; when the current operating condition is a hot standby state, controlling the working mode of the compressor unit to a hot standby state, and the working time of the compressor unit from the hot standby state to the compressor unit starting is less than or equal to a second preset time, so as to start the external motor cooling system, wherein the first preset time is greater than the second preset time.

[0034] Specifically, the current working conditions of the compressor unit include cold standby state and hot standby state. The cold standby state refers to the abnormal temperature of the lubricating oil tank and the abnormal pressure of the rear isolation gas. In the compressor unit, since the cold standby equipment is not in operation, preparatory work such as preheating and commissioning is required before starting. When the current working condition is the cold standby state, the working mode of the compressor unit is controlled to switch from the cold standby state to the hot standby state, and the working time of the compressor unit from the hot standby state to the start of the compressor unit is the first preset time. The hot standby state refers to the state where the rear isolation gas of the compressor unit is put into use and the temperature of the lubricating oil tank is normal and can be started at any time. Specifically, the first preset time can be 360in, and the second preset time can be 100min. If any one of them times out, it is judged as "fault interlock parking", and the startup sequence is automatically exited to switch to the self-start of the unit with a lower priority, and an alarm is generated to trigger the pressure maintenance parking process, prompting the on-duty personnel to deal with it.

[0035] In an embodiment of the present application, the oil pump device includes an emergency oil pump, a main oil pump and a standby oil pump, and controlling the oil pump device to start and execute the corresponding test logic includes: obtaining a sequential control sequence variable corresponding to the start-up instruction; when the sequential control sequence variable is a first preset variable, obtaining a first outlet pressure of the standby emergency oil pump; when the first outlet pressure is less than or equal to a first pressure threshold, controlling the emergency oil pump to start, and obtaining a first operating time when the first outlet pressure is at a first preset pressure; when the first operating time is greater than or equal to the first time threshold, controlling the emergency oil pump to stop running; when the sequential control sequence variable is a second preset variable, sequentially controlling the main oil pump and the standby oil pump to start running; sequentially obtaining a second outlet pressure of the standby oil pump and a third outlet pressure of the main oil pump; when the second outlet pressure is at a second preset pressure and the second operating time is greater than or equal to the second time threshold, controlling the standby oil pump to stop running; when the standby jacking pump stops running for a stop time greater than or equal to the third time threshold, starting the main oil pump; when the third outlet pressure is at a third preset pressure and the third operating time is greater than or equal to the fourth time threshold, determining that the oil pump device successfully completes the test logic.

[0036] In an embodiment of the present application, the compressor unit also includes a main lifting pump and a standby lifting pump, and the control method also includes: after the oil pump device completes the corresponding test logic, before confirming whether the anti-surge valve is completely closed, obtaining the sequential control timing variable corresponding to the start-up instruction; when the sequential control timing variable is a third preset variable, controlling the main lifting pump and the standby lifting pump to start running in sequence; obtaining the fifth outlet pressure of the standby lifting pump and the sixth outlet pressure of the main lifting pump in sequence; when the fourth outlet pressure is at the fourth preset pressure and the fourth operating time is greater than or equal to the fourth time threshold, controlling the standby lifting pump to stop running; when the stop time of the standby lifting pump is greater than or equal to the fifth time threshold, starting the main lifting pump; when the fifth outlet pressure is at the fifth preset pressure and the fifth operating time is greater than or equal to the sixth time threshold, determining that the main lifting pump and the standby lifting pump have successfully completed the corresponding test logic.

[0037] The sequential control sequence variable is used to control the timing of the startup actions of each device of the compressor unit. The first preset variable is the timing variable set for the emergency oil pump. The third preset variable is the timing variable set for the main and standby oil pumps. The third preset variable is the timing variable set for the jacking pump. When the sequential control sequence variable is the first preset variable, the operation of the emergency oil pump, the main oil pump and the standby oil pump is controlled. By obtaining the first outlet pressure of the emergency oil pump, the second outlet pressure of the standby oil pump and the third outlet pressure of the main oil pump, and the corresponding stable operation time, the test logic of the main oil pump and the standby oil pump is executed to verify the integrity of the oil pump and ensure the smooth operation of the unit. When the sequential control sequence variable is the second preset variable, the operation of the main jacking pump and the standby jacking pump is controlled. By obtaining the fourth outlet pressure of the standby jacking pump and the fifth outlet pressure of the main oil pump, the test logic of the main jacking pump and the standby jacking pump is executed to verify the integrity of the jacking pump.

