CN106287219A - A kind of natural gas liquefaction plant BOG recycling system - Google Patents
A kind of natural gas liquefaction plant BOG recycling system Download PDFInfo
- Publication number
- CN106287219A CN106287219A CN201610850805.4A CN201610850805A CN106287219A CN 106287219 A CN106287219 A CN 106287219A CN 201610850805 A CN201610850805 A CN 201610850805A CN 106287219 A CN106287219 A CN 106287219A
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- Prior art keywords
- bog
- lng
- natural gas
- gas liquefaction
- liquefaction plant
- Prior art date
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000003345 natural gas Substances 0.000 title claims abstract description 37
- 238000004064 recycling Methods 0.000 title claims abstract description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 19
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 abstract description 13
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000002309 gasification Methods 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 abstract description 5
- 230000009977 dual effect Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003949 liquefied natural gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
- F25J1/0025—Boil-off gases "BOG" from storages
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0221—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
-
- 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
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0341—Heat exchange with the fluid by cooling 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
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/035—Dealing with losses of 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
- 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
- F17C2265/033—Treating the boil-off by recovery with cooling
- F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/42—Nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/62—Separating low boiling components, e.g. He, H2, N2, Air
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention proposes a kind of natural gas liquefaction plant BOG recycling system, by arranging knockout drum and heat exchanger, BOG is without liquefying through compressor for major part, therefore less energy intensive, automatic back flow LNG storage tank under the LNG after liquefaction pressure in knockout drum and gravity dual function, without using cryopump, more energy-conservation, low cost；Liquid nitrogen and BOG carry out heat exchange, and the nitrogen of partial gasification still has the biggest cold, enter the recycling of natural gas liquefaction plant main heat exchanger, save cold；Small part residual BOG after heat exchange is liquefied enters compression BOG recycling can after compressor compresses, and again liquefies for natural gas liquefaction plant, avoids waste.
Description
Technical field
The present invention relates to liquefied natural gas field, particularly relate to a kind of natural gas liquefaction plant BOG recycling system.
Background technology
Natural gas liquefaction plant is the natural gas of gaseous state to be cooled to about-160 DEG C become liquid, the natural gas after liquefaction
(LNG) it is stored in Large Atmosphere Pressure LNG low-temperature storage tank, the Insulation that low-temperature storage tank employing is certain, but any Insulation
All cannot be the most heat insulation, the LNG in storage tank can draw external heat the most on a small quantity, and LNG is heated, and some liquid is waved again
Sending out into gaseous state, this portion gas is referred to as the natural gas that BOG, BOG are gaseous states, for maintaining the atmospheric pressure state of LNG storage tank, this part
BOG must outer arrange, and how the BOG of outer row re-uses, and takes various method, the most directly use compressor compresses in industry
To high pressure CNG, use compressor and pump to combine and again BOG is liquefied as the methods such as defeated time storage tank of LNG.
China Patent No. CN201510424700.8 provides a kind of LNG and receives terminal BOG recovery and treatment method and system,
It arranges LNG and receives terminal BOG recovery and processing system, including pump, BOG after-condenser, LNG in LNG full-capacity tank, LNG tank
Female tank, BOG compressor, outer defeated loading system, the first regulation valve, the second regulation valve, the 3rd regulation valve and the 4th regulation valve；LNG
The BOG produced in full-capacity tank initially enters BOG compressor, and BOG compressor carries out supercharging to the BOG entered, and makes BOG pressure carry
High after 0.5MPaG～0.8MPaG, enter BOG after-condenser lower end；Supercool LNG pump in LNG tank in LNG full-capacity tank
It is delivered to BOG after-condenser upper end, sprays downwards from the upper end of BOG after-condenser, direct with the BOG of BOG after-condenser lower end
Transmission of heat by contact so that BOG is condensed and forms LNG；LNG in BOG after-condenser enters the LNG primary and secondary of storage with pressure through pipeline
Tank, the LNG in LNG primary and secondary tank travels further into outer defeated loading system；Wherein, this pipeline is provided with the first regulation valve, uses
In controlling the LNG stream amount of outflow from BOG after-condenser；BOG after-condenser, LNG primary and secondary tank and outer defeated loading system produce
BOG carry out throttling after control by the second regulation valve, the 3rd regulation valve and the 4th regulation valve respectively, and in LNG full-capacity tank
The BOG produced enters BOG compressor together, and BOG compressor carries out supercharging to the BOG entered, and makes BOG pressure bring up to
After 0.5MPaG～0.8MPaG, enter BOG after-condenser lower end.
