WO2021189986A1

WO2021189986A1 - Dual-fuel bulk cargo ship

Info

Publication number: WO2021189986A1
Application number: PCT/CN2020/136476
Authority: WO
Inventors: 王怡; 陈刚; 王�琦; 李欣; 罗小林; 徐智言; 周熲; 郭世玺; 严先锐; 卢华
Original assignee: 上海外高桥造船有限公司
Priority date: 2020-03-27
Filing date: 2020-12-15
Publication date: 2021-09-30
Also published as: CN111422300A; CN111422300B; KR20220157928A; JP2023518629A

Abstract

A dual-fuel bulk cargo ship, comprising a dual-fuel bulk cargo ship gas supply system. A main deck (26) of the dual-fuel bulk cargo ship comprises a cargo hold area (29) and a stern area (30), wherein the stern area (30) comprises extension areas (301), the extension areas (301) are located on two sides of a stern and extend in a direction away from a midship, and a superstructure (25) is arranged on a side of the stern area (30) that is close to the cargo hold area (29). The dual-fuel bulk cargo ship gas supply system comprises: LNG fuel tanks (1a, 1b), the LNG fuel tanks (1a, 1b) being arranged above the open stern area (30) and located on the left side and the right side of the superstructure (25); a engine room arranged below the main deck (26); and a gas treatment room (3), the gas treatment room (3) being arranged above the open stern area (30) and located between the two LNG fuel tanks (1a, 1b). Fuel in the LNG fuel tanks (1a, 1b) is conveyed to the gas treatment room (3) for treatment and then is conveyed to a gas-operated apparatus inside the engine room.

Description

A dual-fuel bulk carrier

This application claims the priority of Chinese patent application CN2020102308309 whose filing date is March 27, 2020. This application quotes the full text of the aforementioned Chinese patent application.

Technical field

The invention relates to a dual-fuel bulk carrier.

Background technique

Dual-fuel bulk carriers can be applied to different routes. The gas supply system of a dual-fuel bulk carrier generally has an LNG fuel tank, an engine room and a gas processing room. The LNG fuel tank is a pressure storage tank used to store LNG and is used for dual fuel on board The gas equipment provides gas fuel. LNG is stored in the tank in liquid form. The temperature when LNG is in liquid state under normal pressure is about -163°C.

The arrangement of LNG fuel tanks on the ship should first consider safety, and should meet the IGF's requirements for the location of LNG fuel storage tanks, and ensure that the distance between the LNG fuel tanks and the side and bottom of the ship meets the requirements, so that the LNG fuel tanks may collide or collide on the ship. The probability of damage after grounding is reduced to a minimum; at the same time, comprehensive consideration is given to the effect of LNG fuel tanks on ship stability, fire separation and hazardous area division, and the convenience of LNG pipeline layout.

The volume of LNG fuel tanks is large, the LNG fuel gas supply system is complicated, and the layout is difficult. In addition, for bulk carriers in the prior art, the cargo area on the main deck has cargo hatch covers, which makes LNG fuel tanks unable to be placed on the main deck. Cargo area.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the disadvantages of large volume of LNG fuel tanks in the prior art, complex LNG fuel gas supply system, difficult layout, and difficulty in rationally arranging LNG fuel tanks on the main deck, and provide a dual fuel tank cargo ship.

The present invention solves the above technical problems through the following technical solutions:

A dual-fuel bulk carrier includes a dual-fuel bulk carrier gas supply system, characterized in that the main deck of the dual-fuel bulk carrier includes a cargo area and a stern area, and the stern area includes an extended area. The extension area is located on both sides of the stern and extends in a direction away from the midship, a superstructure is provided on the side of the stern area close to the cargo area, and the gas supply system of the dual-fuel bulk carrier includes:

LNG fuel tanks, where the LNG fuel tanks are arranged above the open stern area and located on the left and right sides of the superstructure;

The engine room, the engine room is arranged below the main deck;

Gas treatment room, the gas treatment room is arranged above the open stern area and located between the two LNG fuel tanks, wherein the fuel in the LNG fuel tank is transported to the gas treatment room It is processed and transported to the gas equipment in the engine room.

In this solution, by setting the extension area on the main deck, the LNG fuel tank can be placed on the main deck, so that the LNG fuel tank has sufficient natural ventilation, so that there is no need to set up additional fire detectors and gas detectors around the LNG fuel tank. As well as ventilation; because the LNG fuel tank is arranged in the stern area, it does not occupy the space of the cargo hold area and the engine room, which has little impact on the main dimensions of the ship and the integrity of the hull structure, and meets the requirements of the operator's line of sight when the ship is sailing. In addition, it is not necessary to set up a fuel tank joint space on the tank to meet the requirements of the IGF specification.

Preferably, the width of the superstructure shrinks in the midship direction to accommodate the LNG fuel tank.

