Marine lng spill analysis and personnel evacuation guidance device system and method

Abstract

The application provides a ship liquefied natural gas leakage analysis and personnel evacuation guiding device system and method, and belongs to the technical field of ship safety. The ship liquefied natural gas leakage analysis and personnel evacuation guiding method first monitors whether liquefied natural gas leakage occurs on the ship. If leakage occurs, the leakage state parameters of the liquefied natural gas and the current environmental data of the sea area where the ship is located are collected. Then, according to the leakage state parameters and the environmental data, and whether the liquefied natural gas is combusting and exploding, different leakage consequence databases are matched to obtain corresponding leakage consequence conditions, and finally a safe personnel evacuation route is given to guide the personnel on the ship to evacuate quickly, thereby improving the safety of the ship when liquefied natural gas leaks.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship safety, and in particular to a ship liquefied natural gas leakage analysis and personnel evacuation guiding device system and method. BACKGROUND

[0002] With the wide application of liquefied natural gas as a ship fuel, the leakage accidents that may occur during its transportation and storage become an important safety hazard. Liquefied natural gas leakage not only may cause environmental pollution, but also may trigger secondary disasters such as fire and explosion, posing a great threat to the life safety of personnel on the ship. The traditional ship safety system has certain limitations in the monitoring of liquefied natural gas leakage, for example, the monitoring means is not comprehensive enough, the comprehensive consideration of environmental factors is insufficient, and the consequences that may be caused by liquefied natural gas after leakage are different due to the type of leakage and the type of ignition source, resulting in certain limitations in simulating the consequences after leakage, and it is difficult to accurately judge the consequences after leakage and provide effective personnel evacuation guidance. When an accident occurs, it is difficult to provide safe evacuation routes for personnel on the ship in a timely and accurate manner, which may result in personnel casualties and property losses.

[0003] CN104792661A discloses a liquefied natural gas leakage and diffusion fire integrated experimental platform, which includes an experimental field and a combustible gas alarm instrument outside the experimental field. The experimental field includes a liquefied natural gas storage and transportation system, a liquid pool experimental system, a measurement and control system, and a safety protection system. Each system cooperates with each other. The liquefied natural gas storage tank delivers liquefied natural gas through an adiabatic hose across a fireproof wall. The adiabatic hose is connected to different liquid pools or liquefied natural gas grooves. When experiments are conducted in the liquid pools and liquefied natural gas grooves, various experimental data are collected through various sensors and infrared cameras distributed in the experimental field, and the measurement of the liquefied natural gas diffusion temperature field, the methane concentration distribution, the liquefied natural gas combustion temperature field, and the thermal radiation field is realized. The evaporation and diffusion characteristics and the combustion characteristics of liquefied natural gas are deeply studied, and data support is provided for the safety arrangement of liquefied natural gas stations and the research on liquefied natural gas diffusion fire suppression technology.

[0004] CN216053385U discloses a liquefied natural gas leakage accident simulation training system, which includes a material storage module, a material release control module, and a leakage simulation module. The material storage module stores natural gas and liquid nitrogen. The material storage module is connected to the material release control module. The material release control module is connected to the leakage simulation module. The material release control module transports the natural gas or liquid nitrogen in the material storage module to the leakage point on the leakage simulation module.

[0005] However, the above experimental platform and simulation training system do not comprehensively consider various environmental conditions encountered during actual sea navigation, and are not suitable for ship liquefied natural gas leakage analysis and processing.

[0006] Therefore, it is urgent to provide a system capable of monitoring liquefied natural gas leakage state of a ship in real time, comprehensively considering environmental factors, accurately matching leakage consequences and effectively guiding personnel evacuation, so as to improve safety of the ship in the face of liquefied natural gas leakage accidents. SUMMARY

[0007] In view of the problems in the prior art, the present application provides a ship liquefied natural gas leakage analysis and personnel evacuation guiding device system and method, which collects leakage state parameters of liquefied natural gas and current environmental data of a sea area where the ship is located, accurately matches corresponding leakage consequence conditions in a leakage consequence database, and gives a safe personnel evacuation route, so that quick response can be achieved in the event of liquefied natural gas leakage of the ship, and personnel casualties and property losses can be reduced.

