JP4382698B2 - Fuel tank fire / extinguishing situation simulation system - Google Patents

Description

  The present invention relates to a fire / extinguishing situation simulation system, and more specifically, to a fire / extinguishing situation simulation system suitable for large-scale fires such as tank fires where assumptions and training of actual fire situations are difficult. It is.

  Due to the long-period vibration accompanying the Tokachi-oki earthquake that occurred in September 2003, the floating roof tank (FRT: Floating Roof Tank) of Idemitsu Kosan Co., Ltd. subsided due to sloshing. The fire was a full-scale fire in a large tank. In the case of the floating roof type tank, the ring fire can be extinguished on the assumption that the ring-shaped seal portion between the floating roof and the tank inner wall stays in the burning fire without developing into the entire tank fire. About fixed fire extinguishing equipment is provided. In the disaster prevention law such as the oil complex, the owner of a large tank has a self-defense disaster prevention organization that conducts firefighting activities using a set of three large water discharge trucks, large chemical fire trucks, and foam fire extinguishing liquid concentrate transportation vehicles. Although it is obliged to install, in the case of a floating roof type tank, only one set is required. However, the large-scale tank fires described above have no experience in the past and could not be extinguished by the fire fighting system stipulated by domestic laws and regulations.

  Large-scale fires in floating roof tanks associated with long-period vibrations have become a situation that cannot be overlooked as a possible danger, but such large-scale fires are rare even in the world and have a proven track record of extinguishing fires. Because there are few, what kind of situation will happen when a fire actually occurs and how to extinguish it are unknown areas even for professional firefighters. In addition, large-scale fire experiments are extremely difficult to realize because they have a great influence on the surroundings. The full fire of the floating roof tank became a problem in the Diet after the Tokachi-oki earthquake, and a law revision passed the Diet in around June 2004. Along with this, the introduction of fire extinguishing equipment and fire extinguishing methods using large-capacity bubble guns that are considered to be more effective for extinguishing large-scale fires is expected.

By the way, as a method for extinguishing a tank fire proposed outside the country, there is a method shown in Patent Document 1 below. According to the art, a foam extinguisher surface is established, after which the inner and / or outer tank wall is cooled and the residual flame is sprayed with dry powder.
Special table 2001-500377 gazette

  However, the technique described in Patent Document 1 described above cannot solve the question of what kind of phenomenon will occur if a fire actually occurs and what kind of fire drill should be performed. The actual fire is thought to be greatly affected by many factors, including the type of fuel, the size and location of the tank, the fire extinguishing equipment used, the weather, and the presence of surrounding structures. This is because the optimum fire extinguishing conditions are different. As mentioned above, in practice, large-scale fire drills and experiments are extremely difficult. Therefore, if the fire situation / extinguishing situation assumed for each tank or refinery can be examined in advance by simulation and further confirmed visually, the arrangement and preparation of fire extinguishing equipment and storage of extinguishing agent It is very convenient to make measures in various areas such as quantity or fire fighting training.

  At present, simulation programs converted to CG are not limited to fires and are not widely used. Until now, CG is mostly games. However, the game is advanced based on a scenario created in advance, and factors that are not prepared cannot be input artificially. Reasons why there are no existing simulation programs such as fires are as follows: (1) Large-scale fires in Japan are the first time when the Tokachi-oki earthquake has occurred, and the discussion has not been finalized. (2) Development of simulation programs For this purpose, computer technology such as CG and programming is not sufficient, but knowledge in various fields such as fluid dynamics, chemical engineering, and safety engineering is required. (3) Data on the process of fire extinguishing with foam is very recently obtained. (4) It is considered necessary to have knowledge of fire-fighting equipment that actually extinguishes fires.

