CN106861222A - Boil-off gas after-condenser - Google Patents
Boil-off gas after-condenser Download PDFInfo
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- CN106861222A CN106861222A CN201510917334.XA CN201510917334A CN106861222A CN 106861222 A CN106861222 A CN 106861222A CN 201510917334 A CN201510917334 A CN 201510917334A CN 106861222 A CN106861222 A CN 106861222A
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- bog
- microporous pipe
- lng
- condensers
- guide shell
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Abstract
A kind of BOG after-condensers, including：Guide shell (4), LNG entrances (3) and outlet are provided with guide shell, microporous pipe (5) is provided with guide shell, close microporous pipe (5) one end, the other end is communicated to BOG entrances (1), and the surface of microporous pipe (5) is provided with micropore；And mixed cell (7), for being mixed, one end of mixed cell (7) and the outlet of guide shell (4), the other end are provided with LNG outlets (8).BOG after-condensers organic efficiency of the invention is high, compact conformation, equipment operation are easy, easy to maintenance.
Description
Technical field
The present invention relates to liquefied natural gas (LNG) boil-off gas (BOG) recycling, more particularly to it is used for
The BOG after-condensers of LNG storages, unloading and transfer.
Background technology
Processing mode to LNG storage tank BOG can be divided into direct output method and again two kinds of condensation method.It is directly defeated
It is after BOG is compressed into outer defeated pressure, to be fed directly to gas line network to go out method；Condensation method is to press BOG again
Relatively low pressure is reduced to, is mixed within the condenser with the LNG sent out from LNG storage tank by LNG low-pressure deliveries pump
Close.Due to being in supercooled state after LNG pressurizations, BOG can be made to condense again, condensed LNG warps
It is after the pressurization of LNG high-pressure delivery pumps then outer defeated through vaporization.Condensation method can utilize the cold of LNG again, and subtract
Lack the consumption of BOG work done during compressions, save energy.
Generally, condensation process uses after-condenser to BOG again, after-condenser there is relatively large volume so that
Combination BOG condensates must be allowed with LNG exhalations so as to form subcooled liquid, if buffer volumes are not enough,
Steam may be introduced into high-pressure pump, and this is likely to result in the cavitation/air pocket in pump, cause parts damages, reduce effect
Rate and final shortening pump life-span.So cause that after-condenser equipment volume is excessive, increases project investment.
The after-condenser of current LNG receiving stations uses filler tower design, internals mainly have vortex broken device,
Raschig ring filler layer or structured filling material layer, liquid distribution trough, gas distributing disc, liquid deflection plate, gas folding
Stream plate, packing support plate, flash distillation disk.Wherein liquid distribution trough, gas distributing disc packing layer primarily to
Increase the contact area of BOG and LNG, improve condensation effect.But it is in actual moving process then cold
Condenser be highly susceptible to low pressure delivery trunk, house steward BOG, downstream pipe network fluctuation interference, any one because
The fluctuation of element can all produce interference to after-condenser, and control difficulty is big.
BOG after-condensers are the cores of LNG receiving stations operation control, are related to the steady fortune of whole receiving station
OK.At present tradition after-condenser problem is encountered that：(1) BOG and supercooling in the limited device space
LNG times of contact, not enough condensation effect was bad again for BOG；(2) operating mode of the existing after-condenser in fluctuation
Lower treatment effect is general, so as to have influence on the operation of the equipment such as downstream LNG pump；(3) tradition BOG is cold again
Condenser equipment volume is big, and investment is high.
The content of the invention
It is an object of the invention to provide a kind of BOG after-condensers, it can overcome BOG in existing after-condenser
, again condensation effect bad defect insufficient contact with supercooling LNG.
The present invention uses solution below：
A kind of boil-off gas (BOG) after-condenser, including：
Guide shell, is provided with LNG entrance and exits on the guide shell, micropore is provided with the guide shell
Pipe, microporous pipe one end closing, the other end is communicated to BOG entrances, and the surface of the microporous pipe is provided with
Micropore；And
Mixed cell, for being mixed, the outlet of one end of the mixed cell and the guide shell,
The other end is provided with LNG outlets.
Preferably, described one end of the microporous pipe is fixed in removable supportive grid, and the other end is fixed
In on tube sheet.
Preferably, the aperture of the micropore of the micropore pipe surface is 5~100 microns.
Preferably, the microporous pipe is by sinter molding or machining shaping.
Preferably, the microporous pipe includes the multiple tube banks be arrangeding in parallel, adjacent tubes beam center line perpendicular to
Equilateral triangle, a line of the equilateral triangle and the LNG are projected as in the plane of the multiple tube bank
The angle of the axis direction of entrance is 30 ° or 60 °.