In this solution, the width of the superstructure shrinks in the midship direction, which can allow more spaces on both sides of the superstructure to place LNG fuel tanks.

Preferably, the width of the stern area remains unchanged along the length of the ship to form a full-width stern deck.

In this solution, by setting the width of the stern area to remain constant along the length of the ship, that is, setting the stern area as a rectangle, the area of the stern area is increased, and the rectangular stern area has a simple structure and is convenient for processing .

Preferably, the design pressure of the LNG fuel tank ranges from 4 barg to 7 barg.

Preferably, an air dome is provided above the LNG fuel tank, and a maintenance operation platform is arranged above the air dome.

In this solution, the maintenance operation platform is used for arranging a crane to lift the LNG delivery pump installed in the LNG fuel tank.

Preferably, the gas supply system of the dual-fuel bulk carrier includes an LNG bunkering station, and the LNG bunkering station is arranged on the starboard and starboard sides of the cargo area.

In this scheme, locating the LNG bunkering stations on the starboard and starboard sides of the cargo area can improve the flexibility of bulk carriers for LNG bunkering, and satisfy that the ship can be refueled on both starboard and starboard sides under different working conditions. .

Preferably, the dual-fuel bulk carrier gas supply system further includes a manual crane, and the operating range of the manual crane covers the LNG filling station.

In this scheme, the manual crane is used to lift the LNG filling hose in the LNG filling station.

Preferably, the LNG filling station is equipped with a fixed dry powder fire extinguishing system.

Preferably, a drip pan is provided under the joint of the LNG filling station.

In this plan, in order to prevent the cryogenic liquid and cryogenic pipelines from contacting the hull during the filling process, a collector made of low-temperature resistant stainless steel should be installed under the joints of the LNG filling station and under any possible leak locations. Liquid pan, so that in the event of a fuel leak, the surrounding hull or deck structure will not suffer unacceptable cooling.

Preferably, the LNG filling station, the LNG fuel tank and the gas treatment room are connected by a low-temperature LNG pipe, and a steel protective cover is provided above the low-temperature LNG pipe in the cargo tank area or the stern area .

In this scheme, the cryogenic LNG pipe is used to transport cryogenic liquid, and the provision of a steel protective cover can reduce the risk of damaging the cryogenic LNG pipe in the event of an accidental collision of the ship.

Preferably, the gas supply system of the dual-fuel bulk carrier includes an LNG vent mast, and the LNG vent mast is arranged on the port or starboard side of the main deck.

In this scheme, the vent mast is used to discharge the flammable gas from the pressurized system into the atmosphere safely without endangering personnel and equipment.

Preferably, the stern of the third deck of the engine room is provided with a dual fuel generator set and a dual fuel generator set gas valve set; the stern of the second deck of the engine room is provided with a dual fuel steam boiler and a dual fuel steam boiler gas valve set .

Preferably, an LNG delivery pump is arranged in the LNG fuel tank, and the fuel is delivered to the LNG vaporizer through the LNG delivery pump, and then leads to the dual fuel engine after passing through the LNG host buffer tank.

In this scheme, the LNG main engine buffer tank is used to stabilize the gas after LNG gasification.

Preferably, the LNG fuel tank is provided with an LNG delivery pump, and the fuel is delivered to the LNG vaporizer through the LNG delivery pump, passes through the LNG main engine buffer tank, is decompressed by the pressure reducing valve group, and is divided into two paths, all the way to The dual-fuel generator set is used for gas supply, and the other way is used for gas supply to the dual-fuel steam boiler.

In this solution, the pressure reducing valve group is used to reduce the LNG to an appropriate pressure for supply to the dual-fuel generator set and dual-fuel steam boiler.

Preferably, the gas supply system of the dual-fuel bulk carrier further includes a BOG compressor unit, which is arranged in the gas processing room.

In this scheme, the BOG compressor unit is used to compress BOG and output it. LNG is very easy to gasify at room temperature to form BOG. The compressed BOG can be used as fuel, which can not only solve the problems of LNG fuel tank pressure holding time and BOG treatment, but also further save costs and solve the problem of pollution emissions.

Preferably, the boil-off gas in the LNG fuel tank passes through the BOG compressor unit, and then flows to the LNG main engine buffer tank, and supplies gas to the dual-fuel generator set and the dual-fuel steam boiler respectively.

In this solution, BOG is compressed and used as fuel for dual-fuel generator sets and dual-fuel steam boilers.

Preferably, the boil-off gas in the LNG fuel tank passes through the BOG compressor unit, and then leads to the LNG main engine buffer tank, and supplies gas to the dual-fuel main engine, the dual-fuel generator set and the dual-fuel steam boiler respectively.

In this scheme, BOG is compressed and used as fuel for dual-fuel main engine, dual-fuel generator set and dual-fuel steam boiler.

