A control method and system for a low-pressure gas system under various working conditions

Abstract

The present invention discloses a control method for a low-pressure gas system under various working conditions, which relates to the field of low-pressure gas use, including establishing a virtualized communication operation control logic; monitoring the automation components, and automatically switching between the master and standby modes when the automation components fail; monitoring the air compressor, and automatically switching between the master and standby modes when the air compressor fails. Without changing the existing system equipment, the communication operation and independent operation of the industrial gas and the micro-positive low-pressure gas system are achieved by opening and closing the connecting valve. During the communication operation, the operating cycles of the four air compressors are ensured to be longer, the operating reliability of the low-pressure gas system and the service life of the equipment are improved, the utilization rate of the air compressors is balanced, the operating reliability of the low-pressure gas system is improved, and the probability of failure of the low-pressure gas system due to damage to a certain air compressor is reduced. There are four sensors and four air compressors. In extreme cases, only one sensor or air compressor is left to maintain the normal operation of the gas system, thereby improving the stability and redundancy of the low-pressure gas system.

Description

Technical Field

[0001] The present invention relates to the field of low-pressure gas use, and in particular to a control method and system for a low-pressure gas use system under various working conditions. Background Art

[0002] The hydropower station's low-pressure gas system consists of two separate low-pressure gas systems: industrial gas and micro-positive pressure gas. Each system is equipped with a separate air compressor and gas storage tank. Connecting pipes and connecting valves are installed on the air supply lines of the two gas systems. Under normal circumstances, the connecting valve is normally closed, and the two low-pressure gas systems operate stably independently. However, long-term operation revealed deficiencies in the independent operation of the two low-pressure gas systems: the industrial gas system's pipelines, valves, and gas tanks are well sealed, gas consumption is low, and the air compressor is often kept in standby mode, with an annual operating time of only 24 hours. The closed busbar operation of the units requires continuous inflation, resulting in high gas consumption. The micro-positive pressure gas system is frequently started, with an air compressor operating cycle of approximately 25 minutes and an operating time of approximately 17 minutes. The frequent starts and stops of the air compressors lead to severe wear and tear of components such as the compressor oil, oil cooler, and air intake filter, resulting in a high failure rate and a shortened equipment life.

[0003] In order to improve and balance the utilization rate of air compressors and extend the service life of equipment, this patent conducts research on control methods under two working conditions: independent operation or communication operation of two systems, based on the premise that the existing system equipment remains unchanged, so as to achieve stable and reliable operation of the two gas systems under free switching according to the working conditions. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] In view of the above-mentioned and / or existing problems in a control method of an existing low-pressure gas system under various working conditions, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is: based on the premise that the existing system equipment does not change, research on control methods for two systems under two working conditions: independent operation or communication operation, so as to achieve stable and reliable operation of the two gas systems under free switching of working conditions.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for controlling a low-pressure gas system under multiple working conditions, which includes establishing a virtualized communication operation control logic; monitoring the automation components and automatically switching between the main and standby modes when the automation components fail; monitoring the air compressor and automatically switching between the main and standby modes when the air compressor fails.

[0008] As a preferred solution of the control method of a low-pressure gas system under multiple working conditions described in the present invention, the establishment of virtualized communication operation control includes adding virtualized communication operation control logic without changing the control logic of a single system when operating independently.

[0009] As a preferred solution of the control method of a low-pressure gas system under multiple working conditions described in the present invention, the virtualized communication operation control logic includes: when the system is running independently, judging the state of the connecting valve, and if the connecting valve is not in the fully open state, exiting the current process;

[0010] If the connecting valve is fully open, the system will enter the communication operation mode to determine whether the industrial gas and micro-positive pressure gas networks are connected;

[0011] If there are related fault signals in the industrial gas and micro-positive pressure gas network connections, a signal indicating that the joint control mode conditions are not met will be reported, and the communication operation mode will be exited;

[0012] If there is no fault signal in the industrial gas and micro-positive pressure gas network connections, the micro-positive pressure gas system pressure sensor is used as the primary sensor, and the industrial gas system pressure sensor is used as the backup sensor to determine the micro-positive pressure tank pressure;

[0013] If the pressure in the micro-positive pressure tank drops to the pressure for starting the main air compressor, the micro-positive pressure system will transmit the main air compressor start-up command to the industrial gas system. The micro-positive pressure gas system and the industrial gas system will each start an air compressor. When the pressure rises to the stop pressure of the air compressor, the two systems will stop at the same time.

