Compressed air flow control method and device and air lifting system

Abstract

The invention discloses a compressed air flow control method and device and an air lifting system, and belongs to the technical field of radioactive fluid conveying. The control method comprises the steps of receiving a start instruction or a stop instruction; according to the starting instruction, starting signals are sent to an electromagnetic switch valve and an electromagnetic regulating valve at the same time so as to start compressed air supply, and the electromagnetic switch valve and the electromagnetic regulating valve are connected to a pipeline for conveying compressed air in series; and according to the stop instruction, a closing signal is sent to the electromagnetic switch valve and the electromagnetic adjusting valve at the same time so as to block compressed air supply. The control method can solve the problems of short service life of the electromagnetic valve and overshoot conveying of the radioactive feed liquid in the prior art.

Description

Technical Field

[0001] The present invention belongs to the technical field of radioactive fluid transportation, and in particular relates to a method and device for controlling compressed air flow, and an air lifting system. Background Art

[0002] The spent fuel assemblies treated in the spent fuel reprocessing project are highly radioactive, and the liquid generated during the treatment process is highly corrosive and radioactive. The transportation equipment may cause radioactivity to spread during maintenance and replacement, causing maintenance personnel to suffer high-dose radiation exposure and seriously affecting the safety of the surrounding environment. Therefore, higher requirements are placed on the safety and reliability of the transportation equipment.

[0003] Currently, air lift systems are widely used in spent fuel reprocessing projects. Air lift systems have a simple structure and no moving parts, making them suitable for transporting radioactive liquids. The compressed air system is controlled by a pneumatic switch valve to enable the operation and shutdown of the air lift system. The self-adjustment control (automatic feedback adjustment mechanism) of the gas flow meter and regulating valve ensures the stability of the compressed air flow.

[0004] The regulating valve in existing air lift systems only regulates the compressed air flow rate, while the pneumatic on-off valve serves only as a switch. The control processes for the two are independent, leading to the following problems: When the air lift system is not operating, the pneumatic on-off valve is closed. However, due to the self-regulating relationship between the gas flowmeter and the regulating valve, the regulating valve remains fully open. This, on the one hand, causes damage to the solenoid valve if it is fully energized for extended periods, impacting the normal operation of the air lift system. On the other hand, when the air lift system is restarted, once the pneumatic on-off valve is opened, the regulating valve adjusts from full opening toward the target flow rate, causing an initial excessive compressed air flow rate. This can lead to overshoot in the delivery of radioactive liquid, resulting in spillage and radioactive contamination. Consequently, the automation and intelligent operation of compressed air flow control in existing air lift systems at spent fuel reprocessing plants is low. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the existing technology and provide a method, device and air lifting system for controlling compressed air flow, which can extend the service life of the solenoid valve, avoid the overshoot phenomenon of radioactive liquid transportation, and realize the automation and intelligent operation level of the air lifting system.

[0006] In a first aspect, the present invention provides a method for controlling compressed air flow, comprising: receiving a start instruction or a stop instruction; according to the start instruction, sending an open signal to the electromagnetic switch valve and the electromagnetic regulating valve at the same time to start the compressed air supply, wherein the electromagnetic switch valve and the electromagnetic regulating valve are connected in series on a pipeline for conveying compressed air; according to the stop instruction, sending a close signal to the electromagnetic switch valve and the electromagnetic regulating valve at the same time to block the compressed air supply.

[0007] In some embodiments, after sending an opening signal to the electromagnetic switch valve and the electromagnetic regulating valve at the same time according to the start-up instruction, the method for controlling the compressed air flow also includes: obtaining the flow detection value in real time; judging the size of the flow detection value and the target flow value; in response to the flow detection value being less than the target flow value, increasing the control opening of the electromagnetic regulating valve; in response to the flow detection value being equal to the target flow value, controlling the electromagnetic switch valve to maintain the current control opening; in response to the flow detection value being greater than the target flow value, reducing the control opening of the electromagnetic regulating valve.

