Safety design device, safety design method, and ammonia-fueled ship

Abstract

A safety design method according to an embodiment comprises: executing an ammonia dispersion simulation on the basis of ventilation control information for an engine room in an ammonia-fueled ship; updating the ventilation control information so that a first area where the ammonia concentration is greater than or equal to a threshold is reduced on the basis of a hazard map generated through the dispersion simulation; repeating the execution of the dispersion simulation and the update of the ventilation control information until the first area satisfies a first condition; executing a disaster impact simulation for crew on the basis of the hazard map that satisfies the first condition, work information of the crew, and equipment arrangement information; updating the equipment arrangement information so that a second area where the risk of disaster impact on the crew is greater than or equal to a threshold is reduced on the basis of a disaster impact risk map generated through the disaster impact simulation; repeating the execution of the disaster impact simulation and the update of the equipment arrangement information until the second area satisfies a second condition; and outputting the ventilation control information and the equipment arrangement information that satisfy the second condition.

Description

Safety design device, safety design method, and ammonia-fueled ship

[0001] An embodiment of the present invention relates to a safety control device, a safety design method, and an ammonia-fueled ship.

[0002] As one of the efforts to reduce carbon dioxide emissions, ammonia-fueled ships that use ammonia as fuel are being considered.

[0003] Ammonia, whether in liquid or gas form, has a high potential for adverse effects on the human body. Therefore, ammonia-fueled ships are required to implement measures not only to prevent ammonia leakage, but also to take measures in the event of an ammonia leak.

[0004] Patent Document 1 discloses that, with regard to gas leakage, a diffusion simulation process is performed for each condition such as wind direction, and the arrangement of gas detection positions is presented.

[0005] Japanese Patent Application Publication No. 2012-247307

[0006] The engine room of an ammonia-fueled ship is an area with a relatively high risk of ammonia leaks, as it is home to ammonia-fueled equipment such as the main engine and generator. Meanwhile, crew members are constantly present in the engine room of an ammonia-fueled ship, working there. Therefore, it is desirable to design the engine room of an ammonia-fueled ship so that leaked ammonia does not easily spread to crew work areas.

[0007] An object of an embodiment of the present invention is to provide a technology for designing an engine room in an ammonia-fueled ship in such a way that leaked ammonia is less likely to spread to the crew's work area.

[0008] a first aspect of the safety design method according to the present embodiment is a safety design method comprising: performing an ammonia diffusion simulation based on ventilation control information in an engine room on an ammonia-fueled ship; updating the ventilation control information based on a hazard map generated by the diffusion simulation so as to reduce a first region where the ammonia concentration is equal to or greater than a threshold; repeating the steps of performing the diffusion simulation and updating the ventilation control information until the first region in the hazard map satisfies a first condition; performing a crew damage simulation based on the hazard map, crew work information, and equipment layout information in the engine room that satisfies the first condition; updating the equipment layout information based on a damage risk map generated by the damage simulation so as to reduce a second region where the crew damage risk is equal to or greater than a threshold; repeating the steps of performing the damage simulation and updating the equipment layout information until the second region in the damage risk map satisfies a second condition; and outputting the ventilation control information and the equipment layout information corresponding to the damage risk map that satisfies the second condition as design results.

[0009] In a second aspect of the embodiment, in the safety control method described in the first aspect, the ventilation control information includes at least one piece of information selected from the number of ducts in the engine room, the number, capacity, and type of fans, the intake and exhaust mechanism of the equipment, and the arrangement of bulkheads.

[0010] In a third aspect of the embodiment, in the safety control method described in the first aspect, updating the ventilation control information includes positioning the bulkhead to surround the upper part of the main engine.

[0011] In a fourth aspect of the embodiment, in the safety control method described in the first aspect, the equipment location information includes at least one piece of information selected from the location of a workshop in the engine room, the location of equipment that handles ammonia, and the location of equipment that does not handle ammonia.