Preferably, the BOG compressor group includes two BOG compressors, and one of the BOG compressors is used for backup.

In this solution, when the pressure of the LNG fuel storage tank is high, two BOG compressors can be started at the same time, so that the pressure in the tank can be quickly and effectively reduced.

Preferably, the engine room is provided with a dual-fuel main engine, and the dual-fuel main engine gas valve group is arranged in the engine room or a fuel processing room.

Preferably, the gas supply system of the dual-fuel bulk carrier includes a medium and low pressure LNG gas supply system, the gas supply pressure of the medium and low pressure LNG gas supply system does not exceed 16 bar gauge, and the dual fuel main engine adopts the Chinese ship Winter The dual-fuel main engine X-DF model of Tour Engine Co., Ltd. The LNG fuel tank includes LNG transfer pumps, and the gas processing room includes LNG vaporizers, low-pressure LNG vaporizers, BOG compressor units, and BOG compressor units for import and export heat exchange It is equipped with a dual-fuel main engine gas valve group and a water-glycol unit.

Preferably, the dual fuel bulk carrier gas supply system includes a high and low pressure LNG gas supply system, the gas supply pressure of the high and low pressure LNG gas supply system does not exceed 300 bar gauge, and the dual fuel main engine adopts Mann's The dual-fuel main engine ME-GI model, the gas processing room includes a high-pressure pump, a high-pressure LNG vaporizer, a low-pressure LNG vaporizer, a BOG compressor unit, the inlet and outlet heat exchangers of the BOG compressor unit, and a dual-fuel main engine gas valve group.

Preferably, the dual-fuel bulk carrier further includes a safety system and an auxiliary system, wherein the safety system includes one of a gas detection system, a fire alarm system, an emergency shutdown system, a fire protection system, a ventilation system, and a venting system. One or more; the auxiliary system includes one or more of a water glycol system, a nitrogen system, and an instrument air system.

In this solution, the installation of a safety system can meet the needs of safety and escape, and the installation of an auxiliary system can make the process flow of the LNG gas supply system more reasonable and smooth.

Preferably, the distance between the LNG fuel tank and the side and the distance between the LNG fuel tank and the bottom shell are calculated by the probability method in the IGF rules.

Preferably, the LNG fuel tank is a piggy-back IMO C-type LNG fuel tank.

On the basis of conforming to common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain preferred embodiments of the present invention.

The positive progress effect of the present invention is that by providing an extension area on the main deck, the LNG fuel tank can be placed on the main deck, so that the LNG fuel tank has sufficient natural ventilation, so that there is no need to install additional fire alarm probes around the LNG fuel tank. Gas detectors and ventilation equipment; because the LNG fuel tank is arranged in the stern area, it does not occupy the space of the cargo hold area and the engine room, and has little impact on the main dimensions of the ship and the integrity of the hull structure. Sight range requirements; in addition, it is not necessary to set up a fuel tank joint space on the tank to meet the IGF specification requirements.

Description of the drawings

Fig. 1 is a schematic diagram of the front structure of a dual-fuel bulk carrier according to a preferred embodiment of the present invention.

Fig. 2 is a left structural schematic diagram of a dual-fuel bulk carrier according to a preferred embodiment of the present invention.

Fig. 3 is a schematic top view of a dual-fuel bulk carrier according to a preferred embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a fuel processing room according to a preferred embodiment of the present invention, in which the gas supply system of the dual-fuel bulk carrier adopts a medium and low pressure LNG gas supply system.

Fig. 5 is another structural schematic diagram of a fuel processing room according to a preferred embodiment of the present invention, wherein the gas supply system of the dual-fuel bulk carrier adopts a high and low pressure LNG gas supply system with an LNG high pressure pump.

Fig. 6 is another structural schematic diagram of a fuel processing room according to a preferred embodiment of the present invention, wherein the gas supply system of a dual-fuel bulk carrier adopts a high and low pressure LNG gas supply system with a pump gasification unit.

Fig. 7 is a schematic diagram showing the comparison between the stern area of the preferred embodiment of the present invention and the stern area of the main deck in the prior art.

Detailed ways

The present invention will be further described by way of examples below, but the present invention is not limited to the scope of the described examples.

The reference signs in Figure 1 to Figure 7 are as follows:

LNG fuel tank 1a, 1b;

gas dome

2a, 2b; fuel processing room 3; LNG breather mast 4; dual fuel main engine 5; dual fuel generator set 6; dual fuel generator set gas valve set 7; dual fuel steam boiler 8; dual Fuel steam boiler gas valve group 9; manual cranes 10a, 10b; LNG filling stations 11a, 11b; LNG fuel tank protective steel 12; high-

pressure pumps

13a, 13b;

escape ports

14a, 14b; pump gasification unit 15; low-pressure gasification Device 16; BOG pre-heater 17;

BOG compressor unit

18a, 18b; main engine buffer tank 19; dual-fuel main engine gas valve group 20; water glycol unit 21; high-pressure vaporizer 22; steering gear room 23; pump gasification Unit hydraulic pump station 24; superstructure 25; main deck 26; second deck 27; third deck 28; cargo area 29; stern area 30; extension area 301; support structure 31; main deck outline 40; conventional main deck outline 41

The following examples further illustrate the present invention, but the present invention is not limited to the scope of the following examples.

