Ship methanol leakage monitoring and control system and method based on digital twinning

Abstract

The invention discloses a ship methanol leakage monitoring and control system and method based on digital twinning in the technical field of ships. The system comprises a field monitoring system, an intelligent control system and a digital twin system, after detecting methanol leakage, the field monitoring system transmits field environment data to the intelligent control system; the intelligent control system transmits field environment data to the digital twinning system, and the digital twinning system inputs the field environment data into numerical simulation for simulation calculation to judge whether the ventilation condition of the current cabin meets the personnel safety of the cabin or not. Meanwhile, whether the methanol gas released in the current environment meets the personnel safety of the built living quarter or not is judged, if not, the parameters are adjusted through simulation till the personnel safety is met, and the parameter adjusting module transmits the parameters meeting the personnel safety to the intelligent control system. The method has the advantages that simulation and judgment are conducted through numerical simulation, field parameters are optimized, energy-saving and efficient cleaning of methanol leakage is achieved, and safety is improved.

Description

Technical Field

[0001] The present invention relates to the field of ship technology, and in particular to a ship methanol leakage monitoring and control system and method based on digital twins. Background Art

[0002] Methanol dual-fuel vessels can significantly reduce exhaust emissions and offer distinct advantages in combustion efficiency, effectively lowering fuel consumption and operating costs, making them a key alternative fuel. However, the transportation and use of methanol present safety risks, including its toxicity and flammability. Methanol leaks pose a threat to crew members in the cabin, and the release of methanol gas can also impact the safety of living quarters above the vessel.

[0003] Currently, the existing methanol leakage monitoring system is still in its infancy and faces the following problems: after the monitoring system detects the leakage of methanol gas, it is difficult to effectively ventilate the cabin. Excessive exhaust not only consumes energy, but also makes it difficult to remove methanol accumulation in ventilation blind spots. Summary of the Invention

[0004] The purpose of the present invention is to address the existing deficiencies and provide a ship methanol leakage monitoring and control system and method based on digital twins. Through numerical simulation, the ventilation conditions of the cabin and the methanol release conditions of the upper building are simulated and judged, thereby optimizing the on-site parameters to achieve energy-saving and efficient cleaning of methanol leaks and improve safety.

[0005] In order to achieve the above-mentioned purpose of the invention, the digital twin-based ship methanol leakage monitoring and control system and method adopt the following technical solutions:

[0006] A digital twin-based ship methanol leakage monitoring and control system, including: an on-site monitoring system, an intelligent control system, and a digital twin system;

[0007] The on-site monitoring system includes a cabin ventilation system, a superstructure ventilation system, an anemometer, and an onboard methanol detector. The cabin ventilation system includes an exhaust fan, a blower, and an air supply grille arranged in the cabin. The superstructure ventilation system includes a ventilation mast arranged on the superstructure. The anemometer is arranged on the superstructure and is used to detect the wind speed and direction around the ship. The onboard methanol detector is used to detect the methanol concentration at a detection point in the cabin.

[0008] After detecting a methanol leak through an onboard methanol detector, the on-site monitoring system transmits on-site environmental data to the intelligent control system. The on-site environmental data includes cabin data and upper-structure data. The cabin data includes cabin ventilation system parameters and methanol concentration at a detection point within the cabin. The upper-structure data includes upper-structure ventilation system parameters, as well as wind speed and direction around the ship. The cabin ventilation system parameters include ventilation volume, ventilation time, and purge angle. The ventilation volume is determined by controlling the speed of the blower, and the purge angle is determined by controlling the angle of the grille plate of the air supply grille. The upper-structure ventilation system parameters include the release pressure, release time, release speed, and release height of the ventilation mast.

[0009] The intelligent control system transmits the on-site environmental data to the digital twin system and regulates the on-site monitoring system through the parameters fed back by the digital twin system;

[0010] The digital twin system includes a numerical simulation and parameter adjustment module. The numerical simulation includes a cabin model and an upper building model. The digital twin system inputs the acquired on-site environmental data into the numerical simulation. The numerical simulation performs simulation calculations on the cabin model and the upper building model respectively to determine whether the ventilation conditions of the current cabin meet the safety of the cabin personnel, and at the same time determine whether the release of methanol gas in the current environment meets the safety of the personnel in the upper building living area. If not, the parameter adjustment module is used to simulate and adjust the parameters until the personnel safety is met. The parameter adjustment module transmits the parameters that meet the personnel safety to the intelligent control system.

