CN114962991A - LNG single fuel gas supply system - Google Patents

Abstract

The invention discloses an LNG single-fuel gas supply system, and belongs to the technical field of ship natural gas supply systems. The utility model provides a single fuel gas supply system of LNG, gas supply system is including port bunker joint department, starboard bunker joint department, first gasification heating system, second gasification heating system, LNG storage tank, instrument system, safety valve group and filling station, be provided with sewage pipes around gas supply system's the outside, gas supply system still includes two pure LNG gas engine and pure LNG gas generating set. In order to solve the problems of disordered pipeline positions, poor applicability, inconvenience in pipeline pressure adjustment and poor resource utilization rate of ship LNG supply in the prior art, the equipment structure of the gas supply system is reasonable in design, reliable and safe in quality and stable in operation, technical indexes and performance parameters required by a demander are achieved, the normal use of the demander is met, and in order to meet the requirements, a double-wall pipeline structure is adopted, the optimal gas supply effect is achieved, and the requirements of a cabin are met.

Description

LNG single fuel gas supply system

Technical Field

The invention relates to the technical field of natural gas supply systems of ships, in particular to an LNG single-fuel gas supply system.

Background

LNG, i.e., liquefied natural gas, is natural gas that is liquid at normal pressure obtained by purifying natural gas produced in a gas field and then liquefying the natural gas at a series of ultra-low temperatures, and is known as the cleanest fossil energy on earth. The LNG manufacturing process is that natural gas produced in a gas field is purified and is transported by a liquefied natural gas ship after being liquefied at a series of ultralow temperatures. The liquefied natural gas has very little pollution to air after being burnt and releases large heat, so the liquefied natural gas is an advanced energy source. In the world's total energy production, natural gas now accounts for one third, and it is possible to gradually push the now popular oil and coal to a lesser position in the near future.

The LNG is used as clean energy for sustainable development, has obvious environmental benefit and social benefit, can reduce 90 percent of sulfur dioxide emission and 80 percent of nitrogen oxide emission after the LNG replaces fuel oil, has obvious environmental benefit, and is a high-quality substitute fuel for ships.

During the supply of LNG to a ship, the following drawbacks are often present:

1. the pipeline position is chaotic, and the applicability is poor.

2. The pipeline pressure is inconvenient to adjust, and the resource utilization rate is poor.

In view of these drawbacks, it is necessary to design an LNG single fuel gas supply system.

Disclosure of Invention

The invention aims to provide an LNG single-fuel gas supply system which can solve the problems that in the prior art, the position of a pipeline for supplying LNG to a ship is disordered, the applicability is poor, the pipeline pressure is inconvenient to adjust, and the resource utilization rate is poor.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a LNG single fuel gas supply system, includes gas supply system, gas supply system is including port bunker joint department, starboard bunker joint department, first gasification heating system, second gasification heating system, LNG storage tank, instrument system, safety valve group and filling station, be provided with sewage pipes around gas supply system's the outside, gas supply system still includes two pure LNG gas engine and pure LNG gas generating set, first gasification heating system and second gasification heating system all are used for gasifying the LNG fuel, LNG storage tank sets up to vacuum insulation's sealed tank body, gas supply system adopts the double-walled pipeline air feed, the filling station is used for annotating liquefied natural gas to gas supply system, port bunker joint department and starboard bunker joint department all include that hot medium valve, pipe and wall reserve external interface, port bunker joint department and bunker joint department still include nitrogen gas purge pipeline and low temperature valve And a door.

