A method of arranging a biofuel storage tank for a triple-fuel bulk carrier

Abstract

The application discloses a kind of three fuel bulk cargo ship biological fuel storage cabin arrangement method, comprising the following steps: (1) in the upper deck of the stern side of the upper house living area of bulk cargo ship, there is airtight hollow shell, shell wall width d j ; (2) in airtight hollow shell, vertical along bow stern direction is set with midship bulkhead, and airtight hollow shell is divided into methanol fuel cabin I and right cavity along left and right sides direction symmetry;(3) in right cavity, vertical arrangement isolation empty cabin II in middle near bow side, and right cavity is divided into biological fuel storage cabin and methanol fuel cabin II along bow stern direction;(4) the cabin wall of biological fuel storage cabin near bow side and right side is respectively expanded d j width;(5) the cabin of conventional fuel is arranged in engine room below upper deck and stern cargo cabin top edge cabin, and daily cabin and sedimentation cabin are arranged in engine room below upper deck.The application realizes biological fuel under the premise of guaranteeing the cabin capacity of conventional fuel cabin and methanol fuel cabin.

Description

Technical Field

[0001] This invention relates to the field of three-fuel bulk carrier technology, and more specifically to a method for arranging biofuel storage tanks for three-fuel bulk carriers. Background Technology

[0002] Currently, there are more and more dual-fuel ships in operation and under construction in the market. However, due to the insufficient supply of green fuels (such as green methanol and green ammonia), in order to ensure the security of green fuel supply during operation, a three-fuel bulk carrier that can provide two green fuels on board is proposed to solve the problem of having another alternative green low-carbon fuel available when the supply of a single green fuel is insufficient.

[0003] Methanol, as a leading green and low-carbon marine fuel, has been well-established in the application of bulk carriers. Compared to ammonia and liquefied natural gas, methanol does not require cryogenic or pressure storage. Moreover, methanol fuel tanks are low in construction cost and easy to ensure safety, making them the preferred green and low-carbon fuel for three-fuel bulk carriers.

[0004] Biofuel is considered a green, low-carbon fuel with a complete life cycle. Produced from biomass (such as plants, waste oil, and agricultural waste), it possesses similar physical and chemical properties to marine diesel, thus exhibiting good storability. Furthermore, it can be used directly without requiring modifications to the engines and fuel delivery systems of methanol-fueled dual-fuel vessels, or with only minor modifications. Therefore, from a practical standpoint and to reduce construction costs, biofuel can be used as a supplementary and backup green, low-carbon fuel for tri-fuel bulk carriers.

[0005] Bulk carriers offer flexible routes, allowing a single voyage to pass through regions with strict carbon emission controls, such as the EU and "green shipping corridors," as well as other regions with more lenient carbon emission controls. To meet the diverse needs of different regions for green and low-carbon fuels and conventional fuels, ships need to be equipped with both green fuel tanks and conventional fuel tanks with sufficient capacity. Furthermore, considering the differences in chemical properties between conventional fuels, methanol fuels, and biofuels, different requirements are placed on coating corrosion protection, fuel supply, and refueling systems. Additionally, storing different fuels in the same fuel storage tank places higher demands on operation and maintenance. Therefore, to reduce ship operating costs, it is necessary to have independent conventional fuel tanks, methanol fuel tanks, and biofuel tanks on board, with their locations rationally configured.

[0006] On methanol dual-fuel bulk carriers, conventional fuel tanks are typically located in the engine room and the top side tanks of the stern cargo holds, while methanol fuel tanks are located on the upper deck aft of the living quarters. Due to the large volume of the methanol fuel tanks, the fuel supply system requires independent space. In addition, considering the stringent fire separation and hazardous area delineation, the layout space on dual-fuel bulk carriers is relatively compact.