[0011] Preferably, the numerical simulation determines the exhaust boundary and leakage boundary of the cabin based on the data of the on-site cabin, and carries out numerical simulation calculations through the CFD simulation method. If the calculation result exceeds the preset threshold of the cabin, it is determined that the ventilation conditions in the current cabin do not meet the safety of personnel. Then, the parameters of the cabin ventilation system are simulated and adjusted through the parameter adjustment module until the result of the numerical simulation calculation is less than the preset threshold of the cabin. At this time, it is determined that the ventilation conditions in the current cabin meet the safety of personnel.

[0012] Preferably, the numerical simulation establishes the flow field around the ship based on the data of the on-site construction, and at the same time carries out numerical simulation calculations through the CFD simulation method. If the calculation result does not exceed the preset threshold of the construction, the ventilation mast is controlled by the intelligent control system to directly release methanol; if the calculation result exceeds the preset threshold of the construction, it is judged that the release of methanol gas under the current environmental conditions will cause harm to the living area, and the parameters of the ventilation system of the construction are simulated and adjusted through the parameter adjustment module to ensure the safety of personnel in the living area of the construction.

[0013] Preferably, the preset threshold value of the cabin is 200 ppm.

[0014] Preferably, the preset threshold is 10%LEL.

[0015] Preferably, the numerical simulation also includes a full-ship visualization model, and the simulation calculation results are presented to the staff through the full-ship visualization model.

[0016] Preferably, the simulation adjustment method of the ventilation volume and ventilation time is to increase by 10% each time.

[0017] Preferably, the adjustment of the purge angle can avoid ventilation dead corners, which are low flow velocity areas. The low flow velocity areas can be presented to the staff through a full-ship visualization model.

[0018] Preferably, the on-site monitoring system further comprises an off-board methanol detector arranged on the superstructure, and the off-board methanol detector is used to verify and correct the results of the numerical simulation calculation.

[0019] A method for using a ship methanol leakage monitoring and control system based on digital twins includes the following steps:

[0020] The methanol detector onboard S1 detected a methanol leak, and the intelligent control system sent a signal to the digital twin system, which then input the acquired on-site environmental data into the numerical simulation.

[0021] The S2 numerical simulation determines the exhaust boundary and leakage boundary of the cabin based on the data from the blower, the methanol detector on board, the exhaust fan, and the air supply grille. At the same time, the numerical simulation establishes the flow field around the ship based on the wind speed and direction around the ship detected by the anemometer;

[0022] S3 uses CFD simulation method to carry out numerical simulation calculations on the cabin model and the superstructure model respectively;

[0023] S4: If the simulation calculation result of the cabin model does not exceed the cabin preset threshold of 200ppm, it is judged that the ventilation conditions in the current cabin meet the safety of personnel, and the calculation is stopped; if the simulation calculation result exceeds the cabin preset threshold of 200ppm, it is judged that the ventilation conditions in the current cabin do not meet the safety of personnel, and the parameters of the cabin ventilation system are simulated and adjusted through the parameter adjustment module until the result of the numerical simulation calculation is less than the cabin preset threshold of 200ppm. At this time, it is judged that the ventilation conditions in the current cabin meet the safety of personnel, and the calculation is stopped;

[0024] S5: If the simulation calculation result of the upper building model does not exceed the upper building preset threshold value of 10%LEL, it is judged that the release of methanol gas under the current environmental conditions will not cause harm to the upper building living area, and the calculation is stopped; if the simulation calculation result exceeds the upper building preset threshold value of 10%LEL, it is judged that the release of methanol gas under the current environmental conditions will cause harm to the upper building living area, and the parameters of the upper building ventilation system are simulated and adjusted through the parameter adjustment module until the result of the numerical simulation calculation is less than the upper building preset threshold value of 10%LEL. At this time, it is judged that the release of methanol gas under the current environment meets the safety of the personnel in the upper building living area, and then the calculation is stopped;

