Horizontal storage tank capacity calibration control method and system

Abstract

This invention discloses a horizontal storage tank capacity calibration control method and system. It addresses the problems of existing calibration systems, such as significant differences between systems, lack of cross-compatibility, poor adaptability to storage tank calibration operations, lack of liquid level correction leading to capacity data deviations and inaccuracies, and the failure of water level gauge systems to consider tank cleaning components, resulting in delayed water removal after calibration and affecting subsequent use. The system includes a cursor component, a water level gauge component, a first liquid level gauge, a second liquid level gauge, and a controller. The method involves correcting the liquid level for both the cursor method and the water level gauge method; setting a first calibration method and a second calibration method; and calibrating the storage tank capacity using a single or cross-calibration method based on the control. This invention implements multiple measurement methods, adapting to different calibration needs, and solves the control compatibility problem between the cursor method and the water level gauge method. It achieves liquid level correction for both the cursor method and the water level gauge method, and realizes the tank cleaning function.

Description

Technical Field

[0001] This invention relates to the field of tank measurement technology, and in particular to a method and system for calibrating and controlling the capacity of a horizontal storage tank. Background Technology

[0002] Horizontal storage tanks are generally made of metal (also known as horizontal metal tanks), installed above ground or underground, and used to store fuels such as gasoline, diesel, and kerosene, or other chemicals. They are also used for measuring usage. Measuring usage is achieved by consulting the tank capacity table of the horizontal storage tank. To accurately determine the liquid capacity corresponding to different liquid levels in the horizontal storage tank, capacity calibration is required to obtain the tank capacity table. Capacity calibration is mainly carried out according to JJG 266-2018 "Verification Procedure for the Capacity of Horizontal Metal Tanks". The calibration methods specified in the procedure include the capacity comparison method, manual geometric measurement method, and photoelectric geometric measurement method, each implemented by different control systems.

[0003] Among them, capacity comparison can be divided into water calibration method and oil calibration method according to different calibration media. The water calibration method has the advantages of high accuracy, negligible influence of tank deformation, accurate calibration of tank bottom volume, and good work safety; however, it has problems such as complex operation and control, and excessive calibration time, and the work efficiency often cannot meet customer needs. Manual geometric measurement method, also known as the dimension method, generally requires operators to enter the tank for measurement for buried or semi-buried tanks. It has the advantage of fast measurement speed; however, it has problems such as low accuracy, tank explosion-proof process limitations, and personnel safety issues. Photoelectric geometric measurement method, also known as the cursor method, has the advantages of fast measurement speed, moderate accuracy, and small amount of liquid at the bottom of the tank does not affect the calibration; however, it has problems such as large fitting error of the tank bottom volume (generally the capacity corresponding to less than 3% of the total height H of the tank) and reduced tank capacity accuracy when there are many obstacles in the tank. At present, the control systems of various calibration methods are designed according to their respective calibration methods. The hardware components, working principles, working processes, calculation principles, and operating software used are completely different. Therefore, the various calibration methods cannot be cross-referenced or compatible, and have poor adaptability to horizontal storage tank calibration business.

[0004] Because the bottom of a horizontal storage tank is uneven, the vertical diameter of the tank measured at different locations will vary. Therefore, the liquid level should be based on the liquid level data at the metering reference point of the horizontal storage tank. However, most calibration methods and control systems do not correct for the measured liquid level, resulting in deviations in the tank capacity data and making it difficult to guarantee accuracy.

[0005] In addition, the existing water calibrator control system does not take into account the tank cleaning problem. After calibration, the water left in the tank cannot be cleaned in time, which affects the subsequent use of the storage tank. If it is discharged directly outside the tank, it will also pollute the surrounding environment. Summary of the Invention

[0006] This invention primarily addresses the problems of significant differences between various existing calibration systems, making cross-compatibility impossible and resulting in poor adaptability to horizontal storage tank calibration operations; the lack of liquid level correction for measured liquid levels in existing calibration systems, leading to capacity data deviations and difficulty in guaranteeing accuracy; and the failure of tank cleaning components in water-based calibration control systems, resulting in the inability to promptly clean water after calibration, affecting subsequent use, and causing environmental pollution through direct discharge. The invention provides a horizontal storage tank capacity calibration control method and system.

[0007] The above-mentioned technical problems of the present invention are mainly solved by the following technical solution: a horizontal storage tank capacity calibration and control method, comprising the following process:

[0008] Correct the liquid level height for both the cursor method and the water level method;

[0009] Set a first calibration method and a second calibration method. According to the control, the storage tank capacity is calibrated by a single calibration method or a cross calibration method. The first calibration method and the second calibration method are set according to the cursor method and the water level method. The first calibration method can be set as the cursor method or the water level method, and the second calibration method can be set as the water level method or the cursor method.

[0010] The cross-calibration method includes dividing the tank height into at least two measurement segments, alternately using a first calibration method and a second calibration method to calibrate the capacity of each measurement segment, and combining the capacity data from each measurement segment to obtain the tank capacity. Alternatively, when dividing the tank height into two measurement segments, a partial substitution calibration method is used, where capacity data obtained using one calibration method is partially replaced with capacity data obtained using another calibration method. When the tank height is divided into two or more measurement segments, an alternating synthesis calibration method is used, where different calibration methods are alternately used to obtain capacity data across multiple measurement segments, and then the capacity data from each measurement segment is combined to obtain a complete capacity dataset.

