CN108870070A - The BOG recoverying and utilizing method and system of LNG gasification station storage tank - Google Patents
The BOG recoverying and utilizing method and system of LNG gasification station storage tank Download PDFInfo
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- CN108870070A CN108870070A CN201710316472.1A CN201710316472A CN108870070A CN 108870070 A CN108870070 A CN 108870070A CN 201710316472 A CN201710316472 A CN 201710316472A CN 108870070 A CN108870070 A CN 108870070A
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- bog
- liquid feeding
- feeding pipeline
- storage tank
- segmentation
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- 238000002309 gasification Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 171
- 238000011084 recovery Methods 0.000 claims abstract description 64
- 238000004064 recycling Methods 0.000 claims abstract description 25
- 230000008676 import Effects 0.000 claims abstract description 6
- 230000011218 segmentation Effects 0.000 claims description 81
- 239000012530 fluid Substances 0.000 claims description 9
- 238000003032 molecular docking Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 18
- 239000003570 air Substances 0.000 description 14
- 239000007789 gas Substances 0.000 description 13
- 238000013459 approach Methods 0.000 description 11
- 239000003345 natural gas Substances 0.000 description 9
- 230000003068 static effect Effects 0.000 description 6
- 230000006837 decompression Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- RAOIDOHSFRTOEL-UHFFFAOYSA-N tetrahydrothiophene Chemical compound C1CCSC1 RAOIDOHSFRTOEL-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- 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
- 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
- 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
- F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
-
- 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
- F17C2205/0332—Safety valves or pressure relief 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
- 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
- F17C2205/0352—Pipes
-
- 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
- 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
- F17C2225/0107—Single phase
- F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
-
- 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
- F17C2227/0302—Heat exchange with the fluid by heating
- F17C2227/0309—Heat exchange with the fluid by heating using another 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
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0302—Heat exchange with the fluid by heating
- F17C2227/0309—Heat exchange with the fluid by heating using another fluid
- F17C2227/0316—Water 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
- 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
- F17C2227/0367—Localisation of heat exchange
- F17C2227/0388—Localisation of heat exchange separate
- F17C2227/039—Localisation of heat exchange separate on the pipes
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention provides a kind of BOG recoverying and utilizing method of LNG gasification station storage tank and systems, and in method, a position is selected on LNG liquid feeding pipeline as BOG access point；BOG recovery pipe is converged to the BOG access point；BOG discharge threshold is set, when the BOG pressure in storage tank is greater than the discharge threshold, opens BOG recovery pipe, the BOG in storage tank is made to import LNG liquid feeding pipeline via BOG recovery pipe and convey outward；When the BOG pressure in storage tank is less than the discharge threshold, BOG recovery pipe is closed, the BOG in storage tank stops conveying outward.System and method for the difference is that, BOG access point constitutes BOG interface in LNG liquid feeding pipeline, and the position of the BOG interface is higher than the liquid level face of storage tank.BOG in storage tank of the present invention passes through BOG access point（That is BOG interface position）It imports in LNG liquid feeding pipeline, realizes the effective recycling of BOG.
Description
Technical field
The present invention relates to a kind of LNG gasification stations, and in particular, to a kind of recycling side small-sized LNG gasification station storage tank BOG
Method and system.
Background technique
Conventional Large LNG gasification station is relatively more due to the BOG amount of generation, it will usually independent BOG recovery system be arranged.
The BOG recovery system includes decompression regulating valve, BOG heater, BOG recuperator, BOG regulator etc..Through the BOG recovery system
Treated, and gas enters back into that gas supply main line measured plus smelly and can finally be provided to user.
And for small-sized LNG gasification station, the BOG amount of generation is fewer, and a set of BOG recycling system is arranged if increased
System, equipment cost is relatively high, does not have economy.If being not provided with recovery system, once storage tank superpressure, BOG can only pass through
Manual or safe release form is discharged into atmosphere, not only waste of resource, but also pollution environment.
Summary of the invention
In order to solve the above-mentioned technical problem, the invention reside in providing a kind of LNG gasification station storage tank BOG recycling system,
To solve the above problem in the prior art.
