A dynamic monitoring and control system for liquid nitrogen vaporization process

Abstract

The invention discloses a liquid nitrogen vaporization process dynamic monitoring and control system, relates to the technical field of liquid nitrogen vaporization monitoring, and solves the technical problem in the prior art that the environment cannot be monitored in real time, resulting in the inability to regulate the liquid nitrogen vaporization in advance. Specifically, the liquid nitrogen vaporization state is monitored in real time, the liquid nitrogen vaporization process is monitored in real time by a high-speed camera, and bubble formation, bubble growth and bubble escape phenomena in the liquid nitrogen vaporization process are monitored and analyzed based on monitoring pictures; the liquid nitrogen vaporization is monitored in an ambient temperature area, the liquid nitrogen vaporization container is used as the area center, and various types of area marks are obtained based on the area center. Temperature influence analysis is performed through the analysis of various types of areas. After the analysis is completed, tank area floating data and tank area influence data are collected. Whether the liquid nitrogen vaporization state is qualified is inferred based on the data analysis. If yes, the next step is carried out; if not, regulation is performed.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid nitrogen vaporization monitoring, in particular to a liquid nitrogen vaporization process dynamic monitoring and control system. Background Art

[0002] Liquid nitrogen vaporization refers to the process of liquid nitrogen turning into gaseous nitrogen; liquid nitrogen is a liquid formed by the liquefaction of nitrogen at low temperatures (the boiling point of liquid nitrogen is -196°C under standard atmospheric pressure); when the temperature of liquid nitrogen rises or the pressure of the environment decreases, liquid nitrogen will absorb heat and turn from liquid to gas.

[0003] However, in the existing technology, the vaporization state of liquid nitrogen itself cannot be monitored during vaporization, resulting in the inability to control the vaporization conversion amount in real time. In addition, the ambient temperature area cannot be monitored, so that the temperature impact of liquid nitrogen vaporization cannot be controlled. Moreover, the environment cannot be monitored in real time, resulting in the inability to pre-regulate the liquid nitrogen vaporization. Finally, the type of the carrier container cannot be sorted, resulting in the liquid nitrogen vaporization efficiency not being in the optimal state.

[0004] In view of the above technical defects, a solution is now proposed. Summary of the Invention

[0005] The purpose of the present invention is to solve the above-mentioned problems and to provide a dynamic monitoring and control system for the liquid nitrogen vaporization process.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A liquid nitrogen vaporization process dynamic monitoring and control system includes a dynamic monitoring center, the dynamic monitoring center is communicatively connected to an ambient temperature area monitoring unit, a real-time status monitoring unit, a carrier container monitoring unit, and a ventilation status monitoring unit;

[0008] The real-time status monitoring unit monitors the vaporization status of liquid nitrogen in real time. The high-speed camera monitors the vaporization process of liquid nitrogen in real time and monitors and analyzes the bubble formation, bubble growth and bubble escape during the vaporization process of liquid nitrogen based on the monitoring images.

[0009] The ambient temperature area monitoring unit monitors the ambient temperature area of liquid nitrogen vaporization, taking the liquid nitrogen vaporization container as the area center and obtaining various types of area labels based on the area center. Temperature impact analysis is performed through each type of area analysis. After completion, tank area floating data and tank area impact data are collected. Based on the data analysis, it is inferred whether the liquid nitrogen vaporization state is qualified. If yes, the next step is carried out; if not, regulation is carried out.

[0010] The containment vessel monitoring unit monitors and analyzes the containment vessel, collects vaporization area data and vaporization heat data, and infers whether the containment vessel monitoring is qualified based on the data analysis. If yes, it proceeds to the next step; if not, it performs container control.

[0011] The ventilation status monitoring unit monitors the ventilation status of the surrounding environment, collects circulation speed information and nitrogen production rate information, and infers whether the ventilation status has an impact on the current liquid nitrogen vaporization process based on information analysis. If so, ventilation control is performed; otherwise, the monitoring cycle is completed.