As shown in Figures 1, 2, 3 and 7, this embodiment discloses a dual-fuel bulk carrier, including a dual-fuel bulk carrier gas supply system. The main deck 26 of the dual-fuel bulk carrier includes a cargo area 29 and a stern section. Area 30, the stern area 30 includes an extension area 301, which is located on both sides of the stern and extends away from the midship. The stern area 30 is provided with a superstructure 25 on the side close to the cargo hold area 29, with dual fuel dispersion The cargo ship gas supply system includes:

LNG fuel tanks 1a, 1b, LNG fuel tanks 1a, 1b are arranged above the open stern area 30, and are located on the left and right sides of the superstructure 25;

Engine room, the engine room is arranged below the main deck 26;

The gas treatment room is set above the open stern area 30 and is located between the two LNG fuel tanks 1a and 1b. The fuel in the LNG fuel tanks 1a and 1b is transported to the gas treatment room for processing. And delivered to the gas equipment in the engine room.

The LNG fuel tank is a piggy-back LNG fuel tank, using IMO C storage tanks. A stern area 30 is provided on the main deck 26. The LNG fuel tanks 1a and 1b are arranged on the stern area 30 of the open main deck. The arrangement of cargo oil loading and unloading stations, related cargo oil pipes and cable areas on the deck, combined with the requirements for the operating sight range of the bridge personnel when the ship is sailing. There is no need to install an airtight fuel tank connection space on the tank to meet the requirements of the IGF specification; the LNG fuel tanks 1a, 1b have sufficient natural ventilation in the stern area 30, so that the LNG fuel tanks 1a, 1b have sufficient natural ventilation. There is no need to set up fire detectors, gas detectors and ventilation around; the arrangement of LNG fuel tanks 1a and 1b does not occupy the space of the cargo hold area 29 and the engine room, which has little impact on the main dimensions of the ship and the integrity of the hull structure, and ensures the cargo loading It does not affect the main equipment in the engine room and the layout of the cabin under the premise of the quantity, and at the same time satisfies the requirements for the operating sight range of the bridge personnel when the ship is sailing.

It should be noted that the tank can also be provided with a fuel tank joint space to limit the extension of the dangerous area, protect the equipment from the weather, protect the fuel tank and surrounding equipment, and reduce the time for gas detection.

As shown in Fig. 3, two LNG fuel tanks 1a, 1b are symmetrically arranged on the left and right sides of the superstructure 25 along the length of the ship. The width of the superstructure 25 shrinks in the midship direction to form a narrow superstructure to accommodate the LNG fuel tanks 1a and 1b. Among them, the width of the superstructure 25 shrinks in the midship direction, so that more spaces are reserved on both sides of the superstructure 25 to place the LNG fuel tanks 1a, 1b.

Fig. 7 shows the conventional main deck contour line 41 in the prior art and the main deck contour line 40 in this embodiment. At the same time, it can be understood with reference to Fig. 3 that the width of the stern area 30 remains unchanged along the length of the ship, forming a full-width type Aft deck. Among them, by setting the width of the stern area 30 to remain constant along the length of the ship, that is, setting the stern area 30 to be rectangular, the area of the stern area 30 is increased, and the rectangular stern area 30 has a simple structure and is convenient Processing. More, adjust the height of adjacent decks in the superstructure 25 and add a new deck, so that the height of the entire superstructure 25 is increased accordingly, so that the superstructure 25 has the same cargo load and comfort as the traditional Capesize bulk carrier Spend.

As shown in FIG. 2, a support structure 31 is provided under the extension area 301 to support the extension area 301. Specifically, the support structure 31 may be a ship hull steel structure.

Specifically, the design pressure of the LNG fuel tank ranges from 4 barg to 7 barg. LNG is stored in the tank in liquid form, and the temperature when LNG is liquid under normal pressure is about -163°C. Taking into account the gas supply pressure required by the onboard gas equipment, the maintenance time of the LNG fuel tank pressure specified in the IGF specification, and the manufacturing cost of the fuel storage tank, the design pressure of the LNG fuel tank is usually selected from 4 barg to 7 barg. The maximum allowable set value (MARVs) of the pressure release valve of the LNG fuel storage tank is consistent with the design pressure of the fuel tank.