[0025] After S6 stops calculating, it passes the parameters that meet personnel safety requirements to the intelligent control system. If the parameters fed back by the digital twin system are consistent with the parameters of the cabin ventilation system, the cabin ventilation system maintains the current parameters; if the parameters fed back by the digital twin system are inconsistent with the parameters of the cabin ventilation system, the parameters of the cabin ventilation system are adjusted according to the parameters fed back by the digital twin system; if the parameters fed back by the digital twin system are consistent with the parameters of the upper-building ventilation system, the ventilation mast is controlled to directly release methanol gas; if the parameters fed back by the digital twin system are inconsistent with the parameters of the upper-building ventilation system, the parameters of the upper-building ventilation system are adjusted according to the parameters fed back by the digital twin system, and then the ventilation mast releases methanol gas according to the adjusted parameters.

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

[0027] The present invention uses digital twin technology to digitize the compartments and surrounding environment of methanol dual-fuel ships, making it easier for staff to detect and control methanol leakage more effectively. The numerical simulation module is used to predict the methanol distribution in the compartment model and the upper model, and simulate the adjustment of ventilation volume, ventilation angle, methanol release pressure and other parameters to ensure the safety of personnel in the current environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of a digital twin-based ship methanol leakage monitoring and control system of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further explained below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0030] like Figure 1As shown, a digital twin-based ship methanol leakage monitoring and control system includes: an on-site monitoring system, an intelligent control system, and a digital twin system; the on-site monitoring system includes a cabin ventilation system, a superstructure ventilation system, an anemometer, and an onboard methanol detector; the cabin ventilation system includes an exhaust fan, a supply fan, and an air grille installed in the cabin; the superstructure ventilation system includes a ventilation mast installed on the superstructure; the anemometer is installed on the superstructure and is used to detect the wind speed and direction around the ship; the onboard methanol detector is used to detect the methanol concentration at the detection point in the cabin; the onboard methanol detector is equipped with a tuned liquid damper to prevent temperature and vibration from affecting the service life of the onboard methanol detector;

[0031] After the on-site monitoring system detects methanol leakage through the onboard methanol detector, it transmits the on-site environmental data to the intelligent control system; the on-site environmental data includes cabin data and upper-structure data. The cabin data includes the parameters of the cabin ventilation system and the methanol concentration at the detection point in the cabin; the upper-structure data includes the parameters of the upper-structure ventilation system, as well as the wind speed and direction around the ship; the parameters of the cabin ventilation system include ventilation volume, ventilation time and purge angle. The ventilation volume is determined by controlling the speed of the blower, and the purge angle is determined by controlling the grille angle of the air supply grille. The air supply grille is installed at the air outlet of the blower. Adjusting the partition angle can change the wind direction to avoid ventilation dead corners; the parameters of the upper-structure ventilation system include the ventilation mast The release pressure, release time, release speed and release height of the ship are determined by the intelligent control system. The intelligent control system transmits the on-site environmental data to the digital twin system and adjusts the on-site monitoring system through the parameters fed back by the digital twin system. The digital twin system includes numerical simulation and parameter adjustment modules. The numerical simulation includes the cabin model and the superstructure model. The numerical simulation also includes a full-ship visualization model. The simulation calculation results are presented to the staff through the full-ship visualization model. When methanol leakage or detection instrument failure occurs, an alarm will be issued on the full-ship visualization model to remind maintenance personnel to carry out maintenance. The digital twin system inputs the acquired on-site environmental data into the numerical simulation, and the numerical simulation performs simulation calculations on the cabin model and the superstructure model respectively. The numerical simulation determines the exhaust boundary and leakage boundary of the cabin based on the data of the on-site cabin, and carries out numerical simulation calculations through the CFD simulation method. If the calculation result exceeds the preset threshold of the cabin, the preset threshold of the cabin is 200ppm. At this time, it is determined that the ventilation conditions in the current cabin do not meet the safety of personnel. Then the parameters of the cabin ventilation system are simulated and adjusted through the parameter adjustment module. The parameters of the cabin ventilation system include ventilation volume, ventilation time and purge angle. The ventilation volume is achieved by controlling the fan speed. The simulation adjustment method of ventilation volume and ventilation time is to increase by 10% each time. The adjustment of purge angle can avoid ventilation dead corners. Ventilation dead corners are low flow rate areas. The low flow rate areas can be presented to workers through the whole ship visualization model. The parameter adjustment module continuously simulates and adjusts the parameters of the cabin ventilation system until the result of the numerical simulation calculation is less than the preset threshold value of the cabin. At this time, it is determined that the ventilation conditions in the current cabin meet the safety of personnel. At the same time, the numerical simulation establishes the flow field around the ship based on the data of the on-site construction, that is, the ambient wind parameters, and determines the release boundary. The numerical simulation calculation is carried out through the CFD simulation method. The on-site monitoring system also includes an off-board methanol detector installed on the superstructure. The off-board methanol detector is used to verify and correct the results of the numerical simulation calculation. If the calculation result does not exceed the preset threshold value of the upper construction, which is 10% LEL, the intelligent control system controls the ventilation mast to directly release methanol.If the calculated result exceeds the preset threshold of the upper building, it is determined that the release of methanol gas under the current environmental conditions will cause harm to the living area. The parameter adjustment module will then simulate and adjust the parameters of the upper building ventilation system. The ventilation mast is equipped with a telescopic tube and an electric valve. The parameters of the upper building ventilation system are adjusted by adjusting the release pressure, release time, release speed, and release height of the ventilation mast. For example, if the current wind speed is low or the wind direction is unfavorable (such as towards the living area), reducing the release pressure can reduce the initial velocity of the methanol gas injection, avoid a sudden increase in local concentration, and reduce the flammability risk. When the wind speed is high or the wind direction is favorable, the release pressure can be increased, and the ambient airflow can be used to quickly dilute the methanol gas to ensure safety. Therefore, the parameter adjustment module adjusts the parameters of the upper building ventilation system according to the flow field around the ship to ensure the safety of personnel in the upper building living area. Finally, the parameter adjustment module transmits the parameters that meet the safety requirements to the intelligent control system.