[0008] To achieve the above purpose, the present application adopts the following technical solutions:

[0009] In a first aspect, the present application provides a ship liquefied natural gas leakage analysis and personnel evacuation guiding method, which comprises the following steps:

[0010] (1) monitoring whether liquefied natural gas leakage occurs on the ship, and if leakage occurs, collecting leakage state parameters of liquefied natural gas and current environmental data of a sea area where the ship is located;

[0011] (2) matching corresponding leakage consequence conditions from a leakage consequence database according to the leakage state parameters and the environmental data, and giving a safe personnel evacuation route according to the leakage consequence conditions;

[0012] The leakage consequence database comprises a leakage diffusion consequence database and a combustion and explosion consequence database; if liquefied natural gas combustion and explosion does not occur, corresponding leakage consequence conditions are matched in the leakage diffusion consequence database; if liquefied natural gas combustion and explosion occurs, corresponding leakage consequence conditions are matched in the combustion and explosion consequence database;

[0013] (3) guiding personnel in the ship to evacuate according to the safe personnel evacuation route.

[0014] The ship liquefied natural gas leakage analysis and personnel evacuation guiding method provided by the application matches the collected real-time liquefied natural gas leakage state parameters and the current environmental data of the sea area where the ship is located, and whether the liquefied natural gas is combusted or exploded, in the previously established leakage consequence database to obtain the corresponding leakage diffusion consequence database or combustion explosion consequence database, accurately judges the danger degree and range of the leakage accident, and gives a safe personnel evacuation route, reduces the personnel casualties and property losses caused by the leakage accident, and improves the overall safety of the ship in the face of the liquefied natural gas leakage accident.

[0015] Preferably, the leakage state parameters of the liquefied natural gas in step (1) include the leakage form, the leakage aperture size, the leakage position, the leakage initial pressure and the leakage speed of the liquefied natural gas.

[0016] In the application, a high-definition camera can be used for video monitoring to confirm the leakage form and the leakage position; the leakage aperture size can be measured accurately by using image processing technology through image analysis software by shooting the leakage hole by the camera; the leakage initial pressure can be measured by installing a pressure sensor on the liquefied natural gas storage tank; and the leakage speed can be measured by installing a mass flow meter on the liquefied natural gas storage tank.

[0017] Preferably, the leakage form includes continuous leakage and instantaneous leakage.

[0018] Preferably, the environmental data in step (1) is collected by a ship weather instrument.

[0019] Preferably, the environmental data includes wind speed, wind direction, temperature, air pressure and atmospheric stability.

[0020] Preferably, the leakage consequence database is obtained by the following simulation steps:

[0021] (a) After a three-dimensional model of the ship is constructed according to the ship size, shape, cabin layout, liquefied natural gas storage tank position and liquefied natural gas storage tank specification, the ship is divided into a plurality of grid units;

[0022] (b) After the historical liquefied natural gas leakage state parameters and historical environmental data are set, it is judged whether the liquefied natural gas is ignited; if the liquefied natural gas is not ignited, the concentration distribution change after the liquefied natural gas is leaked is simulated, and the concentration distribution of the liquefied natural gas at different times and different positions is calculated; according to the explosion limit of the natural gas and the tolerance of personnel to the natural gas, the liquefied natural gas concentration in each grid unit is analyzed to obtain the dangerous area and the safe area under the leakage diffusion state, form a leakage diffusion consequence database, and give a safe personnel evacuation route under the leakage diffusion;

[0023] (c) if the liquefied natural gas is ignited, simulating different fire explosion models according to historical liquefied natural gas leakage state parameters, historical environmental data and ignition state; simulating the spreading process of fire, flame temperature, radiant heat flux and overpressure situation of explosion to obtain the damage degree of the ship structure, equipment on the ship and personnel, obtaining the dangerous area and safe area under the burning explosion state, forming a burning explosion consequence database, and giving a safe personnel evacuation route under the burning explosion.

