CN201560132U - Low temperature multi-effect distillation seawater desalination system adopting falling film type condenser - Google Patents
Low temperature multi-effect distillation seawater desalination system adopting falling film type condenser Download PDFInfo
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- CN201560132U CN201560132U CN2009202705586U CN200920270558U CN201560132U CN 201560132 U CN201560132 U CN 201560132U CN 2009202705586 U CN2009202705586 U CN 2009202705586U CN 200920270558 U CN200920270558 U CN 200920270558U CN 201560132 U CN201560132 U CN 201560132U
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- type condenser
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- 239000013535 sea water Substances 0.000 title claims abstract description 84
- 239000011552 falling film Substances 0.000 title claims abstract description 36
- 238000004821 distillation Methods 0.000 title claims abstract description 17
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 29
- 239000006200 vaporizer Substances 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 21
- 238000007872 degassing Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 239000010408 film Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000000284 extract Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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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
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model discloses a low temperature multi-effect distillation seawater desalination system adopting a falling film type condenser. The system comprises a multi-effect evaporator, the falling film type condenser, a vacuum extractor, a water flow pipeline, a vent duct and a feeding seawater pipe, wherein the water flow pipeline and the vent duct are connected among the effects of the evaporator; the falling film type condenser is respectively connected with a last effect evaporator, the vacuum extractor and the feeding seawater pipe and comprises a shell and components; the components comprise a water distribution device, a heat transfer tube bundle and a water receiving tray; and 2-5 components are arranged in the shell in layers. The desalination system preheats and degases the feeding seawater while condensing the steam generated by the tail effect evaporator, thus improving the condensing heat exchange efficiency of the evaporator, lessening corrosion against equipment and reducing water making cost.
Description
Technical field
The utility model relates to a kind of seawater desalination system, is specifically related to a kind of low temperature multiple-effect distillation seawater desalination system that adopts the falling film type condenser.
Background technology
Contain incondensable gases such as a certain amount of oxygen in the seawater.When adopting multi-effect distillation system to carry out sea water desaltination, incondensable gas can be overflowed in the vaporizer heat transfer process.Multi-effect distillation system generally operates under the vacuum in addition, and the small part air also can bleed becomes non-condensable gas in the vaporizer.The existence of non-condensable gas has reduced the condensation heat transfer efficient of vaporizer, and the existence meeting of oxygen simultaneously significantly increases the galvanic corrosion of heating surface bank, housing internals.Vacuum extractor is used for extracting out non-condensable gas, guarantees the operation vacuum tightness of system.Can carry a certain proportion of steam secretly when vacuum extractor is extracted non-condensable gas out, the size of non-condensable gas amount is with the load of decision pumped vacuum systems.In the common technical scheme, the seawater introducing vaporizer that do not outgas, vaporizer must use high level corrosion-resistant material to make heat-exchanging tube bundle, housing and internals, dispose jumbo vacuum extractor, in time extract non-condensable gas out in conjunction with a plurality of bleeding points are set, equipment and running cost will be increased.For the heat transfer efficiency and the operation vacuum tightness that guarantee vaporizer, multi-effect distillation system needs in time noncondensable gas to be extracted out.The scheme that the pump circulation condenser of the logical refrigerated sea water of employing tube side adds degassing tower can realize seawater preheating degassing problem, but seawater pump circulation current consumption is big, global design system complex, cost height.
Summary of the invention
The utility model discloses a kind of novel low temperature multiple-effect distillation seawater desalination system at above technological deficiency, solves the problem of the sea water desaltination degassing, improves the vaporizer heat exchange efficiency, alleviates the corrosion to equipment.
The utility model low temperature multiple-effect distillation seawater desalination system comprises multiple-effect evaporator, falling film type condenser, vacuum extractor, ventilating water pipe, breather line and charging seawater pipe, wherein ventilating water pipe comprise vaporizer between imitating the concentrated seawater ventilating water pipe and the draining ventilating water pipe between product water ventilating water pipe, last evaporator and falling film type condenser.Be connected with ventilating water pipe and breather line between the effect of vaporizer and the effect; The falling film type condenser respectively with last evaporator, vacuum extractor, charging seawater pipe coupling.
Seawater after evaporator evaporation concentrates is pooled to last evaporator by the concentrated seawater ventilating water pipe between imitating by imitating, and extracts out by water pump then; Vaporizer condense the product water that produces by product water ventilating water pipe by imitate compile after, utilize water pump to extract out from last evaporator.Be connected with the draining ventilating water pipe between falling film type condenser and last evaporator, the product fresh water that the falling film type condenser produces is pooled to last evaporator by draining with ventilating water pipe, utilizes water pump to extract out.Each single-effect evaporator is connected with the falling film type condenser by breather line, and non-condensable gas is imitated by end---the falling film type condenser of imitating the system that is pooled to from head, is evacuated the device extraction then and enters atmosphere.The charging seawater at first enters the falling film type condenser preheating degassing, enters evaporation concentration in the vaporizer again as the charging seawater then.
