CN107461601B - A kind of BOG treatment process under the abnormal operation operating condition for LNG receiving station - Google Patents
A kind of BOG treatment process under the abnormal operation operating condition for LNG receiving station Download PDFInfo
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- CN107461601B CN107461601B CN201710827681.2A CN201710827681A CN107461601B CN 107461601 B CN107461601 B CN 107461601B CN 201710827681 A CN201710827681 A CN 201710827681A CN 107461601 B CN107461601 B CN 107461601B
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- liquid nitrogen
- lng
- storage tank
- heat exchanger
- nitrogen
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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
- F17C5/04—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases requiring the use of refrigeration, e.g. filling with helium or hydrogen
-
- 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
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
-
- 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
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
Abstract
The invention discloses the BOG treatment process and device under a kind of abnormal operation operating condition for LNG receiving station, which includes LNG storage tank, low pressure BOG compressor, liquid nitrogen heat exchanger, low temperature nitrogen sky bath heater and liquid nitrogen storage tank；The one outlet of the LNG storage tank passes through the inlet communication of pipeline and low pressure BOG compressor, another outlet of LNG storage tank passes through the side inlet communication of pipeline and liquid nitrogen heat exchanger；The outlet of the low pressure BOG compressor passes through the side inlet communication of pipeline and liquid nitrogen heat exchanger；The inlet communication that the side exit of the liquid nitrogen heat exchanger passes through return tank line and LNG storage tank；The bottom inlet of the liquid nitrogen heat exchanger is connected to by pipeline with the lower part outlet of liquid nitrogen storage tank.Simple process of the invention, low energy consumption, small investment；The device of the invention is practical, is suitable under damage, and the BOG of LNG receiving station is handled；Using LNG liquid nitrogen heat exchanger liquefaction BOG or be subcooled in storage tank, to achieve the purpose that eliminate BOG.
Description
Technical field
The present invention relates to LNG receiving station BOG processing technology fields, specifically a kind of improper for LNG receiving station
Operate the BOG treatment process under operating condition.
Background technique
LNG (Liquefied Natural Gas) is the abbreviation of liquefied natural gas, it takes full advantage of natural gas in normal pressure
After liquefying at -162 DEG C, 1/600 this property when volume can narrow down to gaseous state conveys for High-efficiency Gas and provides new way
The application field of natural gas has also been enlarged in diameter.Planned according to national energy, ratio of the natural gas in energy-consuming year by year on
It rises, it is contemplated that 10% or so of the entire energy resource structure in the year two thousand twenty station.
LNG belongs to super-low liquid, although storage tank has good cold insulation thermal-insulation function in storage, still there is heat unavoidably
In incoming tank, LNG is caused to evaporate to be formed BOG (boil-off gas), this part BOG needs processing in time, otherwise can cause to store up
Tank superpressure causes emptying to torch.
At present under receiving station's normal operating operating condition, BOG treatment process mainly uses recondensation process.When receiving station is non-
When normal operating operating condition, generallys use traditional liquefaction mode (azeotrope, nitrogen expansion etc.) and carry out recycling BOG, but energy consumption
It is larger, complicated for operation.
Summary of the invention
Technical assignment of the invention is to provide the BOG treatment process under a kind of abnormal operation operating condition for LNG receiving station.
Technical assignment of the invention is realized in the following manner:
A kind of BOG processing unit under the abnormal operation operating condition for LNG receiving station, including LNG storage tank, low pressure BOG pressure
Contracting machine, liquid nitrogen heat exchanger, low temperature nitrogen sky bath heater and liquid nitrogen storage tank；
The one outlet of the LNG storage tank by the inlet communication of pipeline and low pressure BOG compressor, LNG storage tank it is another
One outlet passes through the side inlet communication of pipeline and liquid nitrogen heat exchanger；
The outlet of the low pressure BOG compressor passes through the side inlet communication of pipeline and liquid nitrogen heat exchanger；
The top exit of the liquid nitrogen heat exchanger bathes the inlet communication of heater by pipeline and low temperature nitrogen sky；It is described
Liquid nitrogen heat exchanger side exit by return tank line and LNG storage tank inlet communication；The liquid nitrogen heat exchanger
Bottom inlet is connected to by pipeline with the lower part outlet of liquid nitrogen storage tank；
The outlet of the described low temperature nitrogen sky bath heater is respectively communicated to the nitrogen pipeline of receiving station and industrial to other
The nitrogen pipeline of user；
The bottom inlet of the liquid nitrogen storage tank makes up line with liquid nitrogen to be connected to.
Bottom in the LNG storage tank is equipped with LNG low-lift pump；
The LNG low-lift pump in pipeline one end and LNG storage tank that the LNG storage tank is connected to the liquid nitrogen heat exchanger connects
It is logical.