[0024] The concentration distribution change of the liquefied natural gas after leakage is calculated by the following formula:

[0025]

[0026] In the formula, is the mass concentration of the leaked substance at the coordinate (x, y, x, z) point at t time; Q is the leakage rate (kg / s); respectively, the diffusion coefficient (m) on the x, y, z axis; x, y, z are the coordinate values (m) on the x, y, z axis; u represents the average wind speed (m / s); t represents the diffusion time (s); H represents the height (m) of the leakage source.

[0027] The lower limit of the explosion limit of the natural gas is 35800 , the upper limit is 107500 , and the tolerance limit of the personnel to the natural gas is 6700 . With 6700 , 35800 , 107500 Three concentration values as the boundary line to divide the dangerous area. The area surrounded by the two concentration lines of 35800 and 107500 may cause burning explosion accidents, and the area should avoid fire sources; the area outside the concentration line of 6700 is a harmful area to the human body, and the staff should avoid entering the area.

[0028] The damage degree of the heat radiation flux to the ship structure, equipment on the ship and personnel is shown in Table 1.

[0029] Table 1

[0030] The heat radiation flux is selected as 1.6 The following is a safe area, and personnel should avoid entering the area exceeding the value.

[0031] The damage degree of the overpressure situation of explosion to the ship structure, equipment on the ship and personnel is shown in Table 2.

[0032] Table 2

[0033]

[0034] The overpressure below 0.030 MPa is selected as a safe area, and personnel should avoid entering the area exceeding the value.

[0035] Preferably, the ignition state of step (c) comprises ignition and non-ignition, wherein ignition comprises direct ignition and delayed ignition.

[0036] The direct ignition of the present application refers to the immediate presence or contact of an ignition source (such as an open flame, an electric spark, a high-temperature surface, etc.) while the liquefied natural gas is leaking, resulting in rapid combustion or explosion of the leaked gas. Delayed ignition refers to the situation that after the liquefied natural gas leaks, no ignition source is encountered within a certain period of time, but combustion or explosion occurs subsequently due to some reason (such as the leaked gas diffusing to other areas and contacting an ignition source). In the ship environment, direct ignition may occur when equipment failure leads to simultaneous leakage and spark generation, while delayed ignition may be triggered when the leaked gas is blown by the wind to other areas and contacts an ignition source.

[0037] The schematic diagram of different fire and explosion consequences caused by liquefied natural gas leakage is shown in Figure 1 According to the continuous or instantaneous leakage of liquefied natural gas and the immediate or delayed ignition, different situations such as jet fire, vapor cloud explosion, no fire, boiling liquid expanding vapor explosion and pool fire may be formed.

[0038] Preferably, the fire and explosion model of step (c) comprises a pool fire model, a vapor cloud explosion model, a boiling liquid expanding vapor explosion model and a jet fire model.

[0039] The pool fire model of the present application is suitable for the situation that the liquefied natural gas forms a liquid pool on the ground after leakage and burns, and can accurately simulate the heat radiation intensity; the vapor cloud explosion model is mainly used to simulate the explosion of the combustible gas cloud formed after the leakage of liquefied natural gas when encountering an ignition source, and can calculate the damage of explosion overpressure to the ship structure and personnel; the boiling liquid expanding vapor explosion model is aimed at the situation that a large amount of liquefied natural gas leaks and rapidly vaporizes, and can simulate the strong explosion and fireball spreading process caused thereby; the jet fire model is suitable for the scene that liquefied natural gas leaks from high-pressure equipment or pipelines and forms a jet flame, and can evaluate the heat radiation hazard of the jet fire to the surrounding environment.

