Intelligent low-temperature liquid tank car filling control system

Abstract

The invention discloses an intelligent low-temperature liquid tank car filling control system which comprises a warm liquid storage tank, an MCU controller, a mass flowmeter module, a pressure sensor module, a temperature sensor module, a liquid level sensor module, a valve control module, a frequency conversion speed regulation module, a display operation module, a safety protection module, a communication module and a power module. According to the system, the filling flow can be dynamically and accurately adjusted according to the actual state and filling requirements of the tank car, it can be ensured that the filling amount is accurate to the kilogram level regardless of tank cars of different specifications or complex and changeable filling environments, and the high-precision control capacity can be used for improving the filling efficiency of the tank car. Various problems caused by excessive or insufficient filling are effectively avoided, and the utilization rate of the low-temperature liquid is greatly increased.

Description

Technical Field

[0001] This invention relates to the field of cryogenic liquid tanker filling control system technology, specifically an intelligent cryogenic liquid tanker filling control system. Background Technology

[0002] Cryogenic liquid tank trucks are special vehicles designed to transport cryogenic liquids with a critical temperature below -50°C. Their core function is to maintain the low temperature of the liquid through high-vacuum insulation technology to prevent evaporation loss.

[0003] Filling cryogenic liquid tankers is a relatively dangerous and complex operation. Strict adherence to operating procedures is required when filling them with cryogenic liquids. Currently, most cryogenic liquid tanker filling operations still rely heavily on human operators, resulting in low automation, a higher risk of operational errors, and lower safety during filling. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing cryogenic liquid tanker filling operations still largely rely on human operators, have low intelligence, are prone to operational errors, and have low safety during filling, and to provide an intelligent control system for cryogenic liquid tanker filling.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an intelligent control system for filling cryogenic liquid tank trucks, comprising: a cryogenic liquid storage tank, an MCU controller, a mass flow meter module, a pressure sensor module, a temperature sensor module, a liquid level sensor module, a valve control module, a variable frequency speed control module, a display and operation module, a safety protection module, a communication module, and a power supply module. The filling control system includes the following steps:

[0006] S1: System startup and initialization. The mass flow meter measures the mass flow rate of the filling liquid in real time. The pressure sensor continuously monitors the pressure change inside the tank truck. The temperature sensor monitors the temperature of the filling liquid and the inside of the tank truck in real time. The liquid level sensor detects the change in the liquid level height inside the tank truck in real time and transmits the data to the MCU controller. The MCU controller filters, calibrates and processes the data collected from each sensor.

[0007] S2: Pre-filling status detection. The MCU controller detects the current liquid level of the tank truck through the liquid level sensor, calculates the remaining fillable capacity, detects the pressure inside the tank truck through the pressure sensor to ensure it is within a safe range, and detects the temperature inside the tank truck through the temperature sensor to determine whether pre-cooling treatment is required. The system comprehensively judges the status of the tank truck. If the filling conditions are not met, an alarm is issued and filling is prohibited. If the conditions are met, the relevant valves are opened to prepare for the filling stage.

[0008] S3: Signal acquisition and real-time monitoring. The mass flow meter measures the mass flow rate of the filling liquid in real time, the pressure sensor continuously monitors the pressure changes inside the tank truck, the temperature sensor monitors the temperature of the filling liquid and the inside of the tank truck in real time, and the liquid level sensor detects the changes in the liquid level height inside the tank truck in real time and transmits the data to the MCU controller. The MCU controller filters, calibrates and processes the data of each sensor signal it has acquired.

[0009] S4: Filling status judgment and safety assessment. The MCU controller judges the current filling status based on the real-time collected mass flow rate, pressure, temperature and liquid level data. When the pressure inside the tank truck exceeds the preset maximum safety pressure threshold, it is judged that there is an overpressure risk. When the filling flow rate exceeds the preset maximum flow rate threshold, it is judged that the filling is too fast. When the temperature rises abnormally or cavitation occurs, it is judged that the filling conditions are abnormal. When the liquid level is close to the full load set value, it is judged that the target filling volume is about to be reached. When an emergency stop signal or communication interruption is detected, it is judged that the filling needs to be stopped immediately.

