CN208091061U - A kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas - Google Patents
A kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas Download PDFInfo
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- CN208091061U CN208091061U CN201820124251.4U CN201820124251U CN208091061U CN 208091061 U CN208091061 U CN 208091061U CN 201820124251 U CN201820124251 U CN 201820124251U CN 208091061 U CN208091061 U CN 208091061U
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- Prior art keywords
- nitrogen
- cold energy
- natural gas
- rectifying column
- oxygen
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 46
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 title claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 153
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 76
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 238000005380 natural gas recovery Methods 0.000 claims abstract description 13
- 239000003507 refrigerant Substances 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000010926 purge Methods 0.000 claims abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 7
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- 238000004887 air purification Methods 0.000 claims 1
- 238000005202 decontamination Methods 0.000 claims 1
- 230000003588 decontaminative effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- QJGQUHMNIGDVPM-BJUDXGSMSA-N Nitrogen-13 Chemical compound [13N] QJGQUHMNIGDVPM-BJUDXGSMSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004172 nitrogen cycle Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000012264 purified product Substances 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
Landscapes
- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model discloses a kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas, which includes liquified natural gas tank, cold energy of liquefied natural gas recovery system, liquid nitrogen container, purity nitrogen rectifying column, pure oxygen rectifying column, liquid oxygen tank, air cleaning system and dirty nitrogen cold energy recovery system；Pressurize after the refrigerant heat exchange of liquefied natural gas and cold energy of liquefied natural gas recovery system it is outer it is defeated for users to use, cold energy of liquefied natural gas recovery system forms refrigerant circulation circuit with purity nitrogen rectifying column；The bottom of tower of purity nitrogen rectifying column and tower top are connected to form feed back loop with the bottom of tower of pure oxygen rectifying column and tower top respectively；Air cleaning system communicates to form purging air circuit with dirty nitrogen cold energy recovery system, and dirty nitrogen cold energy recovery system forms dirty nitrogen cold energy recycling circuit with pure oxygen rectifying column.The utility model can realize that space division gas products specific energy consumption reduces by 20% or more.
Description
Technical field
The utility model is related to a kind of air-seperation systems, and in particular to a kind of cold energy using liquefied natural gas is to air
In the system that is detached of oxygen and nitrogen.
Background technology
Air separation be by air oxygen and nitrogen carry out separating-purifying storage after carry out subsequent commercial Application.It is empty
Main component in gas is oxygen and nitrogen, and the boiling point of the two is different；The technological process of air separation is first compressed air, in advance
Cold, purification is cooled further to Celsius subzero 100 more and spends, make liquid air, then utilizes the boiling-point difference of oxygen and nitrogen,
Liquid air repeatedly evaporate and condense through rectifying column, makes oxygen and nitrogen separation, liquid oxygen and the liquid nitrogen production purified
Product.
Air-seperation system needs a large amount of cryogenic cold energy, conventional liq space division generally use supercharging air cycle or nitrogen
Pressurization cycle is reconfigured two high temperature, low-temperature turbine boosting expansion machine refrigeration provides institute's chilling requirement for air separation unit.Therefore, often
The low temperature environment for advising air-seperation system is generated by the mechanical refrigeration of electric drive completely, its general power cost accounts for being produced into
This 70% or so, while also to consume a large amount of cooling water.
Air-separating technology flow using cold energy of liquefied natural gas is that cold is passed to air segregative line by refrigerant
Air cooling unit, the air rectification cell of system cancel the circulating nitrogen gas swell refrigeration unit in traditional space division technique.With tradition
Air-seperation system is compared, and the compression energy consumption for cooling of air separation unit, base can be greatly lowered using the cold of liquefied natural gas
Originally cooling water is not needed, while liquefied natural gas gasifying expense can also be reduced.Cold energy of liquefied natural gas space division technique can
The cold of LNG cold position is made full use of, energy producing level can be used high, energy-saving advantage is notable.
Currently, it is conventional using cold energy of liquefied natural gas space division technique technology for cold energy of liquefied natural gas utilization rate less than
40%, just with shallow cold part, the deep cooling part for being worth bigger does not recycle.
Utility model content
In view of this, the utility model provides a kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas, system will
Two technique units of conventional air swell refrigeration and cryogenic separation are completely separable, are independently arranged, thoroughly mutual between elimination the two
Interference, the respective technical process of re-optimization obtain largest device efficiency.
A kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas, the system include liquified natural gas tank, liquefy naturally
Gas cold energy recovery system, liquid nitrogen container, purity nitrogen rectifying column, pure oxygen rectifying column, liquid oxygen tank, air cleaning system and dirty nitrogen cold energy recycling
System；
Liquified natural gas tank leads to cold energy of liquefied natural gas recovery system, liquefied natural gas and liquefied natural gas by pipeline
Pressurize after the refrigerant heat exchange of cold energy recovery system it is outer it is defeated for users to use, cold energy of liquefied natural gas recovery system by pipeline with it is pure
Nitrogen rectifying column connects to form refrigerant circulation circuit, and purity nitrogen rectifying column is connected to by pipeline with liquid nitrogen container；The bottom of tower of purity nitrogen rectifying column
It is connected to form feed back loop with the bottom of tower of pure oxygen rectifying column and tower top respectively with tower top, pure oxygen rectifying column is connected to liquid oxygen tank simultaneously；
Air cleaning system communicates to form purging air circuit with dirty nitrogen cold energy recovery system, dirty nitrogen cold energy recovery system and pure oxygen rectifying column
It forms dirty nitrogen cold energy and recycles circuit.
Further, the cold energy of liquefied natural gas recovery system is using in low-temperature circulating working medium recycling liquified natural gas tank
The cryogenic cold energy discharged during liquid phase liquefied natural gas gasifying to room temperature (28~35 DEG C), and by the cold energy in specific operating mode
It is passed in piece-rate system from purity nitrogen rectifying tower top heat exchanger under (0.4MPa pressure).
Further, the dirty nitrogen cold energy recovery system isolates pure oxygen rectifying column tower top containing a small amount of (1~2%) liquid
After the dirty nitrogen part of oxygen is pre-chilled by dirty nitrogen cold energy recovery system to raw air, it is discharged into environment after dirty nitrogen regeneration.
Further, the pure oxygen rectifying column detaches oxygen in raw air, reaches purity requirement (99.99%)
The dirty nitrogen of liquid oxygen product and higher degree (98%~99%), liquid oxygen product enter liquid oxygen storage tank as product store, dirty nitrogen into
Enter purity nitrogen rectifying column further to detach.
Further, the purity nitrogen rectifying column further detaches the dirty nitrogen that pure oxygen rectifying column generates, and tower top generation reaches
The liquid nitrogen product of purity requirement (99.999%) enters liquid nitrogen storage tank and is stored as product.Reflux dirty nitrogen in bottom of tower is with cold energy
It returns to pure oxygen rectifying column to continue to detach, while the cold energy of liquefied natural gas is brought into inside pure oxygen rectifying column.
Further, the air cleaning system pre-processes raw air, removes impurity, makes to enter distillation system
Air material composition be nitrogen, oxygen, argon gas and other trace amount of foreign gas.
Advantageous effect：
1, the system optimization of the utility model, independent cooling strengthen low-temperature heat exchange rectifying, space division gas products unit
Energy consumption reduces by 20% or more, i.e., by our times advanced level 0.42KWh/m3(O2) it is down to 0.3KWh/m3(O2) below.
2, the operating pressure of the utility model can be developed to 1-1.2MPa from ultralow pressure 0.35MPa to high pressure；
3, liquefied natural gas normal pressure (- 162 DEG C of low temperature) gasifies in Tthe utility model system, it is ensured that whole gasification latent heats are lossless
It loses.
4, the utility model chooses best refrigeration working medium and replaces existing nitrogen cycle refrigeration system, by cold contained by LNG by-
162 DEG C are down to -196 DEG C, make liquefaction of nitrogen, it is ensured that the cold energy of liquefied natural gas rate of recovery reaches 90% or more.
5, the system of the utility model mends cold fast, short, the elastic big, flexible adjustment of startup；System cancels turbo-expander, behaviour
Make more stable reliable.
6, the utility model uses completely new low-temperature distillation process and equipment, the single rectification column fed using two-phase, it is ensured that
It detaches efficient, energy-saving；System footprint substantially reduces, and construction investment is reduced by 30% or more and (advised with same liquid production
Mould meter), system green recycles, low-carbon environment-friendly, and energy-saving effect is notable.
7, the product scheme design of the utility model is flexible, need to only adjust the technological parameter of heat exchange rectifying and can meet production
It is required that.
Description of the drawings
Fig. 1 is the system composition and fundamental diagram of the utility model.
Specific implementation mode
With reference to the accompanying drawings and examples, the utility model is described in detail.
As shown in Fig. 1, the utility model provides a kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas, this is
System includes liquified natural gas tank, cold energy of liquefied natural gas recovery system, liquid nitrogen container, purity nitrogen rectifying column, pure oxygen rectifying column, liquid oxygen
Tank, air cleaning system and dirty nitrogen cold energy recovery system；
The liquefied natural gas 1 that liquefied natural gas LNG is pressurized to specified pressure from storage tank output enters cold energy of liquefied natural gas
Cold energy is passed to gaseous coolant 4, gaseous state by recovery system, the liquefied natural gas gasifying in cold energy of liquefied natural gas recovery system
Refrigerant 4 becomes liquid refrigerants 3, storage of cold from gaseous state.Natural gas 2 after exchanging heat with refrigerant is outer defeated after pressurizeing, for natural gas
Family uses.Liquid refrigerants 3 enters purity nitrogen rectifying column, is stored in after the gaseous nitrogen of purity nitrogen rectifying column tower top is cooled to liquid nitrogen 7
In liquid nitrogen container, the oxygen-nitrogen mixture 6 at purity nitrogen rectifying tower bottom enters pure oxygen rectifying column as charging.Liquid refrigerants 3 becomes gaseous state
The cold energy of liquefied natural gas recovery system that refrigerant 4 returns to continues to store cold energy of liquefied natural gas.
