CN207231071U - The system that helium is recycled from LNG storage tank flash steam - Google Patents
The system that helium is recycled from LNG storage tank flash steam Download PDFInfo
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- CN207231071U CN207231071U CN201721252193.5U CN201721252193U CN207231071U CN 207231071 U CN207231071 U CN 207231071U CN 201721252193 U CN201721252193 U CN 201721252193U CN 207231071 U CN207231071 U CN 207231071U
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Abstract
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, including BOG compressors, secondary heat exchanger, cold washing tower, methane rectifier column, the bottom of towe of methane rectifier column connects the 4th pipeline, the 5th pipeline, first throttle valve is provided with 4th pipeline, the 5th pipeline is connected with the top of cold washing tower.The technical solution of the utility model is simple in structure, efficiency is higher, can be very good processing LNG storage tank flash steam.
Description
Technical field
The recycling of chemical industry tail gas is the utility model is related to, is recycled more particularly to one kind from LNG storage tank flash steam
The system of helium.
Background technology
Helium because of its unique property, play the role of in defence and military and scientific research it is important, because of its -268.9 DEG C
Low boiling point, liquid helium can be used in low-temperature superconducting and relevant cryogenic refrigerating system, and in addition helium can be in medical field
It is used as superconducting electromagnet cooling in magnetic resonance imaging device, is used as heat transfer medium in nuclear power apparatus, is used as in optical fiber production
Cooling and inertia protection gas, and it is used as leak detection medium in vacuum leak hunting.
China's helium consumption figure is big, and helium low output, is substantially from foreign import, helium is primarily present in naturally
In gas, the main source that helium is helium is carried from natural gas at present.
Some boil-off gas in low temperature LNG storage tank and the gas because of the generation of submerged pump mechanical heat energy, abbreviation BOG flash distillations
Vapour (Boil Off Gas), these BOG cryogenic gases cause storage tank gas-phase space pressure rise, threaten the safety of storage tank, usually
These LNG storage tank flash steams are emptied in industrial production, cause significant wastage.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of efficiency is higher, can be very good to utilize LNG storage tank
The system that helium is recycled in the slave LNG storage tank flash steam of flash steam.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, including：
For handling the compression of LNG storage tank flash steam, the BOG compressors for being pressurized LNG storage tank flash steam；
For the secondary heat exchanger for making compressed LNG storage tank flash steam cool, pass through with the BOG compressors
One pipeline connects；
For to LNG storage tank flash steam separating treatment after cooling, making to isolate LNG storage tank flash steam helium and
The cold washing tower of one liquid phase, is connected with the secondary heat exchanger by the second pipeline；
For the first liquid phase rectifying isolated to LNG storage tank flash steam, first liquid phase separation is set to go out rich nitrogen tail gas
With the methane rectifier column of second liquid phase, it is connected with the cold washing tower by the 3rd pipeline；
The bottom of towe of methane rectifier column connects the 4th pipeline, the 5th pipeline, and first throttle valve is provided with the 4th pipeline,
So that the second liquid phase throttling in the 4th pipeline is connected into LNG, the 5th pipeline with the top of cold washing tower, so that
Second liquid phase in 5th pipeline enters cold washing tower.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, further include and be arranged at BOG compressions
BOG heat exchangers before machine, for the LNG storage tank flash steam rewarming before compression.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, the second pipeline passes through methane successively
Tower bottom reboiler, secondary heat exchanger, the three-level heat exchanger of rectifying column, LNG storage tank flash steam after cooling is in tower in the second pipeline
Cool in bottom reboiler, secondary heat exchanger, three-level heat exchanger.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, the tower top connection of cold washing tower
Helium efferent duct, helium efferent duct is successively by three-level heat exchanger, secondary heat exchanger, first-class heat exchanger, in helium efferent duct
Helium rewarming in three-level heat exchanger, secondary heat exchanger, first-class heat exchanger.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, the tower top connection of methane rectifier column