Isolating valve two is installed on the pipeline that the LNG storage tank is connected to the liquid nitrogen heat exchanger.
Isolating valve one is installed on the pipeline that the low pressure BOG compressor is connected to the liquid nitrogen heat exchanger.
The side of the low temperature nitrogen sky bath heater has been installed in parallel by-pass line, the front end of the by-pass line
It is connected to the inlet line of the low temperature nitrogen sky bath heater, the rear end of the by-pass line and the low temperature nitrogen
The outlet line connection of sky bath heater.
Bypass valve is installed on the by-pass line.
Regulating valve one is installed on the return tank line.
Regulating valve two is installed on the pipeline that the liquid nitrogen heat exchanger is connected to the liquid nitrogen storage tank.
A kind of BOG treatment process under the abnormal operation operating condition for LNG receiving station, includes the following steps:
1) BOG compression and liquefaction: will be from LNG storage tank and BOG that temperature is -150~-120 DEG C inputs low pressure BOG compression
Machine, is pressurized to 0.5~0.8MPaG, and outlet temperature -10~40 DEG C are liquefied after then inputting liquid nitrogen heat exchanger, are delivered to later
LNG storage tank；
2) LNG conveying and supercooling: via the LNG low-lift pump in LNG storage tank, LNG is conveyed to liquid nitrogen heat exchanger, by liquid nitrogen
After cooling, temperature is about -162~-165 DEG C, is delivered to LNG storage tank later；
3) liquid nitrogen heat exchanger exchanges heat: the low temperature liquid nitrogen from liquid nitrogen storage tank enters liquid nitrogen heat exchanger, and liquefaction comes from low pressure BOG
The BOG of compressor, or the supercooling LNG from LNG low-lift pump, BOG and LNG stream do not enter liquid nitrogen heat exchanger simultaneously；Rewarming
Nitrogen afterwards is delivered in LNG receiving station and other neighbouring industrial users；
4) low temperature nitrogen sky bathes heater re-heat: the nitrogen from liquid nitrogen heat exchanger passes through at this time there are when the operating condition of low temperature
Low temperature nitrogen sky bath heater is crossed, re-heat low temperature nitrogen is delivered in LNG receiving station and other neighbouring industrial users later；
5) liquid nitrogen storage tank: liquid nitrogen storage tank provides liquid nitrogen, while the public Nitrogen pipe network with LNG receiving station for liquid nitrogen heat exchanger
Connection is used as bailout gas, when traditional nitrogen-making device is unable to satisfy demand, then provides nitrogen needed in station by liquid nitrogen storage tank.
Liquid nitrogen in the liquid nitrogen storage tank is filled by the space division of neighbouring Large LNG cold energy space division factory or grapefruit satellite gasification station
It sets and is made up line offer by liquid nitrogen.
BOG treatment process under a kind of abnormal operation operating condition for LNG receiving station of the invention compared to the prior art,
Simple process of the invention, low energy consumption, small investment；The device of the invention is practical, is suitable under damage, LNG connects
Receive the BOG processing at station；Using LNG liquid nitrogen heat exchanger liquefaction BOG or be subcooled in storage tank, to achieve the purpose that eliminate BOG.
Detailed description of the invention
Attached drawing 1 is a kind of structural schematic diagram of the BOG processing unit under abnormal operation operating condition for LNG receiving station.
In figure: 1, LNG low-lift pump, 2, LNG storage tank, 3, low pressure BOG compressor, 4, isolating valve one, 5, isolating valve two, 6, liquid
Nitrogen heat exchanger, 7, bypass valve, 8, low temperature nitrogen sky bath heater, 9, return tank line, 10, liquid nitrogen storage tank, 11, regulating valve
One, 12, liquid nitrogen make up line, 13, to the nitrogen pipeline of receiving station, 14, to the nitrogen pipeline of other industrial users, 15, adjust
Valve two, 16, by-pass line.
Specific embodiment
Installation is for the BOG processing unit under LNG receiving station abnormal operation operating condition, including LNG storage tank 2, low pressure BOG pressure
Contracting machine 3, liquid nitrogen heat exchanger 6, low temperature nitrogen sky bath heater 8 and liquid nitrogen storage tank 10；
The one outlet of the LNG storage tank 2 passes through the inlet communication of pipeline and low pressure BOG compressor 3, the LNG
Bottom in storage tank 2 is equipped with LNG low-lift pump 1；
Another outlet of the LNG storage tank 2 passes through the side inlet communication of pipeline and liquid nitrogen heat exchanger 6；Described
Pipeline one end that LNG storage tank 2 is connected to the liquid nitrogen heat exchanger 6 is connected to the LNG low-lift pump 1 in LNG storage tank 2.Described
Isolating valve 25 is installed on the pipeline that LNG storage tank 2 is connected to the liquid nitrogen heat exchanger 6.
