CN110762383A - System for recycling liquid cargo tank evaporated gas by using tube bundle type high-pressure gas cylinder set - Google Patents

System for recycling liquid cargo tank evaporated gas by using tube bundle type high-pressure gas cylinder set Download PDF

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CN110762383A
CN110762383A CN201911041099.9A CN201911041099A CN110762383A CN 110762383 A CN110762383 A CN 110762383A CN 201911041099 A CN201911041099 A CN 201911041099A CN 110762383 A CN110762383 A CN 110762383A
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gas
pressure
tube bundle
cargo tank
gas cylinder
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CN110762383B (en
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雒高龙
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F17C13/123—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for gas bottles, cylinders or reservoirs for tank vehicles or for railway tank wagons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0388—Arrangement of valves, regulators, filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/041—Methods for emptying or filling vessel by vessel
    • F17C2227/042—Methods for emptying or filling vessel by vessel with change-over from one vessel to another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/043—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/042—Reducing risk of explosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/046—Enhancing energy recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/036—Treating the boil-off by recovery with heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/07—Generating electrical power as side effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

Abstract

The invention discloses a system for recycling, storing and utilizing LNG ship liquid cargo tank evaporated gas by using a tube bundle type high-pressure gas cylinder group. The invention realizes the recovery, storage and utilization of the boil-off gas of the liquid cargo tank at normal temperature, controls the pressure of the cargo tank within a safe range, solves the problem of excess or deficiency of LNG BOG, provides stable BOG fuel supply for a host, avoids discharging the LNG boil-off gas to the atmosphere, avoids configuring an expensive reliquefaction device or a gas combustion device, and avoids using insulating materials and low-temperature steel. The invention realizes energy conservation and emission reduction, saves natural gas, is green and environment-friendly, has low cost and flexible arrangement, and can be widely used.

Description

System for recycling liquid cargo tank evaporated gas by using tube bundle type high-pressure gas cylinder set
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of water transportation equipment manufacturing, in particular to a system for recycling, storing and utilizing LNG ship liquid cargo tank evaporated gas to supply a gas fuel host/generator for use by using a tube bundle type high-pressure gas cylinder group.
[ background of the invention ]
The LNG ship transports and stores liquefied natural gas at normal pressure of 163 ℃, and due to the influence of external environmental heat, the movement of the ship, and the heat generated when the deep submersible pump in the LNG tank operates, the LNG in the tank is vaporized to generate boil-off gas BOG, and in order to maintain the pressure of the LNG cargo tank within a safe range, it is necessary to continuously discharge the BOG gas. These BOGs are currently handled mainly by the following methods, which have the following disadvantages:
1. the most common method is that BOG is utilized by a gas fuel main engine and a generator, and the problem of insufficient or excessive BOG often occurs. Especially, large LNG ships have a large cargo capacity, and often have a problem of excess BOG when they are fully loaded, moored, or maneuvered in and out of ports, and often have a problem of insufficient BOG when they are in a ballast navigation condition.
2. The surplus BOG is released into the atmosphere (free), thereby wasting resources, polluting the environment, being flammable, explosive and unsafe, the greenhouse effect of methane is higher than that of carbon dioxide, and the port is not allowed to discharge the surplus BOG.
3. The gas burning device (GCU) is used for burning, thereby wasting resources and polluting the environment.
4. And liquefying by a reliquefaction device and refilling the cargo tank. The reliquefaction device is expensive, the energy consumption is too large, and the economy is poor.
In addition, LNG also generates a large amount of BOG during filling, and it is necessary to supplement the BOG to the cargo tank during unloading or transferring to prevent vacuum, and therefore, how to recover, store, safely and effectively use the BOG at low cost is an urgent issue to be solved.
[ summary of the invention ]
The purpose of the invention is as follows: the invention aims to solve the defects in the prior art, and provides a system for recovering, storing and utilizing LNG ship liquid cargo tank boil-off gas by using a tube bundle type parallel high-pressure gas cylinder group to supply the LNG ship liquid cargo tank boil-off gas to a gas fuel main engine/generator. The invention adopts the gas cylinder group with smaller diameter to bear higher design pressure and has higher compression volume ratio, thereby storing more BOG gas in the same volume, and having flexible layout, low cost and good safety performance.