Rich nitrogen tail gas efferent duct, rich nitrogen tail gas efferent duct is successively by three-level heat exchanger, secondary heat exchanger, first-class heat exchanger, rich nitrogen tail
Rich nitrogen tail gas in the gas efferent duct rewarming in three-level heat exchanger, secondary heat exchanger, first-class heat exchanger.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, the 5th pipeline passes through LNG
Pump, secondary heat exchanger, three-level heat exchanger, the second liquid phase in the 5th pipeline cool down drop in secondary heat exchanger, three-level heat exchanger
Temperature.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, further include for providing cold
Azeotrope refrigeration system, the azeotrope cycle refrigeration system include being used for mixing successively along azeotrope flow direction
Azeotrope compressor, the gas-liquid separator of cryogen compression, the liquid phase azeotrope outlet of the gas-liquid separator pass through the 6th
Pipeline connection second throttle, the second throttle connect entering for the first azeotrope compressor by the first return line
Mouthful, the gas phase azeotrope outlet of the gas-liquid separator passes through the 3rd throttle valve of the 7th pipeline connection, and the 3rd throttle valve passes through
Second return line is connected with the first return line, so as to be throttled respectively after cooling by the second throttle, the 3rd throttle valve
Liquid phase azeotrope, gas phase azeotrope azeotrope compressor is back to after converging, the azeotrope is in azeotrope
Circulated between compressor and gas-liquid separator, the 6th pipeline passes through first-class heat exchanger, and the azeotrope in the 6th pipeline is in level-one
Cool in heat exchanger, successively by first-class heat exchanger, secondary heat exchanger, the azeotrope in the 7th pipeline exists the 7th pipeline
Cooled down in first-class heat exchanger, secondary heat exchanger, the first return line passes through first-class heat exchanger, and the mixing in the first return line is cold
Agent provides cold in first-class heat exchanger, and the second return line passes through secondary heat exchanger, the azeotrope in the second return line
Cold is provided in secondary heat exchanger.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, further include for providing cold
Nitrogen refrigeration system, the nitrogen refrigeration system includes nitrogen compressor and the 4th throttle valve, nitrogen compressor pass through the 8th
The nitrogen that pipeline is compressed to the conveying of the 4th throttle valve, nitrogen are transported to nitrogen after the throttling cooling of the 4th throttle valve by the 9th pipeline
Air compressor, by the 8th pipeline, the 9th pipeline, nitrogen circulates between nitrogen compressor and the 4th throttle valve, the 8th pipeline
Successively by First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger, the nitrogen in the 8th pipeline is changed in First Heat Exchanger, second
Hot device, the cooling of the 3rd heat exchanger, the 9th pipeline is successively by rectifying column tower top heat exchanger, the 3rd heat exchanger, the second heat exchanger, the
One heat exchanger, the nitrogen in the 9th pipeline is in rectifying column tower top heat exchanger, the 3rd heat exchanger, the second heat exchanger, First Heat Exchanger
Middle offer cold.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, including：
For handling the compression of LNG storage tank flash steam, the BOG compressors for being pressurized LNG storage tank flash steam；
For the secondary heat exchanger for making compressed LNG storage tank flash steam cool, pass through pipe with the BOG compressors
Road connects；
For to LNG storage tank flash steam separating treatment after cooling, making to isolate LNG storage tank flash steam helium and
The separator of four liquid phases, is connected with the secondary heat exchanger by pipeline；
For the liquid phase rectifying isolated to LNG storage tank flash steam, the 4th liquid phase separation is set to go out rich nitrogen tail gas and
The methane rectifier column of five liquid phases, is connected with the separator by pipeline；
The bottom of towe of methane rectifier column connects the tenth pipeline, throttle valve is provided with the tenth pipeline, so that the described tenth
The 5th liquid phase in pipeline throttles into LNG.
The technical solution of the utility model is simple in structure, efficiency is higher, can be very good processing LNG storage tank flash steam.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment one for the system that helium is recycled in the slave LNG storage tank flash steam of the utility model
Figure；
Fig. 2 is the structural representation of the embodiment two for the system that helium is recycled in the slave LNG storage tank flash steam of the utility model
Figure.
