Space reservation arrangement structure of methanol dual-fuel system of giant trailing suction hopper dredger

Abstract

The utility model relates to a space reservation arrangement structure of a methanol dual-fuel system of a giant trailing suction hopper dredger. The arrangement structure comprises a methanol storage cabin, a methanol fuel preparation room, a methanol discharge cabin and an inert gas generator room, the methanol storage cabin, the methanol fuel preparation room and the inert gas generator room are reserved in a space above a deck and below a main deck in the first cabin; the methanol discharge cabin is reserved in the double-layer bottom empty cabin; a methanol daily cabin cabinet, a fuel valve group and a fuel supply unit are preset in the methanol fuel preparation room; an air compressor, an inert gas generator and a gas cylinder are arranged in the inert gas generator room in advance. The large trailing suction dredger has the advantages that the methanol storage cabin, the methanol fuel preparation room and the inert gas generator room are reserved in the space above the deck and below the main deck in the first cabin of the large trailing suction dredger, and the methanol discharge cabin is reserved in the double-layer bottom void cabin, so that the whole structure is slightly modified, the arrangement is easier, the modification efficiency is higher, and the cost is lower. Carbon dioxide emission is reduced by applying methanol, and the method is more environment-friendly.

Description

Technical Field

[0001] This utility model relates to the field of trailing suction hopper dredger technology, specifically to a space-reserved arrangement structure for a methanol dual-fuel system of a giant trailing suction hopper dredger. Background Technology

[0002] Giant trailing suction hopper dredgers traditionally use heavy fuel oil (HFO) or methanol-gasoline (MGO) as fuel. Compared to conventional fuel oil, using methanol as marine fuel can significantly reduce emissions of sulfur oxides, nitrogen oxides, and particulate matter, with only a small amount of emissions coming from diesel fuel used as ignition fuel. Therefore, ship operators can meet relevant emission regulations by switching to methanol, which will encourage wider use of methanol fuel. Methanol remains liquid under ambient temperature and pressure, allowing for more frequent refueling by operators. Methanol can be stored in conventional fuel tanks or even onboard ballast tanks, requiring less storage space than LNG or hydrogen. Driven by both convention regulations and customer demand, the global shipping industry's decarbonization is imperative. Methanol fuel has attracted widespread attention from the shipping industry due to its advantages such as low greenhouse gas emissions, ease of management, safety and reliability, and minimal need for retrofitting existing main engines.

[0003] Conventional dredgers, lacking pre-designed plans, are limited by cabin space and main engine type, making future modifications impossible or extremely costly. Existing pre-designed structures typically place methanol storage tanks, methanol day tanks, and fuel preparation rooms in the cargo hold area or on the main deck. This arrangement is suitable for container ships and liquid cargo ships, but for giant trailing suction hopper dredgers, the main deck has trailing pipes, dredging equipment, and large openings in the mud tanks, making it impossible to arrange fuel tanks and methanol fuel preparation rooms. The overall structure needs to be modified, making the layout more complicated. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a space-reserved layout structure for a methanol dual-fuel system of a giant trailing suction hopper dredger. This can solve the problems in the prior art where the methanol storage tank, methanol day tank and fuel preparation room are all arranged in the cargo hold area or on the main deck, the main deck is equipped with a trailing pipe, dredging equipment and a large opening in the mud tank, making it impossible to arrange the fuel tank and methanol fuel preparation room, the overall structure needs to be modified and the layout is more complicated.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: it includes a methanol storage tank, a methanol fuel preparation room, a methanol release tank, and an inert gas generator room; the methanol storage tank, the methanol fuel preparation room, and the inert gas generator room are reserved in the space above the first deck and below the main deck; the methanol release tank is reserved in the double-bottom empty tank.

[0006] The methanol fuel preparation room is reserved in the dredging spare parts room above the first deck and below the main deck. The methanol fuel preparation room is equipped with a methanol day tank, fuel valve group and fuel supply unit. The outlet of the methanol fuel preparation room is equipped with an airlock.

[0007] The inert gas generator room is reserved in the engine room above the first deck and below the main deck in the first compartment. The inert gas generator room is equipped with an air compressor, an inert gas generator, and a gas cylinder. The air compressor is connected to the inert gas generator, and the inert gas generator is connected to the gas cylinder. The gas cylinder is connected to the methanol storage tank and the methanol fuel preparation room through output pipes. The methanol storage tank is reserved in the space above the first deck and below the main deck in the first compartment near the bow.

