CN101832696A - Method for air separation by storing cold energy of liquefied natural gas - Google Patents
Method for air separation by storing cold energy of liquefied natural gas Download PDFInfo
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- CN101832696A CN101832696A CN201010159609A CN201010159609A CN101832696A CN 101832696 A CN101832696 A CN 101832696A CN 201010159609 A CN201010159609 A CN 201010159609A CN 201010159609 A CN201010159609 A CN 201010159609A CN 101832696 A CN101832696 A CN 101832696A
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Abstract
The invention discloses a method for air separation by storing cold energy of liquefied natural gas. The method comprises the following steps that: a cold storing groove is formed between the liquefied natural gas and an air separation device, wherein the cold storing groove is filled with a coolant which is used for storing the cold energy released when the liquefied natural gas is gasified; heat is exchanged by using a secondary refrigerant and the coolant; and the heat is exchanged between the secondary refrigerant and recycled nitrogen gas in a heat exchanger for supplying cold energy to the air separation. Compared with the prior art, the method for air separation by storing the cold energy of the liquefied natural gas is characterized by improving work efficiency of the device, greatly reducing the energy consumption of the device, and reducing the work cost, along with high use ratio and stable cold supply.
Description
Technical field
The present invention relates to use the cold-storage technical field, specifically a kind of storing cold energy of liquefied natural gas is used for the method for air separation.
Background technology
Liquefied natural gas is the depickling of natural gas process, processed, and by low temperature (162 ℃) liquid mixture that the low temperature process cryogenic liquefaction forms, its main component is a methane.Liquefied natural gas receiving station need will just can flow to the user behind the liquefied natural gas gasifying.To absorb a large amount of heats in the re-heat gasification as in the process of fuel, in theory the recuperable cold energy 870kJ/kg of liquefied natural gas.At present, this cold energy major part is released in the seawater, is not only great waste, and seawater quality has also been caused very big influence.Along with developing rapidly of liquefied natural gas, the utilization of its cold energy can come into one's own day by day.
Bibliographical information is arranged at present, and the cold that liquefied natural gas gasifying discharges is applied to air-separating plant.But all data show that these class methods all are to utilize liquefied natural gas and directly carry out heat exchange with cold junction.In actual conditions, the liquefied natural gas gasifying amount has Wave crest and wave trough, all bigger difference can be arranged in different period Various Seasonal.This just brings destabilizing factor to cold energy use, is applied to air-separating plant and certainly will be subjected to very big influence.
Summary of the invention
Technical assignment of the present invention provides the method that a kind of storing cold energy of liquefied natural gas is used for air separation.
Technical assignment of the present invention is realized in the following manner, increases cold-storage groove between liquefied natural gas and air-separating plant, and agent for storage of coldness is housed in the cold-storage groove, the cold that is discharged during agent for storage of coldness savings liquefied natural gas gasifying; Utilize refrigerating medium and agent for storage of coldness to carry out heat exchange again, refrigerating medium carries out heat exchange with circulating nitrogen gas in heat exchanger then, for air separation provides cold.
Described agent for storage of coldness is a kind of in ammonia, 30% ethylene glycol solution, the iso-butane.
Described refrigerating medium is a kind of in freon R22,30% methanol solution, carrene, the trichloro-ethylene.
The apparatus structure that this method is used comprises air compressor, heat exchanger one, heat exchanger two and rectifying column, and air compressor and heat exchanger one are communicated with by pipeline; One side of rectifying column is communicated with heat exchanger one, and opposite side is communicated with heat exchanger two; The pipeline that is communicated with between heat exchanger one and the heat exchanger two is provided with the circulating nitrogen gas compressor, and rectifying column is communicated with argon column, liquid oxygen storage tank, liquid nitrogen storage tank respectively by pipeline; Heat exchanger two is communicated with cold-storage groove by the pipeline that refrigerating medium is housed, and cold-storage groove is communicated with the liquefied natural gas pipeline.
Described argon column is communicated with the liquid argon storage tank by pipeline.
Storing cold energy of liquefied natural gas of the present invention is used for the method for air separation to be compared with prior art, has utilization rate height, the stable characteristics of cooling, has not only improved the operating efficiency of device, and has significantly reduced its energy consumption, has reduced job costs.