Embodiment
Embodiment one
As shown in Figure 1, the system of helium is recycled in the slave LNG storage tank flash steam of the utility model, including：
For handling the compression of LNG storage tank flash steam, the BOG compressors B3 for being pressurized LNG storage tank flash steam；
For the secondary heat exchanger E2 for making compressed LNG storage tank flash steam cool, pass through first with BOG compressors
Pipeline connects；
For to LNG storage tank flash steam separating treatment after cooling, making to isolate LNG storage tank flash steam helium and
The cold washing tower T1 of one liquid phase, is connected with secondary heat exchanger by the second pipeline；
For the first liquid phase rectifying isolated to LNG storage tank flash steam, the first liquid phase separation is set to go out rich nitrogen tail gas and
The methane rectifier column T2 of two liquid phases, is connected with cold washing tower by the 3rd pipeline；
The bottom of towe of methane rectifier column connects the 4th pipeline, the 5th pipeline, and first throttle valve is provided with the 4th pipeline, so that
Second liquid phase throttling in 4th pipeline is connected into LNG, the 5th pipeline with the top of cold washing tower, so that in the 5th pipeline
Second liquid phase enters cold washing tower.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, further include and be arranged at BOG compressions
BOG heat exchanger E4 before machine, for the LNG storage tank flash steam rewarming before compression.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, the second pipeline passes through methane successively
Tower bottom reboiler E5, secondary heat exchanger E2, the three-level heat exchanger E3 of rectifying column, LNG storage tank flash distillation after cooling in the second pipeline
Vapour cools in tower bottom reboiler E5, secondary heat exchanger, three-level heat exchanger.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, the tower top connection of cold washing tower
Helium efferent duct, helium efferent duct is successively by three-level heat exchanger, secondary heat exchanger, first-class heat exchanger E1, in helium efferent duct
Helium in three-level heat exchanger, secondary heat exchanger, first-class heat exchanger rewarming.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, the tower top connection of methane rectifier column
Rich nitrogen tail gas efferent duct, rich nitrogen tail gas efferent duct is successively by three-level heat exchanger, secondary heat exchanger, first-class heat exchanger, rich nitrogen tail
Rich nitrogen tail gas in the gas efferent duct rewarming in three-level heat exchanger, secondary heat exchanger, first-class heat exchanger.
In the slave LNG storage tank flash steam of the utility model recycle helium system, wherein, the 5th pipeline by LNG pump P1,
Secondary heat exchanger, three-level heat exchanger, the second liquid phase in the 5th pipeline cool in secondary heat exchanger, three-level heat exchanger.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, further include for providing cold
Azeotrope refrigeration system, azeotrope cycle refrigeration system include being used for azeotrope successively along azeotrope flow direction
Azeotrope compressor B1, the gas-liquid separator V1 of compression, the liquid phase azeotrope outlet of gas-liquid separator pass through the 6th pipeline
Second throttle is connected, second throttle connects the entrance of the first azeotrope compressor, gas-liquid point by the first return line
Gas phase azeotrope outlet from device pass through the 3rd throttle valve of the 7th pipeline connection, the 3rd throttle valve by the second return line and
First return line connects, so that liquid phase azeotrope, gas phase after the cooling that throttled respectively by second throttle, the 3rd throttle valve
Azeotrope is back to azeotrope compressor after converging, azeotrope follows between azeotrope compressor and gas-liquid separator
Ring, the 6th pipeline pass through first-class heat exchanger, and the azeotrope in the 6th pipeline cools in first-class heat exchanger, the 7th pipeline
Successively by first-class heat exchanger, secondary heat exchanger, the azeotrope in the 7th pipeline is cold in first-class heat exchanger, secondary heat exchanger
But, the first return line passes through first-class heat exchanger, and the azeotrope in the first return line provides cold in first-class heat exchanger,
Second return line passes through secondary heat exchanger, and the azeotrope in the second return line provides cold in secondary heat exchanger.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, further include for providing cold
Nitrogen refrigeration system, nitrogen refrigeration system include nitrogen compressor B2 and the 4th throttle valve, and nitrogen compressor passes through the 8th pipe
The nitrogen that the conveying of the 4th throttle valve of road direction is compressed, nitrogen are transported to nitrogen after the throttling cooling of the 4th throttle valve by the 9th pipeline
Compressor, by the 8th pipeline, the 9th pipeline, nitrogen circulates between nitrogen compressor and the 4th throttle valve, the 8th pipeline according to
It is secondary by First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger, the nitrogen in the 8th pipeline is in First Heat Exchanger, the second heat exchange
Device, the cooling of the 3rd heat exchanger, the 9th pipeline is successively by rectifying column tower top heat exchanger, the 3rd heat exchanger, the second heat exchanger, first
Heat exchanger, the nitrogen in the 9th pipeline is in rectifying column tower top heat exchanger, the 3rd heat exchanger, the second heat exchanger, First Heat Exchanger
Cold is provided.
