CN106838605B - A kind of process and device for LNG receiving stations BOG systems - Google Patents
A kind of process and device for LNG receiving stations BOG systems Download PDFInfo
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- CN106838605B CN106838605B CN201710071513.5A CN201710071513A CN106838605B CN 106838605 B CN106838605 B CN 106838605B CN 201710071513 A CN201710071513 A CN 201710071513A CN 106838605 B CN106838605 B CN 106838605B
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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
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
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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
- 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
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
-
- 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
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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
- 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
Abstract
The invention discloses a kind of processes and device for LNG receiving stations BOG systems, the device includes LNG storage tank, BOG compressors, liquid separation tank and liquid collection tank, the top of the LNG storage tank is connected to the upstream of BOG pipelines, and the downstream of BOG pipelines is respectively communicated with BOG manifold, returns gas pipeline and flare line；The outlet liquid separation tank of the BOG manifold, the import of the top exit pipeline connection BOG compressors of liquid separation tank, the outlet of BOG compressors remove after-condenser BOG pipelines.The technique of the present invention can completely isolated potential band liquid pipe line and the suctions port of compressor BOG pipeline, greatly improve the safety of BOG compressor operatings, also eliminate potential impact of the fluid column back pressure to heating power safety valve；Discharge pipe line is connected to LNG storage tank, is also conducive to the recycling of emptying gas；Meanwhile even if hydrops occurs in liquid separation tank in the suctions port of compressor BOG, it can also gasify under conditions of need not stop transport BOG compressors and eliminate hydrops, greatly improve the continuous operation stability of entire process system.
Description
Technical field
The present invention relates to LNG Technology fields, specifically a kind of technique for LNG receiving stations BOG systems
Method and device.
Background technology
LNG (Liquefied Natural Gas) is the abbreviation of liquefied natural gas, due to its clean energy, at present
It is greatly developing, the construction of wherein LNG receiving stations is like a raging fire at home.It is planned according to national energy, natural gas disappears in the energy
Ratio in expense rises year by year, it is contemplated that arrives 10% or so of the entire energy resource structure in the year two thousand twenty station.
Since heat source inputs, the generation of boil-off gas BOG (boil-off gas) is had in LNG receiving stations, in order to handle
BOG needs in receiving station that BOG system process is arranged.A kind of traditional technique is：BOG systems and all safety valves (including heating power
Safety valve), emptying, BOG compressors etc. be connected.There are some problems for this BOG system and process, such as：Heating power safety
Valve is due to itself characteristic, it is possible to leakage (there were similar situation in foreign countries) occurs, once leakage generates weight to BOG systems
It is big to influence and (influence BOG compressor operatings, influence torch emptying etc.).Another traditional handicraft is：Heating power safety valve is individually set
Outlet header is set, LNG storage tank is directly connected to.There are still problems for this technique, since its header needs about 40m ability of climbing
Into LNG storage tank, when heating power safety valve once occurs to reveal (heating power relief valve operation pressure ~ 1.0MPaG), pacify in heating power
Full valve outlet very likely generates the fluid-tight of 40m high, this is destructive to the operation of heating power safety valve, loses safety valve substantially
Effect, can not discharge superpressure.
Invention content
The technical assignment of the present invention is to provide a kind of process and device for LNG receiving stations BOG systems.
The technical assignment of the present invention realizes that the device includes LNG storage tank, BOG compressors, liquid separation tank in the following manner
And liquid collection tank, the top of the LNG storage tank are connected to the upstream of BOG pipelines, the downstream of BOG pipelines is respectively communicated with BOG
Manifold, gas pipeline and flare line are returned；The outlet liquid separation tank of the BOG manifold, the top exit pipeline of liquid separation tank
It is connected to the import of BOG compressors, the outlet of BOG compressors removes after-condenser BOG pipelines；
The import of the liquid collection tank is respectively communicated with nitrogen or pressure natural gas line and heating power safety valve and emptying
Pipeline；The outlet line of liquid collection tank is connected to LNG storage tank.
Top in the liquid collection tank is gas-phase space, and lower part is liquid Space；Gas-phase space respectively with nitrogen
Or the gaseous phase outlet connection of pressure natural gas line, liquid collection tank, liquid Space are connected to the liquid-phase outlet of liquid collection tank,
Gaseous phase outlet is mounted on the top of liquid collection tank and is connected to vapor delivery line；Liquid-phase outlet is mounted on the bottom of liquid collection tank simultaneously
It is connected to liquid phase pipeline；After the vapor delivery line and liquid phase pipeline is connected to triple valve one respectively, pass through pipeline and LNG storage tank
Inlet communication.
