Storage tank liquid level automatic calibration system and method and electronic equipment

Abstract

The invention discloses a storage tank liquid level automatic calibration system and method and electronic equipment, and belongs to the technical field of liquid level and volume relation calibration of volume equipment. The system comprises a first calibration liquid level meter, a metering module and an operation display module. And the first calibration liquid level meter is used for measuring the liquid level height of the first storage tank. And the metering module is communicated with the first storage tank through a pipeline, and is used for executing switching of calibration modes and measuring the flow of the deionized water for calibration. And the operation display module is connected with the first calibration liquid level meter, the metering module and the first storage tank body liquid level meter, and is used for controlling switching of calibration modes and calculating a liquid level volume relational expression of the first storage tank according to a measurement result of the first calibration liquid level meter, a measurement result of the metering module and a measurement result of the first storage tank body liquid level meter. The system can solve the problems that calibration efficiency is low, errors are large, many workers are needed, and dependence on a formal control system is high in the prior art.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid level and volume relationship calibration of volumetric equipment, and in particular relates to a tank liquid level automatic calibration system, method and electronic equipment. Background Art

[0002] During the construction and commissioning phase of an engineering project, various storage tanks and pits often need to be calibrated for level-volume calibration to derive the mathematical relationship between level and volume, so that operators can calculate the volume of the medium based on the real-time level.

[0003] Among the existing calibration methods in the nuclear industry, two methods are commonly used, namely fixed volume measurement (measuring cup, measuring cylinder, etc.) and flow level calibration.

[0004] Solid volume measurement refers to manually adding a certain volume of deionized water into the storage tank through a measuring cup or a measuring cylinder each time, and then observing the liquid level in the storage tank, recording the liquid level and the volume of deionized water added, so as to complete the calibration. This method is suitable for equipment with smaller volume. If it involves multiple measuring cup measurements, the error is large and the efficiency is low.

[0005] The flow level calibration method refers to connecting the pump and the flow meter through a simple pipeline, and then transporting the deionized water to the target storage tank after being measured by the flow meter. A temporary tape measure is set at the target storage tank to read the liquid level value, and the error is compared with the formal liquid level meter reading. Finally, the volume calculated by the flow meter and the liquid level indication of the liquid level meter are used to fit the liquid level-volume curve relationship. In this way, the tape measure needs to be read by personnel on site, and the formal liquid level meter and flow meter can be recorded manually, but the risk of human error is increased and more personnel are required. If it is sent to the formal control system through a temporary cable for automatic recording and display, it will be subject to the installation and availability of the formal control system. In addition, since the storage tanks are very scattered in the factory, the temporary cables need to change the path frequently, resulting in low efficiency and increased costs. Therefore, the flow level calibration method has the problems of low calibration efficiency, large errors, more personnel required, and high dependence on the formal control system. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a tank liquid level automatic calibration system, method and electronic equipment in view of the above-mentioned deficiencies in the prior art, which can improve the calibration efficiency and the accuracy of the calibration results, reduce labor costs and be portable.

[0007] In a first aspect, the present invention provides a tank liquid level automatic calibration system, comprising a first calibration liquid level gauge, a metering module, and a calculation and display module.

[0008] The first calibration liquid level gauge is used to measure the liquid level height of the first storage tank. The metering module is connected to the first storage tank through a pipeline and is used to switch the calibration mode and measure the flow rate of deionized water for calibration. The operation and display module is connected to the first calibration liquid level gauge, the metering module, and the first storage tank body liquid level gauge to control the switching of the calibration mode and calculate the liquid level volume relationship of the first storage tank according to the measurement results of the first calibration liquid level gauge, the measurement results of the metering module, and the measurement results of the first storage tank body liquid level gauge.

[0009] Preferably, the automatic calibration system further comprises a second calibration liquid level gauge.

[0010] The second calibration liquid level gauge is used to measure the liquid level height of the second storage tank. The metering module is connected to the second storage tank through a pipeline and is used to measure the flow rate of calibration deionized water flowing from the first storage tank to the second storage tank. The operation display module is connected to the second calibration liquid level gauge and the second storage tank body liquid level gauge and is used to calculate the liquid level volume relationship of the second storage tank according to the measurement results of the second calibration liquid level gauge, the measurement results of the metering module, and the measurement results of the second storage tank body liquid level gauge.

[0011] Preferably, the metering module includes a first remote-controlled valve, a pump, a flow meter, and a second remote-controlled valve connected in series by a pipeline, wherein the first remote-controlled valve is connected to the first inlet pipeline, and the second remote-controlled valve is connected to the first outlet pipeline. The calibration mode includes an automatic water filling calibration mode. The operation and display module is used to control the metering module to open the first remote-controlled valve, the pump, and the second remote-controlled valve after the automatic water filling calibration mode is turned on, so that deionized water flows from the first outlet pipeline into the first storage tank. The operation and display module is also used to control the metering module to close the pump, the first remote-controlled valve, and the second remote-controlled valve when the measurement result of the first calibration liquid level gauge or the first storage tank body liquid level gauge reaches the range threshold.