[0038] It can be understood that the first preset pressure is the normal operating pressure set for the first outlet pressure of the accident oil pump. The second preset pressure refers to the normal operating pressure set for the second outlet pressure of the backup oil pump. The third preset pressure is the normal operating pressure set for the third outlet pressure of the main oil pump. When the sequential control sequence variable is the first preset variable, the accident oil pump is started to run. When the first outlet pressure is within the first preset pressure range, the timing starts. The first operating time refers to the operating time during which the first outlet pressure of the accident oil pump continues to be at the first preset pressure. The second operating time refers to the operating time during which the second outlet pressure of the backup oil pump continues to be at the second preset pressure. When the first operating time during which the first outlet pressure continues to be at the first preset pressure is greater than the first time threshold, it can be confirmed that the accident oil pump is normal, and the accident oil pump is controlled to stop running. Further, the sequential control sequence variable corresponding to the start-up instruction is controlled to be obtained, and when the sequential control sequence variable is the second preset variable, the main oil pump and the backup oil pump are controlled to start running in sequence. When the second outlet pressure is within the second preset pressure range, the timing starts. The first operating time refers to the operating time during which the first outlet pressure of the accident oil pump continues to be at the first preset pressure. The second operation duration refers to the operation duration during which the second outlet pressure of the standby oil pump is continuously at the second preset pressure. The third operation duration refers to the operation duration during which the third outlet pressure of the main oil pump is continuously at the third preset pressure. If the second operation duration during which the second outlet pressure is continuously at the second preset pressure is greater than the second duration threshold, the standby oil pump can be confirmed to be normal and the standby oil pump can be controlled to stop running. At this time, the standby oil pump is controlled to stop running. If the stop duration of the standby jacking pump is greater than or equal to the second duration threshold, the main jacking pump is started to run. If the third outlet pressure of the main jacking pump is within the third preset pressure range, the timing is started. If the third operation duration during which the third outlet pressure is continuously within the third preset pressure range is greater than or equal to the fourth duration threshold, it is determined that the oil pump device has successfully completed the test logic. The first duration threshold is set by the technician for the first operation duration based on technical experience, and the second duration threshold is set by the technician for the second operation duration based on technical experience. The third duration threshold is set by the technician for the stop duration of the standby oil pump based on technical experience, and the fourth duration threshold is set by the technician for the third operation duration based on technical experience. The second time threshold can be set to 60s, the third time threshold can be set to 10s, and the fourth time threshold can be set to 60s. By executing the test logic of the main jacking pump and the standby jacking pump, the integrity of the oil pump can be verified to ensure the smooth operation of the unit.

[0039] Similarly, the main lifting pump and the standby lifting pump can be tested according to the test logic of the main and standby lifting pumps to verify the integrity of the main and standby lifting pumps and ensure the smooth operation of the unit.

[0040] In an embodiment of the present application, the oil pump device includes a main lifting pump and a standby lifting pump, and the control method also includes: determining the current operating condition of the compressor unit; when the current operating condition is a hot standby state, determining that the difference between the sixth operating time of the main lifting pump and the seventh operating time of the standby lifting pump is greater than the sixth time threshold, switching the operating modes of the main lifting pump and the standby lifting pump.

[0041] It can be understood that the sixth operating time refers to the operating time of the main lifting pump when the compressor unit is running, and the seventh operating time refers to the operating time of the backup lifting pump when the compressor unit is running. The sixth time threshold refers to the empirical value set by the technician for the difference between the sixth operating time and the seventh operating time. When the oil pump switchable conditions are met, the oil pump is in hot standby state, and the oil pump is in automatic mode, if the difference in operating time between the main and backup pumps is greater than the sixth time threshold, the main and backup oil pumps are swapped. The original backup pump operates as the main pump, and the original main pump operates as the backup pump. By automatically switching the main and backup relationship of the lifting oil pumps, the problem of long-term single operation of the main oil pump is solved.