Description of drawings
Accompanying drawing is the structural representation that storing cold energy of liquefied natural gas is used for air-separating plant;
Among the figure: 1, air compressor; 2, heat exchanger one; 3, circulating nitrogen gas compressor; 4, rectifying column; 5, argon column; 6, heat exchanger two; 7, liquid argon storage tank; 8, cold-storage groove; 9, liquid oxygen storage tank; 10, liquid nitrogen storage tank; 11, liquefied natural gas pipeline; 12, coolant ducts.
The specific embodiment
Embodiment 1:
Air compressor 1 and heat exchanger 1 are communicated with by pipeline; One side of rectifying column 4 is communicated with heat exchanger 1, and opposite side is communicated with heat exchanger 26; The pipeline that is communicated with between heat exchanger 1 and the heat exchanger 26 is provided with circulating nitrogen gas compressor 3, and rectifying column 4 is communicated with 9 with argon column 5, liquid oxygen storage tank 7, liquid nitrogen storage tank respectively by pipeline; Argon column 5 is communicated with liquid argon storage tank 10 by pipeline; Heat exchanger 26 is communicated with cold-storage groove 8 by coolant ducts 12, and cold-storage groove 8 is communicated with liquefied natural gas pipeline 11.
Wherein the refrigerating medium in the coolant ducts 12 is freon R22, and the agent for storage of coldness in the cold-storage groove 8 is an ammonia; The cold that is discharged when at first the ammonia in the cold-storage groove 8 stores liquefied natural gas gasifying, freon R22 in the coolant ducts 12 and ammonia heat exchange then, freon R22 and circulating nitrogen gas heat exchange in heat exchanger 6 afterwards, the cold of freon R22 has just been passed to the circulating nitrogen gas in the air-separating plant like this, air in the circulating nitrogen gas cooling air-separating plant, cooled air enters rectifying column 4 rectifying, according to component boiling point difference in the air, obtains liquid oxygen, liquid nitrogen and liquid argon successively.
Embodiment 2:
Air compressor 1 and heat exchanger 1 are communicated with by pipeline; One side of rectifying column 4 is communicated with heat exchanger 1, and opposite side is communicated with heat exchanger 26; The pipeline that is communicated with between heat exchanger 1 and the heat exchanger 26 is provided with circulating nitrogen gas compressor 3, and rectifying column 4 is communicated with 9 with argon column 5, liquid oxygen storage tank 7, liquid nitrogen storage tank respectively by pipeline; Argon column 5 is communicated with liquid argon storage tank 10 by pipeline; Heat exchanger 26 is communicated with cold-storage groove 8 by coolant ducts 12, and cold-storage groove 8 is communicated with liquefied natural gas pipeline 11.
Wherein the refrigerating medium in the coolant ducts 12 is 30% methanol solution, and the agent for storage of coldness in the cold-storage groove 8 is 30% ethylene glycol solution; The cold that is discharged when at first the ethylene glycol solution of 30% in the cold-storage groove 8 stores liquefied natural gas gasifying, the methanol solution of 30% in the coolant ducts 12 and 30% ethylene glycol solution heat exchange then, 30% methanol solution and circulating nitrogen gas heat exchange in heat exchanger 6 afterwards, the cold of such 30% methanol solution has just been passed to the circulating nitrogen gas in the air-separating plant, air in the circulating nitrogen gas cooling air-separating plant, cooled air enters rectifying column 4 rectifying, according to component boiling point difference in the air, obtain liquid oxygen, liquid nitrogen and liquid argon successively.
Embodiment 3:
Air compressor 1 and heat exchanger 1 are communicated with by pipeline; One side of rectifying column 4 is communicated with heat exchanger 1, and opposite side is communicated with heat exchanger 26; The pipeline that is communicated with between heat exchanger 1 and the heat exchanger 26 is provided with circulating nitrogen gas compressor 3, and rectifying column 4 is communicated with 9 with argon column 5, liquid oxygen storage tank 7, liquid nitrogen storage tank respectively by pipeline; Argon column 5 is communicated with liquid argon storage tank 10 by pipeline; Heat exchanger 26 is communicated with cold-storage groove 8 by coolant ducts 12, and cold-storage groove 8 is communicated with liquefied natural gas pipeline 11.