In view of the above technical problems, the present invention proposes that a kind of BOG recoverying and utilizing method of LNG gasification station storage tank, storage tank are set
The LNG liquid feeding pipeline for being equipped with conveying liquid medium outward is returned with the BOG for being connected to storage tank gas-phase space and conveying gas phase media outward
Closed tube road, including：A position is selected on LNG liquid feeding pipeline as BOG access point；BOG recovery pipe is converged to the BOG and is accessed
Point；BOG discharge threshold is set, when the BOG pressure in storage tank is greater than the discharge threshold, BOG recovery pipe is opened, makes in storage tank
BOG via BOG recovery pipe import LNG liquid feeding pipeline and convey outward；When the BOG pressure in storage tank is less than the discharge threshold
When, BOG recovery pipe is closed, the BOG in storage tank stops conveying outward.
In a preferred approach, BOG access point is set in the position in the LNG liquid level face of LNG liquid feeding pipeline being higher than in storage tank
It sets.
In a preferred approach, self-operated type dropping valve is set in BOG recovery pipe, the self-operated type dropping valve is set
BOG discharge threshold makes it control the opening and closing of BOG recovery pipe.
In a preferred approach, the shape for designing LNG liquid feeding pipeline, can be followed by when medium being made to flow through LNG liquid feeding pipeline
Fluid uplink pipeline segmentation from bottom to top, contour horizontal pipeline segmentation and top-down fluid downlink pipeline segmentation,
BOG access point is arranged in any position of horizontal pipeline segmentation.
The present invention also provides a kind of BOG recycling systems of LNG gasification station storage tank comprising：Storage tank, LNG liquid supply pipe
Road and BOG recovery pipe, the LNG liquid feeding pipeline and the BOG recovery pipe are gentle with the liquid Space of the storage tank respectively
Phase space connection；BOG interface is provided on the LNG liquid feeding pipeline, the BOG recovery pipe is connected to the BOG interface and leads to
Cross LNG liquid feeding pipeline described in the BOG orifice；The position of the BOG interface is higher than the LNG liquid level face in the storage tank；
The valve that control BOG recovery pipe opens and closes is provided in the BOG recovery pipe.
In a preferred approach, the position of the BOG interface is higher than the top of the storage tank.
In a preferred approach, the valve is self-operated type dropping valve；The self-operated type dropping valve has one to open preset value
Preset value is closed with one；When the BOG pressure in the storage tank is higher than the opening preset value, the self-operated type dropping valve can be certainly
It is dynamic to open, the BOG in the storage tank is imported into the LNG liquid feeding pipeline through the BOG recovery pipe and is conveyed outward；When described
When BOG pressure in storage tank is lower than the closing preset value, the self-operated type dropping valve be can be automatically closed, and cutting BOG is outside
Conveying.
In a preferred approach, the LNG liquid feeding pipeline includes：First liquid feeding pipeline segmentation, the second liquid feeding pipeline segmentation and
Horizontal liquid feeding pipeline segmentation, the first liquid feeding pipeline segmentation and the segmentation of the second liquid feeding pipeline are arranged to short transverse, described
Horizontal liquid feeding pipeline segmentation is connected between the first liquid feeding pipeline segmentation and the top of the second liquid feeding pipeline segmentation；The water
The position of flat liquid feeding pipeline segmentation is higher than the liquid level face of the storage tank.
In a preferred approach, the first liquid feeding pipeline segmentation and the segmentation of the second liquid feeding pipeline are arranged along the vertical direction, with
The first liquid feeding pipeline segmentation, the segmentation of the second liquid feeding pipeline and the segmentation of horizontal liquid feeding pipeline is set to generally comprise zigzag shape structure.
In a preferred approach, the top of the first liquid feeding pipeline segmentation and the segmentation of the second liquid feeding pipeline is above the storage
The top of tank, and the BOG interface is located at any position of the horizontal liquid feeding pipeline segmentation.
In a preferred approach, the BOG interface is located at the horizontal liquid feeding pipeline segmentation and first liquid feeding pipeline point
The position of section docking.