Embodiment two
With reference to shown in Fig. 2, the system of recycling helium in the slave LNG storage tank flash steam of the utility model, including：
For handling the compression of LNG storage tank flash steam, the BOG compressors B3 for being pressurized LNG storage tank flash steam；
For the secondary heat exchanger E2 for making compressed LNG storage tank flash steam cool, pass through pipeline with BOG compressors
Connection；
For to LNG storage tank flash steam separating treatment after cooling, making to isolate LNG storage tank flash steam helium and
The separator V3 of four liquid phases, is connected with secondary heat exchanger by pipeline；
For the liquid phase rectifying isolated to LNG storage tank flash steam, the 4th liquid phase separation is set to go out rich nitrogen tail gas and the 5th liquid
The methane rectifier column T2 of phase, is connected with separator by pipeline；
The bottom of towe of methane rectifier column connects the tenth pipeline, throttle valve is provided with the tenth pipeline, so that in the tenth pipeline
5th liquid phase throttles into LNG.
The technical solution of the utility model is simple in structure, efficiency is higher, can be very good processing LNG storage tank flash steam.
The advantages of the technical solution of the utility model is：95% is more than to the rate of recovery of helium, obtains helium purity 99%
More than, and the rate of recovery of methane is more than 99%, and product yield is big, and purity is high, and helium is recycled in success from BOG, improves production
The economic value of product.
In the slave LNG storage tank flash steam of the utility model recycle helium system, wherein, azeotrope component for nitrogen,
Methane, ethene, propane and isopentane.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, azeotrope compressor, nitrogen
Compressor and BOG compressors can be the compressor of the forms such as reciprocating compressor, centrifugal compressor, helical-lobe compressor.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, cold washing tower can be sieve plate
Tower, packed tower, plate column.
The system that helium is recycled in the slave LNG storage tank flash steam of the utility model, wherein, whole heat exchangers all can be plate
Fin heat exchanger and wound tube heat exchanger.
LNG is the abbreviation of liquefied natural gas (liquefied natural gas).
LNG storage tank is carried out using the system that helium is recycled in the slave LNG storage tank flash steam of the embodiment one of the utility model
The embodiment of flash steam processing：
BOG from battery limit (BL) first passes through heat exchanger rewarming, then after BOG compressor boosts, into ice chest, and condensed drop
Wen Hou, into cold washing tower, tower top obtains helium product, and bottom of towe liquid-phase product enters methane rectifier column, in methane rectifier column
Bottom of towe obtains LNG product, and tower top obtains rich nitrogen product, and the system is provided by azeotrope refrigeration and nitrogen throttle refrigeration system
Cold.
Come from the BOG of battery limit (BL) after BOG heat exchanger E4 rewarmings, into BOG compressor B3, exchange heat after supercharging with BOG
Device exchanges heat into secondary heat exchanger E2, the tower bottom reboiler E5 of methane rectifier column, secondary heat exchanger E2, three-level heat exchanger E3, last
Into cold washing tower T1 bottom of towe, tower top obtains helium through three-level heat exchanger E3, secondary heat exchanger E2, first-class heat exchanger E1 rewarmings
Helium product is obtained afterwards, and the liquid phase material of cold washing tower bottom of towe enters methane rectifier column T2.Obtained in methane rectifier column tower top
Rich nitrogen tail gas after three-level heat exchanger E3, secondary heat exchanger E2, first-class heat exchanger E1 rewarmings after go out system.In methane rectifier column tower
The liquid phase material that bottom obtains is divided into two strands, and LNG product is obtained after throttle valve throttles after stock-traders' know-how secondary heat exchanger E2 coolings,
After entering secondary heat exchanger E2 and three-level heat exchanger E3 coolings after other stock-traders' know-how LNG pump P1 superchargings, cold washing tower is sprayed into
Top.Nitrogen enters nitrogen compressor B2, and first-class heat exchanger E1, secondary heat exchanger E2, three-level heat exchanger E3, warp are entered after supercharging
Enter methane rectifier column tower top heat exchanger E6 after throttle valve throttling cooling, then through three-level heat exchanger E3, secondary heat exchanger E2, one
Nitrogen BOG compressors are again introduced into after level heat exchanger E1 rewarmings.