[0011] This invention achieves liquid level height correction using both the cursor method and the water level gauge method, resulting in higher accuracy of the detected volume data. It allows for the selection of a single or cross-calibration method for volume calibration, meeting diverse calibration needs and resolving the compatibility issues between the cursor and water level gauge methods. By employing a cross-calibration method, volume data is obtained by substituting or synthesizing data from the cursor and water level gauge methods, overcoming the inability to simultaneously achieve both accuracy and efficiency, and the inability to conduct calibration collaboratively using these two methods. This facilitates comparisons between various calibration methods or meets specific calibration requirements.

[0012] As a preferred embodiment, the cursor method for correcting liquid level includes:

[0013] The liquid level measurements at the first and second heights were obtained using the cursor method.

[0014] Acquire laser beam images at the first and second heights. The images include laser points and level gauge scale lines. Draw a straight line perpendicular to the level gauge scale lines through the center of the laser points. The value at the intersection of the straight line and the scale lines is used as the calculated level values ​​at the first and second heights.

[0015] The calculated and measured values ​​of the liquid level at the first and second heights are subtracted respectively. The subtractions are then added together and averaged to obtain the liquid level height correction value using the cursor method.

[0016] The liquid level height value obtained by the cursor method is supplemented with a correction value to obtain the corrected liquid level height value.

[0017] This solution corrects the liquid level measured by the cursor method, thereby improving the accuracy of the measured tank capacity data.

[0018] As a preferred embodiment, the water level correction method includes:

[0019] The liquid level measurements at the first and second heights are obtained using two level gauges, respectively.

[0020] The two liquid level measurements are subtracted from the first and second height measurements to obtain the first height liquid level correction value and the second height liquid level correction value.

[0021] The water level correction value is obtained by adding the first height liquid level correction value and the second height liquid level correction value and averaging them.

[0022] The liquid level height value obtained by the water level method is supplemented with a correction value to obtain the corrected liquid level height value.

[0023] This solution improves the accuracy of tank capacity measurements by correcting the liquid level height measured using the water level gauge method.

[0024] As a preferred embodiment, the cross-calibration method specifically includes:

[0025] The height of the storage tank is divided into two measurement sections;

[0026] The first calibration method is used to calibrate the capacity of the storage tank, and the second calibration method is used to calibrate the capacity of the maximum measurement range, including one of the measurement sections.

[0027] The capacity data of the measurement segment is obtained from the data measured by the second calibration method. The capacity data of the corresponding measurement segment measured by the first calibration method is replaced with the capacity data of the measurement segment measured by the second calibration method to obtain the final tank capacity data.

[0028] This scheme employs a partial substitution method for capacity calibration. The tank capacity data is obtained using a first calibration method, and one measurement segment is replaced with capacity data obtained using a second calibration method. The first calibration method can be either the cursor method or the water level method, and the second calibration method is the corresponding water level method or cursor method.

[0029] As a preferred embodiment, the cross-calibration method specifically includes:

[0030] The height of the storage tank is measured in multiple segments, with the number of segments being two or more.

[0031] The first and second calibration methods are used alternately to calibrate the capacity of the measurement section in sequence, and the capacity data of each measurement section is obtained. The capacity data of each measurement section are then combined to form the final tank capacity data.

[0032] This scheme uses an alternating synthesis method for capacity calibration, alternately using two calibration methods to measure the capacity of the measurement section, and finally synthesizing the capacity data of the sections into a complete tank capacity data.

[0033] As a preferred approach, the single-pointer method for tank capacity calibration also includes a follow-up verification step, the process of which includes:

[0034] Set a first liquid level and a second liquid level, and calibrate the capacity between the first liquid level and the second liquid level using the cursor method and the water level method;

[0035] Obtain the volume value data columns for the range between the first and second liquid levels using the cursor method and the water level method, respectively;

[0036] A verification threshold is set. For each volume data point at the same liquid level, the corresponding volume data using the cursor method is subtracted from the volume data using the water level marker method. The absolute value of the difference, divided by the maximum volume value, is compared with the verification threshold. If the difference is not greater than the threshold, the cursor method calibration is considered successful. This scheme uses the water level marker method to follow the cursor method for calibration, instantly verifying the accuracy of the cursor method calibration.

[0037] A horizontal storage tank capacity calibration control system includes a cursor component, a water level indicator component, a first level gauge, a second level gauge, and a controller. The cursor component, the first level gauge, and the second level gauge are respectively installed in the storage tank via connectors. The water level indicator component includes a water inlet channel and a water outlet channel. The cursor component, the water level indicator component, the first level gauge, and the second level gauge are respectively connected to the controller for control.

