Arrangement of a methanol powered system for a dual fuel drag suction dredger

Abstract

The present application relates to a kind of arrangement of methanol-powered system of dual-fuel drag suction dredger, methanol storage cabin is arranged in the buoyancy side of the two sides of mud cabin, the front, rear and upper of methanol storage cabin are isolated from other cabins by isolated empty cabin, the outside of methanol storage cabin is directly to the outer plate below light waterline, and isolated empty cabin is arranged between the outer plate above light waterline;Methanol fuel preparation room is provided on the first cabin deck above engine room, and methanol daily use cabin and methanol release cabin are provided in methanol fuel preparation room;Methanol delivery pipe for transporting methanol fuel is provided between methanol storage cabin and methanol daily use cabin;Methanol delivery pipe is arranged in the empty cabin between the second cabin deck and the first cabin deck.The methanol storage cabin of the present application is in the buoyancy side cabin outside mud cabin, effectively utilizes the space of the side cabin of mud cabin;Methanol fuel preparation room and methanol daily use cabin are arranged on the deck above engine room, effectively utilize cabin, reduce the occupation of deck.

Description

Technical Field

[0001] This invention relates to a trailing suction hopper dredger that can use two types of fuel, and particularly to an arrangement structure of a methanol power system for a dual-fuel trailing suction hopper dredger. Background Technology

[0002] A dual-fuel trailing suction hopper dredger refers to a dredger that can use two types of fuel. The first fuel is fuel oil, and the second fuel is methanol.

[0003] Currently, most of the methanol dual-fuel ships disclosed in patent documents are container ships and liquid cargo ships, with methanol day tanks, fuel preparation rooms and methanol storage tanks all located in the ship's cargo hold area.

[0004] Patent application CN113047994A discloses an arrangement for a methanol fuel containment and supply system in a methanol / fuel dual-fuel ship. The arrangement disclosed in this patent application is as follows: the methanol storage tank is located above or below the main deck in the cargo hold area, while the methanol fuel day tank and fuel preparation room are located above the main deck. The main deck of a liquid cargo ship offers ample usable space, allowing for a better arrangement of the methanol storage tank, day tank, and fuel preparation room.

[0005] Patent application CN115092331A discloses a dual-fuel container ship. This technical solution is a patent application for the arrangement of methanol fuel-related equipment on a container ship. In this solution, the methanol fuel day tank and methanol fuel preparation room are arranged in the methanol fuel processing tank located forward of the engine room and below the container stacking area; a portion of the cargo hold space is used for the methanol fuel processing tank.

[0006] Patent application CN115158539A discloses an arrangement of a methanol fuel containment and supply system for a dual-fuel large container ship. This technical solution is a patent application for the arrangement of methanol fuel-related equipment on container ships. In this solution, the methanol fuel day tank and methanol fuel preparation room are located in the container loading area at the bow of the engine room hangar above the main deck.

[0007] The above existing layout schemes are more suitable for transport vessels such as container ships and liquid cargo ships, but not for trailing suction hopper dredgers. The main reason is:

[0008] The mud hopper opening of a trailing suction hopper dredger occupies a large area of ​​space, making it impossible to arrange a methanol fuel preparation room in the mud hopper area; the trailing suction hopper dredger has a trailing pipe, dredging equipment and a large mud hopper opening on the main deck, and there is no space on the main deck to arrange a fuel tank and a fuel preparation room.

[0009] In existing technologies, methanol storage tanks, methanol day-use tanks, and fuel preparation rooms are all located in the cargo hold area or above the main deck. This arrangement is suitable for container ships and liquid cargo ships. However, for trailing suction hopper dredgers, the main deck has trailing pipes, dredging equipment, and large openings in the mud hopper, making it impossible to arrange fuel tanks and methanol fuel preparation rooms. If the methanol day-use tanks and fuel preparation rooms are both located in the mud hopper side tanks below the main deck, it would occupy a large amount of space for methanol storage tanks, and the side tanks are narrow, leaving insufficient space for the fuel preparation room. Therefore, existing technologies have shortcomings and are not suitable for the technical characteristics of dual-fuel trailing suction hopper dredgers. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and, in combination with the characteristics of trailing suction hopper dredgers, to provide an arrangement structure for the methanol power system of a dual-fuel trailing suction hopper dredger.