[0040] The calculation formula involved in each fire and explosion model of the present application is as follows:

[0041] The calculation formula of the heat radiation intensity of the flame surface of the pool fire model is:

[0042]

[0043] where I is the flame surface thermal radiation intensity, D is the diameter of the liquid pool, m; is the liquid mass burning rate, f is the thermal radiation coefficient, taken as 0.15; is the LNG combustion heat, generally taken as L is the flame height, m.

[0044] The formula for calculating the overpressure value of the vapor cloud explosion model is:

[0045]

[0046] where is the overpressure value generated by the vapor cloud explosion (kPa), is the TNT equivalent value (kg), and x is the distance from the explosion center of the vapor cloud to the pressure measurement point, m. where

[0047] It is calculated by the following formula:

[0048]

[0049] where is the ground explosion coefficient (empirical value taken as 1.8), is the free vapor cloud equivalent coefficient, M is the total mass of the diffusion vapor cloud (kg), which is also the total mass of the fuel; is the combustion heat (J / kg); is the heat value generated by a unit of TNT explosion (J / kg).

[0050] The formula for calculating the thermal radiation intensity of the fireball surface of the boiling liquid expansion vapor explosion model is:

[0051]

[0052] where I is the thermal radiation intensity of the fireball, SEP is the thermal radiation rate of the fireball surface (J / cm2); is the visual coefficient; is the atmospheric heat transfer coefficient. where SEP is calculated by the following formula:

[0053]

[0054]

[0055] where is the effective combustion heat of the fireball (J / kg); is the fireball surface thermal radiation energy ratio;​​ is the mass of the combustible participating in the explosion (kg) ; is the radius of the fireball (m) ; is the duration of the fireball (s).

[0056] The calculation is made by the following formula:

[0057]

[0058] In the formula, is the lift height of the fireball (m) ; x is the distance between the center of the fireball and the ground projection of the target, m.

[0059] The calculation is made by the following formula:

[0060]

[0061] In the formula, is the water vapor pressure in the air at ambient temperature (kPa) ; X is the distance from the surface of the fireball, m.

[0062] The formula for calculating the thermal radiation intensity of the flame surface of the jet fire model is:

[0063]

[0064] In the formula, I is the thermal radiation intensity, is the radiation efficiency factor, generally taken as 0.35; is the combustion heat of LNG, generally taken as ; Q is the leakage rate, kg / s; is the atmospheric transmission coefficient, taken as 1; r is the distance from the leakage point, m.

[0065] Preferably, when the ship structure, the layout of equipment on the ship or the location and specification of the liquefied natural gas storage tank change, the leakage consequence database in step (2) is updated, so that the leakage consequence database can always accurately reflect the leakage consequences under the current state of the ship and provide reliable decision support for personnel evacuation guidance.

[0066] Preferably, the safe personnel evacuation route in step (3) is displayed by electronic evacuation indication signs in the safe area derived from the leakage consequence situation.

[0067] As a preferred technical solution of the present application, the ship liquefied natural gas leakage analysis and personnel evacuation guidance method comprises the following steps:

[0068] ​(1) monitoring whether there is liquefied natural gas leakage on the ship, if there is leakage, collecting the leakage state parameters of liquefied natural gas and the current environmental data of the sea area where the ship is located; the leakage state parameters of liquefied natural gas include the leakage form, the leakage aperture size, the leakage position, the initial pressure and the leakage speed of liquefied natural gas; the leakage form includes continuous leakage and instantaneous leakage; the environmental data is collected by a ship weather instrument; the environmental data includes wind speed, wind direction, temperature, air pressure and atmospheric stability;

[0069] (2) according to the leakage state parameters and the environmental data, matching the corresponding leakage consequence situation from the leakage consequence database, and giving the safe personnel evacuation route according to the leakage consequence situation; the leakage consequence database includes a leakage diffusion consequence database and a combustion and explosion consequence database; if there is no liquefied natural gas combustion and explosion, the corresponding leakage consequence situation is matched in the leakage diffusion consequence database; if there is liquefied natural gas combustion and explosion, the corresponding leakage consequence situation is matched in the combustion and explosion consequence database;

