CN101074760B - Method and apparatus for supplying natural gas to gas demand sides - Google Patents

Method and apparatus for supplying natural gas to gas demand sides Download PDF

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Publication number
CN101074760B
CN101074760B CN2007100882011A CN200710088201A CN101074760B CN 101074760 B CN101074760 B CN 101074760B CN 2007100882011 A CN2007100882011 A CN 2007100882011A CN 200710088201 A CN200710088201 A CN 200710088201A CN 101074760 B CN101074760 B CN 101074760B
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gas
forced evaporation
natural
cargo tank
predetermined pressure
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CN101074760A (en
Inventor
柳承恪
许晏
李哲雨
朴铉基
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Hanhua Ocean Co ltd
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Daewoo Shipbuilding and Marine Engineering Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
    • 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
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F17C2205/0134—Two or more vessels characterised by the presence of fluid connection between vessels
    • F17C2205/0142—Two or more vessels characterised by the presence of fluid connection between vessels bundled in parallel
    • 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
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F17C2205/0134—Two or more vessels characterised by the presence of fluid connection between vessels
    • F17C2205/0146—Two or more vessels characterised by the presence of fluid connection between vessels with details of the manifold
    • 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
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0326—Valves electrically actuated
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • 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
    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/046—Localisation of the removal point in the liquid
    • F17C2223/047—Localisation of the removal point in the liquid with a dip tube
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/033—Small pressure, e.g. for liquefied gas
    • 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
    • F17C2227/0135—Pumps
    • 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0178—Arrangement in the vessel
    • 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
    • F17C2227/0171—Arrangement
    • F17C2227/0185—Arrangement comprising several pumps or 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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • 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
    • 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
    • F17C2265/037—Treating the boil-off by recovery with pressurising
    • 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
    • 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

Disclosed herein is a method and apparatus for stable supply of natural gas to a gas demand side in an LNG carrier. With the method, natural gas comprising natural boil-off gas generated in a cargo tank containing LNG and forced boil-off gas generated by vaporizing LNG pumped from the cargo tank is supplied to the gas demand side. The forced boil-off gas or a mixed gas of the forced boil-off gas and natural boil-off gas having a predetermined pressure or more is returned to the cargo tank or to a gas header connecting a plurality of the cargo tanks to one another to supply the natural gas at the predetermined pressure or more.

Description

Be used for the method and apparatus of natural gas supply to gas party in request
Technical field
The present invention relates to that a kind of (liquefied natural gas LNG) stably is fed to rock gas the method and apparatus of gas party in request in the carrier (carrier) in LNG Liquefied natural gas.More particularly, the present invention relates to a kind of method and apparatus, its when in the LNG carrier with natural gas supply when the gas party in request, at natural boil-off gas (natural boil-off gas, NBOG) under the operation repetitive situation of compressor and forced vaporization device, make via the operation of forced vaporization device can to keep stable, and described method and apparatus can be about the load variations of LNG carrier and in the stable release of vaporizer outlet port realization pressure owing to during the sailing in ballast of LNG carrier, produce the instability operation of the NBOG compressor that is used for supply of fuel that the low-load operation of the NBOG compressor that a small amount of natural boil-off gas caused causes.
Background technique
The LNG Liquefied natural gas oil tanker is advanced by one or more steam turbine usually.Therefore, oil tanker possesses boiler and produces steam.In the load navigation, about 50% fuel is the natural boil-off gas by the LNG cargo tank supply of oil tanker.Because LNG has low-down boiling point (approximately-162 ℃), although thereby its ratio less, no matter the continuous evaporation of LNG how, still takes place in the adiabaticity of cargo tank inevitably in oil tanker.Conventionally, some in the required fuel of boiler satisfies by using this type of natural boil-off gas.Residual fuel is supplied from heavy hydrocarbon liquid fuel (being also referred to as " fuel oil ") stock.