[0011] To achieve the above objectives, the technical solution of the present invention is: an arrangement structure of a methanol power system for a dual-fuel trailing suction hopper dredger, comprising a methanol storage tank arranged within the buoyancy sides of the dredging tank, the methanol storage tank being isolated from other compartments at its front, rear, and top by isolation compartments, the outer portion of the methanol storage tank below the light load waterline directly connecting to the outer plating, and an isolation compartment between the portion above the light load waterline and the outer plating; a methanol fuel preparation room is provided on the first inner deck above the engine room, the methanol fuel preparation room containing a methanol day use tank and a methanol venting tank; a methanol delivery pipe for transporting methanol fuel is provided between the methanol storage tank and the methanol day use tank; the methanol delivery pipe is located in the compartment between the second inner deck and the first inner deck.

[0012] Furthermore, the methanol storage tank is a steel structure container without insulation materials or shielding layers.

[0013] Furthermore, the top of the methanol storage tank is equipped with a fuel tank connection point; a transfer pump is installed inside the methanol storage tank to transfer fuel from the methanol fuel storage tank to the methanol day use tank.

[0014] Furthermore, the exterior of the methanol fuel preparation room is equipped with an isolated empty compartment.

[0015] Furthermore, the methanol storage tank is connected to a first vent valve, which is located in the open deck area of ​​the main deck; the methanol day use tank is connected to a second vent valve, which is located in the open deck area of ​​the main deck; and the methanol venting tank is connected to a third vent valve, which is located in the open deck area of ​​the main deck.

[0016] Furthermore, the methanol storage tank, methanol daily use tank, and methanol release tank are all equipped with pressure sensors and connected to the alarm system as redundancy of the controlled venting system to release any possible overpressure and vacuum.

[0017] Furthermore, the methanol fuel preparation room is equipped with a methanol venting tank discharge pump to safely transport contaminated liquid fuel to the shore receiving device; the methanol fuel preparation room is also equipped with a methanol fuel supply unit, which is connected to the methanol day use tank.

[0018] Furthermore, the engine room is equipped with a methanol dual-fuel boiler connected to the methanol fuel supply unit, or a methanol dual-fuel generator set connected to the methanol fuel supply unit, or a methanol dual-fuel main engine connected to the methanol fuel supply unit.

[0019] Furthermore, the main deck is equipped with a methanol fuel supply auxiliary equipment room, which contains a water-ethylene glycol heat exchanger and a circulating pump set for heating or cooling the methanol in the methanol fuel supply unit; the methanol fuel supply auxiliary equipment room is also equipped with a nitrogen generator unit for replenishing and inerting the methanol storage tank, methanol day tank and methanol venting tank and for purging the methanol pipeline.

[0020] Furthermore, there are two methanol refueling stations on the main deck, located near the port and starboard sides respectively; each methanol refueling station has a fuel filling port and an evaporative gas return port.

[0021] The beneficial effects of this invention are:

[0022] In this invention, the methanol storage tank is located in the buoyancy side tank outside the mud tank, effectively utilizing the space of the mud tank side tank; the methanol fuel preparation room and methanol day use tank are arranged above the engine room, effectively utilizing the space and reducing deck space occupation; the methanol fuel refueling station is arranged on both sides of the ship near the stern area, avoiding dredging equipment and facilitating the berthing of the methanol fuel refueling vessel; this invention effectively combines the refueling, storage, processing, and use of methanol fuel with the layout characteristics of the trailing suction hopper dredger, maximizing the space utilization of the ship, and providing a feasible technical solution for the design and layout of the methanol fuel system of the trailing suction hopper dredger. The use of methanol fuel by the trailing suction hopper dredger will significantly reduce the consumption of fossil fuels, reduce exhaust emissions, and help achieve the "dual carbon" goal. Attached Figure Description

[0023] Figure 1 This is a side view schematic diagram of an embodiment of the present invention;

[0024] Figure 2 This is a top view of the first cabin deck in an embodiment of the present invention;

[0025] Figure 3 This is a top view of the second cabin deck in an embodiment of the present invention;

[0026] Figure 4 This is a top-down view of the cabin in an embodiment of the present invention;

[0027] Figure 5 This is a cross-sectional view along the width of the ship at the location of the methanol storage tank, which is a preferred embodiment of the present invention.