Preferably, the microporous pipe includes the multiple tube banks be arrangeding in parallel, adjacent tubes beam center line perpendicular to
Square is projected as in the plane of the multiple tube bank, a line of the equilateral triangle enters with the LNG
The angle of the axis direction of mouth is 90 ° or 45 °.
Preferably, adjacent tubes beam center distance and the ratio of bundle diameters are 1.2~3.
Preferably, the mixed cell is SK, SV, SX, SL or SH type static mixer.
Preferably, the BOG entrances are located at the bottom of the BOG after-condensers, are connected by cone-shaped interface
Pass to the microporous pipe.
Preferably, the BOG after-condensers are using vertical or horizontal installation.
The beneficial effect of BOG after-condensers of the invention is to be isolated into diameter by the BOG of microporous pipe
The microbubble of very little, considerably increases gas liquid interfacial area, and BOG is abundant in mixed cell with supercooling LNG
Contact, can be fully absorbed by LNG, and problem is reclaimed so as to solve BOG present in LNG receiving stations.
Additionally, the BOG after-condenser organic efficiencies of the disclosure are high, compact conformation, equipment operation easily, maintenance side
Just.
Brief description of the drawings
Exemplary embodiment of the invention is described in more detail by with reference to accompanying drawing, it is of the invention above-mentioned
And other purposes, feature and advantage will be apparent.Wherein, in exemplary embodiment of the invention
In, identical reference typically represents same parts.
Fig. 1 is the sectional view of the BOG after-condensers according to exemplary embodiment；
Fig. 2 is equilateral triangle cloth of the microporous pipe of the BOG after-condensers according to exemplary embodiment on tube sheet
Put schematic diagram；
Fig. 3 is that the equilateral triangle arrangement of the microporous pipe of the BOG after-condensers according to exemplary embodiment is illustrated
Figure；
Fig. 4 a and Fig. 4 b are the equilateral triangle cloth of the microporous pipe of the BOG after-condensers according to exemplary embodiment
Put schematic diagram；
Fig. 5 a and Fig. 5 b are the arranged in squares of the microporous pipe of the BOG after-condensers according to exemplary embodiment
Schematic diagram.
Main Reference Numerals explanation：
1：BOG entrances；2：Tube sheet；3：LNG entrances；4：Guide shell；5：Microporous pipe；6：Support
Grid；7：Mixed cell；8：LNG is exported.
Specific embodiment
The preferred embodiment of the present invention is more fully described below with reference to accompanying drawings.Although being shown in accompanying drawing
The preferred embodiment of the present invention, however, it is to be appreciated that the present invention can be realized in a variety of manners, without should be by
Embodiments set forth herein is limited.Conversely, thesing embodiments are provided so that the present invention is more saturating
It is thorough and complete, and those skilled in the art can be will fully convey the scope of the invention to.
The disclosure provides a kind of BOG after-condensers, including：Guide shell, is provided with LNG and enters on guide shell
Mouth and outlet, are provided with microporous pipe in guide shell, microporous pipe one end closing, the other end is communicated to BOG entrances,
The surface of microporous pipe is provided with micropore；And mixed cell, for being mixed, one end of mixed cell with
The outlet of guide shell, the other end is provided with LNG outlets.
In the BOG after-condensers of the disclosure, LNG enters guide shell by LNG entrances, and BOG passes through
BOG entrances enter microporous pipe, and BOG gases are divided into microbubble, discharged micro- by the micropore of micropore pipe surface
Kong Guan, the LNG being in micropore ligament carry BOG microbubbles and flow out water conservancy diversion by the outlet of guide shell
Cylinder, into the mixed cell connected with guide shell.
BOG forms microbubble, the supercooling LNG entered into outside microporous pipe by the micropore bubbling of micropore pipe surface
In, then microbubble is brought into mixed cell and is sufficiently mixed, condensed by supercooling LNG.With it is existing
BOG again compared by condensation technology, and in the BOG after-condensers of the disclosure, the BOG by microporous pipe is cut
The microbubble of diameter very little is cleaved into, gas liquid interfacial area is considerably increased, BOG is mixing single with supercooling LNG
It is fully contacted in unit, can be fully absorbed by LNG, so as to solves BOG present in LNG receiving stations
Reclaim problem.
Used as a kind of preferred scheme, described one end of microporous pipe is fixed in removable supportive grid, described another
End is fixed on tube sheet.Microporous pipe can be connected through a screw thread or Type of Welding is fixed on tube sheet.Supportive grid
It is moveable, can both fixes microporous pipe, problem on deformation of the microporous pipe under the big temperature difference can be solved again.
