CN207751222U - A kind of LNG cold energy uses are thermally integrated rectifying space division system - Google Patents
A kind of LNG cold energy uses are thermally integrated rectifying space division system Download PDFInfo
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- CN207751222U CN207751222U CN201820022052.2U CN201820022052U CN207751222U CN 207751222 U CN207751222 U CN 207751222U CN 201820022052 U CN201820022052 U CN 201820022052U CN 207751222 U CN207751222 U CN 207751222U
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Abstract
It is thermally integrated rectifying space division system the utility model discloses a kind of LNG cold energy uses, raw material low-pressure air is cooled down using LNG cold energy, and carry out air separation using rectifying column is thermally integrated, compared to traditional space division system, the pressure of raw air can be dropped to 0.4MPa by the utility model using heat-integrated distillation system by 0.6MPa, overall pressure tatio is reduced, air compressor machine wasted work is reduced；Raw air is cooled down using LNG, may make air compressor machine wasted work to further decrease, liquid oxygen yield is improved, to reduce unit liquid product energy consumption；The available energy loss of high-pressure tower rectifying and lower pressure column stripping process can be reduced by being thermally integrated rectifying also, improve the separation purity of oxygen nitrogen；In addition, cooling down raw air using LNG, space division system can be greatly lowered and start the time.
Description
Technical field
The utility model belongs to air separation field, is related to one kind and being thermally integrated rectifying space division system more particularly to a kind of LNG
Cold energy use is thermally integrated rectifying space division system.
Background technology
Air-seperation system all has critically important work in steel, chemical industry, semiconductor, food processing and medical field
With.Cryogenic rectification space division system is the major programme for realizing extensive high-purity nitrogen, oxygen and argon gas.Cryogenic rectification
Space division system needs to consume big energy, in the product process for especially producing liquid oxygen and liquid nitrogen.Liquefied natural gas (LNG) is to adopt
Low temperature (about 111K) mixing liquid for being obtained natural gas liquefaction with cryogenic technology, main component are methane (CH4), there is combustion
Heat the advantages such as value is high, emission pollution is small, carrying cost is low.LNG cold energy not only enormous amount, but also energy product rank height, often
The utilization seen includes mainly the direct generation of electricity, air liquefaction separation, produces liquefy dry ice, deep cooling crush and low-temperature cold store etc..It examines
The technological temperature for considering space division system is about 78~100K, lower than the temperature of LNG, can avoid the feelings of " cryogenic cold energy high temperature use "
Condition, meet " temperature counterpart, cascade utilization " energy efficiently utilizes principle, therefore this cold energy use scheme is also considered as at present
Technical Land use systems the most rational.
The energy-saving effect of existing LNG cold energy uses air-seperation system can mainly be classified as two kinds of factors：(1)LNG
Cold energy cooling air compressor or nitrogen compressor import Temperature of Working may make demand of the space division system to electric power energy consumption to reduce；(2)LNG
Cold energy can replace the reduction released cold and realize raw air temperature into liquid oxygen/liquid nitrogen of main heat exchanger high-purity, reduce volume
The outer electric power energy consumption produced needed for cryogenic liquid product cold.It is calculated by pertinent literature and patent, with conventional space division system
It compares, the energy consumption of unit liquid product is produced using the space division system of LNG cold energy can reduce by 50% or so.
However, its rectifying column operating pressure of the space division system scheme of existing LNG cold energy uses is all close to 0.6MPa, cold energy
Addition only reduce production fluid product energy consumption and to the space division system work of separation without any beneficial effect.Generate this phenomenon
Mainly there are 2 reasons：(1) its rectification cell of traditional space division system all uses double rectification column, passes through low-pressure liquid oxygen and elevated pressure nitrogen
Shang Ta and lower tower reflux gas-liquid are realized in gas heat exchange, since the boiling point of nitrogen under same pressure is far below oxygen boiling point, lower essence
Tower is evaporated to need in high-voltage operation；(2) operating temperature of double rectification column is 78~100K, and the storage temperature of LNG is 112K, if
LNG cold energy acts on distillation process, it is still necessary to is pressurized to raw air, lower work temperature is generated by expanding or throttling
Degree.The method for adjusting above-mentioned two reason only has by changing traditional cold and hot coupled modes of twin-stage rectifying, reduces rectifying column pressure
Part LNG cold energy is switched to the work of separation by power, realizes that the space division system energy consumption of LNG cold energy uses further decreases.