[0012] In a fifth aspect of the embodiment, in the safety control method described in the first aspect, updating the equipment layout information includes arranging the location of a workshop or the location of equipment that does not handle ammonia at a level below the top of the main engine.

[0013] In a sixth aspect of the embodiment, in the safety control method described in the first aspect, updating the equipment layout information includes isolating equipment that handles ammonia from equipment that does not handle ammonia.

[0014] An ammonia-fueled ship of a seventh aspect according to the embodiment is an ammonia-fueled ship equipped with an engine room designed using the safety design method described in any one of the first to sixth aspects.

[0015] A safety design device according to an eighth aspect of the embodiment includes a diffusion simulator that performs a simulation of ammonia diffusion based on ventilation control information in an engine room on an ammonia-fueled ship; a ventilation control update unit that updates the ventilation control information based on a hazard map generated by the diffusion simulation so as to reduce a first region where the ammonia concentration is equal to or greater than a threshold; a first determination unit that repeats performing the diffusion simulation and updating the ventilation control information until the first region in the hazard map satisfies a first condition; and a first determination unit that determines whether the hazard map, crew work information, and machinery in the engine room satisfy the first condition. The safety design device includes a disaster simulator that executes a disaster simulation for the crew based on equipment layout information; an equipment layout update unit that updates the equipment layout information based on a disaster risk map generated by the disaster simulation so as to reduce a second area in which the crew's disaster risk is equal to or greater than a threshold; a second determination unit that repeats executing the disaster simulation and updating the equipment layout information until the second area in the disaster risk map satisfies a second condition; and an output unit that outputs the ventilation control information and the equipment layout information corresponding to the disaster risk map that satisfies the second condition as design results.

[0016] According to the embodiment, in an ammonia-fueled ship, it is possible to design an engine room in which leaked ammonia is less likely to spread to the crew's work area.

[0017] Fig. 1 is a block diagram showing an example of the overall configuration of a safety design system according to an embodiment. Fig. 2 is a block diagram showing an example of the hardware configuration of a safety design device according to an embodiment. Fig. 3 is a block diagram showing an example of the functional configuration of the safety design device according to an embodiment. Fig. 4 is a flowchart showing an example of safety design processing in the safety design device according to an embodiment. Fig. 5 is a diagram showing an example of an engine room of an ammonia-fueled ship designed by the safety design processing in the safety design device according to an embodiment.

[0018] The embodiments will be described with reference to the drawings. Note that the scale of each part in the drawings used in the following description of the embodiments may be changed as appropriate. Also, for the sake of explanation, the drawings used in the following description of the embodiments may omit components.

[0019] 1. Configuration 1.1 Overall Configuration FIG. 1 is a block diagram showing an example of the overall configuration of a safety design system according to an embodiment.

[0020] As shown in FIG. 1 , the safety design system 1 includes an ammonia-fueled ship 10 and a safety design device 20 .

[0021] The ammonia-fueled ship 10 is a ship that uses ammonia as fuel for propulsion. The ammonia-fueled ship 10 includes a main engine 11, a generator 12, and a plurality of devices 13.

[0022] The main engine 11 is a main engine for propelling the ammonia-fueled ship 10. The main engine 11 is configured to be switchable between being driven by ammonia and being driven by heavy oil.

[0023] The generator 12 is a power source for supplying electricity to the inside of the ammonia-fueled ship 10. The generator 12 is configured to be switchable between being driven by ammonia and being driven by heavy oil.

[0024] The main engine 11 and the generator 12 are integrated in the same compartment. Hereinafter, the compartment in which the main engine 11 and the generator 12 are integrated will be referred to as the "engine room ER."

[0025] The multiple pieces of equipment 13 are a group of equipment other than the main engine 11 and the generator 12 and arranged in the engine room ER. The multiple pieces of equipment 13 include ammonia fuel (AF) equipment that handles ammonia and non-AF equipment that does not handle ammonia. Examples of AF equipment include equipment that dilutes, neutralizes, and combusts oil and water mixed with ammonia, equipment such as tanks that store oil and water mixed with ammonia and air vent pipes for the tanks, and equipment such as pumps that transport oil and water mixed with ammonia. Examples of non-AF equipment include equipment that does not use ammonia as fuel, such as cooling seawater pumps and cooling freshwater pumps, and ordinary bilge pumps and sludge pumps that are not intended to process ammonia.

