CN109916136A - The system that BOG unstripped gas low temperature purifies and produces LNG - Google Patents
The system that BOG unstripped gas low temperature purifies and produces LNG Download PDFInfo
- Publication number
- CN109916136A CN109916136A CN201711324114.1A CN201711324114A CN109916136A CN 109916136 A CN109916136 A CN 109916136A CN 201711324114 A CN201711324114 A CN 201711324114A CN 109916136 A CN109916136 A CN 109916136A
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- China
- Prior art keywords
- rectifying column
- heat exchanger
- gas
- bog
- lng
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Links
- 239000007789 gas Substances 0.000 claims abstract description 52
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 17
- 238000003860 storage Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 7
- 239000008246 gaseous mixture Substances 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- WWYNJERNGUHSAO-XUDSTZEESA-N (+)-Norgestrel Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](CC)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 WWYNJERNGUHSAO-XUDSTZEESA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention relates to gas liquefaction fields, it provides and a kind of produces LNG, the BOG gas generated in storage and transportational process, the system for producing LNG by the method for cryogenic rectification, including air inlet pipe and LNG storage tank, it further include cooling assembly and first rectifying column, cooling assembly includes First Heat Exchanger, air inlet pipe is connected to first rectifying column feed inlet, BOG unstripped gas is exchanged heat by air inlet pipe in First Heat Exchanger, the liquid outlet of first rectifying column is connected to LNG storage tank by escape pipe, first rectifying column distillates gas by escape pipe in exchanging heat in First Heat Exchanger, the tower bottom distillate of first rectifying column leads to LNG storage tank.Unstripped gas enters heat exchange cooling in First Heat Exchanger by air inlet pipe in the present invention, and in first rectifying column by unstripped gas nitrogen and methane be fractionated, first rectifying column tower top exports the gaseous mixture based on nitrogen, first rectifying column tower bottom distillate is collected to LNG storage tank, whole process isolates the nitrogen in BOG unstripped gas and produces LNG, whole process is produced high-efficient, and econmics comparison is good.
Description
Technical field
The present invention relates to gas purifications and gas liquefaction field, are a kind of systems that BOG unstripped gas purifies and produces LNG.
Background technique
LNG is in production, storage and transportational process, along with the generation of BOG (Boil off gas, flash steam), BOG master
It will be by the methane (CH of 80-98%4) and 2-20% nitrogen (N2) composition.Due to the lasting accumulation of BOG, LNG storage tank will lead to
Pressure rise jeopardizes safety.Current technical level and under the conditions of, Normal practice is to empty BOG unstripped gas to atmosphere
Processing, this results in waste of resources and environmental pollution.Purifying and producing LNG is the potential tupe of tool, existing low temperature cold
Jelly directly produces LNG mode, and not high to the rate of recovery of methane in BOG, having larger amount of methane always can not carry out with nitrogen
It efficiently separates, and at high cost, it is less economical.
Summary of the invention
The purpose of the present invention is to provide a kind of systems that BOG unstripped gas purifies and produces LNG, it is intended to existing for solving
BOG unstripped gas produce the low problem of LNG higher cost, the rate of recovery.
Technical solution of the present invention:
The embodiment of the present invention provides a kind of system that BOG unstripped gas purifies and produces LNG, including air inlet pipe and LNG storage
Tank, it is characterised in that: further include the cooling assembly that can freeze and can component separation first rectifying column, the cooling assembly packet
First Heat Exchanger is included, the air inlet pipe is connected to the first rectifying column feed inlet, and unstripped gas is by the air inlet pipe in first
Heat exchanger heat exchange, the gas outlet of the first rectifying column are connected to LNG storage tank by escape pipe, the distillate gas of first rectifying column
For body by escape pipe in exchanging heat in First Heat Exchanger, the tower bottom distillate of the first rectifying column leads to LNG storage tank.
It further, further include nitrogen cooling capacity collection channel, first rectifying column tower top distillate gas low temperature nitrogen gas passes through
The nitrogen cooling capacity collection channel in First Heat Exchanger in exchanging heat.
It further, further include the second heat exchanger that can freeze, the tower top distillate gas of first rectifying column is in the second heat exchanger
Inner part condenses and is back to first rectifying column as overhead reflux liquid, and the unstripped gas through the second heat exchanger enters First Heat Exchanger
Interior heat exchange.
Further, heating unit, heating unit are in series on rear side of the condenser of cooling assembly along refrigerant flow direction
By extracting the refrigerant of cooling assembly to first rectifying column heat supply or by heat-carrying circulating heat transfer to first rectifying column.