[0038] This invention calibrates tank capacity by controlling the switching between a cursor component and a water level indicator component, enabling multiple measurement methods to adapt to different calibration needs and solving the control compatibility problem between the cursor method and the water level indicator method. This invention achieves level height correction for both the cursor method and the water level indicator method through the design of a first level gauge, a second level gauge, and a cursor device. It features a drainage channel, enabling pollution-free tank cleaning operations. The connector is located on the ground and consists of a support column, a retractable clamp, a drive motor, and a fixing device. The support column reliably supports the connector on the ground, the retractable clamp holds the component, and its extension and retraction are controlled by the drive motor to insert or remove the component into the tank, where it is fixed by the fixing device. One or more connectors can be installed. The main body of the first level gauge is a depth measuring steel tape measure used to measure the level height at the tank's measurement reference point and to correct the level height data during the cursor method or water level indicator method measurement process. The controller collects the status information of each component, controls the actions of each component, and completes the entire tank capacity calibration process.

[0039] As a preferred embodiment, the water level indicator component includes a water level indicator, a first tee pipe, a second tee pipe, a third tee pipe, a flow valve, an air degassing rectifier, a water pump, a filter, and a liquid source device. The water inlet channel structure includes the water level indicator outlet connected to the first interface of the first tee pipe, the first tee pipe third interface connected to a water pipe, the water pipe being raised and lowered within the storage tank via a connector, the water level indicator inlet connected to the flow valve outlet, the flow valve inlet connected to the air degassing rectifier outlet, the air degassing rectifier inlet connected to the first interface of the second tee pipe, the second tee pipe third interface connected to the water pump outlet, the water pump inlet connected to the filter outlet, the filter inlet connected to the third interface of the third tee pipe, and the third tee pipe first interface connected to the liquid source device output end. The drainage channel structure includes a water pipe connected to the third interface of the first tee pipe, the first tee pipe second interface connected to the second interface of the third tee pipe, the third tee pipe third interface connected to the filter inlet, the filter outlet connected to the water pump inlet, the water pump outlet connected to the third interface of the second tee pipe, and the second tee pipe second interface connected to the liquid source device input end. The three-way pipe has three ports, two of which are equipped with solenoid valves. The flow path is changed by controlling the opening and closing of these two solenoid valves. In this design, solenoid valves are installed at the first and second ports. The connection between the two ports of the three-way pipe mentioned in the water inlet and drainage channels indicates that a flow path is formed between the two ports. By controlling the opening of the first port valve and closing of the second port valve of the third three-way pipe, the opening of the first port valve and closing of the second port valve of the second three-way pipe, and the opening of the first port valve and closing of the second port valve of the first three-way pipe, the connector lowers the lower end of the water pipe until it reaches the bottom of the storage tank. At this point, a water inlet channel is formed. The water pump is started, and the water medium flows from the liquid source device through the third three-way pipe, filter, water pump, second three-way pipe, degassing rectifier, flow valve, and water level indicator. After being metered by the water level indicator, it enters the storage tank through the first three-way pipe. After measurement, the storage tank is cleaned. This is achieved by controlling the first and second ports of the third three-way pipe to be closed and open, respectively, and vice versa. This creates a drainage channel. The water pump is then started, and water flows from the storage tank through the first and third three-way pipes, the filter, the pump, and the second three-way pipe to the liquid source unit. Pumping continues until all water in the storage tank is emptied. The first, second, and third three-way pipes, flow valves, degassing rectifier, pump, and filter are all controlled by a controller. The water level indicator components in this design also have a drainage function, allowing for timely cleaning of the storage tank without affecting its subsequent use. The discharged water, after entering the liquid source unit, can be transported by vehicle to a designated location for treatment, or treated through a dedicated wastewater treatment system before being discharged or reused. This design combines inlet and outlet piping, using a single pump to complete both capacity calibration and tank cleaning. The structure is simple, reasonable, and cost-effective. The filter is used to remove impurities from the medium. The degassing rectifier is used for rectification and degassing, reducing flow field turbulence and the impact of gas-liquid two-phase flow on the accuracy of the water level indicator. The flow valve is used to adjust the calibrated flow rate.The liquid source device serves as a temporary storage and collection container for calibration media and for tank cleaning. It can be a vehicle-mounted container, a fixed on-site container, or other containers with similar functions.

[0040] As a preferred embodiment, the cursor component includes a cursor sensor, a guide rod, and a camera. The cursor sensor is connected to the guide rod via a motor drive, and the camera is mounted on the cursor sensor. The first level gauge includes a scale, and a laser imaging plate is installed within a height range (referred to as the verification position) set on the scale. In this embodiment, the cursor sensor is the core of the cursor component. The cursor sensor has a built-in laser emitter and obtains various geometric parameters inside the storage tank through laser ranging and grating angle measurement principles. The guide rod is a vertical metal rod, and its lower end is located at the measurement point at the bottom of the storage tank during operation. The cursor sensor can move up and down along the guide rod under the action of its built-in motor. The cursor sensor has a data storage device for storing cursor measurement data and transmitting it back to the controller. The camera is mounted near the laser emitter of the cursor sensor. The camera has a resolution of no less than 10 million pixels and can take pictures of the verification position of the first level gauge to reflect the difference between the liquid level height at the measurement point and the liquid level height at the measurement reference point. The guide rod is mounted on a connector and can be raised and lowered into the storage tank. A laser imaging plate is installed on the first level gauge to receive the laser point from the cursor sensor and create an image.