Azeotrope enters azeotrope compressor B1 after gas-liquid separator V1 separation, and liquid phase enters first-class heat exchanger E1
Enter first-class heat exchanger through throttle valve throttling, gas phase enters first-class heat exchanger E1, secondary heat exchanger E2 after the throttle throttling, returns
Secondary heat exchanger E2 is returned, first-class heat exchanger E1 is returned after converging with the cryogen after throttling, pressure is returned after providing cold for heat exchanger
Contracting machine entrance, completes the cyclic process of cryogen system.
LNG storage tank is carried out using the system that helium is recycled in the slave LNG storage tank flash steam of the embodiment two of the utility model
The embodiment of flash steam processing：
With the workflow of embodiment one difference lies in：When unstripped gas goes out three-level heat exchanger, into separator V3, gas phase
Helium product is obtained after heat exchanger rewarming, liquid phase enters methane rectifier column, and methane rectifier column materials at bottom of tower fully enters
Secondary heat exchanger E2, obtains LNG product after the throttle throttling, eliminates the related work of LNG pump and cold washing tower.
It the above is only the preferred embodiment of the utility model, it is noted that for the ordinary skill people of the art
For member, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as the scope of protection of the utility model.
Claims (9)
1. the system of helium is recycled in a kind of flash steam from LNG storage tank, it is characterised in that including：
For handling the compression of LNG storage tank flash steam, the BOG compressors for being pressurized LNG storage tank flash steam；
For the secondary heat exchanger for making compressed LNG storage tank flash steam cool, pass through the first pipe with the BOG compressors
Road connects；
For to LNG storage tank flash steam separating treatment after cooling, making to isolate helium and the first liquid to LNG storage tank flash steam
The cold washing tower of phase, is connected with the secondary heat exchanger by the second pipeline；
For the first liquid phase rectifying isolated to LNG storage tank flash steam, first liquid phase separation is set to go out rich nitrogen tail gas and
The methane rectifier column of two liquid phases, is connected with the cold washing tower by the 3rd pipeline；
The bottom of towe of methane rectifier column connects the 4th pipeline, the 5th pipeline, and first throttle valve is provided with the 4th pipeline, so that
Second liquid phase in 4th pipeline throttles into LNG, and the 5th pipeline is connected with the top of cold washing tower, so that described
Second liquid phase in 5th pipeline enters cold washing tower.
2. the system of helium is recycled from LNG storage tank flash steam as claimed in claim 1, it is characterised in that further include setting
BOG heat exchangers before BOG compressors, for the LNG storage tank flash steam rewarming before compression.
3. as claimed in claim 2 from LNG storage tank flash steam recycle helium system, it is characterised in that the second pipeline according to
It is secondary by the tower bottom reboiler of methane rectifier column, secondary heat exchanger, three-level heat exchanger, LNG storage tank after cooling in the second pipeline
Flash steam cools in tower bottom reboiler, secondary heat exchanger, three-level heat exchanger.
4. the system of helium is recycled from LNG storage tank flash steam as claimed in claim 3, it is characterised in that cold washing tower
Tower top connection helium efferent duct, helium efferent duct successively by three-level heat exchanger, secondary heat exchanger, first-class heat exchanger, helium
Helium in the efferent duct rewarming in three-level heat exchanger, secondary heat exchanger, first-class heat exchanger.
5. the system of helium is recycled from LNG storage tank flash steam as claimed in claim 4, it is characterised in that methane rectifier column
The rich nitrogen tail gas efferent duct of tower top connection, rich nitrogen tail gas efferent duct is successively by three-level heat exchanger, secondary heat exchanger, level-one heat exchange
Device, rich nitrogen tail gas in the rich nitrogen tail gas efferent duct rewarming in three-level heat exchanger, secondary heat exchanger, first-class heat exchanger.
6. the system of helium is recycled from LNG storage tank flash steam as claimed in claim 5, it is characterised in that the 5th pipe
Road is by LNG pump, secondary heat exchanger, three-level heat exchanger, and the second liquid phase in the 5th pipeline is in secondary heat exchanger, three-level heat exchanger
In cool.