[0070] The leakage consequence database is obtained by the following simulation steps:

[0071] (a) after constructing a three-dimensional model of the ship according to the ship size, shape, cabin layout, liquefied natural gas tank position and liquefied natural gas tank specification, the ship is divided into a plurality of grid units;

[0072] (b) after setting the historical liquefied natural gas leakage state parameters and historical environmental data, it is judged whether the liquefied natural gas is ignited; if the liquefied natural gas is not ignited, the concentration distribution change after the liquefied natural gas leakage is simulated, and the concentration distribution of liquefied natural gas at different times and different positions is calculated; according to the explosion limit of natural gas and the tolerance of personnel to natural gas, the liquefied natural gas concentration in each grid unit is analyzed, the dangerous area and the safe area under the leakage diffusion state are obtained, the leakage diffusion consequence database is formed, and the safe personnel evacuation route under the leakage diffusion is given;

[0073] (c) if the liquefied natural gas is ignited, different fire and explosion models are simulated according to the historical liquefied natural gas leakage state parameters, historical environmental data and ignition state; the spread process of fire, flame temperature, radiation heat flux and the damage degree of overpressure caused by explosion to the ship structure, equipment on the ship and personnel are simulated, the dangerous area and the safe area under the combustion and explosion state are obtained, the combustion and explosion consequence database is formed, and the safe personnel evacuation route under the combustion and explosion is given;

[0074] The ignition state includes ignition and non-ignition, wherein the ignition includes direct ignition and delayed ignition; the fire and explosion model includes pool fire model, vapor cloud explosion model, boiling liquid expanding vapor explosion model and jet fire model;

[0075] updating the leakage consequence database when the ship structure, the equipment layout on the ship, or the liquefied natural gas tank position and liquefied natural gas tank specification changes;

[0076] (3) guiding the personnel in the ship to evacuate according to the safe personnel evacuation route displayed by the electronic evacuation indication sign at the safety area derived from the leakage consequence condition.

[0077] In a second aspect, the present application further provides a ship liquefied natural gas leakage analysis and personnel evacuation guiding device system, which performs the ship liquefied natural gas leakage analysis and personnel evacuation guiding method of the first aspect.

[0078] The ship liquefied natural gas leakage analysis and personnel evacuation guiding device system comprises a leakage state monitoring module, an environmental data acquisition module, a leakage consequence matching module, and a personnel evacuation guiding module.

[0079] The leakage state monitoring module and the environmental data acquisition module are both connected with the leakage consequence matching module; the leakage consequence matching module and the personnel evacuation guiding module are sequentially connected.

[0080] The leakage state monitoring module in the ship liquefied natural gas leakage analysis and personnel evacuation guiding device system of the present application is used for monitoring whether the liquefied natural gas leakage occurs on the ship, and collecting the leakage state parameters of the liquefied natural gas if the leakage occurs; the environmental data acquisition module is used for collecting the current environmental data of the sea area where the ship is located; the leakage consequence matching module matches the corresponding leakage consequence from the leakage consequence database according to the leakage state parameters of the liquefied natural gas collected by the leakage state monitoring module and the environmental data collected by the environmental data acquisition module, and gives the safe personnel evacuation route; the personnel evacuation guiding module guides the personnel in the ship to evacuate according to the safe personnel evacuation route. The present application monitors and analyzes the liquefied natural gas leakage condition of the ship, matches the appropriate leakage diffusion consequence database or combustion explosion consequence database in combination with the environmental data and whether the liquefied natural gas has combustion explosion, derives the safe personnel evacuation guiding route, and greatly reduces the personnel casualties and property losses caused by the liquefied natural gas leakage accident of the ship.

[0081] Preferably, the leakage state monitoring module comprises an open-circuit laser gas detector.

