CN208567309U - A kind of air-seperation system using cold energy of liquefied natural gas - Google Patents
A kind of air-seperation system using cold energy of liquefied natural gas Download PDFInfo
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- CN208567309U CN208567309U CN201820124314.6U CN201820124314U CN208567309U CN 208567309 U CN208567309 U CN 208567309U CN 201820124314 U CN201820124314 U CN 201820124314U CN 208567309 U CN208567309 U CN 208567309U
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Abstract
The utility model discloses a kind of air-seperation system using cold energy of liquefied natural gas, which includes liquified natural gas tank, cold energy of liquefied natural gas recovery system, raw argon column, purity nitrogen rectifying column, pure oxygen rectifying column, 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 and purity nitrogen rectifying column form refrigerant circulation circuit, and the tower bottom and tower top of purity nitrogen rectifying column are connected to form feed back loop with the tower bottom of pure oxygen rectifying column and tower top respectively；Argon gas purification and liquid oxygen cooling circuit are formed between raw argon column and pure oxygen rectifying column, air cleaning system communicates to form purging air circuit with dirty nitrogen cold energy recovery system, and dirty nitrogen cold energy recovery system and pure oxygen rectifying column and raw argon column form dirty nitrogen cold energy recycling circuit.The utility model, which is able to achieve space division gas products specific energy consumption, reduces by 20% or more.
Description
Technical field
The utility model relates 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 separated of oxygen and nitrogen.
Background technique
Air separation be by air oxygen and nitrogen carry out separating-purifying storage after carry out subsequent industrial application.It is empty
Main component in gas is oxygen and nitrogen, and the boiling point of the two is different；The process flow 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 is repeatedly evaporated and condensed through rectifying column, makes oxygen and nitrogen separation, the liquid oxygen and liquid nitrogen purified produces
Product.
Air-seperation system needs a large amount of cryogenic cold energy, and conventional liq space division generallys use supercharging air circulation or nitrogen
Pressurization cycle is reconfigured two high temperature, low-temperature turbine boosting expansion machine refrigeration as air separation unit and provides institute's chilling requirement.Therefore, often
The low temperature environment for advising air-seperation system is generated by the mechanical refrigeration being driven by electricity 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 process using cold energy of liquefied natural gas is that cooling capacity is passed to air separation system 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 cooling capacity 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 cooling capacity of LNG cold position is made full use of, can be high with energy producing level, energy-saving advantage is significant.
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, being worth bigger deep cooling part, there is no recycle.
Utility model content
In view of this, the present invention provides a kind of air-seperation system using cold energy of liquefied natural gas, system will
Conventional air swell refrigeration and two technique units of 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 air-seperation system using cold energy of liquefied natural gas, the system include liquified natural gas tank, liquefy naturally
Gas cold energy recovery system, argon tank, raw argon column, liquid nitrogen container, purity nitrogen rectifying column, pure oxygen rectifying column, liquid oxygen tank, air cleaning system
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 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 tower bottom of purity nitrogen rectifying column
It is connected to form feed back loop with the tower bottom of pure oxygen rectifying column and tower top respectively with tower top；Between raw argon column and pure oxygen rectifying column
Argon gas purification and liquid oxygen cooling circuit are formed, pure oxygen rectifying column is connected to liquid oxygen tank simultaneously, and air cleaning system and dirty nitrogen cold energy return
Receipts system communicates to form purging air circuit, and dirty nitrogen cold energy recovery system and pure oxygen rectifying column and raw argon column form dirty nitrogen cold energy
Recycle 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 condition
It is passed in separation system under (0.4MPa) from purity nitrogen rectifying tower top heat exchanger.
Further, the dirty nitrogen cold energy recovery system isolates pure oxygen the top of the distillation column containing a small amount of (1~2%) liquid
After the dirty nitrogen part of oxygen passes through dirty nitrogen cold energy recovery system to raw air pre-cooling, it is discharged into environment after dirty nitrogen regeneration.
Further, the pure oxygen rectifying column separates oxygen in raw air, obtains the liquid oxygen that purity is 99.99%
The dirty nitrogen that product and purity are 98%~99%, liquid oxygen product enter liquid oxygen storage tank and store as product, and dirty nitrogen enters purity nitrogen essence
Tower is evaporated further to separate.
Further, the dirty nitrogen that the purity nitrogen rectifying column generates pure oxygen rectifying column further separates, and tower top generation reaches
The liquid nitrogen product of purity requirement (99.999%) enters liquid nitrogen storage tank and is stored as product.Tower bottom flows back dirty nitrogen with cold energy
It returns to pure oxygen rectifying column to continue to separate, 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.
Further, the liquid argon and liquid oxygen that pure oxygen rectifier bottoms contain are entered crude argon rectifying by the raw argon column
Tower, tower top isolate the liquid argon product of high-purity (92%~98%), and tower bottom high-purity (94%~96%) liquid oxygen product returns
Enter liquid oxygen storage tank after liquid oxygen rectifying column.
The utility model has the advantages that
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 cooling capacity 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 starting；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 separates efficient, energy-saving；System footprint substantially reduces, and construction investment reduces by 30% or more (with same liquid production rule
Mould meter), system green recycles, low-carbon environment-friendly, and energy-saving effect is significant.
7, the product scheme design of the utility model is flexible, and the technological parameter that need to only adjust heat exchange rectifying can meet production
It is required that.
Detailed description of the invention
Fig. 1 is the system theory of constitution figure of the utility model.