[0008] In some embodiments, the method for controlling the compressed air flow rate further includes: determining whether there is a pressure detection anomaly, a solenoid control valve failure, or a solenoid switch valve failure, and issuing a corresponding fault alarm.

[0009] In some embodiments, determining whether there is a pressure detection anomaly and issuing a corresponding fault alarm specifically includes: obtaining the gas source pressure detection value in real time; calculating the absolute value of the error between the pressure detection value and the preset pressure value; in response to the absolute value of the error between the pressure detection value and the preset pressure value being greater than a first preset threshold, issuing a pressure detection anomaly alarm and controlling the safety interlock to stop the vehicle.

[0010] In some embodiments, determining whether a solenoid control valve fault exists and issuing a corresponding fault alarm specifically includes: obtaining the actual opening of the solenoid control valve in real time; determining an overshoot based on the actual opening and the controlled opening; and, in response to the overshoot being greater than a second preset threshold, issuing a solenoid control valve fault alarm and controlling a safety interlock stop. Alternatively, obtaining the actual response time of the solenoid control valve in real time; calculating the absolute value of the error between the actual response time and a preset time; and, in response to the absolute value of the error between the actual response time and the preset time being greater than a third preset threshold, issuing a solenoid control valve fault alarm and controlling a safety interlock stop.

[0011] In some embodiments, determining whether there is a solenoid switch valve fault and issuing a corresponding fault alarm specifically includes: obtaining the open position signal and the closed position signal of the solenoid switch valve in real time; in response to the open position signal and the closed position information being true at the same time, or the open position signal and the closed position information being false at the same time, issuing a solenoid switch valve fault alarm and controlling the safety interlock to stop the vehicle.

[0012] In a second aspect, the present invention further provides a device for controlling compressed air flow, which applies the method for controlling compressed air flow in the first aspect. The control device includes an electromagnetic switch valve, an electromagnetic regulating valve, and a control module.

[0013] The control module is electrically connected to the electromagnetic switch valve and the electromagnetic regulating valve, which are connected in series to a pipeline for conveying compressed air. The control module is configured to receive a start command or a stop command, and, in response to the start command, simultaneously send an open signal to the electromagnetic switch valve and the electromagnetic regulating valve to start the compressed air supply, and, in response to the stop command, simultaneously send a close signal to the electromagnetic switch valve and the electromagnetic regulating valve to block the compressed air supply.

[0014] In some embodiments, the compressed air flow control device further includes a pressure gauge and a flow meter. The pressure gauge is connected to the control module and is used to detect the air source pressure in the pipeline to obtain an air source pressure detection value. The flow meter is connected to the control module and is used to detect the flow rate of the compression control to obtain a flow detection value.

[0015] In some embodiments, the compressed air flow control device further comprises a bus connected to the control module, the pressure gauge, and the flow meter.

[0016] In a third aspect, the present invention further provides an air lift system comprising an air lift base section, a feed trough, a gas-liquid separator tank, a receiving tank, and the compressed air flow control device of the second aspect. The compressed air flow control device and the feed trough are respectively connected to the input end of the air lift base section, the output end of the air lift base section is connected to the input end of the gas-liquid separator tank, and the liquid output end of the gas-liquid separator tank is connected to the receiving tank.

[0017] The compressed air flow control method, device, and air lift system provided by the present invention simultaneously send a closing signal to the electromagnetic switch valve and the electromagnetic control valve based on a stop instruction to block the compressed air supply, so that when the air lift system is not operating, the electromagnetic control valve is in a closed state, that is, a zero-opening state. Furthermore, upon the next startup, by simultaneously sending an opening signal to the electromagnetic switch valve and the electromagnetic control valve, the electromagnetic control valve is adjusted from a zero-opening state to a target flow opening, thereby avoiding overshoot in the delivery of radioactive liquid and achieving an automated and intelligent level of operation for the air lift system. Since the electromagnetic control valve does not need to maintain its regulating function when the air lift system is not operating, the power supply to the electromagnetic control valve can be turned off to prevent the electromagnetic valve from being energized for a long time, thereby extending the service life of the control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a flow chart of a method for controlling compressed air flow according to embodiment 1 of the present invention;