The invention has the following advantages:
In preparation system of the invention, BOG unstripped gas is entered by air inlet pipe carries out heat exchange cooling in First Heat Exchanger, makes
It obtains BOG unstripped gas and is condensed into gas-liquid two-phase fluid, and be transported to first rectifying column, first rectifying column passes through cryogenic rectification original
Reason and technology, by unstripped gas nitrogen and methane be fractionated, the tower bottom of tower reactor exports LNG, and by escape pipe collect to
LNG storage tank, while the gas that distillates of first rectifying column is entered in First Heat Exchanger by escape pipe, i.e., is returned by First Heat Exchanger
Discharge system after receipts cold energy.The nitrogen in unstripped gas can be not only isolated by above-mentioned working method, and can be produced
LNG, whole process are produced high-efficient, and econmics comparison is good.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to explain introduction:
Fig. 1 is that a kind of BOG unstripped gas provided in an embodiment of the present invention purifies and produces the system structure diagram of LNG；
Fig. 2 is that BOG unstripped gas of embodiment of the present invention on the basis of Fig. 1 with the second heat exchanger purifies and produce LNG's
System structure diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
Such as Fig. 1, the embodiment of the present invention provide a kind of system that BOG unstripped gas purifies and produces LNG, including air inlet pipe 1 with
And LNG storage tank 3, wherein air inlet pipe 1 is for importing BOG unstripped gas, and BOG unstripped gas is mainly nitrogen and methane, LNG storage tank
3 are for storing the LNG isolated in BOG unstripped gas, and preparation system further includes cooling assembly 11 and first rectifying column
6, first rectifying column 6 is to achieve the purpose that gas-liquid separation by low temperature distillation technology, and wherein cooling assembly 11 is mainly by compressor
9, condenser 8, First Heat Exchanger 4, throttling element 5 or expanding machine, pipeline form circulation loop, and refrigerant is in compressor 9
It is compressed into high temperature and high pressure gas, is cooled to room temperature through condenser 8, then is input to First Heat Exchanger 4 and is cooled to low temperature, then lead to
It crosses throttling element 5 or expansion work becomes low-temp low-pressure medium, discharge cold energy in First Heat Exchanger 4, it is cooling in the form of backheat
The refrigerant of high pressure, air inlet pipe 1 are connected to first rectifying column 6, then BOG unstripped gas is changed by air inlet pipe 1 in First Heat Exchanger 4
The tower bottom gas outlet of heat, first rectifying column 6 is connected to LNG storage tank 3 by tower bottom escape pipe 13, and the tower top of first rectifying column 6
It distillates gas to enter in First Heat Exchanger 4 by tower top escape pipe 12, the heating in the tower reactor 7 of first rectifying column is by heating unit
10 provide.In the present invention, after BOG unstripped gas imports air inlet pipe 1, and after the heat exchange refrigeration of First Heat Exchanger 4, BOG raw material temperature
Degree reduces, and wherein methane mutually becomes liquid, i.e., is gas-liquid two-phase fluid in importing first rectifying column 6, first rectifying column 6 passes through
Cryogenic rectification principle and technology, by unstripped gas nitrogen and methane be fractionated, the tower top escape pipe 12 of first rectifying column 6 is defeated
Nitrogen out, tower bottom escape pipe 13 export liquid methane and by methane collections to LNG storage tank 3.It in above process, not only can be with
The nitrogen in BOG unstripped gas is isolated, and LNG can be produced, whole process is produced high-efficient, and econmics comparison is good.It is logical
Often, the tower top escape pipe 12 of first rectifying column 6 exports nitrogen, and recyclable low temperature nitrogen carries when by First Heat Exchanger 4
Cold energy.In addition, can be using cooling assembly 11 come heat supply, specifically, along refrigerant for the cryogenic rectification technology of first rectifying column 6
Path direction can be by extracting the refrigerant of cooling assembly 11 to the first rectifying in the rear side of the condenser 8 of cooling assembly 11
6 heat supply of tower transfers heat to first rectifying column 6 in such a way that heat-carrying recycles, and heat-carrying is mainly driven by pump for heat-carrying circulation
Medium discharges heat in the tower reactor 7 of first rectifying column 6.In addition, preparation system further includes having second in other embodiment
Heat exchanger 14, the second heat exchanger 14 are also to condense for gas, and first rectifying column 6 distillates gas by escape pipe 12 in the
In two heat exchangers 14, the nitrogen that first rectifying column 6 is isolated is changed into first afterwards after first passing through 14 partial condensation of the second heat exchanger
Exchange heat released cold quantity in hot device 4.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of system that BOG unstripped gas purifies and produces LNG, including air inlet pipe, heat exchanger, throttle valve and LNG storage tank,
Be characterized in that: further include the cooling assembly that can freeze and can component separation first rectifying column, the cooling assembly includes the
One heat exchanger, the air inlet pipe are connected with a feeder connection in the First Heat Exchanger, channel outlet and first essence
It evaporates tower feed inlet to be connected, unstripped gas is exchanged heat in First Heat Exchanger by air inlet pipe, the bottom gas outlet of first rectifying column and LNG
Storage tank is connected to by escape pipe, and first rectifying column overhead gas is exchanged heat in First Heat Exchanger by escape pipe, the first essence
The tower bottom distillate distillate for evaporating tower is passed through LNG storage tank and is stored.