Preferably, the gas supply system is externally provided with a first vent pipe, a first vent outlet pipe, a second vent pipe, a first LNG heating inlet pipe, a first vent inlet pipe, a first LNG heating outlet pipe, a first nitrogen input pipe, a first NG gas supply outlet pipe, a second NG gas supply outlet pipe, a first discharge pipe, a second discharge pipe, a third NG gas supply outlet pipe, a second nitrogen input pipe, a second LNG heating outlet pipe, a second vent inlet pipe and a second LNG heating inlet pipe, the first ventilation outlet pipe and the second ventilation outlet pipe are respectively communicated with ventilation outlets at joint positions of a port fuel bin joint and a starboard fuel bin joint, the first ventilation inlet pipe and the second ventilation inlet pipe are respectively communicated with the ventilation inlets of joint positions of a port fuel bin joint and a starboard fuel bin joint, and the first ventilation outlet pipe, the second ventilation outlet pipe, the first ventilation inlet pipe and the second ventilation inlet pipe are used for replacing the gas in the gas supply system.

Preferably, first gasification heating system includes first gasification heater and first buffer tank, first buffer tank and first gasification heater pass through the gaseous phase pipe intercommunication, and first gasification heater is shell and tube formula, and inside sets up two independent tube passes, and wherein is used as the vaporizer of fuel compartment pressure boost all the way, and another way is used as the evaporation heating of natural gas fuel, just install gaseous phase pipeline between first gasification heater and the first buffer tank and detect the group, first buffer tank passes through gaseous phase pipe and third NG air feed outlet pipe intercommunication, first gasification heater passes through heating medium pipe and second LNG heating outlet pipe intercommunication, just first gasification heater's heating medium sets up to fresh water, second nitrogen input tube passes through the nitrogen gas pipe and communicates with third NG air feed outlet pipe and first buffer tank respectively.

Preferably, second gasification heating system includes second gasification heater and second buffer tank, second gasification heater through heating medium pipe respectively with first LNG heating exit tube and first LNG heating income pipe intercommunication, second gasification heater through gaseous phase pipe and second buffer tank intercommunication, the second buffer tank through gaseous phase pipe respectively with first NG air feed exit tube and second NG air feed exit tube intercommunication, first nitrogen gas input tube through the nitrogen gas pipe respectively with second buffer tank, first NG air feed exit tube and second NG air feed exit tube intercommunication.

Preferably, the LNG storage cabin comprises a fuel cabin vent port, a top spray interface, a gas return outlet, a pressurized gas phase inlet, an upper liquid level meter valve interface, an overflow interface, a lower liquid level meter valve interface, a lower liquid supply outlet, a lower liquid filling port and a spray header, the spray header is positioned in the middle of the interior of the LNG storage cabin, the fuel cabin vent port is communicated with a safety valve group through a safety valve discharge pipe, the top spray interface is respectively communicated with the spray header, a filling station and a second gasification heater through liquid phase pipes, the gas return outlet is communicated with the filling station through a gas phase pipe, the pressurized gas phase inlet is respectively communicated with the first gasification heater and a first buffer tank through a gas phase pipe, the upper liquid level meter valve interface, the overflow interface and the lower liquid level meter valve interface are all communicated with an instrument system through instrument pipelines, and the lower liquid supply outlet is communicated with the first gasification heater through a liquid phase pipe, and the lower filling liquid port is respectively communicated with the filling station and the second gasification heater through liquid phase pipes.

Preferably, the instrumentation system is including first instrument valves, second instrument valves and valves instrument, first instrument valves pass through the instrumentation pipe respectively with second instrument valves and valves instrument intercommunication, the instrumentation system is still including panel board and wireless transmission module.

Preferably, the safety valve group comprises a normally closed safety valve and an emergency remote control valve, the normally closed safety valve is used for releasing the pressure of the pipeline, and the emergency remote control valve is remotely controlled to be opened and closed through an emergency remote control button.