Yet, advancing required steam total amount in order to increase oil tanker, oil tanker must have the ability that only produces enough heat energy by combustion of natural gas.For this purpose, oil tanker additionally possesses the forced vaporization device, and it is to be used for the device of natural gas supply to the burner that is associated with boiler.In addition, oil tanker possesses compressor, to keep the constant pressure of the gas that is fed to burner.
About natural boil-off gas and the forced evaporation gas by the forced vaporization device are fed to burner, there are two kinds of well-known methods.
In one approach, in compressor upstream end mixing forced evaporation gas and natural boil-off gas.For instance, as be entitled as No. the 290726th, the Korean utility model registration of " Boil-off gas supply system " and be entitled as statement in No. the 410367th, the Korean utility model registration of " Apparatus for supplying fuel in LNG carrier ", natural boil-off gas in the LNG cabin is mixed at the compressor upstream end with forced evaporation gas, and then is fed in the compressor.
In No. the 290726th, Korean utility model registration, the gas that is fed to compressor 212 and power propulsion apparatus 214 from cargo tank 210 is divided into two kinds, as shown in Figure 1.A kind of gas is the natural boil-off gas by the natural vaporization generation of liquid gas in the cargo tank 210, and another kind is the forced evaporation gas that produces by its forced vaporization.Natural boil-off gas and forced evaporation gas are cooled to the proper temperature scope by gas cooler 216, and are fed to compressor 212.Herein, described proper temperature scope is-150 to-130 ℃ approximately.Then, described gas is compressed in compressor 212, and is fed to Powerpush Unit 214 by discharge conduit 219 with suitable head pressure.
Gas pipeline 220 is between cargo tank 210 and gas cooler 216, to form the flow path of natural boil-off gas and forced evaporation gas.Gas pipeline 220 comprises: natural boil-off gas pipeline 220a, and it is transported to gas cooler 216 with natural boil-off gas from cargo tank 210; Gas Returning pipe 220b, it allows liquid gas to get back to cargo tank 210 afterwards via gas cooler 216 by gas pump 211 suctions in cargo tank 210; And forced evaporation feed channel 220c, the one end is from the The initial segment H bifurcated of gas Returning pipe 220b, and the other end is connected to natural boil-off gas pipeline 220a so that forced evaporation gas is transported to gas cooler 216 from cargo tank 210.Forced evaporation feed channel 220c possesses vaporizer 224, and it forces to change into gaseous state with liquid gas.
Natural evaporative air in the cargo tank 210 is in natural boil-off gas pipeline 220a.Simultaneously, the liquid gas that has been aspirated by gas pump 211 flows among the The initial segment H of gas Returning pipe 220b and forced evaporation feed channel 220c.
Herein, when in the cargo tank 210 by the liquid gas of gas pump 211 suction by vaporizer 224 and during forced vaporization, its natural boil-off gas in natural boil-off gas pipeline 220a is mixed and flow in the gas cooler 216.Yet, will directly be directed to gas cooler 216 and be not to be directed under the situation of vaporizer 224 from the The initial segment H of gas Returning pipe 220b by the gas of gas pump 211 suction, gas turns back to cargo tank 210.
Yet, since the method pay close attention to compressor upstream and downstream place gas temperature control and compress when needing forced evaporation gas and natural boil-off gas, thereby there is a following shortcoming, be high-power, the complicated controlling method of compressor and motor and need mist separator (or cooler 216) to enter compressor to prevent liquid particles.