The outlet of the low pressure BOG compressor 3 passes through the side inlet communication of pipeline and liquid nitrogen heat exchanger 6；Described
Isolating valve 1 is installed on the pipeline that low pressure BOG compressor 3 is connected to the liquid nitrogen heat exchanger 6.
The top exit of the liquid nitrogen heat exchanger 6 bathes the inlet communication of heater 8 by pipeline and low temperature nitrogen sky；Institute
The inlet communication that the side exit for the liquid nitrogen heat exchanger 6 stated passes through return tank line 9 and LNG storage tank 2；The return storage tank
Regulating valve 1 is installed on pipeline 9；The bottom inlet of the liquid nitrogen heat exchanger 6 passes through the lower part of pipeline and liquid nitrogen storage tank 10
Outlet；Regulating valve 2 15 is installed on the pipeline that the liquid nitrogen heat exchanger 6 is connected to the liquid nitrogen storage tank 10.
The outlet of the described low temperature nitrogen sky bath heater 8 is respectively communicated to the nitrogen pipeline 13 of receiving station and to other work
The nitrogen pipeline 14 of industry user；The side of the low temperature nitrogen sky bath heater 8 has been installed in parallel by-pass line 16, described
The front end of by-pass line 16 is connected to the inlet line of the low temperature nitrogen sky bath heater 8, the by-pass line 16
Rear end is connected to the outlet line of the low temperature nitrogen sky bath heater 8；Bypass valve is installed on the by-pass line 16
7。
The bottom inlet of the liquid nitrogen storage tank 10 and liquid nitrogen, which make up line, 12 to be connected to.
Embodiment 1:
The process flow of BOG is directly condensed using liquid nitrogen:
Enter low pressure BOG compressor 3 from the BOG 1.5t/h that 2 temperature of LNG storage tank is -150 DEG C, be pressurized to 0.7MPaG,
2 DEG C of outlet temperature, enters liquid nitrogen heat exchanger 6 later and liquid nitrogen exchanges heat, condensed BOG temperature is -161 DEG C, by regulating valve
One 11 decompressions, into tank line 9 is returned, final liquefied BOG returns to LNG storage tank 2, achievees the purpose that recycle BOG.
Liquid nitrogen comes from liquid nitrogen storage tank 10, and temperature is -196 DEG C, flow 3.13t/h, after BOG heat exchange, nitrogen outlet temperature
Degree is -5 DEG C, and low temperature nitrogen, to room temperature, is respectively enterd to the nitrogen pipeline of receiving station by low temperature nitrogen sky bath 8 rewarming of heater
13 and to other industrial users nitrogen pipeline 14, provide nitrogen gas source for downstream user.
Liquid nitrogen in the liquid nitrogen storage tank 10 is by neighbouring Large LNG cold energy space division factory or the space division of grapefruit satellite gasification station
Device is made up line offer by liquid nitrogen.
Embodiment 2:
The process flow of LNG is directly subcooled using liquid nitrogen:
Enter liquid nitrogen heat exchanger 6 from the LNG 45t/h that 2 temperature of LNG storage tank is -160 DEG C, the LNG temperature after being subcooled
- 165 DEG C are down to, is depressurized by regulating valve 1, into tank line 9 is returned, the LNG being finally subcooled returns to LNG storage tank 2, disappears
Except the heat that LNG storage tank 2 is absorbed, achieve the purpose that inhibit BOG evaporation.
Liquid nitrogen comes from liquid nitrogen storage tank 10, and temperature is -196 DEG C, flow 3.6t/h, after BOG heat exchange, nitrogen outlet temperature
It is -161 DEG C, low temperature nitrogen, to room temperature, is respectively enterd to the nitrogen pipeline of receiving station by low temperature nitrogen sky bath 8 rewarming of heater
13 and to other industrial users nitrogen pipeline 14, provide nitrogen gas source for downstream user.
Liquid nitrogen in the liquid nitrogen storage tank 10 is by neighbouring Large LNG cold energy space division factory or the space division of grapefruit satellite gasification station
Device is made up line offer by liquid nitrogen.