[0012] Preferably, the metering module also includes a third remote control valve and a fourth remote control valve, wherein one end of the third remote control valve is connected to the first outlet pipe, and the other end thereof is serially connected to the pipe between the pump and the first remote control valve, and one end of the fourth remote control valve is serially connected to the pipe between the flow meter and the second remote control valve, and the other end thereof is connected to the second outlet pipe. The calibration mode also includes an automatic drainage calibration mode. The operation and display module is used to control the first remote control valve and the second remote control valve of the metering module to be in a closed state after the automatic drainage calibration mode is turned on, and to control the metering module to open the third remote control valve, the pump, and the fourth remote control valve so that deionized water flows out of the first storage tank and is discharged through the second outlet pipe. The operation and display module is also used to control the metering module to close the pump, the third remote control valve, and the fourth remote control valve when the measurement result of the first calibration level gauge or the first storage tank body level gauge reaches within the zero deviation range.

[0013] Preferably, the metering module further includes a fifth remote control valve, one end of which is serially connected to the pipeline between the pump and the flow meter, and the other end of which is connected to the second inlet pipeline. The calibration mode also includes a gravity self-flow calibration mode. The operation display module is used to control the first remote control valve, the pump, the third remote control valve, and the fourth remote control valve to be in a closed state after the gravity self-flow calibration mode is turned on, and control the metering module to open the fifth remote control valve and the second remote control valve, so that deionized water flows in from the second inlet pipeline and flows out through the first outlet pipeline.

[0014] Preferably, the metering module further comprises a manual valve, which is serially connected to the pipeline between the pump and the flow meter and is used for isolation in different calibration modes.

[0015] Preferably, the operation and display module is further used to compare the measurement result of the first calibrated liquid level gauge with the measurement result of the first storage tank body liquid level gauge to determine the calibration error.

[0016] In a second aspect, the present invention further provides a method for automatic calibration of a storage tank liquid level, which is applied to the automatic calibration system for a storage tank liquid level described in the first aspect, and comprises: receiving a calibration mode instruction; controlling the switching of the calibration mode according to the instruction, and calculating the liquid level-volume relationship of the first storage tank according to the measurement results of the first calibration liquid level gauge, the measurement results of the metering module, and the measurement results of the first storage tank body liquid level gauge.

[0017] Preferably, the liquid level-volume relationship equation of the first storage tank is calculated based on the measurement results of the first calibrated liquid level gauge, the measurement results of the metering module and the measurement results of the first storage tank body liquid level gauge, which specifically includes: judging whether the measurement results of the first calibrated liquid level gauge and the measurement results of the first storage tank body liquid level gauge are less than the calibration error; in response to being less than the calibration error, determining the first calibrated liquid level gauge or the first storage tank body liquid level gauge as the target liquid level gauge; in response to being greater than or equal to the calibration error, determining the first calibrated liquid level gauge as the target liquid level gauge; sampling and fitting the measurement results of the metering module and the target liquid level gauge to generate the liquid level-volume relationship equation of the first storage tank.

[0018] In a third aspect, the present invention further provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the tank liquid level automatic calibration method described in the second aspect by executing the computer instructions.

[0019] The automatic calibration system, method and electronic device for the storage tank liquid level provided by the present invention adopts a calibration liquid level meter to automatically measure the liquid level height of the storage tank, adopts a metering module to automatically switch between different calibration modes and measure the flow rate of deionized water, adopts an operation and display module to analyze and process the measurement results of the calibration liquid level meter, the measurement results of the storage tank body liquid level meter, and the measurement results of the metering module, and automatically calculates the liquid level volume relationship of the storage tank, thereby realizing automatic calibration of the liquid level of the storage tank or pit, reducing the cost of manual measurement, and improving the calibration efficiency. In addition, automated calibration can avoid human errors, thereby improving the accuracy of the calibration results. And because the processing and analysis of the measurement results are completed through the operation and display module, there is no need to rely on the formal control system, which has the advantage of being easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a tank liquid level automatic calibration system according to Example 1 of the present invention;

[0021] Figure 2 Schematic diagram of another automatic tank liquid level calibration system according to Example 1 of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a computing module according to Embodiment 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of interface buttons of a computing display module according to Example 1 of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] 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.

[0026] It can be understood that, in the absence of conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other.

[0027] It can be understood that, for the convenience of description, the drawings of the present invention only show the parts related to the present invention, while the parts irrelevant to the present invention are not shown in the drawings.

[0028] 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.

[0029] It can 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.

[0030] 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 the 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 by a hardware-based system that implements the specified functions, or may be implemented by a combination of hardware and computer instructions.

[0031] 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.

[0032] Embodiment 1:

[0033] like Figure 1 As shown, this embodiment provides a tank liquid level automatic calibration system, which is suitable for scenes where liquid level calibration is required, such as tanks and pits, and is particularly suitable for tank liquid level calibration scenes in nuclear facility plants. The tank liquid level automatic calibration system includes a first calibration liquid level gauge, a metering module, and an operation and display module.

[0034] The first calibration liquid level gauge is used to measure the liquid level height of the first storage tank. The metering module is connected to the first storage tank through a pipeline and is used to switch the calibration mode and measure the flow rate of deionized water for calibration. The operation and display module is connected to the first calibration liquid level gauge, the metering module, and the first storage tank body liquid level gauge to control the switching of the calibration mode and calculate the liquid level volume relationship of the first storage tank according to the measurement results of the first calibration liquid level gauge, the measurement results of the metering module, and the measurement results of the first storage tank body liquid level gauge.

