CN216896778U - Device for preventing LNG storage tank BOG unloading loss - Google Patents
Device for preventing LNG storage tank BOG unloading loss Download PDFInfo
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- CN216896778U CN216896778U CN202122349697.1U CN202122349697U CN216896778U CN 216896778 U CN216896778 U CN 216896778U CN 202122349697 U CN202122349697 U CN 202122349697U CN 216896778 U CN216896778 U CN 216896778U
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Abstract
The utility model discloses a device for preventing BOG (boil off gas) emptying loss of an LNG (liquefied natural gas) storage tank, which solves the technical problems that the BOG storage tank is easily damaged and even exploded due to excessive BOG in the LNG storage tank in the prior art. The device comprises a nitrogen compression expansion machine (1), a nitrogen cooler (2), a main heat exchanger (3) and a silencer (4). According to the utility model, through the supercooling of LNG and the refrigeration cycle of nitrogen compression expansion, the pressurized LNG is input into the main heat exchanger (3) to exchange heat with the nitrogen from the expansion end of the nitrogen compression expansion machine (1), and the LNG is returned to the LNG storage tank after being supercooled, so that the BOG emptying loss is reduced, the plant benefit is increased due to the reduction of the BOG loss, and the possibility of environmental pollution due to the fact that the BOG is directly put into the atmosphere is also avoided; simultaneously, utility model provides a device still has adaptability reinforce, advantages such as safe and reliable, practicality are wide.
Description
Technical Field
The utility model relates to a device for preventing BOG emptying loss, in particular to a device for preventing BOG emptying loss of an LNG storage tank.
Background
Liquefied Natural Gas (LNG) is an efficient and clean energy source, is increasingly widely used in daily life and industrial production, and also becomes one of the hotspots in the global energy market.
Since LNG has a low boiling point of-162 ℃ at normal pressure, there is a case where LNG is inevitably vaporized into natural gas during storage, loading and unloading, and gasification, and the gas vaporized from LNG is generally referred to as BOG. Due to the generation of the BOG, the internal pressure of the LNG storage tank is increased, and if the BOG in the LNG storage tank is not released in time, the structure of the storage tank can be damaged, and even the danger such as explosion can be caused; if the BOG is directly released into the atmosphere, not only can direct economic loss be caused, but also the atmospheric environment can be damaged, and with the improvement of the national requirements on environmental protection and energy conservation, the BOG emptying loss is reduced no matter under policy pressure or social responsibility, so that the BOG emptying loss is a primary task of LNG storage and transportation projects.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for preventing BOG (boil off gas) emptying loss of an LNG (liquefied natural gas) storage tank, which aims to solve the technical problems that the BOG storage tank is easily damaged and even exploded due to excessive BOG in the LNG storage tank in the prior art.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides a device for preventing BOG (boil off gas) emptying loss of an LNG (liquefied natural gas) storage tank, which comprises a nitrogen compression expander, a nitrogen cooler, a main heat exchanger and a silencer, wherein the nitrogen compression expander is connected with the main heat exchanger;
a nitrogen I-stage compression unit, a nitrogen II-stage compression unit, a nitrogen III-stage compression unit, a nitrogen expansion unit and a driving end are arranged in the nitrogen compression expander; a nitrogen I channel, a nitrogen II channel, a nitrogen III channel and a circulating water channel are arranged in the nitrogen cooler; a nitrogen precooling channel, an LNG supercooling channel and a backflow nitrogen channel are arranged in the main heat exchanger;
the inlet end of the LNG supercooling channel is also connected with an outlet pipeline of a booster pump for entering LNG, and the outlet end of the LNG supercooling channel is also connected with an inlet pipeline of an LNG storage tank for outputting LNG;
the outlet of the nitrogen backflow channel is connected with the inlet of a nitrogen I-stage compression unit, the outlet of the nitrogen I-stage compression unit is connected with the inlet of a nitrogen II-stage compression unit, the outlet of the nitrogen II-stage compression unit is connected with the inlet of a nitrogen III-stage compression unit, the outlet of the nitrogen III-stage compression unit is connected with the inlet of a nitrogen precooling channel, the outlet of the nitrogen precooling channel is connected with the inlet of a nitrogen expansion unit, and the outlet of the nitrogen expansion unit is connected with the inlet of the nitrogen backflow channel;
a nitrogen backflow pipeline is also arranged between the outlet of the nitrogen III channel and the inlet of the nitrogen precooling channel; and a nitrogen supplementing pipeline and a nitrogen discharging pipeline are also arranged between the reflux nitrogen channel and the nitrogen I-stage compression unit, and the outlet of the nitrogen discharging pipeline is connected with the silencer.
