CN108046361A - A kind of high power concentration distillation system for desalination and method based on induction crystallisation - Google Patents
A kind of high power concentration distillation system for desalination and method based on induction crystallisation Download PDFInfo
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- CN108046361A CN108046361A CN201711432917.9A CN201711432917A CN108046361A CN 108046361 A CN108046361 A CN 108046361A CN 201711432917 A CN201711432917 A CN 201711432917A CN 108046361 A CN108046361 A CN 108046361A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
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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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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a kind of high power concentration distillation system for desalination and method based on induction crystallisation, system includes evaporator, condenser, mother liquor tank, crystal seed tank, cyclone, pump, valve etc..Add the induction crystal seed same or similar with dirty matter nucleus when equipment starts into seawater beforehand through crystal seed tank, the crystallization formed in evaporation process dirt is made to be preferentially attached to induction seed surface, it is deposited so as to block to heat-transfer surface, contain one by cyclone, mother liquor tank after normal operation and lure the mother liquor reflux of brilliant particle to forced circulation pipeline, each effect imitated evaporator and serve as induction crystal seed is delivered to by forced circulation pump, without continuing addition induction crystal seed.The method of the present invention, whole flow process need not add chemical scale-inhibitor, can thoroughly eliminate chemical scale-inhibitor and cause added influence to environment, the present invention can realize that high power concentrates simultaneously, on the premise of production Water l oad determines, raw material seawater water withdrawal can be substantially reduced, reduces system operation power consumption.
Description
Technical field
It is dense more particularly to a kind of high power based on induction crystallisation the present invention relates to distillation sea water desalting technical field
Contracting distillation system for desalination and method for desalting seawater.
Background technology
Devoting Major Efforts To Developing utilize seawater resources, develop desalination technology, be solve water resources crisis important channel, seawater
Desalination has become many countries and solves shortage of fresh water, the Major Strategic behave for promoting the sustainable development of socio-economy.It arrives
The desalination technology of industrial applications mainly has two kinds of the way of distillation and hyperfiltration so far.Since seawater is a complexity
System, containing substantial amounts of salt, wherein carbonate, bicarbonate, sulfate, chloride that a large amount of calcium ions and magnesium ions are formed etc. make
It has very high hardness, and the salts such as the calcium sulfate particularly formed, calcium carbonate, magnesium hydroxide have retrograde solubility characteristic, temperature
Degree is higher, and solubility is lower.In desalination process is distilled, with the raising of cycles of concentration and operation temperature, these retrograde solubilities
Inorganic salts are easy to crystallization and are precipitated and are deposited in tube surface, so as to cause tube surface fouling.
Cycles of concentration is one of hot method seawater desalination system important operation technological parameter.In system water yield and raw material seawater
On the premise of the design conditions such as water quality determine, cycles of concentration is higher in evaporation process, and the total water withdrawal of system is fewer, fluid conveying
The power consumption of pump is also lower, and the strong brine concentration at the same time discharged also accordingly increases, and scaling tendency is caused to increase.Research and
High-effect mitigation and antiscaling technology and technique are developed, it is the research that hot method field of seawater desalination is paid close attention to that raising system, which is concentrated by evaporation multiplying power,
Direction.
In the more prosperity or desalination technology of the salt industries such as the U.S., Saudi Arabia, Japan, Israel using state earlier
Family, has numerous scholars targetedly to be studied with regard to the scale problems of heat-transfer pipe in multi-effect distilling seawater concentration process, develops
Method of scale inhibition based on softening pretreatment (hardness ionses such as removing calcium and magnesium in advance), acidifying and addition antisludging agent, significantly
The technological progress of hot method desalination process is promoted.
The heat-transfer pipe in although chemical scale-inhibitor is added in evaporating raw material seawater and can delay multi-effect distilling desalting plant
Scaling rate, but the antisludging agent promoted and applied at this stage so that it is difficult more than 3, generally to distill desalinating process process concentration rate
Control is between 1.5~3.If concentration rate has been more than control point, chemical scale-inhibitor also is difficult to prevent retrograde solubility inorganic salts
It deposits to form dirt in tube surface.