Used as a kind of preferred scheme, the aperture of the micropore of micropore pipe surface is 5~100 microns.
Used as a kind of preferred scheme, microporous pipe is by sinter molding or machining shaping.
Used as a kind of preferred scheme, microporous pipe includes the multiple tube banks be arrangeding in parallel, and adjacent tubes beam center line exists
Projection in the plane (such as tube sheet) of multiple tube banks forms equilateral triangle, one of equilateral triangle
Side is 30 ° with the angle of the axis direction (being represented with the direction of arrow in figs. 4 a and 4b) of LNG entrances
Or 60 °, as shown in Fig. 2, Fig. 3, Fig. 4 a and Fig. 4 b.Or, adjacent tubes beam center line perpendicular to
Projection in the planes (such as tube sheet) of multiple tube bank can also form square, foursquare a line with
The angle of the axis direction (being represented with the direction of arrow in figs. 5 a and 5b) of LNG entrances is 90 ° or 45 °.
Triangular arrangement mode compact conformation, heat-transfer effect are good, and the tube bank quantity that can be arranged on same tube sheet is than square
Shape arrangement many 10% or so is bigger hence for heat transfer area for same volume, it is adaptable to which that shell side is situated between
Matter dirt is few and need not carry out the occasion of mechanical cleaning.Arranged in squares mode forms one in interbank pipe bridge
Bar beeline channel, is easy to mechanical cleaning.When therefore needing the dirt on often cleaning tube bank outer surface, adopt more
Use arranged in squares mode.
Used as a kind of preferred scheme, adjacent tubes beam center distance is 1.2~3 with the ratio of bundle diameters.
Used as a kind of preferred scheme, mixed cell is SK, SV, SX, SL or SH type static mixer.
Type " SK ", " SV ", " SX ", " SL " and " SH " has the implication for determining in this area, herein not
It is described in detail again.Most preferably, mixed cell is SK type static mixers, its mixing plug-in part list
Unit includes the left-hand screw mixed cell and right-hand screw mixed cell that are arranged alternately, left-hand screw mixed cell and right spiral shell
The windup-degree for revolving mixed cell is 180 °.The disclosure uses microporous pipe and static mixing device, with tradition
BOG again compare by condensation technology, and compact conformation, BOG organic efficiencies are high, equipment operation is easy, easy to maintenance.
Preferably, BOG entrances are located at the bottom of BOG after-condensers, and microporous pipe is communicated to by cone-shaped interface.
According to the specific requirement of technique and engineering, BOG after-condensers can vertical or horizontal installation.Correspondingly,
The flow direction of LNG can be to flow transversely through microporous pipe (cross-flow) or parallel flow through microporous pipe (following current).
Fig. 1 shows the structural representation of the BOG after-condensers according to exemplary embodiment.BOG is condensed again
Device includes guide shell 4 and mixed cell 7.LNG entrances 3 and outlet, guide shell are provided with guide shell 4
Microporous pipe 5 is provided with 4, the one end of microporous pipe 5 closing, the other end is communicated to BOG entrances 1, microporous pipe 5
Surface be provided with micropore.Mixed cell 7 is used to be mixed, the outlet of its one end and guide shell 4,
The other end is provided with LNG outlets 8.
BOG entrances 1 are located at the bottom of BOG after-condensers, and microporous pipe 5, BOG is communicated to by cone-shaped interface
Entered in microporous pipe 5 by BOG entrances 1.
One end of microporous pipe 5 is fixed on tube sheet 2, and the other end is fixed in supportive grid 6.Microporous pipe 5
Including the multiple tube bank be arrangeding in parallel, adjacent tubes beam center line is being projected as positive three on tube sheet 2
It is angular, as shown in Figures 2 and 3.
Mixed cell 7 is SK type static mixers, including the left-hand screw mixed cell and right-hand screw being arranged alternately
The windup-degree of mixed cell, left-hand screw mixed cell and right-hand screw mixed cell is 180 °.
The course of work of the BOG after-condensers according to exemplary embodiment is as follows：The supercooling LNG of certain flow
It is flowed into guide shell 4 by the LNG entrances 3 being arranged on guide shell 4, into the tube bank of microporous pipe 5
Gap.After after supercooling LNG stream amount stabilization, BOG is entered in microporous pipe 5 by BOG entrances 1, micropore
BOG gases are divided into microbubble by the micropore on the surface of pipe 5, discharge microporous pipe 5.It is in the gap of microporous pipe 5
In supercooling LNG BOG microbubbles are loaded into the mixed cell 7 that is connected with guide shell 4.In mixed cell 7
In, LNG is sufficiently mixed with BOG, and BOG is re-condensed to LNG, and the LNG from the top of mixed cell
Outlet 8 is flowed out.