[0014] If the pressure in the micro-positive pressure tank drops to the pressure for starting the standby air compressor, the micro-positive pressure system will transmit the start-up command of the standby air compressor to the industrial gas system. The micro-positive pressure system and the industrial gas system will each start two air compressors. When the pressure rises to the stop pressure of the air compressor, the two systems will stop at the same time.

[0015] Set the pressure of the main air compressor to 0.64Mpa, the pressure of the standby air compressor to 0.60Mpa, and the pressure of the stopped air compressor to 0.8Mpa;

[0016] The relevant fault signals include network connection interruption, industrial gas PLC failure, and micro-positive pressure gas PLC failure.

[0017] As a preferred solution of the control method of a low-pressure gas system under various working conditions described in the present invention, wherein: the automatic master-slave switching when the automation component fails includes, when entering the communication operation mode, the micro-positive pressure gas system pressure sensor is the main sensor, if the main sensor fails, the industrial gas pressure sensor is the main sensor; if the industrial gas pressure sensor fails, the micro-positive pressure gas system pressure switch is the main sensor; if the micro-positive pressure gas system pressure switch fails, the industrial gas system pressure switch is the main sensor.

[0018] As a preferred solution of the control method of a low-pressure gas system under multiple working conditions described in the present invention, the automatic master-slave switching when the air compressor fails includes, if the communication operation mode is not entered, the two air compressors of the industrial gas system and the micro-positive pressure gas system operate as master and standby to each other, and the two air compressors are started in rotation.

[0019] As a preferred solution of the control method of a low-pressure gas system under multiple working conditions described in the present invention, the automatic master-slave switching when the air compressor fails also includes that if a joint control mode is entered, the four air compressors operate as master and standby to each other, two of which are main and two are standby; if a failure occurs, corresponding adjustments are made according to the number of air compressor failures.

[0020] As a preferred solution of the control method of the low-pressure gas system under various working conditions described in the present invention, when the pressure switch of the micro-positive pressure gas system fails and the pressure switch of the industrial gas system is the main sensor, the normal start and stop and main-standby switching of the air compressor will not be affected; if all automation components fail, the air compressor will not receive the start and stop signals, the system will automatically alarm a serious fault, and maintenance personnel will check it;

[0021] The failure of the air compressor does not affect the main selection of the automation components. If all four air compressors fail, the air compressors will not be able to operate after receiving the start and stop signals. The system will automatically alarm for a serious fault and require maintenance personnel to check.

[0022] Another object of the present invention is to provide a system for controlling a low-pressure gas system under various working conditions, which can operate the control system under two working conditions independently or in communication through two sets of systems, thereby solving the problem of frequent start and stop of the air compressor during the independent operation of the two existing low-pressure gas systems, resulting in serious loss of air compressor oil, air oil cooler, air intake filter and other accessories, high air compressor failure rate, and shortened equipment service life.

[0023] As a preferred solution for controlling the low-pressure gas system under various working conditions described in the present invention, it includes: a PLC module, a data recording module, a display module, and an alarm module; the PLC module includes an independent PLC that becomes a virtual master / slave PLC through a network connection to achieve data interaction, and realizes data communication between PLCs with different IP addresses in the same network segment through specific functional blocks without changing the communication structure; the data recording module is used to record the system operating status and parameter information for subsequent analysis and troubleshooting; the display module is used to monitor the system status in real time, and provide an operation interface for system configuration and parameter setting; the alarm module is used to prompt the operator of system failures or abnormal conditions.

[0024] A computer device includes a memory and a processor, wherein the memory stores a computer program, and is characterized in that the processor implements the steps of the above method when executing the computer program.