In addition, chemical scale-inhibitor is added in raw material seawater is evaporated to be needed to set for multiple-effect distillation seawater desalination system
Medicament addition device, this adds equipment initial investment to a certain extent, and another aspect reagent consumption amount is big, and system is caused to be transported
Row cost increases.And in desalination process is distilled, chemical agent can not be fully utilized and decompose, and understand some
Into strong brine, strong brine discharge water quality is influenced, chemical scale-inhibitor is environmentally sensitive and easily causes secondary pollution.
As seen through the above analysis, the chemical method scale inhibition skill that hot method desalting engineering generally uses is commercialized at present
Although art slows down scaling rate to a certain extent, there are still system concentration rate is not high, operating cost is high, easily to environment
The deficiencies of generating added influence.
The content of the invention
The purpose of the present invention is overcoming the shortcomings of the prior art, a kind of high power concentration based on induction crystallisation is provided
Distillation system for desalination.
Second object of the present invention is to provide a kind of high power concentration distillation desalination method based on induction crystallisation.
Technical scheme is summarized as follows：
It is a kind of based on induction crystallisation high power concentrate distillation system for desalination, raw material seawater feed pump 9 by pipeline with it is cold
Condenser 4 connects, and condenser not only 12 had been connected by cooling water pipeline with cooling-water drain pump, but after being connected with inlet valve 18 again with n
A evaporator connection, n=1-7, preferably 3, n evaporator brine outlet pass through strong brine pipeline and forced circulation pump respectively
10 import connection, the outlet of forced circulation pump 10 divides two-way, and the outlet with inlet valve 18 all the way is connected, another way successively with it is dense
The import connection of brine discharge valve 14, cyclone 6；The bottom of cyclone 6 be connected by pipeline with bleeder valve 15 after with mother liquor tank 7
Connection, after crystal seed tank 8 is connected by pipeline with crystal seed control valve 16, mother liquor tank 7, return valve 17 successively, then with forced circulation pump
10 import connection；First evaporator 1 is provided with power steam import 20 and first effect condensate drain outlet 21, and first evaporator leads to
It crosses indirect steam pipeline to be connected with next stage evaporator successively, last evaporator 3 is connected by indirect steam pipeline and condenser 4
Connect, from it is secondary effect evaporator be connected to last evaporator and condenser by product waterpipe with product water pot 5 after again with product
Water pump 11 connects, and the top at each top for imitating evaporator, the top of condenser 4 and product water pot 5 is not respectively by pipeline with coagulating
Gas control valve 19 is connected after connecting with vacuum pump 13 again.
Agitating device is provided in mother liquor tank 7.
A kind of high power concentration distillation desalination method based on induction crystallisation, includes the following steps：
1) distillation system for desalination is concentrated using a kind of above-mentioned high power based on induction crystallisation；
2) open raw material seawater feed pump 9, inlet valve 18, forced circulation pump 10, strong brine drain valve 14, bleeder valve 15,
Cooling-water drain pump 12, vacuum pump 13 and fixed gas control valve 19, are passed through by power steam import 20 into first evaporator 1
Power steam；
3) crystal seed control valve 16 is opened, the induction crystal seed in crystal seed tank 8 is passed through mother liquor tank 7；
4) raw material seawater is sent into condenser 4 by raw material seawater feed pump 9 and preheated；
5) raw material seawater after preheating, a portion is by 12 discharge of cooling-water drain pump, and another part is as supplement
Feed liquid seawater adjusts flow by inlet valve 18 and enters n evaporator evaporation；
6) continually entering with power steam, each evaporator evaporation capacity of imitating constantly increase, and system water yield gradually increases,
After product water pot 5 reaches regulation liquid level, product water pump 11 is opened, system enters stable operation shape after water yield reaches design load
State closes crystal seed control valve 16；
7) condensate drain outlet is imitated by head after heat exchange being carried out with charging seawater into the power steam in first evaporator 1
21 discharges, each to imitate the next effect recycling of indirect steam introducing that evaporator generates, the indirect steam that last evaporator generates draws
Enter condenser recycling；The product water that each effect evaporator and condenser 4 in addition to first evaporator are generated by steam condensation, into
Enter product water pot 5, discharged through product water pump 11；
8) respectively the remaining strong brine of effect evaporator evaporation is mixed with the reflux mother liquor controlled from mother liquor tank 7 through return valve 17
It is divided into two strands after being acted on by forced circulation pump 10, one and sea water mixing flow out through inlet valve 18 are again introduced into each effect steaming
Hair device is evaporated, and after another stock-traders' know-how strong brine drain valve 14 is adjusted, introduces cyclone 6；
9) after the strong brine containing dirty matter crystal enters cyclone 6, by the centrifugation of cyclone 6, coarse granule
It is moved to cyclone bottom, mother liquor tank 7 is discharged into through 15 flow control of bleeder valve in the crystalline mother solution of 6 bottom deposit of cyclone
In, cyclone supernatant is discharged as strong brine；
10) it is each to imitate evaporator and condenser 4 and 5 inside holding negative pressure shape of product water pot under the action of vacuum pump 13
State, each operation temperature for imitating evaporator are adjusted in the range of 50-100 DEG C.