Air 14 is purified by air cleaning system, and purified air 12 enters dirty nitrogen cold energy recovery system recycling
Cold from pure oxygen rectifying tower top part dirt nitrogen 9, cold air 10 after cooling enter pure oxygen rectifying column as charging.Pure oxygen
Isolate liquid oxygen LO in rectifying tower bottom2Into liquid oxygen tank, the charging of part dirt nitrogen 5 that tower top is isolated as purity nitrogen rectifying column,
Another part dirt nitrogen 9 enters air cleaning system after dirty nitrogen cold energy recovery system, and the regeneration as air cleaning system is blown
Scavenging 11 is discharged by the dirty nitrogen 13 of air cleaning system in air.
In conclusion the above is only the preferred embodiments of the present utility model only, it is not intended to limit the utility model
Protection domain.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all wrap
Containing being within the protection scope of the utility model.
Claims (6)
1. a kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas, which is characterized in that the system include liquified natural gas tank,
Cold energy of liquefied natural gas recovery system, liquid nitrogen container, purity nitrogen rectifying column, pure oxygen rectifying column, liquid oxygen tank, air cleaning system and dirty nitrogen
Cold energy recovery system；
Liquified natural gas tank leads to cold energy of liquefied natural gas recovery system, liquefied natural gas and cold energy of liquefied natural gas by pipeline
Pressurize after the refrigerant heat exchange of recovery system it is outer it is defeated for users to use, cold energy of liquefied natural gas recovery system passes through pipeline and purity nitrogen essence
It evaporates tower to connect to form refrigerant circulation circuit, purity nitrogen rectifying column is connected to by pipeline with liquid nitrogen container；The bottom of tower of purity nitrogen rectifying column and tower
Top is connected to form feed back loop with the bottom of tower of pure oxygen rectifying column and tower top respectively, and pure oxygen rectifying column is connected to liquid oxygen tank simultaneously；Air
Purification system communicates to form purging air circuit with dirty nitrogen cold energy recovery system, and dirty nitrogen cold energy recovery system is formed with pure oxygen rectifying column
Dirty nitrogen cold energy recycles circuit.
2. oxygen nitrogen piece-rate system as described in claim 1, which is characterized in that the cold energy of liquefied natural gas recovery system uses
Low-temperature circulating working medium recycles the low temperature cold that liquid phase liquefied natural gas gasifying discharges in the process to 28~35 DEG C in liquified natural gas tank
Can, and the cold energy is passed to from purity nitrogen rectifying tower top heat exchanger in piece-rate system under 0.4MPa pressure.
3. oxygen nitrogen piece-rate system as claimed in claim 1 or 2, which is characterized in that the dirt nitrogen cold energy recovery system is by pure oxygen
Rectifying column tower top isolate the dirty nitrogen part containing 1~2% liquid oxygen by dirty nitrogen cold energy recovery system to raw air be pre-chilled after,
It is discharged into environment after dirty nitrogen regeneration.
4. oxygen nitrogen piece-rate system as claimed in claim 3, which is characterized in that the pure oxygen rectifying column by oxygen in raw air into
Row separation, obtains the liquid oxygen product that purity is 99.99% and the dirty nitrogen that purity is 98%~99%, and liquid oxygen product enters liquid oxygen storage
Tank stores as product, and dirty nitrogen enters purity nitrogen rectifying column and further detaches.
5. oxygen nitrogen piece-rate system as claimed in claim 4, which is characterized in that the purity nitrogen rectifying column generates pure oxygen rectifying column
Dirty nitrogen further detach, tower top generate reach purity be 99.999% liquid nitrogen product enter liquid nitrogen storage tank as product progress
Storage；Reflux dirty nitrogen in bottom of tower returns to pure oxygen rectifying column with cold energy to be continued to detach, while the cold energy of liquefied natural gas is brought into
Inside pure oxygen rectifying column.
6. oxygen nitrogen piece-rate system as claimed in claim 5, which is characterized in that the air cleaning system carries out raw air
Decontamination processing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820124251.4U CN208091061U (en) | 2018-01-24 | 2018-01-24 | A kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820124251.4U CN208091061U (en) | 2018-01-24 | 2018-01-24 | A kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas |
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| Publication Number | Publication Date |
|---|---|
| CN208091061U true CN208091061U (en) | 2018-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108266965A (en) * | 2018-01-24 | 2018-07-10 | 北京拓首能源科技股份有限公司 | A kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108266965A (en) * | 2018-01-24 | 2018-07-10 | 北京拓首能源科技股份有限公司 | A kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas |
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