[0012] As a preferred embodiment of the present invention, the ambient temperature area monitoring unit process is as follows:

[0013] Collect gas conversion data and gas formation data. If the gas conversion data exceeds the continuously increasing span threshold, and the gas formation data exceeds the periodically decreasing span threshold, the current moment is marked as an effective vaporization moment. If the gas conversion data does not exceed the continuously increasing span threshold, or the gas formation data exceeds the periodically decreasing span threshold, the current moment is marked as an inefficient vaporization moment.

[0014] The corresponding moment types in the current vaporization period are analyzed. If the proportion of the number of effective vaporization moments exceeds the proportion of the number of inefficient vaporization moments, and the consecutive number of effective vaporization moments exceeds the set threshold, a vaporization stable signal is generated; if the proportion of the number of effective vaporization moments does not exceed the proportion of the number of inefficient vaporization moments, or the consecutive number of effective vaporization moments does not exceed the set number threshold, a vaporization unstable signal is generated.

[0015] As a preferred embodiment of the present invention, the gas conversion data and the gas formation data are respectively the continuous growth span of the bubble formation frequency on the liquid nitrogen surface during the stage when the required temperature is adjusted to the set temperature and the corresponding reduction span of the bubble growth cycle on the liquid nitrogen surface.

[0016] As a preferred embodiment of the present invention, the temperature impact analysis process is as follows:

[0017] The temperature values of each area within the center of the current area are collected. If the temperature values are consistent, they are considered to be the same area. If there are deviations in the temperature values, they are divided into different areas. Before vaporization is performed, liquid nitrogen enters the container, and the temperature values of the area are monitored with the center of the area as the origin. The area with a lower temperature value is marked as the liquid nitrogen affected area; and the area outside the liquid nitrogen affected area is marked as the unaffected area.

[0018] If the area affected by liquid nitrogen exceeds the same area, multiple floating risk signals will be generated;

[0019] If the liquid nitrogen affected area does not exceed the same area, a low floating risk signal is generated.

[0020] As a preferred embodiment of the present invention, after completing the temperature impact analysis, the tank area floating data and the tank area impact data are collected. If the tank area floating data does not exceed the interval value shortening speed threshold, or the tank area impact data exceeds the temperature rise speed reduction threshold, a high impact signal of the ambient temperature area is generated; if the tank area floating data exceeds the interval value shortening speed threshold, and the tank area impact data does not exceed the temperature rise speed reduction threshold, a low impact signal of the ambient temperature area is generated.

[0021] As a preferred embodiment of the present invention, the tank area floating data and the tank area impact data are respectively the shortening rate of the interval between the average temperature of the liquid nitrogen impact area of the liquid nitrogen vaporization container and the average temperature of the current area before the liquid nitrogen enters the container, and the reduction in the rising rate of the ambient temperature in the same area when the ambient temperature in different areas of the liquid nitrogen vaporization container decreases.

[0022] As a preferred embodiment of the present invention, the vaporization area data and the vaporization heat data are respectively the ratio of the liquid nitrogen contact surface area of the real-time liquid nitrogen-carrying container to the container surface area during the liquid nitrogen vaporization process, and the heat loss value of the external heat transferred into the container corresponding to the thermal insulation performance of the carrying container material during the liquid nitrogen vaporization process.

[0023] As a preferred embodiment of the present invention, if the vaporization area data does not exceed the area ratio threshold, or the vaporization heat data exceeds the heat loss threshold, a container non-adaptive vaporization signal is generated; if the vaporization area data exceeds the area ratio threshold and the vaporization heat data does not exceed the heat loss threshold, a container adaptive vaporization signal is generated.

[0024] As a preferred embodiment of the present invention, the circulation velocity information and the nitrogen production rate information are respectively the ratio of the air circulation velocity of the surrounding environment of the vaporization execution area during the liquid nitrogen vaporization process to the corresponding speed value of the nitrogen content rising speed, and the ratio of the corresponding speed value of the nitrogen content rising span increase speed of the vaporization execution area during the liquid nitrogen vaporization process to the corresponding speed value of the decrease value of the vaporization nitrogen production rate.