Utility model content
In view of the shortcomings of the prior art and insufficient, the utility model is intended to provide a kind of being thermally integrated for LNG cold energy uses
Rectifying space division system cools down raw material low-pressure air using LNG cold energy, and carries out air separation using rectifying column is thermally integrated, and compares
In traditional space division system, the utility model can be dropped to the pressure of raw air by 0.6MPa using heat-integrated distillation system
0.4MPa reduces overall pressure tatio, reduces air compressor machine wasted work；Raw air is cooled down using LNG, may make air compressor machine wasted work into one
Step reduces, and liquid oxygen yield is improved, to reduce unit liquid product energy consumption；High-pressure tower essence can be reduced by being thermally integrated rectifying also
The available energy loss with lower pressure column stripping process is evaporated, the separation purity of oxygen nitrogen is improved；In addition, raw air is cooled down using LNG, it can be with
Space division system is greatly lowered and starts the time.
The utility model is that technical solution used by solving its technical problem is：
A kind of LNG cold energy uses are thermally integrated rectifying space division system, including fan, water-cooling tower, molecular sieve, forecooler,
Air compressor machine, subcooler I, high-pressure tower, is thermally integrated unit, lower pressure column, subcooler II, LNG storage devices, cryogenic pump at main heat exchanger,
It is characterized in that,
The forecooler includes air flue and natural gas path；
The main heat exchanger includes air flue, LNG accesses, nitrogen access and dirty nitrogen access；
The subcooler I includes air flue, dirty nitrogen access and nitrogen access；
Interlaced arrangement has column plate to the high-pressure tower in the height direction, and bottom is equipped with Cryogenic air import and liquid air goes out
Mouthful, top is exported equipped with liquid nitrogen；
Interlaced arrangement has column plate, bottom to be exported equipped with liquid oxygen to the lower pressure column in the height direction, and it is empty that top is equipped with liquid
Gas import, liquid nitrogen import, pure nitrogen gas outlet and dirty nitrogen outlet；
The subcooler II includes liquid air access, nitrogen access, dirty nitrogen access and liquid nitrogen access,
Wherein,
The outlet of LNG storage devices LNG accesses and precooling through cryogenic pump, main heat exchanger successively by pipeline
The natural gas path inlet communication of device；
The air inlet of the fan machine is connected to outside air, and the gas outlet of the fan is by pipeline successively through the water
Air flue and the high-pressure tower of cold tower, molecular sieve, the air flue of forecooler, the air flue of main heat exchanger, subcooler I
The air intlet of bottom is connected to；
The liquid air outlet of the high pressure tower bottom passes through liquid air access and institute of the pipeline through the subcooler II
The liquid air inlet communication of lower pressure column top setting is stated, the liquid nitrogen outlet at the top of the high-pressure tower is by pipeline through the supercooling
The liquid nitrogen inlet communication of the liquid nitrogen access of device II and the setting of lower pressure column top；
The rectifying section of the high-pressure tower and the stripping section of lower pressure column are located at sustained height, direct contact heat transfer between the two or
It is exchanged heat by heat exchanger；
The pure nitrogen gas outlet on the lower pressure column top passes through pipeline successively nitrogen access, subcooler through the subcooler II
The entrance connection of I nitrogen access I, the nitrogen access of main heat exchanger,
The dirt that the dirty nitrogen outlet on the lower pressure column top passes through pipeline successively dirty nitrogen access, subcooler I through subcooler II
Nitrogen access, main heat exchanger dirty nitrogen access entrance connection.
Preferably, the natural gas path outlet of the forecooler is connected to by pipeline with natural gas storage or using device.
Further, between the rectifying section of the high-pressure tower and the stripping section of lower pressure column setting by it is multiple be arranged in juxtaposition change
The heat of the heat exchange integrated unit of hot device composition, the high-pressure tower rectifying section is carried by the integrated unit that exchanges heat to the lower pressure column
Evaporate section transmission.
