CN206858511U - BOG recovery liquefaction removing Nitrogen in Natural Gases gas process systems - Google Patents
BOG recovery liquefaction removing Nitrogen in Natural Gases gas process systems Download PDFInfo
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- CN206858511U CN206858511U CN201720712210.2U CN201720712210U CN206858511U CN 206858511 U CN206858511 U CN 206858511U CN 201720712210 U CN201720712210 U CN 201720712210U CN 206858511 U CN206858511 U CN 206858511U
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- bog
- denitrification column
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- gas
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Abstract
The utility model discloses a kind of BOG to reclaim liquefaction removing Nitrogen in Natural Gases gas process system, including BOG recuperators, BOG heaters, BOG compressors, ice chest, heavy hydrocarbon separator, denitrification column.Specifically：1st, natural gas by ice chest precooling zone, in enter heavy hydrocarbon separator after cold section, remove more than C4 heavy hydrocarbon component, the natural gas after removing is divided into two-way, directly enters denitrification column pre-cooling zone from bottom all the way；Another part comes back to the cryogenic of ice chest, and by throttling, into the middle cold-zone of denitrification column, and the natural gas entered to lower section is sprayed and mixed.2nd, the BOG gases in big tank are after BOG recuperators, BOG heaters, BOG compressors, ice chest, and into the cyrogenic region of denitrification column, by throttling, centering cold-zone and pre-cooling zone natural gas are sprayed.Natural gas after denitrogenation is flowed out from denitrogenation tower bottom, reenters LNG ice chests, and the gas rich in nitrogen is discharged from denitrification column top, realizes N in recovery BOG gas removal natural gases2Purpose.
Description
Technical field
It the utility model is related to and utilize BOG natural gas liquefaction denitrification process devices, specifically using the BOG in LNG storage tank
Gas, by re-heat, heat, compression, LNG ice chest deep coolings, into denitrification column, after throttling, by spray, remove Nitrogen in Natural Gases
The process unit of gas.
Background technology
Nitrogen in Natural Gases gas can increase energy consumption and flash distillation amount in liquefaction process, can not only reduce the liquefaction of natural gas
Rate, it can also increase BOG amounts；LNG is produced and is inevitably produced BOG during storing.If a large amount of BOG can not be rationally sharp
With, it can only be vented, cause production cost to increase, also can be to environmental effects.Industry is it is generally believed that natural gas nitrogen content is more than
Denitrogenation should be carried out when 3%.This patent is related to recovery BOG and liquefied again, and removes N simultaneously2, make N2Content is less than 0.1%, realizes
Energy-conservation, consumption reduction, have important economy, source benefit.
The content of the invention
The utility model is in order to solve the Denitrogenation of the recovery of BOG gases and natural gas in LNG storage tank, there is provided one kind storage
The process system that BOG gases in tank liquefy and removed to Nitrogen in Natural Gases gas again.
The utility model adopts the following technical scheme that realization：
A kind of BOG recovery liquefaction removing Nitrogen in Natural Gases gas process system, including LNG ice chests, the LNG ice chests it is natural
Gas import connection natural gas air inlet pipe road, the middle cold-zone outlet of LNG ice chests connect heavy hydrocarbon separator import by choke valve；It is described
The top exit of heavy hydrocarbon separator is divided into two-way, and a-road-through crosses the cyrogenic region Imported gas of choke valve connection LNG ice chests, LNG
The cyrogenic region gas outlet of ice chest connects the middle cold-zone upper spray pipe road of denitrification column by choke valve, and another way passes through cooling
The pre-cooling zone import of denitrification column is connected after device and choke valve.
The BOG imports of the LNG ice chests connect BOG compressor outlets by choke valve, and the BOG compressor inlets pass through
Choke valve connects BOG heater outlets, and the BOG heater inlets connect BOG recuperators by choke valve and exported；The LNG
The cyrogenic region BOG outlets of ice chest connect the cyrogenic region BOG imports of denitrification column, the cyrogenic region BOG outlets of denitrification column by choke valve
The middle cold-zone lower spray pipe road of denitrification column is connected by choke valve.
During work, 1, natural gas enter LNG ice chests precooling zone and in cold section, through supercooling, throttling, natural gas（Temperature-
55℃）Into heavy hydrocarbon separator, more than C4 heavy hydrocarbon is removed in heavy hydrocarbon separator, is discharged through separator bottom.Natural gas is from again
Hydrocarbon separator top is divided into two-way after coming out：All the way through cooling down, throttling（- 110 DEG C or so of temperature）Into denitrification column pre-cooling zone；Separately
All the way after throttling（- 50 DEG C or so of temperature）Enter the cyrogenic region of LNG ice chests, LNG after then throttling afterwards（Temperature is not less than -160
℃）The lower spray pipe road of cold-zone in denitrification column 6 is passed through, the natural gas come on pre-cooling zone is sprayed and mixed.