[0010] S5: Dynamic adjustment of filling strategy. When an overpressure risk is detected, the MCU controller reduces the opening of the filling valve through the valve control module or reduces the speed of the cryogenic pump through the frequency converter to slow down the filling speed. When the filling is detected as too fast, the MCU controller adjusts the output frequency of the frequency converter to precisely control the pump speed and bring the filling flow rate back to the set range. When the target filling volume is about to be reached, the MCU controller reduces the filling flow rate in advance to achieve precise control and avoid overfilling. When the filling conditions are detected as abnormal, the MCU controller immediately stops the filling pump, closes the relevant valves, and triggers the safety protection device. When the filling status is normal, the MCU controller maintains the current filling strategy to maintain stable filling.

[0011] S6: Closed-loop control and filling completed. The system continuously repeats the signal acquisition, status judgment and control strategy adjustment process to achieve closed-loop control of the entire filling process, ensuring filling safety, accuracy and efficiency. When the preset filling volume is reached or a manual stop command is received, the MCU controller stops the cryogenic pump, closes the filling valve, and the system performs post-filling processing, closes relevant valves, releases pipeline pressure, records relevant data of this filling, generates a filling report, and uploads it to the management system.

[0012] As a further embodiment of the present invention: the outlet of the cryogenic liquid storage tank is connected to a cryogenic delivery pipeline, on which a mass flow meter module is installed. The output end of the mass flow meter module is connected to the input end of the MCU controller. The pressure sensor module is installed on the tank body of the tank truck, and its output end is connected to the input end of the MCU controller. The temperature sensor module is installed at relevant positions on the tank body of the tank truck and the filling pipeline, and its output end is connected to the input end of the MCU controller. The liquid level sensor module is placed inside the tank truck, and its output end is connected to the input end of the MCU controller.

[0013] As a further embodiment of the present invention: the output terminal of the MCU controller is connected to the input terminal of the valve control module; the output terminal of the MCU controller is also connected to the input terminal of the variable frequency speed control module; the output terminal of the display operation module is connected to the input terminal of the MCU controller; and the output terminal of the MCU controller is connected to the input terminal of the display operation module.

[0014] As a further embodiment of the present invention: the output terminal of the MCU controller is connected to the input terminal of the safety protection module; the feedback signal output terminal of the safety protection module is connected to the input terminal of the MCU controller; the output terminal of the MCU controller is connected to the input terminal of the communication module; and the output terminal of the communication module is connected to the input terminal of the MCU controller.

[0015] As a further embodiment of the present invention: the output terminal of the power supply module is respectively connected to the input terminals of the MCU controller, mass flow meter module, pressure sensor module, temperature sensor module, liquid level sensor module, valve control module, variable frequency speed control module, display operation module, safety protection module and communication module.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In this invention, the system can dynamically and precisely adjust the filling flow rate according to the actual status of the tank truck and the filling requirements. Whether facing tank trucks of different specifications or complex and ever-changing filling environments, it can ensure that the filling amount is accurate to the kilogram level. This high-precision control capability not only effectively avoids various problems caused by overfilling or underfilling, but also greatly improves the utilization rate of cryogenic liquids.

[0018] In this invention, the system achieves efficient operation of the filling process by deeply optimizing the filling strategy and fully combining real-time working conditions and equipment performance. While ensuring filling quality, it significantly shortens the filling time and significantly improves work efficiency. At the same time, the intelligent algorithm will reasonably adjust the operating parameters of the equipment according to the actual situation, reduce unnecessary energy consumption, and achieve a combination of energy saving and efficiency improvement.

[0019] The system in this invention has a high degree of automation, which can complete the entire filling process without human intervention. From parameter monitoring and flow regulation to safety protection, each link is automatically completed by the intelligent control system, which greatly reduces the tediousness and uncertainty of manual operation. This not only reduces the labor intensity of operators, but also effectively avoids operational errors and safety accidents caused by human factors, making the filling operation safer, more stable and reliable.

