CN101503224B - Low temperature multiple-effect seawater desalination evaporator and working method thereof - Google Patents
Low temperature multiple-effect seawater desalination evaporator and working method thereof Download PDFInfo
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- CN101503224B CN101503224B CN2008101545683A CN200810154568A CN101503224B CN 101503224 B CN101503224 B CN 101503224B CN 2008101545683 A CN2008101545683 A CN 2008101545683A CN 200810154568 A CN200810154568 A CN 200810154568A CN 101503224 B CN101503224 B CN 101503224B
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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
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- Y02A20/124—Water desalination
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Abstract
The invention relates to a low temperature multiple effect seawater desalination evaporator, which is characterized in that the evaporator comprises a shell, a water distribution system, a first steam-generating bank, a second steam-generating bank, a tube plate, a mist eliminator, a fresh-water bank and a concentrated water bank; the working procedure thereof is as follows: (1) steam enters into the first steam-generating bank, and then enters into the second steam-generating bank from the first steam-generating bank; (2) seawater enters into the shell pass of the shell of the evaporator from the water distribution system and sprays an evaporating pipe from top to bottom; (3) steam in the evaporating pipe is condensed into fresh water which is collected into the fresh-water bank; (4) seawater outside of the evaporating pipe of the first steam-generating bank evaporates to generate second steam and enters into the tube pass after passing the mist eliminator; (5) unevaporated seawater is collected into the concentrated water bank and is discharged after being preheated. The evaporator reduces the cost of the device as well as reducing rusty and aging, thus causing the room in the shell of the evaporator to be more fully used.
Description
(1) technical field:
The present invention relates to the desalinization field, especially a kind of low-temperature multiple-effect seawater desalination evaporator and method of work thereof.
(2) background technology:
Desalinization claims seawater desalination again, is the technology and the process of separating salt and water in the seawater.Way of distillation instant heating method is the desalination technology that adopts the earliest, is the topmost method of desalinization.Distillation sea water desalting is with the seawater heating evaporation, makes the steam condensation obtain the process of fresh water again.
Multiple-effect evaporation is to allow the seawater after heating evaporate in the evaporimeter of a plurality of series connection, the steam that previous evaporator evaporation is come out is as the thermal source of next evaporimeter, and condensation becomes fresh water, this evaporation and condensation process repeat along each effect of a string evaporimeter always, and every effect has all produced a considerable amount of distilled water.In the multiple-effect evaporation method, low temperature multiple-effect distillation (LT-MED) is one of method for saving energy in the way of distillation.
The LT-MED sea water desalting equipment is imitated stram condenser, seawater pre-heater by evaporimeter, end.The water distribution system of evaporimeter inner top, steam-generating bank and tube sheet thereof, mist eliminator, fresh-water tank, compositions such as dense water tank.Steam is input to evaporation tube inside, pipe is outer by the water distribution system sprayed sea water, carry out exchange heat inside and outside the pipe, steam condenses into fresh water and is pooled to fresh-water tank in the pipe, manage outer seawater evaporation and produce steam, filter by mist eliminator and to enter next behind the drop and imitate tube side, unevaporated seawater is pooled to dense water tank and collects.
At present, horizontal pipe falling film evaporation is generally adopted in the LT-MED desalinization, the section of evaporimeter is designed to circle more, internal heat exchange tubes Shu Weichang rectangular arranged, tube sheet are long rectangle, and the evaporimeter top is provided with water distribution system, seawater is sprayed in the steam-generating bank by water distribution system, part Absorption by Sea Water heat of vaporization is a steam, and all the other seawater flow to lower floor's evaporation tube and continue evaporation, does not have the seawater of evaporation to enter dense hydroecium at last.There is following problem at present in this form evaporimeter:
1, the diameter of LT-MED seawater desalination evaporators is general bigger, if long rectangular arranged is adopted in steam-generating bank, the cloth water area is less relatively, the sprayed sea water amount is more on the top base layer heat exchanger tube, the liquid film that forms is thick, and it is unfavorable to evaporate conducting heat, and can not make full use of heat energy;
2, because the top-down spray long flow path of seawater, and seawater also evaporating when flowing down, and the seawater amount that flows to the bottom evaporation tube is reduced gradually, and distributes and be difficult for evenly, cause the heat exchanger tube of bottom to be prone to dried wall phenomenon, easily cause heat exchanger tube aging;
3, because steam-generating bank bottom heat exchanger tube often is in dry-fire condition, cause the heat exchange area waste, do not reach the designed capacity of equipment;
4, because the evaporator shell design section is designed to circle, and tube sheet is long rectangle, thereby the enclosure interior space is more, causes waste, has increased installation cost expense and manufacturing expense simultaneously;
5, because the evaporator shell design section is designed to roundly, and large-scale sea water desalinating unit excessive overall height requires all than higher bottom support and plant designing, capital cost and mounting cost are all than higher.