Further, the stripping section of the lower pressure column is nested in the rectifying section of the high-pressure tower, the high-pressure tower rectifying
The heat of section is directly transmitted to the lower pressure column stripping section.
Preferably, the liquid oxygen outlet of the low pressure tower bottom is stored with liquid oxygen by pipeline or is connected using the entrance of device
It is logical.
Preferably, the outlet of the nitrogen access of the main heat exchanger is stored with nitrogen or is connected to using the entrance of device.
Preferably, the outlet of the dirty nitrogen access of the main heat exchanger is connected to the air cooling system of the molecular sieve.
Preferably, the liquid air entrance, liquid nitrogen entrance on the lower pressure column top are both provided with control valve.
Preferably, the outlet pressure of the air compressor machine is 0.4MPa or so.
Preferably, it is cooled to close to bubble point through the forecooler, main heat exchanger and subcooler I successively air after cooling
Temperature is sent into the bottom of the high-pressure tower.
The LNG cold energy uses of the utility model are thermally integrated rectifying space division system, mainly cool down raw material using LNG cold energy
Pressure-air, and air separation is carried out using rectifying column is thermally integrated, specific work process is：
Air is boosted by fan and passes through water-cooling tower cooling first, and institute's adherence pressure is for making up molecular sieve moisture removal and two
The pressure loss when impurity such as carbonoxide, the air after molecular sieve cleans enter forecooler and absorb part cold energy with LNG heat exchange,
Continue to be pressurized to .MPa in air compressor machine, the outlet air temperature of air compressor machine is close to environment temperature at this time；Air with pressure enters master and changes
Hot device, subcooler I are cooled to the bottom that high-pressure tower is sent into close to bubble point temperature by LNG and the nitrogen that backflows with dirty nitrogen, in high-pressure tower
Interior, the air of rising and reflux liquid nitrogen are in column plate condensation evaporation repeatedly so that the higher oxygen enriched liquid air of oxygen concentration is in height
Tower bottom is pressed to concentrate, high-purity liquid nitrogen is concentrated at the top of high-pressure tower；The liquid nitrogen of high-pressure tower top and bottom extraction and oxygen enriched liquid are empty
Gas participates in distillation process after subcooler II, into lower pressure column；The heat of high-pressure tower rectifying section to lower pressure column stripping section by by
The heat exchange integrated unit of multiple heat exchanger compositions being arranged in juxtaposition carries out heat transfer, promotes each column plate of high-pressure tower to generate more
Condensed fluid, each column plate of lower pressure column generate more boil-off gas；The liquid oxygen of low pressure tower bottom is directly as output of products (storage
In liquid oxygen storage device), the pure nitrogen gas at top is defeated as nitrogen product after subcooler II, subcooler I, main heat exchanger rewarming
Go out, dirty nitrogen is sent after subcooler II, subcooler I, main heat exchanger rewarming to the air cooling system of molecular sieve.
Traditional space division system compared to the prior art, the utility model LNG cold energy uses are thermally integrated rectifying space division
The pressure of raw air can be dropped to 0.4MPa by 0.6MPa using heat-integrated distillation system, reduce overall pressure tatio by system, be reduced
Air compressor machine wasted work；Raw air is cooled down using LNG, air compressor machine wasted work may make to further decrease, liquid oxygen yield is improved,
To reduce unit liquid product energy consumption；The exergy destruction of high-pressure tower rectifying and lower pressure column stripping process can be reduced by being thermally integrated rectifying
It loses, improves the separation purity of oxygen nitrogen.In addition, the utility model cools down raw air using LNG, space division can also be greatly lowered
System start-up time.
Description of the drawings
Fig. 1 is that the LNG cold energy uses of the utility model are thermally integrated rectifying space division system schematic diagram；
Fig. 2 is the bushing type rectifier unit employed in embodiment 2.
Specific implementation mode
To make the purpose of this utility model, technical solution and advantage be more clearly understood, develop simultaneously implementation referring to the drawings
The utility model is further described in example.It should be noted that as described below is only the preferable implementation of the utility model
Therefore example does not limit the scope of protection of the utility model.