The present invention focuses on the above points, and its purpose is to numerically calculate fire / extinguishing phenomena while considering various factors for the occurrence of fire phenomena, and visually confirm phenomena that are impossible in experiments. Is to provide a simulation system of the fire / extinguishing situation of the fuel tank that can be

In order to achieve the above-mentioned object, the present invention displays a data input screen on a display device, and allows an operator to input data using the input device for inputting data. Data acquisition means for acquiring data for numerically calculating a fire extinguishing phenomenon, situation analysis means for numerically calculating a fire / extinguishing phenomenon of fuel in a fuel tank based on the data acquired by the data acquisition means, and the situation analysis means Display processing means for visually displaying the fire / extinguishing status on a display device based on the result obtained by the above-mentioned, the status analysis means, the bubble emissivity and the large capacity acquired by the data acquisition means Calculation of pressure loss and supply pressure of large-diameter hose in the fire extinguishing equipment based on the rated flow rate of the bubble cannon, and fire extinguishing foam fuel gauge Performs, wind speed acquired by the data acquisition means, the wind direction, the type of extinguishing foam, based on the expansion ratio, the step performs a calculation of the radiation flight distance of fire fighting foam a, a fuel tank obtained by the data acquisition means The flame size is calculated based on the physical properties of the fuel stored in the tank, or when the expansion area of the extinguishing foam is calculated in step e, the flame size is recalculated based on the expansion area. Step b, Step c for calculating the updraft and sweet spot due to fire based on the flame size calculated in Step b, Based on the physical properties of the fuel acquired by the data acquisition means, the type of fire extinguishing foam, and the expansion ratio Step d for calculating the landing time of the fire extinguishing foam, the physical properties of the fuel obtained by the data obtaining means, the type of fire extinguishing foam, A step e for calculating the expansion area of the fire extinguishing foam based on the magnification, and the steps b to e are repeated after the step e, and the display processing means At least one of them is displayed.

According to one of the main forms, the situation analysis unit calculates the fuel level in the tank based on the flame size calculated in the step b and the physical property of the fuel acquired by the data acquisition unit. Based on the flame size calculated in step p, step b, and the radiation heat calculation data acquired by the data acquisition means, step q for calculating radiant heat, based on the calculation result of radiant heat in step q, or the calculation of the temperature rise of the surrounding structures, or, when the cooling water spray amount for cooling the surrounding structures was calculated in step s, based on the cooling dispersion water, the temperature rise of the surrounding structures Step r for recalculation, and calculation of the cooling water spray amount for cooling the surrounding structure based on the calculation result of the temperature rise of the surrounding structure by the step r Performing step s, with including, and performs repeatedly the steps r~s after said step s.

According to yet another aspect, the display processing means displays the fire / extinguishing status over time . The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

The present invention numerically calculates fire / extinguishing phenomena while taking into consideration various factors related to fire phenomena, and visually displays the fire / extinguishing status based on the calculation results, including phenomena that are impossible to experiment. The effect of being able to easily check the fire / extinguishing situation can be obtained. In addition, the simulation results can be effectively utilized by referring to the simulation results for preparation of fire extinguishing equipment and the like and for fire fighting training.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. The fire / extinguishing situation simulation system of the present embodiment uses the system of the present invention for simulation of a fire / extinguishing situation of a large tank (for example, a floating roof tank). In the following description, it is assumed that a European system comprising a large-capacity foam cannon, a fluoroprotein foam, a large-diameter hose, and a mobile fire pump is applied to extinguish the tank fire. FIG. 1 is a block diagram showing a system configuration of the present embodiment, and FIG. 2 is a diagram showing a positional relationship between a tank and a nozzle (foam radiation gun). 3 to 5 are diagrams showing examples of simulation input data, and FIGS. 6 and 7 are display examples of simulation results. FIG. 8 is a flowchart showing an example of a calculation subroutine at the time of simulation.

  As shown in FIG. 1, a fire / fire extinguishing situation simulation system 10 includes a display device 14, an input device 16, a program memory 18, and a data memory 30 connected to an arithmetic processing device 12, and uses a general computer. Can be configured. Further, an output device 17 such as a printer is also connected as necessary. The arithmetic processing unit 12 includes a CPU, a RAM, and a ROM. The display device 14 is a display using a liquid crystal panel, for example, and displays a simulation result 50 and the like. The input device 16 includes a keyboard and a mouse, and is used for inputting simulation data 40 and the like. The output device 17 prints the simulation result and the examination contents based on the result as necessary. Note that the output of the simulation result or the like is not limited to printing or the like, and may be recorded on a general recording medium. The program memory 18 and the data memory 30 are constituted by a hard disk, for example.