[0042] In the embodiment of the present application, after receiving the start-up command, the following start-up conditions need to be judged, including but not limited to normal post-isolation gas pressure, normal non-interlocking shutdown signal of the unit, remote control mode of the inverter, no over-temperature signal of the dry gas seal heater, no comprehensive fault of the dry gas seal heater, compressor unit speed ≤5rpm, 3500 system working normally, 1# oil pump control mode in remote, 2# oil pump control mode in remote, emergency oil pump control mode in remote, 1#, 3# lifting pump control mode in remote, 2#, 4# lifting pump control mode in remote, lubricating oil heating The inverter control mode is in remote, the 1# oil cooling fan control mode is in remote, the 2# oil cooling fan control mode is in remote, the exhaust fan control mode is in remote, the main motor heater control mode is in remote, the inverter 10kV circuit breaker is in the open position or the inverter 10kV circuit breaker is kept for 15 minutes (capacitor discharge time) after changing from the closed position to the open position, the 1# oil pump inverter is fault-free, the 2# oil pump inverter is fault-free, the emergency oil pump inverter is fault-free, the 1# and 3# lifting oil pump inverters are fault-free, the 2# and 4# lifting pump inverters are fault-free, the 1# oil cooling inverter is fault-free, and the 2# oil cooling inverter is fault-free. In this way, a comprehensive detection of the status of the unit and auxiliary systems can be achieved, reducing the manual judgment link of starting the machine and improving the level of automation. The original manual judgment that the start button can be triggered only after the start conditions are met is adjusted to triggering the start button first and the program automatically searches whether the start conditions are met to achieve full automatic start.

[0043] In an embodiment of the present application, it also includes optimizing the warm-up time of the unit startup. Specifically, the unit is restarted within 2 hours after shutdown, and the warm-up time is shortened from 40 minutes to 20 minutes, so that the startup efficiency is improved by 30%.

[0044] In the embodiments of the present application, the monitoring logic of the inverter startup process is also optimized, including the development of the normal shutdown, pressure maintenance shutdown, and pressure relief shutdown screen processes of the unit, and the development of the one-key emptying and automatic emptying logic functions and screen processes of the unit, so as to facilitate the operation and maintenance personnel to monitor the operating status of the unit during the startup and shutdown process.

[0045] Through the above technical solutions, the oil pump and key valves are effectively detected, and three-stage purge is added, which improves the reliability of operation. By improving the logical judgment of the start-up conditions and secondary confirmation conditions, the start and stop of the unit and stable operation can be achieved without human intervention, and the work efficiency of on-site personnel is improved. By adding automatic judgment of cold standby and hot standby start-up, and automatically setting the warm-up time according to the cold and hot standby start-up status, the problems of long start-up time, logical redundancy, and low efficiency are solved, and the intelligent control level of the compressor unit is comprehensively improved, the reliability and timeliness of the compressor unit operation are improved, and the work efficiency is improved by more than 50%.

[0046] Figure 2 FIG. 1 is a flow chart of a control method for a compressor unit in one embodiment. It should be understood that although Figure 2 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 2 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0047] In one embodiment, a specific method for sequentially controlling the start-up of a compressor unit is provided. Specifically, the unit cold and hot standby state variables can be set, which can be divided into three states according to the working conditions. The start-up command for the compressor unit sent by the control center is received and the fault signal is automatically reset according to the start-up command. The vent valve and the anti-surge valve are controlled to be closed according to the start-up command, and the unit motor external cooling system is started. After the oil pressure is delayed and waited to drop to a given value, the oil pump device is controlled to start and execute the corresponding test logic. After the oil pump device completes the corresponding test logic, it is confirmed whether the anti-surge valve is completely closed. The dry gas sealing inlet valve of the compressor unit is opened to determine the sealing gas flow rate. When the anti-surge valve is completely closed, the loading valve is controlled to open in sequence, and the compressor is controlled to start the replacement operation of natural gas to perform the first purge operation on the unit casing of the compressor; after the first purge operation is completed, the anti-surge valve is controlled to open to perform the second purge operation on the pipeline corresponding to the anti-surge valve; after the second purge operation is completed, the loading valve is controlled to close, and the outlet bypass valve is controlled to open to control the pipeline corresponding to the outlet valve to perform the third purge operation. After closing the outlet bypass valve, issue a closing command to the inverter. Perform the secondary confirmation operation of the compressor unit startup. The data confirmed by the secondary confirmation operation include the three-out-of-two oil pressure, the lubricating oil main pipe pressure, the lubricating oil temperature after cooling, the compressor anti-surge valve status, the compressor inlet valve status, the compressor outlet valve status, the 1#, 3# jacking oil pump operation status or the 2#, 4# jacking oil pump operation status, the motor mode, the rear isolation gas pressure, the compressor outlet bypass valve status, the compressor ESD vent valve status, the SCS compressor startup variable status, the normal and interlocking stop signal status, the inverter preparation status, the dry gas seal startup variable status, the drive end and non-drive end air supply flow, the drive end support bearing oil flow, the non-drive end thrust bearing oil flow, the non-drive end support bearing oil flow, the dry gas seal heater overtemperature signal variable status, the dry gas seal heater comprehensive fault variable status, and the motor external cooling water system preparation status. If the confirmation result of the secondary confirmation operation is qualified, start the inverter to perform the compressor unit startup operation.