[0035] In this embodiment, the calibration level gauge is used to measure the liquid level height of the storage tank and give the standard height. The calibration level gauge can select a variety of liquid level instruments with measurement principles, such as air blowing instruments, radar level gauges, ultrasonic level gauges, etc. It is preferred that the liquid level gauge does not need to be inserted into the liquid in the storage tank and has a relatively large range and can be freely set. The metering module is used to perform switching between different calibration modes, as well as to measure the flow of deionized water for calibration. The metering module includes a pump, a remote control valve, and a flow meter connected by a pipeline. The pump is used to transport the calibration medium (such as deionized water), and the remote control valve is used to realize the on-off of liquid transportation, and is also used to realize the automatic switching of filling and drainage. The operation display module includes a human-machine interface and a logic processing center, and the automation program of the carrier device is used to perform logical operations based on the data measured by the metering module, the calibration level gauge, and the storage tank body level gauge to obtain the storage tank liquid level volume relationship. The operation display module is connected to the metering module, the calibration level gauge, and the storage tank body level gauge by a cable, and the metering module is connected to the on-site water tank or storage tank through a soft pipe or a hard pipe. Since the calibrated liquid level gauge automatically measures the liquid level height of the storage tank, the metering module automatically switches between different calibration modes and measures the flow rate of deionized water, and the operation and display module automatically calculates the liquid level-volume relationship of the storage tank, the automatic calibration system for the storage tank liquid level based on this embodiment can realize automatic calibration of the liquid level of the storage tank or pit, reduce the cost of manual measurement, improve the calibration efficiency, improve the accuracy of the calibration results, and has the advantage of being easy to use.

[0036] Optionally, the tank liquid level automatic calibration system further includes a second calibration liquid level gauge. The second calibration liquid level gauge is used to measure the liquid level height of the second tank. The metering module is connected to the second tank through a pipeline and is used to measure the flow rate of calibration deionized water flowing from the first tank to the second tank. The operation and display module is connected to the second calibration liquid level gauge and the second tank body liquid level gauge and is used to calculate the liquid level-volume relationship of the second tank based on the measurement results of the second calibration liquid level gauge, the measurement results of the metering module, and the measurement results of the second tank body liquid level gauge.

[0037] In this embodiment, Figure 2 As shown, the tank liquid level automatic calibration system includes two calibration liquid level gauges, a metering module, and an operation and display module, wherein the two calibration liquid level gauges are used to measure the liquid level heights of the two tanks, respectively. Since the number of storage tanks in the nuclear facility building is very large and the time period required for the construction and commissioning phase is short, it takes a long time to calibrate the liquid level of each storage tank one by one. If the liquid level calibration is performed by increasing the number of storage tank liquid level automatic calibration systems, the commissioning cost will be greatly increased. Therefore, in this embodiment, under the condition of adding a calibration liquid level gauge, the automatic calibration system can calibrate the liquid levels of two storage tanks at the same time, which can significantly improve the efficiency of liquid level calibration compared to the one-by-one calibration method, and can reduce the commissioning cost compared to the method of increasing the number of automatic calibration systems. Figure 2As shown, deionized water can flow out from the first storage tank, flow through the flow meter of the metering module, and flow into the second storage tank (or deionized water flows out from the second storage tank and flows into the first storage tank), wherein the first calibrated liquid level gauge is used to measure the liquid level change of the first storage tank, the second calibrated liquid level gauge is used to measure the liquid level change of the second storage tank, and the operation and display module is used to calculate the liquid level-volume relationship between the first storage tank and the second storage tank, respectively.

[0038] Optionally, the metering module includes a first remote-controlled valve, a pump, a flow meter, and a second remote-controlled valve connected in series by a pipeline, wherein the first remote-controlled valve is connected to the first inlet pipeline, the second remote-controlled valve is connected to the first outlet pipeline, and the calibration mode includes an automatic water filling calibration mode. The operation and display module is used to control the metering module to open the first remote-controlled valve, the pump, and the second remote-controlled valve after the automatic water filling calibration mode is turned on, so that deionized water flows from the first outlet pipeline into the first storage tank. The operation and display module is also used to control the metering module to close the pump, the first remote-controlled valve, and the second remote-controlled valve when the measurement result of the first calibration level gauge or the first storage tank body level gauge reaches the range threshold.

[0039] In this embodiment, the automatic water filling calibration mode means that after the program starts the automatic water filling calibration mode, the corresponding remote control valve interlock is opened on the water filling calibration circuit during the calibration process, and the remote control valves of other circuits remain closed. The metering module receives deionized water from the site through a pipeline, and records the cumulative flow in the calculation and display module through the cumulative flow meter in the metering module, and automatically retains the historical trend of the flow meter data. The calibration liquid level meter and the storage tank body liquid level meter record and display the real-time liquid level of the storage tank in the calculation and display module, and automatically save the historical data trend of the liquid level meter and flow meter. Usually when the storage tank is calibrated to be empty for the first time, the automatic water filling calibration mode is used, that is, the storage tank water filling calibration verification is performed first. If Figure 3 As shown, the metering module includes a first remote-controlled valve A-BD001VV, a pump BD001PO, a flow meter BD001MD, and a second remote-controlled valve A-BD002VV which are connected in series by pipelines, wherein the first remote-controlled valve A-BD001VV is connected to the first inlet pipeline, and the second remote-controlled valve A-BD002VV is connected to the first outlet pipeline.