As shown in Figure 1, there are

gas domes

2a, 2b above the LNG fuel tanks 1a, 1b, and a maintenance operation platform is arranged above the

gas domes

2a, 2b. Among them, the maintenance operation platform can be used for arranging cranes to lift the LNG delivery pumps arranged in the LNG fuel tanks 1a and 1b.

As shown in Fig. 2, LNG fuel tank protective steel 12 is provided above the LNG fuel tanks 1a and 1b. Among them, the monorail crane of the ship passes above the LNG fuel tanks 1a and 1b during operation, and the LNG fuel tank protective steel 12 can avoid accidental damage to the LNG fuel tanks 1a and 1b during the hoisting of the parts by the monorail crane.

As shown in Figs. 1 and 3, the gas supply system of a dual-fuel bulk carrier includes LNG filling stations 11a and 11b, and the LNG filling stations 11a and 11b are arranged on the starboard and starboard sides of the cargo area 29. Among them, locating LNG refueling stations 11a and 11b on both sides of the cargo hold area 29 can improve the flexibility of bulk carrier refueling LNG, and satisfy that the ship can be refueled on both sides of the vessel under different working conditions. The gas supply system of the dual-fuel bulk carrier also includes manual cranes 10a and 10b, and the operating range of the manual cranes 10a and 10b covers the LNG refueling stations 11a and 11b. Among them, the manual cranes 10a and 10b are used to lift the LNG filling hoses in the LNG filling stations 11a and 11b. The LNG filling stations 11a and 11b are equipped with fixed dry powder fire extinguishing systems. The top and left and right sides of the LNG filling stations 11a and 11b are provided with protective steel plates to reduce the risk of damaging the LNG filling stations 11a and 11b and the filling pipelines in the event of accidents during ship loading and unloading. A drip pan is provided under the joints of the LNG filling stations 11a and 11b. In order to prevent the cryogenic liquid and cryogenic pipelines from contacting the hull during the filling process, a drip pan made of low-temperature resistant stainless steel should be installed below the LNG filling joint and any possible leak location, so that in the event of fuel leakage , The surrounding hull or deck structure will not suffer unacceptable cooling. The LNG filling stations 11a, 11b, the LNG fuel tanks 1a, 1b and the gas treatment room are connected by low-temperature LNG pipes, and a steel protective cover is provided above the low-temperature LNG pipes in the cargo tank area 29 or the stern area 30. Among them, the cryogenic LNG pipe is used to transport cryogenic liquid, and the provision of a steel protective cover can reduce the risk of damaging the cryogenic LNG pipe in the event of an accidental collision of a ship. In order to avoid possible low-temperature frostbite caused by LNG fuel leakage and contact with the hull structure, LNG filling stations 11a and 11b need to be equipped with water spray systems to protect any spilled fuel.

As shown in Fig. 1, the gas supply system of a dual-fuel bulk carrier includes an LNG vent mast 4, which is arranged on the port or starboard side of the main deck 26. Among them, the vent mast is used to discharge the flammable gas from the pressurized system into the atmosphere safely without endangering personnel and equipment. The distance between the outlet of the LNG venting mast 4 and the opening of the superstructure 25, the air inlet and outlet of the gas safety premises, and the exhaust gas outlet of the machinery and equipment is greater than 10m, so as to be far away from the residential area and the fresh air outlet of the fan. Specifically, in order to avoid overpressure in LNG fuel storage tanks and LNG pipelines, and protect the safety of fuel tanks and related pipelines, dual-fuel bulk carriers are equipped with venting systems for pressure release of LNG fuel tanks 1a and 1b and emergency natural gas discharge. , The venting system is connected to the LNG venting mast 4.

As shown in Figure 1, the stern part of the third deck 28 of the engine room is provided with a dual fuel generator set 6 and a dual fuel generator set gas valve group 7; the stern part of the second deck 27 of the engine room is provided with a dual fuel steam boiler 8 and dual fuel steam. Boiler gas valve group 9. The engine room is provided with a dual-fuel main engine 5, and the dual-fuel main engine gas valve group 20 is arranged in the engine room or the fuel processing room 3.

In this embodiment, LNG delivery pumps are installed in the LNG fuel tanks 1a and 1b, and the fuel is delivered to the LNG vaporizer through the LNG delivery pump, and then leads to the dual fuel host 5 through the LNG host buffer tank 19. Among them, the LNG main engine buffer tank 19 is used to stabilize the gas after LNG gasification. Specifically, the LNG transfer pump is a submersible LNG transfer pump.

In this embodiment, LNG delivery pumps are installed in the LNG fuel tanks 1a and 1b. The fuel is delivered to the LNG vaporizer through the LNG delivery pump, passes through the LNG main engine buffer tank 19, and is decompressed by the pressure reducing valve group into two paths. , One way supplies gas to the dual-fuel generator set 6 for use, and the other way supplies gas to the dual-fuel steam boiler 8 for use. Among them, the pressure reducing valve group is used to reduce the LNG to an appropriate pressure for supply to the dual-fuel generator set 6 and the dual-fuel steam boiler 8.