(3) summary of the invention:
The object of the present invention is to provide a kind of low-temperature multiple-effect seawater desalination evaporator and method of work thereof, it can solve the deficiencies in the prior art, and reduced the installation cost expense, it is aging to reduce the heat exchanger tube corrosion simultaneously, makes the space utilization in the evaporator shell more abundant.
Technical scheme of the present invention: a kind of low-temperature multiple-effect seawater desalination evaporator, it is characterized in that it is made of housing, water distribution system, a journey steam-generating bank and two journey steam-generating banks, tube sheet, mist eliminator, fresh-water tank and dense water tank, the section of its middle shell is oval; Said water distribution system places the top of housing; Said tube sheet is connected in the housing, and a journey steam-generating bank and two journey steam-generating banks are installed in the tube sheet from the bottom to top; A said journey steam-generating bank is connected fresh-water tank respectively with two journey steam-generating banks; The said journey steam-generating bank outside is connected with mist eliminator, and the below is dense water tank.
Above-mentioned said section is oval-shaped housing, and its vertical direction is oval minor axis, and horizontal direction is a long axis of ellipse.
An above-mentioned said journey steam-generating bank and two journey steam-generating banks are arranged by the mode of flat rectangle, and promptly the line number of evaporation tube is less than columns.
Above-mentioned said tube sheet is flat rectangle.
Above-mentioned said water distribution system is selected nozzle, spray dish or shower for use.
The method of work of above-mentioned a kind of low-temperature multiple-effect seawater desalination evaporator is characterized in that it is made of following steps:
(1) steam enters in the journey steam-generating bank, enters the two journey steam-generating banks from a journey steam-generating bank again;
(2) seawater enters the shell side of evaporator shell by water distribution system, from top to bottom evaporation tube is sprayed;
(3) steam in the evaporation tube is condensed into fresh water and is pooled to fresh-water tank;
The outer seawater of the evaporation tube of (4) one journey steam-generating banks partly evaporates the generation indirect steam, by entering tube side behind the mist eliminator;
(5) unevaporated seawater is pooled to dense water tank, discharges after the preheating.
Superiority of the present invention is: the spray flow process of seawater is shortened, guarantee that seawater evenly sprays on the heat exchanger tube of each layer, improve the heat exchanger tube utilization rate, improve evaporimeter heat exchange situation, and reduce heat exchanger tube quantity, reduce the installation cost expense; 2, effectively avoid lower floor's evaporation tube owing to uneven dried wall and the dry combustion method phenomenon that causes of water distribution, it is aging to reduce the evaporation tube corrosion; 3, easier realization seawater evenly sprays, and the device water distribution system is required to reduce; 4, make full use of heat exchange area, improved the heat exchange efficiency of device under the identical situation of evaporation tube number, space utilization is more abundant in the evaporator shell; 5, simple in structure, the device of equal scale significantly reduces on the height of equipment, effectively reduces capital construction and mounting cost; 6, a journey steam-generating bank is identical with evaporation tube length in the two journey steam-generating banks, but diameter, material, quantity can be the same or different; 7, mist eliminator also can be designed to difformity, unlike material and employing different catch the foam operation principle.
(4) description of drawings:
Fig. 1 is the structural representation of the related a kind of low-temperature multiple-effect seawater desalination evaporator of the present invention.
Fig. 2 is the side view of Fig. 1.
Wherein, 1 is housing, and 2 is water distribution system, and 3-1 is that a journey steam-generating bank, 3-2 are two journey steam-generating banks, and 4 is tube sheet, and 5 is mist eliminator, and 6 is fresh-water tank, and 7 is dense water tank.
(5) specific embodiment:
Embodiment: a kind of low-temperature multiple-effect seawater desalination evaporator (seeing Fig. 1-2), it is characterized in that it is made of housing 1, water distribution system 2, a journey steam-generating bank 3-1 and two journey steam-generating bank 3-2, tube sheet 4, mist eliminator 5, fresh-water tank 6 and dense water tank 7, the section of its middle shell 1 is oval; Said water distribution system 2 places the top of housing 1; Said tube sheet 4 is connected in the housing 1, and a journey steam-generating bank 3-1 and two journey steam-generating bank 3-2 are installed in the tube sheet 4 from the bottom to top; A said journey steam-generating bank 3-1 is connected fresh-water tank 6 respectively with two journey steam-generating bank 3-2; The said journey steam-generating bank 3-1 outside is connected with mist eliminator 5, and the below is dense water tank 7.