Preferably, the filling station is including third nitrogen gas input tube, third discharge tube, filling water pipe, the liquid feeding mouth of pipe, return-air mouth of pipe, stainless steel collecting tray and water curtain shower nozzle, and third nitrogen gas input tube, third discharge tube and filling water pipe all are located the gas supply system outside, just nitrogen gas system is all inserted to third nitrogen gas input tube, second nitrogen gas input tube and first nitrogen gas input tube, third nitrogen gas input tube communicates with liquid feeding mouth of pipe and return-air mouth of pipe respectively through the nitrogen gas pipe, the third discharge tube is used for collecting the hydrops of stainless steel collecting tray and discharges to the outboard, filling water pipe and water curtain shower nozzle intercommunication, the water curtain shower nozzle is located first LNG and heats the income pipe top.

Compared with the prior art, the invention has the following beneficial effects:

1. the LNG single-fuel gas supply system has the advantages that the equipment structure design of the gas supply system is reasonable, the quality is reliable and safe, the operation is stable, the technical indexes and performance parameters required by a demander are achieved, the normal use of the demander is met, in order to meet the requirements, the double-wall pipeline design is adopted after the gas supply pipeline enters a cabin, the left and right cold boxes respectively provide two gas supply pipelines, the outer pipe is selected after calculation and approval according to the cabin layout and the pipeline trend, the protection requirement is considered when the gas supply pipeline from the cold box to the cabin section is adopted, the double-wall pipeline structure is also adopted, the optimal gas supply effect is achieved, the structure is stable, the long-term work is facilitated, the functionality is wide, the application range is wide, the requirements of the cabin are met, the two groups of independent gasification heating systems with the internal pipe strokes are used for respectively carrying out different work, the first gasification heating system is used as a vaporizer for pressurizing the fuel cabin, the pipeline stability is kept, and the second gasification heating system is used for evaporating natural gas fuel, ensuring the pipeline to work without errors.

2. The LNG single fuel gas supply system keeps air circulation by replacing the ventilation pipelines at the joint of a port fuel bunker and the joint of a starboard fuel bunker, improves the stability of the air pressure of the system and simultaneously improves the safety effect, LNG stored in an LNG storage cabin enters a vaporizer for gasification under the action of the internal pressure of a storage tank per se, enters a host and a generator after entering a host GYU valve unit through a buffer tank and a double-wall pipeline for regulation, has stable structure and convenient pipeline regulation, has definite multi-item work distribution pipelines, is favorable for improving the working quality of the gas supply system and good safety, can detect the working state in the LNG storage cabin through a first instrument valve group, a second instrument valve group and a valve group instrument, converts information to be sent to a gas security management system through a wireless transmission module, monitors and manages in real time on line, facilitates the remote management work, and can remotely control the safety valve group through an emergency remote control valve, and adjusting the safety valve group to protect the pipeline of the air supply system at any time.

Drawings

FIG. 1 is a schematic illustration of a gas supply system of the present invention;

FIG. 2 is a schematic diagram of a first gasification heating system of the present invention;

FIG. 3 is a schematic illustration of a second gasification heating system of the present invention;

FIG. 4 is a schematic illustration of an LNG storage tank of the present invention;

FIG. 5 is a schematic diagram of the instrumentation system of the present invention;

FIG. 6 is a schematic view of the safety valve pack of the present invention;

FIG. 7 is a schematic illustration of a filling station of the present invention;

fig. 8 is a schematic diagram of the piping route of the present invention.

