CN101628740A - Method for desalting seawater by utilizing cold energy of liquefied natural gas through direct contact refrigeration - Google Patents
Method for desalting seawater by utilizing cold energy of liquefied natural gas through direct contact refrigeration Download PDFInfo
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- CN101628740A CN101628740A CN200910056323A CN200910056323A CN101628740A CN 101628740 A CN101628740 A CN 101628740A CN 200910056323 A CN200910056323 A CN 200910056323A CN 200910056323 A CN200910056323 A CN 200910056323A CN 101628740 A CN101628740 A CN 101628740A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The invention relates to a method for desalting seawater by utilizing the cold energy of liquefied natural gas through direct contact refrigeration, belonging to the technical field of refrigeration and cryogenic engineering. Firstly, heat exchange is carried out between the liquefied natural gas and secondary coolant in a heat exchanger, the liquefied natural gas is gasified to absorb heat so as to condense the water-insoluble secondary coolant by reducing the temperature thereof, the condensed secondary coolant is sprayed into a crystallizer to exchange heat with seawater through direct contact, liquid drops of the secondary coolant is evaporated to absorb heat, and therefore seawater around the liquid drops releases heat and is refrigerated into ice crystals. Prepared ice is rinsed in a rinsing tank so as to eliminate salt attached to the surface of the ice and then is led into a melting device to be melted into fresh water. The process recovers a great amount of cold energy accumulated in the liquefied natural gas, dispenses with a high consumption refrigerating unit and can effectively reduce the energy consumption of indirect refrigeration seawater desalination device, the loss of the heat exchange process is low, and the size of the device is small.
Description
Affiliated technical field
The present invention relates to a kind of freezing method for desalting seawater, directly feed in the seawater after the water-fast secondary refrigerant condensation of particularly a kind of use, utilize the direct contact refrigeration method for desalting seawater of cold energy of liquefied natural gas, belong to refrigeration and cryogenic engineering technical field.
Background technology
At present the Sweet natural gas proportion increases day by day in China's energy structure, has built up in the coastal region in east China or is building a plurality of natural gas liquids (LNG) receiving station.In entering user's pipe network process, natural gas liquids need gasify and be Sweet natural gas, can discharge a large amount of colds in the gasification.In addition, because natural gas liquids receiving station many places are in remote coastland, municipal water supply inconvenience, therefore this part cold that utilizes gasification to produce adopts the form of cold method to carry out sea water desaltination, and is significant for effectively utilizing of the energy.
The sea water desaltination mode has multiple, and wherein the cold method flowage structure is simple, and energy consumption is low.There are steam compression type vacuum-freezing process, steam absorption vacuum-freezing process, the industrialization of directly cold method, and input to use for the cold method method for desalting seawater both at home and abroad.Water in steam compression type vacuum-freezing process, the steam absorption vacuum-freezing process in the use seawater is as refrigerant, need to handle a large amount of low-pressure water steams, because the amount of compressor treating water steam is limited, limited the fresh water yield of above-mentioned two kinds of method unit's devices.And directly contact freezing promptly is directly to spray in the seawater with the immiscible liquid phase low temperature refrigerant of water, the heat absorption of refrigerant droplet evaporation, and the seawater heat release around the drop freezes to be ice crystal.Directly the refrigerant that contact freezing adopts and water is immiscible significantly improves the treatment capacity of compressor, thereby has increased the fresh water yield of unit device greatly as refrigerant.But directly the contact refrigeration method for desalting seawater needs a cover refrigeration system to provide cold for refrigerant in its device, can consume a large amount of energy.
Summary of the invention
Be deficiency and the defective that overcomes prior art, reduce the energy consumption of direct contact refrigeration sea water desaltination, the present invention proposes a kind of cold that discharges in the liquefied natural gas gasifying process that utilizes, and makes after the water-fast secondary refrigerant condensation directly to feed in the seawater, carries out sea water desaltination then.Absorb the cold that natural gas liquids discharges by secondary refrigerant in gasification, its temperature is reduced and condensation, again water-fast secondary refrigerant after the condensation is directly sprayed in a large amount of seawater in the crystallizer, the heat absorption of secondary refrigerant droplet evaporation, the seawater around it then heat release freezes to be ice crystal.The ice crystal that obtains is carried the form input washing tank of part seawater with ice slurry secretly, and with the salinity of the part fresh water that finally makes as bath water flush away ice crystal surface.Washing ice crystal later enters melter, makes fresh water after the thawing.