[0041] As a preferred embodiment, the system also includes a first thermometer, a second thermometer, and a third level gauge. The first thermometer is installed inside the storage tank, the second thermometer is installed inside the water level indicator, and the third level gauge is installed inside the liquid source container. The first thermometer measures the air temperature or water temperature inside the storage tank, and the second thermometer measures the liquid temperature in the water level indicator. The third level gauge is located at the top of the inner wall of the liquid source container and indicates the liquid level. When the liquid level reaches the upper threshold, the system will issue an alarm to indicate that the liquid source container is full.

[0042] Therefore, the advantages of this invention are: it achieves liquid level height correction using both the cursor method and the water level gauge method, resulting in smaller deviations and higher accuracy in the detected volume data. It allows for the selection of a single or cross-calibration method for volume calibration, meeting diverse calibration needs and resolving the compatibility issues between the cursor and water level gauge methods. By employing a cross-calibration method, volume data is obtained by substituting or synthesizing data from the cursor and water level gauge methods, thus solving the problem of the inability to simultaneously achieve both accuracy and work efficiency, and the inability to conduct calibration collaboratively using both methods. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the system of the present invention. Detailed Implementation

[0044] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0045] Example 1:

[0046] This embodiment describes a horizontal storage tank capacity calibration control system. For example... Figure 1 As shown, the system includes a cursor component, a water level indicator component, a first level gauge YW1, a second level gauge YW2, and a controller KZ. The cursor component, the first level gauge, and the second level gauge are respectively installed and raised within the storage tank via connector LJ. The water level indicator component includes an inlet channel and a drain channel. The cursor component, the water level indicator component, the first level gauge, and the second level gauge are respectively connected to the controller for control.

[0047] The cursor component includes a cursor unit GBQ, a guide rod, and a camera. The cursor unit is connected to the guide rod and is driven by a motor. The cursor unit has a built-in laser emitter, and the camera is positioned on the cursor unit near the laser emitter. The guide rod is connected to a connector. During operation, the connector lowers the guide rod into the storage tank, with the lower end of the guide rod resting against the first measuring point CL1 at the bottom of the tank.

[0048] The first level gauge includes a scale, and a laser imaging plate is installed within a set height range on the scale. Since the cursor needs to be detected at 200mm and 400mm, the set height range is from 150mm to 450mm from the bottom of the first level gauge. A rectangular laser imaging plate with a width of 400mm and a height of 300mm is installed to receive the laser points from the cursor and image them.

[0049] The water level indicator components include a water level indicator SBQ, a first tee pipe STA, a second tee pipe STB, a third tee pipe STC, a flow valve LF, an air degassing rectifier XQ, a water pump PU, a filter GL, and a liquid source device YYQ. The third port of the first tee pipe connects to a water pipe, which is connected to a connector. The lifting mechanism is located inside the storage tank. The first port of the first tee pipe connects to the outlet of the water level indicator SBQ. The water level indicator inlet connects to the outlet of the flow valve LF. The flow valve inlet connects to the outlet of the air degassing rectifier XQ. The air degassing rectifier inlet connects to the first port of the second tee pipe STB. The third port of the second tee pipe connects to the outlet of the water pump PU. The water pump inlet connects to the outlet of the filter GL. The filter inlet connects to the third port of the third tee pipe STC. The first port of the third tee pipe connects to the output of the liquid source device YYQ. The second port of the first tee pipe connects to the second port of the third tee pipe, and the second port of the second tee pipe connects to the input of the liquid source device. The first tee pipe STA, the second tee pipe STB, the third tee pipe STC, the flow valve LF, the degassing rectifier XQ, the water pump PU, and the filter GL are all connected to the controller KZ, whose operating status is controlled by the controller. The aforementioned tee pipes have three interfaces, with solenoid valves installed at the first and second interfaces. Controlling these solenoid valves controls the connection of the tee pipe interfaces. The filter is used to remove impurities from the medium. The degassing rectifier is used for rectification and degassing, reducing flow field turbulence and the impact of gas-liquid two-phase flow on the accuracy of the water level indicator. The flow valve is used to adjust the calibration flow rate. The liquid source unit serves as a temporary storage container for the calibration medium and a collection container for tank cleaning; it can be a vehicle-mounted container, a fixed on-site container, or other containers with similar functions.

[0050] The controller allows the water level indicator to form inlet and outlet channels. By controlling the opening and closing of the first and second ports of the third three-way pipe, the controller lowers the water pipe until it reaches the bottom of the storage tank. This creates the inlet channel. The water pump is then activated, and the water flows from the liquid source through the third three-way pipe, filter, pump, second three-way pipe, degassing rectifier, flow valve, and water level indicator. After measurement by the water level indicator, the water enters the storage tank through the first three-way pipe. After measurement, the tank is emptied. By controlling the closing and opening of the first and second ports of the third three-way pipe, the second three-way pipe, and the first and second ports of the second three-way pipe, the water level indicator is emptied. This creates the outlet channel. The water pump is then activated, and the water flows from the storage tank through the first and third three-way pipes, filter, pump, and second three-way pipe to the liquid source. Water is continuously pumped until all water in the storage tank is emptied.

[0051] The system also includes a first thermometer WD1, a second thermometer WD2, and a third liquid level gauge YW3. The first thermometer is installed inside the storage tank to measure the air temperature or water temperature inside the tank; the second thermometer is installed inside the water level indicator to measure the liquid temperature in the water level indicator; and the third liquid level gauge is installed inside the liquid source to indicate the liquid level height in the liquid source. When the liquid level reaches the upper limit threshold, the system will issue an alarm to indicate that the liquid source is full.