Wherein the refrigerating medium in the coolant ducts 12 is a carrene, and the agent for storage of coldness in the cold-storage groove 8 is an iso-butane; The cold that is discharged when at first the iso-butane in the cold-storage groove 8 stores liquefied natural gas gasifying, carrene in the coolant ducts 12 and iso-butane heat exchange then, carrene and circulating nitrogen gas heat exchange in heat exchanger 6 afterwards, the cold of carrene has just been passed to the circulating nitrogen gas in the air-separating plant like this, air in the circulating nitrogen gas cooling air-separating plant, cooled air enters rectifying column 4 rectifying, according to component boiling point difference in the air, obtains liquid oxygen, liquid nitrogen and liquid argon successively.
Embodiment 4:
Air compressor 1 and heat exchanger 1 are communicated with by pipeline; One side of rectifying column 4 is communicated with heat exchanger 1, and opposite side is communicated with heat exchanger 26; The pipeline that is communicated with between heat exchanger 1 and the heat exchanger 26 is provided with circulating nitrogen gas compressor 3, and rectifying column 4 is communicated with 9 with argon column 5, liquid oxygen storage tank 7, liquid nitrogen storage tank respectively by pipeline; Argon column 5 is communicated with liquid argon storage tank 10 by pipeline; Heat exchanger 26 is communicated with cold-storage groove 8 by coolant ducts 12, and cold-storage groove 8 is communicated with liquefied natural gas pipeline 11.
Wherein the refrigerating medium in the coolant ducts 12 is a trichloro-ethylene, and the agent for storage of coldness in the cold-storage groove 8 is 30% ethylene glycol solution; The cold that is discharged when at first the ethylene glycol solution of 30% in the cold-storage groove 8 stores liquefied natural gas gasifying, trichloro-ethylene in the coolant ducts 12 and 30% ethylene glycol solution heat exchange then, trichloro-ethylene and circulating nitrogen gas heat exchange in heat exchanger 6 afterwards, the cold of trichloro-ethylene has just been passed to the circulating nitrogen gas in the air-separating plant like this, air in the circulating nitrogen gas cooling air-separating plant, cooled air enters rectifying column 4 rectifying, according to component boiling point difference in the air, obtain liquid oxygen, liquid nitrogen and liquid argon successively.
Claims (5)
1. storing cold energy of liquefied natural gas is used for the method for air separation, and it is characterized in that increases cold-storage groove between liquefied natural gas and air-separating plant, and agent for storage of coldness is housed in the cold-storage groove, the cold that is discharged during agent for storage of coldness savings liquefied natural gas gasifying; Utilize refrigerating medium and agent for storage of coldness to carry out heat exchange again, refrigerating medium carries out heat exchange with circulating nitrogen gas in heat exchanger then, for air separation provides cold.
2. storing cold energy of liquefied natural gas according to claim 1 is used for the method for air separation, it is characterized in that described agent for storage of coldness is a kind of in ammonia, 30% ethylene glycol solution, the iso-butane.
3. storing cold energy of liquefied natural gas according to claim 1 is used for the method for air separation, it is characterized in that described refrigerating medium is a kind of in freon R22,30% methanol solution, carrene, the trichloro-ethylene.
4. storing cold energy of liquefied natural gas according to claim 1 is used for the method for air separation, it is characterized in that the apparatus structure that this method is used comprises air compressor, heat exchanger one, heat exchanger two and rectifying column, air compressor and heat exchanger one are communicated with by pipeline; One side of rectifying column is communicated with heat exchanger one, and opposite side is communicated with heat exchanger two; The pipeline that is communicated with between heat exchanger one and the heat exchanger two is provided with the circulating nitrogen gas compressor, and rectifying column is communicated with argon column, liquid oxygen storage tank, liquid nitrogen storage tank respectively by pipeline; Heat exchanger two is communicated with cold-storage groove by the pipeline that refrigerating medium is housed, and cold-storage groove is communicated with the liquefied natural gas pipeline.