In a preferred approach, the downstream on the LNG liquid feeding pipeline and positioned at the BOG interface position is equipped with so that described
Medium and surrounding air in LNG liquid feeding pipeline carry out the air temperature gasifier of heat exchange；The downstream of the air temperature gasifier is equipped with
Adjusting the pressure medium in pipeline to the regulator of setting pressure limit；The downstream of the regulator is equipped with based on
Measure the flowmeter of rate-of flow；The downstream of the flowmeter is equipped with the device for adding odor that stink is added into pipeline.
In a preferred approach, it is also set on the LNG liquid feeding pipeline between the air temperature gasifier and the regulator
There is the water-bath recuperator for carrying out heat exchange again to the pipeline internal medium.
Compared with prior art, the invention has the advantages that：LNG gasification station storage tank BOG of the present invention is recycled
Method and system on LNG liquid feeding pipeline by setting BOG access point, i.e. BOG interface, and under the action of liquid level static pressure difference, BOG
The BOG of recycling in recovery pipe can be imported automatically in LNG liquid feeding pipeline, realized the effective recycling of BOG, avoided
A set of BOG recovery system is arranged in small-sized LNG gasification station, and whole system structure is simple, on the basis of guaranteeing downstream air demand, greatly
Reduce equipment cost greatly.
Detailed description of the invention
Fig. 1 is the BOG recycling system structural schematic diagram at the present embodiment LNG gasification station.
The reference numerals are as follows：2, storage tank；H, LNG liquid level face；21, liquid outlet；22, gas phase mouth；3, LNG liquid supply pipe
Road；4, BOG recovery pipe；31, the first liquid feeding pipeline is segmented；32, horizontal liquid feeding pipeline segmentation；33, the second liquid feeding pipeline is segmented；
A, BOG interface；5, self-operated type dropping valve；6, air temperature gasifier；7, water-bath recuperator；8, regulator；9, flowmeter；10, add
Smelly device.
Specific embodiment
The exemplary embodiment for embodying feature of present invention and advantage will describe in detail in the following description.It should be understood that
The present invention can have various variations in different embodiments, neither depart from the scope of the present invention, and theory therein
Bright and diagram inherently is illustrated as being used, rather than to limit the present invention.
The present invention is described in further detail with reference to the accompanying drawings and examples.
Present invention is generally directed to the storage tank BOG recoverying and utilizing methods and system of the design of small-sized LNG gasification station.
The present embodiment provides a kind of BOG recoverying and utilizing method of LNG gasification station storage tank, storage tank is provided with conveying liquid outward
The LNG liquid feeding pipeline of medium conveys the BOG recovery pipe of gas phase media with storage tank gas-phase space is connected to outward, including：
A position is selected on LNG liquid feeding pipeline as BOG access point.
BOG recovery pipe is converged to the BOG access point.
BOG discharge threshold is set, when the BOG pressure in storage tank is greater than the discharge threshold, BOG recovery pipe is opened, makes
BOG in storage tank imports LNG liquid feeding pipeline via BOG recovery pipe and conveys outward；When the BOG pressure in storage tank is less than the row
When putting threshold value, BOG recovery pipe is closed, the BOG in storage tank stops conveying outward.
BOG in storage tank is imported LNG liquid feeding pipeline by the present embodiment LNG gasification station storage tank BOG recoverying and utilizing method, with
Downstream user conveys gas supply to the mixing of LNG liquid feeding pipeline together, reaches and preferentially recycles and be the BOG being discharged in storage tank
The purpose of storage tank decompression, while BOG outlet is also reduced, environment is avoided pollution, cost has been saved.
More preferably, BOG access point is set in the position in the LNG liquid level face of LNG liquid feeding pipeline being higher than in storage tank, with benefit
With the effect of the LNG liquid static pressure flowed in LNG liquid feeding pipeline, BOG can be imported automatically in BOG recovery pipe, and and LNG
Downstream user is supplied after LNG mixing in liquid feeding pipeline.