2nd, the BOG gases in storage tank, by BOG recuperators, BOG heaters, BOG compressors, BOG（35 DEG C or so of temperature,
The MPa of pressure 1.0）Into LNG ice chests, denitrification column cyrogenic region is entered behind pre-cooling zone, middle cold-zone, cyrogenic region, then through throttling
The upper spray pipe road of cold-zone in denitrification column is passed through afterwards.After BOG throttlings（Temperature is not less than -180 DEG C）, centering cold-zone and pre-cooling zone
The spray of the natural gas progress to come up, nitrogen is removed, it is cold that the outflow below denitrification column of the natural gas after purification reenters LNG
Case, rich nitrogen tail gas are discharged above denitrification column, realize the purpose of N2 in recovery BOG gas removal natural gases.
The utility model is designed reasonably, process unit carry out denitrogenation, solution to natural gas using the BOG gases in LNG storage tank
The recycling problem determined to BOG gases.The efficient utilization to the energy is realized, reduces operating cost.
Brief description of the drawings
Fig. 1 represents process system schematic diagram of the present utility model.
In figure：1-BOG recuperators, 2-BOG heaters, 3-BOG compressors, 4-LNG ice chests, 5- heavy hydrocarbon separators, 6- take off
Nitrogen tower, 7- choke valves.
Embodiment
Specific embodiment of the utility model is described in detail below in conjunction with the accompanying drawings.
A kind of BOG recovery liquefaction removing Nitrogen in Natural Gases gas process system, including BOG recuperators, BOG heaters, BOG pressure
Contracting machine, ice chest, heavy hydrocarbon separator, denitrification column.1st, natural gas by ice chest precooling zone, in enter heavy hydrocarbon separator after cold section,
More than C4 heavy hydrocarbon component is removed, the natural gas after removing is divided into two-way, directly enters denitrification column pre-cooling zone from bottom all the way；Separately
A part comes back to the cryogenic of ice chest, and by throttling, into the middle cold-zone of denitrification column, and the natural gas entered to lower section enters
Row spray and mixing.2nd, the BOG gases in big tank enter after BOG recuperators, BOG heaters, BOG compressors, ice chest
The cyrogenic region of denitrification column, by throttling, centering cold-zone and pre-cooling zone natural gas are sprayed.Natural gas after denitrogenation is from denitrification column
Bottom is flowed out, and reenters LNG ice chests, and the gas rich in nitrogen is discharged from denitrification column top.
Specific annexation is as shown in figure 1, the Imported gas connection natural gas air inlet pipe road of LNG ice chests 4, LNG ice chests 4
The outlet of middle cold-zone the import of heavy hydrocarbon separator 5 is connected by choke valve 7；The top exit of the heavy hydrocarbon separator 5 is divided into two-way,
A-road-through crosses the cyrogenic region Imported gas that choke valve 7 connects LNG ice chests 4, and the cyrogenic region gas outlet of LNG ice chests 4 passes through
Choke valve 7 connects the middle cold-zone upper spray pipe road of denitrification column 6, and another way passes through cooler（It is not drawn into figure）With choke valve 7
The pre-cooling zone import of denitrification column 6 is connected afterwards.Natural gas enters the pre-cooling zone of LNG ice chests 4 and middle cold-zone after throttling, through supercooling
But, throttle, natural gas（- 55 DEG C of temperature）Into heavy hydrocarbon separator 5, more than C4 heavy hydrocarbon is removed in heavy hydrocarbon separator 5, through separation
Discharge device bottom.Natural gas is divided into two-way after being come out from heavy hydrocarbon separator top：All the way through cooling down, throttling（- 110 DEG C of left sides of temperature
It is right）Into the pre-cooling zone of denitrification column 6；Another way is after throttling（- 50 DEG C or so of temperature）Afterwards into the cyrogenic region of LNG ice chests, throttling
LNG afterwards（Temperature is not less than -160 DEG C）Into cold-zone in denitrification column 6, and the natural gas entered to lower section is sprayed and mixed.