[0026] The plurality of pieces of equipment 13 arranged in the engine room ER are subject to work by crew members or are used for work by crew members, and therefore the engine room ER may be an area where there is a risk of ammonia leakage and where there is a relatively high risk of crew members being harmed by the leaked ammonia.

[0027] The safety design device 20 is, for example, an information processing device such as a computer or a server. The safety design device 20 has a function of designing the engine room ER of the ammonia-fueled ship 10. Specifically, the safety design device 20 designs the engine room ER so as to minimize the risk of the crew being harmed by ammonia. The design results of the engine room ER by the safety design device 20 are then applied to the ammonia-fueled ship 10.

[0028] 1.2 Safety Design Device FIG. 2 is a block diagram showing an example of the hardware configuration of a safety design device according to an embodiment.

[0029] As shown in FIG. 2 , the safety design device 20 includes a control circuit 21 , a storage 22 , a communication module 23 , a user interface 24 , a drive 25 , and a storage medium 26 .

[0030] The control circuit 21 is a circuit that controls the overall components of the safety design device 20. The control circuit 21 includes a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), etc. The CPU of the control circuit 21 controls the entire safety design device 20 in accordance with a program stored in the ROM of the control circuit 21. The RAM of the control circuit 21 has a working area for the CPU of the control circuit 21. The ROM of the control circuit 21 stores programs and the like used by the safety design device 20.

[0031] The storage 22 includes, for example, a hard disk drive (HDD) or a solid state drive (SSD). The storage 22 stores information used in various processes in the safety design device 20.

[0032] The communication module 23 is a circuit used for communication between the safety design device 20 and an external network.

[0033] The user interface 24 is a device that controls communication between the safety design device 20 and a user. The user interface 24 includes input devices and output devices. The input devices include, for example, a keyboard and a touch panel. The output devices include, for example, a printer, a speaker, a display, etc.

[0034] The drive 25 is a device for reading software stored in the storage medium 26. The drive 25 includes, for example, a CD (Compact Disk) drive or a DVD (Digital Versatile Disk) drive.

[0035] The storage medium 26 is a medium that stores software electrically, magnetically, optically, mechanically, or chemically. The storage medium 26 may store a program used by the safety design device 20.

[0036] FIG. 3 is a block diagram illustrating an example of a functional configuration of a safety design device according to an embodiment.

[0037] 3, the CPU of the control circuit 21 loads a program stored in the ROM of the control circuit 21 or the storage medium 26 into the RAM of the control circuit 21. The CPU of the control circuit 21 then interprets and executes the program loaded into the RAM of the control circuit 21. As a result, the safety design device 20 functions as a computer including a diffusion simulator 31, a first determination unit 32, a ventilation control update unit 33, a damage simulator 34, a second determination unit 35, an equipment layout update unit 36, and an output unit 37. The storage 22 also stores leakage case information 41, ventilation control information 42, a hazard map 43, work information 44, equipment layout information 45, a damage risk map 46, and a design result 47.

[0038] The diffusion simulator 31 is a functional block having a computational fluid dynamics (CFD) analysis function for a gas such as ammonia. The diffusion simulator 31 simulates how the leaked ammonia diffuses over time when the ammonia leaks in the engine room ER of the ammonia-fueled ship 10. The diffusion simulator 31 receives, for example, leakage case information 41 and ventilation control information 42 as input, executes a diffusion simulation process, and generates a hazard map 43. The diffusion simulator 31 sends the generated hazard map 43 to the first determination unit 32.

[0039] The leakage case information 41 is, for example, information that associates a set of time-series data of ammonia leakage location, leakage amount, leakage pressure, and leakage type with a failure mode in which an ammonia leakage may occur. The leakage case information 41 may further store the probability of occurrence of the failure mode. The leakage type is information that indicates whether the ammonia is liquid or gas.