In an alternative embodiment, for the paths supplied to the dual-fuel generator set 6 and the dual-fuel steam boiler 8, an auxiliary machine buffer tank can be installed after the pressure reducing valve group, and the fuel is stabilized after the auxiliary machine buffer tank is stabilized. It leads to a dual-fuel generator set 6 and a dual-fuel steam boiler 8.

As shown in Figure 4, the gas supply system of the dual-fuel bulk carrier also includes

BOG compressor units

18a, 18b, which are arranged in the gas treatment room. Among them,

BOG compressor units

18a and 18b are used to compress boil-off gas (BOG) and output. LNG is easily gasified at room temperature to form BOG. The compressed BOG can be used as fuel, which can not only solve LNG fuel tanks 1a and 1b. Holding pressure time and BOG treatment issues can further save costs and solve the problem of pollution emissions.

In this embodiment, the boil-off gas in the LNG fuel tanks 1a, 1b passes through the BOG compressor sets 18a, 18b, and then flows to the LNG main engine buffer tank 19, and is supplied to the dual-fuel generator set 6 and the dual-fuel steam boiler 8 respectively. Among them,

BOG compressor units

18a, 18b use 16 bar gauge pressure gas compressors. The

BOG compressor unit

18a, 18b includes two BOG compressors, one of which is used for backup. When the pressure in the LNG fuel storage tank is high, two BOG compressors can be started at the same time, so that the pressure in the tank can be quickly and effectively reduced.

In other alternative embodiments, the boil-off gas in the LNG fuel tanks 1a, 1b passes through the BOG compressor sets 18a, 18b, and then flows to the LNG main engine buffer tank 19, and then to the dual-fuel main engine 5, the dual-fuel generator set 6 and the LNG main engine buffer tank 19 respectively. The dual-fuel steam boiler 8 is used for gas supply, and the BOG compressor sets 18a and 18b adopt 8 bar gauge pressure gas compressors.

Furthermore, the gas supply system of the dual-fuel bulk carrier may also include a BOG pre-heater 17. The boil-off gas in the LNG fuel tanks 1a, 1b first passes through the BOG pre-heater 17, and then enters the

BOG compressor units

18a, 18b. Since the BOG in the LNG fuel storage tank is spontaneously output through the boil-off gas pipeline on the top of the tank, the BOG temperature and pressure are low at this time and cannot meet the gas conditions. The BOG pre-heater 17 is used to heat the boil-off gas to a suitable temperature. Then go through the BOG compressor at room temperature.

In this embodiment, the gas supply system of the dual-fuel bulk carrier adopts the medium and low pressure LNG gas supply system, the gas supply pressure of the medium and low pressure LNG gas supply system does not exceed 16 bar gauge, and the dual fuel main engine adopts the Sinoship Winterthur engine The company’s dual-fuel main engine X-DF model, LNG fuel tanks 1a, 1b include LNG delivery pumps, and the gas processing room includes LNG vaporizers, low-pressure LNG vaporizers, BOG pre-heaters 17,

BOG compressor units

18a, 18b , The inlet and outlet heat exchangers of the BOG compressor unit, the dual-fuel main engine gas valve group 20 and the water glycol unit 21. The gas treatment room is provided with two

escape ports

14a, 14b, so there is no need to install an air lock in the room.

In other alternative embodiments, the dual-fuel bulk carrier gas supply system can also adopt a high and low pressure LNG gas supply system. As shown in Figure 5, the gas supply pressure of the high and low pressure LNG gas supply system does not exceed 300 bar gauge. The dual-fuel main engine adopts MAN's dual-fuel main engine ME-GI model. The high and low pressure LNG gas supply system has

high pressure pumps

13a, 13b. The gas processing room includes

high pressure pumps

13a, 13b, high pressure LNG vaporizer, and low pressure LNG vaporization. , BOG pre-heater 17,

BOG compressor unit

18a, 18b, BOG compressor unit inlet and outlet heat exchanger and dual-fuel main engine gas valve unit 20.

In other alternative embodiments, the high and low pressure LNG gas supply system can also use a pump gasification unit 15 (PVU) instead of the high pressure pumps 13a and 13b. Vaporizer 16, BOG pre-heater 17,

BOG compressor group

18a, 18b, main engine buffer tank 19, dual-fuel main engine gas valve group 20. The hydraulic pump station 24 of the pump gasification unit is arranged in the steering gear room 23 closer to the gas processing room. The water glycol unit 21 is arranged at the bow of the second deck 27 of the engine room. Among them, the volume of the pump gasification unit 15 is small, which greatly reduces the footprint of the equipment and the weight of the system, and reduces the difficulty of layout. The pump gasification unit 15 has a fast response speed and can better meet the flow and pressure requirements of the high-pressure dual-fuel engine.