In the figure: 1. an air supply system; 101. a first gas permeable tube; 102. a first vent outlet pipe; 103. a second ventilation outlet pipe; 104. a second gas permeable tube; 105. a first LNG heating inlet pipe; 106. a first ventilation inlet pipe; 107. a first LNG heated exit tube; 108. a first nitrogen gas input pipe; 109. a first NG gas supply outlet pipe; 110. a second NG gas supply outlet pipe; 111. a first discharge pipe; 112. a second discharge pipe; 113. a third NG gas supply pipe; 114. a second nitrogen input pipe; 115. a second LNG heated exit tube; 116. a second ventilation inlet pipe; 117. a second LNG heating inlet pipe; 2. a port bunker junction; 3. starboard bunker junction; 4. a first gasification heating system; 401. a first gasification heater; 402. a first buffer tank; 403. a gas phase pipeline detection group; 5. a second gasification heating system; 501. a second vaporization heater; 502. a second buffer tank; 6. an LNG storage tank; 601. a fuel compartment vent; 602. a top spray interface; 603. a return air outlet; 604. a pressurized gas phase inlet; 605. an upper level gauge valve interface; 606. an overflow interface; 607. a lower level gauge valve interface; 608. a lower liquid supply outlet; 609. a lower liquid injection port; 610. a shower head; 7. an instrumentation system; 701. a first meter valve group; 702. a second meter valve group; 703. a valve group meter; 8. a safety valve bank; 801. a normally closed safety valve; 802. an emergency remote control valve; 9. a filling station; 901. a third nitrogen gas input pipe; 902. a third discharge pipe; 903. filling a water pipe; 904. a liquid adding pipe orifice; 905. a return air pipe orifice; 906. a stainless steel drip pan; 907. a water curtain spray head.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 8, an LNG single fuel gas supply system includes a gas supply system 1, the gas supply system 1 includes a port bunker joint 2, a starboard bunker joint 3, a first gasification heating system 4, a second gasification heating system 5, an LNG storage tank 6, an instrument system 7, a safety valve group 8 and a filling station 9, a sewage pipeline is disposed around the outside of the gas supply system 1, the gas supply system 1 further includes two pure LNG gas engines and pure LNG gas generator sets, the first gasification heating system 4 and the second gasification heating system 5 are both used for gasifying LNG fuel, the LNG storage tank 6 is a vacuum heat-insulated sealed tank, the gas supply system 1 has a reasonable design of equipment structure, reliable and safe quality, stable operation, meets technical indexes and performance parameters required by a demander, and meets normal use of the demander, the gas supply system 1 adopts a double-wall pipeline for gas supply, in order to meet the requirements, the air supply pipeline enters the cabin and is designed by adopting a double-wall pipeline, a left cold box and a right cold box respectively provide two air supply pipelines, an outer pipe calculates and approves according to the layout and the pipeline trend of the cabin and selects the type, the air supply pipeline from the cold box to the cabin section considers the protection requirement, the double-wall pipeline structure is also adopted, the optimal air supply effect is achieved, the structure is stable, the long-term work is facilitated, the functionality is wide, the application range is large, and the requirements of the cabin are met, a filling station 9 is used for filling liquefied natural gas into the air supply system 1, a port fuel cabin joint position 2 and a starboard fuel cabin joint position 3 both comprise a heat medium valve, a pipe and a wall reserved external interface, temperature sensors can be arranged at the high-temperature side outlets of gasified gas at the port fuel bin joint 2 and the starboard fuel bin joint 3 to prevent icing caused by too low temperature of heating medium, and the port fuel bin joint 2 and the starboard fuel bin joint 3 also comprise nitrogen purging pipelines and low-temperature valves.

Further, the outside of the gas supply system 1 is provided with a first vent pipe 101, a first vent outlet pipe 102, a second vent outlet pipe 103, a second vent pipe 104, a first LNG heating inlet pipe 105, a first vent inlet pipe 106, a first LNG heating outlet pipe 107, a first nitrogen input pipe 108, a first NG gas supply outlet pipe 109, a second NG gas supply outlet pipe 110, a first bleeder pipe 111, a second bleeder pipe 112, a third NG gas supply outlet pipe 113, a second nitrogen input pipe 114, a second LNG heating outlet pipe 115, a second vent inlet pipe 116, and a second LNG heating inlet pipe 117, the first vent outlet pipe 102 and the second vent outlet pipe 103 are respectively communicated with vent outlets at joints of the port bunker joint 2 and the starboard bunker joint 3, the first vent inlet pipe 106 and the second vent inlet pipe 116 are respectively communicated with vent inlets at joints of the port bunker joint 2 and the starboard bunker joint 3, the first ventilation outlet pipe 102, the second ventilation outlet pipe 103, the first ventilation inlet pipe 106 and the second ventilation inlet pipe 116 replace the gas in the gas supply system 1, and the ventilation pipelines at the port fuel bin joint 2 and the starboard fuel bin joint 3 are replaced to keep the air circulation, so that the stability of the air pressure of the system is improved, and the safety effect is improved.