Above-mentioned said section is oval-shaped housing 1, and its vertical direction is oval minor axis, and horizontal direction is the long axis of ellipse (see figure 1).
An above-mentioned said journey steam-generating bank 3-1 and two journey steam-generating bank 3-2 arrange by the mode of flat rectangle, and promptly the line number of evaporation tube is less than the columns (see figure 1).
Above-mentioned said tube sheet 4 is flat rectangle (see figure 1).
Above-mentioned said water distribution system 2 is selected nozzle for use.
The method of work of above-mentioned a kind of low-temperature multiple-effect seawater desalination evaporator (seeing Fig. 1-2) is characterized in that it is made of following steps:
(1) steam enters among the journey steam-generating bank 3-1, enters the two journey steam-generating bank 3-2 from a journey steam-generating bank 3-1 again;
(2) seawater enters the shell side of evaporator shell 1 by water distribution system 2, from top to bottom evaporation tube is sprayed;
(3) steam in the evaporation tube is condensed into fresh water and is pooled to fresh-water tank 6;
The outer seawater of the evaporation tube of (4) one journey steam-generating bank 3-1 partly evaporates the generation indirect steam, by entering tube side behind the mist eliminator 5;
(5) unevaporated seawater is pooled to dense water tank 7, discharges after the preheating.
Claims (3)
1. a low-temperature multiple-effect seawater desalination evaporator is characterized in that it is made of housing, water distribution system, a journey steam-generating bank and two journey steam-generating banks, tube sheet, mist eliminator, fresh-water tank and dense water tank, and the section of its middle shell is oval; Said water distribution system places the top of housing; Said tube sheet is connected in the housing, and a journey steam-generating bank and two journey steam-generating banks are installed in the tube sheet from the bottom to top; A said journey steam-generating bank is connected fresh-water tank respectively with two journey steam-generating banks; The said journey steam-generating bank outside is connected with mist eliminator, and the below is dense water tank; Said section is oval-shaped housing, and its vertical direction is oval minor axis, and horizontal direction is a long axis of ellipse; A said journey steam-generating bank and two journey steam-generating banks are arranged by the mode of flat rectangle, and promptly the line number of evaporation tube is less than columns.
2. according to the said a kind of low-temperature multiple-effect seawater desalination evaporator of claim 1, it is characterized in that said tube sheet is flat rectangle.
3. according to the said a kind of low-temperature multiple-effect seawater desalination evaporator of claim 1, it is characterized in that said water distribution system selects nozzle, spray dish or shower for use.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101545683A CN101503224B (en) | 2008-12-25 | 2008-12-25 | Low temperature multiple-effect seawater desalination evaporator and working method thereof |
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| CN2008101545683A CN101503224B (en) | 2008-12-25 | 2008-12-25 | Low temperature multiple-effect seawater desalination evaporator and working method thereof |
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| CN101503224A CN101503224A (en) | 2009-08-12 |
| CN101503224B true CN101503224B (en) | 2011-03-02 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101780988B (en) * | 2009-12-30 | 2013-01-16 | 中国第一重型机械股份公司 | Novel sea water desalinization evaporator |
| CN101885550B (en) * | 2010-07-16 | 2012-07-04 | 大连理工大学 | Multiple-effect horizontal pipe falling film evaporation sea water desalting plant with middle vapor-liquid separation |
| CN102765769A (en) * | 2012-08-15 | 2012-11-07 | 北京朗新明环保科技有限公司 | Low-temperature multiple-effect heat pipe type evaporator |
| CN106673098A (en) * | 2016-11-02 | 2017-05-17 | 天津大学 | Mounting method for uniform liquid distribution structure of transverse tube falling film evaporator |
| CN106823423A (en) * | 2017-01-20 | 2017-06-13 | 东华大学 | Semiellipse pipe falling film evaporator |
| CN109231322B (en) * | 2018-11-09 | 2021-07-09 | 浙江海盐力源环保科技股份有限公司 | Cyclone type spraying seawater desalination device |
| CN110327644A (en) * | 2019-07-22 | 2019-10-15 | 大连理工大学 | A kind of energy-saving horizontal pipe falling-film evaporating condenser |
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Effective date of registration: 20160622 Address after: 300350 Tianjin city Jinnan District Shuangqiao town Xinxin Road No. 9 Patentee after: Tianjin Baocheng Machinery Manufacturing Co., Ltd. Address before: 300457 villa No. 11, 10 Avenue, Second Street, Tianjin economic and Technological Development Zone Patentee before: Binhai Environmental Protection Equipment (Tianjin) Co., Ltd. |