[0048] Specifically, in an embodiment of the present application, the compressor unit also includes a dry gas seal system and a lubricating oil system. The unit's hot and cold standby state variables can be set for the compressor unit, and can be divided into three states according to the working conditions. If there is no reset signal for the unit's cold standby state, the lubricating oil tank temperature of the lubricating oil system is abnormal, or the rear isolation gas pressure of the dry gas seal system is abnormal, then the unit's hot and cold standby state variables = 0. If any of the following conditions is met: triggering the unit's normal shutdown signal, triggering the unit's pressure-maintaining shutdown, triggering the unit's pressure relief shutdown signal, the inverter is not running when the upper computer clicks the sequential reset button, and the compressor unit speed is ≤5rpm, and the unit is in the startup process, then the unit's hot and cold standby state variables = 0. If the startup command of the compressor unit is issued, the variable unit is defined to be interlocked and reset after entering hot standby = 1, maintained for 3S, and the unit's hot and cold standby state variables = 1. If any of the following conditions is met: the unit normal shutdown signal is triggered, the unit pressure maintenance shutdown is triggered, the unit pressure relief shutdown signal is triggered, or the sequence reset is triggered when the unit is not started, the unit is in the startup process, and the rear isolation gas pressure and lubricating oil tank temperature are not normal, then the unit cold standby state reset priority trigger output = 0. If the unit start command is activated, the lubricating oil tank temperature is normal, the rear isolation gas pressure is normal, and the above conditions are met at the same time, it is defined as the unit hot standby start, and the unit cold standby state variable = 2. If the lubricating oil tank temperature is normal and the rear isolation gas pressure is normal, it is more than 4s from the start command, and the above conditions are met at the same time, it is defined as the unit cold standby start, and the unit cold standby state variable = 2. If the lubricating oil tank temperature is normal and the rear isolation gas pressure is normal, it is within 4s from the start command, and the above conditions are met at the same time, it is defined as the unit hot standby start, and the unit cold standby state variable = 2. When the unit is in hot standby start, the compressor unit is in the process of starting for 100 minutes, the compressor unit does not reach the minimum speed, and the above conditions are met at the same time, it is defined as a unit hot standby start failure. When the unit is in cold standby start, the unit is in the process of starting for 360 minutes, the unit does not reach the minimum speed, and the above conditions are met at the same time, it is defined as a unit cold standby start failure.

[0049] Furthermore, it is automatically determined that the compressor is in the intermediate state from the start of the inverter operation to the normal operation and is defined as the over-step state. When in the over-step state, the high alarm value and high shutdown value of the motor side vibration value are changed to 1.5 times that of the working state, and the high alarm value and high shutdown value of the compressor side vibration are changed to 1.0 times that of the normal operating state. The unit operating condition is automatically determined, and the warm-up time and the start-up time are automatically set according to the determination result. The above scheme can realize the thorough purging and replacement of the corresponding pipelines, one-button start of the compressor unit, and automatic setting of the warm-up time, thereby improving the reliability and automation of the operation of the compressor station.

[0050] Figure 3 The schematic diagram of a timing control compressor unit startup according to an embodiment of the present application is schematically shown. Figure 1a and Figure 1b The timing control of compressor unit startup includes the following steps in sequence.