The program memory 18 stores a tank fire simulation program 20, and the tank fire simulation program 20 includes a data acquisition program 22A, a situation analysis program 22B, a fire / fire extinguishing situation display processing program 22C, and the like. ing. The data acquisition program 22 </ b> A displays a screen for the operator to input the simulation data 40 using the input device 16, and stores the acquired data in the data memory 30. Status analysis program 22B based on the data acquired by the data acquisition program 22A, the fire-extinguishing phenomenon numerically calculated, and stores the calculation result in the data memory 30. The fire / extinguishing status display processing program 22C performs processing so that the display device 14 can display the fire / extinguishing status based on the result obtained by the numerical calculation .

  On the other hand, in the data memory 30, in addition to the acquisition data 32 acquired by the data acquisition program 22A, the analysis data 34 obtained by the analysis processing program 22B, display of image data and the like used when displaying the simulation result Data for use 36 is included. The acquired data 32 has the same contents as the simulation data 40.

3A to 3G show an example of simulation data 40. FIG. A screen for inputting the simulation data 40 is displayed on the display device 14 by the data acquisition program 22A. Further, the position / orientation used in the following simulation data 40 includes the positional relationship between the tank 60 and the nozzle 62 shown in FIG. As a specific input example, for example, as shown in FIGS.
(A) Tank center: Position X, Position Y, Height Z, Radius
(B) Weather: Air (outside air) temperature, humidity, wind speed, wind direction X, wind direction Z (X, Y, Z axes are based on Fig. 2)
(Wind direction X: 0 to 90 deg, 0 = wind from bottom to top on Y axis, 90 = wind from right to left on X axis)
(Wind direction Z: 0 to 90 deg, 0 = horizontal wind on the Z axis, 90 = wind from bottom to top on the Z axis)
(C) For expansion calculation: Oil density, oil viscosity, (water density, water viscosity), effective foam input loss (discharge amount x (1-loss))
(D) Nozzle: Nozzle diameter, nozzle pressure, discharge amount
(E) Foam characteristics: foaming ratio
(F) Simulation environment: Fluid diameter, continuous fluid length, radial knurling time, expansion knurling time, sweet spot radius ratio, sweet spot upper limit height, nozzle absolute position X, nozzle absolute position Y, nozzle absolute position Z, virtual tank diameter
(G) Loss at landing: Data on oil type, specific heat of oil, true calorific value, latent heat of vaporization, density, bubble landing radius R0, rate within landing range, thickness of stirring layer, initial temperature of stirring layer, K value and so on.

In addition, as shown in FIG.
(H) For radiant heat calculation: tank or rectangular area selection, oil properties, tank size, rectangular area size, atmosphere, heat receiving surface,
Is also input. Note that FIGS. 3 and 4 are examples, and when there is an overlap in input items, data input to either one may be automatically reflected to the other.

Furthermore, as shown in FIGS. 5 (A) and (B),
(I) Arrangement: number of tanks, oil barrier, surrounding road, fire hydrant, foam fire extinguishing equipment, cooling sprinkler equipment, sea or river, long-distance foam cannon, portable pump, large-diameter hose, portable foam stock solution holder, possible Portable foam concentrate pump (including items such as fire alarm equipment, foam concentrate reservoir, fire brigade if necessary),
(J) Radiation (radiation angle of bubble gun): Radiation azimuth, radiation angle, radiation position height (radiation azimuth: 0-90deg, 0 = on Y axis, 90 = on X axis)
(Radiation angle: 0-90deg, 0 = horizontal, 90 = directly above)
Etc. are entered. The arrangement data can be customized by inputting the actual arrangement according to the actual situation of individual tanks or refineries. Further, the radiation angle of the bubble gun (nozzle 62) can simulate whether or not the fire-extinguishing bubble enters the sweet spot by manipulating this input data. The sweet spot is an optimum place for introducing bubbles, and for example, a sweet spot is a place where the ascending air flow is 1 m or less. The sweet spot is also described in Patent Document 1 described above.