[0052] Connector LJ is located on the ground. The connector consists of a support column, a telescopic clamp, a drive motor, and a fixing device. The support column is used to reliably support the connector on the ground. The telescopic clamp can hold the component and is controlled by the drive motor to extend and retract, inserting or removing the component into or out of the tank. It is then fixed by the fixing device. One or more connectors are provided.

[0053] Cursor component measurement operation process

[0054] Insert the first level gauge YW1 into the horizontal storage tank through connector LJ until its lower apex reaches the measurement reference point JZ at the bottom of the tank, keep it vertical and fix it in place.

[0055] Insert the guide rod with the cursor into the horizontal storage tank through connector LJ until the lower apex of the guide rod reaches the measuring point CL1 at the bottom of the storage tank. Keep the guide rod vertical and fix it in place.

[0056] The cursor is set with calibration parameters, including step height and upper and lower limits of movement.

[0057] The laser emitter of the cursor is operated to emit two horizontal laser beams at vertical heights of 200mm and 400mm respectively, starting from the lower apex of the guide rod. The laser beam spots are projected onto the laser imaging plate of the first level gauge YW1, and the camera is controlled to capture two clear images, which are then sent back to the controller. The level value is calculated based on the two images, and then combined with the level value obtained from the cursor, a cursor-based level height correction is performed.

[0058] The data inside the storage tank is scanned layer by layer and stored in the memory. The air temperature inside the storage tank is measured using the first thermometer WD1 until all the set scanning work is completed, and the data is transmitted back to the controller.

[0059] The first level gauge is raised via the connector, and the cursor guide rod is removed from the horizontal storage tank, completing the cursor component measurement process.

[0060] Water level indicator component measurement operation process

[0061] Insert the first level gauge YW1 into the horizontal storage tank through connector LJ until its lower apex reaches the measurement reference point JZ at the bottom of the tank, keep it vertical and fix it in place.

[0062] Insert the water pipe smoothly into the horizontal storage tank using connector LJ until the lower end of the water pipe reaches the bottom of the tank.

[0063] The second level gauge YW2 is inserted into the storage tank via connector LJ and placed at the measuring point CL2 at the bottom of the tank, keeping it vertical and fixed.

[0064] A water inlet channel is formed by controlling the solenoid valves at the interfaces of the first, second, and third three-way pipes. The water pump PU is started, and the flow rate is adjusted to the set flow rate via the flow valve LF to begin calibration. The water medium flows from the liquid source YYQ through the valve-controlled third three-way pipe STC, filter GL, water pump PU, second three-way pipe STB, degassing rectifier XQ, and flow regulating valve LF, reaching the water level indicator SBQ. After being measured by the water level indicator SBQ, it flows through the first three-way pipe STA into the horizontal storage tank. The volume of water injected into the storage tank, the liquid level height measured by the second level gauge YW2, and the water medium temperature measured by the first thermometer WD1 and the second thermometer WD2 are recorded. Calibration can be performed continuously or intermittently until the entire set water level control process is completed. The controller KZ stores the relevant data from the calibration process.

[0065] The corresponding liquid level heights were measured using the first liquid level gauge YW1 and the second liquid level gauge YW2 at liquid level heights of approximately 200 mm and 400 mm, respectively, and the liquid level height was corrected using the water level gauge method.

[0066] After measurement, a tank cleaning operation is performed. A drainage channel is formed by controlling the solenoid valves at the interfaces of the first, second, and third tee pipes. The water pump PU is started, and water flows from the horizontal storage tank through the valve-controlled first tee pipe STA, third tee pipe STC, filter GL, water pump PU, and second tee pipe STB to the liquid source unit YYQ. Water can be continuously pumped until all water in the horizontal storage tank is emptied.

[0067] Wastewater collected in the YYQ liquid source can be transported by vehicle to a designated location for treatment, or it can be treated harmlessly through a dedicated wastewater treatment system before being discharged or reused.

[0068] The third level gauge, YW3, is located at the top of the inner wall of the liquid source tank YYQ. It is used to indicate the liquid level height of the liquid source tank YYQ. When the set upper limit threshold is reached, the controller KZ will issue an alarm, indicating that the liquid source tank YYQ is full. At this time, the tank cleaning operation must be stopped, and the water in the liquid source tank must be discharged in a harmless manner before continuing the tank cleaning operation.

[0069] The first level gauge, water pipe, and second level gauge are lifted out of the horizontal storage tank via connector LJ to complete the water level gauge component testing process.

[0070] The controller allows for cross-control of the cursor and watermark components for measurement.

[0071] Example 2:

[0072] This embodiment describes a method for calibrating and controlling the capacity of a horizontal storage tank, implemented using the system described in Embodiment 1. It includes the following processes:

[0073] Correct the liquid level height for both the cursor method and the water level method;

[0074] The specific steps of the cursor method for correcting liquid level include:

[0075] The first height of 200mm, YWa, and the second height of 400mm, YWb were obtained using the cursor method.