[0040] for Figure 1 In the tank liquid level automatic calibration system shown, the first inlet pipe (i.e., inlet 1) can be connected to the on-site water tank, and the first outlet pipe (i.e., outlet 1) can be connected to the first tank. The operation display module is used to control the metering module to open the first remote control valve A-BD001VV, the pump BD001PO, and the second remote control valve A-BD002VV after the automatic water filling calibration mode is turned on, so that deionized water flows from the first outlet pipe into the first tank.

[0041] for Figure 2In the tank liquid level automatic calibration system shown, the first inlet pipe can be connected to the first tank, and the first outlet pipe can be connected to the second tank. The operation display module is used to control the metering module to open the first remote control valve A-BD001VV, the pump BD001PO, and the second remote control valve A-BD002VV after the automatic water filling calibration mode is turned on, so that deionized water flows from the first tank to the second tank.

[0042] Optionally, the metering module also includes a third remote control valve and a fourth remote control valve, wherein one end of the third remote control valve is connected to the first outlet pipe, and the other end thereof is serially connected to the pipe between the pump and the first remote control valve, and one end of the fourth remote control valve is serially connected to the pipe between the flow meter and the second remote control valve, and the other end thereof is connected to the second outlet pipe. The calibration mode also includes an automatic drainage calibration mode. The operation and display module is used to control the first remote control valve and the second remote control valve of the metering module to be in a closed state after the automatic drainage calibration mode is turned on, and to control the metering module to open the third remote control valve, the pump, and the fourth remote control valve so that deionized water flows out of the first storage tank and is discharged through the second outlet pipe. The operation and display module is also used to control the metering module to close the pump, the third remote control valve, and the fourth remote control valve when the measurement result of the first calibration level gauge or the first storage tank body level gauge reaches within the zero deviation range.

[0043] In this embodiment, the automatic drainage calibration mode means that after the program starts the automatic drainage calibration mode, the corresponding remote control valve interlock on the drainage calibration circuit is opened during the calibration process, and the remote control valves of other circuits remain closed. The metering module transports the deionized water in the storage tank to the on-site water tank or other storage tank through a pipeline, and the cumulative flow meter in the metering module records the cumulative flow in the calculation and display module, and automatically retains the historical trend of the flow meter data. The calibration liquid level meter and the storage tank body liquid level meter record and display the real-time liquid level of the storage tank in the calculation and display module and automatically save the historical data trend of the liquid level meter and flow meter. Optionally, after the storage tank reaches the target liquid level, the automatic drainage calibration mode is used to perform the storage tank drainage verification calibration. Figure 3 As shown, the metering module includes a first remote control valve A-BD001VV, a pump BD001PO, a flow meter BD001MD, a second remote control valve A-BD002VV, a third remote control valve A-BD003VV, and a fourth remote control valve A-BD004VV connected by pipelines.

[0044] for Figure 1In the tank level automatic calibration system shown, the second outlet pipe (i.e., outlet 2) can be connected to the on-site water tank or other tanks, and the first outlet pipe (i.e., outlet 1) can be connected to the first tank. The operation display module is used to control the first remote control valve A-BD001VV and the second remote control valve A-BD002VV of the metering module to be in a closed state after the automatic drainage calibration mode is turned on, and control the metering module to open the third remote control valve A-BD003VV, the pump BD001PO, and the fourth remote control valve A-BD004VV, so that deionized water flows out of the first tank and is discharged through the second outlet pipe.

[0045] for Figure 2 In the tank level automatic calibration system shown, the first outlet pipe (i.e., outlet 1) can be connected to the first tank, and the second outlet pipe (i.e., outlet 2) can be connected to the second tank. The operation display module is used to control the first remote control valve A-BD001VV and the second remote control valve A-BD002VV of the metering module to be in a closed state after the automatic drainage calibration mode is turned on, and control the metering module to open the third remote control valve A-BD003VV, the pump BD001PO, and the fourth remote control valve A-BD004VV, so that deionized water flows out of the first tank and is discharged to the second tank through the second outlet pipe.

[0046] Optionally, the metering module further includes a fifth remote control valve, one end of which is serially connected to the pipe between the pump and the flow meter, and the other end of which is connected to the second inlet pipe. The calibration mode also includes a gravity self-flow calibration mode. The operation and display module is used to control the first remote control valve, the pump, the third remote control valve, and the fourth remote control valve to be in a closed state after the gravity self-flow calibration mode is turned on, and control the metering module to open the fifth remote control valve and the second remote control valve, so that deionized water flows in from the second inlet pipe and flows out through the first outlet pipe.