Next, in the situation analysis program 22B, the following various numerical calculations are performed.
(a) Hydropower calculation of water transport by large-diameter hose: When the seawater is taken from the sea with a pump and sent to the radiation gun (nozzle) through the hose, the pressure required by the pump is calculated. Perform calculations based on existing data.
(b) Calculation of sweet spot: Calculate the effective point to put in the fire extinguishing agent from the relationship with the upward air flow in the tank.

  (c) Simulation of foam extinguishing agent radiation trajectory (flight curve) and sweet spot determination: Water that reaches the nozzle is mixed with the foam extinguisher stock solution and discharged from the nozzle as foam. Calculate the trajectory of. The bubble radiation locus is calculated considering the liquid bubble as a pseudo specific shape, taking into account only the inertial resistance of gravity and air, and is corrected according to the actual data. At this time, the influence of the wind direction and the wind speed included in the acquired data 32 (simulation data 40) is also included as a calculation factor. This calculation confirms whether the foam extinguishing agent enters the burning tank 60. If not, for example, in FIG. 5 (B), the input value is changed to change the direction of the radiation gun (nozzle) and adjust to enter. Here, it is also determined whether or not to enter the sweet spot.

  (d) Calculation of real fire extinguishing time: (d-1) Calculation of foam development start time and (d-2) Calculation of foam development time (fire extinguishing time) are performed. Bubbles that have entered the tank 60 do not readily accumulate on the liquid level of the tank due to evaporation or the like, but how long will it begin to accumulate, that is, the time until the bubbles start to develop for actual fire extinguishing Calculate (foam expansion start time). When the landed foam begins to spread, the part covered with foam is extinguished. The change with time of the expansion of the bubbles is calculated to determine the bubble development time. The actual fire extinguishing time is the foam development start time + the time when the foam develops 100% (fire extinguishing time), that is, the time from when the foam starts to enter the tank until the fire extinguishes.

(e) Flame size calculation
(f) Calculation of oil level in tank
(g) Calculation of remaining amount of foam stock solution

  (f) Calculation of radiant heat: When the liquid surface begins to be covered with bubbles, the size of the flame changes, and the radiant heat to the surroundings changes accordingly. Since the radiant heat changes depending on the height from the ground and the distance from the fire, the radiant heat from the fire received at a certain position is calculated. The calculation of radiant heat is based on, for example, the IP and NFPA methods that are commonly used worldwide.

  (g) Cooling sprinkling amount of adjacent tank and temperature calculation after sprinkling: When the adjacent tank 64 of the tank 60 (see FIG. 2) receives the radiant heat, the temperature of the adjacent tank 64 rises and there is a risk of causing a disaster. Therefore, the temperature rise of the adjacent tank 64 is calculated. Further, when the temperature rise in the adjacent tank 64 reaches a dangerous level, it is necessary to cool it with water, so the amount of water spray at that time is calculated. Furthermore, the temperature of the adjacent tank 64 after watering is also calculated.

  Next, a specific example of a simulation result displayed on the display device 14 by the fire / fire extinguishing status display processing program 22C will be described. 6 (A) to 6 (C) are diagrams showing the flight trajectory of bubbles emitted from a large-capacity bubble gun (nozzle), and FIG. 6 (A) is a three-dimensional view indicated by the XYZ axes in FIG. It is a figure seen from the upper side of this and is shown by XY coordinates. FIG. 6 (B) shows the three dimensions from the side and is shown by YZ coordinates, and FIG. 6 (C) shows the three dimensions from the front and shown by XZ coordinates. ing. Such a graph is displayed when the data shown in FIG. 3 and FIG. 5 (B) are input, and the bubble radiation locus can be visually confirmed on the display device 14.