[0019] Figure 2This is a schematic diagram of a startup logic flow of Example 1 of the present invention;

[0020] Figure 3 This is a flowchart of a stop logic according to embodiment 1 of the present invention;

[0021] Figure 4 This is a flow chart of a safety interlock logic according to embodiment 1 of the present invention;

[0022] Figure 5(a) is a flow output curve in the related art;

[0023] FIG5( b ) is a flow output curve of Example 1 of the present invention;

[0024] Figure 6 This is a schematic structural diagram of a device for controlling compressed air flow in an air lift system according to embodiment 2 of the present invention;

[0025] Figure 7 This is a signal interaction diagram between a compressed air flow control device and a DCS (Distributed Control System) according to Example 2 of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0027] It should be understood that the specific embodiments and drawings described herein are only used to explain the present invention rather than to limit the present invention.

[0028] It is understood that, in the absence of conflict, the various embodiments of the present invention and the various features in the embodiments may be combined with each other.

[0029] It can be understood that, for the convenience of description, the drawings of the present invention only show parts related to the present invention, while parts unrelated to the present invention are not shown in the drawings.

[0030] It can be understood that each unit and module involved in the embodiments of the present invention may correspond to only one physical structure, or may be composed of multiple physical structures, or multiple units and modules may be integrated into one physical structure.

[0031] It will be understood that, without conflict, the functions and steps marked in the flowcharts and block diagrams of the present invention may occur in an order different from that marked in the drawings.

[0032] It is understood that the flowcharts and block diagrams of the present invention illustrate the possible architectures, functions, and operations of the systems, devices, equipment, and methods according to various embodiments of the present invention. Each box in the flowchart or block diagram may represent a unit, module, program segment, or code, which contains executable instructions for implementing the specified functions. Moreover, each box or combination of boxes in the block diagram and flowchart may be implemented using a hardware-based system that implements the specified functions, or may be implemented using a combination of hardware and computer instructions.

[0033] It can be understood that the units and modules involved in the embodiments of the present invention can be implemented by software or hardware. For example, the units and modules can be located in a processor.

[0034] Example 1:

[0035] In some related technologies, the self-regulating relationship between the regulating valve and the gas flow meter of the air lifting system is manifested in the following: when the air lifting system stops (that is, the pneumatic switch valve is in the closed state), the gas flow meter detects that the flow is zero, and the regulating valve will continue to increase its opening until it is fully open (full opening state) in order to achieve the target flow (which cannot be achieved at this time). As a result, in the initial time period of the operation of the air lifting system, the initial compressed air flow is too large, and then the radioactive liquid delivery overshoot phenomenon occurs; and the solenoid valve is energized and operated at full opening for a long time, resulting in overheating or mechanical wear, shortening the service life.

[0036] To address the aforementioned issues, this embodiment provides a method for controlling compressed air flow, suitable for scenarios requiring precise control of compressed air flow, particularly in air lift systems in post-processing plants. The method is implemented by a compressed air flow control device, which can be a controller, server, or other intelligent terminal.

[0037] like Figure 1 As shown, the method for controlling the compressed air flow includes:

[0038] Step 101: Receive a start instruction or a stop instruction.

[0039] Step 102A: According to the start instruction, an opening signal is simultaneously sent to the electromagnetic switch valve and the electromagnetic regulating valve to start the compressed air supply, wherein the electromagnetic switch valve and the electromagnetic regulating valve are connected in series to the pipeline for conveying compressed air.

[0040] Step 102B: According to the stop instruction, a closing signal is simultaneously sent to the electromagnetic switch valve and the electromagnetic regulating valve to block the compressed air supply.

