Dynamic monitoring control system for liquid nitrogen vaporization process

Abstract

The invention discloses a dynamic monitoring control system for a liquid nitrogen vaporization process, relates to the technical field of liquid nitrogen vaporization monitoring, solves the technical problem that liquid nitrogen vaporization cannot be regulated and controlled in advance due to the fact that environment monitoring cannot be performed in real time in the prior art, and particularly provides a dynamic monitoring control system for the liquid nitrogen vaporization process. The liquid nitrogen vaporization process is monitored in real time through a high-speed camera, and bubble formation, bubble growth and bubble escape phenomena in the liquid nitrogen vaporization process are monitored and analyzed according to monitoring pictures; the method comprises the following steps: carrying out environment temperature area monitoring on liquid nitrogen vaporization, taking a liquid nitrogen vaporization container as an area center, obtaining various types of area marks according to the area center, carrying out temperature influence analysis through various types of area analysis, collecting tank body area floating data and tank body area influence data after the temperature influence analysis is finished, and inferring whether the liquid nitrogen vaporization state is qualified or not according to the data analysis. If yes, the next step is carried out, and if not, regulation and control are carried out.

Description

Technical Field

[0001] The 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 temperature (under standard atmospheric pressure, the boiling point of liquid nitrogen is -196°C); when the temperature of liquid nitrogen rises or the pressure of the environment decreases, liquid nitrogen will absorb heat and change from liquid to gas.

[0003] However, in the prior art, the vaporization state of liquid nitrogen itself cannot be monitored when it is vaporized, 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, and the environment cannot be monitored in real time, resulting in the inability to adjust the liquid nitrogen vaporization in advance. Finally, the type of the carrying 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 liquid nitrogen vaporization process dynamic monitoring and control system.

[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, comprising a dynamic monitoring center, the dynamic monitoring center being 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;

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

[0009] The ambient temperature area monitoring unit monitors the ambient temperature area of ​​liquid nitrogen vaporization, takes the liquid nitrogen vaporization container as the area center, and obtains various types of area marks based on the area center. The temperature impact analysis is performed through various types of area analysis. After the completion, the tank area floating data and tank area impact data are collected. According to the data analysis, it is inferred whether the liquid nitrogen vaporization state is qualified. If yes, it will proceed to the next step, otherwise, it will be regulated;

[0010] The container monitoring unit monitors and analyzes the container, collects vaporization area data and vaporization heat data, and infers whether the container monitoring is qualified based on data analysis. If yes, proceed to the next step, otherwise, perform container regulation;

[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; if not, the current 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 number proportion of effective vaporization moments exceeds the number proportion of inefficient vaporization moments, and the continuous number of effective vaporization moments exceeds the set threshold, a vaporization stable signal is generated; if the number proportion of effective vaporization moments does not exceed the number proportion of inefficient vaporization moments, or the continuous 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 corresponding to the stage of adjusting the required temperature 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, and 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. Before the 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, and 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 area affected by liquid nitrogen 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 of non-same 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 transmitted 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 speed information and the nitrogen production rate information are respectively the speed value ratio of the air circulation speed in the surrounding environment of the vaporization execution area during the liquid nitrogen vaporization process to the corresponding speed value ratio of the nitrogen content rising span increase speed in the vaporization execution area during the liquid nitrogen vaporization process to the corresponding speed value ratio of the decreasing 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 the real-time vaporization conversion amount of liquid nitrogen;

[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 to effectively improve the efficiency of liquid nitrogen vaporization. Environmental impacts can also be discovered in time 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 carrier container is monitored and analyzed, and the analysis of the carrier container is used to infer whether there is any container influence on the current liquid nitrogen vaporization, so as to facilitate real-time monitoring to ensure the high efficiency of liquid nitrogen vaporization, and facilitate real-time monitoring of the carrier container during the liquid nitrogen vaporization process to avoid the carrier container affecting the liquid nitrogen vaporization efficiency. The safety of liquid nitrogen vaporization can be improved through real-time monitoring, and it can also ensure that the carrier container of liquid nitrogen vaporization will not have any influence;

[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, so as to avoid poor ventilation conditions in the surrounding environment. The nitrogen generated by liquid nitrogen vaporization is not removed in time, which increases the nitrogen content in the environment of the carrying container and reduces the nitrogen partial pressure around the liquid nitrogen, which is not conducive to the vaporization reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order 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 It is a system principle block diagram of the present invention;

[0033] Figure 2 The present invention is a method flow chart of the system. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood 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 liquid nitrogen vaporization process dynamic monitoring and control system 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 the 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 the 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 in the liquid nitrogen vaporization process are monitored and analyzed based on the monitoring pictures;