[0040] The ventilation control information 42 is information relating to the intake and exhaust of the engine room ER formed by ventilation control. The ventilation control information 42 is generated taking into consideration the influence on the air flow of, for example, ducts and fans installed in the engine room ER, the intake and exhaust mechanisms of the equipment in the engine room ER, and bulkheads that physically separate the engine room ER.

[0041] The hazard map 43 is information showing the ammonia concentration distribution in the engine room ER in the event of an ammonia leak. The hazard map 43 may be time-series data of the ammonia concentration distribution in the engine room ER calculated by a diffusion simulation process. The hazard map 43 may also be a visualization of the maximum ammonia concentration for each failure mode at each position in the engine room ER.

[0042] The first determination unit 32 is a functional block that determines whether the hazard map 43 satisfies a first condition. Specifically, the first determination unit 32 determines, for example, based on the hazard map 43, whether the area where the concentration of ammonia leaking into the engine room ER is equal to or greater than a first threshold is within a second threshold, as the first condition. The first threshold may be, for example, an ammonia concentration at which the crew may suffer serious damage. If the area where the concentration of ammonia leaking into the engine room ER is equal to or greater than the first threshold (high concentration area) is not within the second threshold, the first determination unit 32 sends a determination result indicating that the hazard map 43 does not satisfy the first condition to the ventilation control update unit 33. The first determination unit 32 may present, together with the determination result, first auxiliary information for reducing the high concentration area to the ventilation control update unit 33. The first auxiliary information for reducing the high-concentration region may be, for example, information on the installation location of partitions to prevent ammonia diffusion, information on the arrangement positions of ducts and fans to efficiently exhaust ammonia, and information on the design of the intake and exhaust of equipment. If the high-concentration region is within the second threshold, the first determination unit 32 sends the hazard map 43 that satisfies the first condition to the disaster simulator 34.

[0043] The ventilation control update unit 33 is a functional block that performs design related to ventilation control within the engine room ER based on the determination result by the first determination unit 32. The ventilation control update unit 33 adds and changes the placement of ducts and fans within the engine room ER, and adds and changes the placement of bulkheads within the engine room ER. The ventilation control update unit 33 then reflects the design results in the ventilation control information 42.

[0044] The damage simulator 34 is a functional block having a function for calculating, for example, the risk of damage to crew members due to ammonia. The damage simulator 34 simulates, for each location within the engine room ER, the probability that crew members in the engine room ER will be harmed by ammonia leaked into the engine room ER of the ammonia-fueled ship 10. The damage simulator 34 executes a damage simulation process using, for example, a hazard map 43, work information 44, and equipment layout information 45 as input, and generates a damage risk map 46. The damage simulator 34 sends the generated damage risk map 46 to the second determination unit 35.

[0045] The work information 44 is information indicating what kind of work crew members are doing in the engine room ER and to what extent. Specifically, the work information 44 may include, for example, information indicating, for each piece of equipment located in the engine room ER, how many crew members are working on that equipment and how many hours per day they are working on that equipment.

[0046] The equipment layout information 45 is information about equipment arranged in the engine room ER. The equipment layout information 45 includes, for example, position information in the engine room ER of equipment that uses ammonia as fuel, such as the main engine 11 and the generator 12. The equipment layout information 45 also includes position information in the engine room ER of equipment that does not use ammonia as fuel.

[0047] By integrating the work information 44 and the equipment location information 45, the disaster simulator 34 can generate information on the probability density distribution of the presence probability of crew members in the engine room ER. Then, the disaster simulator 34 can estimate a disaster risk map 46 as the risk of crew members being injured based on the presence probability density distribution of the crew members and the hazard map 43. In other words, the disaster risk map 46 is information indicating the risk of crew members being injured due to an ammonia leak for each location in the engine room ER.