As embodiment preferred, falling film type condenser described in the utility model comprises housing and assembly, and assembly comprises water-distributing device, heating surface bank and drip tray; A plurality of assemblies are stratified and set in the housing.A large amount of refrigerated sea waters can be efficiently handled in the stratified design of multicompartment in the space of compactness, can effectively utilize the temperature difference between condensed steam and the seawater, enhancement of heat transfer under the certain situation of sprayed sea water temperature.
Assembly described in the utility model as required the condensing temperature and seawater temperature between the size of the temperature difference, can be 2,3,4 or 5.
As embodiment preferred, in each assembly, water-distributing device is set above heating surface bank, the below of heating surface bank is provided with drip tray and is used to accept the seawater that compiles the preheating degassing.Heating surface bank in the assembly is horizontally disposed with, and forms the multitubular bundles structure with 2-6 heating surface bank in each assembly; The interbank space of leaving is so that the effusion of non-condensable gas.
Vacuum extractor described in the utility model can be multistage stream-jet ejector or water ring vacuum pump.Vacuum extractor vacuumizes the falling film type condenser, with the non-condensable gas extraction of overflowing in the seawater and system bleeds, thereby sets up the vacuum of total system, keeps the normal working pressure of multi-effect distilling.Particularly the falling film type condenser working has the falling film type condenser heating surface bank outside and well removes the required vacuum tightness of non-condensable gas under the highest vacuum tightness.
During system works, the charging seawater at first enters the falling film type condenser and carries out the preheating degassing, enters in the vaporizer and evaporates.The charging seawater sprays to the condenser heating surface bank by falling film type condenser water-distributing device, forms falling liquid film and flows, and liquid film draws the thin big heat and mass surface-area that obtains, and helps the effusion of gas.Falling liquid film mobile seawater obtains preheating when the steam in the heating surface bank is carried out condensation, thereby is able to the good degassing under vacuum condition.After the seawater of the preheating degassing is compiled by drip tray, send into evaporation, condensation in each single-effect evaporator.Because the seawater processing that outgased this moment, the steam non-condensable gas content that evaporation of seawater goes out seldom.Steam is entering next effect when adding hot sea water, and the pressure component of restraining terminal non-condensable gas reduces, and steam fully condenses, and effectively utilizes the steam temperature difference, increases condensation heat transfer efficient.Seawater degassing back oxygen level is low in addition, can avoid substantially in the flow evaporation process because there is the galvanic corrosion that causes in oxygen, thereby alleviate the corrosion of exchange heat pipe, housing, thereby can select the cheap material of low anti-corrosion grade for use.
For preventing the fouling of seawater, the operating temperature of low temperature multiple-effect distillation seawater desalination system should not be higher than 70 ℃.
Usefulness of the present utility model is: the assembly that the falling film type condenser adopts water-distributing device, heating surface bank and drip tray to form makes the charging seawater obtain preheating outside heating surface bank, cooperate vacuum extractor, non-condensable gas in the seawater is removed, thereby significantly promote the heat exchange efficiency of vaporizer in the evaporation of seawater link, increase operational efficiency and reliability; After removing non-condensable gas, can reduce corrosive and take place, therefore can use cheap material to make the housing and the heat-transfer pipe of vaporizer, reduce system cost.Falling film type condenser pump merit consumes little, can reduce the consumption of the product water of sea water desaltination to pump function electricity.
Description of drawings
Fig. 1 is the utility model structural representation; Wherein, the 1st, falling film type condenser, 2-5 are quadruple effect evaporators, the 6th, condensed water, the 7th, condenser water-distributing device, the 8th, condenser heating surface bank, the 9th, condenser drip tray, the 10th, steam-jet ejector, the 11st, material water pump, the 12nd, concentrated seawater, the 13rd, product water, the 14th, charging seawater pipe, the 15th, from steam turbine steam, the 16th, the work aspirator, the 17th, start aspirator, the 18th, concentrated seawater ventilating water pipe, the 19th, product water ventilating water pipe.
Embodiment
Now further specify the utility model with embodiment in conjunction with the accompanying drawings, but the utility model is not limited to this.