The technical scheme is as follows: the invention relates to a system for recycling, storing and utilizing LNG (liquefied natural gas) ship cargo hold evaporated gas to supply a gas fuel main engine/generator for use by using a tube bundle type parallel high-pressure gas cylinder group. The BOG control system mainly comprises an anti-vacuum pressure control valve, a check valve, a pressure temperature sensor, a 3-level gas air compressor, a heat exchanger, a 3-level gas pressure regulating valve and a buffer gas cylinder. The tube bundle type high-pressure gas cylinder chamber is provided with a high-pressure gas cylinder group, a hydraulic remote control stop valve, an explosion-proof device, a combustible gas detection alarm, an emergency pressure release valve, a spraying pipeline and equipment.
The working process is as follows: firstly, gas BOG naturally evaporated from a cargo tank of an LNG ship sequentially passes through a pressure gauge, an anti-vacuum pressure control valve, a thermometer, a flowmeter and a filter, enters a 3-level gas air compressor to increase the pressure to the maximum 25MPa, the volume is compressed to the minimum 1/250, the gas temperature is kept in the range of minus 30-45 ℃ through a heat exchanger, and the gas enters a high-pressure gas cylinder group through a check valve to be stored. And secondly, BOG gas from the high-pressure gas cylinder group enters a gas main engine/generator in the engine room through a pressure gauge, a hydraulic remote control stop valve, a check valve, a 3-level gas pressure regulating valve and a buffer gas cylinder for use.
Furthermore, the tube bundle type high-pressure gas cylinder group adopts parallel high-pressure gas cylinders, and the number, the specification and the size of the high-pressure gas cylinders can also adopt standard mature products according to different ship designs.
Furthermore, nitrogen is introduced into the tube bundle type high-pressure gas cylinder group chamber, the tube bundle type high-pressure gas cylinder group chamber is connected with a ship nitrogen generator, and a combustible gas detection alarm, an emergency pressure release valve and an explosion-proof device are arranged.
Furthermore, the emergency pressure release valve is connected with the ship discharge tower, and released gas enters the discharge tower to be discharged under emergency conditions, so that the safety of the whole system is ensured.
Further, the gas compressor includes three air compressors of establishing ties each other in order to improve gaseous pressure and reduce the volume step by step.
Further, the gas pressure regulating valve comprises three gas pressure regulating valves which are connected in series with each other so as to gradually reduce the pressure of the gas to be matched with the inlet pressure of the gas main engine/generator.
Furthermore, a spraying pipeline is arranged at the top of the tube bundle type high-pressure gas cylinder group chamber and is connected with a ship spraying system.
Has the advantages that:
1. the invention realizes the recovery, storage and utilization of the boil-off gas of the liquid cargo tank at normal temperature, controls the pressure of the cargo tank within a safe range, solves the problem of excess or deficiency of LNG BOG, provides stable BOG fuel supply for a host, avoids discharging the LNG boil-off gas to the atmosphere, avoids configuring an expensive reliquefaction device or a gas combustion device, and avoids using insulating materials and low-temperature steel.
2. The invention realizes energy conservation and emission reduction, saves natural gas, is green and environment-friendly, has low cost and flexible arrangement, and can be widely used.
3. The invention realizes the control of the gas pressure of the liquid tank in a safe range.
4. The invention avoids the design of the pressure of the cargo hold of the LNG ship, and reduces the ship construction cost.
5. The invention is suitable for thin film type, A type, B type and C type independent liquid cargo tank LNG ships and LNG filling ships defined in International bulk transport liquefied gas ship structure and equipment rules (IGC rules, 2014 edition) published by International maritime organization IMO.
[ description of the drawings ]
Fig. 1 is a diagram of a system for recovering, storing and utilizing boil-off gas from a cargo tank of an LNG carrier by using a tube bundle type high-pressure gas cylinder group according to an embodiment of the present invention;
FIG. 2 is a tube bundle high pressure gas cylinder chamber layout;
fig. 3 is an explanatory view of a section a-a of fig. 2.