Embodiment 1
As shown in Figure 1, the LNG cold energy uses of the utility model are thermally integrated rectifying space division system, including fan 1, water
Cold tower 2, forecooler 4, air compressor machine 5, main heat exchanger 6, subcooler I 7, high-pressure tower 8, is thermally integrated unit 9, lower pressure column at molecular sieve 3
10, subcooler II 11, liquid oxygen store or utilize device 12, LNG storage devices 13, cryogenic pump 14.Wherein, forecooler 4 includes sky
Gas access and natural gas path；Main heat exchanger 6 includes air flue, LNG accesses, nitrogen access and dirty nitrogen access；Subcooler I 7
Including air flue, dirty nitrogen access and nitrogen access；Interlaced arrangement has column plate, bottom to be equipped with low to high-pressure tower 8 in the height direction
Warm air import and liquid air outlet, top are exported equipped with liquid nitrogen；Interlaced arrangement has column plate to lower pressure column 10 in the height direction,
Bottom is exported equipped with liquid oxygen, and top is equipped with liquid air import, liquid nitrogen import, pure nitrogen gas outlet and dirty nitrogen outlet；Subcooler II
11 include liquid air access, nitrogen access, dirty nitrogen access and liquid nitrogen access.
The outlet of LNG storage devices 13 is by pipeline successively through cryogenic pump 14, the LNG accesses of main heat exchanger 6 and forecooler 4
Natural gas path inlet communication, the natural gas path outlet of forecooler 4 by pipeline and natural gas storage or utilizes device (figure
In be not shown) connection.The air inlet of fan machine 1 is connected to outside air, and the gas outlet of fan 1 passes through pipeline successively water cooled tower
2, molecular sieve 3, the air flue of forecooler 4,8 bottom of the air flue of main heat exchanger 6, the air flue of subcooler I 7 and high-pressure tower
The air intlet in portion is connected to；The liquid air outlet of 8 bottom of high-pressure tower passes through liquid air access of the pipeline through subcooler II 11
Liquid nitrogen outlet with the liquid air inlet communication of 10 top of lower pressure column setting, 8 top of high-pressure tower passes through pipeline through subcooler II
The liquid nitrogen inlet communication of 11 liquid nitrogen access and the setting of 10 top of lower pressure column；The stripping of the rectifying section and lower pressure column 10 of high-pressure tower 8
Section is located at sustained height, and the heat exchange integrated unit 9 being made of multiple heat exchangers being arranged in juxtaposition, high-pressure tower 8 are arranged therebetween
The heat of rectifying section is transmitted by the integrated unit 9 that exchanges heat to 10 stripping section of lower pressure column；The liquid oxygen outlet of 10 bottom of lower pressure column is logical
Pipeline is crossed to be connected to the entrance of liquid oxygen storage device 12；The pure nitrogen gas outlet on 10 top of lower pressure column is by pipeline successively through subcooler
II 11 nitrogen access, the nitrogen access I of subcooler I 7, the nitrogen access of main heat exchanger 6 and nitrogen storage utilize device (figure
In be not shown) entrance connection, 10 top of lower pressure column dirty nitrogen outlet by pipeline successively the dirty nitrogen access through subcooler II 11,
The dirty nitrogen access of subcooler I 7, the dirty nitrogen access of main heat exchanger 6 are connected to the air cooling system of molecular sieve 3.