2. the system that BOG unstripped gas according to claim 1 purifies and produces LNG, it is characterised in that: further include that nitrogen is cold
Collection channel is measured, first rectifying column overhead gas, that is, low temperature nitrogen gas is by the nitrogen cooling capacity collection channel in first
Heat exchange in heat exchanger.
3. the system that BOG unstripped gas according to claim 1 purifies and produces LNG, it is characterised in that: further include that can freeze
The second heat exchanger, the tower top distillate gas of first rectifying column condenses in the second heat exchanger inner part and as overhead reflux liquid
It is back to first rectifying column, the non-condensation gas through second heat exchanger, which enters in First Heat Exchanger, to exchange heat.
4. the system that BOG unstripped gas according to claim 1 purifies and produces LNG, it is characterised in that: first rectifying column bottom
Heating unit heats mode in portion's tower reactor can be heated by electric heater, can also be higher cold by temperature in cooling assembly
Matchmaker is directly introduced into tower reactor and heats, and can also be recycled the higher heat transfer of temperature in cooling assembly to the by heat-carrying
In one rectifier bottoms tower reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711324114.1A CN109916136A (en) | 2017-12-13 | 2017-12-13 | The system that BOG unstripped gas low temperature purifies and produces LNG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711324114.1A CN109916136A (en) | 2017-12-13 | 2017-12-13 | The system that BOG unstripped gas low temperature purifies and produces LNG |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109916136A true CN109916136A (en) | 2019-06-21 |
Family
ID=66958270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711324114.1A Pending CN109916136A (en) | 2017-12-13 | 2017-12-13 | The system that BOG unstripped gas low temperature purifies and produces LNG |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109916136A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111249852A (en) * | 2020-02-13 | 2020-06-09 | 中国科学院理化技术研究所 | Regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261428A (en) * | 1997-07-01 | 2000-07-26 | 埃克森生产研究公司 | Process for liquefying a natural gas stream containing at least one freezable component |
| CN102021056A (en) * | 2010-11-26 | 2011-04-20 | 成都赛普瑞兴科技有限公司 | Method for preparing natural gas/liquefied natural gas by denitrifying nitrogen-containing methane gas |
| CN103031169A (en) * | 2012-12-13 | 2013-04-10 | 新地能源工程技术有限公司 | Method and device for carrying out liquefaction and heavy hydrocarbon treatment on natural gas |
| CN106883897A (en) * | 2017-03-29 | 2017-06-23 | 四川华亿石油天然气工程有限公司 | BOG separating-purifyings equipment and technique |
-
2017
- 2017-12-13 CN CN201711324114.1A patent/CN109916136A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261428A (en) * | 1997-07-01 | 2000-07-26 | 埃克森生产研究公司 | Process for liquefying a natural gas stream containing at least one freezable component |
| CN102021056A (en) * | 2010-11-26 | 2011-04-20 | 成都赛普瑞兴科技有限公司 | Method for preparing natural gas/liquefied natural gas by denitrifying nitrogen-containing methane gas |
| CN103031169A (en) * | 2012-12-13 | 2013-04-10 | 新地能源工程技术有限公司 | Method and device for carrying out liquefaction and heavy hydrocarbon treatment on natural gas |
| CN106883897A (en) * | 2017-03-29 | 2017-06-23 | 四川华亿石油天然气工程有限公司 | BOG separating-purifyings equipment and technique |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111249852A (en) * | 2020-02-13 | 2020-06-09 | 中国科学院理化技术研究所 | Regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration |
| CN111249852B (en) * | 2020-02-13 | 2022-04-26 | 中国科学院理化技术研究所 | A regenerative oil and gas VOCs condensation recovery system with mixed refrigerant refrigeration |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190621 |
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| RJ01 | Rejection of invention patent application after publication |