In order to solve described problem, the technology in compressor downstream part mixing forced evaporation gas and natural boil-off gas is proposed.For instance, openly disclose this type of technology in the case in early days 2003-0017423 number and 2003-0073975 Korean Patent.The 2003-0073975 Korean Patent discloses the invention that is disclosed in the case in early days and relates to a kind of being suitable at LNG carrier term of voyage by producing from the cargo tank of the boil-off gas that is stored in LNG vaporization wherein from the next heat of external transmission.Described cargo tank comprises: gas dome 30, and it is positioned at cargo tank 20 tops, makes to discharge boil-off gas in the cargo tank 20 by described gas dome 30; The first low-power compressor 50, it is connected to gas dome 30 to improve the pressure of boil-off gas; Gas heater 60, it is connected to the first low-power compressor 50 to improve the temperature of boil-off gas; Safety check 170, it is arranged between the first low-power compressor 50 and the gas heater 60 to prevent the reverse flow of boil-off gas; The second low-power compressor 180, it is used to prepare overhauling and checking of the first low-power compressor 50; Constant velocity motors 40, it drives the first and second low- power compressors 50 and 180; Boiler 90, it is connected to gas heater 60 with the burning boil-off gas; Main valve 70, it is arranged between the engine compartment 80 at gas heater 60 and boiler 90 places; The jet pump (strip spray pump) 100 that clears the ship, its bottom that is installed in cargo tank 20 come the gas deficiency during the burn operation of supplement boiler 90 with supply LNG; Flow control valve 120, the part of the LNG that is discharged by the described jet pump 100 of clearing the ship is sent in the described flow control valve 120 by pressure controlled valve 110; Recovery line (recovery line) 130, it is connected to pressure controlled valve 110, is recovered in the cargo tank with remaining LNG after will being sent to flow control valve 120; Heat-operated valve 140, it is connected to flow control valve 120; Vaporizer 150, it is connected to flow control valve 120 and changes gaseous state with the state with LNG into from liquid state; Mixer 160, it is connected to vaporizer 150 and heat-operated valve 140, in mixer 160 liquid LNG is mixed with gaseous state LNG; And boiler 90, it is connected to mixer 160 with combustion of gaseous LNG.
The 2003-0017423 Korean Patent openly illustrates the details relevant with the pressure and temperature in each flow path among Fig. 1 of case and Fig. 2 in early days.
The disclosure of described open case is incorporated herein by reference.
Inventor of the present invention has found will be less than natural boil-off gas (natural boil-off gas owing to produce a small amount of natural boil-off gas during the sailing in ballast of LNG carrier, NBOG) the required gas of the minimum load of compressor is incorporated under the situation in the NBOG compressor, the load of locating with gas party in request in the LNG carrier (for example boiler) exists under the situation of bigger variation, can not guarantee the stable operation of NBOG compressor.
There is not the countermeasure that can solve this type of problem in the prior art.
Summary of the invention
Therefore, the objective of the invention is to allow in the LNG carrier with predetermined pressure or more high pressure supply a gas to gas party in request.The NBOG compressor that another object of the present invention is to allow to be used for to supply fuel at the LNG carrier by the operation of suitably keeping cargo tank pressure, constant compression device gas party in request is operated with relative higher load.
According to an aspect of the present invention, provide a kind of be used for the LNG carrier with predetermined pressure or more high pressure with natural gas supply to the method for gas party in request, described rock gas is included in natural boil-off gas and the forced evaporation gas by vaporizing and producing from the LNG of cargo tank suction that produces in the cargo tank that contains LNG, wherein for predetermined pressure or high pressure supply rock gas more, have predetermined pressure or more the mixed gas of the forced evaporation gas of high pressure or forced evaporation gas and natural boil-off gas get back to cargo tank or get back to a plurality of cargo tanks gas collecting tube connected to one another.
Gas party in request can be any one in boiler, duel fuel engine and the gas turbine.
According to an embodiment, the gas of getting back to cargo tank must have predetermined pressure or high pressure more, and for this purpose, controls the mixed gas of forced evaporation gas or forced evaporation gas and natural boil-off gas in many ways so that it has predetermined pressure or high pressure more.For instance, the mixed gas of forced evaporation gas or forced evaporation gas and natural boil-off gas can have predetermined pressure or high pressure more by the forced vaporization device.Perhaps, if the mixed gas of forced evaporation gas or forced evaporation gas and natural boil-off gas does not have predetermined pressure or high pressure more, use the independent compression device to control the mixed gas of forced evaporation gas or forced evaporation gas and natural boil-off gas so so that it has predetermined pressure or high pressure more when getting back to cargo tank or gas collecting tube.