System above employs pump in LNG tank, needs to consume electric energy, and once pump breaks down, and keeps in repair extremely complex；Should
System employs compressor, by all BOG through compressor compresses, consumes much electricity；This system utilizes LNG tank inner bottom part
The cold of LNG liquefies BOG, and the temperature of such LNG can raise, and LNG is more easy to gasification and becomes BOG, and this is for LNG long term storage not
Profit.
Summary of the invention
In view of this, the present invention proposes a kind of power saving, is easy to the natural gas liquefaction plant BOG recycling of longer-term storage
System.
The technical scheme is that and be achieved in that: a kind of natural gas liquefaction plant BOG recycling system, including
LNG storage tank, knockout drum, heat exchanger, compressor, compression BOG recycling can, nitrogen storage tank and natural gas liquefaction plant master change
Hot device, LNG storage tank offers BOG outlet and LNG entrance, knockout drum offers BOG entrance and top and bottom is divided
Not offering BOG recovery port and LNG outlet, BOG outlet connects with BOG entrance, and LNG outlet connects with LNG entrance, and BOG reclaims
Mouth connects with compressor, and compressor connection compression BOG recycling can, heat exchanger is arranged at knockout drum two ends and is respectively communicated with liquid nitrogen
Holding vessel and natural gas liquefaction plant main heat exchanger.
On the basis of above technical scheme, it is preferred that be provided with the first regulation valve between BOG outlet and BOG entrance.
On the basis of above technical scheme, it is preferred that be provided with the second regulation valve between LNG outlet and LNG entrance.
On the basis of above technical scheme, it is preferred that be provided with the 3rd tune between described heat exchanger and nitrogen storage tank
Joint valve.
On the basis of above technical scheme, it is preferred that between described heat exchanger and natural gas liquefaction plant main heat exchanger
It is provided with the 4th regulation valve.
On the basis of above technical scheme, it is preferred that be provided with spray head in LNG storage tank, spray head is with LNG entrance even
Logical.It is further preferred that the height fall that described spray head and LNG export is more than 10 meters.
The natural gas liquefaction plant BOG recycling system of the present invention has the advantages that relative to prior art
(1) by arranging knockout drum and heat exchanger, BOG is without liquefying through compressor for major part, therefore consumes energy
Less, automatic back flow LNG storage tank under pressure in knockout drum of LNG after liquefaction and gravity dual function, it is not necessary to use
Cryopump, more energy-conservation, low cost；
(2) liquid nitrogen and BOG carry out heat exchange, and the nitrogen of partial gasification still has the biggest cold, enter natural gas liquid chemical industry
Factory owner's heat exchanger reuses, and saves cold；
(3) the small part residual BOG after heat exchange is liquefied enters compression BOG recycling can, for natural after compressor compresses
Gas liquefaction factory liquefies again, avoids waste.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the annexation schematic diagram of natural gas liquefaction plant BOG recycling system of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in embodiment of the present invention, the technical scheme in embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole realities
Execute mode.Based on the embodiment in the present invention, those of ordinary skill in the art are institute under not making creative work premise
The every other embodiment obtained, broadly falls into the scope of protection of the invention.
With reference to Fig. 1, the natural gas liquefaction plant BOG recycling system of the present invention, including LNG storage tank 1, knockout drum
2, heat exchanger 3, compressor 4, compression BOG recycling can 5, nitrogen storage tank 6 and natural gas liquefaction plant main heat exchanger 7.