Triple valve two is installed, a way outlet of triple valve two passes through pipeline on the heating power safety valve and blow-down pipe
It is connected to the import of liquid collection tank, another way outlet of triple valve two is connected to BOG manifold by pipeline.
Lower part in the liquid collection tank is equipped with electric-heating belt.
Lower part in the liquid separation tank is equipped with gas distributor.
The gas distributor of lower part is connected to BOG compressor outlet by-pass lines, BOG compressor outlets in the liquid separation tank
The other end of by-pass line is connected to after-condenser BOG pipelines are removed.
Regulating valve two is installed on the BOG compressor outlet by-pass lines.
Torch liquid separation tank is installed on the flare line, is equipped on the flare line of torch liquid separation tank downstream direction
Regulating valve one.
A kind of the step of process for LNG receiving stations BOG systems, is as follows：
1）It is -150 that LNG storage tank temperature, which will be come from,oC~-140oThe BOG of C respectively enters BOG manifold, gas return tube line
And flare line；
2）Heating power safety valve and blow-down pipe are isolated by triple valve two with BOG manifold；
3）The downstream of heating power safety valve and blow-down pipe is connected to liquid collection tank, monitors heating power safety valve and blow-down pipe
Band liquid situation pass through pipeline and LNG after being connected to the vapor delivery line of liquid collection tank and liquid phase pipeline with triple valve one respectively
The inlet communication of storage tank；It needs the gas phase for closing triple valve one when drain to be connected to, opens liquid phase connection, open nitrogen or pressure day
Right gas pipeline realizes that drain enters LNG storage tank；
4）When liquid collection tank drain, the triple valve two of heating power safety valve and blow-down pipe is temporarily connected to BOG manifold, row
After the completion of liquid, restores triple valve two and be connected to liquid collection tank；
5）When liquid collection tank drain is not applicable, start electric-heating belt, the liquid in heating and gasifying liquid collection tank is sent
Enter LNG storage tank；
6）When liquid collection tank carries out drain, when there is hydrops in liquid separation tank, BOG compressor outlet by-pass lines are utilized
BOG after drainage pressurization enters liquid separation tank, exchanges heat, reaches with hydrops after the gas distributor dispersion inside it in liquid separation tank
Gasification, the purpose for eliminating hydrops.
The present invention a kind of process and device for LNG receiving stations BOG systems compared to the prior art, this technique
Can completely isolated potential band liquid pipe line and the suctions port of compressor BOG pipeline, greatly improve the safety of BOG compressor operatings,
Eliminate potential impact of the fluid column back pressure to heating power safety valve；Discharge pipe line is connected to LNG storage tank, is also conducive to returning for emptying gas
It receives and recycles；It, can also be in the condition of BOG compressors that need not stop transport meanwhile even if hydrops occurs in liquid separation tank in the suctions port of compressor BOG
Under, gasify and eliminate hydrops, greatly improves the continuous operation stability of entire process system.
Description of the drawings
Attached drawing 1 is a kind of structural schematic diagram of device for LNG receiving stations BOG systems.
In figure：1, BOG compressors, 2, remove after-condenser BOG pipelines, 3, liquid separation tank, 4, BOG manifold, 5, return gas pipeline, 6,
Flare line, 7, torch liquid separation tank, 8, BOG pipelines, 9, LNG storage tank, 10, triple valve one, 11, nitrogen or pressure natural gas tube
Line, 12, liquid collection tank, 13, triple valve two, 14, heating power safety valve and blow-down pipe, 15, regulating valve one, 16, electric-heating belt,
17, BOG compressor outlets by-pass line, 18, regulating valve two, 19, gas distributor.