[0025] As a preferred embodiment of the present invention, if the circulation velocity information exceeds the flow rate ratio threshold and the nitrogen production rate information does not exceed the lifting and lowering speed ratio threshold, a ventilation no-impact signal is generated; if the circulation velocity information does not exceed the flow rate ratio threshold, or the liquid nitrogen production rate information exceeds the lifting and lowering speed ratio threshold, a ventilation impact signal is generated.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, the vaporization state of liquid nitrogen is monitored in real time to infer whether the reaction effect of liquid nitrogen itself in the current liquid nitrogen vaporization process is abnormal, thereby ensuring the real-time operation state of liquid nitrogen vaporization, thereby improving the liquid nitrogen vaporization efficiency and ensuring the real-time supply of liquid nitrogen real-time vaporization conversion amount;

[0028] The liquid nitrogen vaporization is monitored in the ambient temperature area. The surrounding environment temperature area monitoring can be used to infer whether the surrounding environment has an impact on the current liquid nitrogen vaporization process. The real-time status of the current liquid nitrogen vaporization can also be inferred in combination with the surrounding environment temperature monitoring. In addition to direct observation of liquid nitrogen vaporization, visual detection is performed through environmental monitoring, which effectively improves the efficiency of liquid nitrogen vaporization. Environmental impacts can also be discovered in a timely manner through environmental monitoring, and liquid nitrogen vaporization can be adjusted in advance, reducing the risk of efficiency reduction during the liquid nitrogen vaporization process.

[0029] 2. In the present invention, the containment vessel is monitored and analyzed to infer whether the current liquid nitrogen vaporization is affected by the containment vessel. This allows for real-time monitoring to ensure the high efficiency of liquid nitrogen vaporization. This facilitates real-time monitoring of the containment vessel during the liquid nitrogen vaporization process to prevent the containment vessel from affecting the liquid nitrogen vaporization efficiency. This real-time monitoring can improve the safety of liquid nitrogen vaporization and ensure that the containment vessel is not affected by the liquid nitrogen vaporization.

[0030] The ventilation status of the surrounding environment is monitored during the liquid nitrogen vaporization process. Through ventilation status monitoring, it is inferred whether the surrounding environment of the current liquid nitrogen vaporization is suitable for liquid nitrogen vaporization. This can avoid poor ventilation conditions in the surrounding environment, where the nitrogen generated by liquid nitrogen vaporization is not removed in time, causing the nitrogen content in the environment in the area where the carrier container is located to increase, and the nitrogen partial pressure around the liquid nitrogen to decrease, which is not conducive to the vaporization reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0032] Figure 1 This is a system principle block diagram of the present invention;

[0033] Figure 2 Flowchart of the method of the system of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] See also Figure 1 As shown, a dynamic monitoring and control system for liquid nitrogen vaporization process includes a dynamic monitoring center, which is communicatively connected to an ambient temperature area monitoring unit, a real-time status monitoring unit, a carrier container monitoring unit, and a ventilation status monitoring unit; the execution method of this system is as follows Figure 2 As shown, the corresponding communication connected units are operated in coordination and each single vaporization monitoring cycle has been completed;

[0037] The dynamic monitoring center generates a real-time status monitoring signal and sends the real-time status monitoring signal to the real-time status monitoring unit. After receiving the real-time status monitoring signal, the real-time status monitoring unit monitors the liquid nitrogen vaporization state in real time and infers whether the reaction effect of the liquid nitrogen itself in the current liquid nitrogen vaporization process is abnormal, thereby ensuring the real-time operation state of the liquid nitrogen vaporization, thereby improving the liquid nitrogen vaporization efficiency and ensuring the real-time supply of the real-time vaporization conversion amount of liquid nitrogen;