Optionally or preferably, the nitrogen iii-stage compression unit of the nitrogen compression expansion machine is arranged adjacent to the nitrogen expansion unit, and the nitrogen expansion unit applies work to the nitrogen iii-stage compression unit.
Alternatively or preferably, the driving end of the nitrogen compression-expansion machine is driven by an electric drive, a steam turbine drive or a gas.
Alternatively or preferably, the nitrogen cooler is a coiled tube heat exchanger or a plurality of shell-and-tube heat exchangers.
Optionally or preferably, the main heat exchanger is a wound tube heat exchanger or a plate-fin heat exchanger.
Optionally or preferably, a pressure detector is further arranged on the inlet pipeline of the nitrogen I-stage compression unit, a flow detector is further arranged on the outlet pipeline of the nitrogen III channel, and a temperature detector is further arranged on the outlet pipeline of the LNG supercooling channel.
Optionally or preferably, the nitrogen gas discharge pipeline is provided with a regulating valve a for discharging overpressure at the inlet of the nitrogen gas I-stage compression unit;
the nitrogen supplementing pipeline is provided with an adjusting valve b for supplementing nitrogen when the inlet pressure of the nitrogen I-stage compression unit is low;
the nitrogen return pipeline is provided with an adjusting valve c for adjusting the working condition of a compression unit of the nitrogen compression expansion machine;
an outlet pipeline of the LNG supercooling channel is provided with an adjusting valve d for adjusting the LNG supercooling temperature;
and a nozzle actuating mechanism e for controlling the opening and closing of the nozzle of the nitrogen expansion unit is arranged at the inlet of the nitrogen expansion unit.
Alternatively or preferably, the cooling medium adopted by the nitrogen cooler is circulating cooling water or air.
Based on the technical scheme, the embodiment of the utility model can at least produce the following technical effects:
(1) compared with the prior art, the device for preventing the BOG emptying loss of the LNG storage tank adopts nitrogen circulation refrigeration to supercool LNG and inject the supercooled LNG into the LNG storage tank, and does not adopt reliquefaction after BOG pressurization, so that the device is simpler in flow and easy to operate; meanwhile, the temperature of the expanded nitrogen is lower, so that the temperature of the subcooled LNG is lower, the method can be suitable for LNG with different components and different temperatures, and the energy consumption is low; in addition, the device adopts a nitrogen compression expander, not only comprises a nitrogen compression function, but also comprises a nitrogen expansion refrigeration function, the structure of the device is simpler, the investment of equipment is reduced, and the device can adapt to the working conditions of different loads.
(2) According to the device for preventing the BOG emptying loss of the LNG storage tank, provided by the utility model, the BOG gas is re-liquefied, so that the problem that the tank body is excessively damaged by the BOG gas in the LNG storage tank is avoided, explosion hazards easily caused by excessive BOG are reduced, and the problems that the transportation cost is high and the atmosphere is polluted due to direct emission of the BOG are also avoided.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: 1. a nitrogen compression expander; 2. a nitrogen gas cooler; 3. a primary heat exchanger; 4. a muffler; 5. a nitrogen make-up line; 6. a nitrogen bleed line; 7. a nitrogen return line; 8. adjusting a valve a; 9. adjusting valve b; 10. adjusting a valve d; 11. a nozzle actuator e; 12. a booster pump outlet line; 13. a booster pump outlet line; 14. adjusting valve c; a1, nitrogen I-stage compression unit; a2, nitrogen II stage compression unit; a3, nitrogen III-stage compression unit; a4, a nitrogen expansion unit; a5, a driving end; b1, a nitrogen I channel; b2 and a nitrogen II channel; b3 and a nitrogen III channel; b4, a circulating water channel; c1, a nitrogen pre-cooling channel; c2, cooling the LNG; c3, a nitrogen return channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1:
example 1
The utility model provides a device for preventing BOG (boil off gas) emptying loss of an LNG (liquefied natural gas) storage tank, which comprises a nitrogen compression expander 1, a nitrogen cooler 2, a main heat exchanger 3 and a silencer 4;