[0051] Step 1: Start the motor external cooling system, stop the 1# oil pump and the 2# oil pump, close the vent valve BDV-0201, and close the anti-surge valve FCV-0201.

[0052] Step 2: Test the emergency oil pump (the oil pressure needs to be less than 0.15MPa to start the pump, and the main pipe oil pressure needs to be ≥0.15MPa and last for 60s).

[0053] Step 3, start the standby oil pump and test it (verify that the oil temperature must be ≥35℃, the oil pressure must be ≥0.25MPa, and it lasts for 60s). After the standby oil pump test is completed, start the 2# oil pump and test it (verify that the oil temperature must be ≥35℃, the oil pressure must be ≥0.25MPa, and it lasts for 60s).

[0054] Step 4: Start the standby jacking oil pump group and test it. After the outlet oil pressure of the jacking pump remains normal for 60 seconds, start the main jacking oil pump group. After the outlet oil pressure of the jacking pump remains normal for 60 seconds, the verification is completed.

[0055] Step 5: Confirm that the anti-surge valve FCV-0201 is in the closed position.

[0056] Step 6. Open the dry gas sealing gas source cut-off valve ESDV-0203 and the dry gas sealing air inlet valve XV-0282. At the same time, measure the flow of the sealing gas on the low-pressure side and the high-pressure side. If the first-level sealing gas flow is low, select >250Nm³ / h and delay for 10s before entering the next step.

[0057] Step 7: Open the loading valve GV-0201 and the vent valve.

[0058] Step 8: During the replacement process, purge the unit casing with a delay of 100 seconds.

[0059] Step 9. Open the anti-surge valve FCV-0201 and purge the anti-surge valve pipeline during the replacement process with a delay of 10 seconds.

[0060] Step 10, close the loading valve GV-0201, open the outlet bypass valve GV-0202, and during the replacement process, purge the outlet valve and outlet check valve pipelines with a delay of 1s.

[0061] Step 11. Close the outlet bypass valve GV-0202 and close the vent valve BDV-0201.

[0062] Step 12. Open the loading valve GV-0201.

[0063] Step 13: Open the inlet valve ESDV-0201 and the outlet bypass valve GV-0202.

[0064] Step 14. Open the outlet valve ESDV-0202.

[0065] Step 15: Close the loading valve GV-0201 and the outlet bypass valve GV-0202.

[0066] Step 16: Send the closing command to the inverter.

[0067] Step 17: Start the inverter.

[0068] Step 18: Increase the speed to 800 rpm.

[0069] Step 19: Warm up the machine.

[0070] Step 20: Increase the speed to 3280 rpm.

[0071] Step 21: Reach the minimum speed.

[0072] Figure 4 The structure block diagram of a control device for a compressor unit according to an embodiment of the present application is schematically shown. Figure 4 As shown, an embodiment of the present application provides a control device for a compressor unit, which may include: Memory 410, configured to store instructions; The processor 420 is configured to call instructions from the memory 410 and implement the above-mentioned control method for the compressor unit when executing the instructions.

[0073] Specifically, in the embodiment of the present application, the processor 420 may be configured to: In an embodiment of the present application, the compressor unit also includes a vent valve, a dry gas seal intake valve and an oil pump device, and the dry gas seal intake valve, the loading valve, the vent valve and the oil pump device are all connected to the compressor, and the control method includes: before controlling the compressor to start the replacement operation, receiving a start-up instruction for the compressor unit sent by the control center; controlling the vent valve and the anti-surge valve to close according to the start-up instruction; controlling the oil pump device to start and execute the corresponding test logic; after the oil pump device completes the corresponding test logic, confirming whether the anti-surge valve is completely closed; when the anti-surge valve is completely closed, sequentially controlling the dry gas seal intake valve, the loading valve and the vent valve to open to complete the preparation for the replacement operation.

[0074] In an embodiment of the present application, the compressor unit further includes an inlet valve connected to the loading valve, and the processor 420 may be configured to: After completing the third purge operation, close the outlet bypass valve, close the vent valve, open the loading valve, open the inlet valve, open the outlet bypass valve, open the outlet valve, close the loading valve, and close the outlet bypass valve in sequence.

