Safe filling method for low-temperature liquid

Abstract

The invention discloses a safe filling method for low-temperature liquid. Comprising a low-temperature storage unit, an intelligent pressurization module, an efficient liquid conveying pipeline, a powerful low-temperature pump, a precise filling gun, a high-precision electronic scale, an intelligent PLC control system, a high-definition touch screen operation interface, a multiple safety valve, a high-sensitivity leakage detection sensor, a rapid emergency cut-off valve, an overtemperature monitoring sensor and an oxygen concentration monitor. In the filling process, various sensors collect signals of pressure, temperature, liquid level, leakage conditions, oxygen concentration and the like of the system in real time. When the pressure is too high, the temperature is abnormal, leakage is detected, the oxygen concentration is abnormal and the like, the system can make a response quickly. For example, when pressure is too high, the valve is adjusted to reduce pressure, and if not, the safety valve is triggered; and when leakage is detected, the stop valve is quickly closed, so that the safety of personnel and equipment is guaranteed to the greatest extent.

Description

Technical Field

[0001] This invention relates to the field of cryogenic liquid filling equipment technology, specifically a safe filling method for cryogenic liquids. Background Technology

[0002] Cryogenic liquids generally refer to liquids with a boiling point below -100℃, also known as deep cryogenic liquids. Cryogenic liquids should be stored in specially designed cryogenic containers, such as Dewar flasks and cryogenic storage tanks. These containers need to have good thermal insulation properties to reduce heat transfer and prevent the liquid from vaporizing too quickly.

[0003] This requires filling these cryogenic containers with cryogenic liquids using filling equipment. The filling pressure of cryogenic liquids is relatively high and the temperature is relatively low. In addition, some cryogenic liquids may be flammable and explosive, which makes the current filling methods for cryogenic liquids less safe during operation. Summary of the Invention

[0004] The purpose of this invention is to provide a safe filling method for cryogenic liquids in order to solve the problem of low safety during operation of existing filling methods for cryogenic liquids.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a safe filling method for cryogenic liquids, comprising: a cryogenic storage unit, an intelligent pressurization module, a high-efficiency infusion pipeline, a powerful cryogenic pump, a precision filling gun, a high-precision electronic scale, an intelligent PLC control system, a high-definition touchscreen operating interface, multiple safety valves, a high-sensitivity leak detection sensor, a rapid emergency shut-off valve, an over-temperature monitoring sensor, and an oxygen concentration monitor, wherein the filling method comprises the following steps:

[0006] The system starts up and performs a self-test. After pressing the start command through the high-definition touch screen operation interface, the power supply provides stable power to the entire system. The intelligent booster module begins to pressurize the cryogenic storage unit, providing stable power for the delivery of cryogenic liquids. The intelligent PLC control system performs a comprehensive initialization, configuring each interface in detail and accurately setting each key parameter. The system checks the status of all safety devices, including multiple safety valves, high-sensitivity leak detection sensors, rapid emergency shut-off valves, over-temperature monitoring sensors, and oxygen concentration monitors. If any device abnormality is found, the fault information is immediately displayed on the touch screen operation interface and an alarm is issued.

[0007] During filling preparation, the intelligent PLC control system intelligently opens the corresponding valves and powerful cryogenic pumps based on the detailed information and precise filling parameters of the container to be filled input by the operator on the high-definition touch screen. The precision filling gun is tightly and reliably connected to the container to be filled through a special quick connector. The system automatically performs multiple replacement operations on the filling container to completely remove air and moisture from the container and ensure the purity of the filling environment.

[0008] Signal acquisition: a high-precision electronic scale collects the weight change signal of the filling container in real time; a level gauge monitors the liquid level height signal in the cryogenic storage unit in real time; a pressure gauge acquires the pressure signal of the system in real time; an over-temperature monitoring sensor senses the temperature change signal of the system in real time; a leak detection sensor detects whether there is a cryogenic liquid leak at the filling site in real time; and an oxygen concentration monitor monitors the oxygen concentration at the filling site in real time. All sensors will feed back the collected signals to the intelligent PLC control system in a timely and accurate manner.