Exported as shown in figure 1, the BOG imports of LNG ice chests 4 connect BOG compressors 3 by choke valve 7, the BOG compressions
The import of machine 3 connects BOG heater outlets by choke valve 7, and the BOG heater inlets connect BOG recuperators by choke valve 7
Outlet；The cyrogenic region BOG outlets of the LNG ice chests 4 connect the cyrogenic region BOG imports of denitrification column 6, denitrification column 6 by choke valve 7
Cyrogenic region BOG outlet by choke valve 7 connect denitrification column 6 middle cold-zone lower spray pipe road.BOG gases in storage tank, warp
Cross BOG recuperators 1, BOG heaters 2, BOG compressors 3, BOG（35 DEG C or so of temperature, the MPa of pressure 1.0）Into LNG ice chests 4,
Throttled after entering the cyrogenic region of denitrification column 6 behind pre-cooling zone, middle cold-zone, cyrogenic region.After BOG throttlings（Temperature not less than-
180℃）, spray, the removing nitrogen of the natural gas progress of centering cold-zone and pre-cooling zone, the natural gas after purification is under denitrification column 6
Side's outflow reenters LNG ice chests, and rich nitrogen tail gas is discharged above denitrification column, realizes N in recovery BOG gas removal natural gases2
Purpose.
It should be noted last that above example is only unrestricted to illustrate the technical solution of the utility model, to the greatest extent
Pipe is described in detail with reference to the utility model embodiment, it will be understood by those within the art that, it is new to this practicality
The technical scheme of type is modified or equivalent substitution, without departure from the spirit and scope of the technical solution of the utility model, its
It all should cover in claims.
Claims (1)
- A kind of 1. BOG recovery liquefaction removing Nitrogen in Natural Gases gas process system, it is characterised in that：Including LNG ice chests（4）, it is described LNG ice chests（4）Imported gas connection natural gas air inlet pipe road, LNG ice chests（4）Middle cold-zone outlet pass through choke valve（7） Connect heavy hydrocarbon separator（5）Import；The heavy hydrocarbon separator（5）Top exit be divided into two-way, a-road-through crosses choke valve（7）Even Connect LNG ice chests（4）Cyrogenic region Imported gas, LNG ice chests（4）Cyrogenic region gas outlet pass through choke valve（7）Connection Denitrification column（6）Middle cold-zone upper spray pipe road, another way passes through cooler and choke valve（7）After connect denitrification column（6）It is pre- Cold-zone import；The LNG ice chests（4）BOG imports pass through choke valve（7）Connect BOG compressors（3）Outlet, the BOG compressors（3） Import passes through choke valve（7）BOG heater outlets are connected, the BOG heater inlets pass through choke valve（7）Connect BOG re-heats Device exports；The LNG ice chests（4）Cyrogenic region BOG outlet pass through choke valve（7）Connect denitrification column（6）Cyrogenic region BOG enter Mouthful, denitrification column（6）Cyrogenic region BOG outlet pass through choke valve（7）Connect denitrification column（6）Middle cold-zone lower spray pipe road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720712210.2U CN206858511U (en) | 2017-06-19 | 2017-06-19 | BOG recovery liquefaction removing Nitrogen in Natural Gases gas process systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720712210.2U CN206858511U (en) | 2017-06-19 | 2017-06-19 | BOG recovery liquefaction removing Nitrogen in Natural Gases gas process systems |
Publications (1)
| Publication Number | Publication Date |
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| CN206858511U true CN206858511U (en) | 2018-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720712210.2U Active CN206858511U (en) | 2017-06-19 | 2017-06-19 | BOG recovery liquefaction removing Nitrogen in Natural Gases gas process systems |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110540882A (en) * | 2019-08-28 | 2019-12-06 | 四川杰瑞恒日天然气工程有限公司 | Denitrification method for natural gas liquefaction device |
| CN114593559A (en) * | 2020-12-04 | 2022-06-07 | 惠生（南通）重工有限公司 | BOG (boil off gas) rectification and denitrification device applied to FLNG (flash gas recovery turbine) |
-
2017
- 2017-06-19 CN CN201720712210.2U patent/CN206858511U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110540882A (en) * | 2019-08-28 | 2019-12-06 | 四川杰瑞恒日天然气工程有限公司 | Denitrification method for natural gas liquefaction device |
| CN114593559A (en) * | 2020-12-04 | 2022-06-07 | 惠生（南通）重工有限公司 | BOG (boil off gas) rectification and denitrification device applied to FLNG (flash gas recovery turbine) |
| CN114593559B (en) * | 2020-12-04 | 2024-03-26 | 惠生清洁能源科技集团股份有限公司 | BOG rectification denitrification device applied to FLNG |
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