The present invention implements according to following technical proposals, and the inventive method comprises the steps:
1, at first natural gas liquids and water-fast secondary refrigerant carry out heat exchange in first interchanger, make the natural gas vaporization gasification, and the secondary refrigerant temperature reduces and condensation;
2, water-fast secondary refrigerant directly sprays in the interior a large amount of seawater of crystallizer after the condensation, the heat absorption of secondary refrigerant droplet evaporation, and seawater around it then heat release freezes to be ice crystal;
3, Qi Hua secondary refrigerant detaches crystallizer, absorbs the water vapour of carrying secretly in the gas phase secondary refrigerant through moisture eliminator, enters condensation once more after first interchanger and the natural gas liquids heat exchange afterwards again;
4, the ice crystal that makes is carried the form input washing tank of part seawater with ice slurry secretly, and with the salinity of the part fresh water that finally makes as bath water flush away ice crystal surface;
5, washing ice crystal later enters melter, carries out heat exchange with raw material seawater therein, and final the thawing is fresh water;
6, through effusive washing salt solution later further heat exchange in second interchanger in raw material seawater after the melter heat exchange and the washing tank, reduce the temperature of raw material seawater, thereby reduce the crystallization load.
The invention has the beneficial effects as follows: a large amount of colds that in gasification, discharge by natural gas liquids, cool off water-fast secondary refrigerant and make its condensation, make ice crystal by secondary refrigerant and the direct contact heat-exchanging of seawater, and making secondary refrigerant heat absorption gasification once again, the ice crystal that makes then finally obtains fresh water by washing, thawing.This process reclaims a large amount of colds that contain in the natural gas liquids, need not the high energy consumption unit cooler, can effectively reduce the energy consumption of indirect refrigeration sea water desalinating plant, and the heat transfer process loss is less, and plant bulk is less.
Description of drawings
Fig. 1 is the direct contact refrigeration method for desalting seawater of a present invention principle schematic.
Among the figure, 1 first interchanger, 2 moisture eliminators, 3 crystallizers, 4 washing tanks, 5 melters, 6 second interchanger.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described.
As shown in Figure 1, the inventive method comprises the steps:
1, natural gas liquids in first interchanger 1 with water-fast secondary refrigerant heat exchange, make natural gas vaporization gasification, the secondary refrigerant temperature reduces and condensation, the secondary refrigerant of employing is normal butane or Trimethylmethane;
2, water-fast secondary refrigerant normal butane or Trimethylmethane directly spray in a large amount of seawater in the crystallizer 3 after the condensation, the heat absorption of secondary refrigerant droplet evaporation, and seawater around it then heat release freezes to be ice crystal;
3, Qi Hua secondary refrigerant detaches crystallizer 3, absorbs the water vapour of carrying secretly in the gas phase secondary refrigerants through moisture eliminator 2, enters condensation once more after first interchanger 1 and the natural gas liquids heat exchange afterwards again;
4, the ice crystal that makes is carried the form input washing tank 4 of part seawater with ice slurry secretly, and from melter 5, call make the fresh water total amount 10% as bath water, the salinity of flush away ice crystal surface in washing tank 4;
5, washing ice crystal later enters melter 5, carries out heat exchange with raw material seawater therein, and final the thawing is fresh water;
6, through effusive washing salt solution later further heat exchange in second interchanger 6 in raw material seawater after melter 5 heat exchange and the washing tank 4, reduce the temperature of raw material seawater, thereby reduce the crystallization load.
Claims (6)
1, a kind of direct contact refrigeration method for desalting seawater that utilizes cold energy of liquefied natural gas is characterized in that this method for desalting seawater may further comprise the steps:
1) at first natural gas liquids and water-fast secondary refrigerant carry out heat exchange in first interchanger (1), make the natural gas vaporization gasification, and the secondary refrigerant temperature reduces and condensation;
2) water-fast secondary refrigerant directly sprays in the interior a large amount of seawater of crystallizer (3) after the condensation, the heat absorption of secondary refrigerant droplet evaporation, and seawater around it then heat release freezes to be ice crystal;
3) Qi Hua secondary refrigerant detaches crystallizer (3), absorbs the water vapour of carrying secretly in the gas phase secondary refrigerant through moisture eliminator (2), enters condensation once more after first interchanger (1) and the natural gas liquids heat exchange afterwards again;
4) ice crystal that makes is carried the form input washing tank (4) of part seawater with ice slurry secretly, and calls fresh water that part makes as bath water from melter (5), the salinity of flush away ice crystal surface in washing tank (4);
5) washing ice crystal later enters melter (5), carries out heat exchange with raw material seawater therein, and final the thawing is fresh water;
6) through effusive washing salt solution later further heat exchange in interchanger (6) in raw material seawater after melter (5) heat exchange and the washing tank (4), reduce the temperature of raw material seawater, thereby reduce the crystallization load.