  7A and 7B show display examples of other simulation results displayed when the data shown in FIGS. 3 to 5 are input. In the example shown in FIG. 7A, spot determination, fire extinguishing time (seconds), bubble expansion start time (min), and actual fire extinguishing time (min) are shown. In the example shown in the figure, the spot judgment is “HIT”, but when this is “OUT”, the radiation direction, angle, height, etc. are changed on the input screen shown in FIG. Adjust the settings to enter the sweet spot. In addition, as above-mentioned, substantial fire extinguishing time is represented by the sum of bubble expansion start time and fire extinguishing time (time required from bubble expansion start to 100% expansion | deployment). In the case of FIG. 7 (A), the fire extinguishing time is 213 seconds + foam spreading start time 16.49 minutes (about 16 minutes 29 seconds) = the actual fire extinguishing time 20.04 minutes (about 20 minutes 02 seconds).

  FIG. 7 (B) is a graph of the fire extinguishing time shown in FIG. 7 (A). The horizontal axis is the time (minutes) after the bubble starts to enter the tank, and the vertical axis is the bubble. Development area (%). That is, the time from when bubbles start to enter the tank until they start to accumulate (bubble expansion area 0%) is 16.49 minutes, and the time from when bubbles start to accumulate until the liquid level is covered 100% (fire extinguishing time) is 213 seconds. Therefore, it shows that the time taken for substantial fire extinguishing is 20.04 minutes.

  The display examples shown in FIGS. 6 and 7 may all be displayed on the same screen, or may be displayed together with the data input form. For example, by setting the form for inputting simulation data shown in FIG. 5 (B) and the display and graphs of FIGS. 7 (A) and 7 (B) simultaneously on the same screen, setting of the radial direction of the nozzle 62 and the like. It is convenient because the effect can be confirmed while changing the value. In addition to the display contents described above, the display device 14 displays the heat receiving intensity at an arbitrary point around the tank 60, the temperature in the adjacent tank 64, and the like by the fire / extinguishing status display processing program 22C. Furthermore, the size of the flame size of the tank 60 and an image showing the temporal change in the temperature of the adjacent tank 64 are displayed as necessary.

  Next, the operation of this embodiment will be described with reference to FIG. FIG. 8 is a diagram showing a calculation subroutine of the tank fire simulation program 20. It is assumed that the tank fire simulation program 20 in the program memory 18 is executed during the simulation of the fire / extinguishing situation described below. When the start of simulation is instructed by a predetermined operation, an input screen for simulation data is displayed on the display device 14 by the data acquisition program 22A. The operator inputs the simulation data 40 using the input device 16 (step S10). Here, the input simulation data 40 is, for example, as shown in FIGS. The input simulation data 40 is stored as acquired data 32 in the data memory 30, and based on this, predetermined numerical calculation is performed by the situation analysis program 22B, and the result is stored in the data memory 30 as analysis data 34. Remembered. The fire / fire extinguishing status display processing program 22C displays the simulation result 50 on the display device 14 at an appropriate timing based on the analysis data 34 and the display data 36. Further, it is output by the output device 17 as necessary.

  When the simulation data 40 is input, the situation analysis program 22A first calculates the pressure loss and supply pressure of the large-diameter hose based on the foam emissivity and the rated flow rate of the large-capacity foam gun, The remaining amount is calculated (steps S12 and S14). At the same time, the radiation flight distance of the bubbles is calculated based on the wind speed, the wind direction, the type of bubbles, the expansion ratio, etc. (step S16). Thereafter, calculation of the flame size based on the physical properties of the oil (step S18), calculation of the updraft and sweet spot (step S20), calculation of the foam landing time based on the physical properties of the oil, the type of foam and the expansion ratio (step S22) I do. When the bubble landing time is calculated, the bubble development area is calculated (step S24). Since the flame size changes as the bubble development area changes, once the bubble development area is calculated, the calculation of the bubble development area from the calculation of the flame size (step S18) again (step S18) Steps S24) are repeated. These calculation results are displayed on the display device 14 in the form shown in FIGS. 6 and 7, for example.

