CN210485258U - Natural gas liquid storage pot evaporation collecting system - Google Patents
Natural gas liquid storage pot evaporation collecting system Download PDFInfo
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- CN210485258U CN210485258U CN201921509181.5U CN201921509181U CN210485258U CN 210485258 U CN210485258 U CN 210485258U CN 201921509181 U CN201921509181 U CN 201921509181U CN 210485258 U CN210485258 U CN 210485258U
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- bog
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- lng
- compressor
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Abstract
The utility model discloses a natural gas liquid storage pot evaporation collecting system, including the natural gas evaporation gas in the LNG storage pot, can get into first collection subsystem after introducing the BOG buffer tank, make the natural gas evaporation gas can directly carry to the defeated pipeline through the three-way valve after first BOG compressor compression, can also carry to the CNG gas column of filling after the CNG compressor compression, carry CNG to the CNG tank wagon by the CNG gas column of filling again, can increase the natural gas evaporation gas collection mode, reduce the energy consumption of first BOG compressor; the waste phenomenon can not be generated; the natural gas boil-off gas in the LNG storage tank can also enter the second collection subsystem after being introduced into the BOG buffer tank, so that the natural gas boil-off gas is compressed by the second BOG compressor and is conveyed to the BOG storage tank, the natural gas boil-off gas in the BOG storage tank is conveyed to the LNG tank wagon in a pressurized mode through the booster pump, when the LNG tank wagon unloads LNG to the LNG storage tank, pressure is provided in the LNG tank wagon, and unloading efficiency of the LNG tank wagon is accelerated.
Description
Technical Field
The utility model relates to a natural gas evaporation gas collecting system field especially relates to a natural gas liquid storage pot evaporation collecting system.
Background
The existing method for treating natural gas Boil Off Gas (BOG) in an LNG storage tank is generally 1. a direct flare combustion method, which can affect the environment and cause great waste; 2. direct external infusion method: the natural gas evaporation gas in the LNG storage tank is introduced into the BOG buffer tank, and then the natural gas evaporation gas in the BOG buffer tank is directly conveyed to an outward conveying pipeline through the BOG compressor. 3. And (3) a re-condensation method: the method comprises the steps that natural gas evaporation gas in an LNG storage tank enters a recondenser after being pressurized by a BOG compressor, and is subjected to cold quantity exchange with LNG pumped out by an LNG storage tank, so that the natural gas vapor is liquefied in the recondenser, and then enters a high-pressure vaporizer after being pressurized by a high-pressure pump for gasification and external transmission, the cold quantity of the LNG can be utilized by a recondensing process, the consumption of compression work of the natural gas evaporation gas is reduced, and therefore energy consumption is saved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a natural gas liquid storage pot evaporation collecting system that can rationally collect or utilize natural gas boil-off gas (BOG) in the LNG storage tank reduces the energy consumption is provided.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: the utility model provides a natural gas liquid storage pot evaporation collecting system which characterized in that: the system comprises an LNG storage tank, a BOG buffer tank, a first collection subsystem and a second collection subsystem;
the top of the LNG storage tank is provided with a steam outlet, and an inlet of the BOG buffer tank is communicated with the steam outlet of the LNG storage tank through a pipeline; the BOG buffer tank is respectively communicated with the first collecting subsystem and the second collecting subsystem by virtue of pipelines;
the first collecting subsystem comprises a first BOG compressor, a CNG gas column, a CNG tank car and an outward transportation pipeline; an inlet of the first BOG compressor is communicated with an outlet of the BOG buffer tank through a pipeline, and the first BOG compressor, the CNG gas column and the CNG tank car are sequentially communicated through the pipeline; the pipelines of the first BOG compressor and the CNG compressor are connected with a three-way valve, and the first BOG compressor can be communicated with an outgoing pipeline by means of the three-way valve;
the second collecting subsystem comprises a second BOG compressor, a BOG storage tank, a booster pump and an LNG tank wagon; an inlet of the second BOG compressor is communicated with the other outlet of the BOG buffer tank through a pipeline, and the second BOG compressor, the BOG storage tank, the booster pump and the LNG tank wagon are sequentially communicated through the pipeline; the booster pump can carry the natural gas evaporation gas in the BOG holding vessel to LNG tank wagon in for the pressurization of unloading of LNG tank wagon.
The further technical scheme is as follows: and a first control valve for controlling the on-off of the first BOG compressor is arranged on a pipeline between the first BOG compressor and the BOG buffer tank.