Referring to fig. 2, the first gasification heating system 4 includes a first gasification heater 401 and a first buffer tank 402, the first buffer tank 402 is communicated with the first gasification heater 401 through a gas phase pipe, the first gasification heater 401 is of a shell-and-tube type, and two independent pipe passes are arranged inside, one of the two independent pipe passes is used as a vaporizer for pressurizing a fuel tank, the other is used for evaporating and heating natural gas fuel, the first buffer tank 402 can be adjusted according to the intake pressure of the engine and the supply pressure after gasification, the storage tank is pressurized by a pressurization unit when the storage tank pressure is lower than the supply pressure, when the storage tank pressure is higher than the set supply pressure, the gas phase NG in the gas phase space inside the storage tank can be preferentially utilized, so as to reduce the storage tank pressure and process BOG gas, and a gas phase pipe detection group 403 is installed between the first gasification heater 401 and the first buffer tank 402, the first buffer tank 402 is communicated with a third NG supply pipe 113 through a gas phase pipe, the first gasification heater 401 is communicated with the second LNG heating outlet pipe 115 through a heating medium pipe, the heating medium of the first gasification heater 401 is set to be fresh water, the outlets of a cold side and a hot side are respectively provided with a temperature sensor to ensure that the pipeline is free from freezing, the second nitrogen input pipe 114 is respectively communicated with the third NG gas supply outlet pipe 113 and the first buffer tank 402 through a nitrogen pipe, the gas pressure condition between the first gasification heater 401 and the first buffer tank 402 is detected through a gas phase pipeline detection group 403, the safety is improved, and the first gasification heating system 4 is used as a vaporizer for pressurizing a fuel tank to keep the stability of the pipeline.

Referring to fig. 3, the second gasification heating system 5 includes a second gasification heater 501 and a second buffer tank 502, the second gasification heater 501 is respectively communicated with the first LNG heating outlet pipe 107 and the first LNG heating inlet pipe 105 through a heating medium pipe, the second gasification heater 501 is communicated with the second buffer tank 502 through a gas phase pipe, the second buffer tank 502 is respectively communicated with the first NG gas supply outlet pipe 109 and the second NG gas supply outlet pipe 110 through a gas phase pipe, the first nitrogen input pipe 108 is respectively communicated with the second buffer tank 502, the first NG gas supply outlet pipe 109 and the second NG gas supply outlet pipe 110 through a nitrogen gas pipe, different operations are respectively performed through two independent sets of gasification heating systems of the internal pipe, and the second gasification heating system 5 is used for natural gas fuel evaporation to ensure that the pipeline works correctly.

Referring to fig. 4, the LNG storage tank 6 includes a tank vent 601, a top spray interface 602, a return air outlet 603, a pressurized gas phase inlet 604, an upper level meter valve interface 605, an overflow interface 606, a lower level meter valve interface 607, a lower liquid supply outlet 608, a lower liquid filling port 609 and a spray header 610, the spray header 610 is located in the middle of the inside of the LNG storage tank 6, the tank vent 601 is communicated with the safety valve group 8 through a safety valve discharge pipe, the top spray interface 602 is respectively communicated with the spray header 610, the filling station 9 and the second gasification heater 501 through liquid phase pipes, the return air outlet 603 is communicated with the filling station 9 through gas phase pipes, the pressurized gas phase inlet 604 is respectively communicated with the first gasification heater 401 and the first buffer tank 402 through gas phase pipes, the upper level meter valve interface 605, the overflow interface 606 and the lower level meter valve interface 607 are all communicated with the meter system 7 through meter pipes, the lower liquid supply outlet 608 is communicated with the first gasification heater 401 through liquid phase pipes, the lower liquid filling port 609 is respectively communicated with the filling station 9 and the second gasification heater 501 through a liquid phase pipe, LNG stored in the LNG storage cabin 6 is input into the vaporizer to be gasified under the action of the internal pressure of the storage tank, and then enters the host and the generator after entering the host GVA valve unit through the buffer tank and being regulated by the double-wall pipeline, so that the structure is stable, the pipeline adjustment is convenient, multiple work division pipelines are clear, the working quality of the gas supply system 1 is improved, and the safety is good.