  On the other hand, in parallel with the fire extinguishing situation from step S18 to S24, calculation of the oil level in the tank (step S26) and calculation of radiant heat (step S28) are performed. Based on the calculation result of the radiant heat, the temperature rise of the surrounding tank (adjacent tank 64) is calculated (step S30), and then the amount of water spray for cooling the surrounding tank is calculated (step S32). . Then, it returns to step S30 again and the temperature of the surrounding tank after watering is calculated. These calculation results are displayed on the display device 14 as the heat receiving intensity around the tank, the temperature in the surrounding tank, and the like, and the displayed numerical values are appropriately updated as the watering for cooling proceeds.

  During actual fire fighting activities, the fire is reported to the public fire department and the fire brigade is dispatched. In that case, the foam stock solution, long-distance foam cannon, portable pump, large-diameter hose, portable foam stock holder, portable foam stock solution pump, etc. are transported to the site within a certain time (for example, within 5 hours). When it comes to the site, for example, it prepares within 2 hours and starts the fire extinguishing work, and aims to extinguish the fire within a certain time (for example, 1 hour). By performing the simulation, the fire extinguishing time is calculated in consideration of a number of factors such as tank arrangement, fire extinguishing equipment, and weather, so that the fire extinguishing equipment for realizing the above-described fire extinguishing within a certain period of time is calculated. Can be used as a reference for preparation and training.

Thus, according to the first embodiment, there are the following effects.
(1) Considering factors related to natural phenomena such as wind speed and direction, fire and extinguishing phenomena are calculated numerically, and the fire and extinguishing status is displayed on the display device 14 based on the calculation results, so experiments are impossible It is possible to visually check the fire / extinguishing status, including simple cases.
(2) Since it is possible to input simulation data that matches the actual situation for each individual tank or refinery, it is possible to prepare optimum fire extinguishing equipment for each by referring to the simulation results.
(3) By displaying the change in the situation from the occurrence of a fire to the completion of the fire over time, it can be used as a reference for training.
(4) Considering the radiant heat of the fire, the temperature change of the adjacent tank 64 and the calculation of the amount of water spray for cooling are performed, so that a more realistic simulation can be performed.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The system configuration shown in the above embodiment is an example, and may be appropriately changed so as to achieve the same effect. Further, the fire / extinguishing situation simulation system 10 shown in the above embodiment may be connected to a network such as the Internet, and simulation data may be acquired from a refinery or the like via the network.
(2) The simulation data 40 and the displayed simulation result 50 shown in the above embodiment are examples, and may be appropriately changed as necessary. For example, a function of limiting the activities of firefighters may be provided by expressing in CG the difficulty of extinguishing fire due to radiant heat from the fire.
(3) The operation shown in the above embodiment is also an example, and may be appropriately changed so as to achieve the same effect. For example, the number of parameters used for the simulation is increased or the number of detailed subroutines is increased.
(4) If necessary, a more realistic simulation may be performed by using a video that is close to reality or by incorporating newly published experimental data.
(5) In the above embodiment, the simulation result according to the present invention is used for the preparation of fire extinguishing equipment and for training, but in the case of an insurance company, etc. It can be used as a risk assessment tool. In addition, in the case of refineries and the like, the risk can be reduced by purchasing necessary fire extinguishing equipment after examining the countermeasures by the simulation. It is also effective for appealing safety measures to neighboring residents.
(6) In the above embodiment, the European type fire extinguishing method has been described as an example. However, for example, it may be applied to an American system using an aqueous film foam stock solution and a non-aspirator type large-capacity foam gun. Good.
(7) In the above embodiment, tank fires and the like are suitable applications, but the present invention can also be applied to other fires such as high-rise buildings and large LNG terminals.

According to the present invention, the fire / extinguishing phenomenon is numerically calculated while considering various factors related to the fire phenomenon, and the fire / extinguishing situation is visually displayed based on the calculation result. It is suitable for the use of the simulation system. In particular, it is suitable for use in a simulation system related to a large-scale fire such as a tank fire that is difficult to experiment and train.