[0038] The liquid nitrogen vaporization process is monitored in real time by a high-speed camera, and the bubble formation, bubble growth, and bubble escape phenomena during the liquid nitrogen vaporization process are monitored and analyzed based on the monitoring images;

[0039] During the liquid nitrogen vaporization process, the continuous growth span of the bubble formation frequency on the liquid nitrogen surface and the corresponding reduction span of the bubble growth cycle on the liquid nitrogen surface during the stage when the required temperature is adjusted to the set temperature are obtained. The continuous growth span of the bubble formation frequency on the liquid nitrogen surface and the corresponding reduction span of the bubble growth cycle on the liquid nitrogen surface during the stage when the required temperature is adjusted to the set temperature are marked as gas conversion data and gasification data, and compared with the continuous growth span threshold and the period reduction span threshold respectively:

[0040] If the gas conversion data exceeds the continuously increasing span threshold, and the gasification data exceeds the periodically decreasing span threshold, it is inferred that the current liquid nitrogen vaporization moment corresponds to a qualified vaporization process, and the current moment is marked as a valid vaporization moment;

[0041] If the gas conversion data does not exceed the continuously increasing span threshold, or the gasification data exceeds the periodically decreasing span threshold, it is inferred that the vaporization process corresponding to the current liquid nitrogen vaporization moment is unqualified, and the current moment is marked as an inefficient vaporization moment;

[0042] Analyze the corresponding moment types in the current vaporization period. If the proportion of effective vaporization moments exceeds the proportion of inefficient vaporization moments, and the consecutive number of effective vaporization moments exceeds the set threshold, it is inferred that the real-time status monitoring of the current liquid nitrogen vaporization process is qualified, and a vaporization stability signal is generated and sent to the dynamic monitoring center.

[0043] If the proportion of effective vaporization moments does not exceed the proportion of inefficient vaporization moments, or the consecutive number of effective vaporization moments does not exceed the set number threshold, it is inferred that the real-time status monitoring of the current liquid nitrogen vaporization process is unqualified, and a vaporization instability signal is generated and sent to the dynamic monitoring center;

[0044] After receiving the unstable vaporization signal, the dynamic monitoring center monitors and regulates the liquid nitrogen vaporization process, and generates an ambient temperature area monitoring signal and sends the ambient temperature area monitoring signal to the ambient temperature area monitoring unit. After receiving the ambient temperature area monitoring signal, the ambient temperature area monitoring unit performs ambient temperature area monitoring on the liquid nitrogen vaporization. The ambient temperature area monitoring can be used to infer whether the surrounding environment has an impact on the current liquid nitrogen vaporization process. The real-time status of the current liquid nitrogen vaporization can also be inferred in combination with the ambient temperature monitoring. In addition to direct observation of liquid nitrogen vaporization, visual detection can be performed through environmental monitoring, effectively improving the efficiency of liquid nitrogen vaporization. Environmental impacts can also be discovered in a timely manner through environmental monitoring, and liquid nitrogen vaporization can be adjusted in advance, reducing the risk of efficiency reduction during the liquid nitrogen vaporization process.

[0045] The liquid nitrogen vaporization container is used as the regional center, and the temperature values of each area within the current regional center are collected. If the temperature values are consistent, they are the same area. If there is a deviation in the temperature values, they are divided into different areas. It can be understood that the area is divided into adjacent areas. If the temperature of the area outward from the center is the same, the corresponding area is the same. Otherwise, it is a different area. If a different area appears adjacent to the same area after the same area is determined, the regional division is terminated, and the monitoring range of the ambient temperature exceeds the influence range of the liquid nitrogen temperature.