[0041] In this embodiment, receiving a start or stop command includes receiving a start or stop command from a DCS, or receiving a start or stop command from a local terminal user of the air lift system. A local terminal user refers to a person directly operating the air lift system equipment on-site or at a nearby control point (not a remote DCS operator). Local terminals include smart terminals, nearby control cabinets, etc. The start or stop command is used to start or stop the air lift system, and can also be used to start or stop the compressed air flow control device. After the solenoid switch valve and the solenoid control valve simultaneously receive the open signal, the solenoid switch valve opens to its full position. The solenoid control valve can open from 0 opening to a target flow opening at a preset rate, which can be set according to demand. The simultaneous opening of the solenoid switch valve and the solenoid control valve ensures compressed air supply while preventing initial flow overshoot. Because the close signal is simultaneously sent to the solenoid switch valve and the solenoid control valve in response to the stop command, both the solenoid switch valve and the solenoid control valve are closed when the air lift system stops operating, facilitating a gradual increase in compressed air flow upon the next start-up, preventing overshoot. Therefore, the control method of this embodiment enables automatic interlocking control of compressed air flow and the electromagnetic on-off valve. Because the electromagnetic regulating valve and the electromagnetic on-off valve open and close simultaneously, radioactive spillage caused by overshoot of the medium flow is avoided, thereby improving the safety and automation level of the air lift system. It also prevents the solenoid valve from being energized for a long time, thereby extending the service life of the regulating valve. Furthermore, the use of electromagnetic on-off valves instead of pneumatic on-off valves better meets the requirements of scenarios such as post-processing plant air lift systems, which require fast response, simplified systems, and high-precision control. For example, the electromagnetic on-off valve combined with bus communication can achieve distributed control of the post-processing plant.

[0042] In some embodiments, taking the compressed air flow control device as an example, when the compressed air flow control device is not in use or stopped, the electromagnetic switch valve is in the closed state, the electromagnetic regulating valve is in the fully closed state, and the opening is 0. When starting to use the control device, the operator needs to give it a start instruction and set the target flow value on the DCS. The start logic flow is as follows Figure 2 When the control device needs to be stopped, the operator needs to give it a stop command on the DCS. The stop logic flow is as follows: Figure 3 shown.

[0043] In some embodiments, after sending an opening signal to the electromagnetic switch valve and the electromagnetic regulating valve at the same time according to the start-up instruction, the method for controlling the compressed air flow also includes: obtaining the flow detection value in real time; judging the size of the flow detection value and the target flow value; in response to the flow detection value being less than the target flow value, increasing the control opening of the electromagnetic regulating valve; in response to the flow detection value being equal to the target flow value, controlling the electromagnetic regulating valve to maintain the current control opening; in response to the flow detection value being greater than the target flow value, reducing the control opening of the electromagnetic regulating valve.

[0044] In this embodiment, a flow meter can be used to detect the flow rate of the compressed air pipeline in real time, and the flow rate detection value can be obtained from the flow meter in real time. The target flow rate value can be set according to user needs. By comparing the flow rate detection value with the target flow rate value, the opening of the electromagnetic control valve is controlled, achieving precise flow regulation control.

[0045] In some embodiments, the method for controlling the compressed air flow rate further includes: determining whether there is a pressure detection anomaly, a solenoid control valve failure, or a solenoid switch valve failure, and issuing a corresponding fault alarm.

[0046] In this embodiment, since the post-processing plant has extremely high safety requirements, if an equipment failure occurs, it is easy to cause leakage of radioactive materials, so the fault needs to be diagnosed in a timely manner. The control method of this embodiment also includes intelligent fault detection control. If any of the following fault types is diagnosed: pressure detection abnormality, electromagnetic control valve failure, electromagnetic switch valve failure, a corresponding fault alarm is issued.