[0048] The second determination unit 35 is a functional block that determines whether the disaster risk map 46 satisfies the second condition. Specifically, the second determination unit 35 determines, for example, based on the disaster risk map 46, whether the area where the risk of crew injury due to an ammonia leak is equal to or greater than a third threshold is within a fourth threshold, as the second condition. If the area where the risk of crew injury due to an ammonia leak is equal to or greater than the third threshold (danger area) is not within the fourth threshold, the second determination unit 35 sends a determination result that the disaster risk map 46 does not satisfy the second condition to the equipment layout update unit 36. The second determination unit 35 may present, together with the determination result, second auxiliary information for reducing the danger area to the equipment layout update unit 36. The second auxiliary information for reducing the danger area may be, for example, information regarding changes to the equipment layout to reduce the number of workers in high-concentration areas. If the danger area is within the fourth threshold, the second determination unit 35 sends the ventilation control information 42 and the equipment layout information 45 that satisfy the second condition to the output unit 37 as the design result 47 .

[0049] The equipment layout update unit 36 ​​is a functional block that designs the layout of equipment in the engine room ER based on the determination result by the second determination unit 35. The equipment layout update unit 36 ​​changes the layout of equipment in the engine room ER, such as by moving equipment where crew members tend to gather away from high-concentration areas. The equipment layout update unit 36 ​​then reflects the design results in the equipment layout information 45.

[0050] The output unit 37 outputs the design result 47 to the user.

[0051] 2. Operation Next, the operation of the safety design device according to the embodiment will be described.

[0052] 2.1 Flowchart FIG. 4 is a flowchart showing an example of a safety design process in the safety design device according to the embodiment.

[0053] When the safety design process starts (START), the diffusion simulator 31 executes the diffusion simulation process based on the leakage case information 41 and the ventilation control information 42 (S1).

[0054] The diffusion simulator 31 generates a hazard map 43 as a result of the diffusion simulation process executed in the process of S1 (S2).

[0055] The first determination unit 32 determines whether or not the hazard map 43 generated in the process of S2 satisfies a first condition (S3).

[0056] If the hazard map 43 does not satisfy the first condition (S3; no), the first determination unit 32 outputs first auxiliary information based on the result of the diffusion simulation process to the ventilation control update unit 33 (S4).

[0057] The ventilation control update unit 33 redesigns the ventilation control in the engine room ER based on the first auxiliary information output in the processing of S4. The ventilation control update unit 33 updates the ventilation control information 42 based on the results of the redesign of the ventilation control (S5).

[0058] The diffusion simulator 31 executes a diffusion simulation process (S1) based on the leakage case information 41 and the ventilation control information 42 updated by the process of S5. Then, the subsequent processes of S2 to S5 are executed. In this manner, the processes of S1 to S5 are repeated until the hazard map 43 satisfies the first condition.

[0059] If the hazard map 43 satisfies the first condition (S3; yes), the disaster simulator 34 executes a disaster simulation process based on the hazard map 43, the work information 44, and the equipment layout information 45 (S6).

[0060] The disaster simulator 34 generates a disaster risk map 46 as a result of the disaster simulation process executed in the process of S6 (S7).

[0061] The second determination unit 35 determines whether or not the disaster risk map 46 generated in the processing of S7 satisfies the second condition (S8).

[0062] If the disaster risk map 46 does not satisfy the second condition (S8; no), the second determination unit 35 outputs second auxiliary information based on the result of the disaster simulation processing to the equipment layout update unit 36 ​​(S9).

[0063] The equipment layout update unit 36 ​​redesigns the equipment layout in the engine room ER based on the second auxiliary information output in the process of S9. The equipment layout update unit 36 ​​updates the equipment layout information 45 based on the results of the equipment layout redesign (S10).

[0064] The disaster simulator 34 executes a disaster simulation process (S6) based on the hazard map 43, the work information 44, and the equipment layout information 45 updated by the process of S10. Then, the subsequent processes of S7 to S10 are executed. In this manner, the processes of S6 to S10 are repeated until the disaster risk map 46 satisfies the second condition.