As shown in Figure 1, the utility model low temperature multiple-effect distillation seawater desalination system comprises falling film type condenser 1, quadruple effect evaporator 2,3,4,5, vacuum extractor, ventilating water pipe, breather line and charging seawater pipe 14.Ventilating water pipe comprise vaporizer between imitating concentrated seawater ventilating water pipe 18 and the draining ventilating water pipe between product water ventilating water pipe 19, last evaporator and falling film type condenser.Wherein, be connected with breather line between adjacent two-effect evaporation device, the below connects with ventilating water pipe.Concentrated seawater 12 after the evaporation concentration is pooled to last evaporator 5 by the concentrated seawater ventilating water pipe 18 between imitating by imitating, and extracts out by water pump then.Vaporizer condense the product water 13 that produces by product water ventilating water pipe 19 from second imitate by imitate compile after, utilize water pump to extract out from last evaporator 5.Falling film type condenser 1 is arranged on system's end, and 5 of fourth evaporators are connected with the ventilating water pipe that breather line and draining are used.
Falling film type condenser 1 and charging seawater pipe coupling receive charging seawater 14 and it are carried out the preheating degassing.Falling film type condenser 1 comprises housing and assembly, and assembly comprises that water-distributing device 7, heating surface bank 8 and 9,2 assemblies of drip tray divide 2 layers to be arranged in the housing.2 heating surface banks 8 are arranged in each assembly, horizontally disposed; 8 of heating surface banks leave the space, so that the effusion of non-condensable gas; In each assembly, water-distributing device 7 is set above heating surface bank 8, the below of heating surface bank 8 is provided with drip tray 9, is used to accept the seawater that compiles after preheating outgases.The stratified design of multicompartment can efficiently be handled a large amount of refrigerated sea waters in the space of compactness, under the certain situation of sprayed sea water temperature, assembly can effectively utilize the carbonated drink temperature difference, enhancement of heat transfer.
Vacuum extractor is by work aspirator 16 and start the stream-jet ejector that aspirator 17 is formed, and is connected with falling film type condenser 1.Non-condensable gas, is evacuated device then and extracts out and enter atmosphere by end---the falling film type condenser 1 of imitating the system that is pooled to by first evaporator 2, and the non-condensable gas that bleeds with system of overflowing in the seawater is extracted out.
For preventing the fouling of seawater, the operating temperature of low temperature multiple-effect distillation seawater desalination system is not higher than 70 ℃.
It is as described below to utilize native system to carry out steam, the water cycle of sea water desaltination.
During work, at first enter steam-jet ejector 10 acting from steam turbine steam 15, the steam that injection part fourth evaporator 5 produces is through mixing after the compression together the heating steam as first single-effect evaporator 2, enter the tube side of first single-effect evaporator 2, promptly in the heat-transfer pipe.Owing to the cooling of the seawater that is subjected to managing outer spray is condensed, the fresh water after condensing contains toxic ingredients such as diamine owing to contain steam turbine steam, therefore as condensed water 6 from first evaporator 2 extraction systems.The heating that the seawater that heat-transfer pipe is outer owing to be subjected to is managed interior steam is evaporated, produce and manage the roughly steam of equivalent of interior agglomerative steam, pass vapor-liquid separating device, remove the sea water drops that to carry secretly in the steam, be introduced into the tube side of second single-effect evaporator 3 then, repeat said process as heating steam, up to fourth evaporator 5.The steam that fourth evaporator 5 evaporates, a part is by steam-jet ejector 10 injections, and remainder enters falling film type condenser 1 condensation at rear portion.Falling film type condenser 1 no longer produces new steam, the steam that transports of condensation fourth evaporator 5 only, and the system that plays discharges heat, the purpose that thermodynamic cycle is gone on.