In addition, can forced evaporation gas be mixed with natural boil-off gas at the compressor upstream end.Preferably, natural boil-off gas is by compressor compresses, and forced evaporation gas has predetermined pressure or high pressure more through vaporization, mixes afterwards with by the natural boil-off gas of compressor compresses.
According to the present invention, since have predetermined pressure or more the gas of high pressure get back to cargo tank, thereby in cargo tank, natural boil-off gas maintained predetermined pressure or high pressure more, thereby make compressor to make compressor stably to operate with relative higher load operation.The pressure of getting back to the gas of cargo tank can be according to differently changing according to the pressure range of compressor specification.In the described hereinafter example, natural boil-off gas has the absolute pressure of about 1.06 crust in cargo tank, and forced evaporation gas has the absolute pressure of about 1.96 crust.
According to a further aspect in the invention, a kind of being used for comprises the compressor that is used to compress the natural boil-off gas that produces from the cargo tank that contains LNG at the LNG carrier with natural gas supply to the equipment of gas source of demand, be used for from the pump of cargo tank suction LNG, and the LNG that aspirated of being used to vaporize is to produce the vaporizer of forced evaporation gas, wherein the forced evaporation gas of compressor in the compressor upstream or downstream part mixes with natural boil-off gas and with predetermined pressure or more high pressure be fed to gas party in request, and have predetermined pressure or more the mixed gas of the forced evaporation gas of high pressure or forced evaporation gas and natural boil-off gas get back to cargo tank or with a plurality of cargo tanks gas collecting tube connected to one another.
Gas party in request can be any one in boiler, duel fuel engine and the gas turbine.
Forced evaporation gas can mix with natural boil-off gas before or after natural boil-off gas compression.Preferably, natural boil-off gas is by compressor compresses, and forced evaporation gas has predetermined pressure or high pressure more through vaporization, and with mix by the natural boil-off gas of compressor compresses.
The mixed gas that the independent compression device can be installed in forced evaporation gas or forced evaporation gas and natural boil-off gas is got back on the pipeline that cargo tank or gas collecting tube pass through, with when being less than or equal to predetermined value separately or with the pressure that the state that mixes with natural boil-off gas is got back to the forced evaporation gas of cargo tank or gas collecting tube, increase the described pressure that returns gas.Under compressor downstream part and situation that natural boil-off gas is mixed, because forced evaporation gas has predetermined pressure or high pressure more when the compressor downstream part mixes with it, thereby the independent compression device is optional at forced evaporation gas.
Described equipment can further comprise: Returning pipe, and it is connected to downstream from vaporizer or is connected to the downstream of the pipeline that is attached to described Returning pipe, and the mixed gas of forced evaporation gas or forced evaporation gas and natural boil-off gas is got back to cargo tank by described Returning pipe; And control valve, it is on described Returning pipe, to control returning of forced evaporation gas or mixed gas by opening or closing described control valve.Have predetermined pressure or high pressure more owing to get back to the forced evaporation gas of cargo tank or gas collecting tube or mixed gas, thereby may be only come the amount of returning of control gaseous by opening and closing control valve.
Description of drawings
From the detailed description of doing below in conjunction with accompanying drawing, will more clearly understand of the present invention more than or other purpose, feature and other advantage.
Fig. 1 is the schematic representation of the natural gas supply equipment of No. the 290726th, Korean utility model registration.
Fig. 2 is the Korean Patent schematic representation of the natural gas supply equipment of case 2003-73975 number openly in early days.
Fig. 3 is that explanation is used at the LNG carrier the schematic representation of natural gas supply to the equipment of gas party in request according to one embodiment of the invention.