[0046] Before vaporization is performed, liquid nitrogen enters the container, and the temperature value of the area is monitored with the center of the area as the origin. The area with a lower temperature value is marked as the liquid nitrogen affected area; and the area outside the liquid nitrogen affected area is marked as the non-affected area;

[0047] After collecting liquid nitrogen entering the container, the liquid nitrogen impact area is compared with the same area in the surrounding environment. If the liquid nitrogen impact area exceeds the same area, it is inferred that there is a multi-floating risk in the surrounding area temperature. A multi-floating risk signal is generated and sent to the dynamic monitoring platform. After receiving the multi-floating risk signal, the dynamic monitoring platform collects the surrounding environment temperature at multiple points after the liquid nitrogen vaporization is executed;

[0048] If the scope of the liquid nitrogen affected area does not exceed the scope of the same area, it is inferred that there is no risk of multiple temperature fluctuations in the surrounding area, and a low floating risk signal is generated and sent to the dynamic monitoring platform. After receiving the low floating risk signal, the dynamic monitoring platform collects the surrounding ambient temperature according to the number of threshold points after the liquid nitrogen vaporization is executed;

[0049] After the temperature impact analysis is completed, liquid nitrogen enters the container and begins vaporization. The storage environment temperature is manually increased. During the liquid nitrogen vaporization process, the shortening rate of the interval between the average temperature of the liquid nitrogen-affected area of the liquid nitrogen vaporization container and the average temperature of the current area before the liquid nitrogen enters the container is obtained. At the same time, during the liquid nitrogen vaporization process, the reduction in the rate of increase of the ambient temperature in the same area corresponding to the decrease in the ambient temperature of different areas of the liquid nitrogen vaporization container is obtained. The shortening rate of the interval between the average temperature of the liquid nitrogen-affected area of the liquid nitrogen vaporization container and the average temperature of the current area before the liquid nitrogen enters the container and the reduction in the rate of increase of the ambient temperature in the same area corresponding to the decrease in the ambient temperature of different areas of the liquid nitrogen vaporization container are marked as tank area floating data and tank area impact data, respectively, and compared with the interval shortening rate threshold and the temperature rise rate reduction threshold, respectively:

[0050] If the interval value shortening rate between the average temperature of the liquid nitrogen affected area of the liquid nitrogen vaporization container and the average temperature of the current area before the liquid nitrogen enters the container does not exceed the interval value shortening rate threshold, or when the ambient temperature of different areas of the liquid nitrogen vaporization container decreases, the decrease in the ambient temperature rise rate of the corresponding same area exceeds the temperature rise rate reduction threshold, it is inferred that the current liquid nitrogen vaporization state is unqualified, and a high impact signal of the ambient temperature area is generated and sent to the dynamic monitoring center. After receiving the high impact signal of the ambient temperature area, the dynamic monitoring center adjusts the manual temperature control coverage range of the current vaporization container to avoid the influence of vaporization efficiency due to inconsistent temperature fluctuations of the tank body;

[0051] If the interval between the average temperature of the liquid nitrogen affected area of the liquid nitrogen vaporization container and the average temperature of the current area before the liquid nitrogen enters the container is shortened at a rate exceeding a threshold for the interval shortening rate, and the decrease in the corresponding ambient temperature rise rate in the same area when the ambient temperature in a different area of the liquid nitrogen vaporization container decreases does not exceed a threshold for the temperature rise rate reduction, it is inferred that the current liquid nitrogen vaporization state is qualified, and a low-impact signal for the ambient temperature area is generated and sent to the dynamic monitoring center;

[0052] After determining the low impact of the ambient temperature area, a containment vessel monitoring signal is generated and sent to the containment vessel monitoring unit. After receiving the containment vessel monitoring signal, the containment vessel monitoring unit monitors and analyzes the containment vessel. Through the containment vessel analysis, it is inferred whether the current liquid nitrogen vaporization is affected by the containment vessel, so as to facilitate real-time monitoring to ensure the high efficiency of liquid nitrogen vaporization. It is convenient to perform real-time monitoring of the containment vessel during the liquid nitrogen vaporization process to prevent the containment vessel from affecting the liquid nitrogen vaporization efficiency. The real-time monitoring can improve the safety of liquid nitrogen vaporization and ensure that the containment vessel is not affected by the liquid nitrogen vaporization.