[0009] Status Judgment: The intelligent PLC control system accurately judges the operating status of the system based on the collected comprehensive information. When the filling amount is close to the target value, the system enters the precise control state. If the liquid level is lower than the minimum safety threshold, it indicates that there is insufficient liquid in the cryogenic storage unit. When the pressure exceeds the maximum set threshold, the system faces the risk of overpressure. If the temperature exceeds the normal range, there may be equipment failure or abnormality. Once a leak is detected, it indicates that there is a safety hazard in the system. When the oxygen concentration is abnormal, it may affect the safety of the operators.

[0010] Intelligent control adjustment ensures near-target filling volume: The intelligent PLC control system automatically reduces the speed of the powerful cryogenic pump or precisely decreases the valve opening to achieve high-precision filling and ensure that the filling volume error is within a minimal range; Low liquid level: The system immediately issues an alarm and displays the message "Low liquid level, please replenish liquid in time" on the touch screen interface, reminding the operator to replenish the liquid; High pressure: First, the system attempts to reduce the pressure by adjusting the valve opening; if the pressure still does not return to normal after adjustment, multiple safety valves are immediately triggered for emergency pressure relief to ensure that the system pressure is within a safe range; Abnormal temperature: The system issues an over-temperature alarm and automatically adjusts the operating parameters of the powerful cryogenic pump or activates the cooling device to restore the temperature to the normal range as soon as possible; Leakage occurs: The system quickly issues a sharp alarm and rapidly closes the emergency shut-off valve to prevent further leakage of cryogenic liquid, and displays the leak location and handling suggestions on the touch screen interface; Abnormal oxygen concentration: The system issues an alarm and automatically activates the ventilation equipment to increase the ventilation volume at the filling site and ensure the safety of the operators; Normal state: The system maintains the current speed of the powerful cryogenic pump and the valve opening to ensure a stable and efficient filling process;

[0011] With dynamic monitoring, the system enters a continuous loop operation mode, constantly acquiring signals from all directions, accurately judging the status, and intelligently adjusting the control. It monitors various parameters and operating status of the system in real time, and adjusts the speed of the powerful cryogenic pump and the valve opening in a timely and flexible manner according to the actual situation, so as to achieve efficient, safe and precise control of the cryogenic liquid filling process.

[0012] As a further aspect of the present invention: the cryogenic storage unit is connected to an intelligent pressurization module, the intelligent pressurization module is connected to a powerful cryogenic pump through a high-efficiency infusion pipeline, the powerful cryogenic pump is connected to a precision filling gun, the precision filling gun is connected to the container to be filled, and the high-precision electronic scale is located below the filling container for accurately measuring the weight of the filling container.

[0013] As a further embodiment of the present invention: the level gauge, pressure gauge and over-temperature monitoring sensor are installed on the cryogenic storage unit and are used to monitor the level, pressure and temperature in real time, respectively; the leak detection sensor and oxygen concentration monitor are distributed in various key locations at the filling site.

[0014] As a further aspect of the present invention: the input end of the intelligent PLC control system is connected to a high-precision electronic scale, a level gauge, a pressure gauge, an over-temperature monitoring sensor, a leak detection sensor, and an oxygen concentration monitor, receiving various signals fed back from them; the output end is connected to an intelligent booster module, a powerful cryogenic pump, various valves, and a rapid emergency shut-off valve, enabling intelligent control of these devices.

[0015] As a further aspect of the present invention: the high-definition touch screen operation interface is connected to the intelligent PLC control system, which facilitates operators to input key parameters and monitor the system operation status in real time. The multiple safety valves are installed in key parts of the low-temperature storage unit and the high-efficiency infusion pipeline, and automatically open to release pressure when the system pressure exceeds the set safety value.

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

[0017] In this invention, during the filling process, various sensors collect signals such as system pressure, temperature, liquid level, leakage status, and oxygen concentration in real time. When situations such as excessive pressure, abnormal temperature, detected leakage, or abnormal oxygen concentration occur, the system will react quickly. For example, if the pressure is too high, it will first adjust the valve to reduce the pressure; if this is ineffective, it will trigger the safety valve. If a leak is detected, it will quickly close the shut-off valve, thus maximizing the safety of personnel and equipment.