Referring to fig. 5, the instrument system 7 includes a first instrument valve group 701, a second instrument valve group 702, and a valve group instrument 703, the first instrument valve group 701 is respectively communicated with the second instrument valve group 702 and the valve group instrument 703 through an instrument tube, the instrument system 7 further includes an instrument panel and a wireless transmission module, the operating state inside the LNG storage tank 6 can be detected through the first instrument valve group 701, the second instrument valve group 702, and the valve group instrument 703, information is converted and sent to the gas security management system through the wireless transmission module, and real-time online monitoring management and remote management work are facilitated.

Referring to fig. 6, the safety valve group 8 includes a normally closed safety valve 801 and an emergency remote control valve 802, the normally closed safety valve 801 is used for releasing the pressure of the pipeline, the emergency remote control valve 802 is remotely controlled to open and close by an emergency remote control button, and the safety valve group 8 can be remotely operated and adjusted by the emergency remote control valve 802, so as to protect the pipeline of the gas supply system 1 at any time.

Referring to fig. 7, the filling station 9 includes a third nitrogen input pipe 901, a third discharge pipe 902, a filling water pipe 903, a filling nozzle 904, a return nozzle 905, a stainless steel pan 906 and a water curtain nozzle 907, the third nitrogen input pipe 901, the third discharge pipe 902 and the filling water pipe 903 are all located outside the gas supply system 1, the third nitrogen input pipe 901, the second nitrogen input pipe 114 and the first nitrogen input pipe 108 are all connected to the nitrogen system, the third nitrogen input pipe 901 is respectively communicated with the filling nozzle 904 and the return nozzle 905 through the nitrogen pipe, the third discharge pipe 902 is used for collecting the accumulated liquid of the stainless steel pan 906 and discharging the accumulated liquid to the outboard, the filling water pipe 903 is communicated with the water curtain nozzle 907, the water curtain nozzle 907 is located above the first LNG heating input pipe 105, the right-board LNG heating water system is cooled through the water curtain nozzle 907 in time, the safety is improved, liquid natural gas is added to the gas supply system 1 through the filling station 9, and performing air supply work.