In the figure:
1. the liquefied natural gas carrier cargo tank of the ship; 2. liquefying Natural Gas (LNG); 3. boil off gas BOG of liquefied natural gas; 4. a pressure gauge; 5. a vacuum-proof pressure control valve; 6. a thermometer; 7. a flow meter; 8. a filter; 9. a gas compressor; 10. a hydraulic remote control stop valve; 11. a pendulum check valve; 12. a heat exchanger; 13. a tube bundle type high-pressure gas cylinder group chamber; 14. a gas pressure regulating valve; 15. a buffer gas cylinder; 16. a marine gas main/generator;
60. a high pressure gas cylinder group; 61. a support structure; 62. an explosion proof device PRD; 63. a hydraulic remote control stop valve; 64. a pressure gauge; 65. a combustible gas detection alarm; 66. an emergency pressure relief valve; 67. a bleed tower; 68. spraying pipeline and equipment.
[ detailed description ] embodiments
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Referring to fig. 1, a system for recycling boil-off gas from a cargo tank of an LNG carrier to supply a gas fuel host/generator by using a tube bundle type high pressure gas cylinder group includes a BOG control system and a tube bundle type high pressure gas cylinder group room 13. The BOG control system comprises a pressure gauge 4, a vacuum pressure prevention control valve 5, a thermometer 6, a flowmeter 7, a filter 8, a gas compressor 9, a hydraulic remote control stop valve 10, a pendulum check valve 11 and a heat exchanger 12, which are sequentially connected to a tube bundle type high-pressure gas cylinder group chamber 13, and then the BOG control system passes through the pressure gauge 4, the hydraulic remote control stop valve 10, the pendulum check valve 11, a gas pressure regulating valve 14, a buffer gas cylinder 15, the hydraulic remote control stop valve 10 and the pendulum check valve 11 and is connected to a gas host/generator for use.
Referring to fig. 2, the layout of a tube bundle type high-pressure gas cylinder chamber includes a high-pressure gas cylinder group 60, a gas cylinder support structure 61, a hydraulic remote control stop valve 63, an explosion-proof device 62, a combustible gas detection alarm 65, an emergency pressure release valve 66, a spray pipeline and equipment 68. The working process is as follows: firstly, gas 3 naturally evaporated from a cargo tank 1 of an LNG ship sequentially passes through a pressure gauge 4, an anti-vacuum pressure control valve 5, a thermometer 6, a flowmeter 7 and a filter 8, enters a 3-level gas air compressor 9 to increase the pressure to the maximum of 25MPa and compress the volume to the minimum of 1/250, then passes through a heat exchanger 12 to keep the temperature of the gas within the range of-30-45 ℃, and then passes through a hydraulic remote control stop valve 10 and a pendulum check valve 11 to enter a high-pressure gas cylinder group 13 for storage. Then, the BOG gas from the high-pressure gas cylinder group 13 passes through the pressure gauge 4, the hydraulic remote control stop valve 10, the pendulum check valve 11, the 3-stage gas pressure regulating valve 14 and the heat exchanger 12 to enable the temperature and the pressure of the BOG to be matched with those of the gas main engine/generator, and then passes through the hydraulic remote control stop valve 10 and the pendulum check valve 11 to enter the gas main engine/generator in the engine room for use.
As a further optimization of the above embodiment:
preferably, the tube bundle type high-pressure gas cylinder group 60 adopts parallel high-pressure gas cylinders, and the number, specification and size of the high-pressure gas cylinders can be designed according to different ships, and standard mature products can also be adopted.
Preferably, the tube bundle type high-pressure gas cylinder group chamber 13 is filled with nitrogen, is connected with a ship nitrogen generator, and is provided with a combustible gas detection alarm 65, an emergency pressure release valve 66 and an explosion-proof device 62.
Preferably, the emergency pressure release valve 66 is connected with a ship discharge tower 67, and in an emergency situation, released gas enters the discharge tower to be discharged, so that the safety of the whole system is ensured.
Preferably, the gas compressor 9 comprises three air compressors connected in series to increase the pressure of the gas and reduce the volume of the gas.
Preferably, the gas pressure regulating valve 14 comprises three gas pressure regulating valves connected in series to step down the gas pressure to match the inlet pressure of the gas main engine/generator.
Preferably, the top of the tube bundle type high-pressure gas cylinder group chamber 13 is provided with a spraying pipeline 68 and a hydraulic remote control stop valve 63 which are connected with a ship spraying system, and the hydraulic remote control stop valve is normally closed.
Preferably, the hydraulic remote control stop valves 10 and 63 can be controlled remotely or manually.