[0018] In this invention, a high-precision electronic scale collects the weight change signal of the filling container in real time. When the filling amount is close to the target value, the intelligent PLC control system automatically reduces the speed of the powerful cryogenic pump or precisely reduces the valve opening to achieve high-precision filling and ensure that the filling amount error is within a very small range, which meets the application scenarios with strict filling amount requirements. In the filling preparation stage, the intelligent PLC control system opens the corresponding valves and powerful cryogenic pump according to the detailed information of the container to be filled and the precise filling parameters input by the operator on the high-definition touch screen, which can accurately fill according to the characteristics of different containers.

[0019] In this invention, the intelligent PLC control system performs a comprehensive initialization upon startup, configures each interface in detail, and precisely sets each key parameter, providing a stable operating foundation for the entire filling process. Under normal conditions, the system maintains the current speed of the powerful cryogenic pump and the valve opening to ensure the filling process is stable and efficient. At the same time, the system enters a continuous cycle operation mode, constantly acquiring signals, judging status, and making intelligent control adjustments, which can promptly respond to various emergencies and ensure the continuity and stability of the filling process.

[0020] In the filling preparation stage, the system automatically performs multiple replacement operations on the filling container to completely remove air and moisture from the container, ensuring the purity of the filling environment and avoiding the impact of impurities on the quality of the cryogenic liquid. It is suitable for fields with high requirements for liquid purity. The oxygen concentration at the filling site is monitored in real time by an oxygen concentration monitor. When the oxygen concentration is abnormal, the system issues an alarm and automatically turns on the ventilation equipment to increase the ventilation at the filling site, ensuring the safety of operators and enabling the system to adapt to different environmental conditions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the control system in the safe filling method for cryogenic liquids described in this invention;

[0022] Figure 2 This is a schematic diagram of the control flow structure of a safe filling method for cryogenic liquids according to the present invention.

[0023] In the picture: 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 Figure 1 middle Figure 2 In the embodiments of the present invention:

[0027] Example 1

[0028] A safe filling method for cryogenic liquids includes: a cryogenic storage unit, an intelligent pressurization module, a high-efficiency infusion pipeline, a powerful cryogenic pump, a precision filling gun, a high-precision electronic scale, an intelligent PLC control system, a high-definition touchscreen operating interface, multiple safety valves, a high-sensitivity leak detection sensor, a rapid emergency shut-off valve, an over-temperature monitoring sensor, and an oxygen concentration monitor. The filling method comprises the following steps:

[0029] S1: System startup and self-test. Press the start command through the high-definition touch screen operation interface. The power supply provides stable power to the entire system. The intelligent booster module starts to boost the pressure of the cryogenic storage unit, providing stable power for the delivery of cryogenic liquid. The intelligent PLC control system performs a full initialization, configures each interface in detail, and sets each key parameter precisely. The system checks the status of all safety devices, including multiple safety valves, high-sensitivity leak detection sensors, fast emergency shut-off valves, over-temperature monitoring sensors, and oxygen concentration monitors. If any device abnormality is found, the fault information is immediately displayed on the touch screen operation interface and an alarm is issued.

[0030] S2: Filling preparation. The intelligent PLC control system intelligently opens the corresponding valves and powerful cryogenic pump based on the detailed information and precise filling parameters of the container to be filled input by the operator on the high-definition touch screen. The precision filling gun is tightly and reliably connected to the container to be filled through a special quick connector. The system automatically performs multiple replacement operations on the filling container to completely remove air and moisture from the container and ensure the purity of the filling environment.

