CN103539160A - Method for preparing salt from brine in solar pond - Google Patents
Method for preparing salt from brine in solar pond Download PDFInfo
- Publication number
- CN103539160A CN103539160A CN201310516253.XA CN201310516253A CN103539160A CN 103539160 A CN103539160 A CN 103539160A CN 201310516253 A CN201310516253 A CN 201310516253A CN 103539160 A CN103539160 A CN 103539160A
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- China
- Prior art keywords
- solar pond
- salt
- brine
- hot brine
- solar
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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
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/10—Solar heat collectors using working fluids the working fluids forming pools or ponds
- F24S10/13—Salt-gradient ponds
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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
- Y02A20/138—Water desalination using renewable energy
- Y02A20/142—Solar thermal; Photovoltaics
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
Abstract
The invention discloses a method for preparing a salt from brine in a solar pond. The method comprises the following technical steps: establishing the solar pond, realizing the heat-absorption operation of the solar pond, extracting the hot brine and preparing the salt from the hot brine in a flash evaporation manner, namely sequentially injecting salina brine, desalted concentrated seawater and fresh water into a solar pond device at a ratio of 0.5:0.4:0.1; drying the solar pond injected with the water in the sun; extracting the hot brine from one side of the solar pond after the temperature at the bottom in the solar pond reaches more than 70 DEG C; crystallizing the extracted hot brine in a closed evaporator in the flash evaporation manner so as to obtain a salt product. The salina brine, the desalted concentrated seawater and the fresh water are taken as working media for the solar pond, so that the cost of raw materials is low. Thus, the energy consumption during salt preparation is greatly decreased and the precious land resource is saved. The brine preparing period is shortened by preparing the salt via the evaporator, so that the quality of the salt is greatly improved. Thus, the method for preparing the salt from the brine is environmental-friendly, low in cost, simple and convenient in operation and strong in practicability.
Description
Technical field
The invention belongs to solar pond and utilize technical field, relate to a kind of bittern salt extraction process that utilizes solar pond.
Background technology
Solar pond is the brine tank with certain salt concn gradient, is considered to the most promising collection and stores one of means of sun power.The operation logic of solar pond is to utilize non-troposphere, middle part salt concn to be steady state and to suppress convection heat losses, thus by the solar radiation thermal isolation absorbing in lower troposphere.Solar pond has that thermal capacity is large, accumulation of heat over a long time, the advantage such as cheap, and people have carried out its research at aspects such as generating, heating.Sea-food and fishery products that Guangxi University is difficult to overwintering to some utilize solar pond to carry out the experiment of heat supply cultivation, and result shows, winter, the average survival of fishery products reached 69.7%, and average growth rate is 166.6%.
Salt is not only the requisite of human survival, is also the basic raw material of chemical industry.At present, domestic soda industry with salt consumption, reached 80% of overall consumption salt amount, in national economy, occupy an important position.Present stage, the normal salt extraction process adopting was solar saltworks, the seawater that is placed in salt Tanaka is exposed to the sun under sunlight, make the salt crystallization in seawater, still, there is the problems such as salt pan floor space is large, the salt manufacturing cycle is long, crude salt per unit area yield is low, of poor quality in solar saltworks method.
Summary of the invention
The problems referred to above that exist for prior art solar saltworks, the present invention proposes a kind of bittern salt extraction process that utilizes solar pond, its object is, the solar pond that Bittern of Salt Pan and concentrated seawater are working medium is take in foundation, utilize solar pond can hold thermal property, the lower tropospheric saturated bittern of heating, then take out and use the crystallization salt manufacturing of dewatering of the mode of shwoot, to overcome high density seawater under the condition of high humidity in summer, the defect that steam output significantly reduces, solar pond peace is shone to pond and combine, improve solar energy utilization ratio and salt manufacturing efficiency, reduce salt manufacturing cost.
The bittern salt extraction process that utilizes solar pond the present invention relates to, technological step comprises:
(1) foundation of solar pond
According to Bittern of Salt Pan: concentrated seawater after desalination: fresh water is the ratio of 0.5 ︰ 0.4 ︰ 0.1, in solar pond device, inject successively Bittern of Salt Pan, desalination concentrated seawater and fresh water afterwards, obtain the salt gradient solar pond of three-decker after standing.
