Chemical fuel tank volume calibration system

Abstract

The utility model relates to the technical field of volume measurement, concretely to a chemical fuel storage tank volume calibration system, include: the calibration storage tank that waits for, transportation storage module, flow statistics module, liquid level measurement module, data acquisition module and data processing module, flow statistics module is used for measuring the chemical fuel volume that transportation storage module is transported to calibration storage tank that waits for, liquid level measurement module is used for measuring the liquid level height of calibration storage tank that waits for, data acquisition module is used for gathering the real -time data of flow statistics module and liquid level measurement module, data processing module is used for the calibration of storage tank volume based on data acquisition module. The utility model carries out calibration in combination with chemical fuel warehousing process, need not specially pour jar, has saved time, manpower, avoided material loss and safety risk, has greatly promoted work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of volume measurement technology, specifically a volume calibration system for chemical fuel storage tanks. Background Technology

[0002] In the management of chemical fuel transportation and storage, timely storage after fuel arrival is a crucial step in ensuring production continuity and safety. Currently, accurate measurement of the amount of fuel entering storage mainly relies on tank level gauge readings, combined with a pre-set "level-volume" conversion table. However, during long-term service, storage tanks are continuously subjected to the gravity of the medium and the impact of fluid pressure fluctuations, inevitably resulting in slight deformation. This deformation gradually alters the actual volume distribution of the tank, causing discrepancies between the original "level-volume" conversion table data and the actual situation. This leads to inaccurate storage measurement results, causing numerous adverse effects on the company's production management, cost accounting, and resource allocation. Therefore, to ensure accurate measurement of the amount of chemical fuels such as kerosene entering storage, timely and accurate calibration of the tank volume is particularly necessary. Utility Model Content

[0003] The purpose of this utility model is to provide a chemical fuel storage tank volume calibration system in order to solve at least one of the above-mentioned technical problems.

[0004] This utility model achieves the above objectives through the following technical solutions: A chemical fuel storage tank volume calibration system includes a storage tank to be calibrated, a transportation and storage module, a flow statistics module, a liquid level measurement module, a data acquisition module, and a data processing module; The flow statistics module is used to measure the volume of chemical fuel delivered by the transport and storage module to the calibration tank; The liquid level measurement module is used to measure the liquid level height of the storage tank to be calibrated; The data acquisition module is used to collect real-time data from the flow statistics module and the liquid level measurement module; The data processing module is used to calibrate the tank volume based on the data acquisition module.

[0005] Furthermore, the flow statistics module includes: a flow measurement unit and a flow calibration unit; The flow measurement unit is used to measure the volume of chemical fuel delivered by the transport and storage module to the calibrated storage tank; The flow calibration unit is used to calibrate the data measured by the flow measurement unit.

[0006] Furthermore, the flow calibration unit includes: a weighing tank, an electronic scale, and a commutator; The commutator is used to selectively guide the liquid flowing through the flow measurement unit into the weighing tank, and the electronic scale is used to weigh the mass of the introduced liquid to achieve flow calibration based on the mass method.

[0007] Furthermore, the flow measurement unit employs an electromagnetic flow meter.

[0008] Furthermore, the inlet pipe of the storage tank to be calibrated extends downward from the top of the tank to the bottom.

[0009] Furthermore, the liquid level measurement module adopts a guided wave radar liquid level gauge with a 316L stainless steel shell.

[0010] Furthermore, the data acquisition module and the data processing module are connected via an RS-485 bus.

[0011] Furthermore, the system also includes: a temperature measurement module; The temperature measurement module is used to measure the temperature of the chemical fuel in the storage tank to be calibrated. The data acquisition module synchronously acquires data from the temperature measurement module; The data processing module performs temperature compensation correction on the "liquid level-volume" relationship based on temperature data.

[0012] The beneficial effects of this utility model are as follows: This invention integrates calibration with the chemical fuel warehousing process, eliminating the need for specialized tank transfer, saving time and manpower, avoiding material loss and safety risks, and greatly improving work efficiency. Simultaneously, the rationally designed inlet pipe ensures smooth liquid flow into the tank, reducing interference and enhancing the system's adaptability to different operating conditions.