[0020] In this invention, the system continuously monitors key parameters such as pressure and temperature 24 hours a day throughout the entire filling process. With advanced sensor technology and intelligent algorithms, it can quickly detect any subtle parameter anomalies. Once a potential safety risk is detected, the system will immediately and automatically activate the corresponding protection mechanism, such as precisely controlling valve opening and closing and urgently adjusting the filling speed, thus nipping potential safety hazards in the bud and providing comprehensive and multi-level safety protection for the filling operation of cryogenic liquid tank trucks.

[0021] In this invention, the system records every key data point in the filling process in detail and completely, including pressure, temperature, flow rate, and time. This data is properly stored in the database, forming a traceable electronic file. In terms of quality management, this data can be retrieved at any time for analysis and evaluation, allowing for the timely identification of potential problems and the implementation of corresponding improvement measures. In terms of accident analysis, the detailed data records can provide strong evidence for identifying the cause of the accident and determining responsibility. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the intelligent cryogenic liquid tanker filling control system described in this invention;

[0023] Figure 2 This is a flowchart illustrating the control system of the intelligent cryogenic liquid tanker filling control system described in this invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0026] Reference Figures 1 to 2 In the embodiments of the present invention:

[0027] Example 1

[0028] An intelligent control system for filling cryogenic liquid tank trucks includes: a cryogenic liquid storage tank, an MCU controller, a mass flow meter module, a pressure sensor module, a temperature sensor module, a liquid level sensor module, a valve control module, a variable frequency speed control module, a display and operation module, a safety protection module, a communication module, and a power supply module. The filling control system includes the following steps:

[0029] S1: System startup and initialization. The mass flow meter measures the mass flow rate of the filling liquid in real time. The pressure sensor continuously monitors the pressure change inside the tank truck. The temperature sensor monitors the temperature of the filling liquid and the inside of the tank truck in real time. The liquid level sensor detects the change in the liquid level height inside the tank truck in real time and transmits the data to the MCU controller. The MCU controller filters, calibrates and processes the data collected from each sensor.

[0030] S2: Pre-filling status detection. The MCU controller detects the current liquid level of the tank truck through the liquid level sensor, calculates the remaining fillable capacity, detects the pressure inside the tank truck through the pressure sensor to ensure it is within a safe range, and detects the temperature inside the tank truck through the temperature sensor to determine whether pre-cooling treatment is required. The system comprehensively judges the status of the tank truck. If the filling conditions are not met, an alarm is issued and filling is prohibited. If the conditions are met, the relevant valves are opened to prepare for the filling stage.

[0031] S3: Signal acquisition and real-time monitoring. The mass flow meter measures the mass flow rate of the filling liquid in real time, the pressure sensor continuously monitors the pressure changes inside the tank truck, the temperature sensor monitors the temperature of the filling liquid and the inside of the tank truck in real time, and the liquid level sensor detects the changes in the liquid level height inside the tank truck in real time and transmits the data to the MCU controller. The MCU controller filters, calibrates and processes the data of each sensor signal it has acquired.

[0032] S4: Filling status judgment and safety assessment. The MCU controller judges the current filling status based on the real-time collected mass flow rate, pressure, temperature and liquid level data. When the pressure inside the tank truck exceeds the preset maximum safety pressure threshold, it is judged that there is an overpressure risk. When the filling flow rate exceeds the preset maximum flow rate threshold, it is judged that the filling is too fast. When the temperature rises abnormally or cavitation occurs, it is judged that the filling conditions are abnormal. When the liquid level is close to the full load set value, it is judged that the target filling volume is about to be reached. When an emergency stop signal or communication interruption is detected, it is judged that the filling needs to be stopped immediately.

[0033] S5: Dynamic adjustment of filling strategy. When an overpressure risk is detected, the MCU controller reduces the opening of the filling valve through the valve control module or reduces the speed of the cryogenic pump through the frequency converter to slow down the filling speed. When the filling is detected as too fast, the MCU controller adjusts the output frequency of the frequency converter to precisely control the pump speed and bring the filling flow rate back to the set range. When the target filling volume is about to be reached, the MCU controller reduces the filling flow rate in advance to achieve precise control and avoid overfilling. When the filling conditions are detected as abnormal, the MCU controller immediately stops the filling pump, closes the relevant valves, and triggers the safety protection device. When the filling status is normal, the MCU controller maintains the current filling strategy to maintain stable filling.