(2) solar pond heat absorption operation
Under being placed in to the sun, the solar pond of injecting Bittern of Salt Pan, the rear concentrated seawater of desalination and fresh water is exposed to the sun, heat absorption operation.Solar pond run duration, timing every day, spot sampling are measured temperature, the salinity of solar pond solution.According to the experimental data recording, every 5～10 days, toward solar pond solution top layer, spray fresh water, the disturbance of ambient conditions to Chi Shui such as to avoid evaporating, keep the salt gradient of solar pond.
(3) hot brine extracts
Solar pond operation for some time, bottom temp reach 70 ℃ above after, in a side of solar pond, apart from 0.2m place, solar pond bottom, extract a certain amount of hot brine.When extracting hot brine, at the cold brine of relative opposite side re-injection equivalent.
(4) hot brine shwoot salt manufacturing
The hot brine extracting is placed in to the salt manufacturing of closed vaporizer shwoot, and crystallization obtains product salt, and salt sample is carried out to analyzing and testing.
It is working medium that solar pond in the present invention be take concentrated seawater, fresh water after Bittern of Salt Pan, desalination, cost of material is cheap, significantly reduce salt manufacturing energy consumption, save valuable land resources, vaporizer salt manufacturing can make the brewed brine cycle shorten, the quality of salt increases substantially, be environmental protection, with low cost, move easy, practical bittern salt extraction process.
Embodiment
Below in conjunction with experimental example, the invention will be further described.
Test is to carry out at Summer over North China, 45 days by a definite date.Testing solar pond device specification used is 1.5 * 1.5m, and high 1.8m, is inverted trapezoidal, the thick urethane foam insulation of about 150mm for outside of solar pond wall.
The foundation of solar pond: first pour into the Bittern of Salt Pan that concentration is 17Bh in solar pond, the perfusion degree of depth of Bittern of Salt Pan is 0.8m; Concentrated seawater after the desalination that the concentration of pouring into subsequently 0.6m is 5Bh; Finally pour into the clear water of about 0.15m.Standing 15 days, obtain the salt gradient solar pond of three-decker.
The heat absorption operation of solar pond: solar pond run duration, every day, 10:00 was respectively from getting 50ml solution, the temperature of measure sample, salinity apart from solar pond bottom 0.3m, 0.8m, 1.2m.Every 5 days, toward solar pond top layer, spray 0.2m
3fresh water, the disturbance of ambient conditions to Chi Shui such as to avoid evaporating, keep the salt gradient of solar pond.
Hot brine extracts: solar pond operation is after 25 days, and solar pond bottom temp reaches 72 ℃.Now, in a side of solar pond, apart from 0.2m place, solar pond bottom, extract 0.4m
3hot brine, simultaneously at relative opposite side apart from 0.2m place, bottom, re-injection 0.4m
3cold brine.
Hot brine shwoot salt manufacturing: the hot brine taking out of take is carried out shwoot experiment as stock liquid, and charging saturated bittern temperature is 68 ℃, and crystallization obtains product salt.
The salt sample obtaining is carried out to analyzing and testing, product index is as follows: the main content 98.90% of sodium-chlor, moisture≤0.30%, water-insoluble≤0.08%, calcium ions and magnesium ions≤0.40%, sulfate ion≤0.50%, meets < < GB5462-2003 Industrial Salt > > one-level purified salt standard.
Claims (3)
1. a bittern salt extraction process that utilizes solar pond, is characterized in that, technological step comprises that foundation, solar pond heat absorption operation, the hot brine of solar pond extract and the salt manufacturing of hot brine shwoot; The foundation of described solar pond is injected successively Bittern of Salt Pan, the rear concentrated seawater of desalination and fresh water in solar pond device, and after salt pan Lu Shui ︰ desalination, the ratio of dense Hai Shui ︰ fresh water is 0.5 ︰ 0.4 ︰ 0.1; Described solar pond heat absorption operation, is exposed to the sun under the solar pond of water filling is placed in to the sun, the temperature of Timing measurement solar pond solution, salinity and spray fresh water toward solar pond solution top layer; Described hot brine extracts, and after solar pond inner bottom part temperature reaches more than 70 ℃, from a side of solar pond, extracts hot brine, meanwhile, and at the cold brine of relative opposite side re-injection equivalent; The salt manufacturing of described hot brine shwoot, is placed in the salt manufacturing of closed vaporizer shwoot by the hot brine extracting, and crystallization obtains product salt.