Charging seawater in the charging seawater pipe 14 is after simple pre-treatment, and the plate-type heat exchanger of generally flowing through earlier reclaims the concentrated seawater 12 of discharging and the part heat (not shown) of product water 13, is pumped to condenser 1 then.Spray to condenser heating surface bank 8 by water-distributing device 7, form falling liquid film and flow, obtain bigger surface-area.Be the part steam that transports from fourth evaporator 5 in the heating surface bank 8, in condenser 1, be able to condensation, heat the falling liquid film mobile charging seawater outside the heating surface bank 8 simultaneously.Cooperate vacuum extractor, condenser heating surface bank 8 outsides are operated under the high vacuum, and seawater is able to the good degassing.According to the needs of regulating the charging seawater temperature, after the seawater of the preheating and the degassing is compiled by drip tray 9, a discharging part, remainder is introduced at the same time each single- effect evaporator 2,3,4,5 as the charging seawater by material water pump 11.The charging seawater enters first single-effect evaporator, 2 backs by the liquid measure distribution system, generally is spray-type, is evenly distributed to the outside surface of respectively arranging heat transfer tube.Because the effect of gravity, seawater flows along horizontally disposed circular tube external wall falling liquid film.Seawater is to arrange on the heat transfer tube under wandering with a shape or instillation shape in flow process, the liquid film of strong disturbance spread outside pipe, and therefore the interchanger of this form has the coefficient of heat transfer very high under the less energy-consumption.Warp is row's heat transfer tube too much, and spissated seawater is owing to the effect of pressure reduction between imitating flows into second single-effect evaporator 3 certainly by concentrated seawater ventilating water pipe 18.The working temperature pressure of second single-effect evaporator 3 is lower than first single-effect evaporator 2, and the concentrated seawater of inflow owing to overheated flash vaporization partly takes place, thereby reclaims a part of heat.This process repeats to take place up to fourth evaporator 5, and residue concentrated seawater 12 is drawn out of system.Vaporizer condense the product water 13 that produces by product water ventilating water pipe 19 from second imitate by imitate compile after, utilize water pump to extract out from last evaporator 5.
Claims (5)
1. low temperature multiple-effect distillation seawater desalination system that adopts the falling film type condenser, it is characterized in that: described system comprises multiple-effect evaporator, falling film type condenser, vacuum extractor, ventilating water pipe, breather line and charging seawater pipe; Be connected with ventilating water pipe and breather line between the effect of vaporizer and effect; Wherein the falling film type condenser respectively with last evaporator, vacuum extractor and charging seawater pipe coupling.
2. low temperature multiple-effect distillation seawater desalination system according to claim 1 is characterized in that: described falling film type condenser comprises housing and assembly, and assembly comprises water-distributing device, heating surface bank and drip tray, and 2-5 assembly is stratified and set in the housing.
3. low temperature multiple-effect distillation seawater desalination system according to claim 2 is characterized in that: in described assembly, the heating surface bank top is provided with water-distributing device, and the below of heating surface bank is provided with drip tray.
4. low temperature multiple-effect distillation seawater desalination system according to claim 3 is characterized in that: the heating surface bank in the described assembly is horizontally disposed with, and forms the multitubular bundles structure with 2-6 heating surface bank in each assembly, and interbank have the space as gas channel.
5. low temperature multiple-effect distillation seawater desalination system according to claim 1 is characterized in that: described vacuum extractor is multistage stream-jet ejector or water ring vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202705586U CN201560132U (en) | 2009-11-30 | 2009-11-30 | Low temperature multi-effect distillation seawater desalination system adopting falling film type condenser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202705586U CN201560132U (en) | 2009-11-30 | 2009-11-30 | Low temperature multi-effect distillation seawater desalination system adopting falling film type condenser |
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| CN201560132U true CN201560132U (en) | 2010-08-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079552B (en) * | 2009-11-30 | 2013-03-20 | 中国神华能源股份有限公司 | Low-temperature multi-effect evaporation seawater desalination system with falling film condenser |
| CN103265089A (en) * | 2013-05-07 | 2013-08-28 | 西安交通大学 | High temperature high efficiency multi-effect seawater distillation desalination apparatus and method |
| CN104606913A (en) * | 2015-01-09 | 2015-05-13 | 西安近代化学研究所 | Device for recovering solvents of explosive modeling powder water suspension granulation process |
| CN104941230A (en) * | 2014-03-24 | 2015-09-30 | 如皋市双马化工有限公司 | Distillation degassing system |
-
2009
- 2009-11-30 CN CN2009202705586U patent/CN201560132U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079552B (en) * | 2009-11-30 | 2013-03-20 | 中国神华能源股份有限公司 | Low-temperature multi-effect evaporation seawater desalination system with falling film condenser |
| CN103265089A (en) * | 2013-05-07 | 2013-08-28 | 西安交通大学 | High temperature high efficiency multi-effect seawater distillation desalination apparatus and method |
| CN103265089B (en) * | 2013-05-07 | 2014-11-05 | 西安交通大学 | High temperature high efficiency multi-effect seawater distillation desalination apparatus and method |
| CN104941230A (en) * | 2014-03-24 | 2015-09-30 | 如皋市双马化工有限公司 | Distillation degassing system |
| CN104606913A (en) * | 2015-01-09 | 2015-05-13 | 西安近代化学研究所 | Device for recovering solvents of explosive modeling powder water suspension granulation process |
| CN104606913B (en) * | 2015-01-09 | 2016-05-25 | 西安近代化学研究所 | A kind of explosive molding powder aqueous suspension prilling solvent recovery unit |
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Granted publication date: 20100825 |