[0013] The flow statistics module of this invention is calibrated using the mass method, and the liquid level measurement module adopts an advanced liquid level gauge to ensure data accuracy; the RS-485 bus enables stable and efficient data transmission; the added temperature measurement module can perform temperature compensation correction to eliminate the influence of temperature on volume calibration and make the calibration results more accurate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a chemical fuel storage tank volume calibration system according to one embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the application of a chemical fuel storage tank volume calibration system according to one embodiment of the present invention. Figure 3 This is a schematic diagram of a kerosene storage tank according to one embodiment of the present invention.

[0015] Among them, 10 is the transportation and storage module; 20 is the flow statistics module; 30 is the storage tank to be calibrated; 40 is the liquid level measurement module; 50 is the data acquisition module; 60 is the data processing module; and 70 is the temperature measurement module. Detailed Implementation

[0016] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the present invention, and are not intended to imply any limitation on the scope of the present invention.

[0017] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".

[0018] Example 1 Figure 1 This is a schematic diagram of a chemical fuel storage tank volume calibration system according to one embodiment of the present invention. Figure 1 As shown, according to one embodiment of the present invention, a chemical fuel storage tank volume calibration system includes: a transportation and storage module 10, a flow statistics module 20, a storage tank to be calibrated 30, a liquid level measurement module 40, a data acquisition module 50, and a data processing module 60. The flow rate statistics module 20 is used to measure the volume of chemical fuel delivered by the transport and storage module 10 to the calibrated storage tank 30; The liquid level measurement module 40 is used to measure the liquid level height of the storage tank 30 to be calibrated; The data acquisition module 50 is used to acquire real-time data from the flow statistics module 20 and the liquid level measurement module 40; The data processing module 60 is used to calibrate the tank volume based on the data acquisition module 50.

[0019] In this embodiment, a chemical fuel storage tank volume calibration system is proposed. The system consists of a transport and storage module 10, a flow statistics module 20, a tank to be calibrated 30, a liquid level measurement module 40, a data acquisition module 50, and a data processing module 60, all connected in a closed loop via pipelines, cables, and a communication bus. The outlet pipeline of the transport and storage module 10 is connected to the inlet of the flow statistics module 20 after passing through an explosion-proof solenoid valve and a filter. The outlet pipeline of the flow statistics module 20 extends downwards along the top manhole flange of the tank to be calibrated 30 to the bottom of the tank, forming a bottom static pressure liquid inlet method to avoid liquid level fluctuations caused by liquid inlet impact. The flow statistics module 20 has an integrated electromagnetic flowmeter as a flow measurement unit. Its instantaneous volumetric flow rate signal and high-frequency pulse accumulation signal are connected to the analog and high-speed counting channels of the data acquisition module 50 via shielded twisted-pair cables. The liquid level measurement module 40 uses a coaxial guided wave radar liquid level sensor. The liquid level gauge is vertically installed at the geometric center of the tank top, with its measuring rod extending 100mm from the tank bottom. The liquid level signal output by the liquid level gauge is isolated by a safety barrier and then connected to the data acquisition module 50. The data acquisition module 50 packages and uploads the real-time flow rate, cumulative volume, and liquid level height to the data processing module 60 located in the safety zone. The data processing module 60 is a host computer platform that runs volume calibration software. The software takes the two-dimensional sequence of "liquid level-cumulative flow rate" as input, uses piecewise linear interpolation to establish a volume table with 1mm intervals within the liquid level range, and compensates for liquid expansion caused by temperature changes. The data processing module 60 corrects the volume in real time and finally generates a temperature-corrected "liquid level-volume" comparison table, which is stored in the enterprise's metering database. At the same time, it outputs a PDF calibration report, thus completing the entire online, non-tipping, high-precision volume calibration process for the chemical fuel storage tank.

[0020] The chemical fuel storage tank volume calibration system proposed in this utility model achieves online, non-empty, and high-precision volume calibration of chemical fuel storage tanks through the coordinated work of various modules, and generates a temperature-corrected comparison table and calibration report.

[0021] According to one embodiment of the present invention, the flow statistics module 20 includes: a flow measurement unit and a flow calibration unit; The flow measurement unit is used to measure the volume of chemical fuel delivered by the transport and storage module 10 to the calibrated storage tank 30; The flow calibration unit is used to calibrate the data measured by the flow measurement unit.