[0065] If the disaster risk map 46 satisfies the second condition (S8; yes), the second determination unit 35 sends the ventilation control information 42 and the equipment layout information 45 to the output unit 37 as the design result 47.

[0066] The output unit 37 outputs the design result 47 to the user (S11).

[0067] After the processing of S11, the safety design processing ends (END).

[0068] 2.2 Design Example Below is an example of the design result 47 output by the safety design process described above.

[0069] FIG. 5 is a diagram showing an example of an engine room of an ammonia-fueled ship designed by the safety design process in the safety design device according to the embodiment.

[0070] In Fig. 5, the X axis is an axis parallel to the horizontal plane and along the longitudinal direction of the ammonia-fueled ship 10. The Y axis is an axis parallel to the horizontal plane and along the width direction of the ammonia-fueled ship 10. The Y axis is perpendicular to the X axis. The Z axis is an axis perpendicular to the horizontal plane.

[0071] 5, the intake route from the outside of the ammonia-fueled ship 10 is indicated by a hollow arrow. The exhaust route of ammonia leaked in the engine room ER is indicated by a hatched arrow. The level of risk of damage in the event of ammonia leaking in the engine room ER is indicated by the density of the hatching.

[0072] As shown in Fig. 5, the engine room ER is composed of compartments that are connected to multiple floors provided above and below the deck DC. The engine room ER has, for example, a first floor F1, a second floor F2, a third floor F3, and a fourth floor F4 that are provided between the bottom BTM of the engine room ER and the deck DC, and a fifth floor F5, a sixth floor F6, a seventh floor F7, and an eighth floor F8 that are provided on the deck DC.

[0073] The main engine 11 is located on the first floor F1 of the engine room ER and extends in a direction perpendicular to the bottom surface of the engine room ER. In the example of FIG. 5 , the top of the main engine 11 reaches the second floor F2. As described above, the main engine 11 is a very large piece of equipment, and takes in a large amount of air when it is running. When the main engine 11 takes in air from the engine room ER, there is a possibility that it will also take in leaked ammonia. This is not preferable because it can cause the following main risks: - Injury to crew members due to ammonia flowing into areas where crew members may be working, such as the scavenge air room inside the main engine 11 - Fires due to ammonia flowing into areas where combustion gases may blow through, such as the space under the piston inside the main engine 11 - Poor combustion or misfires due to a decrease in the oxygen concentration in the combustion air - A decrease in the efficiency of directly discharging ammonia outside the engine room ER due to ammonia that should be exhausted being taken in by the main engine 11 For this reason, a direct suction system that directly draws in outside air from the ammonia-fueled ship 10 can be applied to the intake mechanism 11a of the turbocharger of the main engine 11.

[0074] Furthermore, since the main engine 11 is equipment that carries a risk of ammonia leakage, it is desirable to isolate it from other areas in the engine room ER if possible. However, since the main engine 11 is large, isolating the entire main engine 11 is not realistic. For this reason, a bulkhead PW may be designed to surround the upper part of the main engine 11, which has a relatively high risk of ammonia leakage. This makes it possible to prevent ammonia leaking from the main engine 11 from diffusing to the sides of the main engine 11.

[0075] The generator 12, like the main engine, is a piece of equipment that has a risk of ammonia leakage, and is smaller than the main engine 11. For this reason, the generator 12 can be arranged in a generator room GR isolated from other areas within the engine room ER. As with the generator 12, among the plurality of pieces of equipment 13, AF equipment (not shown) such as equipment for diluting, neutralizing, and combusting oil and water mixed with ammonia, equipment such as tanks for storing oil and water mixed with ammonia and piping for venting the tanks, and equipment such as pumps for transporting oil and water mixed with ammonia can be arranged in rooms isolated from other areas within the engine room ER.

[0076] Furthermore, since ammonia is a gas lighter than air, any leaked ammonia will basically diffuse upwards and be exhausted from the eighth floor F8. For this reason, the ceilings and floors of each floor of the engine room ER can be constructed with grating GT, except for areas such as the generator room GR that are intended to prevent the diffusion of ammonia.