Self-operated type dropping valve is set in BOG recovery pipe in the BOG recoverying and utilizing method of the present embodiment, self-operated type is dropped
Pressure valve sets BOG discharge threshold, it is made to control the opening and closing of BOG recovery pipe, is conducive to when storage tank internal pressure increases
BOG is carried out using recycling, maintains the service pressure in storage tank, so that guaranteeing is that gas supply is stablized in downstream.
It should be noted that the unlatching of BOG recovery pipe refer to the BOG in storage tank can be imported through BOG recovery pipe to
In LNG liquid feeding pipeline；And the closing of BOG recovery pipe refers to that the BOG in storage tank can not be imported through BOG recovery pipe to LNG
In liquid feeding pipeline.
Further, the shape for designing LNG liquid feeding pipeline, can be followed by under when medium being made to flow through LNG liquid feeding pipeline
Fluid uplink pipeline segmentation on and, contour horizontal pipeline segmentation and top-down fluid downlink pipeline segmentation, by BOG
Any position of horizontal pipeline segmentation is arranged in access point.More preferably, by access point design in fluid uplink pipeline segmentation and water
The position of flat pipeline segmentation docking, so that pipeline is laid more neatly, rationally.
Refering to fig. 1, the present embodiment also provides a kind of to realize above-mentioned LNG gasification station storage tank BOG recoverying and utilizing method
LNG gasification station storage tank BOG recycling system, the system include：Storage tank 2, LNG liquid feeding pipeline 3 and BOG recovery pipe 4.LNG
Liquid feeding pipeline 3 and BOG recovery pipe 4 are connected to the liquid Space of storage tank 2 and gas-phase space respectively.It is arranged on LNG liquid feeding pipeline 3
There is BOG interface a, BOG recovery pipe 4 to be connected to BOG interface a and LNG liquid feeding pipeline 3 is connected to by BOG interface a.BOG interface a's
Position is higher than the LNG liquid level face h in storage tank 2.It is provided with what control BOG recovery pipe 4 opened and closed in BOG recovery pipe 4
Valve.
In the BOG recycling system of the present embodiment LNG gasification station storage tank, the BOG in storage tank 2 is through BOG recovery pipe 4
There is BOG static pressure when discharge（P1）；And the LNG in the BOG interface a on LNG liquid feeding pipeline 3 is higher than the LNG liquid level face h of storage tank 2,
Under the action of liquid level static pressure difference, LNG static pressure in LNG liquid feeding pipeline 3（P2）The BOG that can be slightly below in BOG recovery pipe 4 is quiet
Pressure（P1）, thus the BOG in storage tank 2 can supply downstream automatically into LNG liquid feeding pipeline 3, and with BOG and LNG gas-liquid mixed
User has reached the preferential BOG using recycling, and has been reached for the purpose of the decompression of storage tank 2.
Next, the structure of the present embodiment storage tank 2, LNG liquid feeding pipeline 3 and BOG recovery pipe 4 is discussed in detail in conjunction with Fig. 1
And connection relationship.
For installing LNG in storage tank 2, lower end is equipped with liquid outlet 21, and the upper end is equipped with gas phase mouth 22.
LNG liquid feeding pipeline 3 is connect from the outside of storage tank 2 with liquid outlet 21, and is connected to the liquid medium inside storage tank 2,
To export the LNG liquid in storage tank 2, and downstream user is supplied through LNG liquid feeding pipeline 3.