Specific implementation mode
Embodiment 1：
It is configured to the device of LNG receiving stations BOG systems：
The device for being used for LNG receiving stations BOG systems includes that LNG storage tank 9, BOG compressors 1, liquid separation tank 3 and liquid are collected
The top of tank 12, the LNG storage tank 9 is connected to the upstream of BOG pipelines 8, the downstreams of BOG pipelines 8 be respectively communicated with BOG manifold 4,
Return gas pipeline 5 and flare line 6；Torch liquid separation tank 7,7 downstream direction of torch liquid separation tank are installed on the flare line 6
Flare line 6 on regulating valve 1 is installed.The outlet liquid separation tank 3 of the BOG manifold 4, in the liquid separation tank 3
Lower part gas distributor 19 is installed, the import of the top exit pipeline connection BOG compressors 1 of liquid separation tank 3, BOG compressors 1
Outlet remove after-condenser BOG pipelines 2；The connection BOG compressors of gas distributor 19 of lower part go out in the liquid separation tank 3
Mouth by-pass line 17, the other end of BOG compressor outlets by-pass line 17 are connected to after-condenser BOG pipelines 2 are removed；BOG compresses
Regulating valve 2 18 is installed on machine outlet by-pass line 17.
The import of the liquid collection tank 12 be respectively communicated with nitrogen or pressure natural gas line 11 and heating power safety valve and
Blow-down pipe 14；Triple valve 2 13 is installed on the heating power safety valve and blow-down pipe 14, triple valve 2 13 goes out all the way
Mouth is connected to the import of liquid collection tank 12 by pipeline, and another way outlet of triple valve 2 13 passes through pipeline and is connected to BOG manifold 4；
Lower part in the liquid collection tank 12 is equipped with electric-heating belt 16；Top in liquid collection tank 12 is gas-phase space, under
Portion is liquid Space；Gas-phase space is connected to the gaseous phase outlet of nitrogen or pressure natural gas line 11, liquid collection tank 12 respectively,
Liquid Space is connected to the liquid-phase outlet of liquid collection tank 12, and gaseous phase outlet is mounted on the top of liquid collection tank 12 and is connected to gas
Phase pipeline；Liquid-phase outlet is mounted on the bottom of liquid collection tank 12 and is connected to liquid phase pipeline；The vapor delivery line and liquid-phase tube
After line is connected to triple valve 1 respectively, pass through the inlet communication of pipeline and LNG storage tank 9.
The process step：
When liquid collection tank 12 need not empty, and be not required to the operation of electric-heating belt 16；
It is -150 from 9 temperature of LNG storage tankoThe BOG of C enters BOG manifold 4, is pressurized to by BOG compressors 1
0.7MPaG, outlet temperature -2oAfter-condenser BOG pipelines 2 are removed in C, later access；When heating power safety valve jumping up, heating power safety valve and
14 outlet temperature -150 of blow-down pipeoC, flow 200kg/h (duration 30min, gas phase score 0.012) pass through three later
Port valve 2 13 accesses liquid collection tank 12, and after carrying out liquid collection, gas phase is empty using triple valve 1 and the gas phase of LNG storage tank 9
Between be connected to.
Heating power safety valve and blow-down pipe 14 and BOG manifold 4 are completely isolated in whole process, ensure band liquid pipe line to BOG
The operation of compressor 1 does not have an impact.
Embodiment 2：
It is configured to the device of LNG receiving stations BOG systems：
The device for being used for LNG receiving stations BOG systems includes that LNG storage tank 9, BOG compressors 1, liquid separation tank 3 and liquid are collected
The top of tank 12, the LNG storage tank 9 is connected to the upstream of BOG pipelines 8, the downstreams of BOG pipelines 8 be respectively communicated with BOG manifold 4,
Return gas pipeline 5 and flare line 6；Torch liquid separation tank 7,7 downstream direction of torch liquid separation tank are installed on the flare line 6
Flare line 6 on regulating valve 1 is installed.The outlet liquid separation tank 3 of the BOG manifold 4, in the liquid separation tank 3
Lower part gas distributor 19 is installed, the import of the top exit pipeline connection BOG compressors 1 of liquid separation tank 3, BOG compressors 1
Outlet remove after-condenser BOG pipelines 2；The connection BOG compressors of gas distributor 19 of lower part go out in the liquid separation tank 3
Mouth by-pass line 17, the other end of BOG compressor outlets by-pass line 17 are connected to after-condenser BOG pipelines 2 are removed；BOG compresses
Regulating valve 2 18 is installed on machine outlet by-pass line 17.