In this embodiment, the dual-fuel bulk carrier also includes a safety system and an auxiliary system. The safety system includes one of a gas detection system, a fire alarm system, an emergency shut-off system, a fire protection system, a ventilation system, and a venting system. Or more; auxiliary systems include one or more of water glycol system, nitrogen system and instrument air system. Among them, the installation of a safety system can meet the needs of safety and escape, and the installation of an auxiliary system can make the process flow of the LNG gas supply system more reasonable and smooth.

The distance between the LNG fuel tank and the side and the distance between the LNG fuel tank and the bottom shell are calculated by the probability method in the IGF rules to ensure that the distance between the LNG fuel tank and the side and bottom shell meets the requirements. The probability of damage after the ship has collided or ran aground is minimized. At the same time, comprehensive consideration is given to the influence of LNG fuel storage tanks on ship stability, fire separation and hazardous area division, and the convenience of LNG pipeline arrangement.

In other alternative implementations, the location of the LNG fuel tank can also be determined by using physical protection isolation requirements (determining method) to ensure the distance requirements of the LNG fuel tank from the side and bottom of the ship, and to protect the LNG fuel storage tank in the The probability of damage after a ship collision or grounding is minimized.

Specifically, the dual-fuel bulk carrier has a deadweight of 80,000 to 300,000 tons, and the material of the LNG fuel tank is 9 nickel steel or 304 stainless steel low temperature resistant material, preferably 9 nickel steel, to meet the requirement of storing LNG in a low temperature state. In addition, the surface of the LNG fuel tank is provided with a layer of insulating material, and the insulating material is made of polyurethane foam or polystyrene foam, preferably polyurethane foam, so as to prevent the excessive introduction of external heat and cause the LNG liquid in the tank to continuously evaporate.

With the application of the present invention, a dual-fuel bulk carrier solution powered by LNG and oil can directly meet the latest NOx Tier III and SOx 2020 environmental protection requirements, and meet the requirements of the third stage of EEDI in 2025. Energy saving, environmental protection, and economy are both Reaching the international advanced level, the LNG gas supply system can choose the medium and low pressure gas supply system or the high and low pressure gas supply system. According to the different needs of the gas equipment, it can provide fuel gas of different pressures and temperatures for the dual-fuel engine and dual-fuel steam boiler. Cargo ships mainly cover medium and long voyage bulk carriers from 80,000 dwt to 300,000 dwt.

Taking the 210,000-ton Newcastle-type dual-fuel bulk carrier as an application example, two IMO C-type LNG fuel storage tanks with the same capacity are installed on the ship according to the operating distance of the ship. The volume of each LNG fuel tank is about 3000m ³ ～3500m ³ , It can meet the requirement of LNG as the power fuel for the ship's full voyage, and there is no need to refuel LNG on the way.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is only an example, and the protection scope 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 principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

A dual-fuel bulk carrier includes a gas supply system for a dual-fuel bulk carrier, wherein the main deck of the dual-fuel bulk carrier includes a cargo area and a stern area, and the stern area includes an extended area. The extension area is located on both sides of the stern and extends in a direction away from the midship, a superstructure is provided on the side of the stern area close to the cargo area, and the gas supply system of the dual-fuel bulk carrier includes:

LNG fuel tanks, where the LNG fuel tanks are arranged above the open stern area and located on the left and right sides of the superstructure;

The engine room, the engine room is arranged below the main deck;