2. the bittern salt extraction process that utilizes solar pond according to claim 1, it is characterized in that, in described solar pond heat absorption operating procedure, timing every day, spot sampling are measured temperature, the salinity of solar pond solution, every 5～10 days, toward solar pond solution top layer, spray fresh water, the disturbance of ambient conditions to Chi Shui such as to avoid evaporating, keep the salt gradient of solar pond.
3. the bittern salt extraction process that utilizes solar pond according to claim 1, is characterized in that, in described hot brine extraction step, in a side of solar pond, apart from 0.2m place, solar pond bottom, extracts a certain amount of hot brine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310516253.XA CN103539160A (en) | 2013-10-28 | 2013-10-28 | Method for preparing salt from brine in solar pond |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310516253.XA CN103539160A (en) | 2013-10-28 | 2013-10-28 | Method for preparing salt from brine in solar pond |
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| Publication Number | Publication Date |
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| CN103539160A true CN103539160A (en) | 2014-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201310516253.XA Pending CN103539160A (en) | 2013-10-28 | 2013-10-28 | Method for preparing salt from brine in solar pond |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104016377A (en) * | 2014-05-27 | 2014-09-03 | 浙江绿海制盐有限责任公司 | Solarization recrystallization salt-manufacturing technology |
| CN104310431A (en) * | 2014-10-10 | 2015-01-28 | 中盐工程技术研究院有限公司 | Production method and device for making salt by concentrating brine by using terrestrial heat |
| CN108439675A (en) * | 2018-03-27 | 2018-08-24 | 华电电力科学研究院有限公司 | A kind of solar energy desalination utilization system and method |
| CN111908533A (en) * | 2020-06-26 | 2020-11-10 | 中国轻工业长沙工程有限公司 | Treatment process of high-concentration high-salt mother liquor in zero discharge of wastewater |
Citations (3)
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| US4243392A (en) * | 1979-04-11 | 1981-01-06 | Foote Mineral Company | Process for solar concentration of lithium chloride brine |
| US4333736A (en) * | 1979-01-26 | 1982-06-08 | Solmat Systems Ltd. | Method of utilizing solar ponds for effecting controlled temperature changes of solutions particularly in processes involving the dissolution and/or precipitation of salts |
| CN101704560A (en) * | 2009-07-29 | 2010-05-12 | 林晓山 | Technique for desalting sea water, making salt and comprehensively using by-products thereof by utilizing wind energy, solar energy and heat pump technologies |
-
2013
- 2013-10-28 CN CN201310516253.XA patent/CN103539160A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4333736A (en) * | 1979-01-26 | 1982-06-08 | Solmat Systems Ltd. | Method of utilizing solar ponds for effecting controlled temperature changes of solutions particularly in processes involving the dissolution and/or precipitation of salts |
| US4243392A (en) * | 1979-04-11 | 1981-01-06 | Foote Mineral Company | Process for solar concentration of lithium chloride brine |
| CN101704560A (en) * | 2009-07-29 | 2010-05-12 | 林晓山 | Technique for desalting sea water, making salt and comprehensively using by-products thereof by utilizing wind energy, solar energy and heat pump technologies |
Non-Patent Citations (2)
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| 李积才: "盐湖太阳能的利用-太阳池", 《盐湖研究》 * |
| 高从皆，陈国华主编: "《海水淡化技术与工程手册》", 30 April 2004, 化学工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104016377A (en) * | 2014-05-27 | 2014-09-03 | 浙江绿海制盐有限责任公司 | Solarization recrystallization salt-manufacturing technology |
| CN104016377B (en) * | 2014-05-27 | 2015-10-28 | 浙江绿海制盐有限责任公司 | A kind of Exposure to Sunlight recrystallization salt producing craft |
| CN104310431A (en) * | 2014-10-10 | 2015-01-28 | 中盐工程技术研究院有限公司 | Production method and device for making salt by concentrating brine by using terrestrial heat |
| CN108439675A (en) * | 2018-03-27 | 2018-08-24 | 华电电力科学研究院有限公司 | A kind of solar energy desalination utilization system and method |
| CN111908533A (en) * | 2020-06-26 | 2020-11-10 | 中国轻工业长沙工程有限公司 | Treatment process of high-concentration high-salt mother liquor in zero discharge of wastewater |
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Application publication date: 20140129 |