[0077] Of the plurality of pieces of equipment 13, non-AF equipment 13a such as a cooling seawater pump and a cooling fresh water pump, which are frequently used by crew members, may be placed in locations with a relatively low risk of disaster, such as the first floor F1 and the second floor F2, rather than in locations with a relatively high risk of disaster, such as the third floor F3 to the eighth floor F8. As with the cooling seawater pump and the cooling fresh water pump, of the plurality of pieces of equipment 13, ordinary bilge pumps, sludge pumps, etc., which are not intended to treat ammonia, may be placed in locations with a relatively low risk of disaster, such as the first floor F1 and the second floor F2, or near an escape trunk or an evacuation route (not shown).

[0078] Furthermore, the workshop WS is a place where crew members spend a long time working. For this reason, in ships such as LNG-fueled ships where there is no risk of ammonia leakage, the workshop WS is often located on the third floor F3 or the fourth floor F4 from the viewpoint of workability. However, in the ammonia-fueled ship 10, the third floor F3 or the fourth floor F4 is at risk of damage from ammonia leaking from above the main engine 11. For this reason, in the ammonia-fueled ship 10, the workshop WS can be located in a place where the risk of damage is relatively low, such as the first floor F1 or the second floor F2, which are below the top of the main engine 11.

[0079] 3. Effects of the embodiment According to the embodiment, the diffusion simulator 31 performs a diffusion simulation in the engine room ER in the ammonia-fueled ship 10 based on the ventilation control information 42. The ventilation control update unit 33 updates the ventilation control information 42 based on the hazard map 43 generated by the diffusion simulation so as to reduce the first region where the ammonia concentration is equal to or greater than the threshold. The first determination unit 32 controls the execution of the diffusion simulation and the updating of the ventilation control information 42 to be repeated until the first region in the hazard map 43 satisfies the first condition. This makes it possible to minimize the risk of ammonia diffusion in the engine room ER in the ammonia-fueled ship 10.

[0080] The disaster simulator 34 also executes a crew disaster simulation based on the hazard map 43 that satisfies the first condition and the equipment layout information 45 in the engine room ER. The equipment layout update unit 36 ​​updates the equipment layout information 45 based on the disaster risk map 46 generated by the disaster simulation so as to reduce the second region in which the crew disaster risk is equal to or greater than the threshold. The second determination unit 35 controls the execution of the disaster simulation and the updating of the equipment layout information 45 to be repeated until the second region in the disaster risk map satisfies the second condition. The risk of ammonia disaster to crew in the engine room ER of the ammonia-fueled ship 10 can be minimized.

[0081] The output unit 37 outputs the ventilation control information 42 and the equipment layout information 45 corresponding to the disaster risk map 46 that satisfies the second condition as the design result 47. This enables the user to design an engine room in the ammonia-fueled ship 10 in which leaked ammonia is less likely to spread to the crew's work area.

[0082] The ventilation control information 42 also includes at least one piece of information selected from the arrangement of ducts, fans, equipment intake and exhaust mechanisms, and bulkheads in the engine room ER. This allows the ventilation control updating unit 33 to update the ventilation control information 42 based on the determination result of the hazard map 43 by the first determining unit 32 so as to make the intake mechanism 11a of the turbocharger of the main engine 11 a of a direct suction type from outside air. The ventilation control updating unit 33 can also update the ventilation control information 42 based on the determination result of the hazard map 43 by the first determining unit 32 so as to arrange a bulkhead PW surrounding the upper part of the main engine 11 so as to prevent lateral diffusion of ammonia leaking from the upper part of the main engine 11.

[0083] The equipment layout information 45 also includes at least one piece of information selected from the position of the workshop WS in the engine room ER, the position of the AF equipment (including the main engine 11 and the generator 12), and the position of the non-AF equipment. As a result, the equipment layout update unit 36 ​​can update the equipment layout information 45 based on the determination result of the damage risk map 46 by the second determination unit 35 so that the position of the workshop WS or the position of the non-AF equipment 13a such as a boiler is located below the upper part of the main engine 11. Based on the determination result of the damage risk map 46 by the second determination unit 35, the equipment layout update unit 36 ​​can also update the equipment layout information 45 so that the generator 12 or other AF equipment is isolated from the non-AF equipment in the engine room ER.