[0007] Compared to dual-fuel methanol bulk carriers, tri-fuel bulk carriers of the same size face greater space constraints due to the addition of biofuel storage and supply systems. Furthermore, conventional layout methods generally have drawbacks, specifically: 1) If located in the engine room: The engine room needs to house the main engine, generators, engine control room, methanol fuel preparation room, NOx emission reduction equipment, and other rooms, compartments, and main and auxiliary equipment. There is no extra space for a biofuel storage tank. If a biofuel storage tank must be added... If located in the engine room, the engine room length needs to be increased, which reduces the length of the cargo hold. To ensure cargo hold capacity, the ship's main dimensions (length / beam / depth) must be increased, which will worsen ship performance and increase shipbuilding costs, thus harming the ship's operational economy. 2) If located in the cargo hold: Cargo hold capacity is a key hull type parameter. Dividing the cargo hold to set up biofuel storage tanks will inevitably significantly reduce cargo hold capacity and the ship's effective cargo carrying capacity, thereby reducing the ship type's market competitiveness. This is not something that shipyards and shipyards can easily achieve. The following are options that the ship is willing to accept: 3) If located in the ballast tank of the cargo hold area: If the biofuel storage tank is located in the ballast tank of the cargo hold area, in order to meet regulatory requirements, a double hull needs to be added to the side of the biofuel tank adjacent to the hull. This will result in a significant increase in hull steel and pipelines, which is not conducive to operation and maintenance during operation. At the same time, it will reduce the ballast required for normal ship operation and will not be conducive to the ship's buoyancy adjustment; 4) If located in the steering gear room: In addition to the steering gear, the steering gear room generally also houses fresh water tanks and drinking water tanks, etc. The layout is relatively compact, ensuring that 5) If located in the forecastle or bow: The forecastle and bow are relatively spacious, but they are far from the main engine. If the biofuel storage tank is located here, a large number of pipelines and high-lift pumps will be required, which will increase the cost significantly. 6) If located on the upper deck of the cargo hold: Due to the requirements for the arrangement of cargo hold hatch covers, cranes, mooring and cable-stayed equipment, ventilation overflow pipelines, and passage space, there is no extra space on the upper deck of the cargo hold to arrange the biofuel storage tank.

[0008] In addition, the IMO and various classification societies have specific requirements for the layout of biofuel storage tanks, including: 1) Coating and corrosion protection requirements: Common biofuels generally include FAME (fatty acid methyl esters), HVO (hydrogenated vegetable oil), SVO (saturated vegetable oil), and BTL (glycerol or other biomass liquids). Among them, FAME has poor oxidative stability and may form free fatty acids in the fuel after absorbing water, which can breed microorganisms and easily corrode the tank wall structure. Therefore, biofuel storage tanks need to select coatings according to the characteristics of biofuels and carry out appropriate coating construction. 2) Leakage risk control: In the event of an accidental leak of biofuel, it can contaminate other areas. When placed on the upper deck, there is also a risk of leakage into the marine environment. Therefore, when arranging biofuel storage tanks, safety regulations and risk management issues in the event of biofuel leaks and other accidents must be considered.

[0009] Therefore, in order to ensure the safety and economy of ship operation, and also to improve the competitiveness of ship design and construction, how to reasonably arrange biofuel storage tanks on three-fuel bulk carriers has become an urgent problem to be solved. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a method for arranging biofuel storage tanks for three-fuel bulk carriers, which realizes the simultaneous loading of biofuel while ensuring the capacity of conventional fuel tanks and methanol fuel tanks. This solves the problems of biofuel storage tank layout space, material compatibility, corrosion and leakage risk management, etc., and improves the safety, operating economy and shipping competitiveness of three-fuel bulk carriers in green and low-carbon fuel supply.

[0011] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The innovative aspect of the present invention's method for arranging biofuel storage tanks for three-fuel bulk carriers lies in including the following steps:

[0012] (1) A closed hollow hull is provided on the upper deck on the stern side of the superstructure living area of ​​the bulk carrier, and the width of the hull wall is [missing information]. d j Furthermore, the sealed hollow shell is symmetrically arranged with respect to the central axis of the bulk carrier.

[0013] (2) A matching longitudinal bulkhead is provided vertically in the bow and stern direction inside the sealed hollow shell, and the longitudinal bulkhead is located at the centerline of the bulk carrier, and the sealed hollow shell is symmetrically divided into methanol fuel tank I and starboard cavity in the port and starboard directions.

[0014] (3) A matching L-shaped isolation compartment II is vertically arranged in the middle of the right cavity near the bow. This isolation compartment II divides the right cavity into a biofuel storage compartment and a methanol fuel compartment II along the bow and stern direction.