[0031] S3: Signal acquisition. A high-precision electronic scale acquires the weight change signal of the filling container in real time, a level gauge monitors the liquid level in the cryogenic storage unit in real time, a pressure gauge acquires the system pressure signal in real time, an over-temperature monitoring sensor senses the temperature change signal of the system in real time, a leak detection sensor detects whether there is a cryogenic liquid leak at the filling site in real time, and an oxygen concentration monitor monitors the oxygen concentration at the filling site in real time. All sensors will feed back the acquired signals to the intelligent PLC control system in a timely and accurate manner.

[0032] S4: Status Judgment. The intelligent PLC control system accurately judges the operating status of the system based on the collected comprehensive information. When the filling amount is close to the target value, the system enters the precise control state. If the liquid level is lower than the minimum safety threshold, it indicates that there is insufficient liquid in the cryogenic storage unit. When the pressure exceeds the maximum set threshold, the system faces the risk of overpressure. If the temperature exceeds the normal range, there may be equipment failure or abnormality. Once a leak is detected, it indicates that there is a safety hazard in the system. When the oxygen concentration is abnormal, it may affect the safety of the operators.

[0033] S5: Intelligent control adjustment, filling volume approaches target: Intelligent PLC The control system automatically reduces the speed of the high-power cryogenic pump or precisely reduces the valve opening to achieve high-precision filling and ensure that the filling volume error is within a very small range. For low liquid levels: the system immediately issues an alarm and displays a message on the touchscreen interface stating "Low liquid level, please replenish liquid promptly," reminding the operator to replenish the liquid. For high pressure: the system first attempts to reduce the pressure by adjusting the valve opening; if the pressure does not return to normal after adjustment, multiple safety valves are immediately triggered for emergency pressure relief to ensure the system pressure is within a safe range. For abnormal temperature: the system issues an over-temperature alarm and automatically adjusts the operating parameters of the high-power cryogenic pump or activates the cooling device to restore the temperature to the normal range as quickly as possible. For leaks: the system quickly issues a sharp alarm and rapidly closes the emergency shut-off valve to prevent further leakage of the cryogenic liquid, displaying the leak location and handling suggestions on the touchscreen interface. For abnormal oxygen concentration: the system issues an alarm and automatically activates the ventilation equipment to increase the ventilation volume at the filling site, ensuring the safety of the operators. Under normal conditions: the system maintains the current speed of the high-power cryogenic pump and the valve opening to ensure a stable and efficient filling process.

[0034] S6: Dynamic monitoring. The system enters a continuous loop operation mode, constantly collecting signals from all directions, accurately judging the status, and intelligently adjusting the control. It monitors various parameters and operating status of the system in real time, and adjusts the speed of the powerful cryogenic pump and the valve opening in a timely and flexible manner according to the actual situation, so as to achieve efficient, safe and precise control of the cryogenic liquid filling process.

[0035] Example 2

[0036] The cryogenic storage unit is connected to an intelligent pressurization module, which in turn is connected to a powerful cryogenic pump via a high-efficiency infusion pipeline. The powerful cryogenic pump is connected to a precision filling gun, which is then connected to the container to be filled. A high-precision electronic scale is located below the filling container to accurately measure its weight. Level gauges, pressure gauges, and over-temperature monitoring sensors are installed on the cryogenic storage unit to monitor the liquid level, pressure, and temperature in real time. Leak detection sensors and oxygen concentration monitors are distributed at various key locations in the filling area. The input terminals of the intelligent PLC control system are connected to the high-precision electronic scales, level gauges, pressure gauges, over-temperature monitoring sensors, leak detection sensors, and oxygen concentration monitors, receiving various signals from them. The output terminals are connected to the intelligent pressurization module, the powerful cryogenic pump, various valves, and the rapid emergency shut-off valve for intelligent control of these devices. A high-definition touchscreen operating interface is connected to the intelligent PLC control system, facilitating the input of key parameters and real-time monitoring of the system's operating status. Multiple safety valves are installed at key locations in the cryogenic storage unit and the high-efficiency infusion pipeline, automatically opening to release pressure when the system pressure exceeds a set safety value.