a nitrogen I-stage compression unit A1, a nitrogen II-stage compression unit A2, a nitrogen III-stage compression unit A3, a nitrogen expansion unit A4 and a driving end A5 are arranged in the nitrogen compression expansion machine 1; a nitrogen I channel B1, a nitrogen II channel B2, a nitrogen III channel B3 and a circulating water channel B4 are arranged in the nitrogen cooler 2; a nitrogen pre-cooling channel C1, an LNG (liquefied natural gas) super-cooling channel C2 and a reflux nitrogen channel C3 are arranged in the main heat exchanger 3;
the inlet end of the LNG supercooling channel C2 is also connected with a booster pump outlet pipeline 12 for entering LNG, and the outlet end of the LNG supercooling channel C2 is also connected with an LNG storage tank inlet pipeline 13 for outputting LNG;
the outlet of the nitrogen backflow channel C3 is connected with the inlet of a nitrogen I-stage compression unit A1, the outlet of the nitrogen I-stage compression unit A1 is connected with the inlet of a nitrogen I-channel B1, the outlet of the nitrogen I-channel B1 is connected with the inlet of a nitrogen II-stage compression unit A2, the outlet of the nitrogen II-stage compression unit A2 is connected with the inlet of a nitrogen II-channel B2, the outlet of the nitrogen II-channel B2 is connected with the inlet of a nitrogen III-stage compression unit A3, the outlet of the nitrogen III-stage compression unit A3 is connected with the inlet of a nitrogen III-channel B3, the outlet of the nitrogen III-channel B3 is connected with the inlet of a nitrogen precooling channel C1, the outlet of the nitrogen precooling channel C1 is connected with the inlet of a nitrogen expansion unit A4, and the outlet of the nitrogen expansion unit A4 is connected with the inlet of a nitrogen backflow channel C3;
a nitrogen backflow pipeline 7 is arranged between the outlet of the nitrogen III channel B3 and the inlet of the nitrogen precooling channel C1; a nitrogen supplementing pipeline 5 and a nitrogen discharging pipeline 6 are further arranged between the backflow nitrogen channel C3 and the nitrogen I-stage compression unit A1, and the outlet of the nitrogen discharging pipeline 6 is connected with the silencer 4.
Example 2
The utility model provides a device for preventing BOG (boil off gas) emptying loss of an LNG (liquefied natural gas) storage tank, which is compared with the embodiment 1:
as an alternative embodiment, the nitrogen gas stage iii compression unit A3 of the nitrogen gas compression expander 1 is disposed adjacent to the nitrogen gas expansion unit a4, and the nitrogen gas expansion unit a4 works the nitrogen gas stage iii compression unit A3.
As an alternative embodiment, the driving end a5 of the nitrogen compression-expansion machine 1 is driven by an electric motor and a steam turbine.
As an alternative embodiment, the nitrogen cooler 2 is a plurality of shell-and-tube heat exchangers.
As an alternative embodiment, the main heat exchanger 3 is a plate-fin heat exchanger.
As an optional embodiment, a pressure detector i is further disposed on an inlet line of the nitrogen i-stage compression unit a1, a flow detector ii is further disposed on an outlet line of the nitrogen iii channel B3, and a temperature detector iii is further disposed on an outlet line of the LNG subcooling channel C2.
As an alternative embodiment, the nitrogen discharge line 6 is provided with a regulating valve A8 for overpressure relief of the inlet of the nitrogen stage i compression unit a 1;
the nitrogen supplementing pipeline 5 is provided with a regulating valve b9 for supplementing nitrogen when the inlet pressure of the nitrogen I-stage compression unit A1 is low;
the nitrogen backflow pipeline 7 is provided with an adjusting valve c14 for adjusting the working condition of the compression unit of the nitrogen compression expansion machine 1;
an outlet pipeline of the LNG supercooling channel C2 is provided with a regulating valve d10 for regulating the LNG supercooling temperature;
the inlet of the nitrogen expansion unit A4 is provided with a nozzle actuator e11 for controlling the opening and closing of the nozzle of the nitrogen expansion unit A4.
As an alternative embodiment, the cooling medium used by the nitrogen cooler 2 is circulating cooling water.
Example 3
The utility model provides a device for preventing BOG (boil off gas) emptying loss of an LNG (liquefied natural gas) storage tank, which is compared with the embodiment 1:
as an alternative embodiment, the nitrogen gas stage iii compression unit A3 of the nitrogen gas compression expander 1 is disposed adjacent to the nitrogen gas expansion unit a4, and the nitrogen gas expansion unit a4 works the nitrogen gas stage iii compression unit A3.
As an alternative embodiment, the driving end a5 of the nitrogen compressor-expander 1 is driven by gas.