[0028] Explanation of the numbers in the attached diagram: 1-Methanol storage tank, 2-Methanol daily use tank, 3-Methanol fuel preparation room, 4-Fuel tank connection location, 5-Methanol delivery pipe, 6-Methanol delivery pump, 7-Methanol refueling pipe, 8-Methanol vapor recovery pipe, 9-Methanol refueling station, 10-Isolation empty tank, 11-Light load waterline, 12-Main deck, 13-First internal deck, 14-Second internal deck, 15-Mud tank, 16-Fuel storage tank, 17-Engine room, 18-Main engine methanol fuel supply unit, 19-Generate set methanol fuel supply unit, 20-Boiler methanol fuel supply unit, 21-Methanol fuel supply pipeline, 22-Methanol dual-fuel main engine. 23-Methanol dual-fuel generator set; 24-Methanol dual-fuel boiler; 25-Airlock; 26-Methanol fuel supply auxiliary equipment room; 27-Water-ethylene glycol heat exchanger; 28-Circulating pump; 29-Nitrogen generator unit; 30-Side passageway; 31-Methanol storage tank vent pipe; 32-Methanol storage tank vent main pipe; 33-Methanol storage tank vent valve; 34-Side bulkhead of mud tank; 35-Methanol day use tank vent pipe; 36-Methanol day use tank vent valve; 37-Methanol venting tank vent pipe; 38-Methanol venting tank vent valve; 39-Methanol venting tank; 40-Methanol venting tank discharge pump; 41-Methanol tank pressure sensor; 42-Pump room. Detailed Implementation

[0029] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0030] like Figures 1 to 5 As shown in the figure, the arrangement structure of a methanol power system for a dual-fuel trailing suction hopper dredger provided by the present invention includes a methanol storage tank 1, which is a buoyancy side tank located outside the dredging tank; an isolation compartment 10 is provided around the methanol storage tank 1; a fuel oil storage tank 16 is also located as a buoyancy side tank outside the dredging tank, and an isolation compartment 10 is provided between the fuel oil storage tank 16 and the methanol storage tank 1.

[0031] Methanol storage compartment 1 is a steel structure compartment without insulation materials or shielding layers.

[0032] The main deck 12 is equipped with two methanol refueling stations 9, which provide methanol refueling interfaces. The two methanol refueling stations are located near the port and starboard sides respectively, making it convenient for the ship to berth at the dock on either port or starboard side to refuel with methanol fuel.

[0033] A methanol refueling double-walled pipe 7 is installed between the methanol refueling station 9 and the methanol storage tank 1. Methanol fuel from the dock or refueling ship is refueled into the methanol storage tank 1 through the methanol refueling station 9 and the methanol refueling double-walled pipe 7.

[0034] The methanol refueling station 9 is equipped with a double-walled methanol vapor recovery pipe 8, which recovers the methanol vapor to the dock or refueling ship when refueling methanol fuel.

[0035] The top of the methanol storage tank 1 is equipped with a fuel tank connection point 4. External pipe connections and monitoring instruments are installed inside the fuel tank connection point 4. The methanol refueling pipe 7 and the methanol vapor recovery pipe 8 are connected to the methanol storage tank 1 via the fuel tank connection point 4.

[0036] Each compartment of the methanol storage tank 1 is equipped with a vent pipe 31. The independent vent pipes 31 on the port side are combined into a main vent pipe 32 for the methanol storage tank, and the same applies to the starboard side. This main vent pipe 32 is connected to a methanol storage tank vent valve 33. The vent valve 33 is a PV valve, i.e., a high-speed vent valve. This vent valve can ensure that the pressure inside the methanol storage tank is within a set positive and negative pressure range.

[0037] The methanol storage tank vent valve 33 is located in the mud section area of ​​the main deck. The methanol storage tank vent valves 33 on the port and starboard sides are located on the port and starboard sides of the main deck, respectively. The straight-line distance between the outlet of the vent valve 33 and the air inlet or opening of the living, service and machinery spaces and the source of ignition is not less than 10m.

[0038] The first internal deck 13 above the engine room 17 is equipped with a methanol fuel preparation room 3, a methanol day use room 2 and a methanol release room 39.