In summary, in the LNG single-fuel gas supply system, the LNG storage tank 6 is led out to the first gasification heating system 4 and the second gasification heating system 5 through the lower liquid supply outlet 608, the first buffer tank 402 can be adjusted according to the intake pressure of the engine and the gasified gas supply pressure, when the storage tank pressure is lower than the gas supply pressure, the pressurization processing is performed through the pressurization unit, when the storage tank pressure is higher than the set gas supply pressure, the gas phase NG in the gas phase space inside the storage tank can be preferentially utilized, the storage tank pressure is further reduced, the BOG gas is processed at the same time, the LNG stored in the LNG storage tank 6 enters the vaporizer to be gasified under the internal pressure of the storage tank, enters the host and the generator after entering the host GVU valve unit through the buffer tank and the double-wall pipeline to be adjusted, the safety valve bank 8 can be remotely operated through the emergency remote control valve 802, the safety valve bank 8 is adjusted, the pipeline of the gas supply system 1 is protected at any time, the temperature sensors can be arranged at the high-temperature side outlets of the gasified gas at the port fuel bin joint 2 and the starboard fuel bin joint 3, the phenomenon that the heating medium is frozen due to too low temperature is prevented, the working state inside the LNG storage cabin 6 is detected through the first instrument valve group 701, the second instrument valve group 702 and the valve group instrument 703, information is converted and sent to a fuel gas security management system through the wireless transmission module, real-time online monitoring management is achieved, and remote management work is facilitated.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. An LNG single-fuel gas supply system, includes gas supply system (1), its characterized in that: the gas supply system (1) comprises a port bunker joint (2), a starboard bunker joint (3), a first gasification heating system (4), a second gasification heating system (5), an LNG storage cabin (6), an instrument system (7), a safety valve bank (8) and a filling station (9), wherein a sewage pipeline is arranged around the outside of the gas supply system (1), the gas supply system (1) further comprises two pure LNG gas engines and a pure LNG gas generator set, the first gasification heating system (4) and the second gasification heating system (5) are used for gasifying LNG fuel, the LNG storage cabin (6) is arranged to be a vacuum heat-insulation sealed tank body, the gas supply system (1) adopts a double-wall pipeline for supplying gas, the fuel station (9) is used for liquefying natural gas to the gas supply system (1), the port bunker joint (2) and the starboard bunker joint (3) both comprise a heat medium valve, a heat medium valve and a filling pipe, External interfaces are reserved on the pipes and the walls, and the port fuel bin joint (2) and the starboard fuel bin joint (3) further comprise a nitrogen purging pipeline and a low-temperature valve.

2. An LNG mono-fuel gas supply system according to claim 1, wherein: the fuel tank joint air supply system is characterized in that a first ventilation pipe (101), a first ventilation outlet pipe (102), a second ventilation outlet pipe (103), a second ventilation pipe (104), a first LNG heating inlet pipe (105), a first ventilation inlet pipe (106), a first LNG heating outlet pipe (107), a first nitrogen input pipe (108), a first NG gas supply outlet pipe (109), a second NG gas supply outlet pipe (110), a first discharge pipe (111), a second discharge pipe (112), a third NG gas supply outlet pipe (113), a second nitrogen input pipe (114), a second LNG heating outlet pipe (115), a second ventilation inlet pipe (116) and a second LNG heating inlet pipe (117) are arranged outside the gas supply system (1), the first ventilation outlet pipe (102) and the second ventilation outlet pipe (103) are respectively communicated with joint positions of a port tank joint position (2) and a starboard tank joint position (3) for ventilation outlet, and the first ventilation inlet pipe (106) and the second ventilation outlet pipe (116) are respectively communicated with a port tank joint position (2) and a starboard tank joint position (3) for ventilation inlet pipe (116), and the fuel tank joint position (2) for ventilation outlet And the ventilation inlet is arranged at the joint of the joint (3) of the side bunker, and the first ventilation outlet pipe (102), the second ventilation outlet pipe (103), the first ventilation inlet pipe (106) and the second ventilation inlet pipe (116) replace the gas in the gas supply system (1).

3. An LNG mono-fuel gas supply system according to claim 2, characterized in that: the first gasification heating system (4) comprises a first gasification heater (401) and a first buffer tank (402), the first buffer tank (402) is communicated with the first gasification heater (401) through a gas phase pipe, the first gasification heater (401) is of a shell-and-tube type, two independent pipe passes are arranged in the first gasification heater, one path is used as a vaporizer for pressurizing a fuel tank, the other path is used for evaporating and heating natural gas fuel, and a gas phase pipeline detection group (403) is arranged between the first gasification heater (401) and the first buffer tank (402), the first buffer tank (402) is communicated with a third NG gas supply outlet pipe (113) through a gas phase pipe, the first gasification heater (401) is communicated with the second LNG heating outlet pipe (115) through a heating medium pipe, and the heating medium of the first gasification heater (401) is set to be fresh water, and the second nitrogen input pipe (114) is respectively communicated with the third NG gas supply outlet pipe (113) and the first buffer tank (402) through a nitrogen pipe.

