CN213394598U - Pressure reduction device that LNG removed storage tank used - Google Patents
Pressure reduction device that LNG removed storage tank used Download PDFInfo
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- CN213394598U CN213394598U CN202021985641.4U CN202021985641U CN213394598U CN 213394598 U CN213394598 U CN 213394598U CN 202021985641 U CN202021985641 U CN 202021985641U CN 213394598 U CN213394598 U CN 213394598U
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Abstract
The utility model provides a pressure reduction device for LNG movable storage and transportation tank, a traction vehicle head is connected with a bearing vehicle body, the storage and transportation tank is arranged on the bearing vehicle body, one end of the storage and transportation tank is provided with a pressure reduction device which comprises a liquefied tank and a liquid nitrogen tank, a cooling tank is arranged inside the liquid nitrogen tank, the bottom of the storage and transportation tank is communicated with the cooling tank by a flow pipe passing through the liquid nitrogen tank, a plurality of spray heads are arranged inside the liquefied tank, the cooling tank passes through the liquid nitrogen tank through a pipeline to be communicated with the plurality of spray heads inside the liquefied tank, the top of the storage and transportation tank is communicated with the liquefied tank by a pressure relief pipe, the bottom of the liquefied tank is communicated with the storage and transportation tank by a return pipe, the supercooled LNG liquid inside the liquefied tank cools the LNG gas to convert part of the LNG gas into LNG liquid, so that the gas state natural gas is cooled and condensed into liquid, thereby reducing, is suitable for popularization and application.
Description
Technical Field
The utility model belongs to the technical field of prevent that LNG warehousing and transportation step down and specifically relates to a pressure reduction means that LNG removed storage and transportation jar was used is related to.
Background
With the wide application and rapid development of domestic LNG, the technology and application of LNG gas stations are also rapidly developed. At present, due to the fact that LNG gasification capacity is relatively strong, in the process of placing or transporting, the LNG gasification process can be carried out, pressure in an LNG storage tank can be gradually increased in the process, and when the pressure exceeds a critical value, the tank body can be cracked, and LNG can be leaked or exploded. Therefore, the pressure in the LNG storage tank should be adjusted in time to eliminate potential safety hazards.
Traditional pressure reduction mode makes the relief valve open and form the natural gas and diffuses, produces a large amount of extravagant phenomena, and the lower air liquefaction that leads to of temperature of storage tank produces water and collects bottom the storage tank simultaneously, rusts easily, has reduced life.
SUMMERY OF THE UTILITY MODEL
A primary object of the utility model is to provide a pressure reduction means that LNG removed storage tank used solves the problem that a large amount of extravagant phenomena appear in the traditional mode of stepping down of LNG storage tank.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a pressure reduction device for an LNG (liquefied natural gas) mobile storage and transportation tank is characterized in that a traction vehicle head is connected with a bearing vehicle body, the storage and transportation tank is arranged on the bearing vehicle body, one end of the storage and transportation tank is provided with the pressure reduction device, the pressure reduction device comprises a liquefied tank and a liquid nitrogen tank, a cooling tank is arranged in the liquid nitrogen tank, the bottom of the storage and transportation tank penetrates through the liquid nitrogen tank through a flow pipe and is communicated with the cooling tank, a plurality of spray heads are arranged in the liquefied tank, the cooling tank penetrates through the liquid nitrogen tank through a pipeline and is communicated with the plurality of spray heads in the liquefied tank;
the bottom of the liquefaction tank is communicated with the storage tank through a return pipe.
In the preferred scheme, a second low-temperature immersed pump is arranged between the storage tank and the cooling tank, a third electric valve is arranged on one side of the second low-temperature immersed pump, and a second flowmeter is arranged on the other side of the second low-temperature immersed pump.
In a preferable scheme, a first low-temperature immersed pump is arranged on the return pipe, a first electric valve is arranged on one side of the first low-temperature immersed pump, and a first flowmeter is arranged on the other side of the first low-temperature immersed pump.
In a preferable scheme, a fourth electric valve is arranged between the cooling tank and the spray head.
In a preferable scheme, a third electric valve is arranged on the pressure relief pipe, and a one-way valve is arranged on one side of the third electric valve.
In the preferred scheme, a pressure sensor is arranged inside the storage and transportation tank.
In the preferred scheme, the liquefied petroleum gas tank and the liquid nitrogen tank are arranged on a fixed support, and the fixed support is arranged at one end of the bearing vehicle body.
The utility model provides a pressure reduction device for LNG mobile storage and transportation tank, which is arranged at the position between a traction vehicle head and the storage and transportation tank, is convenient for a driver to observe the dynamic state at any time, and the installation position is also convenient for maintenance and monitoring at any time, when the internal pressure of the storage and transportation tank is overhigh, a part of LNG liquid is conveyed into a liquid nitrogen tank for cooling, the overturning condition caused by overhigh temperature at the bottom of the storage and transportation tank is prevented, the LNG liquid capable of being cooled is conveyed into a liquefied tank, meanwhile, the LNG gas in the storage and transportation tank is decompressed into LNG liquid, at the moment, the supercooled LNG liquid in the liquefied tank cools the LNG gas to ensure that the part of the LNG gas is liquefied into LNG liquid, the gaseous natural gas is cooled and condensed into liquid, the amount of the gaseous natural gas is reduced, the pressure reduction purpose is achieved, thereby the waste caused by exhausting the gas in the storage tank in the traditional pressure reduction method is avoided, the LNG, can be recycled and is suitable for popularization and application.