[0047] In this embodiment, the gravity self-flow calibration mode can be applied to the situation where the height difference between the water source and the storage tank does not require the pump to provide power to deliver the water source to the storage tank. Since different storage tanks in the nuclear facility are located on different floors, setting the gravity self-flow calibration mode can save energy consumption during the calibration process (such as the power required for pump operation), and avoid the repeated use of the on-site water tank to collect deionized water during the calibration process, simplify the repeated operation of batch calibration, and further improve the calibration efficiency. For example, in the gravity self-flow calibration mode, the storage tank located downstairs receives deionized water from the storage tank upstairs, avoiding the use of the on-site water tank to collect deionized water from the storage tank upstairs. The gravity self-flow calibration mode means that after the program starts the gravity self-flow calibration mode, the corresponding remote control valve on the gravity self-flow calibration circuit is interlocked and opened during the calibration process, and the remote control valves of other circuits remain closed. The metering module receives deionized water through the gravity self-flow circuit, and records the cumulative flow in the calculation display module through the cumulative flow meter in the metering module, and automatically retains the historical trend of the flow meter data. In this mode, the pump in the metering module does not need to be running. The calibration level meter and the tank body level meter record and display the real-time tank level in the operation display module and automatically save the historical data trend of the level meter and flow meter. Figure 3 As shown, the metering module includes a first remote control valve A-BD001VV, a pump BD001PO, a flow meter BD001MD, a second remote control valve A-BD002VV, a third remote control valve A-BD003VV, a fourth remote control valve A-BD004VV, and a fifth remote control valve A-BD005VV connected by pipelines. The operation display module is used to control the first remote control valve A-BD001VV, the pump BD001PO, the third remote control valve A-BD003VV, and the fourth remote control valve A-BD004VV to be in a closed state after the gravity self-flow calibration mode is turned on, and control the metering module to open the fifth remote control valve A-BD005VV and the second remote control valve A-BD002VV, so that deionized water flows in from the second inlet pipeline (i.e., inlet 2) and flows out through the first outlet pipeline (i.e., outlet 1).

[0048] Optionally, the calibration mode also includes a reflux mode. The reflux mode is a non-calibration mode used in some occasions where flow metering is not required and only a pump is required to transfer the medium. For example, after the program turns on the reflux mode, the corresponding remote control valve interlock on the reflux loop is opened, and the remote control valves of other loops remain closed. The metering module receives deionized water from the on-site water tank or the target storage tank through a pipeline and transports it to a specified location through an outlet.

[0049] Optionally, the metering module further comprises a manual valve. Figure 3 As shown, the manual valve M-BD001VV is connected in series to the pipeline between the pump and the flow meter and is used for isolation in different calibration modes. By setting the manual valve, the accuracy of the calibration results can be improved and the safety of the calibration system can be improved.

[0050] Optionally, the operation and display module is further used to compare the measurement result of the first calibrated liquid level gauge with the measurement result of the first storage tank body liquid level gauge to determine the calibration error.

[0051] In this embodiment, when calibrating the storage tank, it is necessary to verify the calibration error of the tank body liquid level gauge to avoid measurement errors in the tank body liquid level gauge, which may affect the production safety after the subsequent storage tank is put into use. Figure 2 In the tank liquid level automatic calibration system shown, the operation display module is also used to compare the measurement result of the second calibration liquid level gauge with the measurement result of the second tank body liquid level gauge to determine the calibration error.

[0052] Optionally, the calculation and display module is also used to receive user instructions and display the calibration results. Figure 4 As shown, the user can input instructions through the interface buttons displayed on the operation display module (such as water filling calibration, drainage calibration, gravity self-flow calibration, no flow meter mode, calibration pause, etc.), where the no flow meter mode is the reflux mode. The operation display mode can also automatically start the automatic water filling mode or automatic drainage mode according to the measurement result of the liquid level in the storage tank.

[0053] Alternatively, if Figure 3 In the automatic calibration system shown, the operation and display module is also used to set the acceptable range α of the zero deviation of the tank body liquid level gauge BT001ML and the calibration liquid level gauge BD001ML, set the range of the calibration liquid level gauge BD001ML, and set the maximum allowable deviation value δ between the tank body liquid level gauge BT001ML and the calibration liquid level gauge BD001ML before starting the calibration mode. The operation and display module is also used to perform self-test scans to ensure that all remote control devices have no fault signals in the operation and display module; to ensure that the display values ​​of the tank body liquid level gauge BT001ML and the calibration liquid level gauge BD001ML do not exceed the acceptable deviation α; to ensure that the difference between the tank body liquid level gauge BT001ML and the calibration liquid level gauge BD001ML does not exceed the maximum allowable deviation value δ; to ensure that the remote control valves A-BD001VV~A-BD005VV and the pump BD001PO are in the closed position.

[0054] Optionally, when the operation and display module is used to calculate the water filling fitting curve, it is specifically used to sample the historical trends of the liquid level meter and the flow meter, and set the sampling data interval (there are two intervals to choose from, time interval or liquid level value interval), and is also used to select the number of segments of the fitting function, as well as to perform trend sampling and fit the formula closest to the sampling value to generate the water filling fitting curve (i.e., the liquid level-volume relationship of the storage tank).

[0055] Optionally, when the operation and display module is used to calculate the drainage fitting curve, it is specifically used to sample the historical trends of the liquid level meter and the flow meter, and to subtract the maximum volume value displayed by the flow meter during the filling process from the volume value of the flow meter after sampling during the drainage process, so as to participate in the fitting of the liquid level-volume curve as the remaining volume in the storage tank. The operation and display module is used to set the sampling data interval, select the number of segments of the fitting function, and automatically perform trend sampling and fit the formula closest to the sampling value to generate the drainage fitting curve (i.e., the liquid level volume relationship of the storage tank).