[0022] Preferably, the flow calibration unit includes: a weighing tank, an electronic scale, and a commutator; A commutator is used to selectively direct the liquid flowing through the flow measurement unit into a weighing tank, and an electronic scale is used to weigh the mass of the introduced liquid to achieve mass-based flow calibration.

[0023] Preferably, the flow measurement unit is an electromagnetic flow meter.

[0024] In this embodiment, the flow statistics module 20 adopts an integrated "measurement-calibration" structure, consisting of a flow measurement unit and a flow calibration unit arranged in parallel. The flow measurement unit uses an electromagnetic flow meter, whose nominal diameter is consistent with the outlet pipeline of the transport and storage module 10. The electrodes and lining of the electromagnetic flow meter are made of materials resistant to chemical fuel corrosion. The instrument body is horizontally mounted on a rigid straight pipe section via a pair of ANSI RF flanges. Rectifying rings are provided upstream and downstream of the straight pipe section to ensure accuracy. The 4-20mA instantaneous flow signal and high-frequency pulse accumulation signal output by the electromagnetic flow meter are connected to the analog channel and high-speed counting port of the data acquisition module 50 via shielded cables for real-time volume measurement. The flow calibration unit is led out downstream of the electromagnetic flowmeter via a T-type bypass pipe. The bypass sequentially installs a stainless steel ball valve, a reversing valve, a weighing tank, and an electronic scale. The reversing valve is an electric three-way ball valve; upon receiving a calibration command, the valve core switches, diverting the liquid from the main pipeline to the weighing tank. The weighing tank is a sealed cylindrical container with a quick-opening inlet and vent valve at the top, and a pneumatic butterfly valve at the bottom outlet. The tank sits on a 0.1g resolution explosion-proof electronic scale. The millivolt signal from the electronic scale is converted to 4-20mA and connected to the same data acquisition module 50. At the start of calibration, the host computer first records the accumulated pulse value of the electromagnetic flowmeter, then controls the reversing valve to open the bypass, allowing liquid to enter the weighing tank. When the scale value reaches... When the first, second, and third preset weights are measured, the system sequentially reads the corresponding pulse counts and uses the mass-volume conversion formula to obtain the standard volume, thereby calculating the instrument coefficient of the electromagnetic flowmeter at the current flow point. When the relative deviation of the three measurements is ≤0.2%, the average is taken and written into the flowmeter memory to achieve closed-loop calibration. After calibration, the commutator is reset, and the liquid is discharged back to the recovery port of the transport and storage module 10 through the pneumatic butterfly valve at the bottom of the weighing tank. The entire calibration process does not require disassembly of pipelines and can be completed automatically before formal liquid injection or during liquid injection intervals, ensuring that the volume measurement data of the flow statistics module 20 is always traceable to the mass benchmark, thereby significantly improving the overall uncertainty of the tank volume calibration.

[0025] This utility model's flow statistics module adopts an integrated "measurement-calibration" structure. Through specific arrangement and operation, it can automatically complete calibration without disassembling the pipeline, ensuring that the flow measurement data is traceable to the quality benchmark and significantly improving the overall uncertainty of tank volume calibration.

[0026] According to one embodiment of the present invention, the inlet pipe of the calibration tank 30 extends downward from the top of the tank to the bottom.

[0027] Preferably, the liquid level measurement module 40 adopts a guided wave radar liquid level gauge with a 316L stainless steel housing.

[0028] Preferably, the data acquisition module 50 and the data processing module 60 are connected via an RS-485 bus.