[0025] A computer-readable storage medium stores a computer program thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0026] The beneficial effect of the present invention is that, without changing the existing system equipment, the interconnected operation and independent operation of industrial gas and the micro-positive low-pressure gas system can be achieved by opening and closing the connecting valve. During interconnected operation, the operating cycles of the four air compressors are ensured to be longer, and the operating time and number of times are kept consistent, thereby improving the operational reliability of the low-pressure gas system and the service life of the equipment. The interconnected operation of industrial gas and the micro-positive low-pressure gas system balances the utilization rate of the air compressors, improves the operational reliability of the low-pressure gas system, and reduces the probability of failure of the low-pressure gas system due to damage to a certain air compressor. Under interconnected operation conditions, there are four sensors and four air compressors. In extreme cases, only one sensor or air compressor is left to maintain the normal operation of the gas system, thereby improving the stability and redundancy of the low-pressure gas system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0028] Figure 1 This is a flow chart of a control method for a low-pressure gas system under various working conditions in Example 1.

[0029] Figure 2 This is a structural diagram of the control system of a low-pressure gas system in Example 2 under various working conditions.

[0030] Figure 3 This is a diagram of the newly added DTM communication equipment for a control method and system for a low-pressure gas system under various working conditions in Example 3.

[0031] Figure 4 This is a diagram of entering a newly created DTM communication device for a control method and system for a low-pressure gas system under various working conditions in Example 3.

[0032] Figure 5 This is a newly added communication request diagram for a control method and system for a low-pressure gas system under multiple working conditions in Example 3.

[0033] Figure 6 This is a customized project diagram of a control method and system for a low-pressure gas system under various working conditions in Example 3.

[0034] Figure 7 This is a wzy variable diagram for checking a control method and system for a low-pressure gas system under various working conditions in Example 3.

[0035] Figure 8 This is a newly added BOOL variable diagram of a control method and system for a low-pressure gas system under various working conditions in Example 3.

[0036] Figure 9 This is a newly added program segment diagram of a control method and system for a low-pressure gas system under various working conditions in Example 3.

[0037] Figure 10 This is a modified pump start logic diagram of a control method and system for a low-pressure gas system under various working conditions in Example 3. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0041] Example 1

[0042] Reference Figure 1 , which is the first embodiment of the present invention, provides a control method for a low-pressure gas system under various working conditions, including establishing a virtualized communication operation control logic; monitoring the automation components and automatically switching between the main and standby modes when the automation components fail; and monitoring the air compressor and automatically switching between the main and standby modes when the air compressor fails.

[0043] Without changing the control logic of a single system running independently, a new virtualized communication operation control logic is added. The detailed execution steps of the control logic are as follows:

[0044] S1. When the system is running independently, the status of the connecting valve is judged. If the connecting valve is not in the fully open state, the current process is exited; if the connecting valve is fully open, the system enters the communication operation mode and enters S2.

[0045] S2. Determine whether the industrial gas and slightly positive pressure gas network connections are normal. If there is a related fault signal, proceed to S3; if there is no fault signal, proceed to S4.

[0046] S3: Report a signal indicating that the conditions for the joint control mode are not met, and exit the joint operation mode.

[0047] S4: The micro-positive pressure gas system pressure sensor is the main sensor, and the industrial gas system pressure sensor is the backup sensor. When the pressure of the micro-positive pressure gas tank drops to the pressure to start the main air compressor, it enters S5. When the pressure of the micro-positive pressure gas tank drops to the pressure to start the backup air compressor, it enters S6.

[0048] The main function of the micro-positive pressure gas system is to fill compressed air into the closed busbar barrel, so that the air pressure in the busbar barrel is always maintained in a micro-positive pressure state, preventing the outside air containing moisture and dust from entering the closed busbar barrel, and avoiding abnormal phenomena such as busbar insulation degradation, flash burning, and hydrogen leakage; industrial gas is mainly used for technical water supply, water collection wells and drainage corridors, pneumatic tool gas and purging gas. Both systems use screw air compressors with a rated pressure of 0.80Mpa. Considering that the functional requirements of the gas-using equipment are greater than atmospheric pressure, and the pressure can blow the silt at the bottom of the well; at the same time, ensure that the system pressure is within a certain range to avoid frequent start and stop of the air compressor; based on these three factors of the air compressor rated pressure, the normal pressure working range of the micro-positive pressure system and the industrial gas system is selected to be 0.64Mpa-0.80Mpa. When the gas consumption increases at a certain moment and the pressure drops too fast, multiple air compressors are started at the same time to restore the pressure to normal. Therefore, the program sets the pressure of the main air compressor to 0.64Mpa, the pressure of the standby air compressor to 0.60Mpa, and the pressure of the stopped air compressor to 0.80Mpa;

[0049] S5: The micro-positive pressure system transmits the command to start the main air compressor to the industrial gas system. The micro-positive pressure system and the industrial gas system each start an air compressor. When the pressure rises to the stop pressure of the air compressor, the two systems stop at the same time.