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 embodiments.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 (2)
1. the BOG treatment process under a kind of abnormal operation operating condition for LNG receiving station, which comprises the steps of:
1) BOG compression and liquefaction: will come from LNG storage tank and temperature is -150~-120oThe BOG of C inputs low pressure BOG compressor, increases
It is depressed into 0.5~0.8 MPaG, outlet temperature -10~40oC is liquefied after then inputting liquid nitrogen heat exchanger, is delivered to LNG later
Storage tank；
2) LNG conveying and supercooling: via the LNG low-lift pump in LNG storage tank, LNG is conveyed to liquid nitrogen heat exchanger, by liquid nitrogen cooling
Later, temperature is -162~-165oC is delivered to LNG storage tank later；
3) liquid nitrogen heat exchanger exchanges heat: the low temperature liquid nitrogen from liquid nitrogen storage tank enters liquid nitrogen heat exchanger, and liquefaction is compressed from low pressure BOG
The BOG of machine, or the supercooling LNG from LNG low-lift pump, BOG and LNG stream do not enter liquid nitrogen heat exchanger simultaneously；After rewarming
Nitrogen is delivered in LNG receiving station and other neighbouring industrial users；
4) low temperature nitrogen sky bathes heater re-heat: the nitrogen from liquid nitrogen heat exchanger, there are when the operating condition of low temperature, at this time through too low
Warm nitrogen sky bathes heater, and re-heat low temperature nitrogen is delivered in LNG receiving station and other neighbouring industrial users later；
5) liquid nitrogen storage tank: liquid nitrogen storage tank provides liquid nitrogen for liquid nitrogen heat exchanger, while being connected to the public Nitrogen pipe network of LNG receiving station
As bailout gas, when traditional nitrogen-making device is unable to satisfy demand, then nitrogen needed in station is provided by liquid nitrogen storage tank；
The device that the treatment process uses includes LNG storage tank, low pressure BOG compressor, liquid nitrogen heat exchanger, the bath of low temperature nitrogen sky
Heater and liquid nitrogen storage tank；
The one outlet of the LNG storage tank by the inlet communication of pipeline and low pressure BOG compressor, LNG storage tank another
Outlet passes through the side inlet communication of pipeline and liquid nitrogen heat exchanger；Bottom in the LNG storage tank is equipped with LNG low-lift pump；
Pipeline one end that the LNG storage tank is connected to the liquid nitrogen heat exchanger is connected to the LNG low-lift pump in LNG storage tank；It is described
The pipeline that is connected to the liquid nitrogen heat exchanger of LNG storage tank on isolating valve two is installed；The low pressure BOG compressor and institute
Isolating valve one is installed on the pipeline for the liquid nitrogen heat exchanger connection stated；The outlet of the low pressure BOG compressor by pipeline with
The side inlet communication of liquid nitrogen heat exchanger；
The top exit of the liquid nitrogen heat exchanger bathes the inlet communication of heater by pipeline and low temperature nitrogen sky；The liquid
The side exit of nitrogen heat exchanger passes through the inlet communication for returning to tank line and LNG storage tank, pacifies on the return tank line
Equipped with regulating valve one；The bottom inlet of the liquid nitrogen heat exchanger is connected to by pipeline with the lower part outlet of liquid nitrogen storage tank；It is described
The pipeline that is connected to the liquid nitrogen storage tank of liquid nitrogen heat exchanger on regulating valve two is installed；
The outlet of the described low temperature nitrogen sky bath heater is respectively communicated to the nitrogen pipeline of receiving station and to other industrial user
Nitrogen pipeline, the side of the described low temperature nitrogen sky bath heater has been installed in parallel by-pass line, the by-pass line
Front end is connected to the inlet line of the low temperature nitrogen sky bath heater, the rear end of the by-pass line and the low temperature
Nitrogen sky bathes the outlet line connection of heater；Bypass valve is installed on the by-pass line；
The bottom inlet of the liquid nitrogen storage tank makes up line with liquid nitrogen to be connected to.
2. the BOG treatment process according to claim 1 under LNG receiving station abnormal operation operating condition, feature exist
In the liquid nitrogen in the liquid nitrogen storage tank is led to by the air separation unit of neighbouring Large LNG cold energy space division factory or grapefruit satellite gasification station
Liquid nitrogen is crossed to make up line offer.
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| CN201710827681.2A CN107461601B (en) | 2017-09-14 | 2017-09-14 | A kind of BOG treatment process under the abnormal operation operating condition for LNG receiving station |
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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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|---|---|---|---|---|
| CN108278488A (en) * | 2018-03-27 | 2018-07-13 | 铁岭陆平专用汽车有限责任公司 | Liquid nitrogen pump vehicle |
| CN109681776B (en) * | 2019-01-15 | 2021-04-06 | 江苏科技大学 | BOG reliquefaction and LNG regasification integrated system and working method |
| US11717784B1 (en) | 2020-11-10 | 2023-08-08 | Solid State Separation Holdings, LLC | Natural gas adsorptive separation system and method |
| CN113983348A (en) * | 2021-11-16 | 2022-01-28 | 江南造船(集团)有限责任公司 | Liquid nitrogen constant-temperature subcooler for LNG (liquefied Natural gas) filling |
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| EP2501984B1 (en) * | 2009-11-18 | 2013-10-16 | Shell Internationale Research Maatschappij B.V. | Method and apparatus for handling a boil-off gas stream |
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| KR20130119732A (en) * | 2012-04-24 | 2013-11-01 | 주식회사 포스코 | Apparatus for operating l.n.g. and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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