As an alternative embodiment, the nitrogen cooler 2 is a plurality of shell-and-tube heat exchangers.
As an alternative embodiment, the main heat exchanger 3 is a coiled heat exchanger.
As an optional embodiment, a pressure detector i is further disposed on an inlet line of the nitrogen i-stage compression unit a1, a flow detector ii is further disposed on an outlet line of the nitrogen iii channel B3, and a temperature detector iii is further disposed on an outlet line of the LNG subcooling channel C2.
As an alternative embodiment, the nitrogen discharge line 6 is provided with a regulating valve A8 for overpressure relief of the inlet of the nitrogen stage i compression unit a 1;
the nitrogen supplementing pipeline 5 is provided with a regulating valve b9 for supplementing nitrogen when the inlet pressure of the nitrogen I-stage compression unit A1 is low;
the nitrogen backflow pipeline 7 is provided with an adjusting valve c14 for adjusting the working condition of the compression unit of the nitrogen compression expansion machine 1;
an outlet pipeline of the LNG supercooling channel C2 is provided with a regulating valve d10 for regulating the LNG supercooling temperature;
the inlet of the nitrogen expansion unit A4 is provided with a nozzle actuator e11 for controlling the opening and closing of the nozzle of the nitrogen expansion unit A4.
As an alternative embodiment, the cooling medium used by the nitrogen cooler 2 is circulating air.
The use of the utility model comprises the following steps:
s1, allowing the LNG pressurized by an external booster pump to enter an LNG supercooling channel C2, supercooling the LNG supercooling channel C2 to minus 170 to minus 162 ℃ by the returned nitrogen, controlling the LNG temperature output by the LNG supercooling channel C2 through an adjusting valve C14, conveying the supercooled LNG to an LNG storage tank, maintaining the temperature stability of the LNG storage tank, and reducing the BOG emptying loss of the LNG storage tank;
s2, performing circulating supercooling on the LNG nitrogen, introducing normal-temperature low-pressure nitrogen flowing out from a backflow nitrogen channel C3 into a nitrogen I-stage compression unit A1 for compression, and then introducing into a nitrogen I channel B1 for cooling to 30-40 ℃; returning the nitrogen to the stage II compression section A2 of the nitrogen and compressing, and cooling the nitrogen entering a channel B2 of the nitrogen II to 30-40 ℃ by circulating water; returning to the nitrogen III-stage compression section A3 again to be compressed, and cooling the nitrogen III-stage inlet channel B3 to 30-40 ℃ by circulating water; and the nitrogen with high pressure and normal temperature enters a nitrogen precooling channel C1 to be precooled to-115 to-125 ℃, enters a nitrogen expansion unit A4 to be decompressed and expanded, is cooled to-166 to-176 ℃, enters a return nitrogen channel C3 to provide cold energy for supercooling the LNG, is discharged from the main heat exchanger 3 after the low-pressure nitrogen is reheated to the normal temperature, and then returns to the inlet of a nitrogen I-stage compression unit A1 of the nitrogen compression expander 1 to finish the nitrogen refrigeration cycle.
As an alternative embodiment, the energy for compressing the nitrogen by the nitrogen compression expander 1 is provided by the decompression expansion work of the high-pressure nitrogen in the nitrogen expansion unit a4 and the driving end a 5.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. The utility model provides a prevent device of LNG storage tank BOG unloading loss which characterized in that: comprises a nitrogen compression expander (1), a nitrogen cooler (2), a main heat exchanger (3) and a silencer (4);
a nitrogen I-stage compression unit (A1), a nitrogen II-stage compression unit (A2), a nitrogen III-stage compression unit (A3), a nitrogen expansion unit (A4) and a driving end (A5) are arranged in the nitrogen compression expansion machine (1); a nitrogen I channel (B1), a nitrogen II channel (B2), a nitrogen III channel (B3) and a circulating water channel (B4) are arranged in the nitrogen cooler (2); a nitrogen pre-cooling channel (C1), an LNG (liquefied natural gas) super-cooling channel (C2) and a reflux nitrogen channel (C3) are arranged in the main heat exchanger (3);
the inlet end of the LNG supercooling channel (C2) is further connected with a booster pump outlet pipeline (12) for entering LNG, and the outlet end of the LNG supercooling channel (C2) is further connected with an LNG storage tank inlet pipeline (13) for outputting LNG;
the outlet of the backflow nitrogen channel (C3) is connected with the inlet of a nitrogen I-stage compression unit (A1), the outlet of the nitrogen I-stage compression unit (A1) is connected with the inlet of a nitrogen I channel (B1), the outlet of the nitrogen I channel (B1) is connected with the inlet of a nitrogen II stage compression unit (A2), the outlet of the nitrogen II stage compression unit (A2) is connected with the inlet of a nitrogen II channel (B2), the outlet of the nitrogen II channel (B2) is connected with the inlet of a nitrogen III-stage compression unit (A3), the outlet of the nitrogen III-stage compression unit (A3) is connected with the inlet of a nitrogen III channel (B3), the outlet of the nitrogen III channel (B3) is connected with the inlet of a nitrogen pre-cooling channel (C1), the outlet of the nitrogen pre-cooling channel (C1) is connected with the inlet of a nitrogen expansion unit (A4), the outlet of the nitrogen expansion unit (A4) is connected with the inlet of a reflux nitrogen channel (C3);
a nitrogen return pipeline (7) is also arranged between the outlet of the nitrogen III channel (B3) and the inlet of the nitrogen precooling channel (C1); a nitrogen supplementing pipeline (5) and a nitrogen discharging pipeline (6) are further arranged between the backflow nitrogen channel (C3) and the nitrogen I-stage compression unit (A1), and the outlet of the nitrogen discharging pipeline (6) is connected with the silencer (4).