[0076] Acquire laser beam images at the first and second heights. The images include laser points and level gauge scale lines. Draw a straight line perpendicular to the level gauge scale lines through the center of the laser points of the cursor. The value at the intersection of the straight line and the scale lines is used as the calculated value YW1a for the first height and YW1b for the second height.

[0077] The calculated and measured values ​​for the first and second altitudes were subtracted respectively.

[0078] Δ1 = YW1a - YWa,

[0079] Δ2 = YW1b - YWb,

[0080] The values ​​are subtracted, summed, and averaged to obtain the corrected liquid level height value using the cursor method.

[0081] Δ = (Δ1 + Δ2) / 2;

[0082] When generating a container capacity table using the cursor method, the obtained cursor method liquid level height h' must be corrected to h before use, h = h' + Δ.

[0083] The water level correction method specifically includes:

[0084] The liquid level measurements YW1c, YW2c, YW1d, and YW2d at a first height of 200mm and a second height of 400mm are obtained by the first liquid level gauge and the second liquid level gauge, respectively.

[0085] Based on the difference between the corresponding measured values ​​of the two level gauges at the first and second heights, respectively, the liquid level correction values ​​at the first and second heights are obtained.

[0086] Δ3 = YW1c - YW2c

[0087] Δ4 = YW1d - YW2d,

[0088] The average of the first and second height liquid level correction values ​​is used to obtain the water level correction value using the water level gauge method.

[0089] Δ = (Δ3 + Δ4) / 2.

[0090] When generating a tank capacity table using the water level gauge method, the water level height H' is corrected to H before use, where H = H' + Δ.

[0091] Establish a first calibration method and a second calibration method, and apply a single calibration method or a cross calibration method to calibrate the capacity of the storage tank according to the control.

[0092] The first calibration method and the second calibration method are set according to the cursor method and the watermark method. The first calibration method can be set as the cursor method or the watermark method, and the second calibration method can be set as the watermark method or the cursor method.

[0093] The single calibration method refers to using one calibration method to complete the calibration and control of all storage tank capacities. The cursor method is suitable when capacity accuracy requirements are not high, rapid testing is needed, the tank's internal shape is relatively regular, and water cannot be injected into the tank. The water level method is suitable when capacity accuracy requirements are high, the testing period is ample, the tank is severely deformed, or there are many accessories.

[0094] The single-cursor method for tank capacity calibration also includes a follow-up verification step, the process of which includes:

[0095] Set a first liquid level and a second liquid level, and calibrate the capacity between the first liquid level and the second liquid level using the cursor method and the water level method;

[0096] For example, starting from Z1%H, within the range of (Z1%~Z2%)H, both the cursor method and the water level method are used simultaneously for tank capacity calibration. Since the cursor method is faster, the water level method essentially "follows" the cursor method's calibration, thus not affecting the implementation of the water level method. Theoretically, 0<=Z1<=100, 0<=Z2<=100, and Z1 <Z2。

[0097] Obtain the volume value data columns for the range between the first and second liquid levels using the cursor method and the water level method, respectively;

[0098] V 1=( V 1-1 , V 1-2 , V 1-3 ,…, V 1-m )

[0099] V 2=( V 2-1 , V 2-2 , V 2-3 ,…, V2-m )

[0100] In the formula: V 1. V 2 are the tank volume data sets in the range of (Z1%~Z2%)H, respectively, obtained by the cursor method and the water level method; V 1-1 , V 1-2 , V 1-3 ,…, V 1-m , V 2-1 , V 2-2 , V 2-3 ,…, V 2-m These are the specific capacity data corresponding to the typical liquid level heights within the range of (Z1%~Z2%)H using the cursor method and the water level method, respectively, totaling m data.

[0101] A verification threshold is set, which is 0.3% in this embodiment. The corresponding cursor method capacity data is subtracted from each water level method capacity data at the same liquid level height. The absolute value of the difference divided by the maximum capacity is compared with the verification threshold. If it is not greater than the verification threshold, the cursor method verification is determined to be successful.

[0102] Determine whether the condition is met.

[0103] |( V 2-m - V 1-m ) / V n |≤0.3%, of which V n Let m be the maximum capacity of the storage tank, where m = 1, 2, 3, ...

[0104] If the conditions are met, the verification passes.

[0105] The cross-calibration method involves dividing the tank height into at least two measurement segments, cross-calibrating the capacity of each measurement segment using the first and second calibration methods, and combining the capacity data of each measurement segment to obtain the tank capacity.

[0106] The first type specifically includes:

[0107] Dividing the tank height into two measurement segments is known as using a partial substitution method for capacity calibration.

[0108] The first calibration method is used to calibrate the capacity of the storage tank, and the second calibration method is used to calibrate the capacity of the maximum measurement range, including one of the measurement sections.

[0109] For example, the cursor method can be used as the first calibration method to complete the tank capacity calibration within the range of (0–100%)H; the water level method can be used as the second calibration method to complete the tank capacity calibration within the range of (0–P%)H; and the tank capacity data within the corresponding range of the cursor method can be replaced with the tank capacity data within the range of (0–M%)H of the water level method as needed. Similarly, the water level method can be used as the first calibration method and the cursor method as the second calibration method, with the same process as above.