[0047] In some embodiments, determining whether there is a pressure detection anomaly and issuing a corresponding fault alarm specifically includes: obtaining the gas source pressure detection value in real time; calculating the absolute value of the error between the pressure detection value and the preset pressure value; in response to the absolute value of the error between the pressure detection value and the preset pressure value being greater than a first preset threshold, issuing a pressure detection anomaly alarm and controlling the safety interlock to stop the vehicle.

[0048] In this embodiment, a pressure gauge can be used to detect the air source pressure of the pipeline transporting compressed air in real time, and the air source pressure detection value can be obtained in real time from the pressure gauge. The first preset threshold value can be set according to actual needs. An example of the preset pressure value is 0.2MPa (megapascals). The preset pressure value can be set at the DCS and sent to the control device for compression control flow, or set at the local terminal. The alarm includes an audible alarm and / or an indicator light alarm to remind the operator to check or take emergency measures.

[0049] In some embodiments, determining whether a solenoid control valve fault exists and issuing a corresponding fault alarm specifically includes: obtaining the actual opening of the solenoid control valve in real time; determining an overshoot based on the actual opening and the controlled opening; and, in response to the overshoot being greater than a second preset threshold, issuing a solenoid control valve fault alarm and controlling a safety interlock stop. Alternatively, obtaining the actual response time of the solenoid control valve in real time; calculating the absolute value of the difference between the actual response time and a preset time; and, in response to the absolute value of the difference between the actual response time and the preset time being greater than a third preset threshold, issuing a solenoid control valve fault alarm and controlling a safety interlock stop.

[0050] In this embodiment, the diagnostic criteria for electromagnetic control valve failure include excessive overshoot and excessive response time. The actual opening of the electromagnetic control valve can be obtained through a sensor. The actual opening refers to the degree to which the electromagnetic control valve is actually opened based on the controlled opening. If the electromagnetic control valve performance adjustment fails, there may be a data discrepancy between the controlled opening and the actual opening. The actual response time refers to the time elapsed between the moment the electromagnetic control valve receives the relevant command for the controlled opening and the moment it actually opens to the controlled opening. The second preset threshold, preset time, and third preset threshold can be appropriately set based on actual conditions.

[0051] In some embodiments, determining whether there is a solenoid switch valve fault and issuing a corresponding fault alarm specifically includes: obtaining the open position signal and the closed position signal of the solenoid switch valve in real time; in response to the open position signal and the closed position information being true at the same time, or the open position signal and the closed position information being false at the same time, issuing a solenoid switch valve fault alarm and controlling the safety interlock to stop the vehicle.

[0052] In this embodiment, the presence of a fault can be determined based on the status of the valve position switch (including the fully open and fully closed positions) of the electromagnetic on-off valve. If both display the fully closed position or the not fully closed position simultaneously, it can be determined that the electromagnetic on-off valve body or the valve position switch has a fault.

[0053] Specifically, when the gas source pressure detection is abnormal (such as the absolute value of the error between the gas source pressure detection value and the preset pressure value is greater than 10%), the control sends a fault alarm of the pressure detection abnormality and controls the safety interlock to stop. For the electromagnetic control valve, its failure mainly comes from the adjustment performance. For the electromagnetic switch valve, its failure mainly comes from the equipment itself, such as valve position failure (it cannot be judged whether it is fully open or fully closed), and the electromagnetic switch valve opens and closes at the same time with the same instruction. When any of the above fault types occurs, the control method of this embodiment can perform fault diagnosis and control automatic shutdown, and at the same time send a comprehensive fault alarm signal to the DCS to remind the operator to troubleshoot the fault, thereby ensuring the safety and stability of production operation. Its safety interlock logic is as follows: Figure 4 shown.