[0015] (4) Widen the bow bulkhead and starboard bulkhead of the biofuel storage tank outwards respectively. d j Width, and ensure that the tops of the biofuel storage tank, methanol fuel tank I, and isolated empty tank II are at the same height;

[0016] (5) The conventional fuel tanks are arranged in the engine room below the upper deck on the stern side and in the top side of the cargo hold at the stern, and the day service tanks and sedimentation tanks are arranged in the engine room below the upper deck on the bow side.

[0017] Preferably, in step (2) above, the length of the methanol fuel tank I along the head-to-tail direction is... l t And its width along the port and starboard directions is b t .

[0018] Preferably, in step (3) above, the capacity of the biofuel storage tank is adjusted by controlling the setting position of the isolation empty chamber II along the head and tail direction.

[0019] Preferably, in step (3) above, the width of the isolation chamber II is d s Furthermore, its right-angled side is set close to the midship bulkhead along the bow and stern direction, and its end face is flush with the bow side bulkhead of the methanol fuel tank I, thereby separating the biofuel storage tank from the methanol fuel tank I and ensuring that the biofuel and methanol fuel do not contaminate each other; the other right-angled side of the isolation compartment II is set along the port and starboard direction, and its end face is flush with the starboard side bulkhead of the methanol fuel tank II, thereby separating the biofuel storage tank from the methanol fuel tank II and ensuring that the biofuel and methanol fuel do not contaminate each other.

[0020] Preferably, the hollow shell enclosure space described in step (1) above is configured as an isolation chamber I, and the width of the isolation chamber I is... d j Furthermore, the methanol fuel tank I and methanol fuel tank II are isolated and protected by the isolation empty compartment I.

[0021] Preferably, the starboard side bulkhead of the isolation compartment I is flush with the starboard side bulkhead of the biofuel storage tank, and the bow side end face of the starboard side bulkhead of the isolation compartment I is abutted against the stern side bulkhead of the biofuel storage tank; the bow side bulkhead of the isolation compartment I is flush with the bow side bulkhead of the biofuel storage tank, and the starboard side end face of the bow side bulkhead of the isolation compartment I is abutted against the port side bulkhead of the biofuel storage tank.

[0022] Preferably, the isolation chamber I is connected to the isolation chamber II, and a vent pipe or vacuum pressure relief valve is provided on the top of the biofuel storage chamber; the walls of the biofuel storage chamber, the day use chamber and the sedimentation chamber are all coated with pure epoxy, and the manhole cover gaskets in the biofuel storage chamber, the day use chamber and the sedimentation chamber are all made of fluororubber resistant to grease solvents.

[0023] Preferably, this is to compensate for the loss of methanol fuel tank II capacity due to the installation of the biofuel storage tank. V t The height of methanol fuel tank I, methanol fuel tank II, and biofuel storage tank will be increased compared to the conventional setting height. V t / ( 2l t *b t ).

[0024] Preferably, the system also includes a connecting platform and oil containment panels; a connecting platform is provided between the biofuel storage tank and the superstructure living area, and between the isolation compartment I and the superstructure living area, with both ends of the connecting platform connected to the superstructure living area and the corresponding biofuel storage tank and isolation compartment I, respectively, thereby increasing the overall rigidity of the biofuel storage tank, the superstructure living area, and the isolation compartment I; oil containment panels are also provided along their length on the upper deck at the bow side bulkhead and the starboard side bulkhead relative to the biofuel storage tank, and a pipeline is provided below the oil containment panels to divert leaked biofuel to the biofuel waste oil collection tank.

[0025] Preferably, in step (5) above, the day use compartment and the sedimentation compartment are shared compartments for biofuel and conventional fuel, and before switching to conventional fuel and biofuel, the inner walls of the compartment and the pipeline equipment components in contact with biofuel need to be cleaned and the coatings checked.

[0026] The beneficial effects of this invention are:

[0027] (1) This invention enables the simultaneous loading of biofuel while ensuring the capacity of conventional fuel tanks and methanol fuel tanks. It solves problems such as the layout space of biofuel storage tanks, material compatibility, corrosion and leakage risk management, and improves the safety, operating economy and shipping competitiveness of three-fuel bulk carriers in green and low-carbon fuel supply.