[0110] In the local substitution method: theoretically, 0 <= P <= 100, 0 <= M <= 100, and M <= P; in practice, the typical application is 5 <= P <= 8, 3 <= M <= 5. For example, the cursor method can be used to complete the tank capacity calibration within the range of (0~100%) H; the water level method can be used to complete the tank capacity calibration within the range of (0~5%) H; and the tank capacity data within the range of (0~3%) H obtained by the cursor method can be replaced by the data obtained by the water level method.

[0111] Let the liquid level height data of the first calibration method be as follows: h 1. h 2、…、 h m … h n ( m The serial number corresponding to the maximum liquid level height M%H of the data to be used in the second calibration method; n (This refers to the serial number corresponding to the maximum measured liquid level height in the first calibration method), and the corresponding capacity data are as follows: v 1. v 2、…、 v m … v n The liquid level height data for the second calibration method are as follows: H 1. H 2、…、 H m … H p ( p (The serial number corresponding to the maximum measured liquid level height P%H in the second calibration method) and the corresponding capacity data are as follows: V 1. V 2、…、 V m … V p The liquid level height data point is still used. h series: h 1. h 2、…、 h m … h n .

[0112] The capacity data of the measurement segment is obtained from the data measured by the second calibration method. The capacity data of the corresponding measurement segment measured by the first calibration method is then replaced with the capacity data measured by the second calibration method for that segment to obtain the final tank capacity data. This corresponds to the set of tank capacity data. V The calculation formula is:

[0113] V =( V 1, V 2,… V m , v’ m+1 , v’ m+2 ,… v’ n-1 , v’ n )

[0114] in:

[0115] v’ m+1 = v m+1 +( V m - v m )

[0116] v’ m+2 = v m+2 +( V m - v m )

[0117] ...

[0118] v’ n-1 = v n-1 +( V m - v m )

[0119] v’ n = v n +( V m - v m ).

[0120] The second specific category includes:

[0121] The tank height is measured in multiple segments, with two or more segments; this is known as the alternating synthesis method for capacity calibration.

[0122] The first and second calibration methods are used alternately to calibrate the capacity of the measurement segment in sequence, and the capacity data of each measurement segment is obtained.

[0123] For example, the water level gauge method is used as the first calibration method to complete the tank capacity calibration within the range of (0~Z1%)H. Then, the water level gauge method is used to clean the tank, lowering the water level to Z1%*95%*H. Starting from Z1%, the cursor method is used as the second calibration method to complete the tank capacity calibration within the range of (Z1%~Z2%)H. Continuing, starting from Z2%, the water level gauge method is used to fill the tank, raising the water level from Z1%*95%*H to Z2%H, and the water level gauge method is used to complete the tank capacity calibration within the range of (Z2%~Z3%)H. The water level gauge method is then used to clean the tank, lowering the water level to Z3%*95%*H. Starting from Z3%, the cursor method is used to complete the tank capacity calibration within the range of (Z3%~Z4%)H… and so on, until the entire calibration process is completed. Alternatively, the cursor method can be used as the first calibration method, and the water level gauge method as the second calibration method; the specific method is similar to the above.

[0124] The capacity data from each measurement segment are combined to form the final tank capacity.

[0125] V =( V a1 , V b1 , V a2 , V b2 ,…, V an , V bm )

[0126] in, V a1 , V a2 , …, V an For the first calibration method n Set of tank capacity data for segment calibration operation; V b1 , V b2 , …, V bm For the second calibration method m The set of tank capacity data for segment calibration operation; m=n or m=n-1; V Data from the tank capacity of each segment V an ,V bm Alternating synthesis of tank volume data sets.

[0127] V a1 =( V a1-1 , V a1-2 , V a1-3 ,…, V a1-p1 )

[0128] V a2 =( V a2-1 , V a2-2 , V a2-3 ,…, V a2-p2 )

[0129] …

[0130] V an =( V an-1 , V an-2 , V an-3 ,…, V an-pn ),

[0131] in V an-pn This refers to the pn-th capacity value data in the n-th calibration operation of the first calibration method.

[0132] V b1 =( V b1-1 , V b1-2 , V b1-3 ,…, V b1-q1 )

[0133] V a2 =( V b2-1 , V b2-2 , V b2-3 ,…, V b2-q2 )

[0134] …

[0135] V bm =( V bm-1 , V bm-2 , V bm-3 ,…, V bm-qm ),

[0136] in V bm-qm This refers to the qm-th capacity value data in the m-th calibration operation of the second calibration method.

[0137] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A method for controlling calibration of a horizontal storage tank volume, the method comprising: The process includes the following: ​ Correct the liquid level height for both the cursor method and the water level method; The cursor method includes: obtaining the imaging position of the laser beam on the scale line of the liquid level gauge to determine the liquid level calculation value, and then combining the measured value to determine the liquid level height correction value; the water level gauge method includes: obtaining the difference between the measured values ​​of two liquid level gauges at the same height to determine the liquid level height correction value. Set a first calibration method and a second calibration method. The first calibration method is set as the cursor method or the water level method, and the second calibration method is set as the water level method or the cursor method. The storage tank capacity is calibrated by single or cross calibration method according to the control. The cross-calibration method includes dividing the tank height into at least two measurement segments, cross-calibrating the capacity of each measurement segment using the first calibration method and the second calibration method, and combining the capacity data of each measurement segment to obtain the tank capacity.

