CN108266965A - 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
- Publication number
- CN108266965A CN108266965A CN201810069377.0A CN201810069377A CN108266965A CN 108266965 A CN108266965 A CN 108266965A CN 201810069377 A CN201810069377 A CN 201810069377A CN 108266965 A CN108266965 A CN 108266965A
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- China
- Prior art keywords
- nitrogen
- cold energy
- natural gas
- rectifying column
- oxygen
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04636—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a hybrid air separation unit, e.g. combined process by cryogenic separation and non-cryogenic separation techniques
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04787—Heat exchange, e.g. main heat exchange line; Subcooler, external reboiler-condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/40—Air or oxygen enriched air, i.e. generally less than 30mol% of O2
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention 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 towe and tower top of purity nitrogen rectifying column connect to form feed back loop with the bottom of towe 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 present invention can realize that space division gas products specific energy consumption reduces by more than 20%.
Description
Technical field
The present invention relates to a kind of air-seperation systems, and in particular to a kind of cold energy using liquefied natural gas is in air
The system that oxygen and nitrogen are detached.
Background technology
Air separation is to carry out subsequent commercial Application after the oxygen in air and nitrogen are carried out separating-purifying storage.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 more than Celsius subzero 100 degree, makes liquid air, then using oxygen and the boiling-point difference of 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 completely by the mechanical refrigeration of electric drive, 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 to, 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 height can be used, energy-saving advantage is notable.
At present, 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.
Invention content
In view of this, the present invention provides a kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas, system will be traditional
Two technique units of air swell refrigeration and cryogenic separation are completely separable, are independently arranged, thoroughly interfering with each other between elimination the two,
The respective technical process of re-optimization obtains 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, liquefaction 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 by pipeline with liquid nitrogen container；The bottom of towe of purity nitrogen rectifying column
It connects to form feed back loop with the bottom of towe of pure oxygen rectifying column and tower top respectively with tower top, pure oxygen rectifying column connects 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
Form dirty nitrogen cold energy recycling 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.The dirty nitrogen of bottom of towe reflux is with cold energy
Pure oxygen rectifying column is returned to continue to detach, while be brought into inside pure oxygen rectifying column the cold energy of liquefied natural gas.
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：
1st, system optimization of the invention, independent cooling strengthen low-temperature heat exchange rectifying, space division gas products specific energy consumption
More than 20% is reduced, i.e., by our times advanced level 0.42KWh/m3(O2) it is down to 0.3KWh/m3(O2) below.
2nd, operating pressure of the invention can be developed to 1-1.2MPa from ultralow pressure 0.35MPa to high pressure；
3rd, liquefied natural gas normal pressure (- 162 DEG C of low temperature) gasifies in present system, it is ensured that whole gasification latent heat frees of losses.
4th, the present invention chooses the existing nitrogen cycle refrigeration system of best refrigeration working medium substitution, by cold contained by LNG by -162 DEG C
- 196 DEG C are down to, makes liquefaction of nitrogen, it is ensured that the cold energy of liquefied natural gas rate of recovery reaches more than 90%.
5th, system of the invention mends cold fast, short, the elastic big, flexible adjustment of startup；System cancels turbo-expander, and operation is more
Add stable reliable.
6th, the present invention uses completely new low-temperature distillation process and equipment, the single rectification column fed using two-phase, it is ensured that separation
Efficiently, it is energy-saving；System footprint substantially reduces, and construction investment reduces by more than 30% (with same liquid production scale
Meter), system green recycles, low-carbon environment-friendly, and energy-saving effect is notable.
7th, product scheme design of the invention is flexible, need to only adjust the technological parameter of heat exchange rectifying can meet production will
It asks.
Description of the drawings
Fig. 1 is the system composition and fundamental diagram of the present invention.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, the present invention provides a kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas, the system packets
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, sky
Gas 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, part dirt 5 charging as purity nitrogen rectifying column of nitrogen that tower top is isolated,
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 foregoing is merely a prefered embodiment of the invention, it is not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
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 by pipeline with liquid nitrogen container；The bottom of towe and tower of purity nitrogen rectifying column
Top connects to form feed back loop with the bottom of towe of pure oxygen rectifying column and tower top respectively, and pure oxygen rectifying column connects liquid oxygen tank simultaneously；Air
Cleaning 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
The low temperature cold that liquid phase liquefied natural gas gasifying discharges in the process to 28~35 DEG C in low-temperature circulating working medium recycling 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 generation reach purity be 99.999% liquid nitrogen product enter liquid nitrogen storage tank as product progress
Storage；The dirty nitrogen of bottom of towe reflux returns to pure oxygen rectifying column with cold energy to be continued to detach, while be brought into the cold energy of liquefied natural gas
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810069377.0A CN108266965A (en) | 2018-01-24 | 2018-01-24 | A kind of oxygen nitrogen piece-rate system using cold energy of liquefied natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810069377.0A CN108266965A (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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| CN108266965A true CN108266965A (en) | 2018-07-10 |
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| CN201810069377.0A Pending CN108266965A (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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108826830A (en) * | 2018-07-12 | 2018-11-16 | 北京拓首能源科技股份有限公司 | A kind of intermediate feed coke-stove gas recovery system using cold energy of liquefied natural gas |
| CN112161427A (en) * | 2020-09-29 | 2021-01-01 | 王惠敏 | Symmetrical mixed flow oxygen-nitrogen separation preparation machine |
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| CN104807289A (en) * | 2014-10-31 | 2015-07-29 | 刘继福 | Method for air separation production on liquid oxygen and liquid nitrogen through LNG (Liquefied Natural Gas) cold energy |
| US20160053764A1 (en) * | 2012-10-03 | 2016-02-25 | Ahmed F. Abdelwahab | Method for controlling the compression of an incoming feed air stream to a cryogenic air separation plant |
| CN208091061U (en) * | 2018-01-24 | 2018-11-13 | 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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2018
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Patent Citations (7)
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|---|---|---|---|---|
| JPH05187764A (en) * | 1992-01-09 | 1993-07-27 | Kobe Steel Ltd | Air separating device |
| JPH1151558A (en) * | 1997-07-28 | 1999-02-26 | Daido Hoxan Inc | Air separator |
| JP2000130926A (en) * | 1998-10-29 | 2000-05-12 | Osaka Gas Co Ltd | Integrated device for reliquefaction and air separation of lng boiloff gas |
| JP2002039674A (en) * | 2000-07-28 | 2002-02-06 | Agency Of Ind Science & Technol | Device for separating and liquefying oxygen and nitrogen from air |
| US20160053764A1 (en) * | 2012-10-03 | 2016-02-25 | Ahmed F. Abdelwahab | Method for controlling the compression of an incoming feed air stream to a cryogenic air separation plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108826830A (en) * | 2018-07-12 | 2018-11-16 | 北京拓首能源科技股份有限公司 | A kind of intermediate feed coke-stove gas recovery system using cold energy of liquefied natural gas |
| CN108826830B (en) * | 2018-07-12 | 2024-01-09 | 北京拓首能源科技股份有限公司 | Intermediate feeding coke oven gas recovery system utilizing liquefied natural gas cold energy |
| CN112161427A (en) * | 2020-09-29 | 2021-01-01 | 王惠敏 | Symmetrical mixed flow oxygen-nitrogen separation preparation machine |
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