[0028] (2) This invention solves the contradiction between the capacity of the biofuel storage tank and the limited space layout without reducing the capacity of the cargo hold and ballast tank;

[0029] (3) The present invention effectively addresses the challenges of the chemical properties of biofuels and reduces the risk of incompatibility and corrosion of biofuel storage tank materials;

[0030] (4) The present invention arranges the biofuel storage tank on the upper deck, which does not occupy the ballast tank space of the engine room and cargo area, making it convenient for daily inspection and maintenance of the ship. At the same time, in case of emergency such as fire and fuel leak, it can better ensure the safety of the ship and personnel. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the layout of the biofuel storage tank of the present invention.

[0033] Figure 2 for Figure 1 Top view.

[0034] Figure 3 for Figure 1 Cross-sectional view.

[0035] Among them, 1-Biofuel storage tank; 2-Day use tank and sedimentation tank; 3-Methanol fuel tank I; 4-Isolation empty tank I; 5-Conventional fuel tank; 6-Upper deck; 7-Engine hangar and chimney; 8-Superstructure living area; 9-Engine room; 10-Steering gear room; 11-Stern tip tank; 12-Stern cargo hold top side tank; 13-Methanol fuel tank II; 14-Central longitudinal bulkhead; 15-Connecting platform; 16-Isolation empty tank II; 17-Oil containment plate. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0037] The present invention provides a method for arranging biofuel storage tanks for three-fuel bulk carriers, such as... Figures 1-3 As shown, it includes the following steps:

[0038] (1) A sealed hollow hull is provided on the upper deck 6 on the stern side of the superstructure living area 8 of the bulk carrier. The width of the hull wall is: d j Furthermore, the sealed hollow hull is symmetrically arranged with respect to the central axis of the bulk carrier.

[0039] (2) A matching longitudinal bulkhead 14 is provided vertically along the bow and stern direction inside the sealed hollow shell, and the longitudinal bulkhead 14 is located at the centerline of the bulk carrier, and the sealed hollow shell is symmetrically divided into methanol fuel tank I3 and starboard cavity along the port and starboard directions.

[0040] In the above steps, the length of methanol fuel tank I3 along the head-to-tail direction is... l t And its width along the port and starboard directions is b t .

[0041] (3) An L-shaped isolation compartment II16 is vertically arranged in the middle of the right cavity near the bow side, which divides the right cavity into a biofuel storage compartment 1 and a methanol fuel compartment II13 along the bow and stern direction.

[0042] In the above steps, the volume of the biofuel storage tank 1 is adjusted by controlling the setting position of the isolation chamber II16 along the bow and stern directions.

[0043] In the above steps, the width of the isolation chamber II16 is... d s Furthermore, its right-angled side is set close to the mid-longitudinal bulkhead 14 along the bow and stern direction, and its end face is set flush with the bow side bulkhead of methanol fuel tank I3, thereby separating biofuel storage tank 1 from methanol fuel tank I3 and ensuring that biofuel and methanol fuel will not contaminate each other; the other right-angled side of the isolation compartment II 16 is set along the port and starboard direction, and its end face is set flush with the starboard side bulkhead of methanol fuel tank II 13, thereby separating biofuel storage tank 1 from methanol fuel tank II 13 and ensuring that biofuel and methanol fuel will not contaminate each other.

[0044] (4) Widen the bow bulkhead and starboard bulkhead of biofuel storage tank 1 outwards respectively. d j Width, and ensure that the tops of biofuel storage tank 1, methanol fuel tank I 3, and isolation empty tank II 16 are at the same height;

[0045] In this invention, the hollow shell enclosure space described in step (1) above is configured as an isolation chamber I, and the width of the isolation chamber I 4 is... d j Furthermore, the methanol fuel tank I3 and methanol fuel tank II13 are isolated and protected by the isolation empty compartment I4.

[0046] like Figures 1-3As shown, the starboard side bulkhead of the isolation compartment I4 is flush with the starboard side bulkhead of the biofuel storage tank 1, and the bow side end of the starboard side bulkhead of the isolation compartment I4 is abutted against the stern side bulkhead of the biofuel storage tank 1; the bow side bulkhead of the isolation compartment I4 is flush with the bow side bulkhead of the biofuel storage tank 1, and the starboard side end of the bow side bulkhead of the isolation compartment I4 is abutted against the port side bulkhead of the biofuel storage tank 1.

[0047] like Figures 1-3 As shown, the isolation chamber I4 is connected to the isolation chamber II16, and a vent pipe or vacuum pressure relief valve is installed on the top of the biofuel storage chamber 1; the walls of the biofuel storage chamber 1, the day use chamber and the sedimentation chamber 2 are all coated with pure epoxy, and the manhole cover gaskets in the biofuel storage chamber 1, the day use chamber and the sedimentation chamber 2 are all made of fluororubber resistant to grease solvents.