The further technical scheme is as follows: and a second control valve for controlling the on-off of the second BOG compressor is arranged on a pipeline between the second BOG compressor and the BOG buffer tank.
The further technical scheme is as follows: fixed mounting has a pressure detection indicator on the BOG buffer tank, and a pressure value that pressure detection indicator can detect and instruct the inside natural gas evaporation gas of BOG buffer tank.
The further technical scheme is as follows: fixed mounting has the second pressure detection indicator on the BOG holding vessel, and the second pressure detection indicator can detect and instruct the pressure value of the inside natural gas evaporation gas of BOG holding vessel jar.
The further technical scheme is as follows: and a pressure regulating valve is arranged on a pipeline connected with the outlet of the booster pump.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the natural gas boil-off gas in the LNG storage tank can enter the first collection subsystem after being introduced into the BOG buffer tank, so that the natural gas boil-off gas can be directly conveyed to an external conveying pipeline through the three-way valve after being compressed by the first BOG compressor, can also be conveyed to the CNG compressor to be compressed into CNG and conveyed to the CNG gas column, and then the CNG gas column conveys the CNG into a CNG tank car; the CNG compressor compresses natural gas evaporation gas into CNG, and the CNG is conveyed to a CNG tank car through a CNG filling column, and the CNG can be conveyed to a nearby CNG filling station through the CNG tank car, so that the natural gas evaporation gas is reasonably collected and utilized; the waste phenomenon can not be generated;
the natural gas boil-off gas in the LNG storage tank can enter a second collection subsystem after being introduced into the BOG buffer tank, so that the natural gas boil-off gas is compressed by a second BOG compressor and is conveyed to the BOG storage tank, the natural gas boil-off gas in the BOG storage tank is conveyed to the LNG tank wagon in a pressurizing mode through the pressurizing pump, when the LNG tank wagon unloads the LNG into the LNG storage tank, pressure is provided for the LNG storage tank, the unloading efficiency of the LNG tank wagon is improved, the pressure during unloading of the traditional LNG tank wagon is used for providing unloading pressure for the LNG tank wagon after the LNG in the LNG tank wagon is gasified by the gasifier through the unloading pressurizing pry, the loss of the LNG can be caused, and the transportation cost is increased; but carry to the LNG tank wagon through the natural gas evaporation gas pressurization in the BOG holding vessel and provide the pressure of unloading for it, just can not cause LNG's loss, and the natural gas evaporation gas in the rational utilization LNG holding vessel provides the pressure of unloading for the LNG tank wagon, not only need not just can improve the efficiency of unloading through the pressure boost sled of unloading, can also handle some natural gas evaporation gas.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, a natural gas storage tank evaporation and collection system comprises an LNG storage tank 1, a BOG buffer tank 2, a first collection subsystem and a second collection subsystem; the top of the LNG storage tank 1 is provided with a steam outlet, and an inlet of the BOG buffer tank 2 is communicated with the steam outlet of the LNG storage tank 1 through a pipeline; the BOG buffer tank 2 is respectively communicated with a first collecting subsystem and a second collecting subsystem by virtue of pipelines; the first collection subsystem comprises a first BOG compressor 3, a CNG compressor 4, a CNG gas column 5, a CNG tank car 6 and an outward transportation pipeline 7; an inlet of the first BOG compressor 3 is communicated with an outlet of the BOG buffer tank 2 through a pipeline, and the first BOG compressor 3, the CNG compressor 4, the CNG gas column 5 and the CNG tank wagon 6 are sequentially communicated through a pipeline; the pipelines of the first BOG compressor 3 and the CNG compressor 4 are connected with a three-way valve 8, and the first BOG compressor 3 can be communicated with an outgoing pipeline 7 by means of the three-way valve 8; the second collecting subsystem comprises a second BOG compressor 9, a BOG storage tank 10, a booster pump 11 and an LNG tank wagon 12; an inlet of the second BOG compressor 9 is communicated with the other outlet of the BOG buffer tank 2 through a pipeline, and the second BOG compressor 9, the BOG storage tank 10, the booster pump 11 and the LNG tank wagon 12 are sequentially communicated through the pipeline; the booster pump 11 can convey the natural gas boil-off gas in the BOG storage tank 10 to the LNG tanker 12 for unloading and boosting the LNG tanker 12.