In the present embodiment, LNG liquid feeding pipeline 3 includes：First liquid feeding pipeline is segmented the 31, second liquid feeding pipeline and is segmented 33 and
Horizontal liquid feeding pipeline segmentation 32.The segmentation 31 of first liquid feeding pipeline and the second liquid feeding pipeline segmentation 33 are arranged along the vertical direction, water
Flat liquid feeding pipeline segmentation 32 is connected to the segmentation 31 of the first liquid feeding pipeline and the second liquid feeding pipeline is segmented between 33 tops.Wherein,
The top of the segmentation 31 of one liquid feeding pipeline and the second liquid feeding pipeline segmentation 33 is above the top of storage tank 2, that is to say, that horizontal feed flow
The position of pipeline segmentation 32 is higher than the top of storage tank 2.First liquid feeding pipeline segmentation 31, horizontal liquid feeding pipeline segmentation 32 and second supply
Liquid pipeline segmentation 33 generally comprises zigzag shape structure.Liquid medium in storage tank 2 conveys outward, and liquid medium passes through the zigzag shape
When the pipeline segmentation of structure, the first liquid feeding pipeline segmentation 31 is first passed through, using horizontal liquid feeding pipeline segmentation 32, finally by the
Two liquid feeding pipelines segmentation 33, so that the first liquid feeding pipeline segmentation 31 constitutes fluid uplink pipeline segmentation, the segmentation of the second liquid feeding pipeline
33 constitute fluid downlink pipeline segmentation.
In other embodiments, the segmentation 31 of the first liquid feeding pipeline and the second liquid feeding pipeline segmentation 33 are also possible to non-vertical set
It sets, is only arranged to short transverse.
In other embodiments, the position on the top of the segmentation 31 of the first liquid feeding pipeline and the second liquid feeding pipeline segmentation 33 is unlimited
In the top for being higher than storage tank 2, the position on top need to be higher than LNG liquid level face h in storage tank 2.
In the present embodiment, the position of BOG interface a is located at the segmentation 32 of horizontal liquid feeding pipeline and the first liquid feeding pipeline is segmented 31 pairs
The position connect is higher than the top of storage tank 2.
In embodiment, the position of BOG interface a may be located on any position of horizontal liquid feeding pipeline segmentation 32, or
It is higher than any position of LNG liquid level face h in storage tank 2 in person, the segmentation 31 of the first liquid feeding pipeline and the second liquid feeding pipeline segmentation 33.
Further, air temperature gasifier is successively arranged on the LNG liquid feeding pipeline 3 that the second liquid feeding pipeline is segmented 33 downstreams
6, water-bath recuperator 7, regulator 8, flowmeter 9 and device for adding odor 10.
It should be noted that air temperature gasifier 6, water-bath recuperator 7, regulator 8, flowmeter 9 and device for adding odor 10 are also
It can be set in the LNG liquid feeding pipeline 3 in the downstream of the position BOG interface a.
Air temperature gasifier 6 passes through the effect of radiating fin thereon, by the LNG medium in LNG liquid feeding pipeline 3（Liquid medium
And/or BOG gas phase）Heat exchange is carried out with the air to circulate in environment and forms natural gas.When ambient air temperature is too low, from air temperature
The temperature for the natural gas that gasifier 6 comes out can be lower than -20 DEG C, and the gas of such low temperature enters the pipe of regulator 8 and flowmeter 9
Road will cause great security risk, and water-bath recuperator 7 can pass through the hot water and pipeline internal medium in it（I.e. low temperature is natural
Gas）It exchanges heat, the natural gas is made to reach normal temperature state.Regulator 8 is with by the medium in pipeline（Natural gas）For air pressure
Power is adjusted to setting pressure limit, the i.e. pressure limit of downstream user needs.Flowmeter 9 is used for metered media（Natural gas）Stream
Amount settles accounts the natural gas of output with business.Device for adding odor 10 issues early warning with the leakage that may occur in natural gas, correspondingly,
The device for adding odor 10 being capable of the interior addition stink agent into LNG liquid feeding pipeline 3（Thiophane）, when there is gas leakage, work
Personnel can discover in time and make emergency reaction.
In actual use, under conditions of environment temperature allows, the temperature of the natural gas after 6 heat exchange of air temperature gasifier
When degree will not damage regulator 8 and flowmeter 9, water-bath recuperator 7 can be omitted setting.
BOG recovery pipe 4 is connect from the outside of storage tank 2 with gas phase mouth 22, and is connected to the gas-phase space in storage tank 2.BOG
There is recovery end, which is connected to the BOG interface a of LNG liquid feeding pipeline 3, i.e. the first liquid feeding pipeline segmentation in recovery pipe 4
31 and horizontal liquid feeding pipeline segmentation 32 docking positions so that BOG recovery pipe 4 is connected to LNG liquid feeding pipeline 3.