LNG storage tank 1, stores LNG, and part LNG gasification is liquefied as LNG through the recovery system of the present invention after becoming BOG and refluxes
LNG storage tank 1.Concrete, LNG storage tank 1 offering BOG and exports 11 and LNG entrances 12, BOG is through BOG outlet 11 eliminating, liquefaction
LNG is become to reflux LNG storage tank 1 through LNG entrance 12 again.Concrete, it is provided with spray head 13, spray head 13 and LNG in LNG storage tank 1
Entrance 12 connects.
Knockout drum 2, built-in heat exchanger 3, BOG carries out heat friendship in knockout drum 2 with the liquid nitrogen in heat exchanger 3
Changing, thus major part BOG is liquefied as LNG again, the LNG after liquefaction is deposited on bottom knockout drum 2 under gravity,
Flow back into LNG storage tank 1 again；A small amount of BOG enters compression BOG recycling can 5 after compressor compresses, for natural gas liquefaction plant
Again liquefy, avoid waste.Concrete, knockout drum 2 offers BOG entrance 21 and top and bottom offers respectively
BOG recovery port 22 and LNG outlet 23, BOG outlet 11 connects with BOG entrance 21, and LNG outlet 23 connects with LNG entrance 12, BOG
Recovery port 22 connects with compressor 4.More specifically, it is provided with the first regulation valve 81 between BOG outlet 11 and BOG entrances 21.As
This, can enter the BOG flow of knockout drum 2 by the first regulation valve 81 regulation.More specifically, LNG outlet 23 and LNG entrance
The second regulation valve 82 it is provided with between 12.So, the LNG stream amount of LNG storage tank 1 can be entered by the second regulation valve 82 regulation.?
In the present invention, described spray head 13 is more than 10 meters with the height fall of LNG outlet 23.Concrete, LNG outlet 23 enters with LNG
Pipeline between mouth 12 uses vacuum thermal-insulating pipeline.So, can improve LNG outlet 23 connect with LNG entrance 12 between LNG liquid
Column pressure, in the case of this makes not use pump or compressor power consumption, in liquid dependence gravity reflux to LNG storage tank 1.
Heat exchanger 3, interior logical circulating liquid nitrogen.Concrete, its two ends are respectively communicated with nitrogen storage tank 6 and natural gas liquefaction plant
Main heat exchanger 7.So, after heat exchange, the nitrogen of partial gasification still has the biggest cold, enters natural gas liquefaction plant master
Heat exchanger 7 reuses, and saves cold.More specifically, it is provided with the 3rd regulation between described heat exchanger 3 and nitrogen storage tank 6
Valve 83.The 4th regulation valve 84 it is provided with between described heat exchanger 3 and natural gas liquefaction plant main heat exchanger 7.So, can be by the
Three regulation valves 83 and the 4th regulation valve 84 regulate liquid nitrogen flow, control the temperature in knockout drum 2.
Compressor 4 connection compression BOG recycling can 5, liquefies for natural gas liquefaction plant again to the BOG gas after compression,
Avoid waste.
Introduce the natural gas liquefaction plant BOG recycling system of the invention of the present invention briefly below:
Step one, the BOG in LNG storage tank 1 enters knockout drum 2 through the first regulation valve 81, by the 3rd regulation valve 83
Circulating liquid nitrogen, the temperature in regulation knockout drum 2 is led to so that major part BOG liquid again with the 4th regulation valve 84 heat exchanger 3
Chemical conversion LNG；It is cold that the part nitrogen simultaneously gasified after heat exchanger 3 heat exchange is continuing with it through natural gas liquefaction plant main heat exchanger 7
Amount, avoids waste；
Step 2, the LNG after liquefaction is deposited on knockout drum 2, and the BOG constantly entered makes knockout drum 2 internal
There is pressure, under the dual function of gravity, the LNG after liquefaction reclaims profit in the second regulation valve 82 regulation enters LNG storage tank 1
With；
Step 3, the BOG of a small amount of residual is supplied to compress BOG recycling can 5 after compressor 4 compresses and again liquefies,
Avoid waste.