[0032] A method for using a ship methanol leakage monitoring and control system based on digital twins includes the following steps:

[0033] The methanol detector onboard S1 detected a methanol leak, and the intelligent control system sent a signal to the digital twin system, which then input the acquired on-site environmental data into the numerical simulation.

[0034] The S2 numerical simulation determines the exhaust boundary and leakage boundary of the cabin based on the data from the blower, the methanol detector on board, the exhaust fan, and the air supply grille. At the same time, the numerical simulation establishes the flow field around the ship based on the wind speed and direction around the ship detected by the anemometer;

[0035] S3 uses CFD simulation method to carry out numerical simulation calculations on the cabin model and the superstructure model respectively;

[0036] S4: If the simulation calculation result of the cabin model does not exceed the cabin preset threshold of 200ppm, it is judged that the ventilation conditions in the current cabin meet the safety of personnel, and the calculation is stopped; if the simulation calculation result exceeds the cabin preset threshold of 200ppm, it is judged that the ventilation conditions in the current cabin do not meet the safety of personnel, and the parameters of the cabin ventilation system are simulated and adjusted through the parameter adjustment module until the result of the numerical simulation calculation is less than the cabin preset threshold of 200ppm. At this time, it is judged that the ventilation conditions in the current cabin meet the safety of personnel, and the calculation is stopped;

[0037] S5: If the simulation calculation result of the upper building model does not exceed the upper building preset threshold value of 10%LEL, it is judged that the release of methanol gas under the current environmental conditions will not cause harm to the upper building living area, and the calculation is stopped; if the simulation calculation result exceeds the upper building preset threshold value of 10%LEL, it is judged that the release of methanol gas under the current environmental conditions will cause harm to the upper building living area, and the parameters of the upper building ventilation system are simulated and adjusted through the parameter adjustment module until the result of the numerical simulation calculation is less than the upper building preset threshold value of 10%LEL. At this time, it is judged that the release of methanol gas under the current environment meets the safety of the personnel in the upper building living area, and then the calculation is stopped;

[0038] After S6 stops calculating, it passes the parameters that meet personnel safety requirements to the intelligent control system. If the parameters fed back by the digital twin system are consistent with the parameters of the cabin ventilation system, the cabin ventilation system maintains the current parameters; if the parameters fed back by the digital twin system are inconsistent with the parameters of the cabin ventilation system, the parameters of the cabin ventilation system are adjusted according to the parameters fed back by the digital twin system; if the parameters fed back by the digital twin system are consistent with the parameters of the upper-building ventilation system, the ventilation mast is controlled to directly release methanol gas; if the parameters fed back by the digital twin system are inconsistent with the parameters of the upper-building ventilation system, the parameters of the upper-building ventilation system are adjusted according to the parameters fed back by the digital twin system, and then the ventilation mast releases methanol gas according to the adjusted parameters.