2, a kind of direct contact refrigeration method for desalting seawater that utilizes cold energy of liquefied natural gas according to claim 1, it is characterized in that, described first interchanger 1 in the described step 1) is to use conventional plate-fin cryogenic heat exchanger, wherein side natural gas liquids heat absorption evaporation gasification, opposite side secondary refrigerant heat release condensation.
3, a kind of direct contact refrigeration method for desalting seawater that utilizes cold energy of liquefied natural gas according to claim 1 is characterized in that described step 1), 2) and 3) described in secondary refrigerant be normal butane or Trimethylmethane.
4, a kind of direct contact refrigeration method for desalting seawater that utilizes cold energy of liquefied natural gas according to claim 1, it is characterized in that from melter (5), calling make the fresh water total amount 10% as bath water, the salinity of flush away ice crystal surface in washing tank (4).
5, a kind of direct contact refrigeration method for desalting seawater that utilizes cold energy of liquefied natural gas according to claim 1 is characterized in that the melter (5) in the described step 5) adopts tube and shell heat exchanger.
6, a kind of direct contact refrigeration method for desalting seawater that utilizes cold energy of liquefied natural gas according to claim 1 is characterized in that second interchanger (6) adopts tube and shell heat exchanger in the described step 6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910056323A CN101628740A (en) | 2009-08-13 | 2009-08-13 | Method for desalting seawater by utilizing cold energy of liquefied natural gas through direct contact refrigeration |
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| CN200910056323A CN101628740A (en) | 2009-08-13 | 2009-08-13 | Method for desalting seawater by utilizing cold energy of liquefied natural gas through direct contact refrigeration |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583848A (en) * | 2012-02-24 | 2012-07-18 | 国家海洋局天津海水淡化与综合利用研究所 | Seawater freezing and desalting system based on liquefied natural gas cold energy and desalting method thereof |
| CN103185466A (en) * | 2013-03-08 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Method and device for exchanging heat between sea water and clear water |
| CN103459324A (en) * | 2011-01-31 | 2013-12-18 | I.D.E.技术有限公司 | Apparatus and method for freeze desalination |
| CN103739024A (en) * | 2013-12-28 | 2014-04-23 | 天津大学 | Device and method for desalting seawater by gasified absorption heat of liquefied natural gas |
| CN103771554A (en) * | 2014-01-15 | 2014-05-07 | 中国矿业大学 | Method and device for desalinating seawater by airflow impact, rotating suspension and freezing |
| CN104370398A (en) * | 2014-06-26 | 2015-02-25 | 辽宁石油化工大学 | Seawater desalination method and apparatus based on natural gas hydrate technology |
| CN104803433A (en) * | 2015-04-22 | 2015-07-29 | 中科合成油技术有限公司 | Method of freezing, concentrating and treating saline wastewater |
| CN104891593A (en) * | 2015-06-08 | 2015-09-09 | 中石化天津液化天然气有限责任公司 | High-desalting-rate seawater desalination method and device based on liquefied natural gas cold energy |
| CN105036228A (en) * | 2015-07-22 | 2015-11-11 | 中山环保产业股份有限公司 | Low temperature freezing and sublimating equipment for treating high-salinity wastewater |
| CN105384207A (en) * | 2015-12-16 | 2016-03-09 | 中科合成油技术有限公司 | Method for refrigeration condensation treatment on coal chemical industry waste water |
| CN108332507A (en) * | 2018-03-28 | 2018-07-27 | 南京工业大学 | A kind of devices and methods therefor for producing fluid ice crystal using LNG cold energy |
| CN108975438A (en) * | 2018-07-26 | 2018-12-11 | 江苏科技大学 | A kind of LNG Power Vessel LNG is regasified and fresh water preparation system and method |
| CN112856912A (en) * | 2021-01-29 | 2021-05-28 | 山西沃能化工科技有限公司 | Method for saving water for evaporative cooling device |