[0053] Obtain the ratio of the liquid nitrogen contact surface area of the container to the container surface area during the real-time liquid nitrogen vaporization process. At the same time, obtain the heat loss value due to the external heat transferred into the container due to the thermal insulation performance of the container material during the liquid nitrogen vaporization process. The ratio of the liquid nitrogen contact surface area of the container to the container surface area during the real-time liquid nitrogen vaporization process and the heat loss value due to the external heat transferred into the container due to the thermal insulation performance of the container material during the liquid nitrogen vaporization process are marked as vaporization area data and vaporization heat data, respectively, and compared with the area ratio threshold and heat loss threshold, respectively:

[0054] If the ratio of the liquid nitrogen contact surface area of the real-time liquid nitrogen container to the container surface area during the liquid nitrogen vaporization process does not exceed the area ratio threshold, or if the heat loss value of the external heat transmitted into the container due to the thermal insulation performance of the container material exceeds the heat loss threshold during the liquid nitrogen vaporization process, it is inferred that the monitoring of the corresponding container during the liquid nitrogen vaporization process has failed, and a container non-adaptive vaporization signal is generated and sent to the dynamic monitoring center. After receiving the container non-adaptive vaporization signal, the dynamic monitoring center adjusts the internal area of the container. At the same time, if the external heat transmission loss value of the container exceeds the set threshold, the corresponding container is set as a liquid nitrogen storage container and not as a vaporization container.

[0055] If the ratio of the liquid nitrogen contact surface area of the real-time liquid nitrogen container to the container surface area during the liquid nitrogen vaporization process exceeds the area ratio threshold, and the heat loss value of the container material corresponding to the external heat transferred into the container during the liquid nitrogen vaporization process does not exceed the heat loss threshold, then it is inferred that the liquid nitrogen vaporization process corresponding to the container monitoring is qualified, and a container adaptation vaporization signal is generated and sent to the dynamic monitoring center;

[0056] After the containment vessel is monitored and adapted, a ventilation status monitoring signal is generated and sent to the ventilation status monitoring unit. After receiving the ventilation status monitoring signal, the ventilation status monitoring unit monitors the ventilation status of the surrounding environment during the liquid nitrogen vaporization process. Through the ventilation status monitoring, it is inferred whether the surrounding environment of the current liquid nitrogen vaporization is suitable for liquid nitrogen vaporization. This avoids poor ventilation conditions in the surrounding environment, which may cause the nitrogen generated by liquid nitrogen vaporization to be not removed in time, resulting in an increase in the nitrogen content in the environment in the containment vessel area, a decrease in the nitrogen partial pressure around the liquid nitrogen, and a hindrance to the vaporization reaction.

[0057] Obtain a speed ratio of the air circulation velocity of the surrounding environment of the vaporization execution area to the speed of the increase in nitrogen content during the liquid nitrogen vaporization process. Also obtain a speed ratio of the speed of the increase in the nitrogen content increase span in the vaporization execution area to the speed of the decrease in the nitrogen production rate during the vaporization process. Compare these speed ratios to the flow velocity information and the nitrogen production rate information, and to the flow velocity ratio threshold and the lifting velocity ratio threshold, respectively.

[0058] If the ratio of the air circulation speed of the surrounding environment of the vaporization execution area to the speed corresponding to the nitrogen content rising speed during the liquid nitrogen vaporization process exceeds the flow rate ratio threshold, and the ratio of the speed corresponding to the increase speed of the nitrogen content rising span in the vaporization execution area to the speed corresponding to the decrease value of the vaporization nitrogen generation rate during the liquid nitrogen vaporization process does not exceed the rise and fall speed ratio threshold, it is inferred that the ventilation state in the current liquid nitrogen vaporization process has no impact, and a ventilation no impact signal is generated and sent to the dynamic monitoring center;