[0039] The specific working process and principle of the present invention are as follows: the digital twin technology is used to digitize the various cabins and surrounding environment of the methanol dual-fuel ship, so that the staff can detect and control methanol leakage more effectively; the numerical simulation module is used to predict the methanol distribution of the cabin model and the upper model, and the ventilation volume, ventilation angle, methanol release pressure and other parameters are adjusted to ensure the safety of personnel and hull in the current environment; at the same time, a large database is established through the parameter adjustment module to continuously improve the prediction accuracy, optimization efficiency and feedback speed, form deep learning automatic monitoring, avoid the risks brought by human negligence, and ultimately realize the visualization, intelligence and automation of ship methanol leakage monitoring and control.

[0040] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0042] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept described herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A ship methanol leakage monitoring and control system based on digital twin, characterized by: include: Field monitoring systems, intelligent control systems, and digital twin systems; The on-site monitoring system includes a cabin ventilation system, a superstructure ventilation system, an anemometer, and an onboard methanol detector. The cabin ventilation system includes an exhaust fan, a blower, and an air supply grille arranged in the cabin. The superstructure ventilation system includes a ventilation mast arranged on the superstructure. The anemometer is arranged on the superstructure and is used to detect the wind speed and direction around the ship. The onboard methanol detector is used to detect the methanol concentration at a detection point in the cabin. After detecting a methanol leak through an onboard methanol detector, the on-site monitoring system transmits on-site environmental data to the intelligent control system. The on-site environmental data includes cabin data and upper-structure data. The cabin data includes cabin ventilation system parameters and methanol concentration at a detection point within the cabin. The upper-structure data includes upper-structure ventilation system parameters, as well as wind speed and direction around the ship. The cabin ventilation system parameters include ventilation volume, ventilation time, and purge angle. The ventilation volume is determined by controlling the speed of the blower, and the purge angle is determined by controlling the angle of the grille plate of the air supply grille. The upper-structure ventilation system parameters include the release pressure, release time, release speed, and release height of the ventilation mast. The intelligent control system transmits the on-site environmental data to the digital twin system and regulates the on-site monitoring system through the parameters fed back by the digital twin system; The digital twin system includes a numerical simulation and parameter adjustment module. The numerical simulation includes a cabin model and an upper building model. The digital twin system inputs the acquired on-site environmental data into the numerical simulation. The numerical simulation performs simulation calculations on the cabin model and the upper building model respectively to determine whether the ventilation conditions of the current cabin meet the safety of the cabin personnel, and at the same time determine whether the release of methanol gas in the current environment meets the safety of the personnel in the upper building living area. If not, the parameter adjustment module is used to simulate and adjust the parameters until the personnel safety is met. The parameter adjustment module transmits the parameters that meet the personnel safety to the intelligent control system.

2. The digital twin-based ship methanol leakage monitoring and control system according to claim 1 is characterized by: The numerical simulation determines the exhaust boundary and leakage boundary of the cabin based on the data of the on-site cabin, and carries out numerical simulation calculations through the CFD simulation method. If the calculation result exceeds the preset threshold of the cabin, it is determined that the ventilation conditions in the current cabin do not meet the safety of personnel. Then, the parameters of the cabin ventilation system are simulated and adjusted through the parameter adjustment module until the result of the numerical simulation calculation is less than the preset threshold of the cabin. At this time, it is determined that the ventilation conditions in the current cabin meet the safety of personnel.

3. The digital twin-based ship methanol leakage monitoring and control system according to claim 1 is characterized in that: The numerical simulation establishes the flow field around the ship based on the on-site data, and simultaneously carries out numerical simulation calculations using the CFD simulation method. If the calculation result does not exceed the preset threshold value of the on-site data, the intelligent control system controls the vent mast to directly release methanol. If the calculated result exceeds the preset threshold of the upper building, it is judged that the release of methanol gas under the current environmental conditions will cause harm to the living area. In this case, the parameters of the upper building ventilation system will be adjusted through the parameter adjustment module to ensure the safety of the personnel in the upper building living area.