The foregoing is only the better embodiment of the present invention, not in order to limit the present invention, all the present invention's
Within spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (7)
1. a natural gas liquefaction plant BOG recycling system, it is characterised in that: include LNG storage tank (1), knockout drum
(2), heat exchanger (3), compressor (4), compression BOG recycling can (5), nitrogen storage tank (6) and natural gas liquefaction plant main heat exchange
Device (7), LNG storage tank (1) offers BOG and exports (11) and LNG entrance (12), and knockout drum offers BOG entrance on (2)
And top and bottom offer BOG recovery port (22) and LNG outlet (23), BOG outlet (11) and BOG entrance (21) respectively (21)
Connection, LNG outlet (23) connects with LNG entrance (12), and BOG recovery port (22) connects with compressor (4), and compressor (4) connects
Compression BOG recycling can (5), heat exchanger (3) is arranged at knockout drum (2) two ends and is respectively communicated with nitrogen storage tank (6) and natural
Gas liquefaction factory owner's heat exchanger (7).
2. natural gas liquefaction plant BOG recycling system as claimed in claim 1, it is characterised in that: BOG outlet (11) with
The first regulation valve (81) it is provided with between BOG entrance (21).
3. natural gas liquefaction plant BOG recycling system as claimed in claim 1, it is characterised in that: LNG outlet (23) with
The second regulation valve (82) it is provided with between LNG entrance (12).
4. natural gas liquefaction plant BOG recycling system as claimed in claim 1, it is characterised in that: described heat exchanger (3)
And it is provided with the 3rd regulation valve (83) between nitrogen storage tank (6).
5. natural gas liquefaction plant BOG recycling system as claimed in claim 1, it is characterised in that: described heat exchanger (3)
And it is provided with the 4th regulation valve (84) between natural gas liquefaction plant main heat exchanger (7).
6. natural gas liquefaction plant BOG recycling system as claimed in claim 1, it is characterised in that: in LNG storage tank (1)
Being provided with spray head (13), spray head (13) connects with LNG entrance (12).
7. natural gas liquefaction plant BOG recycling system as claimed in claim 6, it is characterised in that: described spray head
(13) height fall with LNG outlet (23) is more than 10 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610850805.4A CN106287219A (en) | 2016-09-26 | 2016-09-26 | A kind of natural gas liquefaction plant BOG recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610850805.4A CN106287219A (en) | 2016-09-26 | 2016-09-26 | A kind of natural gas liquefaction plant BOG recycling system |
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| CN106287219A true CN106287219A (en) | 2017-01-04 |
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| CN201610850805.4A Pending CN106287219A (en) | 2016-09-26 | 2016-09-26 | A kind of natural gas liquefaction plant BOG recycling system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838605A (en) * | 2017-02-09 | 2017-06-13 | 中国海洋石油总公司 | A kind of process and device for LNG receiving stations BOG systems |
| CN112902554A (en) * | 2021-02-02 | 2021-06-04 | 南通职业大学 | Natural gas evaporation gas recovery reliquefaction device |
| CN113446514A (en) * | 2021-06-26 | 2021-09-28 | 江苏锐深化工机械科技有限公司 | Flash evaporation gas liquefaction recovery system and method |
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| CN103759135A (en) * | 2014-01-09 | 2014-04-30 | 华南理工大学 | BOG (Boil Off Gas)-zero emission LNG (Liquefied Natural Gas) storage method and device |
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| CN113446514A (en) * | 2021-06-26 | 2021-09-28 | 江苏锐深化工机械科技有限公司 | Flash evaporation gas liquefaction recovery system and method |
| CN113446514B (en) * | 2021-06-26 | 2022-03-11 | 江苏锐深化工机械科技有限公司 | Flash evaporation gas liquefaction recovery system and method |
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