2. The method of claim 1, wherein the method further comprises: The aforementioned cursor-based liquid level correction includes: The first and second height measurements were obtained using the cursor method. Acquire laser beam images at the first and second heights. The images include laser points and level gauge scale lines. Draw a straight line perpendicular to the level gauge scale lines through the center of the laser points. The value at the intersection of the straight line and the scale lines is used as the calculated level values ​​at the first and second heights. The calculated and measured values ​​of the liquid level at the first and second heights are subtracted respectively. The subtractions are then added together and averaged to obtain the corrected liquid level height value using the cursor method. The liquid level height value obtained by the cursor method is supplemented with a correction value to obtain the corrected liquid level height value.

3. A control method for calibrating the capacity of a horizontal storage tank according to claim 2, characterized in that The water level correction method includes: The liquid level measurements at the first and second heights are obtained using two level gauges, respectively. The two liquid level measurements are subtracted from the first and second height measurements to obtain the first height liquid level correction value and the second height liquid level correction value. The water level correction value is obtained by adding the first height liquid level correction value and the second height liquid level correction value and averaging them. The liquid level height value obtained by the water level method is supplemented with a correction value to obtain the corrected liquid level height value.

4. The method for calibrating and controlling the capacity of a horizontal storage tank according to claim 3, characterized in that: The aforementioned cross-calibration method specifically includes: The height of the storage tank is divided into two measurement sections; The first calibration method is used to calibrate the capacity of the storage tank, and the second calibration method is used to calibrate the capacity of the maximum measurement range, including one of the measurement sections. The capacity data of the measurement segment is obtained from the data measured by the second calibration method. The capacity data of the corresponding measurement segment measured by the first calibration method is replaced with the capacity data of the measurement segment measured by the second calibration method to obtain the final tank capacity data.

5. The method for calibrating and controlling the capacity of a horizontal storage tank according to claim 3, characterized in that: The aforementioned cross-calibration method specifically includes: The height of the storage tank is measured in multiple segments, with the number of segments being two or more. The first and second calibration methods are used alternately to calibrate the capacity of the measurement section in sequence, and the capacity data of each measurement section is obtained. The capacity data of each measurement section are then combined to form the final tank capacity data.

6. The method for calibrating and controlling the capacity of a horizontal storage tank according to claim 1, characterized in that: The single-cursor method for tank capacity calibration also includes a follow-up verification step, the process of which includes: Set a first liquid level and a second liquid level, and calibrate the capacity between the first liquid level and the second liquid level using the cursor method and the water level method; Obtain the volume value data columns for the range between the first and second liquid levels using the cursor method and the water level method, respectively; Set a verification threshold. Subtract the corresponding cursor method capacity data from each water level method capacity data at the same liquid level height. Divide the absolute value of the difference by the maximum capacity value and compare it with the verification threshold. If it is not greater than the verification threshold, the cursor method follow verification is deemed to have passed.

7. A horizontal storage tank capacity calibration control system, applied to the method of any one of claims 1-6, characterized in that: The device includes a cursor component, a water level indicator component, a first level gauge, a second level gauge, and a controller. The cursor component, the first level gauge, and the second level gauge are respectively installed in the storage tank via connectors. The water level indicator component includes a water inlet channel and a water outlet channel. The cursor component, the water level indicator component, the first level gauge, and the second level gauge are respectively connected to the controller for control.

8. A horizontal storage tank capacity calibration control system according to claim 7, characterized in that: The water level indicator component includes a water level indicator, a first tee pipe, a second tee pipe, a third tee pipe, a flow valve, an air degassing rectifier, a water pump, a filter, and a liquid source device. The water inlet channel structure includes the water level indicator outlet connected to the first interface of the first tee pipe, the first tee pipe third interface connected to a water pipe, the water pipe being raised and lowered inside the storage tank via a connector, the water level indicator inlet connected to the flow valve outlet, the flow valve inlet connected to the air degassing rectifier outlet, the air degassing rectifier inlet connected to the first interface of the second tee pipe, the second tee pipe third interface connected to the first end of the water pump, the second end of the water pump connected to the first end of the filter, the second end of the filter connected to the third interface of the third tee pipe, and the third tee pipe first interface connected to the liquid source device output end. The drainage channel structure includes a water pipe connected to the third interface of the first tee pipe, the first tee pipe second interface connected to the second interface of the third tee pipe, the third tee pipe third interface connected to the filter inlet, the filter outlet connected to the water pump inlet, the water pump outlet connected to the third interface of the second tee pipe, and the second tee pipe second interface connected to the liquid source device input end.

9. A horizontal storage tank capacity calibration control system according to claim 8, characterized in that: The cursor component includes a cursor device, a guide rod, and a camera. The cursor device is connected to the guide rod by a motor drive, and the camera is mounted on the cursor device. The first level gauge includes a scale, and a laser imaging plate is installed within a set height range on the scale.

10. A horizontal storage tank capacity calibration control system according to claim 7, 8, or 9, characterized in that: It also includes a first thermometer, a second thermometer, and a third level gauge. The first thermometer is installed inside the storage tank, the second thermometer is installed inside the water level indicator, and the third level gauge is installed inside the liquid source device.

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