4. The digital twin-based ship methanol leakage monitoring and control system according to claim 2 is characterized in that: The cabin preset threshold is 200ppm.

5. The digital twin-based ship methanol leakage monitoring and control system according to claim 3 is characterized by: The upper preset threshold is 10% LEL.

6. The digital twin-based ship methanol leakage monitoring and control system according to claim 1 is characterized by: The numerical simulation also includes a full-ship visualization model, and the simulation calculation results are presented to the staff through the full-ship visualization model.

7. The digital twin-based ship methanol leakage monitoring and control system according to claim 1 is characterized by: The simulation adjustment method of the ventilation volume and ventilation time is to increase by 10% each time.

8. The digital twin-based ship methanol leakage monitoring and control system according to claim 6 is characterized by: The adjustment of the purge angle can avoid ventilation dead corners, which are low flow velocity areas. The low flow velocity areas can be presented to the staff through a full-ship visualization model.

9. The digital twin-based ship methanol leakage monitoring and control system according to claim 5, characterized in that: The on-site monitoring system further comprises an off-board methanol detector arranged on the superstructure, and the off-board methanol detector is used to verify and correct the results of the numerical simulation calculation.

10. A method for using the digital twin-based ship methanol leakage monitoring and control system according to any one of claims 1 to 9, characterized in that: The steps include: The methanol detector onboard S1 detected a methanol leak, and the intelligent control system sent a signal to the digital twin system, which then input the acquired on-site environmental data into the numerical simulation. The S2 numerical simulation determines the exhaust boundary and leakage boundary of the cabin based on the data from the blower, the methanol detector on board, the exhaust fan, and the air supply grille. At the same time, the numerical simulation establishes the flow field around the ship based on the wind speed and direction around the ship detected by the anemometer; S3 uses CFD simulation method to carry out numerical simulation calculations on the cabin model and the superstructure model respectively; S4: If the simulation calculation result of the cabin model does not exceed the cabin preset threshold of 200ppm, it is judged that the ventilation conditions in the current cabin meet the safety of personnel, and the calculation is stopped; if the simulation calculation result exceeds the cabin preset threshold of 200ppm, it is judged that the ventilation conditions in the current cabin do not meet the safety of personnel, and the parameters of the cabin ventilation system are simulated and adjusted through the parameter adjustment module until the result of the numerical simulation calculation is less than the cabin preset threshold of 200ppm. At this time, it is judged that the ventilation conditions in the current cabin meet the safety of personnel, and the calculation is stopped; S5: If the simulation calculation result of the upper building model does not exceed the upper building preset threshold value of 10%LEL, it is judged that the release of methanol gas under the current environmental conditions will not cause harm to the upper building living area, and the calculation is stopped; if the simulation calculation result exceeds the upper building preset threshold value of 10%LEL, it is judged that the release of methanol gas under the current environmental conditions will cause harm to the upper building living area, and the parameters of the upper building ventilation system are simulated and adjusted through the parameter adjustment module until the result of the numerical simulation calculation is less than the upper building preset threshold value of 10%LEL. At this time, it is judged that the release of methanol gas under the current environment meets the safety of the personnel in the upper building living area, and then the calculation is stopped; After S6 stops calculating, it passes the parameters that meet personnel safety requirements to the intelligent control system. If the parameters fed back by the digital twin system are consistent with the parameters of the cabin ventilation system, the cabin ventilation system maintains the current parameters; if the parameters fed back by the digital twin system are inconsistent with the parameters of the cabin ventilation system, the parameters of the cabin ventilation system are adjusted according to the parameters fed back by the digital twin system; if the parameters fed back by the digital twin system are consistent with the parameters of the upper-building ventilation system, the ventilation mast is controlled to directly release methanol gas; if the parameters fed back by the digital twin system are inconsistent with the parameters of the upper-building ventilation system, the parameters of the upper-building ventilation system are adjusted according to the parameters fed back by the digital twin system, and then the ventilation mast releases methanol gas according to the adjusted parameters.

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