The import of the liquid collection tank 12 be respectively communicated with nitrogen or pressure natural gas line 11 and heating power safety valve and
Blow-down pipe 14；Triple valve 2 13 is installed on the heating power safety valve and blow-down pipe 14, triple valve 2 13 goes out all the way
Mouth is connected to the import of liquid collection tank 12 by pipeline, and another way outlet of triple valve 2 13 passes through pipeline and is connected to BOG manifold 4；
Lower part in the liquid collection tank 12 is equipped with electric-heating belt 16；Top in liquid collection tank 12 is gas-phase space, under
Portion is liquid Space；Gas-phase space is connected to the gaseous phase outlet of nitrogen or pressure natural gas line 11, liquid collection tank 12 respectively,
Liquid Space is connected to the liquid-phase outlet of liquid collection tank 12, and gaseous phase outlet is mounted on the top of liquid collection tank 12 and is connected to gas
Phase pipeline；Liquid-phase outlet is mounted on the bottom of liquid collection tank 12 and is connected to liquid phase pipeline；The vapor delivery line and liquid-phase tube
After line is connected to triple valve 1 respectively, pass through the inlet communication of pipeline and LNG storage tank 9.
The process step：
When liquid collection tank 12 can empty, there is hydrops in the liquid separation tank 3 of 1 entrance of BOG compressors, be not required to electric-heating belt 16
When operation；
It is -140 from 9 temperature of LNG storage tankoThe BOG of C enters BOG manifold 4, is pressurized to by BOG compressors 1
0.7MPaG, outlet temperature 4oAfter-condenser BOG pipelines 2 are removed in C, later access.When 12 liquid level of liquid collection tank reaches 50%, heat
Power safety valve and blow-down pipe 14 are connected to triple valve 2 13 and access BOG manifold 4.Utilize nitrogen or pressure natural gas line 11
It is passed through gas (pressure 0.8MPaG), after pressurization, liquid is discharged into LNG storage tank 9 by triple valve 1 in liquid collection tank 12；
It completes after emptying, triple valve 2 13 is changed to connection liquid collection tank 12, and triple valve 1 is changed to gas phase connection LNG storage tank 9.BOG
There is hydrops in the liquid separation tank 3 of 1 entrance of compressor, the BOG gases from BOG compressor outlets by-pass line 17, temperature
0oC, pressure 0.7Mpag, after being depressurized by regulating valve 2 18, into the gas distributor 19 inside liquid separation tank 3, liquid separation of gasifying
The mixed gas temperature of hydrops in tank, generation is -150oC。
Only when 12 liquid level of liquid collection tank reaches a certain level, for withdrawal liquid, this operation is executed, due to nitrogen
Or pressure gas pressure is higher, and it is very short the time required to emptying, it completes after emptying, restores original setting of three-way valve, still
It maintains heating power safety valve and blow-down pipe 14 and BOG manifold 4 completely isolated, ensures heating power safety valve and blow-down pipe 14 to BOG
The operation of compressor 1 does not have an impact；There is hydrops in the liquid separation tank 3 of 1 entrance of BOG compressors, is bypassed using BOG compressor outlets
BOG after the drainage pressurization of pipeline 17 enters liquid separation tank 3, exchanges heat with hydrops after disperseing via gas distributor 19, reaches gasification, disappears
Except the purpose of hydrops.Whole process need not stop transport BOG compressors 1, and the continuous operation that can greatly improve entire process system is steady
It is qualitative.
Embodiment 3：
It is configured to the device of LNG receiving stations BOG systems：
The device for being used for LNG receiving stations BOG systems includes that LNG storage tank 9, BOG compressors 1, liquid separation tank 3 and liquid are collected
The top of tank 12, the LNG storage tank 9 is connected to the upstream of BOG pipelines 8, the downstreams of BOG pipelines 8 be respectively communicated with BOG manifold 4,
Return gas pipeline 5 and flare line 6；Torch liquid separation tank 7,7 downstream direction of torch liquid separation tank are installed on the flare line 6
Flare line 6 on regulating valve 1 is installed.The outlet liquid separation tank 3 of the BOG manifold 4, in the liquid separation tank 3
Lower part gas distributor 19 is installed, the import of the top exit pipeline connection BOG compressors 1 of liquid separation tank 3, BOG compressors 1
Outlet remove after-condenser BOG pipelines 2；The connection BOG compressors of gas distributor 19 of lower part go out in the liquid separation tank 3
Mouth by-pass line 17, the other end of BOG compressor outlets by-pass line 17 are connected to after-condenser BOG pipelines 2 are removed；BOG compresses
Regulating valve 2 18 is installed on machine outlet by-pass line 17.