[0082] Preferably, the personnel evacuation guiding module comprises an emergency broadcasting device, an audible and visual alarm device and an electronic evacuation indication sign, wherein the emergency broadcasting device is used to inform the crew and passengers of the accident location and the degree of danger, and to issue clear evacuation instructions; the audible and visual alarm device flashes light and emits alarm sound to remind personnel to evacuate; and the electronic evacuation indication sign dynamically adjusts the indication direction according to the current accident situation and evacuation route, so as to ensure that personnel can quickly and accurately find the safe exit.

[0083] Preferably, the personnel evacuation guiding module is connected with a ship communication device system, and can send accident information and a distress signal to a shore-based management department, so as to obtain external support and guidance, thereby comprehensively improving the efficiency and safety of personnel evacuation.

[0084] Compared with the prior art, the present application has at least the following beneficial effects:

[0085] The ship liquefied natural gas leakage analysis and personnel evacuation guiding device and method provided by the present application transmit the leakage state parameters of liquefied natural gas and the current environmental data of the sea area where the ship is located to a leakage consequence database constructed according to historical leakage state parameters of liquefied natural gas and historical environmental data for matching, to obtain corresponding leakage consequences, and then accurately judge the degree of danger and the range of the leakage accident; a safe and accurate evacuation route is given based on the degree of danger and the range of the leakage accident, to guide the personnel on the ship to quickly and orderly evacuate the dangerous area, thereby greatly improving the overall safety of the ship in the event of a liquefied natural gas leakage accident. BRIEF DESCRIPTION OF DRAWINGS

[0086] Figure 1 is a schematic diagram of different fire and explosion consequences caused by liquefied natural gas leakage.

[0087] Figure 2 is a flowchart of the ship liquefied natural gas leakage analysis and personnel evacuation guiding method in the specific embodiment of the present application.

[0088] Figure 3 is a flowchart of the formation of the leakage consequence database in the specific embodiment of the present application.

[0089] Figure 4 is a module connection diagram of the ship liquefied natural gas leakage analysis and personnel evacuation guiding device system in the specific embodiment of the present application. DETAILED DESCRIPTION

[0090] The technical solutions of the present application will be further described below in combination with the drawings and through specific embodiments.

[0091] The present application will be further described below. However, the following examples are only simple examples of the present application, and do not represent or limit the protection scope of the present application, and the protection scope of the present application is subject to the claims.

[0092] As a specific embodiment of the present application, a ship liquefied natural gas leakage analysis and personnel evacuation guidance method is provided, a flowchart of which is shown in Figure 2 .

[0093] The ship liquefied natural gas leakage analysis and personnel evacuation guidance method comprises the following steps:

[0094] (1) monitoring whether there is liquefied natural gas leakage on the ship, if there is leakage, collecting the leakage state parameters of liquefied natural gas and the current environmental data of the sea area where the ship is located;

[0095] The leakage state parameters of liquefied natural gas include the leakage form, the leakage aperture size, the leakage position, the initial pressure and the leakage speed of liquefied natural gas; the leakage form includes continuous leakage and instantaneous leakage; the environmental data is collected by a ship weather instrument; the environmental data includes wind speed, wind direction, temperature, air pressure and atmospheric stability;

[0096] (2) according to the leakage state parameters and the environmental data, matching the corresponding leakage consequence situation from the leakage consequence database, and giving a safe personnel evacuation route according to the leakage consequence situation;

[0097] The leakage consequence database includes a leakage diffusion consequence database and a combustion and explosion consequence database; if there is no liquefied natural gas combustion and explosion, matching the corresponding leakage consequence situation in the leakage diffusion consequence database; if there is liquefied natural gas combustion and explosion, matching the corresponding leakage consequence situation in the combustion and explosion consequence database;

[0098] The leakage consequence database is obtained by the following simulation steps, a flowchart of which is shown in Figure 3 .