[0034] S6: Closed-loop control and filling completed. The system continuously repeats the signal acquisition, status judgment and control strategy adjustment process to achieve closed-loop control of the entire filling process, ensuring filling safety, accuracy and efficiency. When the preset filling volume is reached or a manual stop command is received, the MCU controller stops the cryogenic pump, closes the filling valve, and the system performs post-filling processing, closes relevant valves, releases pipeline pressure, records relevant data of this filling, generates a filling report, and uploads it to the management system.

[0035] As a further embodiment of the present invention: the outlet of the cryogenic liquid storage tank is connected to a cryogenic delivery pipeline, on which a mass flow meter module is installed. The output end of the mass flow meter module is connected to the input end of an MCU controller. A pressure sensor module is installed on the tank body of the tank truck, and its output end is connected to the input end of the MCU controller. A temperature sensor module is installed on the tank body of the tank truck and at relevant locations on the filling pipeline, and its output end is connected to the input end of the MCU controller. A liquid level sensor module is placed inside the tank truck, and its output end is connected to the input end of the MCU controller.

[0036] Example 2

[0037] The outlet of the cryogenic liquid storage tank is connected to a cryogenic delivery pipeline, which is equipped with a mass flow meter module. The output of the mass flow meter module is connected to the input of the MCU controller to transmit the real-time measured mass flow rate data of the filling liquid to the MCU controller.

[0038] The pressure sensor module is installed on the tanker body, and its output is connected to the input of the MCU controller to feed back the pressure data inside the tanker to the MCU controller in real time. The temperature sensor module is also installed on the tanker body and related locations of the filling pipeline, and its output is connected to the input of the MCU controller to transmit the detected temperature data to the MCU controller. The liquid level sensor module is placed inside the tanker, and its output is connected to the input of the MCU controller to transmit the liquid level information inside the tanker to the MCU controller.

[0039] The output of the MCU controller is connected to the input of the valve control module. Based on the data received from various sensors, the MCU controller sends instructions to the valve control module to control the opening and closing of the valves in the filling pipeline. The output of the MCU controller is also connected to the input of the variable frequency speed control module. By adjusting the output frequency of the variable frequency drive, the speed of the cryogenic pump is controlled, thereby controlling the filling flow rate.

[0040] The output of the display operation module is connected to the input of the MCU controller. Operators can input filling parameters, operation commands, and other information through the display operation module. The output of the MCU controller is connected to the input of the display operation module, which displays the real-time status information during the filling process, thus realizing human-machine interaction.

[0041] The output of the MCU controller is connected to the input of the safety protection module. When an abnormal situation is detected, the MCU controller triggers the safety protection module to take action, such as controlling the emergency shut-off valve to close. After the safety protection module takes action, it will output a feedback signal. The feedback signal output is connected to the input of the MCU controller so that the MCU controller can understand the action status of the safety protection device.

[0042] The output of the MCU controller is connected to the input of the communication module. The MCU controller sends the data information during the filling process to the host computer or remote monitoring center through the communication module. The output of the communication module is connected to the input of the MCU controller, receives the instruction information sent by the host computer or remote monitoring center, and transmits it to the MCU controller.

[0043] The output of the power module is connected to the input of the MCU controller, mass flow meter module, pressure sensor module, temperature sensor module, liquid level sensor module, valve control module, variable frequency speed control module, display operation module, safety protection module, and communication module, respectively, to provide stable power to these modules and ensure normal system operation.