Specific embodiment
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 air-seperation system using cold energy of liquefied natural gas, this is
System include liquified natural gas tank, cold energy of liquefied natural gas recovery system, argon tank, raw argon column, liquid nitrogen container, purity nitrogen rectifying column,
Pure oxygen rectifying column, liquid oxygen tank, air cleaning system and dirty nitrogen cold energy recovery system；
Liquefied natural gas 1 enters cold energy of liquefied natural gas recovery system from storage tank output, recycles in cold energy of liquefied natural gas
Cold energy is passed to gaseous coolant 4 by liquefied natural gas gasifying in system, and gaseous coolant 4 becomes liquid 3 from gaseous state.It is changed with refrigerant
Natural gas 2 after heat is outer defeated after pressurizeing, for users to use.Liquid refrigerants 3 enters purity nitrogen rectifying column, by purity nitrogen the top of the distillation column
Gaseous nitrogen is cooled to liquid nitrogen 7, and it is that the return cold energy recovery system 1 of gaseous coolant 4 continues storage liquefaction naturally that liquid refrigerants 4, which gasifies,
Air cooling amount, liquid nitrogen 7 after cooling are stored in liquid nitrogen container.The charging of purity nitrogen rectifying column is the dirt from pure oxygen the top of the distillation column
Nitrogen 5.
Purity nitrogen rectifying column tower bottom distillate is oxygen nitrogen mixing liquid 6 as charging and enters pure oxygen rectifying column.From pure oxygen rectifying column
Charging of the oxygen argon mixture gas 12 that middle and lower part extracts as raw argon column, it is higher that raw argon column tower top isolates purity
Gas argon 14 store up into argon tank, tower bottom is that the higher oxygen argon mixture gas 13 of oxygen content is back in pure oxygen rectifying column.
Air 19 is purified by air cleaning system, and purified air 16 enters dirty nitrogen cold energy recovery system recycling
Cooling capacity from pure oxygen rectifying tower top part dirt nitrogen 10, cold air 15 after cooling enter pure oxygen rectifying column as charging.It is pure
It isolates part liquid oxygen 11 and stores up into liquid oxygen tank, cold source of another part liquid oxygen 8 as raw argon column, liquid oxygen in oxygen rectifying tower bottom
8 provide for raw argon column and become gas oxygen 9 after cooling capacity back in pure oxygen rectifying column.The part that pure oxygen the top of the distillation column generates is dirty
Charging of the nitrogen 5 as purity nitrogen rectifying column, another part dirt nitrogen 10 enter air after dirty nitrogen cold energy recovery system recycles cooling capacity
Purification system is discharged into air as the regeneration purge gas 17 of air cleaning system by the dirty nitrogen 18 of air cleaning system.
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 scope.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 air-seperation 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, argon tank, raw argon column, liquid nitrogen container, purity nitrogen rectifying column, pure oxygen rectifying column, liquid oxygen tank, sky
Gas purification 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 tower bottom and tower of purity nitrogen rectifying column
Top is connected to form feed back loop with the tower bottom of pure oxygen rectifying column and tower top respectively；It is formed between raw argon column and pure oxygen rectifying column
Argon gas purification and liquid oxygen cooling circuit, pure oxygen rectifying column are connected to liquid oxygen tank simultaneously, and air cleaning system and dirty nitrogen cold energy recycling are
System communicates to form purging air circuit, and dirty nitrogen cold energy recovery system and pure oxygen rectifying column and raw argon column form dirty nitrogen cold energy and recycle
Circuit.
2. separation system as described in claim 1, which is characterized in that the cold energy of liquefied natural gas recovery system uses low temperature
Cycle fluid recycles the cryogenic cold energy that liquid phase liquefied natural gas gasifying discharges in the process to 28~35 DEG C in liquified natural gas tank, and
The cold energy is passed in separation system under the pressure of 0.4MPa from purity nitrogen rectifying tower top heat exchanger.
3. separation system as claimed in claim 2, which is characterized in that the dirt nitrogen cold energy recovery system is by pure oxygen rectifying tower
Isolate dirty nitrogen regeneration after the dirty nitrogen part containing 1~2% liquid oxygen passes through dirty nitrogen cold energy recovery system to raw air pre-cooling in top
After be discharged into environment.
4. separation system as claimed in claim 3, which is characterized in that the pure oxygen rectifying column is divided oxygen in raw air
From obtaining the liquid oxygen product that purity is 99.99% and the dirty nitrogen that purity is 98%~99%, liquid oxygen product enters liquid oxygen storage tank work
For product storage, dirty nitrogen enters purity nitrogen rectifying column and further separates.
5. separation system as claimed in claim 4, which is characterized in that the dirt that the purity nitrogen rectifying column generates pure oxygen rectifying column
Nitrogen further separates, and the liquid nitrogen product that tower top generation reaches 99.999% purity enters liquid nitrogen storage tank and stored as product；
The dirty nitrogen of tower bottom reflux, which returns to pure oxygen rectifying column with cold energy, to be continued to separate, while the cold energy of liquefied natural gas is brought into pure oxygen essence
It evaporates inside tower.
6. separation system as claimed in claim 5, which is characterized in that the raw argon column contains pure oxygen rectifier bottoms
Liquid argon and liquid oxygen enter raw argon column, and it is 92%~98% evil liquid argon product that tower top, which isolates purity, and tower bottom purity is
94%~96% liquid oxygen product enters liquid oxygen storage tank after returning to liquid oxygen rectifying column.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240733A (en) * | 2018-01-24 | 2018-07-03 | 北京拓首能源科技股份有限公司 | A kind of air-seperation system using cold energy of liquefied natural gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240733A (en) * | 2018-01-24 | 2018-07-03 | 北京拓首能源科技股份有限公司 | A kind of air-seperation system using cold energy of liquefied natural gas |
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