[0075] In an embodiment of the present application, the compressor unit further includes a frequency converter, and the processor 420 may be configured as follows: After closing the outlet bypass valve, perform the secondary confirmation operation of starting the compressor unit. The data confirmed by the secondary confirmation operation include the three-out-of-two oil pressure, the lubricating oil main pipe pressure, the lubricating oil temperature after cooling, the anti-surge valve status, the inlet valve status, the outlet valve status, the oil pump device operating status, the motor mode, the post-isolating gas pressure, the outlet bypass valve status, the vent valve status, the variable status of allowing the compressor to start, the normal and interlocking shutdown signal status, the inverter ready status, the dry gas seal allowed startup variable status, the drive end and non-drive end air supply flow, the drive end support bearing oil inlet flow, the non-drive end thrust bearing oil inlet flow, the non-drive end support bearing oil inlet flow, the dry gas seal heater over-temperature signal variable status, the dry gas seal heater comprehensive fault variable status, and the motor external cooling water system ready status; when the confirmation result of the secondary confirmation operation is qualified, start the inverter to perform the compressor unit startup operation.

[0076] In an embodiment of the present application, the compressor unit includes an external motor cooling system, and the processor 420 may be configured to: Before the oil pump device is started and the corresponding test logic is executed, the current operating condition of the compressor unit is determined; when the current operating condition is the cold standby state, the operating mode of the compressor unit is controlled to switch from the cold standby state to the hot standby state, and the working time of the compressor unit from the cold standby state to the hot standby state until the compressor unit starts is less than or equal to the first preset time, so as to start the external cooling system of the motor; when the current operating condition is the hot standby state, the operating mode of the compressor unit is controlled to the hot standby state, and the working time of the compressor unit from the hot standby state to the compressor unit starts is less than or equal to the second preset time, so as to start the external cooling system of the motor, wherein the first preset time is greater than the second preset time.

[0077] In an embodiment of the present application, the oil pump device includes an emergency oil pump, a main oil pump and a standby oil pump, and the processor 420 may be configured as follows: Obtain the sequential control sequence variable corresponding to the start-up instruction; when the sequential control sequence variable is the first preset variable, obtain the first outlet pressure of the emergency oil pump; when the first outlet pressure is less than or equal to the first pressure threshold, control the emergency oil pump to start, and obtain the first operating time when the first outlet pressure is at the first preset pressure; when the first operating time is greater than or equal to the first time threshold, control the emergency oil pump to stop running; when the sequential control sequence variable is the second preset variable, control the main oil pump and the standby oil pump to start running in sequence; obtain the second outlet pressure of the standby oil pump and the third outlet pressure of the main oil pump in sequence; when the second operating time when the second outlet pressure is at the second preset pressure is greater than or equal to the second time threshold, control the standby oil pump to stop running; when the stop time of the standby lifting pump is greater than or equal to the third time threshold, start the main oil pump; when the third operating time when the third outlet pressure is at the third preset pressure is greater than or equal to the fourth time threshold, determine that the oil pump device has successfully completed the test logic.

[0078] In an embodiment of the present application, the compressor unit further includes a main lifting pump and a standby lifting pump, and the processor 420 may be configured as follows: After the oil pump device completes the corresponding test logic, before confirming whether the anti-surge valve is completely closed, obtain the sequential control sequence variable corresponding to the start-up instruction; when the sequential control sequence variable is the third preset variable, control the main jacking pump and the standby jacking pump to start running in sequence; obtain the fifth outlet pressure of the standby jacking pump and the sixth outlet pressure of the main jacking pump in sequence; when the fourth outlet pressure is at the fourth preset pressure and the fourth operating time is greater than or equal to the fourth time threshold, control the standby jacking pump to stop running; when the stop time of the standby jacking pump is greater than or equal to the fifth time threshold, start the main jacking pump; when the fifth outlet pressure is at the fifth preset pressure and the fifth operating time is greater than or equal to the sixth time threshold, determine that the main jacking pump and the standby jacking pump have successfully completed the corresponding test logic. .

[0079] The present application provides a compressor unit, comprising: A compressor, a loading valve, an outlet valve, an outlet bypass valve, and an anti-surge valve, wherein the compressor is connected to the outlet valve and the anti-surge valve respectively, the loading valve is connected to the inlet valve, and the outlet bypass valve is connected to the outlet valve; And a control device for a compressor unit according to the above.