[0099] (a) after constructing a three-dimensional model of the ship according to the ship size, shape, cabin layout, liquefied natural gas tank position and liquefied natural gas tank specifications, the ship is divided into a plurality of grid units;

[0100] (b) after setting the historical liquefied natural gas leakage state parameters and historical environmental data, judging whether the liquefied natural gas is ignited; if the liquefied natural gas is not ignited, simulating the concentration distribution change after the liquefied natural gas leakage, calculating the concentration distribution of liquefied natural gas at different times and different positions; according to the explosion limit of natural gas and the tolerance ability of personnel to natural gas, analyzing the liquefied natural gas concentration in each grid unit, obtaining the dangerous area and the safe area under the leakage diffusion state, forming the leakage diffusion consequence database, and giving a safe personnel evacuation route under the leakage diffusion;

[0101] (c) if the liquefied natural gas is ignited, simulating different fire explosion models according to the historical liquefied natural gas leakage state parameters, historical environmental data and ignition state; simulating the spreading process of fire, flame temperature, radiant heat flux and overpressure situation caused by explosion to the damage degree of ship structure, equipment on the ship and personnel, obtaining the dangerous area and safe area under the burning explosion state, forming the burning explosion consequence database, and giving the safe personnel evacuation route under the burning explosion;

[0102] The ignition state includes ignition and non-ignition, wherein the ignition includes direct ignition and delayed ignition; the fire explosion model includes pool fire model, vapor cloud explosion model, boiling liquid expanding vapor explosion model and jet fire model;

[0103] When the ship structure, equipment layout on the ship or liquefied natural gas tank position and liquefied natural gas tank specification change, the leakage consequence database is updated;

[0104] (3) guiding the personnel in the ship to evacuate according to the safe personnel evacuation route displayed by the electronic evacuation indication sign in the safe area obtained from the leakage consequence situation.

[0105] As one specific embodiment of the present application, a ship liquefied natural gas leakage analysis and personnel evacuation guiding device system is also provided, and a module connection schematic diagram thereof is shown in Figure 4 .

[0106] The ship liquefied natural gas leakage analysis and personnel evacuation guiding device system carries out the above-mentioned ship liquefied natural gas leakage analysis and personnel evacuation guiding method;

[0107] The ship liquefied natural gas leakage analysis and personnel evacuation guiding device system comprises a leakage state monitoring module, an environmental data acquisition module, a leakage consequence matching module and a personnel evacuation guiding module; the leakage state monitoring module and the environmental data acquisition module are connected with the leakage consequence matching module; the leakage consequence matching module and the personnel evacuation guiding module are connected in sequence.

[0108] The leakage state monitoring module is an open-circuit laser gas detector.

[0109] The personnel evacuation guiding module comprises an emergency broadcasting device, an audible and visual alarm device and an electronic evacuation indication sign.

[0110] The personnel evacuation guiding module is connected with a ship communication device system (not shown in the figure).

[0111] In summary, the ship liquefied natural gas leakage analysis and personnel evacuation guiding method provided by the present application can judge whether liquefied natural gas leakage occurs on the ship by monitoring, if leakage occurs, collect the leakage state parameters of the liquefied natural gas and the current environmental data of the sea area where the ship is located, and according to whether the liquefied natural gas combustion and explosion occurs, match the leakage diffusion consequence database or the combustion and explosion consequence database, according to the leakage consequence given by the database, obtain the safe personnel evacuation route, quickly guide the personnel in the ship to evacuate in time, improve the safety of the ship when the liquefied natural gas leaks, and is suitable for wide range of popularization and application.

[0112] The applicant declares that the above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and those skilled in the art should understand that any changes or replacements within the technical scope disclosed by the present application can be easily thought of by any person skilled in the art in the technical field, and all fall within the protection scope and disclosure scope of the present application.

Claims

1. A method of ship LNG leakage analysis and personnel evacuation guidance, characterized in that, The ship liquefied natural gas leakage analysis and personnel evacuation guiding method comprises the following steps: (1) monitoring whether liquefied natural gas leakage occurs on the ship, if leakage occurs, collecting the leakage state parameters of liquefied natural gas and the current environmental data of the sea area where the ship is located; (2) according to the leakage state parameters and the environmental data, matching the corresponding leakage consequence situation from the leakage consequence database, and giving the safe personnel evacuation route according to the leakage consequence situation; The leakage consequence database includes a leakage diffusion consequence database and a combustion and explosion consequence database; if no liquefied natural gas combustion and explosion occurs, the corresponding leakage consequence situation is matched in the leakage diffusion consequence database; if liquefied natural gas combustion and explosion occurs, the corresponding leakage consequence situation is matched in the combustion and explosion consequence database; (3) guiding the personnel on the ship to evacuate according to the safe personnel evacuation route.