Preferably, the BOG is compressed for storage in a high pressure gas cylinder battery during LNG filling or refuting.
Preferably, the BOG gas is recycled and stored through the method, so that the pressure of the liquid cargo tank is prevented from being increased due to excessive BOG gas, the design pressure of the liquid cargo tank of the LNG ship can be reduced, and the shipbuilding cost is reduced.
The invention realizes the recovery, storage and utilization of the boil-off gas of the liquid cargo tank at normal temperature, controls the pressure of the cargo tank within a safe range, solves the problem of excess or deficiency of LNG BOG, provides stable BOG fuel supply for a host, avoids discharging the LNG boil-off gas to the atmosphere, avoids configuring an expensive reliquefaction device or a gas combustion device, and avoids using insulating materials and low-temperature steel.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A system for recovering, storing and utilizing LNG ship liquid cargo tank boil-off gas to supply gas fuel to a main engine/generator by using a tube bundle type high-pressure gas cylinder group is characterized in that: the liquefied natural gas liquid cargo tank (1) of the ship, a pressure gauge (4), a vacuum-proof pressure control valve (5), a thermometer (6), a gas compressor (9), a hydraulic remote control stop valve (10), a pendulum check valve (11) and a heat exchanger (12) are sequentially connected to a tube bundle type high-pressure gas cylinder group chamber (13), and then are connected to a gas main engine/generator (16) through a gas pressure regulating valve (14) and a buffer gas cylinder (15).
2. The system of claim 1 for recovering, storing and utilizing LNG ship cargo tank boil-off gas for use with a gaseous fuel-fueled host/generator using a tube bundle type high pressure gas cylinder stack, wherein: the tube bundle type high-pressure gas cylinder group chamber (13) comprises a tube bundle type parallel high-pressure gas cylinder group (60), a combustible gas detection alarm (65), an emergency pressure release valve (66), a spraying pipeline and equipment (68).
3. The system of claim 1 for recovering, storing and utilizing LNG ship cargo tank boil-off gas for use with a gaseous fuel-fueled host/generator using a tube bundle type high pressure gas cylinder stack, wherein: the anti-vacuum pressure control valve (5) controls the BOG pressure of the LNG liquid tank to be within the designed safe pressure range of the liquid cargo tank.
4. The system of claim 1 for recovering, storing and utilizing LNG ship cargo tank boil-off gas for use with a gaseous fuel-fueled host/generator using a tube bundle type high pressure gas cylinder stack, wherein: the gas compressor (9) adopts at least 3-stage series compression technology, so that the gas pressure reaches the maximum 25 MPa.
5. The system of claim 1 for recovering, storing and utilizing LNG ship cargo tank boil-off gas for use with a gaseous fuel-fueled host/generator using a tube bundle type high pressure gas cylinder stack, wherein: the outlet temperature of the heat exchanger (12) is-30 ℃ to 45 ℃.
6. The system of claim 2 for recovering, storing and utilizing LNG ship cargo tank boil-off gas for use with a gaseous fuel-fueled host/generator using a tube bundle type high pressure gas cylinder stack, wherein: the tube bundle type parallel high-pressure gas cylinder set comprises an explosion-proof device (62), a pressure gauge (4) and a hydraulic remote control stop valve (63).
7. The system of claim 1 for recovering, storing and utilizing LNG ship cargo tank boil-off gas for use with a gaseous fuel-fueled host/generator using a tube bundle type high pressure gas cylinder stack, wherein: the gas pressure regulating valve (14) adopts at least 3-stage pressure reduction technology to enable the outlet pressure to be matched with the inlet pressure of a ship gas main engine/generator (16), and the supply pressure is kept stable through a buffer gas cylinder (15).
8. The system of claim 1 for recovering, storing and utilizing LNG ship cargo tank boil-off gas for use with a gaseous fuel-fueled host/generator using a tube bundle type high pressure gas cylinder stack, wherein: the combustible gas detection alarm (65) and the emergency pressure release valve (66) are connected with the discharge tower (67).
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CN113482802A (en) * 2021-06-25 2021-10-08 沪东中华造船(集团)有限公司 Marine fuel gas supply system with buffer device and fuel gas supply method
CN114412635A (en) * 2021-12-06 2022-04-29 沪东中华造船(集团)有限公司 Volatile gas comprehensive management system for fuel power generation device
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