[0054] The compressed air flow control method of this embodiment eliminates the independent control of the pneumatic on-off valve and the electromagnetic control valve in related arts. Based on a stop command, a closing signal is simultaneously sent to the electromagnetic on-off valve and the electromagnetic control valve to block the compressed air supply. This results in the electromagnetic control valve being in a closed state (i.e., zero opening) when the air lift system is not operating. Furthermore, upon the next startup, an opening signal is simultaneously sent to the electromagnetic on-off valve and the electromagnetic control valve, causing the electromagnetic control valve to adjust from zero opening to the target flow opening. This prevents overshoot during radioactive liquid delivery and improves the operational control stability and safety of the air lift system. The flow output curve of the related art is shown in Figure 5(a), while the flow output curve of this embodiment is shown in Figure 5(b). A comparison of the two shows that the control method of this embodiment can avoid overshoot during the initial period of radioactive liquid delivery. Furthermore, since the electromagnetic control valve does not need to maintain its regulating function when the air lift system is not operating, its power supply can be turned off, preventing the valve from being energized for a long time and extending its service life. In addition, it has a fault diagnosis function, which automatically triggers the fault alarm mechanism to notify the operator to conduct inspections or take emergency measures, thereby achieving the automation and intelligent operation level of the air lifting system.

[0055] Example 2:

[0056] like Figure 6 As shown, this embodiment provides a device for controlling the flow of compressed air, and the method for controlling the flow of compressed air of embodiment 1 is applied. The control device includes an electromagnetic switch valve, an electromagnetic regulating valve, a control module ( Figure 6 not shown).

[0057] The control module is electrically connected to the electromagnetic switch valve and the electromagnetic regulating valve, which are connected in series to a pipeline for conveying compressed air. The control module is configured to receive a start command or a stop command, and, in response to the start command, simultaneously send an open signal to the electromagnetic switch valve and the electromagnetic regulating valve to start the compressed air supply, and, in response to the stop command, simultaneously send a close signal to the electromagnetic switch valve and the electromagnetic regulating valve to block the compressed air supply.

[0058] In some embodiments, the control module is also used to obtain the flow detection value in real time, and judge the size of the flow detection value and the target flow value. In response to the flow detection value being less than the target flow value, the control opening of the electromagnetic regulating valve is increased; in response to the flow detection value being equal to the target flow value, the electromagnetic regulating valve is controlled to maintain the current control opening; in response to the flow detection value being greater than the target flow value, the control opening of the electromagnetic regulating valve is reduced.

[0059] In some embodiments, the control module is further configured to determine whether there is a pressure detection anomaly, a solenoid control valve failure, or a solenoid switch valve failure, and issue a corresponding fault alarm.

[0060] In some embodiments, the control module is also used to obtain the air source pressure detection value in real time, and calculate the absolute value of the error between the pressure detection value and the preset pressure value. In response to the absolute value of the error between the pressure detection value and the preset pressure value being greater than a first preset threshold, a pressure detection abnormality alarm is issued, and a safety interlock parking control is performed.

[0061] In some embodiments, the control module is also used to obtain the actual opening of the electromagnetic control valve in real time, and determine the overshoot based on the actual opening and the controlled opening. In response to the overshoot being greater than a second preset threshold, an electromagnetic control valve fault alarm is issued, and the safety interlock is controlled to stop the vehicle. Alternatively, the control module is used to obtain the actual response time of the electromagnetic control valve in real time, and calculate the absolute value of the error between the actual response time and the preset time. In response to the absolute value of the error between the actual response time and the preset time being greater than a third preset threshold, an electromagnetic control valve fault alarm is issued, and the safety interlock is controlled to stop the vehicle.

[0062] In some embodiments, the control module is also used to obtain the open position signal and closed position signal of the electromagnetic switch valve in real time. In response to the open position signal and the closed position information being true at the same time, or the open position signal and the closed position information being false at the same time, an electromagnetic switch valve fault alarm is issued and a safety interlock parking control is controlled.

[0063] In some embodiments, the device for controlling the flow of compressed air further includes a pressure gauge and a flow meter.

[0064] The pressure gauge is connected to the control module and is used to detect the gas source pressure in the pipeline and obtain the gas source pressure detection value. The flow meter is connected to the control module and is used to detect the flow of compression control and obtain the flow detection value.