[0039] The methanol day use tank 2 and the methanol release tank 39 are located inside the methanol fuel preparation room 3.

[0040] The methanol fuel preparation room 3 is equipped with an isolated air chamber 10. Entry to the methanol fuel preparation room 3 is through the airlock area 25.

[0041] The methanol daily use tank 2 is connected to a vent valve 36; the vent valve 36 and the methanol daily use tank 2 are connected via a methanol daily use tank vent pipe 35. The methanol daily use tank vent valve 36 is a PV valve, i.e., a high-speed vent valve. The methanol daily use tank can ensure that the pressure inside the methanol fuel daily use tank is within the set positive and negative pressure range.

[0042] The methanol day tank vent valve 36 is located on the port side at the forward end of the superstructure on the main deck. The outlet of the methanol day tank vent valve 36 shall be at least 10m away from the air inlet or opening of the living, service and machinery spaces and the source of ignition.

[0043] The methanol venting chamber 39 is connected to a vent valve 38; the vent valve 38 and the methanol venting chamber 39 are connected via a methanol venting pipe 37. The methanol venting chamber vent valve 38 is a PV valve, i.e., a high-speed vent valve. The methanol daily use chamber can ensure that the pressure inside the methanol fuel venting chamber is within the set positive and negative pressure range.

[0044] The methanol vent valve 38 is located on the port side of the main deck superstructure. The outlet of the methanol vent valve 38 shall be at least 10m away from the air inlet or opening of the living, service and machinery spaces and the source of ignition.

[0045] The methanol storage tank 1, methanol daily use tank 2, and methanol release tank 39 are all equipped with pressure sensors 41 and connected to the alarm system as redundancy of the controlled venting system to release any possible overpressure and vacuum.

[0046] A methanol transfer pipe 5 for transporting methanol fuel is provided between the methanol storage tank 1 and the methanol day use tank 2. The methanol transfer pipe 5 is located in the side passage 30 on the first inner deck 13 between the side bulkhead 34 of the mud tank and the outer plating of the ship. A methanol transfer pump 6 is provided in the methanol storage tank 1, and the methanol transfer pump 6 transports the methanol fuel in the methanol storage tank 1 to the methanol day use tank 2 through the methanol transfer pipe 5.

[0047] The methanol fuel preparation room 3 is equipped with a methanol fuel supply unit, which is connected to the methanol day use compartment 2. The methanol fuel supply unit can be the main engine methanol fuel supply unit 18, the generator set methanol fuel supply unit 19, or the boiler methanol fuel supply unit 20.

[0048] The engine room 17 is equipped with a methanol dual-fuel main engine 22 connected to the main engine methanol fuel supply unit, or a methanol dual-fuel generator 23 connected to the generator set methanol fuel supply unit, or a methanol dual-fuel boiler 24 connected to the boiler methanol fuel supply unit.

[0049] The engine room 17 may contain only one, two, or three of the following: methanol dual-fuel main engine 22, methanol dual-fuel generator set 23, and methanol dual-fuel boiler 24.

[0050] The methanol fuel supply unit supplies methanol fuel to the methanol dual-fuel main engine 22, the methanol dual-fuel generator set 23, and the methanol dual-fuel boiler 24 via methanol fuel supply pipeline 21. The methanol fuel supply pipeline 21, which passes through the engine room and other safety areas, is a double-walled pipe.

[0051] The methanol fuel preparation room 3 is equipped with a methanol release tank discharge pump 40, which can pump the bilge water from the sewage well of the methanol fuel preparation room 3 to the methanol release tank 39, and can also discharge methanol from the methanol release tank 39 to the shore.

[0052] The main deck 12 is equipped with a methanol fuel supply auxiliary equipment room 26. The methanol fuel supply auxiliary equipment room 26 is equipped with a water-ethylene glycol heat exchanger 27 and a circulation pump 28 for heating or cooling the methanol in the methanol fuel supply unit.

[0053] The methanol fuel supply auxiliary equipment room 26 is also equipped with a nitrogen generator unit 29 for replenishing and inerting the methanol storage tank, methanol daily use tank and methanol discharge tank, as well as providing nitrogen for purging the methanol pipeline.