Gas treatment room, the gas treatment room is arranged above the open stern area and located between the two LNG fuel tanks, wherein the fuel in the LNG fuel tank is transported to the gas treatment room It is processed and transported to the gas equipment in the engine room.
The dual-fuel bulk carrier according to claim 1, wherein the width of the superstructure shrinks in the midship direction to accommodate the LNG fuel tank.
The dual-fuel bulk carrier according to claim 1 or 2, wherein the width of the stern area remains unchanged along the length of the ship, forming a full-width stern deck.
The dual-fuel bulk carrier according to at least one of claims 1 to 3, wherein the design pressure of the LNG fuel tank ranges from 4 barg to 7 barg.
The dual-fuel bulk carrier according to at least one of claims 1 to 4, wherein an air dome is provided above the LNG fuel tank, and a maintenance operation platform is arranged above the air dome.
The dual-fuel bulk carrier according to at least one of claims 1-5, wherein the gas supply system of the dual-fuel bulk carrier comprises an LNG filling station, and the LNG filling station is arranged in the The port and starboard sides of the cargo area.
The dual-fuel bulk carrier of claim 6, wherein the gas supply system of the dual-fuel bulk carrier further comprises a manual crane, and the operating range of the manual crane covers the LNG filling station.
The dual-fuel bulk carrier according to claim 6 or 7, wherein the LNG filling station is equipped with a fixed dry powder fire extinguishing system.
The dual-fuel bulk carrier according to at least one of claims 6-8, wherein a liquid collecting pan is provided under the joint of the LNG filling station.
The dual-fuel bulk carrier according to at least one of claims 6-9, wherein the LNG bunkering station, the LNG fuel tank and the gas treatment room are connected by a low-temperature LNG pipe and are located in the A steel protective cover is provided above the low-temperature LNG pipe in the cargo tank area or the stern area.
The dual-fuel bulk carrier according to at least one of claims 1-10, wherein the gas supply system of the dual-fuel bulk carrier comprises an LNG vent mast, and the LNG vent mast is arranged on the main deck. The port or starboard side.
The dual-fuel bulk carrier according to at least one of claims 1-11, wherein the stern part of the third deck of the engine room is provided with a dual-fuel generator set and a dual-fuel generator set gas valve set; The stern part of the second deck of the engine room is equipped with a dual-fuel steam boiler and a dual-fuel steam boiler gas valve group.
The dual-fuel bulk carrier according to at least one of claims 1-12, wherein an LNG delivery pump is provided in the LNG fuel tank, and fuel is delivered to the LNG vaporizer through the LNG delivery pump, After passing the LNG main engine buffer tank, it leads to the dual fuel main engine.
The dual-fuel bulk carrier according to at least one of claims 1-13, wherein an LNG delivery pump is provided in the LNG fuel tank, and fuel is delivered to the LNG vaporizer through the LNG delivery pump, The buffer tank of the LNG main engine is divided into two circuits after being decompressed by the pressure reducing valve group, one is for supplying gas to the dual-fuel generator set, and the other is for supplying gas to the dual-fuel steam boiler.
The dual-fuel bulk carrier according to at least one of claims 1-14, wherein the gas supply system of the dual-fuel bulk carrier further comprises a BOG compressor unit, and the BOG compressor unit is arranged on the gas In the processing room;

Preferably, after the boil-off gas in the LNG fuel tank passes through the BOG compressor unit, it leads to a buffer tank of the LNG main engine, and supplies gas to a dual-fuel generator set and a dual-fuel steam boiler respectively;

Preferably, after the boil-off gas in the LNG fuel tank passes through the BOG compressor unit, it leads to the LNG main engine buffer tank, and supplies gas to the dual-fuel main engine, the dual-fuel generator set and the dual-fuel steam boiler respectively.
The dual-fuel bulk carrier according to claim 15, wherein the BOG compressor unit includes two BOG compressors, and one of the BOG compressors is used for backup.
The dual-fuel bulk carrier according to claims 1-16, wherein the engine room is provided with a dual-fuel main engine, and the dual-fuel main engine gas valve group is arranged in the engine room or the gas treatment room.
The dual-fuel bulk carrier of claim 17, wherein the gas supply system of the dual-fuel bulk carrier comprises a medium and low pressure LNG gas supply system, and the gas supply pressure of the medium and low pressure LNG gas supply system does not exceed 16 Bar gauge pressure, the dual-fuel main engine adopts the dual-fuel main engine X-DF model of CSSC Winterthur Engine Co., Ltd., the LNG fuel tank includes an LNG transfer pump, and the gas treatment room includes an LNG vaporizer, Low-pressure LNG vaporizer, BOG compressor, BOG compressor inlet and outlet heat exchanger, dual-fuel main engine gas valve group and water glycol unit.
The dual-fuel bulk carrier according to claim 17, wherein the gas supply system of the dual-fuel bulk carrier comprises a high and low pressure LNG gas supply system, and the gas supply pressure of the high and low pressure LNG gas supply system does not exceed 300 Bar gauge pressure, the dual-fuel main engine adopts MAN's dual-fuel main engine ME-GI model, and the gas processing room includes a high-pressure pump, a high-pressure LNG vaporizer, a low-pressure LNG vaporizer, a BOG compressor, and the The inlet and outlet heat exchangers of the BOG compressor and the dual-fuel main engine gas valve group.
The dual-fuel bulk carrier according to at least one of claims 1-19, wherein the dual-fuel bulk carrier further includes a safety system and an auxiliary system, wherein the safety system includes a gas detection system, One or more of fire alarm system, emergency shut-off system, fire protection system, ventilation system and ventilation and relief system; the auxiliary system includes one or more of water glycol system, nitrogen system and instrument air system ；

Preferably, the distance between the LNG fuel tank and the side and the distance between the LNG fuel tank and the bottom shell are calculated by the probability method in the IGF rules;

Preferably, the LNG fuel tank is a piggy-back IMO C-type LNG fuel tank.