[0050] S6: The micro-positive pressure system transmits the command to start the standby air compressor to the industrial gas system. The micro-positive pressure system and the industrial gas system each start two air compressors. When the pressure rises to the air compressor stop pressure, the two systems stop at the same time.

[0051] When an automation component fails, the master / slave switchover is automatically realized. The detailed execution steps of the control logic are as follows:

[0052] When entering the communication operation mode, the micro-positive pressure gas system pressure sensor is used as the main sensor. When the main sensor fails, proceed to the following steps.

[0053] The industrial gas pressure sensor is used as the main sensor. When the industrial gas pressure sensor fails, proceed to the following steps.

[0054] The micro-positive pressure gas system pressure switch is used as the main sensor. When the micro-positive pressure gas system pressure switch fails, proceed to the following steps.

[0055] The main sensor is the pressure switch of industrial gas system.

[0056] When the air compressor fails, the main and standby switches are automatically realized. The detailed execution arrangement of the control logic is as follows:

[0057] When not in linked operation mode, the industrial gas system and the micro-positive pressure air system air compressors operate in a master-slave relationship, with the two air compressors starting in rotation. When entering joint control mode, proceed to the following steps.

[0058] The four air compressors operate in a master-slave relationship, with two being the main unit and two being the backup units. If a failure occurs, adjustments will be made based on the number of air compressor failures. When one air compressor fails, proceed to the following steps.

[0059] The three air compressors operate in a master-slave relationship, with two in primary use and one in backup. If one air compressor fails, proceed to the following steps.

[0060] The two air compressors operate as master and backup for each other, with one being the main unit and the other being the backup unit. When one of the air compressors fails, proceed to the following steps.

[0061] One air compressor operates independently.

[0062] If the pressure switch of the micro-positive pressure gas system fails and the pressure switch of the industrial gas system is the main sensor, it will not affect the normal start and stop and main-standby switching of the air compressor; if all the automation components fail, the air compressor cannot receive the start and stop signals, and the system automatically alarms a serious fault, which will be checked by maintenance personnel.

[0063] The failure of the air compressor does not affect the main selection of the automation components. If all four air compressors fail, the air compressors will not be able to operate after receiving the start and stop signals. The system will automatically alarm for a serious fault and require maintenance personnel to check.

[0064] Without changing existing system equipment, this patented system enables both interconnected and independent operation of the industrial gas and slightly positive low-pressure gas systems by opening and closing the connecting valve. During interconnected operation, the operating cycles of the four air compressors are extended, maintaining consistent operating time and frequency, thereby improving the reliability of the low-pressure gas system and the lifespan of the equipment.

[0065] The coordinated operation of industrial gas and slightly positive low-pressure gas systems balances the utilization of air compressors, improves the operational reliability of the low-pressure gas system, and reduces the probability of failure of the low-pressure gas system due to damage to a certain air compressor.

[0066] In the case of interconnected operation, there are four sensors and four air compressors. In extreme cases, only one sensor or air compressor can maintain the normal operation of the gas system, which improves the stability and redundancy of the low-pressure gas system.

[0067] Example 2

[0068] Reference Figure 2 , which is the second embodiment of the present invention, is different from the first embodiment in that: this embodiment provides a control system for a low-pressure gas system under various working conditions, and also includes a PLC module, a data recording module, a display module, and an alarm module.

[0069] The PLC module includes independent PLCs that become virtual master and standby PLCs through network connections to achieve data interaction. The PLC uses Schneider M580 series PLCs, which realize data communication between PLCs with different IP addresses in the same network segment through specific function blocks without changing the communication structure.

[0070] The data recording module is used to record the system operating status and parameter information for subsequent analysis and troubleshooting.

[0071] The display module is used to monitor the system status in real time and provide an operation interface for system configuration and parameter setting.

[0072] The alarm module is used to inform the operator of system failures or abnormal conditions.