The import of the liquid collection tank 12 be respectively communicated with nitrogen or pressure natural gas line 11 and heating power safety valve and
Blow-down pipe 14；Triple valve 2 13 is installed on the heating power safety valve and blow-down pipe 14, triple valve 2 13 goes out all the way
Mouth is connected to the import of liquid collection tank 12 by pipeline, and another way outlet of triple valve 2 13 passes through pipeline and is connected to BOG manifold 4；
Lower part in the liquid collection tank 12 is equipped with electric-heating belt 16；Top in liquid collection tank 12 is gas-phase space, under
Portion is liquid Space；Gas-phase space is connected to the gaseous phase outlet of nitrogen or pressure natural gas line 11, liquid collection tank 12 respectively,
Liquid Space is connected to the liquid-phase outlet of liquid collection tank 12, and gaseous phase outlet is mounted on the top of liquid collection tank 12 and is connected to gas
Phase pipeline；Liquid-phase outlet is mounted on the bottom of liquid collection tank 12 and is connected to liquid phase pipeline；The vapor delivery line and liquid-phase tube
After line is connected to triple valve 1 respectively, pass through the inlet communication of pipeline and LNG storage tank 9.
The process step：
When liquid collection tank 12 need not empty, and electric-heating belt 16 is run；
It is -145 from 9 temperature of LNG storage tankoThe BOG of C enters BOG manifold 4, is pressurized to by BOG compressors 1
0.7MPaG, outlet temperature 8oAfter-condenser BOG pipelines 2 are removed in C, later access；When heating power safety valve jumping up, heating power safety valve and
14 outlet temperature -145 of blow-down pipeoC, flow 400kg/h (duration 30min, gas phase score 0.015) pass through three later
Port valve 2 13 accesses liquid collection tank 12, and liquid gasifies after the heating of electric-heating belt 16, and temperature is -140oC, gas phase utilize three
Port valve 1 is connected to the gas-phase space of LNG storage tank 9.
Heating power safety valve and blow-down pipe 14 and BOG manifold 4 are completely isolated in whole process, ensure band liquid pipe line to BOG
The operation of compressor 1 does not have an impact.Meanwhile liquid is collected using 16 heating and gasifying of electric-heating belt, reach the mesh of recycling
's.
The technical personnel in the technical field can readily realize the present invention with the above specific embodiments,.But it answers
Work as understanding, the present invention is not limited to above-mentioned several specific implementation modes.On the basis of the disclosed embodiments, the technology
The technical staff in field can arbitrarily combine different technical features, to realize different technical solutions.
Claims (8)
1. a kind of device for LNG receiving stations BOG systems, which is characterized in that the device include LNG storage tank, BOG compressors,
The top of liquid separation tank and liquid collection tank, the LNG storage tank is connected to the upstream of BOG pipelines, and the downstream of BOG pipelines connects respectively
Logical BOG manifold returns gas pipeline and flare line；The outlet liquid separation tank of the BOG manifold, the top exit of liquid separation tank
Pipeline is connected to the import of BOG compressors, and the outlet of BOG compressors removes after-condenser BOG pipelines；
The import of the liquid collection tank is respectively communicated with nitrogen or pressure natural gas line and heating power safety valve and blow-down pipe,
Triple valve two is installed, a way outlet of triple valve two is connected to liquid by pipeline on the heating power safety valve and blow-down pipe
Another way outlet of the import of collecting tank, triple valve two is connected to BOG manifold by pipeline；The outlet line of liquid collection tank is connected to
LNG storage tank.
2. a kind of device for LNG receiving stations BOG systems according to claim 1, which is characterized in that the liquid
Top in collecting tank is gas-phase space, and lower part is liquid Space；Gas-phase space respectively with nitrogen or pressure natural gas line, liquid
The gaseous phase outlet of body collecting tank is connected to, and liquid Space is connected to the liquid-phase outlet of liquid collection tank, and gaseous phase outlet is mounted on liquid
The top of collecting tank is simultaneously connected to vapor delivery line；Liquid-phase outlet is mounted on the bottom of liquid collection tank and is connected to liquid phase pipeline；It is described
Vapor delivery line and after liquid phase pipeline is connected to triple valve one respectively, pass through the inlet communication of pipeline and LNG storage tank.