Fig. 4 is that explanation is used at the LNG carrier the schematic representation of natural gas supply to the equipment of gas party in request according to another embodiment of the present invention.
Embodiment
To describe one exemplary embodiment in detail referring to accompanying drawing.
Fig. 3 is that explanation is used at the LNG carrier the schematic representation of natural gas supply to the equipment of gas party in request according to one embodiment of the invention.The structure and the operation of described equipment hereinafter will be described.
The bottom of LNG cargo tank 310 is filled by LNG 312 and top is filled by natural boil-off gas 313.The natural boil-off gas 313 that produces in the cargo tank 310 is compressed by NBOG compressor 340 afterwards in the outlet of passing cargo tank 310 tops (dome).
The LNG 312 of storage cabin 310 is transferred to portion out of my cabin by pump 320.Because the amount of LNG is less during the sailing in ballast of LNG carrier, thereby pump 320 preferably can be at the stripping pump of cargo tank 310 bottoms suction LNG.
LNG by pump 320 transmission is vaporized by forced vaporization device 330.Forced evaporation gas by 330 vaporizations of forced vaporization device mixes with the natural boil-off gas of being compressed by compressor 340, and is supplied to gas party in request 350 (for example, boiler, duel fuel engine, gas turbine etc.).
Simultaneously, get back to cargo tank 310 by Returning pipe, control valve 332 is set on described Returning pipe by the part of the forced evaporation gas of forced vaporization device 330 vaporization.
In cargo tank 310, natural boil-off gas 313 is maintained the absolute pressure of about 1.06 crust, and its boil down to is had the absolute pressure of about 1.96 crust by compressor 340.Vaporize by vaporizer 330 from the LNG that cargo tank 310 sends by pump 320, and have the absolute pressures of about 1.96 crust.Forced evaporation gas and compressed natural boil-off gas are fed to gas party in request 350 with about 1.96 absolute pressures of clinging to.
Because the forced evaporation gas that returns from forced vaporization device 320 has the absolute pressure of 1.96 crust, and the natural boil-off gas in the cargo tank has the absolute pressures of about 1.06 crust, so the pressure difference between forced evaporation gas and the natural boil-off gas makes it possible to easily control forced evaporation gas and return from forced vaporization device 330 by opening or closing control valve 332.By this kind control, may supply and have the required predetermined pressure of gas party in request or the gas of high pressure more.In addition, even when gas party in request 350 only allows variation in pressure in the prespecified range and desired gas quantitative change, also may be by supplying gas in predetermined pressure range by the amount that control forced evaporation gas returns from forced vaporization device 330 of opening or closing of control valve 332.
For instance, for the duel fuel engine between all gases party in request, pressure must be strict controlled in ± 0.2 the crust the tolerance limit pressure range in.In the case, by in the degree that opens or closes of control control valve, being diverted to Returning pipe, may come supply gas with the pressure in the prespecified range that allows in each gas party in request place by the forced evaporation gas of forced vaporization device 330 supplies.The those skilled in the art can use the various sensors that are assemblied in the cabin or are assembled to the various pipelines of LNG carrier easily to use or revise this kind pressure control.
In Fig. 3, the gas of getting back to cargo tank 310 is illustrated as has the forced evaporation gas that is increased to the pressure of predetermined value or higher value via vaporizer 330.Yet, needless to say, compressed device 340 compressions and have predetermined pressure or more the forced evaporation gas of high pressure and the mixed gas of natural boil-off gas can be got back to cargo tank.
In addition, have predetermined pressure or more be mixed with each other after the high pressure although in Fig. 3 forced evaporation gas and natural boil-off gas be illustrated as, natural boil-off gas can be mixed with forced evaporation gas before by compressor 340 compressions.Yet, in the case, there are some shortcomings, promptly need the moisture drum to come from forced evaporation gas, to remove drop, and increased the power of compressor 340.In order to return the forced evaporation gas with the pressure that is lower than predetermined extent or the mixed gas of forced evaporation gas and natural boil-off gas, the independent compression device is provided to Returning pipe, wherein control valve 332 is positioned at the downstream part of independent compression device.