The natural gas boil-off gas in the LNG storage tank 1 can enter the first collection subsystem after being introduced into the BOG buffer tank 2, so that the natural gas boil-off gas can be directly conveyed to an external conveying pipeline 7 through a three-way valve 8 after being compressed by a first BOG compressor 3, can also be conveyed to a CNG compressor 4 to be compressed into CNG and conveyed to a CNG gas column 5, and then the CNG is conveyed to a CNG tank car 6 through the CNG gas column 5, so that the natural gas boil-off gas collection mode can be increased, and the natural gas boil-off gas is conveyed to the CNG compressor 4 through the first BOG compressor 3, and in the process, the energy consumption of the first BOG compressor 3 is less than that of the first BOG compressor 3 when the natural gas boil-off gas is directly conveyed to the external conveying pipeline 7 through the first BOG compressor 3, and the pressure of the natural gas boil-off gas is not required to be compressed to the external conveying pipeline 7, so that the energy; the CNG compressor 4 compresses natural gas evaporation gas into CNG, and then the CNG is conveyed to a CNG tank car 6 through a CNG filling column 5, and the CNG can be conveyed to a nearby CNG filling station through the CNG tank car 6, and the natural gas evaporation gas is reasonably collected and utilized; the waste phenomenon can not be generated, the compressed first BOG compressor 3 can be directly conveyed to the outward conveying pipeline 7 through the three-way valve 8, and the mode is not continuously used but used when the amount of the natural gas evaporation gas required by the CNG gas column 5 is enough or the amount of the natural gas evaporation gas required by the unloading of the LNG tank car is enough.
The natural gas boil-off gas in the LNG storage tank 1 can enter the second collection subsystem after being introduced into the BOG buffer tank 2, so that the natural gas boil-off gas is compressed by the second BOG compressor 9 and is conveyed to the BOG storage tank 10, and then the natural gas boil-off gas in the BOG storage tank 10 is pressurized and conveyed to the LNG tanker 12 by the booster pump 11, so that when the LNG tanker 12 unloads LNG into the LNG storage tank 1, pressure is provided for the LNG storage tank 1, the unloading efficiency of the LNG tanker 12 is improved, and when the LNG tanker 12 unloads, the pressure of the conventional LNG tanker 12 gasifies LNG in the LNG tanker 12 by the gasifier by the unloading booster skid, the unloading pressure is provided for the LNG tanker 12, so that the loss of LNG is caused, and the transportation cost is increased; but carry the natural gas evaporation gas pressurization in the BOG holding vessel 10 to LNG tank wagon 12 and provide the pressure of unloading for it, just can not cause LNG's loss, and the natural gas evaporation gas among the rational utilization LNG holding vessel 1 provides the pressure of unloading for LNG tank wagon 12, not only need not just can improve the efficiency of unloading through the pressure boost sled of unloading, can also handle a part of natural gas evaporation gas.
The pipeline between the first BOG compressor 3 and the BOG buffer tank 2 is provided with a first control valve 13 for controlling the on-off state of the pipeline, the pipeline between the first BOG compressor 3 and the BOG buffer tank 2 can be closed by the first control valve 13, so that the natural gas evaporation gas in the BOG buffer tank 2 can only be led to the second BOG compressor 9, and the unloading pressure is provided for the LNG tank wagon 12.
And a second control valve 14 for controlling the on-off of the pipeline between the second BOG compressor 9 and the BOG buffer tank 2 is arranged on the pipeline between the second BOG compressor 9 and the BOG buffer tank 2, and the pipeline between the second BOG compressor 9 and the pipeline in the BOG buffer tank 2 can be closed by the second control valve 14, so that the natural gas evaporation gas in the BOG buffer tank 2 can only be led to the first BOG compressor 3, and sufficient natural gas is provided for the CNG tank wagon 6.
The BOG buffer tank 2 is fixedly provided with a first pressure detection indicator 15, and the first pressure detection indicator 15 can detect and indicate the pressure value of natural gas evaporation gas inside the BOG buffer tank 2, so that the natural gas evaporation gas in the BOG buffer tank 2 can be conveniently and timely conveyed to the BOG storage tank 10 or the CNG gas column 5, the pressure stability of the natural gas evaporation gas in the BOG buffer tank 2 is ensured, and the damage to the BOG buffer tank 2 caused by over-pressure is prevented; the first pressure detection indicator 15 is a pressure gauge.