[0059] If the ratio of the air circulation speed of the surrounding environment of the vaporization execution area to the speed corresponding to the nitrogen content rising speed during the liquid nitrogen vaporization process does not exceed the flow rate ratio threshold, or the ratio of the speed corresponding to the increase speed of the nitrogen content rising span in the vaporization execution area to the decrease value of the nitrogen generated by vaporization during the liquid nitrogen vaporization process exceeds the rise and fall speed ratio threshold, it is inferred that the ventilation state in the current liquid nitrogen vaporization process is affected, and a ventilation affected signal is generated and sent to the dynamic monitoring center. After receiving the ventilation state affected signal, the dynamic monitoring center performs ventilation control on the current liquid nitrogen vaporization area;

[0060] When the present invention is in use, the real-time state monitoring unit monitors the liquid nitrogen vaporization state in real time, monitors the liquid nitrogen vaporization process in real time through a high-speed camera, and monitors and analyzes bubble formation, bubble growth, and bubble escape in the liquid nitrogen vaporization process based on monitoring images; the ambient temperature area monitoring unit monitors the ambient temperature area of liquid nitrogen vaporization, and infers whether the liquid nitrogen vaporization state is qualified based on data analysis; the carrier container monitoring unit monitors and analyzes the carrier container, and infers whether the carrier container monitoring is qualified based on data analysis; the ventilation state monitoring unit monitors the ventilation state of the surrounding environment, collects circulation speed information and nitrogen production rate information, and infers whether the ventilation state has an impact on the current liquid nitrogen vaporization process based on information analysis.

[0061] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A liquid nitrogen vaporization process dynamic monitoring and control system, characterized in that: It includes a dynamic monitoring center, which is communicatively connected to an ambient temperature area monitoring unit, a real-time status monitoring unit, a carrying container monitoring unit, and a ventilation status monitoring unit; The real-time status monitoring unit monitors the vaporization status of liquid nitrogen in real time. The high-speed camera monitors the vaporization process of liquid nitrogen in real time and monitors and analyzes the bubble formation, bubble growth and bubble escape during the vaporization process of liquid nitrogen based on the monitoring images. The ambient temperature area monitoring unit monitors the ambient temperature area of liquid nitrogen vaporization, taking the liquid nitrogen vaporization container as the area center and obtaining various types of area labels based on the area center. Temperature impact analysis is performed through each type of area analysis. After completion, tank area floating data and tank area impact data are collected. Based on the data analysis, it is inferred whether the liquid nitrogen vaporization state is qualified. If yes, the next step is carried out; if not, regulation is carried out. The containment vessel monitoring unit monitors and analyzes the containment vessel, collects vaporization area data and vaporization heat data, and infers whether the containment vessel monitoring is qualified based on the data analysis. If yes, it proceeds to the next step; if not, it performs container control. The ventilation status monitoring unit monitors the ventilation status of the surrounding environment, collects circulation speed information and nitrogen production rate information, and infers whether the ventilation status has an impact on the current liquid nitrogen vaporization process based on information analysis. If so, ventilation control is performed; otherwise, the monitoring cycle is completed.

2. A liquid nitrogen vaporization process dynamic monitoring and control system according to claim 1, characterized in that: The process of the ambient temperature area monitoring unit is as follows: Collect gas conversion data and gas formation data. If the gas conversion data exceeds the continuously increasing span threshold, and the gas formation data exceeds the periodically decreasing span threshold, the current moment is marked as an effective vaporization moment. If the gas conversion data does not exceed the continuously increasing span threshold, or the gas formation data exceeds the periodically decreasing span threshold, the current moment is marked as an inefficient vaporization moment. The corresponding moment types in the current vaporization period are analyzed. If the proportion of the number of effective vaporization moments exceeds the proportion of the number of inefficient vaporization moments, and the consecutive number of effective vaporization moments exceeds the set threshold, a vaporization stable signal is generated; if the proportion of the number of effective vaporization moments does not exceed the proportion of the number of inefficient vaporization moments, or the consecutive number of effective vaporization moments does not exceed the set number threshold, a vaporization unstable signal is generated.