Drawings
The invention will be further explained with reference to the following figures and examples:
FIG. 1 is a general installation structure diagram of the present invention;
FIG. 2 is a schematic front view of the present invention;
FIG. 3 is a view showing the structure of the pressure reducing device according to the present invention;
FIG. 4 is a structural diagram of a pressure reduction pipeline of the pressure reduction device of the present invention;
in the figure: a storage and transportation tank 1; a carrier body 2; a traction headstock 3; a pressure reducing device 4; a liquefaction tank 401; a liquid nitrogen tank 402; a first flow meter 403; a first electrically operated valve 404; a second flow meter 405; a second flow meter 405; a second electrically operated valve 406; a third electrically operated valve 407; a fourth electrically operated valve 408; a spray head 409; a cooling tank 410; a return pipe 411; a pressure relief tube 412; a fluid delivery tube 413; a first low temperature immersed pump 5; a fixed bracket 6; a pressure sensor 7; a second low temperature immersed pump 8; and a pressure gauge 9.
Detailed Description
As shown in fig. 1 to 4, a pressure reducing device for an LNG mobile storage and transportation tank, a tractor head 3 is connected with a bearing vehicle body 2, the storage and transportation tank 1 is arranged on the bearing vehicle body 2, one end of the storage and transportation tank 1 is provided with the pressure reducing device 4, the pressure reducing device 4 comprises a liquefied tank 401 and a liquid nitrogen tank 402, a cooling tank 410 is arranged in the liquid nitrogen tank 402, the bottom of the storage and transportation tank 1 penetrates through the liquid nitrogen tank 402 through a flow pipe 413 to be communicated with the cooling tank 410, a plurality of spray heads 409 are arranged in the liquefied tank 401, the cooling tank 410 penetrates through the liquid nitrogen tank 402 through a pipeline to be communicated with the plurality of spray heads 409 in the liquefied tank 401, the top of the storage and transportation tank 1 is communicated with the liquefied tank 401 through a pressure relief pipe 412. The pressure reduction device 4 is arranged at a position between the traction vehicle head 3 and the storage and transportation tank 1, so that a driver can conveniently observe the dynamic state at any time, and the installation position is convenient to maintain and monitor at any time, when the internal pressure of the storage and transportation tank 1 is too high, a part of LNG liquid is conveyed into the liquid nitrogen tank 402 to be cooled, the situation that the bottom of the storage and transportation tank 1 is turned over due to too high temperature is prevented, the LNG liquid capable of being cooled is conveyed into the liquefaction tank 401, meanwhile, the LNG gas in the storage and transportation tank 1 is decompressed into the liquefaction tank 401, at the moment, the LNG gas is cooled by the supercooled LNG liquid in the liquefaction tank 401, so that a part of the LNG gas is liquefied into the LNG liquid, and then the LNG liquid in the liquefaction tank 401 is.
In a preferable scheme, a second low-temperature immersed pump 8 is arranged between the storage tank 1 and the cooling tank 410, a second electric valve 406 is arranged on one side of the second low-temperature immersed pump 8, and a second flow meter 405 is arranged on the other side. The second cryogenic submerged pump 8 is used for conveying the LNG liquid at the bottom of the storage and transportation tank 1 to the interior of the cooling tank 410, the LNG liquid in the cooling tank 410 is effectively cooled through the liquid nitrogen tank 402, the problem of layered inversion caused by high LNG liquid conveying temperature at the bottom of the storage and transportation tank 1 is also prevented, the second electric valve 406 controls the on-off of the flow conveying pipe 413, and the second flow meter 405 is used for detecting the flow.
In a preferable scheme, a first low-temperature immersed pump 5 is arranged on the return pipe 411, a first electric valve 404 is arranged on one side of the first low-temperature immersed pump 5, and a first flow meter 403 is arranged on the other side. The first cryogenic immersed pump 5 recovers the liquid in the liquefaction tank 401 into the storage tank 1, and the liquid is measured by the first flow meter 403, and the first electric valve 404 controls the opening and closing of the return pipe 411.
Preferably, a fourth electric valve 408 is arranged between the cooling tank 410 and the spray head 409. The fourth electric valve 408 controls the on-off between the cooling tank 410 and the spray head 409.
Preferably, the pressure relief pipe 412 is provided with a third electric valve 407, and one side of the third electric valve 407 is provided with a check valve. The pressure sensor 7 detects that the pressure of the LNG in the storage and transportation tank 1 is too high, the third electric valve 407 is opened to release the pressure, the LNG gas is conveyed into the liquefaction tank 401 through the pressure release pipe 412, and the LNG gas is sprayed, cooled and condensed into liquid through the spray head 409.