[0029] In this embodiment, the inlet pipe of the calibrated storage tank 30 adopts a top-bottom insertion structure: a DN50, 316L stainless steel seamless pipe vertically penetrates from the center of the standard manhole flange on the top of the tank to approximately 150mm from the bottom of the tank. The pipe opening is cut at a 45° bevel and faces away from the tank wall, allowing the incoming flow to diffuse horizontally along the bottom of the tank, avoiding liquid surface impact and vortex entrainment. PTFE support rings are installed every 2m on the outer wall of the inlet pipe to prevent vibration of the long pipe during liquid inlet. The liquid level measurement module 40 uses a coaxial guided wave radar level gauge, with both the gauge head and flange made of 316L material, meeting the corrosion resistance requirements of chemical fuels. The instrument is horizontally installed at the geometric center of the tank top via the flange, and the guided wave radar outputs a 4-20mA liquid level signal. The data acquisition module 50 has a built-in RS-485 interface, isolated power supply and surge protection. It can be networked with field instruments such as guided wave radar level gauge, electromagnetic flow meter, and electronic scale via shielded twisted pair cable using Modbus-RTU protocol. The data acquisition module 50 is connected to the data processing module 60 (host computer) in the safe zone via a single shielded twisted pair cable as an RS-485 bus to complete the reliable acquisition of level and flow signals and subsequent volume calibration calculation.

[0030] This invention effectively avoids problems such as liquid surface impact by using a top-to-bottom insertable liquid inlet pipe structure for the storage tank to be calibrated, an appropriate liquid level measurement module, and a reliable communication connection, thereby meeting corrosion resistance requirements and enabling reliable acquisition of liquid level and flow signals to complete volume calibration calculations.

[0031] According to one embodiment of the present invention, the system further includes: a temperature measurement module 70; Temperature measurement module 70 is used to measure the temperature of chemical fuel inside storage tank 30 to be calibrated; Data acquisition module 50 synchronously acquires data from temperature measurement module 70; The data processing module 60 performs temperature compensation correction on the "liquid level-volume" relationship based on temperature data.

[0032] In this embodiment, the temperature measurement module 70 is integrated into the system as the core component for volumetric temperature compensation: a Pt 100A grade thin-film resistance thermometer is vertically inserted into the middle of the liquid phase zone through the top of the tank, and is equipped with a replaceable conical protective sleeve to ensure response speed and avoid mechanical damage during transportation; the resistance thermometer has a temperature range of 0-80℃, and its output current signal (4-20mA) is linearly related to the temperature of the liquid being measured. This current signal is connected to the data acquisition module 50 through a shielded twisted-pair cable. The data acquisition module 50 synchronously samples the temperature, liquid level, and cumulative flow at a fixed frequency. The sampled values ​​are digitally filtered and then uploaded to the data processing module 60 via an RS-485 bus. The data processing module 60 has a built-in temperature compensation algorithm: First, it looks up the volume expansion coefficient β of the current fuel based on the measured temperature T (β varies within a small range with the product formula, and the system allows users to enter a fixed value). Then, it corrects each set of raw "liquid level-volume" data according to the volume expansion coefficient β. The corrected volume and liquid level are refitted to generate a final volume table with 1mm intervals that includes the temperature effect, and the temperature sampling time is marked. This achieves automatic elimination of temperature errors across the entire range, ensuring that the calibration results of fuels from different seasons and batches can be traced back to a unified temperature benchmark, thereby improving the accuracy and consistency of tank volume calibration.

[0033] Example 2 Figure 2 This is a schematic diagram illustrating the application of a chemical fuel storage tank volume calibration system according to one embodiment of this utility model. Figure 2 As shown, according to one embodiment of the present invention, a chemical fuel storage tank volume calibration system can simultaneously calibrate the tank volume when kerosene enters the warehouse, without the need for special tank transfer. The system includes: a storage tank to be calibrated 30 (liquid inlet tank), a kerosene container (transport and storage module 10), and a flow meter (flow statistics module 20). The calibration tank 30 (inlet tank) is equipped with a liquid level sensor (liquid level measurement module 40) and an inlet pipe; the liquid level sensor is used to measure the liquid level height of the calibration tank 30; the inlet pipe extends from the top of the tank to the bottom to prevent liquid level fluctuations during liquid inlet.

[0034] Kerosene containers are used for transporting and storing kerosene, serving as outlet tanks in tank volume calibration systems.

[0035] The flow meter is used to dynamically measure the amount of kerosene entering the storage tank—the liquid volume. By establishing a correspondence between the liquid level sensor of the storage tank to be calibrated and the liquid volume measured by the flow meter, the "liquid level-volume" lookup table information is updated to achieve real-time calibration of the storage tank volume.