3. A liquid nitrogen vaporization process dynamic monitoring and control system according to claim 2, characterized in that: The gas conversion data and gas formation data are the continuous growth span of the bubble formation frequency on the liquid nitrogen surface during the stage when the required temperature is adjusted to the set temperature and the corresponding reduction span of the bubble growth cycle on the liquid nitrogen surface, respectively.

4. A liquid nitrogen vaporization process dynamic monitoring and control system according to claim 1, characterized in that: The temperature impact analysis process is as follows: The temperature values of each area within the center of the current area are collected. If the temperature values are consistent, they are considered to be the same area. If there are deviations in the temperature values, they are divided into different areas. Before vaporization is performed, liquid nitrogen enters the container, and the temperature values of the area are monitored with the center of the area as the origin. The area with a lower temperature value is marked as the liquid nitrogen affected area; and the area outside the liquid nitrogen affected area is marked as the unaffected area. If the area affected by liquid nitrogen exceeds the same area, multiple floating risk signals will be generated; If the liquid nitrogen affected area does not exceed the same area, a low floating risk signal is generated.

5. A liquid nitrogen vaporization process dynamic monitoring and control system according to claim 4, characterized in that: After completing the temperature impact analysis, the tank area floating data and tank area impact data are collected. If the tank area floating data does not exceed the interval value shortening speed threshold, or the tank area impact data exceeds the temperature rise speed reduction threshold, a high impact signal of the ambient temperature area is generated; if the tank area floating data exceeds the interval value shortening speed threshold, and the tank area impact data does not exceed the temperature rise speed reduction threshold, a low impact signal of the ambient temperature area is generated.

6. A liquid nitrogen vaporization process dynamic monitoring and control system according to claim 5, characterized in that: The tank area floating data and tank area impact data are respectively the shortening rate of the interval between the average temperature of the liquid nitrogen impact area of the liquid nitrogen vaporization container and the average temperature of the current area before the liquid nitrogen enters the container, and the reduction in the rising rate of the ambient temperature in the same area when the ambient temperature in different areas of the liquid nitrogen vaporization container decreases.

7. The liquid nitrogen vaporization process dynamic monitoring and control system according to claim 1, characterized in that: The vaporization area data and vaporization heat data are respectively the ratio of the liquid nitrogen contact surface area of the real-time liquid nitrogen-carrying container to the container surface area during the liquid nitrogen vaporization process, and the heat loss value of the external heat transferred into the container corresponding to the thermal insulation performance of the carrying container material during the liquid nitrogen vaporization process.

8. A liquid nitrogen vaporization process dynamic monitoring and control system according to claim 7, characterized in that: If the vaporization area data does not exceed the area ratio threshold, or the vaporization heat data exceeds the heat loss threshold, a container non-adaptive vaporization signal is generated; if the vaporization area data exceeds the area ratio threshold and the vaporization heat data does not exceed the heat loss threshold, a container adaptive vaporization signal is generated.

9. The liquid nitrogen vaporization process dynamic monitoring and control system according to claim 1, characterized in that: The circulation velocity information and nitrogen production rate information are respectively the ratio of the air circulation velocity in the surrounding environment of the vaporization execution area during the liquid nitrogen vaporization process to the corresponding speed value of the nitrogen content rising speed, and the ratio of the corresponding speed value of the nitrogen content rising span increasing speed in the vaporization execution area during the liquid nitrogen vaporization process to the corresponding speed value of the decreasing value of the vaporization nitrogen production rate.

10. A liquid nitrogen vaporization process dynamic monitoring and control system according to claim 9, characterized in that: If the circulation velocity information exceeds the flow rate ratio threshold and the nitrogen production rate information does not exceed the lifting and lowering velocity ratio threshold, a ventilation no-impact signal is generated; if the circulation velocity information does not exceed the flow rate ratio threshold, or the liquid nitrogen production rate information exceeds the lifting and lowering velocity ratio threshold, a ventilation impact signal is generated.

Images