[0065] In some embodiments, the compressed air flow control device further comprises a bus. The bus is connected to the control module, the pressure gauge, and the flow meter. The compressed air flow control device adopts a bus communication method, which reduces the number of cables and the number of IO boards of the DCS. In some embodiments, such as Figure 7 As shown, the compressed air flow control device is used to receive the start or stop instructions, target flow value, and set working air source pressure value sent by the DCS. The compressed air flow control device is used to send flow detection values, electromagnetic switch valve position, electromagnetic control valve opening, comprehensive fault data and other data to the DCS for participating in the intelligent monitoring process of the entire post-processing plant.

[0066] The compressed air flow control device of this embodiment modularizes a pressure gauge, electromagnetic on / off valve, electromagnetic regulating valve, flow meter, and other components to form a novel compressed air flow control device for an air lift system. This eliminates the separate pneumatic on / off valve, gas flow meter, and pressure gauge in the original air lift system, optimizes the air lift system structure, and improves the automation and intelligence level of the air lift system. It enables simultaneous opening and closing of the on / off valve and regulating valve, preventing overshoot in the air lift system flow during device startup and improving the operational control stability and safety of the air lift system. The device also features a valve self-check function that automatically triggers a fault alarm mechanism to notify the operator to conduct an inspection or take emergency measures. Furthermore, when the air lift system is not operating, the electromagnetic regulating valve in the device does not need to maintain its regulating function, so its power supply can be turned off, preventing the electromagnetic valve from being energized for a long time, thereby extending the device's service life. The modular design also saves installation space, reduces the complexity of the air lift system, and significantly reduces the project cost. The device also incorporates an automatic pressure detection system that intelligently detects fluctuations in the air source pressure, preventing unstable operation of the air lift system caused by failures in the upstream compressed air system (power source), thereby improving the operational reliability of the air lift system.

[0067] Example 3:

[0068] like Figure 6 As shown, this embodiment provides an air lifting system, including an air lifting bottom section, a feed trough, a gas-liquid separation tank, a receiving tank, and the compressed air flow control device of Example 2.

[0069] The compressed air flow control device and the feed trough are respectively connected to the input end of the air lifting bottom section, the output end of the air lifting bottom section is connected to the input end of the gas-liquid separation tank, and the liquid output end of the gas-liquid separation tank is connected to the receiving tank.

[0070] In some embodiments, the pressure gauge, flow meter, control module, electromagnetic switch valve, and electromagnetic regulating valve in the compressed air flow control device adopt an integrated (modular) design, which optimizes the selection of instrumentation and control equipment, reduces the procurement cost of instrumentation and control equipment for the air lifting system, and streamlines the plant layout space. Through the linkage effect and fault diagnosis function of the equipment in the compressed air flow control device, the automatic control capability and intelligent detection of the air lifting system are improved. In the air lifting process of some related technologies, the gas flow meter, regulating valve, and pneumatic switch valve are respectively used as independent devices to perform the functions of measurement, regulation, and switching respectively. In this embodiment, in addition to having the above functions, the compressed air flow control device of the air lifting system also has pressure detection, flow detection and control, and intelligent fault diagnosis functions.

[0071] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for controlling compressed air flow, characterized in that: include: Receive a start command or a stop command; According to the start instruction, an opening signal is simultaneously sent to the electromagnetic switch valve and the electromagnetic regulating valve to start the compressed air supply, wherein the electromagnetic switch valve and the electromagnetic regulating valve are connected in series to the pipeline for conveying compressed air; According to the stop command, a closing signal is sent to the electromagnetic switch valve and the electromagnetic regulating valve at the same time to block the compressed air supply.