In a preferable scheme, a pressure sensor 7 is arranged inside the storage and transportation tank 1. The pressure sensor 7 is used to detect the pressure inside the storage tank 1.
In a preferred scheme, the liquefaction tank 401 and the liquid nitrogen tank 402 are arranged on a fixed support 6, and the fixed support 6 is arranged at one end of the bearing vehicle body 2. The fixing bracket 6 is used to fix the liquefied tank 401 and the liquid nitrogen tank 402.
The pressure sensor 7 detects that the pressure of the LNG in the storage tank 1 is too high, the pressure in the liquefied tank 401 is lower than the pressure in the storage tank 1, the LNG gas is conveyed into the liquefied tank 401, after the pressure in the storage tank 1 returns to normal, the second electric valve 406 and the second low-temperature immersed pump 8 are opened, the LNG liquid is conveyed into the liquid nitrogen tank 402 to be cooled, the fourth electric valve 408 is opened to convey the cooled LNG liquid to the spray head 409, the spray head 409 sprays the supercooled LNG liquid, the LNG gas in the liquefied tank 401 is cooled and condensed into liquid, the second electric valve 406 and the fourth electric valve 408 are closed after the LNG liquid is condensed into liquid, the first electric valve 404 is opened, the first low-temperature immersed pump 5 is started to convey the cooled and condensed liquid in the liquefied tank 401 into the storage tank 1, meanwhile, the pressure in the liquefied tank 401 is also reduced, and the next pressure reduction treatment of the LNG is facilitated.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be considered as limitations of the present invention, and the protection scope of the present invention should be defined by the technical solutions described in the claims, and includes equivalent alternatives of technical features in the technical solutions described in the claims. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.
Claims (7)
1. The utility model provides a pressure reduction means that LNG removed storage tank used which characterized in that: the traction vehicle head (3) is connected with the bearing vehicle body (2), the storage and transportation tank (1) is arranged on the bearing vehicle body (2), one end of the storage and transportation tank (1) is provided with a pressure reducing device (4), the pressure reducing device (4) comprises a liquefied tank (401) and a liquid nitrogen tank (402), a cooling tank (410) is arranged inside the liquid nitrogen tank (402), the bottom of the storage and transportation tank (1) penetrates through the liquid nitrogen tank (402) through a flow conveying pipe (413) to be communicated with the cooling tank (410), a plurality of spray heads (409) are arranged inside the liquefied tank (401), the cooling tank (410) penetrates through the liquid nitrogen tank (402) through a pipeline to be communicated with the plurality of spray heads (409) inside the liquefied tank (401), and the top of the storage and transportation tank (1) is communicated with the liquefied tank (401) through a;
the bottom of the liquefaction tank (401) is communicated with the storage and transportation tank (1) through a return pipe (411).
2. The depressurization device for the LNG mobile storage and transport tank of claim 1, wherein: a second low-temperature immersed pump (8) is arranged between the storage and transportation tank (1) and the cooling tank (410), a second electric valve (406) is arranged on one side of the second low-temperature immersed pump (8), and a second flow meter (405) is arranged on the other side.
3. The depressurization device for the LNG mobile storage and transport tank of claim 1, wherein: the backflow pipe (411) is provided with a first low-temperature immersed pump (5), one side of the first low-temperature immersed pump (5) is provided with a first electric valve (404), and the other side of the first low-temperature immersed pump is provided with a first flowmeter (403).
4. The depressurization device for the LNG mobile storage and transport tank of claim 1, wherein: a fourth electric valve (408) is arranged between the cooling tank (410) and the spray head (409).
5. The depressurization device for the LNG mobile storage and transport tank of claim 1, wherein: the pressure relief pipe (412) is provided with a third electric valve (407), and one side of the third electric valve (407) is provided with a one-way valve.
6. The depressurization device for the LNG mobile storage and transport tank of claim 1, wherein: the pressure sensor (7) is arranged in the storage and transportation tank (1).
7. The depressurization device for the LNG mobile storage and transport tank of claim 1, wherein: the liquefaction tank (401) and the liquid nitrogen tank (402) are arranged on a fixed support (6), and the fixed support (6) is arranged at one end of the bearing vehicle body (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021985641.4U CN213394598U (en) | 2020-09-11 | 2020-09-11 | Pressure reduction device that LNG removed storage tank used |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021985641.4U CN213394598U (en) | 2020-09-11 | 2020-09-11 | Pressure reduction device that LNG removed storage tank used |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213394598U true CN213394598U (en) | 2021-06-08 |
Family
ID=76217457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021985641.4U Active CN213394598U (en) | 2020-09-11 | 2020-09-11 | Pressure reduction device that LNG removed storage tank used |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213394598U (en) |
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2020
- 2020-09-11 CN CN202021985641.4U patent/CN213394598U/en active Active
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