| CN115124103A (en) * | 2022-05-07 | 2022-09-30 | 北京中矿博能节能科技有限公司 | Crystal separation elution system and use method thereof |
| CN115342597A (en) * | 2022-07-01 | 2022-11-15 | 中国石油化工股份有限公司 | LNG cold energy used for air separation and seawater desalination system and comprehensive utilization method thereof |
-
2009
- 2009-08-13 CN CN200910056323A patent/CN101628740A/en active Pending
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103459324A (en) * | 2011-01-31 | 2013-12-18 | I.D.E.技术有限公司 | Apparatus and method for freeze desalination |
| CN103459324B (en) * | 2011-01-31 | 2016-08-24 | I.D.E.技术有限公司 | Apparatus and method for freeze desalination |
| CN102583848A (en) * | 2012-02-24 | 2012-07-18 | 国家海洋局天津海水淡化与综合利用研究所 | Seawater freezing and desalting system based on liquefied natural gas cold energy and desalting method thereof |
| CN102583848B (en) * | 2012-02-24 | 2013-08-07 | 国家海洋局天津海水淡化与综合利用研究所 | Seawater freezing and desalting system based on liquefied natural gas cold energy and desalting method thereof |
| CN103185466A (en) * | 2013-03-08 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Method and device for exchanging heat between sea water and clear water |
| CN103739024A (en) * | 2013-12-28 | 2014-04-23 | 天津大学 | Device and method for desalting seawater by gasified absorption heat of liquefied natural gas |
| CN103771554A (en) * | 2014-01-15 | 2014-05-07 | 中国矿业大学 | Method and device for desalinating seawater by airflow impact, rotating suspension and freezing |
| CN103771554B (en) * | 2014-01-15 | 2015-04-22 | 中国矿业大学 | Method and device for desalinating seawater by airflow impact, rotating suspension and freezing |
| CN104370398A (en) * | 2014-06-26 | 2015-02-25 | 辽宁石油化工大学 | Seawater desalination method and apparatus based on natural gas hydrate technology |
| CN104370398B (en) * | 2014-06-26 | 2016-01-06 | 辽宁石油化工大学 | A kind of method for desalting seawater based on Natural Gas Hydrate Technology |
| CN104803433A (en) * | 2015-04-22 | 2015-07-29 | 中科合成油技术有限公司 | Method of freezing, concentrating and treating saline wastewater |
| CN104891593A (en) * | 2015-06-08 | 2015-09-09 | 中石化天津液化天然气有限责任公司 | High-desalting-rate seawater desalination method and device based on liquefied natural gas cold energy |
| CN104891593B (en) * | 2015-06-08 | 2017-03-08 | 中石化天津液化天然气有限责任公司 | A kind of equipment with high desalinization method for desalting seawater based on cold energy of liquefied natural gas and device |
| CN105036228A (en) * | 2015-07-22 | 2015-11-11 | 中山环保产业股份有限公司 | Low temperature freezing and sublimating equipment for treating high-salinity wastewater |
| CN105036228B (en) * | 2015-07-22 | 2017-06-13 | 中山市环保产业有限公司 | A kind of cryogenic freezing sublimation apparatus for processing high-salt wastewater |
| CN105384207A (en) * | 2015-12-16 | 2016-03-09 | 中科合成油技术有限公司 | Method for refrigeration condensation treatment on coal chemical industry waste water |
| CN108332507A (en) * | 2018-03-28 | 2018-07-27 | 南京工业大学 | A kind of devices and methods therefor for producing fluid ice crystal using LNG cold energy |
| CN108332507B (en) * | 2018-03-28 | 2023-07-25 | 南京工业大学 | Device and method for preparing fluid ice crystals by utilizing LNG cold energy |
| CN108975438A (en) * | 2018-07-26 | 2018-12-11 | 江苏科技大学 | A kind of LNG Power Vessel LNG is regasified and fresh water preparation system and method |
| CN108975438B (en) * | 2018-07-26 | 2021-07-13 | 江苏科技大学 | LNG regasification and fresh water preparation system and method for LNG power ship |
| CN112856912A (en) * | 2021-01-29 | 2021-05-28 | 山西沃能化工科技有限公司 | Method for saving water for evaporative cooling device |
| CN115124103A (en) * | 2022-05-07 | 2022-09-30 | 北京中矿博能节能科技有限公司 | Crystal separation elution system and use method thereof |
| CN115342597A (en) * | 2022-07-01 | 2022-11-15 | 中国石油化工股份有限公司 | LNG cold energy used for air separation and seawater desalination system and comprehensive utilization method thereof |
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Open date: 20100120 |