2. The device for preventing BOG emptying loss of the LNG storage tank according to claim 1, characterized in that: the nitrogen III-stage compression unit (A3) of the nitrogen compression expansion machine (1) is arranged adjacent to the nitrogen expansion unit (A4), and the nitrogen expansion unit (A4) works on the nitrogen III-stage compression unit (A3).
3. The device for preventing BOG emptying loss of the LNG storage tank according to claim 1, characterized in that: the driving end (A5) of the nitrogen compression expander (1) is driven by an electric drive, a steam turbine drive or a fuel gas drive.
4. The device for preventing BOG (boil off gas) emptying loss of the LNG storage tank as claimed in claim 1, wherein: the nitrogen cooler (2) is a wound tube type heat exchanger or a plurality of shell-and-tube type heat exchangers.
5. The device for preventing BOG (boil off gas) emptying loss of the LNG storage tank as claimed in claim 1, wherein: the main heat exchanger (3) is a wound tube type heat exchanger or a plate-fin type heat exchanger.
6. The device for preventing BOG (boil off gas) emptying loss of the LNG storage tank as claimed in claim 1, wherein: still be equipped with pressure detector (I) on the I level compression unit of nitrogen gas (A1) inlet line, still be equipped with flow detector (II) on the outlet pipeline of III passageways of nitrogen gas (B3), still be equipped with thermodetector (III) on the outlet pipeline of LNG subcooling passageway (C2).
7. The device for preventing BOG (boil off gas) emptying loss of the LNG storage tank as claimed in claim 1, wherein: the nitrogen gas discharge pipeline (6) is provided with a regulating valve a (8) for overpressure emptying of an inlet of a nitrogen gas I-stage compression unit (A1);
the nitrogen supplementing pipeline (5) is provided with a regulating valve b (9) for supplementing nitrogen when the inlet pressure of the nitrogen I-stage compression unit (A1) is low;
the nitrogen backflow pipeline (7) is provided with an adjusting valve c (14) for adjusting the working condition of a compression unit of the nitrogen compression expansion machine (1);
an outlet pipeline of the LNG supercooling channel (C2) is provided with a regulating valve d (10) for regulating the LNG supercooling temperature;
the inlet of the nitrogen expansion unit (A4) is provided with a nozzle actuator e (11) for controlling the opening and closing of the nozzle of the nitrogen expansion unit (A4).
8. The device for preventing BOG (boil off gas) emptying loss of the LNG storage tank as claimed in claim 1, wherein: the cooling medium adopted by the nitrogen cooler (2) is circulating cooling water or air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122349697.1U CN216896778U (en) | 2021-09-27 | 2021-09-27 | Device for preventing LNG storage tank BOG unloading loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122349697.1U CN216896778U (en) | 2021-09-27 | 2021-09-27 | Device for preventing LNG storage tank BOG unloading loss |
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| Publication Number | Publication Date |
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| CN216896778U true CN216896778U (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122349697.1U Active CN216896778U (en) | 2021-09-27 | 2021-09-27 | Device for preventing LNG storage tank BOG unloading loss |
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- 2021-09-27 CN CN202122349697.1U patent/CN216896778U/en active Active
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