[0073] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0074] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0075] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0076] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0077] Example 3

[0078] Reference Figure 3-10 , which is the third embodiment of the present invention, differs from the first two embodiments in that:

[0079] Step 1: Add a new DTM communication device in the industrial gas low-pressure gas system PLC. Open "Tools" - "DTM Browser" in the menu bar, select the NOC module, right-click to open the menu bar, click "Add", select Modbus Device, click Add DTM, and add a new DTM communication device, such as Figure 3 shown.

[0080] Step 2: Double-click to open the NOC control module, click Configure Service, and the newly created device will appear under the device list, such as Figure 4 shown.

[0081] Step 3: In the address setting, change the address to the micro-positive low-pressure gas system communication system and click Apply. Open the request setting window, click "Add Request" to add a communication request, change the "Repeat Rate" in the first line of the request to 100, the read address to 400, the read length to 1, keep other parameters as default, and click Apply. Figure 5 shown.

[0082] Step 4: Click "Request 001: Project" under the device on the left to enter the "Input" window on the right, select all projects in the list, click "Customize Project", the project definition is as shown below, the project name is di, click "Confirm" - "Apply" after the settings are completed, as shown below. Figure 6 shown.

[0083] Step 5: After the modification is completed, click Save. Under Variables and FB Instances, click Device DDT Variables to check that the wzy variable has been generated. There is an INT type di point under Inputs, such as Figure 7 shown.

[0084] Step 6: Create new variables Need_One_Pump_start_temp, Need_One_Pump_start_wzy, Need_Two_pumps_start_temp, Need_Two_pumps_start_wzy under Basic Variables, and select BOOL as the variable type. Modify the comment of DI32 to "Connecting valve fully open". In the Program-Logic-Control Logic block, replace Need_One_Pump_start and Need_Two_Pumps_start in FBI_19 with Need_One_Pump_start_temp and Need_Two_Pumps_start_temp, as shown in the following example: Figure 8 .

[0085] Step 7: Add a new program segment and use the INT_TO_BIT function block to convert the INT type wzy.Inputs.di into a BOOL type variable, such as Figure 9 As shown, then modify the pump start logic as follows Figure 10 shown.

[0086] The procedure for modifying the slight positive pressure is consistent with that for industrial gas.

[0087] The hydropower station's low-pressure gas system is equipped with two low-pressure gas systems, one for industrial gas and the other for micro-positive pressure gas. Each gas system is equipped with a separate air compressor and gas storage tank. Connecting pipes and connecting valves are installed on the air supply pipelines of the two gas systems. Under normal circumstances, the connecting valve is in a normally closed state, and the two low-pressure gas systems operate stably independently. Through long-term operation, it was found that there are deficiencies in the independent operation of the two low-pressure gas systems: the industrial gas system pipelines, valves and gas tanks are well sealed, the gas consumption is relatively small, and the air compressor is in a state of shutdown standby for a long time; the closed busbar operation of the unit requires continuous inflation and consumes a large amount of gas, the micro-positive pressure gas system is frequently started, and the frequent start and stop of the air compressor leads to serious wear and tear of accessories such as the air compressor oil, oil cooler, and air intake filter, a high failure rate of the air compressor, and a shortened equipment life.

[0088] In order to improve and balance the utilization rate of air compressors and extend the service life of equipment, this patent conducts research on control methods under two working conditions: independent operation or communication operation of two systems, based on the premise that the existing system equipment remains unchanged, so as to achieve stable and reliable operation of the two gas systems under free switching according to the working conditions.

[0089] This embodiment uses the traditional method and our invented method to run simultaneously, and the detection comparison results are shown in the following table:

[0090] Table 1 Comparison between traditional method and our invented method

[0091] Judgment Category Traditional methods Our invention method Industrial gas operation cycle 34h 20h Industrial gas operating time 2min 6min Micro positive pressure operation cycle 17min 20h Micro positive pressure operation time 25min 6min Failure rate 3％ 0.6％ Service life 7 years 10 years

[0092] From the above comparison results, it can be seen that the industrial gas operation cycle of the method of the present invention is 20 hours, which is 14 hours less than the 34 hours of the traditional method; the industrial gas operation time of the method of the present invention is 6 minutes, which is 4 minutes longer than the 2 minutes of the traditional method; the micro-positive pressure operation cycle of the method of the present invention is 20 hours, which is 1183 minutes longer than the 17 minutes of the traditional method; the micro-positive pressure operation time of the method of the present invention is 6 minutes, which is 4.19 minutes shorter than the 25 minutes of the traditional method; the failure rate of the method of the present invention is 0.6%, which is 2.4% lower than the failure rate of 3% of the traditional method; the service life of the method of the present invention is 10 years, which is 3 years longer than the 7 years of the traditional method.