It is described above embodiments of the invention, described above is exemplary, and non-exclusive,
And it is also not necessarily limited to disclosed each embodiment.In the feelings of the scope and spirit without departing from embodiment described
Under condition, many modifications and changes will be apparent from for those skilled in the art.
The selection of term used herein, it is intended to best explain the principle and practical application of embodiment, or make this
Other those of ordinary skill of technical field are understood that embodiments disclosed herein.
Claims (10)
1. a kind of boil-off gas (BOG) after-condenser, including：
Guide shell (4), is provided with LNG entrances (3) and outlet, in the guide shell on the guide shell
Microporous pipe (5) is provided with, microporous pipe (5) one end closing, the other end is communicated to BOG entrances (1),
The surface of the microporous pipe (5) is provided with micropore；And
Mixed cell (7), for being mixed, one end and the guide shell (4) of the mixed cell (7)
Outlet, the other end be provided with LNG outlet (8).
2. BOG after-condensers according to claim 1, wherein described the one of the microporous pipe (5)
End is fixed in removable supportive grid (6), and the other end is fixed on tube sheet (2).
3. BOG after-condensers according to claim 1, wherein the microporous pipe (5) surface is micro-
The aperture in hole is 5~100 microns.
4. BOG after-condensers according to claim 1, wherein the microporous pipe (5) is by sintering
Shaping or machining shaping.
5. BOG after-condensers according to claim 1, wherein the microporous pipe (5) is including parallel
Multiple tube banks of setting, adjacent tubes beam center line being projected as in the plane perpendicular to the multiple tube bank
Equilateral triangle, a line of the equilateral triangle is with the angle of the axis direction of the LNG entrances (3)
30 ° or 60 °.
6. BOG after-condensers according to claim 1, wherein the microporous pipe (5) is including parallel
Multiple tube banks of setting, adjacent tubes beam center line being projected as in the plane perpendicular to the multiple tube bank
Square, a line of the equilateral triangle is 90 ° with the angle of the axis direction of the LNG entrances (3)
Or 45 °.
7. the BOG after-condensers according to claim 5 or 6, wherein adjacent tubes beam center distance and pipe
The ratio of beam diameter is 1.2~3.
8. BOG after-condensers according to claim 1, wherein the mixed cell (7) be SK,
SV, SX, SL or SH type static mixer.
9. BOG after-condensers according to claim 1, wherein the BOG entrances (1) are positioned at institute
The bottom of BOG after-condensers is stated, the microporous pipe (5) is communicated to by cone-shaped interface.
10. BOG after-condensers according to claim 1, wherein the BOG after-condensers are using vertical
Formula or horizontal installation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510917334.XA CN106861222B (en) | 2015-12-10 | 2015-12-10 | Evaporated gas recondenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510917334.XA CN106861222B (en) | 2015-12-10 | 2015-12-10 | Evaporated gas recondenser |
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| Publication Number | Publication Date |
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| CN106861222A true CN106861222A (en) | 2017-06-20 |
| CN106861222B CN106861222B (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510917334.XA Active CN106861222B (en) | 2015-12-10 | 2015-12-10 | Evaporated gas recondenser |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107837699A (en) * | 2017-11-01 | 2018-03-27 | 中石化广州工程有限公司 | A kind of liquefied natural gas Liqiud-gas mixing device |
| CN107961686A (en) * | 2017-11-03 | 2018-04-27 | 中石化广州工程有限公司 | A kind of liquefied natural gas gas-liquid pre-mixing apparatus |
| CN108006435A (en) * | 2017-11-03 | 2018-05-08 | 中石化广州工程有限公司 | Liquefied natural gas gas-liquid pre-mixing apparatus |
| CN108020024A (en) * | 2017-11-01 | 2018-05-11 | 中石化广州工程有限公司 | Liquefied natural gas after-condenser device |
| CN110193300A (en) * | 2018-02-27 | 2019-09-03 | 中石化广州工程有限公司 | A kind of LNG after-condenser gas-liquid mixed uniform device |
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| CN108020024B (en) * | 2017-11-01 | 2019-10-22 | 中石化广州工程有限公司 | Liquefied natural gas after-condenser device |
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| CN110193300A (en) * | 2018-02-27 | 2019-09-03 | 中石化广州工程有限公司 | A kind of LNG after-condenser gas-liquid mixed uniform device |
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|---|---|
| CN106861222B (en) | 2020-03-06 |
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