The LNG cold energy uses of the utility model are thermally integrated rectifying space division system, mainly cool down raw material using LNG cold energy
Pressure-air, and air separation is carried out using rectifying column is thermally integrated, specific work process is：
Air is boosted by fan 1 and is cooled down by water-cooling tower 3 first, and institute's adherence pressure is for making up 3 moisture removal of molecular sieve
With the pressure loss when impurity such as carbon dioxide, the air after the removal of impurities of molecular sieve 3 enters forecooler 4 and LNG heat exchange and absorbs part
Cold energy continues to be pressurized to 0.4MPa in air compressor machine 5, and the outlet air temperature of air compressor machine 5 is close to environment temperature at this time；Sky with pressure
Gas enters main heat exchanger 6, subcooler I 7 is cooled to close to bubble point temperature with dirty nitrogen by LNG and the nitrogen that backflows and is sent into high-pressure tower 8
Bottom, in high-pressure tower 8, the air of rising and reflux liquid nitrogen are in column plate condensation evaporation repeatedly so that the higher richness of oxygen concentration
Oxygen liquid air is concentrated in 8 bottom of high-pressure tower, and high-purity liquid nitrogen is concentrated at 8 top of high-pressure tower；The extraction of 8 top and bottom of high-pressure tower
After subcooler II 11, distillation process is participated in into lower pressure column 10 with oxygen enriched liquid air for liquid nitrogen；The heat of 8 rectifying section of high-pressure tower
Heat transfer is carried out by the heat exchange integrated unit 9 being made of multiple heat exchangers being arranged in juxtaposition to 10 stripping section of lower pressure column, is promoted
More condensed fluids are generated into 8 each column plate of high-pressure tower, 10 each column plate of lower pressure column generates more boil-off gas；10 bottom of lower pressure column
The liquid oxygen in portion (is stored in liquid oxygen storage device 12) directly as output of products, and the pure nitrogen gas at top is through subcooler II 11, mistake
It is exported as nitrogen product after cooler I 7,6 rewarming of main heat exchanger, dirty nitrogen is multiple through subcooler II 11, subcooler I 7, main heat exchanger 6
It is sent after temperature to the air cooling system of molecular sieve 3.
Embodiment 2
With embodiment 1 the difference is that, as shown in Fig. 2, the high-pressure tower 8 and lower pressure column 10 in embodiment 2 are integrated in
Be formed as bushing type rectifier unit together, the stripping section of lower pressure column 10 is nested in the rectifying section of high-pressure tower 8, therebetween directly
Heat exchange.In addition to this, the connection relation in embodiment 2 between other each components is consistent with embodiment 1.
Traditional space division system compared to the prior art, the utility model LNG cold energy uses are thermally integrated rectifying space division
The pressure of raw air can be dropped to 0.4MPa by 0.6MPa using heat-integrated distillation system, reduce overall pressure tatio by system, be reduced
Air compressor machine wasted work；Raw air is cooled down using LNG, air compressor machine wasted work may make to further decrease, liquid oxygen yield is improved,
To reduce unit liquid product energy consumption；The exergy destruction of high-pressure tower rectifying and lower pressure column stripping process can be reduced by being thermally integrated rectifying
It loses, improves the separation purity of oxygen nitrogen.In addition, the utility model cools down raw air using LNG, space division can also be greatly lowered
System start-up time.
The basic principles and main features and advantage of the utility model have been shown and described above.The technical staff of the industry
It should be appreciated that the present utility model is not limited to the above embodiments, the above embodiments and description only describe this
The principle of utility model, on the premise of not departing from the spirit and scope of the utility model, the utility model also has various change
And improvement, these various changes and improvements fall within the scope of the claimed invention.The utility model requires protection scope
It is defined by the appending claims and its equivalent thereof.