2. The method for controlling the compressed air flow rate according to claim 1, wherein: After simultaneously sending the opening signal to the electromagnetic switch valve and the electromagnetic regulating valve according to the start instruction, the method further includes: Obtain flow detection values ​​in real time; Determine the size of the flow detection value and the target flow value; In response to the flow rate detection value being less than the target flow rate value, increasing the control opening of the electromagnetic regulating valve; In response to the flow detection value being equal to the target flow value, controlling the electromagnetic regulating valve to maintain the current control opening; In response to the flow rate detection value being greater than the target flow rate value, the control opening of the electromagnetic regulating valve is reduced.

3. The method for controlling the compressed air flow rate according to claim 2, wherein: Also includes: Determine whether there is a pressure detection abnormality, a solenoid control valve failure, or a solenoid switch valve failure, and issue a corresponding fault alarm.

4. The method for controlling the compressed air flow rate according to claim 3, wherein: Determine whether there is any abnormality in pressure detection and issue a corresponding fault alarm, including: Get the gas source pressure detection value in real time; Calculate the absolute value of the error between the pressure detection value and the preset pressure value; In response to an absolute value of an error between the pressure detection value and the preset pressure value being greater than a first preset threshold, a pressure detection abnormality alarm is issued, and a safety interlock is controlled to stop the vehicle.

5. The method for controlling the compressed air flow rate according to claim 3, wherein: Determine whether there is a solenoid control valve fault and issue a corresponding fault alarm, including: Obtain the actual opening of the electromagnetic control valve in real time; determining an overshoot according to the actual opening and the controlled opening; In response to the overshoot being greater than a second preset threshold, a solenoid control valve fault alarm is issued, and the vehicle is controlled to stop by a safety interlock. Or, obtain the actual response time of the electromagnetic control valve in real time; Calculate the absolute value of the error between the actual response time and the preset time; In response to the absolute value of the error between the actual response time and the preset time being greater than a third preset threshold, a solenoid control valve failure alarm is issued, and the vehicle is controlled to stop via a safety interlock.

6. The method for controlling the compressed air flow rate according to claim 3, characterized in that: Determine whether there is a solenoid switch valve fault and issue a corresponding fault alarm, including: Real-time acquisition of the open and close position signals of the electromagnetic switch valve; In response to the open position signal and the close position information being true at the same time, or the open position signal and the close position information being false at the same time, an electromagnetic switch valve fault alarm is issued and the safety interlock is controlled to stop the vehicle.

7. A device for controlling compressed air flow, characterized in that: The method for controlling the compressed air flow rate according to any one of claims 1 to 6 is applied, wherein the control device comprises an electromagnetic switch valve, an electromagnetic regulating valve, and a control module. The control module is electrically connected to the electromagnetic switch valve and the electromagnetic regulating valve. The electromagnetic switch valve and the electromagnetic regulating valve are connected in series on the pipeline for conveying compressed air. The control module is used to receive start instructions or stop instructions. and, for simultaneously sending an opening signal to the electromagnetic switch valve and the electromagnetic regulating valve according to the starting instruction to start the compressed air supply, And, it is used to send a closing signal to the electromagnetic switch valve and the electromagnetic regulating valve at the same time according to the stop instruction to block the compressed air supply.

8. The compressed air flow control device according to claim 7, characterized in that: Also includes pressure gauge, flow meter, The pressure gauge is connected to the control module and is used to detect the gas source pressure in the pipeline and obtain the gas source pressure detection value. The flow meter is connected to the control module and is used to detect the flow of compression control and obtain a flow detection value.

9. The compressed air flow control device according to claim 7, characterized in that: Also includes bus, Bus, connected with control module, pressure gauge and flow meter.

10. An air lifting system, characterized in that: It includes an air lifting bottom section, a feeding trough, a gas-liquid separation tank, a receiving tank, and a compressed air flow control device according to any one of claims 7 to 9. The compressed air flow control device and the feed trough are connected to the input end of the air lifting bottom section respectively. The output end of the empty lifting bottom section is connected to the input end of the gas-liquid separation tank. The liquid output end of the gas-liquid separation tank is communicated with the receiving tank.

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