[0039] During the liquid nitrogen vaporization process, the continuous growth span of the bubble formation frequency on the liquid nitrogen surface and the corresponding liquid nitrogen surface bubble growth cycle reduction span are obtained during the stage when the required temperature is adjusted to the set temperature, and the continuous growth span of the bubble formation frequency on the liquid nitrogen surface and the corresponding liquid nitrogen surface bubble growth cycle reduction span 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 cycle reduction span threshold respectively:

[0040] If the gas conversion data exceeds the continuously increasing span threshold, and the gas formation 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 number of effective vaporization moments exceeds the number of inefficient vaporization moments, and the consecutive number of effective vaporization moments exceeds the set threshold, it is inferred that the real-time state 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 number ratio of effective vaporization moments does not exceed the number ratio 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 state 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. Through the ambient temperature area monitoring, it is inferred whether the surrounding environment affects the current liquid nitrogen vaporization process. It can also be combined with the ambient temperature monitoring to infer the real-time state of the current liquid nitrogen vaporization. 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 time through environmental monitoring, and liquid nitrogen vaporization can be adjusted in advance, reducing the risk of efficiency reduction during liquid nitrogen vaporization.

[0045] Take the liquid nitrogen vaporization container as the regional center, collect the temperature values ​​of each area within the current regional center, and 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 outside the center is the same, the corresponding area is the same, otherwise it is a different area. If the same area is determined and there are also non-identical areas adjacent to it, the regional division ends, 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, and 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;

[0047] After collecting the liquid nitrogen entering the container, the corresponding liquid nitrogen affected area is compared with the same area of ​​the surrounding environment. If the liquid nitrogen affected area exceeds the same area, it is inferred that there is a multi-floating risk in the temperature of the surrounding area, and a multi-floating risk signal is generated and sent to the dynamic monitoring platform. After the dynamic monitoring platform receives the multi-floating risk signal, it 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 multiple floating risk in the temperature of the surrounding area, and a low floating risk signal is generated and sent to the dynamic monitoring platform. After the dynamic monitoring platform receives the low floating risk signal, it collects the surrounding environment temperature according to the number of threshold points after the liquid nitrogen vaporization is executed;

[0049] After completing the temperature impact analysis, the liquid nitrogen enters the container and begins to vaporize. The storage environment temperature is increased manually. During the liquid nitrogen vaporization process, the shortening speed 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 in the non-same area of ​​the liquid nitrogen vaporization container is obtained. The shortening speed 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 in the non-same area 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 speed threshold and the temperature rise speed reduction threshold, respectively:

[0050] If the interval value shortening speed 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 speed threshold, or when the ambient temperature of the non-same area of ​​the liquid nitrogen vaporization container decreases, the corresponding ambient temperature rise speed reduction amount in the same area exceeds the temperature rise speed 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 regulates the range of the artificial temperature control coverage tank of the current vaporization container to avoid the vaporization efficiency being affected by inconsistent temperature fluctuations of the tank body;

[0051] If the interval value shortening speed 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 exceeds the interval value shortening speed threshold, and the corresponding decrease in the ambient temperature rise rate of the same area when the ambient temperature of the liquid nitrogen vaporization container in a different area decreases does not exceed the temperature rise rate reduction threshold, it is inferred that the current liquid nitrogen vaporization state is qualified, and a low-impact signal of 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 container monitoring signal is generated and sent to the containment container monitoring unit. After receiving the containment container monitoring signal, the containment container monitoring unit monitors and analyzes the containment container, and infers whether there is a container impact on the current liquid nitrogen vaporization through the containment container analysis, so as to facilitate real-time monitoring to ensure the high efficiency of liquid nitrogen vaporization, and facilitate real-time monitoring of the containment container during the liquid nitrogen vaporization process to avoid the containment container affecting the liquid nitrogen vaporization efficiency. The real-time monitoring can improve the safety of liquid nitrogen vaporization and ensure that the containment container of liquid nitrogen vaporization will not have an impact.

