CN203743842U - Recovery system of BOG (Boil Off Gas) of normal-pressure low-temperature LNG (Liquefied Natural Gas) storage tank - Google Patents
Recovery system of BOG (Boil Off Gas) of normal-pressure low-temperature LNG (Liquefied Natural Gas) storage tank Download PDFInfo
- Publication number
- CN203743842U CN203743842U CN201420140549.6U CN201420140549U CN203743842U CN 203743842 U CN203743842 U CN 203743842U CN 201420140549 U CN201420140549 U CN 201420140549U CN 203743842 U CN203743842 U CN 203743842U
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- China
- Prior art keywords
- storage tank
- pipeline
- bog
- threeway
- temperature lng
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000007789 gas Substances 0.000 title abstract 2
- 238000011084 recovery Methods 0.000 title abstract 2
- 239000003949 liquefied natural gas Substances 0.000 title 2
- 239000002737 fuel gas Substances 0.000 claims abstract description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 238000007701 flash-distillation Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model discloses a recovery system of BOG (Boil Off Gas) of a normal-pressure low-temperature LNG (Liquefied Natural ) storage tank. The normal-pressure low-temperature LNG storage tank is equipped with an electro connecting pressure gauge and a safety valve, wherein a tee joint is arranged on an outlet pipeline 20m away from an outlet of the normal-pressure low-temperature LNG storage tank; one pipeline of the tee joint passes through an automatic shutdown valve and then is connected with a heat exchanger; another pipeline of the tee joint is connected with a bypass pipeline; the bypass pipeline is also equipped with an automatic shutdown valve; an outlet pipeline of the automatic shutdown valve and an outlet pipeline of the heat exchanger are connected with a tee joint; and an outlet pipeline of the tee joint is connected into a fuel gas utilization system via a BOG compressor.The system has the benefits that all flash evaporation BOG of the normal-pressure low-temperature LNG storage tank is recycled, field discharge of the BOG is precluded, and the safety is improved.
Description
Technical field
The present invention relates to the reclaiming system of a kind of atmospheric low-temperature LNG storage tank BOG, be applicable to the recycling of the BOG of atmospheric low-temperature LNG storage tank flash distillation.
Background technique
In recent years, along with a large amount of constructions of LNG factory of China, extensively adopt the storage facilities of atmospheric low-temperature LNG storage tank as low temperature LNG, but the BOG of atmospheric low-temperature LNG storage tank operation flash distillation, because BOG heat exchanger channel resistance is large, the BOG of part atmospheric low-temperature LNG storage tank operation flash distillation can not all reclaim and cause LNG pressure of storage tank to be increased to discharge setting pressure, and automatic control pressure vent is opened and drained in atmosphere, can cause security risk and energy waste.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the utility model provides the reclaiming system of a kind of atmospheric low-temperature LNG storage tank BOG.
The technical solution of the utility model is: the reclaiming system of a kind of atmospheric low-temperature LNG storage tank BOG, comprise: atmospheric low-temperature LNG storage tank, heat exchanger, BOG compressor, fuel gas utilizes system, described atmospheric low-temperature LNG storage tank is equipped with pressure gauge with electric contact, between described atmospheric low-temperature LNG storage tank and BOG compressor, be connected a by-pass line, between described atmospheric low-temperature LNG storage tank and heat exchanger, pipeline is provided with the first threeway, on one end pipeline of the first threeway connecting bypass pipeline, be provided with pipe diameter is become to large loudspeaker reducer pipe, described by-pass line is equipped with automatic cut-off valve, described heat exchanger inlet pipeline is equipped with automatic cut-off valve, between described heat exchanger and BOG compressor, pipeline is provided with the second threeway, on one end pipeline of the second threeway connecting bypass pipeline, be provided with loudspeaker reducer pipe, reducing is to former pipe diameter size.