Further, in this embodiment valve is self-operated type dropping valve 5, which, which has, opens preset value
0.7MPa and closing preset value 0.5MPa.When the BOG pressure in storage tank 2 is more than to open preset value 0.7MPa, self-operated type decompression
Valve 5 automatically opens, and the BOG in storage tank 2 is imported in LNG liquid feeding pipeline 3 via BOG recovery pipe 4 and conveyed outward, with BOG and
LNG gas-liquid mixed supplies downstream user, realizes the recycling of BOG.When the BOG pressure in storage tank 2 is lower than closing preset value
When 0.5MPa, self-operated type dropping valve 5 is automatically closed, and cutting BOG is conveyed outward, so that the guarantee of maintenance certain pressure is in storage tank 2
Stablize gas supply in downstream.
In actual use, the opening preset value of self-operated type dropping valve 5 and closing preset value can be according to the reality of storage tank 2
Specification determines.
BOG recovery pipe 4 is additionally provided with the discharge end being communicated with the atmosphere（It is not shown in the figure）, so that LNG gasification station is in non-work
When making state, the BOG generated in storage tank 2 is discharged to reduce the pressure in storage tank 2, guarantees the normal pressure of storage tank 2.
LNG gasification station storage tank BOG recycling system of the present invention on LNG liquid feeding pipeline by setting BOG interface, and in liquid
Under the action of the static pressure difference of position, the BOG of the recycling in BOG recovery pipe can be imported automatically in LNG liquid feeding pipeline, realize BOG's
Effective recycling avoids and a set of BOG recovery system is arranged at small-sized LNG gasification station, and whole system structure is simple, is guaranteeing
On the basis of the air demand of downstream, equipment cost is greatly reduced.
Although describing the present invention with reference to the above exemplary embodiment, it is to be understood that, term used be explanation and
Term exemplary, and not restrictive.Due to the present invention can be embodied in a variety of forms without departing from invention spirit or
Essence, it should therefore be appreciated that above embodiment is not limited to any of the foregoing details, and should be defined by the appended claims
The whole change and modification widely explained, therefore fallen into claim or its equivalent scope in spirit and scope all should be with
Attached claim is covered.
Claims (13)
1. a kind of BOG recoverying and utilizing method of LNG gasification station storage tank, storage tank is provided with the LNG feed flow of conveying liquid medium outward
Pipeline conveys the BOG recovery pipe of gas phase media with storage tank gas-phase space is connected to outward, which is characterized in that including：
A position is selected on LNG liquid feeding pipeline as BOG access point；
BOG recovery pipe is converged to the BOG access point；
BOG discharge threshold is set, when the BOG pressure in storage tank is greater than the discharge threshold, BOG recovery pipe is opened, makes storage tank
Interior BOG imports LNG liquid feeding pipeline via BOG recovery pipe and conveys outward；When the BOG pressure in storage tank is less than the discharge threshold
When value, BOG recovery pipe is closed, the BOG in storage tank stops conveying outward.
2. BOG recoverying and utilizing method as described in claim 1, which is characterized in that BOG access point is set in LNG liquid supply pipe
The position in the LNG liquid level face being higher than in storage tank on road.
3. BOG recoverying and utilizing method as described in claim 1, which is characterized in that self-operated type is arranged in BOG recovery pipe and drops
Pressure valve sets BOG discharge threshold to the self-operated type dropping valve, it is made to control the opening and closing of BOG recovery pipe.
4. BOG recoverying and utilizing method as described in claim 1, which is characterized in that the shape of design LNG liquid feeding pipeline makes to be situated between
Mass flow through when LNG liquid feeding pipeline can followed by from bottom to top fluid uplink pipeline segmentation, the segmentation of contour horizontal pipeline with
And top-down fluid downlink pipeline segmentation, BOG access point is arranged in any position of horizontal pipeline segmentation.