[0080] Specifically, in an embodiment of the present application, the compressor unit includes a main motor, a compressor, an inlet valve, a loading valve, an outlet valve, an outlet bypass valve, an anti-surge valve, a dry gas sealing system, a pipeline, an external cooling of the motor, a lubricating oil system, a frequency converter, a dry gas sealing system, a lubricating oil system, and the above-mentioned control device for the compressor unit. The compressor is respectively connected to the inlet valve, the inlet loading valve, the outlet valve, the outlet bypass valve, and the anti-surge valve; the anti-surge valve is respectively connected to the inlet valve, the loading valve, the outlet valve, and the outlet bypass; the outlet bypass valve is connected in parallel with the outlet valve. An embodiment of the present application also provides a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable a machine to execute the above-mentioned control method for a compressor unit.

[0081] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor A01, a network interface A02, a memory (not shown in the figure) and a database (not shown in the figure) connected through a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02 and a database (not shown in the figure). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A04. The database of the computer device is used to store data for a control method for a compressor unit. The network interface A02 of the computer device is used to communicate with an external terminal through a network connection. When the computer program B02 is executed by the processor A01, a control method for a compressor unit is implemented.

[0082] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0083] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0084] The present application is described with reference to the flowchart and / or block diagram of the method, device (system), and computer program product according to the embodiment of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the process and / or box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate a device for implementing the functions specified in one process or multiple processes in the flowchart and / or one box or multiple boxes in the block diagram.

[0085] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0086] These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0087] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0088] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0089] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0090] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0091] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A control method for a compressor unit, characterized in that: The compressor unit includes a compressor, a loading valve, an outlet valve, an outlet bypass valve, and an anti-surge valve. The compressor is connected to the outlet valve and the anti-surge valve respectively. The anti-surge valve is connected to the loading valve and the outlet valve respectively. The outlet bypass valve is connected in parallel with the outlet valve. The control method includes: Controlling the loading valve to open, and controlling the compressor to start a natural gas replacement operation, so as to perform a first purge operation on the unit casing of the compressor; After completing the first purge operation, controlling the anti-surge valve to open, so as to perform a second purge operation on the pipeline corresponding to the anti-surge valve; After completing the second purge operation, the loading valve is controlled to be closed, and the outlet bypass valve is controlled to be opened, so as to control the pipeline corresponding to the outlet valve to perform a third purge operation.

2. The control method for a compressor unit according to claim 1, characterized in that: The compressor unit further comprises a vent valve, a dry gas seal intake valve and an oil pump device, wherein the dry gas seal intake valve, the loading valve, the vent valve and the oil pump device are all connected to the compressor, and the control method comprises: Before controlling the compressor to start the replacement operation, receiving a start-up instruction for the compressor group sent by the control center; Controlling the vent valve and the anti-surge valve to close according to the startup instruction; Controlling the oil pump device to start and execute corresponding test logic; After the oil pump device completes the corresponding test logic, confirming whether the anti-surge valve is completely closed; When the anti-surge valve is completely closed, the dry gas seal intake valve, the loading valve and the vent valve are controlled to open in sequence to complete the preparation work for the replacement operation.

3. The control method for a compressor unit according to claim 2, characterized in that: The compressor unit further includes an inlet valve connected to the loading valve, and the control method further includes: After completing the third purge operation, the outlet bypass valve is closed in sequence, the vent valve is closed, the loading valve is opened, the inlet valve is opened, the outlet bypass valve is opened, the outlet valve is opened, the loading valve is closed, and the outlet bypass valve is closed.

4. The control method for a compressor unit according to claim 3, characterized in that: The compressor unit further includes a frequency converter, and the control method further includes: After closing the outlet bypass valve, perform a secondary confirmation operation of starting the compressor unit, and the data confirmed by the secondary confirmation operation include three-out-of-two oil pressure, lubricating oil main pipe pressure, lubricating oil temperature after cooling, anti-surge valve status, inlet valve status, outlet valve status, oil pump device operation status, motor mode, post-isolation gas pressure, outlet bypass valve status, vent valve status, compressor startup variable status, normal and interlocking shutdown signal status, inverter ready status, dry gas seal startup variable status, drive end and non-drive end air supply flow, drive end support bearing oil inlet flow, non-drive end thrust bearing oil inlet flow, non-drive end support bearing oil inlet flow, dry gas seal heater overtemperature signal variable status, dry gas seal heater comprehensive fault variable status, motor external cooling water system ready status; When the confirmation result of the secondary confirmation operation is qualified, the inverter is started to perform the startup operation of the compressor unit.