It is a block diagram which shows the system configuration | structure of Example 1 of this invention. It is a figure which shows the position of the tank and nozzle in the simulation of the said Example 1. FIG. It is a figure which shows an example of the input data for simulation of the said Example 1. FIG. It is a figure which shows an example of the input data for simulation of the said Example 1. FIG. It is a figure which shows an example of the input data for simulation of the said Example 1. FIG. It is a figure which shows the example of a display of the simulation result of the said Example 1. FIG. It is a figure which shows the example of a display of the simulation result of the said Example 1. FIG. It is a flowchart which shows an example of the calculation subroutine at the time of the simulation of the said Example 1. FIG.

Explanation of symbols

10: Fire / fire extinguishing situation simulation system 12: arithmetic processing unit 14: display unit 16: input unit 17: output unit 18: program memory 20: tank fire simulation program 22A: data acquisition program 22B: situation analysis program 22C: fire Fire extinguishing status display processing program 30: data memory 32: acquisition data 34: analysis data 36: display data 40: simulation data 50: simulation result 60: tank 62: nozzle 64: adjacent tank

Claims (3)

The data input screen is displayed on the display device, and the operator inputs data using the input device for inputting data, thereby obtaining data for numerical calculation of the fire / extinguishing phenomenon of fuel in the fuel tank. Data acquisition means,
A situation analysis means for numerically calculating a fire / extinguishing phenomenon of the fuel in the fuel tank based on the data obtained by the data obtaining means;
Display processing means for visually displaying a fire / extinguishing status on a display device based on the result obtained by the situation analysis means;
With
The situation analysis means includes
Based on the foam emissivity acquired by the data acquisition means and the rated flow rate of the large-capacity foam cannon, the pressure loss and supply pressure of the large-diameter hose in the fire extinguishing equipment, and the remaining amount of fire extinguishing foam are calculated, Calculating the radiation flight distance of the fire extinguishing foam based on the wind speed, the wind direction, the type of fire extinguishing foam, and the foaming magnification obtained by the data obtaining means a,
The flame size is calculated based on the physical properties of the fuel stored in the fuel tank acquired by the data acquisition means, or when the expansion area of the fire extinguishing foam is calculated in step e, the expansion area is Recalculating the flame size based on step b,
Step c for calculating the updraft and sweet spot due to the fire based on the flame size calculated in Step b,
Calculating the landing time of the foam for fire extinguishing based on the physical properties of the fuel obtained by the data obtaining means, the type of foam for fire extinguishing and the foaming ratio, d.
Calculating the expansion area of the fire extinguishing foam based on the physical properties of the fuel acquired by the data acquisition means, the type of foam for extinguishing and the expansion ratio, e.
And repeating the steps b to e after the step e,
The fuel tank fire / extinguishing situation simulation system, wherein the display processing means displays at least one of the calculation results of the situation analyzing means. The situation analysis means further includes:
Calculating the fuel surface height in the tank based on the flame size calculated in step b and the physical properties of the fuel acquired by the data acquisition means; p,
A step q of calculating radiant heat based on the flame size calculated in step b and the radiant heat calculation data acquired by the data acquisition means;
Based on the calculation result of the radiant heat in the step q, the temperature rise of the surrounding structure is calculated, or when the cooling water spray amount for cooling the surrounding structure is calculated in the step s, the cooling scattering is calculated. A step r for recalculating the temperature rise of the surrounding structure based on the amount of water;
Step s for calculating a cooling water spray amount for cooling the surrounding structure based on the calculation result of the temperature rise of the surrounding structure by the step r,
The fuel tank fire / extinguishing situation simulation system according to claim 1, wherein the steps r to s are repeatedly performed after the step s. It said display processing means, fire-extinguishing situation simulation system of a fuel tank according to claim 1 or 2, characterized in that over time displaying the fire extinguishing conditions.

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