4. An LNG single fuel gas supply system according to claim 3, characterized in that: second gasification heating system (5) include second gasification heater (501) and second buffer tank (502), second gasification heater (501) go into pipe (105) intercommunication with first LNG heating exit tube (107) and first LNG heating respectively through the heating medium pipe, second gasification heater (501) are through gaseous phase pipe and second buffer tank (502) intercommunication, second buffer tank (502) respectively with first NG air feed exit tube (109) and second NG air feed exit tube (110) intercommunication through gaseous phase pipe, first nitrogen gas input tube (108) communicate with second buffer tank (502), first NG air feed exit tube (109) and second air feed exit tube (110) respectively through the nitrogen gas pipe.

5. An LNG single fuel gas supply system according to claim 4, characterized in that: the LNG storage cabin (6) comprises a fuel cabin ventilating port (601), a top spraying interface (602), a gas return outlet (603), a pressurized gas phase inlet (604), an upper liquid level meter valve interface (605), an overflow interface (606), a lower liquid level meter valve interface (607), a lower liquid supply outlet (608), a lower liquid adding inlet (609) and a spraying head (610), wherein the spraying head (610) is positioned in the middle of the interior of the LNG storage cabin (6), the fuel cabin ventilating port (601) is communicated with a safety valve group (8) through a safety valve release pipe, the top spraying interface (602) is respectively communicated with the spraying head (610), a filling station (9) and a second gasification heater (501) through liquid phase pipes, the gas return outlet (603) is communicated with the filling station (9) through a gas phase pipe, and the pressurized gas phase inlet (604) is respectively communicated with a first gasification heater (401) and a first buffer tank (402) through a gas phase pipe, the upper liquid level meter valve interface (605), the overflow interface (606) and the lower liquid level meter valve interface (607) are communicated with an instrument system (7) through instrument pipelines, the lower liquid supply outlet (608) is communicated with the first gasification heater (401) through a liquid phase pipe, and the lower liquid injection port (609) is respectively communicated with the filling station (9) and the second gasification heater (501) through the liquid phase pipe.

6. An LNG single fuel gas supply system according to claim 5, characterized in that: instrumentation system (7) is including first instrument valves (701), second instrument valves (702) and valves instrument (703), first instrument valves (701) communicate with second instrument valves (702) and valves instrument (703) respectively through the instrument pipe, instrumentation system (7) still including panel board and wireless transmission module.

7. An LNG single fuel gas supply system according to claim 6, characterized in that: the safety valve group (8) comprises a normally closed safety valve (801) and an emergency remote control valve (802), the normally closed safety valve (801) is used for releasing pipeline pressure, and the emergency remote control valve (802) is remotely controlled to be switched on and off through an emergency remote control button.

8. An LNG mono-fuel gas supply system according to claim 7, wherein: the filling station (9) comprises a third nitrogen input pipe (901), a third discharge pipe (902), a filling water pipe (903), a liquid filling pipe orifice (904), an air return pipe orifice (905), a stainless steel liquid collecting tray (906) and a water curtain spray head (907), wherein the third nitrogen input pipe (901), the third discharge pipe (902) and the filling water pipe (903) are all positioned outside the gas supply system (1), and the third nitrogen input pipe (901), the second nitrogen input pipe (114) and the first nitrogen input pipe (108) are all connected into a nitrogen system, the third nitrogen input pipe (901) is respectively communicated with a liquid adding pipe orifice (904) and an air return pipe orifice (905) through a nitrogen pipe, the third discharge pipe (902) is used for collecting accumulated liquid of the stainless steel liquid collecting tray (906) and discharging the accumulated liquid to the outboard, the filling water pipe (903) is communicated with a water curtain spray head (907), and the water curtain spray head (907) is positioned above the first LNG heating inlet pipe (105).

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