[0048] This invention aims to compensate for the loss of methanol fuel tank II13 capacity due to the installation of biofuel storage tank 1. V t The heights of methanol fuel tank I3, methanol fuel tank II13, and biofuel storage tank 1 will be increased compared to the conventional design height. V t / ( 2l t * b t ).

[0049] like Figures 1-3 As shown, a connecting platform 15 is provided between the biofuel storage tank 1 and the superstructure living area 8, and between the isolation compartment I4 and the superstructure living area 8. The two ends of the connecting platform 15 are connected to the superstructure living area 8 and the corresponding biofuel storage tank 1 and isolation compartment I4, respectively, thereby increasing the overall rigidity of the biofuel storage tank 1, the superstructure living area 8 and the isolation compartment I4 and improving their overall vibration resistance. On the upper deck 6, oil containment panels 17 are provided along their length at the bow side bulkhead and the starboard side bulkhead of the biofuel storage tank 1, respectively. Pipelines are provided below the oil containment panels 17, and leaked biofuel is diverted to the biofuel waste oil collection tank through the pipelines to prevent further leakage of biofuel into the marine environment.

[0050] (5) The conventional fuel tank 5 is arranged in the engine room 9 below the upper deck 6 on the stern side and in the top side compartment 12 of the stern cargo hold, and the day use compartment and sedimentation compartment 2 are arranged in the engine room 9 below the upper deck 6 on the bow side.

[0051] In the above steps, in order to improve space utilization and reduce steel usage, the day use compartment and sedimentation compartment 2 are shared compartments for biofuel and conventional fuel. Before switching between conventional fuel and biofuel, the inner walls of the compartment and the pipeline equipment components in contact with biofuel must be cleaned and the coatings inspected.

[0052] To enable rapid cleaning and inspection of the day use tank and sedimentation tank 2, and to facilitate quick switching between biofuel and conventional fuel, the reinforced structure of the day use tank and sedimentation tank 2 can be arranged on the outside of the tank.

[0053] The beneficial effects of this invention are:

[0054] (1) This invention enables the simultaneous loading of biofuel while ensuring the capacity of conventional fuel tank 5 and methanol fuel tank. It solves problems such as the layout space of biofuel storage tank 1, material compatibility, corrosion and leakage risk management, and improves the safety, operating economy and shipping competitiveness of three-fuel bulk carriers in green and low-carbon fuel supply.

[0055] (2) This invention solves the contradiction between the capacity of the biofuel storage tank 1 and the limited space layout without reducing the capacity of the cargo hold and ballast tank;

[0056] (3) The present invention effectively addresses the challenges of the chemical properties of biofuels and reduces the risk of material incompatibility and corrosion in the biofuel storage tank 1;

[0057] (4) The present invention arranges the biofuel storage tank 1 on the upper deck 6, which does not occupy the ballast tank space of the engine room 9 and the cargo area, making it convenient for daily inspection and maintenance of the ship. At the same time, in case of emergency such as fire and fuel leakage, it can better ensure the safety of the ship and personnel.

[0058] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A method for arranging biofuel storage tanks on a three-fuel bulk carrier, characterized in that... Includes the following steps: (1) A sealed hollow hull is provided on the upper deck on the stern side of the superstructure living area of ​​the bulk carrier, and the width of the hull wall is [missing information]. d j Furthermore, the sealed hollow shell is symmetrically arranged with respect to the central axis of the bulk carrier. (2) A matching longitudinal bulkhead is provided vertically in the bow and stern direction inside the sealed hollow shell, and the longitudinal bulkhead is located at the centerline of the bulk carrier, and the sealed hollow shell is symmetrically divided into methanol fuel tank I and starboard cavity in the port and starboard directions. (3) A matching L-shaped isolation compartment II is vertically arranged in the middle of the right cavity near the bow. This isolation compartment II divides the right cavity into a biofuel storage compartment and a methanol fuel compartment II along the bow and stern direction. (4) Widen the bow bulkhead and starboard bulkhead of the biofuel storage tank outwards respectively. d j Width, and ensure that the tops of the biofuel storage tank, methanol fuel tank I, and isolated empty tank II are at the same height; (5) The conventional fuel tanks are arranged in the engine room below the upper deck on the stern side and in the top side of the cargo hold at the stern, and the day service tanks and sedimentation tanks are arranged in the engine room below the upper deck on the bow side.