7. the system of helium is recycled from LNG storage tank flash steam as claimed in claim 6, it is characterised in that further include and be used for
The azeotrope refrigeration system of cold is provided, the azeotrope refrigeration system includes being used for successively along azeotrope flow direction
Azeotrope compressor, gas-liquid separator to azeotrope compression, the liquid phase azeotrope outlet of the gas-liquid separator are logical
The 6th pipeline connection second throttle is crossed, the second throttle connects the first azeotrope compressor by the first return line
Entrance, the gas-liquid separator gas phase azeotrope outlet passes through the 3rd throttle valve of the 7th pipeline connection, the 3rd throttle valve
Connected by the second return line with the first return line, so as to be throttled respectively drop by the second throttle, the 3rd throttle valve
Liquid phase azeotrope, gas phase azeotrope after temperature are back to azeotrope compressor after converging, the azeotrope is mixing
Circulated between refrigerant compressor and gas-liquid separator, the 6th pipeline passes through first-class heat exchanger, and the azeotrope in the 6th pipeline exists
Cool in first-class heat exchanger, for the 7th pipeline successively by first-class heat exchanger, secondary heat exchanger, the mixing in the 7th pipeline is cold
Agent cools down in first-class heat exchanger, secondary heat exchanger, and the first return line passes through first-class heat exchanger, mixed in the first return line
Close cryogen and cold is provided in first-class heat exchanger, the second return line passes through secondary heat exchanger, the mixing in the second return line
Cryogen provides cold in secondary heat exchanger.
8. the system of helium is recycled from LNG storage tank flash steam as claimed in claim 7, it is characterised in that further include and be used for
The nitrogen refrigeration system of cold is provided, the nitrogen refrigeration system includes nitrogen compressor and the 4th throttle valve, nitrogen compression
The nitrogen that machine is compressed by the 8th pipeline to the conveying of the 4th throttle valve, nitrogen are passed through the 9th after the throttling cooling of the 4th throttle valve
Pipeline transports to nitrogen compressor, and by the 8th pipeline, the 9th pipeline, nitrogen follows between nitrogen compressor and the 4th throttle valve
Ring, successively by First Heat Exchanger, the second heat exchanger, the 3rd heat exchanger, the nitrogen in the 8th pipeline changes the 8th pipeline first
Hot device, the second heat exchanger, the cooling of the 3rd heat exchanger, the 9th pipeline is successively by rectifying column tower top heat exchanger, the 3rd heat exchanger, the
Two heat exchangers, First Heat Exchanger, nitrogen in the 9th pipeline rectifying column tower top heat exchanger, the 3rd heat exchanger, the second heat exchanger,
Cold is provided in First Heat Exchanger.
9. the system of helium is recycled in a kind of flash steam from LNG storage tank, it is characterised in that including：
For handling the compression of LNG storage tank flash steam, the BOG compressors for being pressurized LNG storage tank flash steam；
For the secondary heat exchanger for making compressed LNG storage tank flash steam cool, connected with the BOG compressors by pipeline
Connect；
For to LNG storage tank flash steam separating treatment after cooling, making to isolate helium and the 4th liquid to LNG storage tank flash steam
The separator of phase, is connected with the secondary heat exchanger by pipeline；
For the liquid phase rectifying isolated to LNG storage tank flash steam, the 4th liquid phase separation is set to go out rich nitrogen tail gas and the 5th liquid
The methane rectifier column of phase, is connected with the separator by pipeline；
The bottom of towe of methane rectifier column connects the tenth pipeline, throttle valve is provided with the tenth pipeline, so that the tenth pipeline
In the throttling of the 5th liquid phase into LNG.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721252193.5U CN207231071U (en) | 2017-09-27 | 2017-09-27 | The system that helium is recycled from LNG storage tank flash steam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721252193.5U CN207231071U (en) | 2017-09-27 | 2017-09-27 | The system that helium is recycled from LNG storage tank flash steam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749159A (en) * | 2019-10-22 | 2020-02-04 | 中海石油气电集团有限责任公司 | Device and method for refrigerating and liquefying natural gas |
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2017
- 2017-09-27 CN CN201721252193.5U patent/CN207231071U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749159A (en) * | 2019-10-22 | 2020-02-04 | 中海石油气电集团有限责任公司 | Device and method for refrigerating and liquefying natural gas |
| CN110749159B (en) * | 2019-10-22 | 2021-05-11 | 中海石油气电集团有限责任公司 | Device and method for refrigerating and liquefying natural gas |
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