[0008] Furthermore, the gas cylinders between the inert gas generators are also connected to the double-walled fuel pipeline system via a delivery pipeline for purging the double-walled fuel pipeline system to inertize it.

[0009] Furthermore, an isolation compartment is reserved around the methanol storage tank.

[0010] Furthermore, the methanol day tank and the methanol storage tank are respectively connected to the ventilated mast installed at the stern of the ship through closed vent pipes.

[0011] Furthermore, the methanol venting chamber is connected to the refueling station, the methanol fuel preparation room, the fuel pipe venting pipe, and the main engine venting pipe, respectively.

[0012] The advantages of this utility model after adopting the above structure are as follows: by reserving the space above the first deck and below the main deck of the giant trailing suction hopper dredger for the methanol storage tank, methanol fuel preparation room and inert gas generator room, and reserving the space in the double bottom empty tank, the methanol storage tank and methanol fuel preparation room are avoided from being arranged in the cargo hold area or above the main deck. They are not affected by the trailing pipes, dredging equipment and large openings of the mud tank arranged on the main deck. The overall structure is modified less and the arrangement is easier. The conversion efficiency of the giant trailing suction hopper dredger is higher. The application of the methanol dual fuel system can reduce carbon dioxide emissions and is more environmentally friendly. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments can enable those skilled in the art to more fully understand this utility model, but do not limit the present utility model to the scope of the described embodiments.

[0015] like Figure 1 As shown, the specific embodiment adopts the following technical solution: a space reserved arrangement structure for a methanol dual-fuel system of a giant trailing suction hopper dredger, including a methanol storage tank 1, a methanol fuel preparation room 2, a methanol release tank 3 and an inert gas generator room 4.

[0016] Methanol storage tank 1, methanol fuel preparation room 2 and inert gas generator room 4 are reserved to be arranged in the space above the first deck 20 and below the main deck 10; methanol release tank 3 is reserved to be arranged in the double bottom empty tank 30.

[0017] The methanol fuel preparation room 2 is reserved in the dredging spare parts room 5, which is located above the first deck 20 and below the main deck 10. The methanol fuel preparation room 2 is equipped with a methanol day tank 6, a fuel valve group and a fuel supply unit 7. The methanol day tank 6 is a Class 0 hazardous area, the methanol fuel preparation room 2 is a Class 1 hazardous area, and the outlet of the methanol fuel preparation room 2 is equipped with an airlock room 8, which is a Class 2 hazardous area.

[0018] The inert gas generator room 4 is reserved in the engine room above the first deck 20 and below the main deck 10. The inert gas generator room 4 is equipped with an air compressor 9, an inert gas generator 11, and a gas cylinder 12. The air compressor 9 is connected to the inert gas generator 11, and the inert gas generator 11 is connected to the gas cylinder 12. The gas cylinder 12 is connected to the methanol storage tank 1 and the methanol fuel preparation room 2 through output pipes. The gas cylinder 12 in the inert gas generator room 4 is also connected to the double-wall fuel pipeline system through a delivery pipe for purging the double-wall fuel pipeline system and the methanol storage tank 1 and the methanol fuel preparation room 2 for inertization.

[0019] The methanol venting chamber 3 is connected to the refueling station, the methanol fuel preparation room 2, the fuel pipe venting pipe and the main engine venting pipe, respectively, and collects the vented material from the refueling station, the methanol fuel preparation room 2, the fuel pipe venting pipe and the main engine venting pipe.

[0020] The methanol storage tank 1 is reserved in the space above the first deck 20 and below the main deck 10 near the bow. The methanol storage tank 1 is reserved around the isolation compartment 13, which is a Class 1 hazardous area. Each methanol storage tank 1 is equipped with a submersible pump, or a fuel transfer pump is installed in the compartment between the original MDO storage tank and HFO storage tank on the port side.

[0021] The methanol day tank 6 and the methanol storage tank 1 are respectively connected to the ventilated mast 14 set at the stern of the ship through closed vent pipes for closed ventilation of the methanol day tank 6 and the methanol storage tank 1.

[0022] The fuel valve assembly, fuel supply unit 7, air compressor 9, inert gas generator 11, gas cylinder 12 and venting mast 14 mentioned above are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods, and will not be described further.