The BOG storage tank 10 is fixedly provided with a second pressure detection indicator 16, the second pressure detection indicator 16 can detect and indicate the pressure of natural gas evaporation gas in the BOG storage tank 10, the second pressure detection indicator 16 is convenient for knowing the pressure in the BOG storage tank 10, so that the amount of the natural gas evaporation gas in the tank can be known, and when the amount of the natural gas evaporation gas in the BOG storage tank 10 is low, the natural gas evaporation gas can be supplemented in time through a second BOG compressor 9; the second pressure detection indicator 16 is a pressure gauge
The pressure regulating valve 17 is arranged on the pipeline connected with the outlet of the booster pump 11, so that the pressure in the pipeline connected with the outlet of the booster pump 11 can be conveniently set or observed, and the stable unloading pressure of the LNG tank wagon 12 is ensured.
The above is only the preferred embodiment of the present invention, and any person can make some simple modifications, deformations and equivalent replacements according to the present invention, all fall into the protection scope of the present invention.
Claims (6)
1. The utility model provides a natural gas liquid storage pot evaporation collecting system which characterized in that: the LNG storage tank system comprises an LNG storage tank (1), a BOG buffer tank (2), a first collection subsystem and a second collection subsystem;
the top of the LNG storage tank (1) is provided with a steam outlet, and an inlet of the BOG buffer tank (2) is communicated with the steam outlet of the LNG storage tank (1) by a pipeline; the BOG buffer tank (2) is respectively communicated with the first collecting subsystem and the second collecting subsystem by virtue of pipelines;
the first collection subsystem comprises a first BOG compressor (3), a CNG compressor (4), a CNG gas column (5), a CNG tank car (6) and an outward transportation pipeline (7); an inlet of the first BOG compressor (3) is communicated with an outlet of the BOG buffer tank (2) through a pipeline, and the first BOG compressor (3), the CNG compressor (4), the CNG gas column (5) and the CNG tank wagon (6) are sequentially communicated through a pipeline; the pipelines of the first BOG compressor (3) and the CNG compressor (4) are connected with a three-way valve (8), and the first BOG compressor (3) can be communicated with an outgoing pipeline (7) by means of the three-way valve (8);
the second collecting subsystem comprises a second BOG compressor (9), a BOG storage tank (10), a booster pump (11) and an LNG tank wagon (12); an inlet of the second BOG compressor (9) is communicated with the other outlet of the BOG buffer tank (2) through a pipeline, and the second BOG compressor (9), the BOG storage tank (10), the booster pump (11) and the LNG tank wagon (12) are sequentially communicated through the pipeline; the booster pump (11) can carry the natural gas boil-off gas in the BOG storage tank (10) to the LNG tank wagon (12) and increase the pressure for unloading the LNG tank wagon (12).
2. The evaporative collection system for a natural gas storage tank as claimed in claim 1, wherein: and a first control valve (13) for controlling the on-off of the first BOG compressor (3) is arranged on a pipeline between the first BOG compressor and the BOG buffer tank (2).
3. The evaporative collection system for a natural gas storage tank as claimed in claim 1, wherein: and a second control valve (14) for controlling the on-off of the second BOG compressor (9) is arranged on a pipeline between the second BOG compressor and the BOG buffer tank (2).
4. The evaporative collection system for a natural gas storage tank as claimed in claim 1, wherein: fixed mounting has first pressure detection indicator (15) on BOG buffer tank (2), and first pressure detection indicator (15) can detect and indicate the pressure value of the inside natural gas boil-off gas of BOG buffer tank (2).
5. The evaporative collection system for a natural gas storage tank as claimed in claim 1, wherein: fixed mounting has second pressure detection indicator (16) on BOG holding vessel (10), and second pressure detection indicator (16) can detect and instruct the pressure value of the inside natural gas boil-off of BOG holding vessel (10) jar.
6. The evaporative collection system for a natural gas storage tank as claimed in claim 1, wherein: and a pressure regulating valve (17) is arranged on a pipeline connected with the outlet of the booster pump (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921509181.5U CN210485258U (en) | 2019-09-11 | 2019-09-11 | Natural gas liquid storage pot evaporation collecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921509181.5U CN210485258U (en) | 2019-09-11 | 2019-09-11 | Natural gas liquid storage pot evaporation collecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210485258U true CN210485258U (en) | 2020-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921509181.5U Expired - Fee Related CN210485258U (en) | 2019-09-11 | 2019-09-11 | Natural gas liquid storage pot evaporation collecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210485258U (en) |
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2019
- 2019-09-11 CN CN201921509181.5U patent/CN210485258U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200508 Termination date: 20210911 |
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| CF01 | Termination of patent right due to non-payment of annual fee |