[0056] Optionally, the operation and display module is further used to compare the error between the filling fitting curve and the drainage fitting curve. In response to the error being greater than a preset threshold, a second water inlet calibration is initiated. In response to the error being less than the preset threshold, the calibration result is determined to be correct. Since the operation and display module can analyze and process the measured liquid level data and flow data and calculate the liquid level volume relationship, it does not rely on a formal control system and does not need to lay too many cables, thereby improving portability.

[0057] The automatic calibration system for the liquid level of the storage tank provided in this embodiment uses a calibration liquid level gauge to automatically measure the liquid level height of the storage tank, uses a metering module to automatically switch between different calibration modes and measure the flow rate of deionized water, and uses an operation and display module to analyze and process the measurement results of the calibration liquid level gauge, the measurement results of the storage tank body liquid level gauge, and the measurement results of the metering module, and automatically calculates the liquid level volume relationship of the storage tank, thereby realizing automatic calibration of the liquid level of the storage tank or pit, reducing the cost of manual measurement, and improving the calibration efficiency. In addition, automated calibration can avoid human errors, thereby improving the accuracy of the calibration results. And because the processing and analysis of the measurement results are completed through the operation and display module, there is no need to rely on the formal control system, which has the advantage of being easy to use. Furthermore, under the condition of adding a calibration liquid level gauge, the liquid level calibration of two storage tanks can be carried out at the same time, which can significantly improve the efficiency of liquid level calibration compared to the method of calibrating one by one, and can reduce the debugging cost compared to the method of increasing the number of calibration systems. In addition, setting the gravity self-flow calibration mode can save energy consumption during the calibration process (such as the electricity required for pump operation), and avoid the reuse of deionized water collected in the on-site water tank during the calibration process, simplify the repetitive operation of batch calibration, and further improve the calibration efficiency. Finally, the dual level gauges (i.e., calibration level gauge and tank level gauge) are redundantly displayed in real time, and the remote control valve and pump are interlocked to avoid overflow and ensure the safety of personnel, equipment, and plant.

[0058] Embodiment 2:

[0059] This embodiment provides a method for automatic calibration of a tank liquid level, which is applied to the automatic calibration system for a tank liquid level described in Embodiment 1, or to the calculation and display module of the automatic calibration system for a tank liquid level described in Embodiment 1. The method includes:

[0060] Step 201, receiving a calibration mode instruction.

[0061] Step 202, according to the instruction control calibration mode switching, and according to the measurement results of the first calibration liquid level gauge, the measurement results of the metering module, and the measurement results of the first tank body liquid level gauge, calculate the liquid level volume relationship of the first storage tank.

[0062] Optionally, based on the measurement results of the first calibrated liquid level gauge, the measurement results of the metering module and the measurement results of the first tank body liquid level gauge, the liquid level-volume relationship equation of the first storage tank is calculated, specifically including: judging whether the measurement results of the first calibrated liquid level gauge and the measurement results of the first tank body liquid level gauge are less than the calibration error; in response to being less than the calibration error, determining the first calibrated liquid level gauge or the first tank body liquid level gauge as the target liquid level gauge; in response to being greater than or equal to the calibration error, determining the first calibrated liquid level gauge as the target liquid level gauge; sampling and fitting the measurement results of the metering module and the target liquid level gauge to generate the liquid level-volume relationship equation of the first storage tank.

[0063] The following example is based on Figure 1 The automatic calibration system for storage tank liquid level describes in detail the automatic calibration method for storage tank liquid level.

[0064] In the operation display module, the acceptable range α of the zero deviation of the first tank body liquid level gauge and the first calibration liquid level gauge is set, the measuring range of the first calibration liquid level gauge is set, and the maximum allowable deviation value δ of the first tank body liquid level gauge and the first calibration liquid level gauge is set.

[0065] The automatic calibration system for the storage tank liquid level enters a self-test scan to ensure that all remote control devices have no fault signals in the operation display module: specifically, ensure that the display values ​​of the first storage tank body liquid level gauge and the first calibration liquid level gauge do not exceed the acceptable deviation α; ensure that the difference between the first storage tank body liquid level gauge and the first calibration liquid level gauge does not exceed the maximum allowable deviation value δ; ensure that the remote control valves A-BD001VV~A-BD005VV and pump BD001PO are in the closed position.

[0066] Start one-button automatic water filling calibration. Deionized water enters the metering module from inlet 1, and the water source comes from the on-site supply.

[0067] The operation display module controls the metering module to open the first remote control valve A-BD001VV, pump BD001PO, and second remote control valve A-BD002VV in sequence to fill water. At this time, the third remote control valve A-BD003VV, the fourth remote control valve A-BD004VV, and the fifth remote control valve A-BD005VV are in the closed state, and the manual valve M-BD001VV is in the open state.

[0068] Deionized water enters the first storage tank from outlet 1.

[0069] The operation and display module records the data trends of the first storage tank body liquid level gauge, the first calibration liquid level gauge, and the flow meter BD001MD, and saves them automatically.

[0070] When either the first tank body liquid level gauge or the first calibration liquid level gauge reaches the maximum setting range, the pump BD001PO, the first remote control valve A-BD001VV, and the second remote control valve A-BD002VV are closed in sequence.

[0071] Water filling calibration is completed.