[0036] Figure 3 This is a schematic diagram of a kerosene storage tank according to one embodiment of the present invention. Figure 2-3 As shown, with 80m 3Taking kerosene storage tank volume calibration as an example, the process of calibrating the volume of a kerosene storage tank using the chemical fuel storage tank volume calibration system of this utility model includes: Step S1: Define the volume calibration interval.

[0037] 80m 3 The usable tank level range during actual kerosene filling is approximately [400, 2500] mm, while the tank volume calibration level range is [200, 2650] mm. The data processing level range is [300, 2600] mm. Level-volume values ​​below 300 mm and above 2600 mm can be calculated using theoretical formulas. Theoretical tank volume. The calculation formula is as follows: in, This refers to the liquid level height. It is the semi-minor axis of the ellipsoid of revolution; The radius of the cylindrical segment is also the semi-major axis of the ellipsoid of revolution; This is the length of the cylindrical section of the storage tank.

[0038] Step S2: Empty the remaining liquid from the inlet tank and control the height of the remaining liquid level to be no more than 300mm; Step S3: Start the system and use gas compression to transfer kerosene from the kerosene container into the kerosene storage tank. Control the flow rate at 300~500L / min to ensure a steady rise in the tank level and prevent level fluctuations. Step S4: During the transfer, the level sensor and flow meter keep counting and record the liquid level height at each moment. and flow meter cumulative volume Establish liquid level height Correspondence with the cumulative amount of the flow meter ; The PLC (data acquisition module 50) collects real-time data from the level sensor and flow rate and transmits it to the PC (data processing module 60) for processing. Step S5: The PC processes the obtained data, and the formula for calculating the tank's "liquid level - volume" V (h) is as follows: Step S6: Based on the formula in step S5, the calibrated tank "level-volume" table can be obtained. Then, the data table is converted into a database and entered into the PC to complete the tank volume calibration.

[0039] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0040] It should be understood that the sequence number of each step in the utility model content and embodiments does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the utility model embodiments.

Claims

1. A chemical fuel storage tank volume calibration system, comprising a storage tank (30) to be calibrated, characterized in that, The system also includes: a transport and storage module (10), a flow statistics module (20), a liquid level measurement module (40), a data acquisition module (50), a data processing module (60), and a temperature measurement module (70). The flow statistics module (20) is used to measure the volume of chemical fuel delivered by the transport and storage module (10) to the calibration tank (30); The liquid level measurement module (40) is used to measure the liquid level height of the storage tank (30) to be calibrated; The data acquisition module (50) is used to acquire real-time data from the flow statistics module (20) and the liquid level measurement module (40); The data processing module (60) is used to calibrate the tank volume based on the data acquisition module (50); The temperature measurement module (70) is used to measure the temperature of the chemical fuel in the calibrated storage tank (30); The data acquisition module (50) synchronously acquires data from the temperature measurement module (70); The data processing module (60) performs temperature compensation correction on the "liquid level-volume" relationship based on temperature data.

2. The chemical fuel storage tank volume calibration system according to claim 1, characterized in that, The flow statistics module (20) includes: a flow measurement unit and a flow calibration unit; The flow measurement unit is used to measure the volume of chemical fuel delivered by the transport and storage module (10) to the calibration tank (30); The flow calibration unit is used to calibrate the data measured by the flow measurement unit.

3. The chemical fuel storage tank volume calibration system according to claim 2, characterized in that, The flow calibration unit includes: a weighing tank, an electronic scale, and a commutator; The commutator is used to selectively guide the liquid flowing through the flow measurement unit into the weighing tank, and the electronic scale is used to weigh the mass of the introduced liquid to achieve flow calibration based on the mass method.

4. The chemical fuel storage tank volume calibration system according to claim 2, characterized in that: The flow measurement unit uses an electromagnetic flow meter.

5. The chemical fuel storage tank volume calibration system according to claim 1, characterized in that: The inlet pipe of the calibration tank (30) extends from the top of the tank downwards to the bottom.

6. The chemical fuel storage tank volume calibration system according to claim 1, characterized in that: The liquid level measurement module (40) uses a guided wave radar liquid level gauge with a 316L stainless steel shell.

7. The chemical fuel storage tank volume calibration system according to claim 1, characterized in that: The data acquisition module (50) and the data processing module (60) are connected via an RS-485 bus.

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