In addition, although get back to cargo tank 310 from the forced evaporation gas of forced vaporization device 330 in the embodiment shown in fig. 3, in another embodiment shown in Figure 4, can get back to cargo tank 310 or get back to each cargo tank gas collecting tube 370 connected to one another from the forced evaporation gas of forced vaporization device 330.If forced evaporation gas is got back to gas collecting tube 370, forced evaporation gas directly can be fed to the compressor 340 (for example, the LD compressor) that is connected to gas collecting tube 370 so and not get back to cargo tank 310, make the air pressure of allowing that can keep compressor.
Aforesaid the present invention's structure provides multiple advantage.For routine techniques, the required gas of minimum operation load that will be less than the NBOG compressor that is used for supply of fuel during the sailing in ballast of LNG carrier owing to a small amount of natural boil-off gas is incorporated under the situation of NBOG compressor, with under the bigger situation of the load variations of gas party in request, can not guarantee the stable operation of NBOG compressor.In addition, for routine techniques, owing to operate below the minimum operation load at it at the NBOG compressor that is used for supply of fuel during the sailing in ballast of LNG carrier, thereby can not effectively keep the pressure of cargo tank.In addition, according to routine techniques, when the forced vaporization device in the sailing in ballast of LNG carrier or load navigation during operation the load at gas party in request place exist under the fast-changing situation, the pressure of outlet of forced vaporization device and boiler ingress will increase fast probably.In addition, according to routine techniques, although may increase by surge (surge) control valve that uses the NBOG compressor and operate compressor from the flow velocity of NBOG compressor, but the shortcoming that occurs is, because the high-temperature gas in compressor downstream circulation, thereby the temperature of compressor outlet continues to increase the feasible stable operation that is difficult to carry out the NBOG compressor.
In this regard, according to the present invention, provide with sailing in ballast during gas get back to Returning pipe and the control valve that cargo tank is associated, to increase the flow velocity that gas turns back to cargo tank, make the NBOG compressor higher load operation relatively be used for supply of fuel, thereby realize the stable operation of compressor and so keep the suitable pressure of cargo tank.In addition, according to the present invention, owing to during sailing in ballast, get back to cargo tank by the forced evaporation gas of forced vaporization device, even thereby when the NBOG compressor the minimum operation load is following when operating also can be by keep the pressure of cargo tank rightly via the automatic operation of the extra ducts of the adjustment that is used to load.In addition, according to the present invention,, thereby, may operate the pressure of keeping cargo tank reposefully automatically by it in order not destroy the pressure of cargo tank because boil-off gas is got back to cargo tank.Utilize these advantages of the present invention, may realize the automation of the gas management system of getting in touch with boiler.
Easily see from the above description, according to the present invention, the gas (especially treating to be fed to from the forced vaporization device forced evaporation gas of gas party in request) of waiting to be fed to gas party in request is divided to Returning pipe, make can gas party in request required predetermined pressure or more high pressure (especially with the pressure in the prespecified range that allows in gas party in request) supply rock gas.In addition and since have predetermined pressure or more the gas of high pressure get back to cargo tank, thereby in cargo tank, natural boil-off gas maintained predetermined pressure or high pressure more, thereby makes compressor to make compressor stably to operate with relative higher load operation.
Should be appreciated that, described embodiment and accompanying drawing for purpose of explanation, and the present invention is only limited by appended claims.In addition, be understood by those skilled in the art that, under situation about not breaking away from, allow various modifications, interpolation and substitute according to the enclose scope of the invention of claims and spirit.