[0053] The area 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 is obtained, and the heat loss value of the external heat transmitted into the container corresponding to the thermal insulation performance of the container material during the liquid nitrogen vaporization process is obtained. The area 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 and the heat loss value of the external heat transmitted into the container corresponding 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 the heat loss threshold, respectively:

[0054] If the area ratio of the liquid nitrogen contact surface area corresponding to the real-time liquid nitrogen carrying container to the container surface area during the liquid nitrogen vaporization process does not exceed the area ratio threshold, or the heat loss value of the heat insulation performance of the carrying container material corresponding to the external heat transmitted into the container during the liquid nitrogen vaporization process exceeds the heat loss threshold, it is inferred that the monitoring of the corresponding carrying container in the liquid nitrogen vaporization process is unqualified, 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 carrying container, and 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, not as a vaporization container;

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

[0056] After the monitoring and adaptation of the carrier container is completed, a ventilation state monitoring signal is generated and sent to the ventilation state monitoring unit. After receiving the ventilation state monitoring signal, the ventilation state monitoring unit monitors the ventilation state of the surrounding environment during the liquid nitrogen vaporization process. Through the ventilation state monitoring, it is inferred whether the surrounding environment of the current liquid nitrogen vaporization is suitable for liquid nitrogen vaporization, so as to avoid poor ventilation conditions in the surrounding environment, and the nitrogen generated by the liquid nitrogen vaporization is not taken away in time, so that the nitrogen content in the environment of the area where the carrier container is located increases, and the nitrogen partial pressure around the liquid nitrogen is reduced, which is not conducive to the vaporization reaction;

[0057] The speed value ratio of the air circulation speed of the surrounding environment of the vaporization execution area to the nitrogen content rising speed in the process of liquid nitrogen vaporization is obtained, and the speed value ratio of the corresponding nitrogen content rising span increase speed in the vaporization execution area to the decreasing value of the vaporization nitrogen generation rate is obtained. The speed value ratio of the air circulation speed of the surrounding environment of the vaporization execution area to the nitrogen content rising speed in the process of liquid nitrogen vaporization and the speed value ratio of the corresponding nitrogen content rising span increase speed in the vaporization execution area to the decreasing value of the vaporization nitrogen generation rate are compared with the circulation speed information and the nitrogen production rate information, and are compared with the flow rate ratio threshold and the lifting speed 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 nitrogen content rising span increase speed in the vaporization execution area to the decreasing value of the nitrogen generation rate of vaporization during the liquid nitrogen vaporization process does not exceed the rise and fall speed ratio threshold, it is inferred that the ventilation state has no effect during the current liquid nitrogen vaporization process, and a ventilation no-effect 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 nitrogen content rising span increase speed in the vaporization execution area to the decreasing value of the nitrogen generation rate of vaporization during the liquid nitrogen vaporization process exceeds the lifting and lowering speed ratio threshold, it is inferred that the ventilation state is affected in the current liquid nitrogen vaporization process, 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 vaporization state of liquid nitrogen 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 according to monitoring pictures; 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 according to data analysis; the carrying container monitoring unit monitors and analyzes the carrying container, and infers whether the carrying container monitoring is qualified according to data analysis; the ventilation state monitoring unit monitors the ventilation state of the surrounding environment, collects circulation speed information and nitrogen production speed information, and infers whether the ventilation state has an impact on the current liquid nitrogen vaporization process according to information analysis.

[0061] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. 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, monitors the vaporization process of liquid nitrogen in real time through a high-speed camera, and monitors and analyzes the bubble formation, bubble growth and bubble escape during the vaporization process of liquid nitrogen based on the monitoring pictures; The ambient temperature area monitoring unit monitors the ambient temperature area of ​​liquid nitrogen vaporization, takes the liquid nitrogen vaporization container as the area center, and obtains various types of area marks based on the area center. The temperature impact analysis is performed through various types of area analysis. After the completion, the tank area floating data and tank area impact data are collected. According to the data analysis, it is inferred whether the liquid nitrogen vaporization state is qualified. If yes, it will proceed to the next step, otherwise, it will be regulated; The container monitoring unit monitors and analyzes the container, collects vaporization area data and vaporization heat data, and infers whether the container monitoring is qualified based on data analysis. If yes, proceed to the next step, otherwise, perform container regulation; 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; if not, the current 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 number proportion of effective vaporization moments exceeds the number proportion of inefficient vaporization moments, and the continuous number of effective vaporization moments exceeds the set threshold, a vaporization stable signal is generated; if the number proportion of effective vaporization moments does not exceed the number proportion of inefficient vaporization moments, or the continuous 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 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.

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, and 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. Before the 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, and 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 area affected by liquid nitrogen 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 non-same areas of the liquid nitrogen vaporization container decreases.

7. A 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 the 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 ratio of the nitrogen content rising speed, and the ratio of the corresponding speed value ratio of the nitrogen content rising span increase speed in the vaporization execution area during the liquid nitrogen vaporization process to the corresponding speed value ratio of the decrease 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 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.

Images