3. a kind of device for LNG receiving stations BOG systems according to claim 1, which is characterized in that the liquid
Lower part in collecting tank is equipped with electric-heating belt.
4. a kind of device for LNG receiving stations BOG systems according to claim 1, which is characterized in that the liquid separation
Lower part in tank is equipped with gas distributor.
5. a kind of device for LNG receiving stations BOG systems according to claim 1 or 4, which is characterized in that described
In liquid separation tank lower part gas distributor be connected to BOG compressor outlet by-pass lines, BOG compressor outlet by-pass lines it is another
It holds and is connected to after-condenser BOG pipelines are removed.
6. a kind of device for LNG receiving stations BOG systems according to claim 5, which is characterized in that the BOG
Regulating valve two is installed on compressor outlet by-pass line.
7. a kind of device for LNG receiving stations BOG systems according to claim 1, which is characterized in that the torch
Torch liquid separation tank is installed on pipeline, regulating valve one is installed on the flare line of torch liquid separation tank downstream direction.
8. a kind of process for LNG receiving stations BOG systems, which is characterized in that steps are as follows for the process：
1）It is -150 that LNG storage tank temperature, which will be come from,o C~-140o The BOG of C respectively enter BOG manifold, gas return tube line and
Flare line；
2）Heating power safety valve and blow-down pipe are isolated by triple valve two with BOG manifold；
3）The downstream of heating power safety valve and blow-down pipe is connected to liquid collection tank, monitors the band of heating power safety valve and blow-down pipe
Liquid situation passes through pipeline and LNG storage tank after being connected to the vapor delivery line of liquid collection tank and liquid phase pipeline with triple valve one respectively
Inlet communication；It needs the gas phase for closing triple valve one when drain to be connected to, opens liquid phase connection, open nitrogen or pressure natural gas
Pipeline realizes that drain enters LNG storage tank；
4）When liquid collection tank drain, the triple valve two of heating power safety valve and blow-down pipe is temporarily connected to BOG manifold, and drain is complete
Cheng Hou restores triple valve two and is connected to liquid collection tank；
5）When liquid collection tank drain is not applicable, start electric-heating belt, the liquid in heating and gasifying liquid collection tank is sent into
LNG storage tank；
6）When liquid collection tank carries out drain, when there is hydrops in liquid separation tank, drained using BOG compressor outlet by-pass lines
BOG after pressurization enters liquid separation tank, exchanges heat with hydrops after the gas distributor dispersion inside it in liquid separation tank, reaches gas
Change, eliminate the purpose of hydrops.
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| CN201710071513.5A CN106838605B (en) | 2017-02-09 | 2017-02-09 | A kind of process and device for LNG receiving stations BOG systems |
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| CN201710071513.5A CN106838605B (en) | 2017-02-09 | 2017-02-09 | A kind of process and device for LNG receiving stations BOG systems |
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| CN109386736A (en) * | 2017-08-09 | 2019-02-26 | 中国石油化工股份有限公司 | The collection method of chemicals shipment process Volatile Gas |
| CN107606487B (en) * | 2017-09-14 | 2023-05-09 | 中国寰球工程有限公司 | BOG control method applicable to LNG storage tanks under different design pressures |
| CN109630890B (en) * | 2019-01-10 | 2020-04-07 | 舟山博睿船舶科技开发有限公司 | Small-sized LNG supply system and control method thereof |
| US11717784B1 (en) | 2020-11-10 | 2023-08-08 | Solid State Separation Holdings, LLC | Natural gas adsorptive separation system and method |
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| JP2014031829A (en) * | 2012-08-03 | 2014-02-20 | Chugoku Electric Power Co Inc:The | Residual lng recovery method |
| CN204026149U (en) * | 2014-06-16 | 2014-12-17 | 中海浙江宁波液化天然气有限公司 | There is the LNG Liquefied natural gas receiving station of the direct outer communication system of boil-off gas |
| CN106287219A (en) * | 2016-09-26 | 2017-01-04 | 湖北和远气体股份有限公司 | A kind of natural gas liquefaction plant BOG recycling system |
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2017
- 2017-02-09 CN CN201710071513.5A patent/CN106838605B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11577191B1 (en) | 2021-09-09 | 2023-02-14 | ColdStream Energy IP, LLC | Portable pressure swing adsorption method and system for fuel gas conditioning |
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