Claims (9)

  1. One kind in the LNG Liquefied natural gas carrier with the pressure that equals predetermined pressure or be higher than described predetermined pressure with the method for natural gas supply to gas party in request, described rock gas is included in natural boil-off gas and the forced evaporation gas by vaporizing and producing from the LNG Liquefied natural gas of described cargo tank suction that produces in the cargo tank that contains LNG Liquefied natural gas, it is characterized in that
    Wherein in order to supply described rock gas with the described pressure that equals described predetermined pressure or be higher than described predetermined pressure, the mixed gas with the described forced evaporation gas of the described pressure that equals described predetermined pressure or be higher than described predetermined pressure or described forced evaporation gas and natural boil-off gas is got back to described cargo tank or is got back to a plurality of described cargo tanks gas collecting tube connected to one another.
  2. 2. method according to claim 1 is characterized in that, wherein said gas party in request is any one in boiler, duel fuel engine and the gas turbine.
  3. 3. method according to claim 1 and 2, it is characterized in that, wherein compress described natural boil-off gas by compressor, and make the vaporization of described forced evaporation gas and have the described pressure that equals described predetermined pressure or be higher than described predetermined pressure and with mix by the described natural boil-off gas of described compressor compresses.
  4. 4. method according to claim 1 and 2, it is characterized in that, wherein when the described mixed gas of described forced evaporation gas or described forced evaporation gas and natural boil-off gas is got back to described cargo tank or described gas collecting tube, described forced evaporation gas of another compressor compresses or described mixed gas also make it get back to described cargo tank or described gas collecting tube with the described pressure that equals described predetermined pressure or be higher than described predetermined pressure.
  5. 5. one kind is used at the LNG Liquefied natural gas carrier natural gas supply it is characterized in that to the equipment of gas party in request it comprises:
    Compressor, the natural boil-off gas that its compression produces from the cargo tank that contains LNG Liquefied natural gas;
    Pump, it is from described cargo tank suction LNG Liquefied natural gas; And
    Vaporizer, the LNG Liquefied natural gas of its described suction of vaporizing to be producing forced evaporation gas,
    Wherein the described forced evaporation gas that comes from described vaporizer mixes with described natural boil-off gas at the upstream or the downstream part of described compressor, and be fed to described gas party in request with the pressure that equals predetermined pressure or be higher than described predetermined pressure, and the mixed gas with the described forced evaporation gas of the pressure that equals described predetermined pressure or be higher than described predetermined pressure or described forced evaporation gas and described natural boil-off gas is got back to described cargo tank or with a plurality of described cargo tanks gas collecting tube connected to one another.
  6. 6. equipment according to claim 5 is characterized in that, wherein said gas party in request is any one in boiler, duel fuel engine and the gas turbine.
  7. 7. equipment according to claim 5 is characterized in that, wherein said forced evaporation gas mixed with described natural boil-off gas before or after described natural boil-off gas compression.
  8. 8. equipment according to claim 5 is characterized in that it further comprises:
    Another compressor, its described mixed gas that is arranged on described forced evaporation gas or described forced evaporation gas and described natural boil-off gas are got back on the Returning pipe that described cargo tank or described gas collecting tube pass through.
  9. 9. equipment according to claim 8 is characterized in that, wherein,
    Described Returning pipe is connected to the downstream part of described vaporizer,
    The described mixed gas of described forced evaporation gas or described forced evaporation gas and described natural boil-off gas is got back to described cargo tank by described Returning pipe, and
    Control valve, its on described Returning pipe to control returning of described forced evaporation gas or described mixed gas by opening or closing described control valve.
CN2007100882011A 2006-05-19 2007-03-15 Method and apparatus for supplying natural gas to gas demand sides Active CN101074760B (en)

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KR1020060045018A KR100649863B1 (en) 2006-05-19 2006-05-19 Natural Gas Supplying Method?and Apparatus thereof in LNG Carrier
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KR20060063845A (en) 2006-06-12
CN101074760A (en) 2007-11-21
KR100649863B1 (en) 2006-11-28
EP1857727A3 (en) 2017-05-10
EP1857727A2 (en) 2007-11-21
EP1857727B1 (en) 2019-09-11

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