[0072] Turn on the one-button automatic drainage calibration. Deionized water enters the metering module from outlet 1, and the water source comes from the first storage tank.

[0073] The operation display module controls the metering module to open the third remote control valve A-BD003VV, pump BD001PO, and fourth remote control valve A-BD004VV in sequence to drain water. At this time, the first remote control valve A-BD001VV, the second remote control valve A-BD002VV, and the fifth remote control valve A-BD005VV are in the closed state, and the manual valve M-BD001VV is in the open state.

[0074] The deionized water in the first storage tank is discharged from the outlet 2 through the metering module to an on-site water tank or other equipment.

[0075] The operation and display module records the trends of the first tank body liquid level gauge, the first calibration liquid level gauge, and the flow meter BD001MD, and saves them automatically.

[0076] When both the first tank body liquid level gauge or the first calibration liquid level gauge reach within the zero position deviation α, the pump BD001PO, the third remote control valve A-BD003VV, and the fourth remote control valve A-BD004VV are closed in sequence.

[0077] Drain calibration completed.

[0078] After the filling and drainage are completed, the liquid level-volume curve is fitted. Two curves can be fitted according to the liquid level-volume data of filling and drainage respectively.

[0079] Filling curve fitting: Sample the historical trends of the level meter and flow meter. Set the sampling data interval, there are two intervals to choose from, time interval or level value interval; select the number of segments of the fitting function. The calculation display module automatically performs trend sampling and fits the formula closest to the sampling value to generate a fitting curve.

[0080] Drainage curve fitting: Sample the historical trends of the first level meter and flow meter. Subtract the maximum volume value displayed by the flow meter during the filling process from the volume value of the flow meter after sampling during the drainage process, and use it as the remaining volume in the first storage tank to participate in the fitting of the level-volume curve. Set the sampling data interval, there are two intervals to choose from, time interval or level value interval; select the number of segments of the fitting function. The calculation display module automatically performs trend sampling and fits the formula closest to the sampling value to generate a fitting curve.

[0081] Theoretically, the filling and discharging curves should be consistent, or the error should be small. If the error is large, it is necessary to calibrate the water again for curve fitting, and then compare it with the last water calibration curve.

[0082] If the deionized water source is high on site, it can flow into the first storage tank by gravity, that is, the deionized water enters the metering module from inlet 2, passes through the fifth remote control valve A-BD005VV, flowmeter BD001MD, and second remote control valve A-BD002VV, and then flows into the first storage tank through outlet 1. During this process, the pump BD-001PO, the first remote control valve A-BD001VV, the third remote control valve A-BD003VV, the fourth remote control valve A-BD004VV, and the manual valve M-BD001VV are closed.

[0083] If you proceed as Figure 2 In the double tank calibration shown, the related medium flow direction circuit in the metering module does not need to be changed, and the calibration flowmeter shares one. It is only necessary to send the signals of the main body level gauge of the other target tank to be calibrated and the newly added calibration level gauge to the operation and display module for data recording. In other words, in addition to recording the data trends of the main body level gauge of the first tank, the first calibration level gauge, and the flowmeter BD001MD, the operation and display module also records and stores the data trends of the main body level gauge of the second tank and the second calibration level gauge. The data processing process is the same as the single tank calibration process.

[0084] Abnormal working condition handling:

[0085] During the calibration process, if the absolute value of the deviation between the first tank body level gauge and the calibration level gauge exceeds the acceptable range value δ, the calibration will be automatically suspended. At this time, the calibration personnel will determine whether to continue the calibration work or continue the calibration work after inspecting and repairing the level gauge.

[0086] The calibration can be paused or terminated at any time during the calibration. After the calibration is paused, it can be restarted according to the actual situation on site; the calibration is terminated when the calibration is terminated.

[0087] In case of unexpected emergency, press the emergency stop button, which will cut off the power supply to the pump and all remote control valves in the metering module to ensure safety.

[0088] To calibrate the level gauge, you can use a variety of level gauges based on different measuring principles, such as air blowing gauges, radar level gauges, ultrasonic level gauges, etc. It is best to use a level gauge that does not need to be inserted into a storage tank and has a relatively large measuring range and can be freely set.

[0089] The automatic tank liquid level calibration method of this embodiment has the following beneficial effects:

[0090] (1) The calibration process is automated, significantly reducing the amount of personnel involved in the calibration process;

[0091] (2) Automatic switching between tank filling and draining is realized, which improves calibration efficiency;

[0092] (3) It provides gravity flow calibration mode and reflux function, which is more widely used;

[0093] (4) In some cases, two tanks can be calibrated simultaneously, which improves the calibration efficiency;

[0094] (5) Dual level gauges provide redundant real-time display and interlock remote control valves and pumps to avoid overflow and ensure the safety of personnel, equipment, and plant.

[0095] (6) Real-time comparison of the two liquid level gauges. The standard liquid level gauge can be used to calibrate the liquid level gauge of the storage tank to check its error;

[0096] (7) Centralized control saves costs. The operation display module and metering module can be set near the storage tank, eliminating the cost and time of laying cables to the formal control system and moving them later, and reducing the number of people monitoring the panel in the main control room;

[0097] (8) Reduce the test data deviation caused by human error.