[0084] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention.

[0085] 1...safety design system, 10...ammonia-fueled ship, 11...main engine, 11a...intake mechanism, 12...generator, 13...plurality of equipment, 13a...non-AF equipment, 20...safety design device, 21...control circuit, 22...storage, 23...communication module, 24...user interface, 25...drive, 26...storage medium, 31...diffusion simulator, 32...first judgment unit, 33...ventilation control update unit, 34...disaster simulator, 35...second judgment unit, 36...equipment layout update unit, 41...leakage case information, 42...ventilation control information, 43...hazard map, 44...work information, 45...equipment layout information, 46...disaster risk map, 47...design results, engine room...ER, generator room...GR, workshop...WS, deck...DC, bottom...BTM, bulkhead...PW, grating GT.

Claims

1. A safety design method for the engine room of an ammonia-fueled ship, comprising: performing an ammonia diffusion simulation based on ventilation control information for the engine room on an ammonia-fueled ship; updating the ventilation control information based on a hazard map generated by the diffusion simulation so as to reduce a first area where the ammonia concentration is equal to or greater than a threshold; repeating the steps of performing the diffusion simulation and updating the ventilation control information until the first area in the hazard map satisfies a first condition; performing a crew damage simulation based on the hazard map, crew work information, and equipment layout information in the engine room that satisfies the first condition; updating the equipment layout information based on a damage risk map generated by the damage simulation so as to reduce a second area where the crew damage risk is equal to or greater than a threshold; repeating the steps of performing the damage simulation and updating the equipment layout information until the second area in the damage risk map satisfies a second condition; and outputting the ventilation control information and the equipment layout information corresponding to the damage risk map that satisfies the second condition as design results.

2. A safety design method according to claim 1, wherein the ventilation control information includes at least one piece of information selected from the number of ducts in the engine room, the number, capacity and type of fans, the intake and exhaust mechanisms of the equipment, and the layout of bulkheads.

3. A safety design method according to claim 1, wherein updating the ventilation control information includes arranging a bulkhead to surround the upper part of the main engine.

4. A safety design method according to claim 1, wherein the equipment location information includes at least one piece of information selected from the position of a workshop in the engine room, the position of equipment that handles ammonia, and the position of equipment that does not handle ammonia.

5. The safety design method according to claim 1, wherein updating the equipment layout information includes arranging the location of a workshop or the location of equipment that does not handle ammonia below the upper part of the main engine.

6. A safety design method according to claim 1, wherein updating the equipment layout information includes isolating equipment that handles ammonia from equipment that does not handle ammonia in the engine room.

7. An ammonia-fueled ship equipped with an engine room designed using the safety design method described in any one of claims 1 to 6.

8. A diffusion simulator that performs an ammonia diffusion simulation based on ventilation control information in the engine room on an ammonia-fueled ship; a ventilation control update unit that updates the ventilation control information based on a hazard map generated by the diffusion simulation so as to reduce a first region where the ammonia concentration is equal to or greater than a threshold; a first determination unit that repeats performing the diffusion simulation and updating the ventilation control information until the first region in the hazard map satisfies a first condition; a disaster simulator that performs a crew damage simulation based on the hazard map that satisfies the first condition, crew work information, and equipment layout information in the engine room; an equipment layout update unit that updates the equipment layout information based on a disaster risk map generated by the disaster simulation so as to reduce a second region where the crew damage risk is equal to or greater than a threshold; a second determination unit that repeats performing the disaster simulation and updating the equipment layout information until the second region in the disaster risk map satisfies a second condition; and an output unit that outputs the ventilation control information and equipment layout information corresponding to the disaster risk map that satisfies the second condition as design results. A safety design device for the engine room of an ammonia-fueled ship, comprising:

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