5. The control method for a compressor unit according to claim 2, characterized in that: The compressor unit includes an external motor cooling system, and the control method further includes: Before the oil pump device is started and the corresponding test logic is executed, determining the current working condition of the compressor unit; When the current working condition is a cold standby state, the working mode of the compressor group is controlled to switch from the cold standby state to the hot standby state, and the compressor group switches from the cold standby state to the hot standby state until the working time of the compressor group starting is less than or equal to a first preset time, so as to start the motor external cooling system; When the current operating condition is a hot standby state, the operating mode of the compressor unit is controlled to be a hot standby state, and the operating time of the compressor unit from the hot standby state to the start of the compressor unit is less than or equal to a second preset time to start the external cooling system of the motor, wherein the first preset time is greater than the second preset time.

6. The control method for a compressor unit according to claim 2, characterized in that: The oil pump device includes an emergency oil pump, a main oil pump and a standby oil pump, and the control of starting the oil pump device and executing the corresponding test logic includes: Get the sequence control timing variable corresponding to the startup instruction; When the sequential control time sequence variable is a first preset variable, obtaining a first outlet pressure of the emergency oil pump; When the first outlet pressure is less than or equal to a first pressure threshold, controlling the emergency oil pump to start, and obtaining a first operating time during which the first outlet pressure is at the first preset pressure; When the first operation time is greater than or equal to a first time threshold, controlling the emergency oil pump to stop operating; Obtaining a sequential control timing variable corresponding to the startup instruction; When the sequential control time sequence variable is the second preset variable, the main oil pump and the backup oil pump are sequentially controlled to start and run; sequentially obtaining a second outlet pressure of the backup oil pump and a third outlet pressure of the main oil pump; When the second outlet pressure is at the second preset pressure for a second operation time greater than or equal to a second time threshold, controlling the backup oil pump to stop running; When the standby jacking pump stops running for a period of time greater than or equal to a third period threshold, starting the main oil pump; When the third operating time during which the third outlet pressure is at the third preset pressure is greater than or equal to a fourth time threshold, it is determined that the oil pump device successfully completes the test logic.

7. The control method for a compressor unit according to claim 2, characterized in that: The compressor unit further includes a main lifting pump and a standby lifting pump, and the control method further includes: After the oil pump device completes the corresponding test logic and before confirming whether the anti-surge valve is completely closed, obtaining a sequential control time sequence variable corresponding to the start command; When the sequential control time sequence variable is the third preset variable, the main lifting pump and the standby lifting pump are sequentially controlled to start operation; sequentially obtaining a fifth outlet pressure of the standby lifting pump and a sixth outlet pressure of the main lifting pump; When the fourth outlet pressure is at the fourth preset pressure and the fourth operation time is greater than or equal to the fourth time threshold, controlling the standby lifting pump to stop running; When the standby lifting pump stops running for a period of time greater than or equal to a fifth period threshold, starting the main lifting pump; When the fifth operating time during which the fifth outlet pressure is at the fifth preset pressure is greater than or equal to a sixth time threshold, it is determined that the main lifting pump and the standby lifting pump successfully complete corresponding test logics.

8. A control device for a compressor unit, characterized in that: include: a memory configured to store instructions; A processor is configured to call the instructions from the memory and implement the control method for a compressor group according to any one of claims 1 to 7 when executing the instructions.

9. A compressor unit, characterized in that: It includes a compressor, a loading valve, an outlet valve, an outlet bypass valve, and an anti-surge valve, wherein the compressor is connected to the outlet valve and the anti-surge valve respectively, the loading valve is connected to the inlet valve, and the outlet bypass valve is connected to the outlet valve; And a control device for a compressor unit according to claim 8.

10. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions, which are used to enable a machine to execute the control method for a compressor unit according to any one of claims 1 to 7.

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