[0023] Working principle: By reserving space above the first deck 20 and below the main deck 10 of the giant trailing suction hopper dredger for methanol storage tank 1, methanol fuel preparation room 2, and inert gas generator room 4, and reserving space in the double bottom empty tank for methanol release tank 3, the methanol storage tank 1 and methanol fuel preparation room 2 are avoided from being located in the cargo hold area or above the main deck. This avoids the impact of trailing pipes, dredging equipment, and large openings in the mud tank on the main deck. The overall structural modifications are small and the layout is relatively easy. The conversion efficiency of giant trailing suction hopper dredgers is higher. The application of the methanol dual-fuel system can reduce carbon dioxide emissions and is more environmentally friendly.

[0024] During the later stages of the conversion, the original HFO oil tanks were cleaned and coated with paint suitable for methanol. The overflow pipes of the HFO storage tanks (converted into methanol storage tanks) were blind-shut down, the vent pipes were changed to closed vents, and the inlet and outlet valves of the hot oil heating coils inside the tanks were closed and blind-shut down. The bilge water branch pipes in the empty tanks, which were converted into Class 1 hazardous areas, were blind-shut down and isolated from the bilge water in the safe areas. If the buoyancy empty space between the first and second inner decks on top of HFO storage tanks 1-4 is to be used as a pipeline passage, an isolation empty space needs to be set up on top of HFO storage tanks 1-4 as a fuel tank connection point (Class 1 hazardous space), accessible from the airlock. The HFO storage tanks and HFO sedimentation tanks were then converted into methanol storage tanks, utilizing a double bottom. Currently, there is an isolation empty space between the sedimentation tank and the engine room, making the conversion relatively convenient. The MDO storage tanks were converted into methanol storage tanks and methanol equipment rooms, utilizing a double bottom.

[0025] While methanol has a higher energy density than some other alternative transportation fuels, including liquefied natural gas (LNG), ammonia, and hydrogen, it is lower than that of traditional marine fuels. For example, MGO has an energy density of 36.6 GJ / m³, while methanol has an energy density of 15.8 GJ / m³. This means that the storage and fuel tank space required for a methanol-powered ship is approximately 2.4 times that of an MGO-powered ship. However, methanol remains liquid under ambient temperature and pressure, and operators can mitigate the low energy density issue through slightly more frequent refueling and the fact that methanol can be stored in traditional fuel tanks or even shipboard ballast tanks.

[0026] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A space-reserved arrangement structure for a methanol dual-fuel system on a giant trailing suction hopper dredger, characterized in that: It includes a methanol storage tank, a methanol fuel preparation room, a methanol venting tank, and an inert gas generator room; the methanol storage tank, methanol fuel preparation room, and inert gas generator room are reserved to be arranged in the space above the first deck and below the main deck; the methanol venting tank is reserved to be arranged in the double-bottom empty tank; The methanol fuel preparation room is reserved in the dredging spare parts room above the first deck and below the main deck. The methanol fuel preparation room is equipped with a methanol day tank, fuel valve group and fuel supply unit. The outlet of the methanol fuel preparation room is equipped with an airlock. The inert gas generator room is reserved in the engine room above the first deck and below the main deck in the first compartment. The inert gas generator room is equipped with an air compressor, an inert gas generator, and a gas cylinder. The air compressor is connected to the inert gas generator, and the inert gas generator is connected to the gas cylinder. The gas cylinder is connected to the methanol storage tank and the methanol fuel preparation room through output pipes. The methanol storage tank is reserved in the space above the first deck and below the main deck in the first compartment near the bow.

2. The space-reserved arrangement structure of a methanol dual-fuel system for a giant trailing suction hopper dredger according to claim 1, characterized in that: The gas cylinders between the inert gas generators are also connected to the double-walled fuel pipeline system via delivery pipes, for purging the double-walled fuel pipeline system to inertize it.

3. The space-reserved arrangement structure of a methanol dual-fuel system for a giant trailing suction hopper dredger according to claim 1, characterized in that: An isolation chamber is reserved around the methanol storage tank.

4. The space-reserved arrangement structure of a methanol dual-fuel system for a giant trailing suction hopper dredger according to claim 1, characterized in that: The methanol day tank and methanol storage tank are respectively connected to the ventilated mast set at the stern of the ship through closed vent pipes.

5. The space-reserved arrangement structure of a methanol dual-fuel system for a giant trailing suction hopper dredger according to claim 1, characterized in that: The methanol venting chamber is connected to the refueling station, the methanol fuel preparation room, the fuel pipe venting pipe, and the main engine venting pipe.

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