[0037] 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 safe filling system for cryogenic liquids, characterized in that, include: The cryogenic storage unit, intelligent pressurization module, high-efficiency infusion pipeline, powerful cryogenic pump, precision filling gun, high-precision electronic scale, intelligent PLC control system, high-definition touch screen operating interface, multiple safety valves, high-sensitivity leak detection sensor, rapid emergency shut-off valve, over-temperature monitoring sensor, and oxygen concentration monitor are filled using the following steps: S1: System startup and self-test. Press the start command through the high-definition touch screen. The power supply provides stable power to the system. The intelligent booster module boosts the pressure of the cryogenic storage unit to provide power for liquid transportation. The intelligent PLC control system is fully initialized, the interface is configured and key parameters are set. The system checks the status of various safety devices. If there is any abnormality, the fault information is displayed on the touch screen and an alarm is triggered. S2: Filling preparation. The intelligent PLC control system opens the corresponding valves and powerful cryogenic pump based on the information of the container to be filled and the filling parameters entered by the operator on the high-definition touch screen. The precision filling gun is tightly connected to the container through a special quick connector. The system automatically replaces the filling container multiple times to remove air and moisture and ensure a pure filling environment. S3: Signal acquisition. The high-precision electronic scale acquires the weight change signal of the filling container, the liquid level gauge monitors the liquid level height signal of the low-temperature storage unit, the pressure gauge acquires the system pressure signal, the over-temperature monitoring sensor senses the system temperature change signal, the leak detection sensor detects whether there is a leak at the filling site, and the oxygen concentration monitor monitors the oxygen concentration at the site. All sensors feed back the signals to the intelligent PLC control system. S4: Status Judgment. The intelligent PLC control system judges the system's operating status based on the collected information. When the filling amount is close to the target value, it enters the precise control state; when the liquid level is lower than the minimum safety threshold, it indicates insufficient liquid; when the pressure exceeds the maximum set threshold, the system is at risk of overpressure; when the temperature exceeds the normal range, there may be equipment failure; when a leak is detected, the system has a safety hazard; when the oxygen concentration is abnormal, it affects the safety of the operators. S5: Intelligent control adjustment, which provides intelligent real-time control adjustment for different states such as filling volume approaching the target, liquid level too low, pressure too high, abnormal temperature, leakage, abnormal oxygen concentration, and normal conditions; S6: Dynamic monitoring. The system enters a cyclic operation mode, continuously acquiring signals, judging status, and intelligently controlling and adjusting. It monitors system parameters and operating status in real time, and flexibly adjusts the speed of the powerful cryogenic pump and the valve opening according to the actual situation, so as to achieve efficient, safe and precise control of cryogenic liquid filling.

2. The safe filling method for cryogenic liquids according to claim 1, characterized in that, The cryogenic storage unit is connected to an intelligent pressurization module, which is connected to a powerful cryogenic pump via a high-efficiency infusion pipeline. The powerful cryogenic pump is connected to a precision filling gun, which is connected to the container to be filled. The high-precision electronic scale is located below the filling container and is used to accurately measure the weight of the filling container.

3. The safe filling method for cryogenic liquids according to claim 1, characterized in that, The level gauge, pressure gauge, and over-temperature monitoring sensor are installed on the cryogenic storage unit to monitor the level, pressure, and temperature in real time, respectively. The leak detection sensor and oxygen concentration monitor are distributed at various key locations in the filling site.

4. The safe filling method for cryogenic liquids according to claim 1, characterized in that, The input end of the intelligent PLC control system is connected to a high-precision electronic scale, level gauge, pressure gauge, over-temperature monitoring sensor, leak detection sensor, and oxygen concentration monitor, receiving various signals from them; the output end is connected to an intelligent booster module, a powerful cryogenic pump, various valves, and a rapid emergency shut-off valve, enabling intelligent control of these devices.

5. The safe filling method for cryogenic liquids according to claim 1, characterized in that, The high-definition touch screen operating interface is connected to the intelligent PLC control system, which makes it convenient for operators to input key parameters and monitor the system's operating status in real time. The multiple safety valves are installed in key parts of the cryogenic storage unit and the high-efficiency infusion pipeline, and automatically open to release pressure when the system pressure exceeds the set safety value.

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