2. The method for arranging biofuel storage tanks on a three-fuel bulk carrier according to claim 1, characterized in that: In step (2) above, the length of the methanol fuel tank I along the head-to-tail direction is l t And its width along the port and starboard sides is b t .

3. The method for arranging biofuel storage tanks on a three-fuel bulk carrier according to claim 1, characterized in that: In step (3) above, the capacity of the biofuel storage tank is adjusted by controlling the setting position of the isolation empty chamber II along the head and tail direction.

4. The method for arranging biofuel storage tanks on a three-fuel bulk carrier according to claim 1, characterized in that: In step (3) above, the width of the isolation chamber II is d s Furthermore, its right-angled side is set close to the midship bulkhead along the bow and stern direction, and its end face is flush with the bow side bulkhead of the methanol fuel tank I, thereby separating the biofuel storage tank from the methanol fuel tank I and ensuring that the biofuel and methanol fuel do not contaminate each other; the other right-angled side of the isolation compartment II is set along the port and starboard direction, and its end face is flush with the starboard side bulkhead of the methanol fuel tank II, thereby separating the biofuel storage tank from the methanol fuel tank II and ensuring that the biofuel and methanol fuel do not contaminate each other.

5. The method for arranging biofuel storage tanks on a three-fuel bulk carrier according to claim 1, characterized in that: The hollow shell enclosure space described in step (1) above will be configured as isolation chamber I; the width of isolation chamber I is d j Furthermore, the methanol fuel tank I and methanol fuel tank II are isolated and protected by the isolation empty compartment I.

6. The method for arranging biofuel storage tanks for a three-fuel bulk carrier according to claim 5, characterized in that: The starboard side bulkhead of the isolation compartment I is flush with the starboard side bulkhead of the biofuel storage tank, and the bow side end of the starboard side bulkhead of the isolation compartment I is abutted against the stern side bulkhead of the biofuel storage tank; the bow side bulkhead of the isolation compartment I is flush with the bow side bulkhead of the biofuel storage tank, and the starboard side end of the bow side bulkhead of the isolation compartment I is abutted against the port side bulkhead of the biofuel storage tank.

7. The method for arranging biofuel storage tanks for a three-fuel bulk carrier according to claim 5, characterized in that: The isolation chamber I is connected to the isolation chamber II, and a vent pipe or vacuum pressure relief valve is installed on the top of the biofuel storage chamber; the walls of the biofuel storage chamber, the day use chamber and the sedimentation chamber are all coated with pure epoxy, and the manhole cover gaskets in the biofuel storage chamber, the day use chamber and the sedimentation chamber are all made of fluororubber resistant to grease solvents.

8. The method for arranging biofuel storage tanks for a three-fuel bulk carrier according to claim 1, characterized in that: To compensate for the loss of methanol fuel tank II capacity due to the installation of the biofuel storage tank. V t The height of methanol fuel tank I, methanol fuel tank II, and biofuel storage tank will be increased compared to the conventional setting height. V t / ( 2l t *b t ).

9. The method for arranging biofuel storage tanks on a three-fuel bulk carrier according to claim 5, characterized in that: It also includes a connecting platform and oil containment panels; a connecting platform is provided between the biofuel storage tank and the superstructure living area, and between the isolation compartment I and the superstructure living area. The two ends of the connecting platform are respectively connected to the superstructure living area and the corresponding biofuel storage tank and isolation compartment I, thereby increasing the overall rigidity of the biofuel storage tank, the superstructure living area and the isolation compartment I; oil containment panels are also provided along their length on the upper deck at the bow side bulkhead and the starboard side bulkhead relative to the biofuel storage tank, and pipelines are provided below the oil containment panels to divert leaked biofuel to the biofuel waste oil collection tank.

10. The method for arranging biofuel storage tanks for a three-fuel bulk carrier according to claim 1, characterized in that: In step (5) above, the day use tank and the sedimentation tank are shared tanks for biofuel and conventional fuel. Before switching between conventional fuel and biofuel, the inner walls of the tank and the pipeline equipment components that come into contact with biofuel must be cleaned and the coatings inspected.

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