[0054] In addition, the related systems for dual methanol fuel also include auxiliary systems such as ventilation systems, fire protection systems, methanol fuel leak detection systems, and ship-to-shore connection systems for methanol fuel refueling.

[0055] In this invention, the methanol storage tanks are located in the empty tanks on both sides of the dredging tank, effectively utilizing the space of the buoyancy side tanks. The methanol fuel preparation room and methanol day use tank are arranged above the engine room, effectively utilizing the internal space and reducing the deck area occupied. The methanol fuel refueling station is located on both sides of the ship near the stern area, facilitating the berthing of the methanol refueling vessel and staggering the dredging equipment area.

[0056] This invention provides a solution for the arrangement of methanol power systems on dual-fuel trailing suction hopper dredgers without changing the overall layout and function of the vessel, and provides guidance for the design of new trailing suction hopper dredgers or the retrofitting of existing dredgers.

[0057] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An arrangement structure for a methanol power system of a dual-fuel trailing suction hopper dredger, comprising a methanol storage tank, characterized in that: The methanol storage tank is located within the buoyancy sides of the mud tank. The methanol storage tank is isolated from other compartments by isolation compartments at its front, rear, and top. The outer portion of the methanol storage tank below the light load waterline extends directly to the outer plating, while the portion above the light load waterline is separated from the outer plating by an isolation compartment. A methanol fuel preparation room is located on the first inner deck above the engine room, containing a methanol day tank and a methanol venting tank. A methanol delivery pipe for transporting methanol fuel is located between the methanol storage tank and the methanol day tank. The methanol delivery pipe is located in the empty compartment between the second inner deck and the first inner deck outside the mud tank. The methanol storage tank is connected to a first vent valve, located in the open deck area of ​​the main deck; the methanol day use tank is connected to a second vent valve, also located in the open deck area of ​​the main deck; the methanol venting tank is connected to a third vent valve, also located in the open deck area of ​​the main deck; the methanol fuel preparation room is equipped with a methanol venting tank discharge pump to safely transport contaminated liquid fuel to the shore receiving device; the methanol fuel preparation room is equipped with a methanol fuel supply unit, which is connected to the methanol day use tank; the engine room is equipped with a methanol dual-fuel boiler connected to the methanol fuel supply unit, or a methanol dual-fuel generator set connected to the methanol fuel supply unit, or a methanol dual-fuel main engine connected to the methanol fuel supply unit.

2. The arrangement structure of the methanol power system for the dual-fuel trailing suction hopper dredger according to claim 1, characterized in that: The methanol storage tank is located in the buoyancy tank outside the mud tank, without changing the characteristic structure of the dredger.

3. The arrangement structure of the methanol power system for the dual-fuel trailing suction hopper dredger according to claim 1, characterized in that: The top of the methanol storage tank is equipped with a fuel tank connection point; the methanol storage tank is equipped with a transfer pump to transfer the fuel in the methanol fuel storage tank to the methanol day use tank.

4. The arrangement structure of the methanol power system for a dual-fuel trailing suction hopper dredger according to claim 1, characterized in that: The exterior of the methanol fuel preparation room is equipped with an isolated empty compartment.

5. The arrangement structure of the methanol power system for a dual-fuel trailing suction hopper dredger according to claim 1, characterized in that: The methanol storage tank, methanol daily use tank, and methanol release tank are all equipped with pressure sensors and connected to the alarm system as redundancy of the controlled venting system to release any possible overpressure and vacuum.

6. The arrangement structure of the methanol power system for a dual-fuel trailing suction hopper dredger according to claim 1, characterized in that: The main deck is equipped with a methanol fuel supply auxiliary equipment room, which contains a water-ethylene glycol heat exchanger and a circulating pump set for heating or cooling the methanol in the methanol fuel supply unit. The methanol fuel supply auxiliary equipment room also contains a nitrogen generator unit for replenishing and inerting the methanol storage tank, methanol day tank and methanol venting tank and for purging the methanol pipeline.

7. The arrangement structure of the methanol power system for a dual-fuel trailing suction hopper dredger according to claim 1, characterized in that: There are two methanol refueling stations on the main deck, located near the port and starboard sides respectively; each station has a fuel filling port and an evaporative gas return port.

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