[0093] The method we invented ensures that the operating cycles of the four air compressors are extended during coordinated operation, and the operating time and frequency are kept consistent, thereby improving the operating reliability of the low-pressure gas system and the service life of the equipment.

[0094] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for controlling a low-pressure gas system under various working conditions, characterized by: include, Establish virtualized communication operation control logic; Monitor automation components and automatically switch between active and standby mode when an automation component fails; Monitor the air compressor and automatically switch between the main and standby modes when the air compressor fails; The establishment of the virtualized communication operation control logic includes adding the virtualized communication operation control logic without changing the control logic of the individual systems when they are independently operated; The virtualized communication operation control logic includes: when the system is running independently, judging the status of the communication valve, and if the communication valve is not in the fully open state, exiting the current process; If the connecting valve is fully open, the system will enter the communication operation mode to determine whether the industrial gas and micro-positive pressure gas networks are connected; If there are related fault signals in the industrial gas and micro-positive pressure gas network connections, a signal indicating that the joint control mode conditions are not met will be reported, and the communication operation mode will be exited; If there is no fault signal in the industrial gas and micro-positive pressure gas network connections, the micro-positive pressure gas system pressure sensor is used as the primary sensor, and the industrial gas system pressure sensor is used as the backup sensor to determine the micro-positive pressure tank pressure; If the pressure in the micro-positive pressure tank drops to the pressure for starting the main air compressor, the micro-positive pressure system will transmit the main air compressor start-up command to the industrial gas system. The micro-positive pressure gas system and the industrial gas system will each start an air compressor. When the pressure rises to the stop pressure of the air compressor, the two systems will stop at the same time. If the pressure in the micro-positive pressure tank drops to the standby air compressor start-up pressure, the micro-positive pressure system will transmit the standby air compressor start-up command to the industrial gas system. The micro-positive pressure gas system and the industrial gas system will each start two air compressors. When the pressure rises to the air compressor stop pressure, the two systems will stop at the same time. Set the pressure of the main air compressor to 0.64Mpa, the pressure of the standby air compressor to 0.60Mpa, and the pressure of the stopped air compressor to 0.8Mpa; The relevant fault signals include network connection interruption, industrial gas PLC fault, and micro-positive pressure gas PLC fault; The automation components include pressure sensors and pressure switches; The automatic master-slave switching when the automation component fails includes: when entering the communication operation mode, the micro-positive pressure gas system pressure sensor is used as the main sensor; if the main sensor fails, the industrial gas pressure sensor is used as the main sensor; if the industrial gas pressure sensor fails, the micro-positive pressure gas system pressure switch is used as the main sensor; if the micro-positive pressure gas system pressure switch fails, the industrial gas system pressure switch is used as the main sensor.

2. A method for controlling a low-pressure gas system under multiple working conditions according to claim 1, characterized in that: The automatic master-slave switching when the air compressor fails includes, if the communication operation mode is not entered, the two air compressors of the industrial gas system and the micro-positive pressure gas system operate as master and standby to each other, and the two air compressors are started in rotation.

3. A method for controlling a low-pressure gas system under multiple working conditions according to claim 2, characterized in that: The automatic master-slave switching when the air compressor fails also includes that, if entering the joint control mode, the four air compressors operate as master and standby to each other, with two being the main and two being the standby; if a failure occurs, corresponding adjustments are made according to the number of air compressor failures.

4. A method for controlling a low-pressure gas system under multiple working conditions according to claim 3, characterized in that: The automation component failure includes a failure of the pressure switch of the micro-positive pressure gas system. When the pressure switch of the industrial gas system is the main sensor, it will not affect the normal start and stop and main-standby switching of the air compressor. If all automation components fail, the air compressor will not receive the start and stop signals, and the system will automatically alarm a serious fault, which will be checked by maintenance personnel. The air compressor failure includes that the failure of the air compressor does not affect the main selection of the automation component. If all four air compressors fail, the air compressor cannot run after receiving the start and stop signals, and the system automatically alarms a serious fault and is checked by maintenance personnel.

5. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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