Described the first threeway is arranged on atmospheric low-temperature LNG storage tank outlet conduit and apart from 20 meters of of storage tank mouth, the first threeway import is DN50 pipeline, exporting a road is the pipeline connection automatic cut-off valve of DN50, another route DN50 loudspeaker reducing connects automatic cut-off valve to DN100 pipeline, described the second threeway import one tunnel is that DN50 pipeline connects heat exchanger, another road of import connects automatic cut-off valve, centre arranges loudspeaker reducer pipe, from automatic cut-off valve to the second threeway direction caliber by DN100 reducing to DN50, outlet one tunnel is that DN50 pipeline connects BOG compressor.
Described by-pass line is DN100 Stainless Steel Tube, is 100 meters from the one or three distance of leading to the second threeway.
Compared with prior art, the beneficial effects of the utility model are: the BOG of atmospheric low-temperature LNG storage tank flash distillation can all recycle, and have stopped the on-the-spot discharge of BOG, have improved Security.
Brief description of the drawings
The structural representation that Fig. 1 provides for the utility model.
In figure: 1. atmospheric low-temperature LNG storage tank, 2. pressure gauge with electric contact, 3. safety valve, 4. the first threeway, 5. automatic cut-off valve, 6. automatic cut-off valve, 7. heat exchanger, 8. by-pass line, 9 second threeways, 10. BOG compressor, 11. fuel gas utilize system.
Embodiment
In order more clearly to understand the technical solution of the utility model, below in conjunction with accompanying drawing, the utility model is described in further detail.
The reclaiming system of a kind of atmospheric low-temperature LNG storage tank BOG as shown in Figure 1, atmospheric low-temperature LNG storage tank 1 is equipped with pressure gauge with electric contact 2 and safety valve 3, the outlet conduit that exports 20 meters of apart from atmospheric low-temperature LNG storage tank 1 is provided with the first threeway 4, the first threeway 4 one road pipelines connect heat exchanger 7 after automatic cut-off valve 5, another road pipeline connects automatic cut-off valve 6, the outlet line of automatic cut-off valve 6 is connected the second threeway 9, the second threeways 9 outlet line with the outlet line of heat exchanger 7 accesses fuel gas through BOG compressor 10 and utilizes system 11.
Atmospheric low-temperature LNG storage tank 1 outlet line and heat exchanger inlet and outlet pipeline are DN50 pipeline, the length of by-pass line 8 is from 100 meters of the distances of the first threeway 4 to second threeways 9, by-pass line 8 is DN100 Stainless Steel Tube, the first threeway 4 exports a route DN50 loudspeaker reducing to connecting bypass pipeline 8 after DN100, and by-pass line 8 exports end and to DN50, connects the second threeway 9 by DN100 loudspeaker reducing.
Pressure gauge with electric contact 2, automatic cut-off valve 5 all access central control system with the electrical signal of automatic cut-off valve 6, and the electrical signal of pressure gauge with electric contact 2 passes to central control system, opening or closing by central control system control automatic cut-off valve 5 and automatic cut-off valve 6.
In work, for the sake of security, when the BOG pressure of atmospheric low-temperature LNG storage tank 1 flash distillation exceedes 16Kpa, safety valve 3 is opened the BOG of flash distillation from top emptying.
Under normal circumstances, in the time that the pressure gauge with electric contact 2 of atmospheric low-temperature LNG storage tank 1 detects pressure lower than 10 Kpa, central control system control automatic cut-off valve 5 is opened rear automatic cut-off valve 6 and is closed, BOG enters BOG compressor (10) by heat exchanger 7 pipelines, in the time detecting that pressure reaches 10 Kpa, central control system control automatic cut-off valve 6 is opened rear automatic cut-off valve 5 and is closed, and BOG enters BOG compressor (10) by by-pass line 8.100 meters of long Stainless Steel Tubes that by-pass line 8 is DN100, large with the area of contact of ambient air, can play the effect of heat exchange, can ensure the inlet temperature requirement of BOG compressor, because the current greatly resistance of pipe diameter is little, the pressure of atmospheric low-temperature LNG storage tank 1 can not be elevated to safety valve setting pressure, and BOG is all by BOG compressor compresses and be sent to fuel gas and utilize system 11, then gives fuel air-conditioning fuel boiler and use.
The above is only preferred embodiments of the present utility model, and the equivalence of doing according to structure, feature and principle described in the utility model patent claim therefore all changes or modifies, and is included in the utility model patent claim.