5. storing cold energy of liquefied natural gas according to claim 4 is used for the method for air separation, it is characterized in that described argon column is communicated with the liquid argon storage tank by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010159609A CN101832696A (en) | 2010-04-29 | 2010-04-29 | Method for air separation by storing cold energy of liquefied natural gas |
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| CN201010159609A CN101832696A (en) | 2010-04-29 | 2010-04-29 | Method for air separation by storing cold energy of liquefied natural gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102642966A (en) * | 2012-04-23 | 2012-08-22 | 西安交通大学 | Cooling crystallization desalting system for high-salinity waste water |
| CN103438665A (en) * | 2013-09-01 | 2013-12-11 | 杭州哲达科技股份有限公司 | Device and method for lowering comprehensive power unit consumption of air separation unit |
| CN104019629A (en) * | 2014-05-14 | 2014-09-03 | 中国海洋石油总公司 | Air separation method capable of being matched with cold energy supply in receiving station |
| CN113717697A (en) * | 2021-05-28 | 2021-11-30 | 中国科学院理化技术研究所 | Secondary refrigerant, preparation method, cooling structure, semiconductor laser bar and heat sink system |
| CN114748968A (en) * | 2022-06-10 | 2022-07-15 | 常州大恒环保科技有限公司 | Energy storage type organic tail gas recovery method and device utilizing liquid nitrogen cold energy |
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| CN1407303A (en) * | 2001-08-19 | 2003-04-02 | 中国科学技术大学 | Air separator by utilizing cold energy of liquefied natural gas |
| CN1431107A (en) * | 2003-01-17 | 2003-07-23 | 西安交通大学 | Car air conditioner making use of quantity of cold of liquefied natural gas |
| CN1616908A (en) * | 2004-10-28 | 2005-05-18 | 苏州市兴鲁空分设备科技发展有限公司 | Method and device for separating air |
| CN1873357A (en) * | 2005-04-25 | 2006-12-06 | 林福粦 | Air separation system for recycling cold energy of liquified natural gas |
| CN101344354A (en) * | 2007-09-29 | 2009-01-14 | 上海海事大学 | LNG cold energy utilization method |
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2010
- 2010-04-29 CN CN201010159609A patent/CN101832696A/en active Pending
Patent Citations (5)
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| CN1407303A (en) * | 2001-08-19 | 2003-04-02 | 中国科学技术大学 | Air separator by utilizing cold energy of liquefied natural gas |
| CN1431107A (en) * | 2003-01-17 | 2003-07-23 | 西安交通大学 | Car air conditioner making use of quantity of cold of liquefied natural gas |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102642966A (en) * | 2012-04-23 | 2012-08-22 | 西安交通大学 | Cooling crystallization desalting system for high-salinity waste water |
| CN102642966B (en) * | 2012-04-23 | 2013-07-24 | 西安交通大学 | Cooling crystallization desalting system for high-salinity waste water |
| CN103438665A (en) * | 2013-09-01 | 2013-12-11 | 杭州哲达科技股份有限公司 | Device and method for lowering comprehensive power unit consumption of air separation unit |
| CN103438665B (en) * | 2013-09-01 | 2015-06-17 | 杭州哲达科技股份有限公司 | Device and method for lowering comprehensive power unit consumption of air separation unit |
| CN104019629A (en) * | 2014-05-14 | 2014-09-03 | 中国海洋石油总公司 | Air separation method capable of being matched with cold energy supply in receiving station |
| CN104019629B (en) * | 2014-05-14 | 2016-01-06 | 中国海洋石油总公司 | A kind of air separating method that can match with receiving station's cold energy supply |
| CN113717697A (en) * | 2021-05-28 | 2021-11-30 | 中国科学院理化技术研究所 | Secondary refrigerant, preparation method, cooling structure, semiconductor laser bar and heat sink system |
| CN113717697B (en) * | 2021-05-28 | 2024-02-23 | 中国科学院理化技术研究所 | Cold carrier, preparation method, cooling structure, semiconductor laser bar and heat sink system |
| CN114748968A (en) * | 2022-06-10 | 2022-07-15 | 常州大恒环保科技有限公司 | Energy storage type organic tail gas recovery method and device utilizing liquid nitrogen cold energy |
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Application publication date: 20100915 |