[0044] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A control system for intelligent filling of a cryogenic liquid tank truck, characterized by, Comprise: Low-temperature liquid storage tank, MCU controller, mass flow meter module, pressure sensor module, temperature sensor module, liquid level sensor module, valve control module, variable frequency speed regulation module, display operation module, safety protection module, communication module and power module, its filling control system comprises the following steps: S1: system startup and initialization, mass flow meter real-time measurement of the mass flow of filling liquid, pressure sensor continuously monitors the pressure change in the tank car, temperature sensor real-time monitoring of filling liquid and tank internal temperature, liquid level sensor real-time detection of the change of liquid level height in the tank car, and the data is transmitted to MCU controller, MCU controller to the collected sensor signal filtering, calibration and data processing; S2: filling state detection before, MCU controller detects the current liquid level of the tank car through the liquid level sensor, calculates the remaining filling capacity, detects the pressure in the tank car through the pressure sensor, ensures that it is within the safe range, detects the temperature in the tank car through the temperature sensor, judges whether precooling treatment is needed, the system comprehensively judges the state of the tank car, if the filling conditions are not met, an alarm is issued and filling is prohibited, if the conditions are met, the relevant valves are opened, and the filling stage is prepared; S3: signal acquisition and real-time monitoring, mass flow meter real-time measurement of the mass flow of filling liquid, pressure sensor continuously monitors the pressure change in the tank car, temperature sensor real-time monitoring of filling liquid and tank internal temperature, liquid level sensor real-time detection of the change of liquid level height in the tank car, and the data is transmitted to MCU controller, MCU controller to the collected sensor signal filtering, calibration and data processing; S4: filling state judgment and safety evaluation, MCU controller judges the current filling state according to the real-time collected mass flow, pressure, temperature and liquid level data; S5: dynamic adjustment of filling strategy, when it is determined that there is an overpressure risk, MCU controller reduces the opening of the filling valve through the valve control module, or reduces the speed of the low-temperature pump through the variable frequency speed regulation module, to slow down the filling speed, when it is determined that the filling is too fast, MCU controller adjusts the output frequency of the frequency converter to accurately control the speed of the pump, so that the filling flow returns to the set range, when it is determined that the target filling amount is about to be reached, MCU controller reduces the filling flow in advance to achieve accurate control and avoid overfilling, when it is determined that the filling conditions are abnormal, MCU controller immediately stops the filling pump, closes the relevant valves, and triggers the safety protection device, when the filling state is normal, MCU controller maintains the current filling strategy to maintain stable filling; S6: closed loop control and filling completion, the system repeatedly executes the signal acquisition, state judgment and control strategy adjustment process to realize closed loop control of the whole filling process, ensures safe, accurate and efficient filling, when the preset filling amount is reached or a manual stop instruction is received, MCU controller stops the low-temperature pump, closes the filling valve, the system performs post-processing, closes the relevant valves, releases the pipeline pressure, records the relevant data of this filling, generates a filling report, and uploads it to the management system.

2. The control system for filling a tank car with a cryogenic liquid according to claim 1, wherein, The outlet of the low-temperature liquid storage tank is connected with a low-temperature conveying pipeline, a mass flow meter module is arranged on the pipeline, the output end of the mass flow meter module is connected with the input end of the MCU controller, the pressure sensor module is installed on the tank body of the tank truck, the output end thereof is connected with the input end of the MCU controller, the temperature sensor module is installed on the tank body of the tank truck and the related position of the filling pipeline, the output end thereof is connected with the input end of the MCU controller, and the liquid level sensor module is arranged in the tank truck, the output end thereof is connected with the input end of the MCU controller.

3. The control system for filling a tank car with a cryogenic liquid according to claim 1, wherein, The output end of the MCU controller is connected with the input end of the valve control module, the output end of the MCU controller is also connected with the input end of the variable frequency speed regulation module, the output end of the display operation module is connected with the input end of the MCU controller, and the output end of the MCU controller is connected with the input end of the display operation module.

4. The control system for filling a tank car with a cryogenic liquid according to claim 1, wherein, The output end of the MCU controller is connected with the input end of the safety protection module, the feedback signal output end of the safety protection module is connected with the input end of the MCU controller, the output end of the MCU controller is connected with the input end of the communication module, and the output end of the communication module is connected with the input end of the MCU controller.

5. The control system for filling a tank car with a cryogenic liquid according to claim 1, wherein, The output end of the power module is connected with the input end of the MCU controller, the mass flow meter module, the pressure sensor module, the temperature sensor module, the liquid level sensor module, the valve control module, the variable frequency speed regulation module, the display operation module, the safety protection module and the communication module respectively.

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