5. a kind of BOG recycling system of LNG gasification station storage tank, which is characterized in that including：Storage tank, LNG liquid feeding pipeline and
BOG recovery pipe, the LNG liquid feeding pipeline and the BOG recovery pipe are empty with the liquid Space of the storage tank and gas phase respectively
Between be connected to；
BOG interface is provided on the LNG liquid feeding pipeline, the BOG recovery pipe is connected to the BOG interface and by described
LNG liquid feeding pipeline described in BOG orifice；The position of the BOG interface is higher than the LNG liquid level face in the storage tank；
The valve that control BOG recovery pipe opens and closes is provided in the BOG recovery pipe.
6. BOG recycling system as claimed in claim 5, which is characterized in that the position of the BOG interface is higher than the storage
The top of tank.
7. BOG recycling system as claimed in claim 5, which is characterized in that the valve is self-operated type dropping valve；It is described
Self-operated type dropping valve has one to open preset value and a closing preset value；
When the BOG pressure in the storage tank is higher than the opening preset value, the self-operated type dropping valve can be automatically opened, by institute
The BOG stated in storage tank imports the LNG liquid feeding pipeline through the BOG recovery pipe and conveys outward；BOG in the storage tank
When pressure is lower than the closing preset value, the self-operated type dropping valve be can be automatically closed, and cutting BOG is conveyed outward.
8. BOG recycling system as claimed in claim 5, which is characterized in that the LNG liquid feeding pipeline includes：First supplies
Liquid pipeline segmentation, the segmentation of the second liquid feeding pipeline and the segmentation of horizontal liquid feeding pipeline, the first liquid feeding pipeline segmentation and the second feed flow
Pipeline segmentation is arranged to short transverse, and the horizontal liquid feeding pipeline segmentation is connected to the first liquid feeding pipeline segmentation and second
Between the top of liquid feeding pipeline segmentation；The position of the horizontal liquid feeding pipeline segmentation is higher than the liquid level face of the storage tank.
9. BOG recycling system as claimed in claim 8, which is characterized in that the first liquid feeding pipeline segmentation and second
Liquid feeding pipeline segmentation is arranged along the vertical direction, so that first liquid feeding pipeline segmentation, the segmentation of the second liquid feeding pipeline and horizontal confession
Liquid pipeline segmentation generally comprises zigzag shape structure.
10. BOG recycling system as claimed in claim 8, which is characterized in that the first liquid feeding pipeline segmentation and second
The top of liquid feeding pipeline segmentation is above the top of the storage tank, and the BOG interface is located at the horizontal liquid feeding pipeline segmentation
Any position.
11. BOG recycling system as claimed in claim 10, which is characterized in that the BOG interface is located at the horizontal confession
The position of liquid pipeline segmentation and first liquid feeding pipeline segmentation docking.
12. BOG recycling system as claimed in claim 5, which is characterized in that on the LNG liquid feeding pipeline and be located at institute
The downstream for stating BOG interface position is equipped with so that medium and surrounding air in the LNG liquid feeding pipeline carry out the air temperature of heat exchange
Gasifier；The downstream of the air temperature gasifier is equipped with to be filled with the pressure regulation for adjusting the pressure medium in pipeline to setting pressure limit
It sets；The downstream of the regulator is equipped with the flowmeter for metered media flow；The downstream of the flowmeter is equipped with to pipeline
The device for adding odor of interior addition stink.
13. BOG recycling system as claimed in claim 12, which is characterized in that the air temperature gasifier and the pressure regulation
The water-bath re-heat for carrying out heat exchange again to the pipeline internal medium is additionally provided on the LNG liquid feeding pipeline between device
Device.
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| CN201710316472.1A CN108870070A (en) | 2017-05-08 | 2017-05-08 | The BOG recoverying and utilizing method and system of LNG gasification station storage tank |
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| CN201710316472.1A CN108870070A (en) | 2017-05-08 | 2017-05-08 | The BOG recoverying and utilizing method and system of LNG gasification station storage tank |
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| WO2021031196A1 (en) * | 2019-08-22 | 2021-02-25 | 中集船舶海洋工程设计研究院有限公司 | Lng fuel gas supply system and ship |
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