[0098] Embodiment 3:

[0099] This embodiment provides an electronic device, including: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the tank liquid level automatic calibration method of embodiment 2 by executing the computer instructions.

[0100] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A tank liquid level automatic calibration system, characterized in that: It includes a first calibration level meter, a metering module, and an operation and display module. The first calibration level gauge is used to measure the liquid level height of the first storage tank. The metering module is connected to the first storage tank through a pipeline, and is used to switch the calibration mode and measure the flow rate of the deionized water used for calibration. The operation and display module is connected to the first calibrated liquid level gauge, the metering module, and the first storage tank body liquid level gauge, and is used to control the switching of the calibration mode and calculate the liquid level-volume relationship of the first storage tank according to the measurement results of the first calibrated liquid level gauge, the measurement results of the metering module, and the measurement results of the first storage tank body liquid level gauge.

2. The system according to claim 1, characterized in that Also includes a second calibrated level gauge, The second calibrated level gauge is used to measure the liquid level height of the second storage tank. The metering module is connected to the second storage tank through a pipeline and is used to measure the flow rate of the calibration deionized water flowing from the first storage tank to the second storage tank. The operation display module is connected to the second calibrated liquid level gauge and the second tank body liquid level gauge, and is used to calculate the liquid level volume relationship of the second tank according to the measurement results of the second calibrated liquid level gauge, the measurement results of the metering module, and the measurement results of the second tank body liquid level gauge.

3. The system according to claim 1, characterized in that The metering module includes a first remote control valve, a pump, a flow meter, and a second remote control valve connected in series by a pipeline, wherein the first remote control valve is connected to a first inlet pipeline, and the second remote control valve is connected to a first outlet pipeline. The calibration mode includes an automatic water filling calibration mode. The operation and display module is used to control the metering module to open the first remote control valve, the pump, and the second remote control valve after the automatic water filling calibration mode is turned on, so that the deionized water flows from the first outlet pipe into the first storage tank. The operation and display module is also used to control the metering module to close the pump, the first remote control valve, and the second remote control valve when the measurement result of the first calibrated liquid level gauge or the first storage tank body liquid level gauge reaches the range threshold.

4. The system according to claim 3, characterized in that The metering module also includes a third remote control valve and a fourth remote control valve, wherein one end of the third remote control valve is connected to the first outlet pipeline, and the other end thereof is connected in series to the pipeline between the pump and the first remote control valve; one end of the fourth remote control valve is connected in series to the pipeline between the flow meter and the second remote control valve, and the other end thereof is connected to the second outlet pipeline. The calibration mode also includes an automatic drain calibration mode. The operation display module is used to control the first remote control valve and the second remote control valve of the metering module to be in a closed state after the automatic drainage calibration mode is turned on, and control the metering module to open the third remote control valve, the pump, and the fourth remote control valve, so that the deionized water flows out of the first storage tank and is discharged through the second outlet pipe. The operation and display module is also used to control the metering module to close the pump, the third remote control valve, and the fourth remote control valve when the measurement result of the first calibrated liquid level gauge or the first storage tank body liquid level gauge reaches within the zero position deviation range.

5. The system according to claim 4, characterized in that The metering module also includes a fifth remote control valve, one end of which is connected in series to the pipeline between the pump and the flow meter, and the other end of which is connected to the second inlet pipeline. The calibration mode also includes gravity flow calibration mode. The operation and display module is used to control the first remote control valve, the pump, the third remote control valve, and the fourth remote control valve to be in a closed state after the gravity self-flow calibration mode is turned on, and control the metering module to open the fifth remote control valve and the second remote control valve to allow deionized water to flow in from the second inlet pipe and flow out through the first outlet pipe.

6. The system according to claim 5, characterized in that The metering module also includes a manual valve, Manual valve, connected in series to the pipeline between the pump and the flow meter, is used for isolation in different calibration modes.

7. The system according to claim 1, characterized in that The operation and display module is also used to compare the measurement result of the first calibrated liquid level gauge with the measurement result of the first storage tank body liquid level gauge to determine the calibration error.

8. A method for automatic calibration of a tank liquid level, applied to the automatic calibration system of a tank liquid level according to any one of claims 1 to 7, characterized in that: The method comprises: Receive calibration mode command; The switching of the calibration mode is controlled according to the instruction, and the liquid level volume relationship of the first storage tank is calculated according to the measurement results of the first calibration liquid level gauge, the measurement results of the metering module, and the measurement results of the first storage tank body liquid level gauge.

9. The method according to claim 8, characterized in that The step of calculating the liquid level volume relationship of the first storage tank according to the measurement result of the first calibrated liquid level gauge, the measurement result of the metering module, and the measurement result of the first storage tank body liquid level gauge specifically includes: Determine whether the measurement result of the first calibration liquid level gauge and the measurement result of the first storage tank body liquid level gauge are less than the calibration error; In response to being less than a calibration error, determining the first calibration liquid level gauge or the first storage tank body liquid level gauge as the target liquid level gauge; In response to being greater than or equal to the calibration error, determining the first calibrated liquid level gauge as the target liquid level gauge; The measurement results of the metering module and the measurement results of the target liquid level meter are sampled and fitted and calculated to generate a liquid level-volume relationship of the first storage tank.

10. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the tank liquid level automatic calibration method according to any one of claims 8 to 9 by executing the computer instructions.

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