Claims (8)
1. a kind of LNG cold energy uses are thermally integrated rectifying space division system, including fan, water-cooling tower, molecular sieve, forecooler, pneumatics
Machine, subcooler I, high-pressure tower, is thermally integrated unit, lower pressure column, subcooler II, LNG storage devices, cryogenic pump at main heat exchanger, special
Sign is,
The forecooler includes air flue and natural gas path；
The main heat exchanger includes air flue, LNG accesses, nitrogen access and dirty nitrogen access；
The subcooler I includes air flue, dirty nitrogen access and nitrogen access；
Interlaced arrangement has column plate to the high-pressure tower in the height direction, and bottom is equipped with Cryogenic air import and liquid air exports,
Top is exported equipped with liquid nitrogen；
Interlaced arrangement has a column plate to the lower pressure column in the height direction, and bottom is exported equipped with liquid oxygen, top be equipped with liquid air into
Mouth, liquid nitrogen import, pure nitrogen gas outlet and dirty nitrogen outlet；
The subcooler II includes liquid air access, nitrogen access, dirty nitrogen access and liquid nitrogen access,
Wherein,
The outlet of the LNG storage devices is by pipeline successively through cryogenic pump, the LNG accesses of main heat exchanger and the forecooler
Natural gas path inlet communication；
The air inlet of the fan machine is connected to outside air, and the gas outlet of the fan is by pipeline successively through the water cooling
Air flue and the high-pressure tower bottom of tower, molecular sieve, the air flue of forecooler, the air flue of main heat exchanger, subcooler I
The air intlet in portion is connected to；
The high pressure tower bottom liquid air outlet by liquid air access of the pipeline through the subcooler II with it is described low
The liquid air inlet communication of tower top setting is pressed, the liquid nitrogen outlet at the top of the high-pressure tower is by pipeline through the subcooler II
The setting of liquid nitrogen access and lower pressure column top liquid nitrogen inlet communication；
The rectifying section of the high-pressure tower and the stripping section of lower pressure column are located at sustained height, direct contact heat transfer between the two or pass through
Heat exchanger exchanges heat；
The pure nitrogen gas outlet on the lower pressure column top passes through pipeline successively nitrogen access through the subcooler II, subcooler I
Nitrogen access I, main heat exchanger nitrogen access entrance connection,
The dirty nitrogen outlet on the lower pressure column top is logical by the dirty nitrogen of the pipeline successively dirty nitrogen access through subcooler II, subcooler I
Road, main heat exchanger dirty nitrogen access entrance connection.
2. LNG cold energy uses according to claim 1 are thermally integrated rectifying space division system, which is characterized in that the precooling
The natural gas path outlet of device is connected to by pipeline with natural gas storage or using device.
3. LNG cold energy uses according to claim 1 are thermally integrated rectifying space division system, which is characterized in that the high pressure
The heat exchange integrated unit being made of multiple heat exchangers being arranged in juxtaposition, institute are set between the rectifying section of tower and the stripping section of lower pressure column
The heat for stating high-pressure tower rectifying section is transmitted by the integrated unit that exchanges heat to the lower pressure column stripping section.
4. LNG cold energy uses according to claim 1 are thermally integrated rectifying space division system, which is characterized in that the low pressure
The stripping section of tower is nested in the rectifying section of the high-pressure tower, and the heat of the high-pressure tower rectifying section is directly carried to the lower pressure column
Evaporate section transmission.
5. LNG cold energy uses according to claim 1 are thermally integrated rectifying space division system, which is characterized in that the low pressure
The liquid oxygen outlet of tower bottom is stored with liquid oxygen by pipeline or is connected to using the entrance of device.
6. LNG cold energy uses according to claim 1 are thermally integrated rectifying space division system, which is characterized in that main heat exchanger
Outlet and the nitrogen of nitrogen access store or be connected to using the entrance of device.
7. LNG cold energy uses according to claim 1 are thermally integrated rectifying space division system, which is characterized in that the master changes
The outlet of the dirty nitrogen access of hot device is connected to the air cooling system of molecular sieve.
8. LNG cold energy uses according to claim 1 are thermally integrated rectifying space division system, which is characterized in that the low pressure
Liquid air entrance, the liquid nitrogen entrance on tower top are both provided with control valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820022052.2U CN207751222U (en) | 2018-01-07 | 2018-01-07 | A kind of LNG cold energy uses are thermally integrated rectifying space division system |
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| CN201820022052.2U CN207751222U (en) | 2018-01-07 | 2018-01-07 | A kind of LNG cold energy uses are thermally integrated rectifying space division system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007068A (en) * | 2018-01-07 | 2018-05-08 | 中国科学院工程热物理研究所 | A kind of LNG cold energy uses are thermally integrated rectifying space division system |
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2018
- 2018-01-07 CN CN201820022052.2U patent/CN207751222U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007068A (en) * | 2018-01-07 | 2018-05-08 | 中国科学院工程热物理研究所 | A kind of LNG cold energy uses are thermally integrated rectifying space division system |
| CN108007068B (en) * | 2018-01-07 | 2024-03-29 | 中国科学院工程热物理研究所 | Heat integration rectification air separation system for LNG cold energy utilization |
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