2. The method of claim 1, wherein, The leakage state parameters of liquefied natural gas in step (1) include the leakage form, leakage aperture size, leakage position, initial pressure and leakage speed of liquefied natural gas. The leakage form includes continuous leakage and instantaneous leakage.

3. The method of claim 1, wherein, The environmental data in step (1) is collected by a ship weather instrument. The environmental data includes wind speed, wind direction, temperature, air pressure and atmospheric stability.

4. The method of claim 1, wherein, The leakage consequence database in step (2) is obtained by the following simulation steps: (a) after constructing a three-dimensional model of the ship according to the ship size, shape, cabin layout, liquefied natural gas tank position and liquefied natural gas tank specifications, the ship is divided into a plurality of grid units; (b) after setting the historical liquefied natural gas leakage state parameters and historical environmental data, it is judged whether the liquefied natural gas is ignited; if the liquefied natural gas is not ignited, the concentration distribution change after the liquefied natural gas leakage is simulated, and the concentration distribution of liquefied natural gas at different times and different positions is calculated; according to the explosion limit of natural gas and the tolerance of personnel to natural gas, the liquefied natural gas concentration in each grid unit is analyzed, the dangerous area and the safe area under the leakage diffusion state are obtained, the leakage diffusion consequence database is formed, and the safe personnel evacuation route under the leakage diffusion is given; (c) if the liquefied natural gas is ignited, different fire and explosion models are simulated according to the historical liquefied natural gas leakage state parameters, historical environmental data and ignition state; the spread process of fire, flame temperature, radiation heat flux and the damage degree of explosion produced super pressure to the ship structure, equipment on the ship and personnel are simulated, the dangerous area and the safe area under the combustion and explosion state are obtained, the combustion and explosion consequence database is formed, and the safe personnel evacuation route under the combustion and explosion is given.

5. The method of claim 4, wherein, The ignition state in step (c) includes ignition and non-ignition, wherein ignition includes direct ignition and delayed ignition.

6. The method of claim 4, wherein, The fire and explosion model in step (c) includes pool fire model, vapor cloud explosion model, boiling liquid expanding vapor explosion model and jet fire model.

7. The method of claim 1, wherein, When the ship structure, equipment layout on the ship or liquefied natural gas tank position and liquefied natural gas tank specifications change, the leakage consequence database in step (2) is updated.

8. The method of claim 1, wherein, The safe personnel evacuation route in step (3) is displayed by the electronic evacuation indication sign in the safe area derived from the leakage consequence situation.

9. A marine LNG spill analysis and personnel evacuation guidance device system, characterized in that, The ship liquefied natural gas leakage analysis and personnel evacuation guiding device system carries out the ship liquefied natural gas leakage analysis and personnel evacuation guiding method in any one of claims 1-8; The ship liquefied natural gas leakage analysis and personnel evacuation guiding device system comprises a leakage state monitoring module, an environmental data acquisition module, a leakage consequence matching module and a personnel evacuation guiding module. The leakage state monitoring module and the environmental data acquisition module are connected with the leakage consequence matching module; the leakage consequence matching module and the personnel evacuation guiding module are connected in sequence.

10. The marine LNG leak analysis and personnel evacuation guidance apparatus system of claim 9, wherein, The leakage state monitoring module comprises an open circuit type laser gas detector; The personnel evacuation guiding module comprises an emergency broadcasting device, an audible and visual alarm device and an electronic evacuation indication sign; The personnel evacuation guiding module is connected with a ship communication device system.

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