Claims (3)
1. the reclaiming system of an atmospheric low-temperature LNG storage tank BOG, comprise: atmospheric low-temperature LNG storage tank (1), heat exchanger (7), BOG compressor (10), fuel gas utilizes system (11), it is characterized in that: described atmospheric low-temperature LNG storage tank (1) is equipped with pressure gauge with electric contact (2), between described atmospheric low-temperature LNG storage tank (1) and BOG compressor (10), be connected a by-pass line (8), between described atmospheric low-temperature LNG storage tank (1) and heat exchanger (7), pipeline is provided with the first threeway (4), on one end pipeline of the first threeway (4) connecting bypass pipeline (8), be provided with pipe diameter is become to large loudspeaker reducer pipe, described by-pass line (8) is equipped with automatic cut-off valve (6), described heat exchanger (7) inlet pipeline is equipped with automatic cut-off valve (5), between described heat exchanger (7) and BOG compressor (10), pipeline is provided with the second threeway (9), on one end pipeline of the second threeway (9) connecting bypass pipeline (8), be provided with loudspeaker reducer pipe, reducing is to former pipe diameter size.
2. the reclaiming system of a kind of atmospheric low-temperature LNG storage tank BOG according to claim 1, it is characterized in that: described the first threeway (4) is arranged on atmospheric low-temperature LNG storage tank (1) outlet conduit and apart from 20 meters of of storage tank mouth, the first threeway (4) import is DN50 pipeline, exporting a road is the pipeline connection automatic cut-off valve (5) of DN50, another route DN50 loudspeaker reducing connects automatic cut-off valve (6) to DN100 pipeline, described the second threeway (9) import one tunnel is that DN50 pipeline connects heat exchanger (7), another road of import connects automatic cut-off valve (6), centre arranges loudspeaker reducer pipe, from automatic cut-off valve (6) to the second threeway (9) direction caliber by DN100 reducing to DN50, exporting a road is that DN50 pipeline connects BOG compressor (10).
3. the reclaiming system of a kind of atmospheric low-temperature LNG storage tank BOG according to claim 1, is characterized in that: described by-pass line (8) is DN100 Stainless Steel Tube, is 100 meters from the first threeway (4) to the distance of the second threeway (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420140549.6U CN203743842U (en) | 2014-03-27 | 2014-03-27 | Recovery system of BOG (Boil Off Gas) of normal-pressure low-temperature LNG (Liquefied Natural Gas) storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420140549.6U CN203743842U (en) | 2014-03-27 | 2014-03-27 | Recovery system of BOG (Boil Off Gas) of normal-pressure low-temperature LNG (Liquefied Natural Gas) storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203743842U true CN203743842U (en) | 2014-07-30 |
Family
ID=51343643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420140549.6U Expired - Lifetime CN203743842U (en) | 2014-03-27 | 2014-03-27 | Recovery system of BOG (Boil Off Gas) of normal-pressure low-temperature LNG (Liquefied Natural Gas) storage tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203743842U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105090739A (en) * | 2015-08-29 | 2015-11-25 | 华南理工大学 | Multifunctional intelligent scattered natural gas recovery device and method thereof |
| WO2017196310A1 (en) | 2016-05-11 | 2017-11-16 | Innovative Cryogenic Systems, Inc. | Gas storage and treatment installation |
-
2014
- 2014-03-27 CN CN201420140549.6U patent/CN203743842U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105090739A (en) * | 2015-08-29 | 2015-11-25 | 华南理工大学 | Multifunctional intelligent scattered natural gas recovery device and method thereof |
| WO2017196310A1 (en) | 2016-05-11 | 2017-11-16 | Innovative Cryogenic Systems, Inc. | Gas storage and treatment installation |
| JP2019516917A (en) * | 2016-05-11 | 2019-06-20 | イノベイティブ クライオジェニック システムズ， インコーポレイテッド | Gas storage and processing equipment |
| EP3455545A4 (en) * | 2016-05-11 | 2020-01-22 | Innovative Cryogenic Systems, Inc. | GAS STORAGE AND PROCESSING FACILITY |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140730 |