Preferably, it is gypsum particle or calcite particle to induce crystal seed, can also be other common induction crystal seeds.
The grain size of crystal seed is induced to be less than or equal to 300 μm.
Advantages of the present invention：
The system of the present invention, during evaporation of seawater, crystallize the dirty matter nucleus such as calcium sulfate of precipitation be preferentially attached to it is pre-
The induction seed surface first added forms dirt, entire technique so as to effectively reduce dirty matter crystal in heat exchange pipe surface deposition
Flow need not add chemical scale-inhibitor, can thoroughly eliminate chemical scale-inhibitor added influence caused by environment, on the other hand
System medicament consumption costs can be substantially reduced.
The system of the present invention, it is insensitive to raw material seawater salinity altercation, it is stronger to material liquid adaptability, and due to system
Cycles of concentration is high, and on the premise of production Water l oad determines, the water withdrawal of raw material seawater can greatly reduce, so as to reduce system fortune
Row power consumption.
The system of the present invention is respectively imitated evaporator and can be operated in 50-100 DEG C of temperature range, it can be achieved that 90 DEG C or more
High temperature evaporation, not only the heat transfer coefficient of heat-transfer pipe is high under the conditions of higher evaporating temperature, but also can design using more effects
Number improves water generation ratio.
Description of the drawings
The high power based on induction crystallisation that Fig. 1 is the present invention concentrates distillation system for desalination schematic diagram.
Specific embodiment
The system of the present invention is further described below in conjunction with the accompanying drawings.
A kind of high power based on induction crystallisation concentrates distillation system for desalination, sees Fig. 1, by taking evaporator number n is 3 as an example,
Raw material seawater feed pump 9 is connected by pipeline with condenser 4, and condenser had both been connected by cooling water pipeline with cooling-water drain pump 12
It connects, and is connected again with 3 evaporators after being connected with inlet valve 18,3 evaporator brine outlets pass through strong brine pipeline respectively
Import with forced circulation pump 10 is connected, and the outlet of forced circulation pump 10 divides two-way, and the outlet with inlet valve 18 all the way is connected, separately
The import successively with strong brine drain valve 14, cyclone 6 is connected all the way；The bottom of cyclone 6 is connected by pipeline and bleeder valve 15
It is connected after connecing with mother liquor tank 7, after crystal seed tank 8 is connected by pipeline with crystal seed control valve 16, mother liquor tank 7, return valve 17 successively, then
Import with forced circulation pump 10 is connected；First evaporator 1 is provided with power steam import 20 and first effect condensate drain outlet 21,
First evaporator is connected by indirect steam pipeline with secondary effect evaporator 2, last evaporator 3 successively, and last evaporator 3 passes through two
Secondary jet chimney is connected with condenser 4, from secondary effect evaporator 2 to last evaporator 3 and condenser 4 by product waterpipe with
Product water pot 5 is connected after connecting with product water pump 11 again, respectively imitates the top of evaporator, the top of condenser 4 and product water pot 5
Top is connected after being connected respectively by pipeline with fixed gas control valve 19 with vacuum pump 13 again.
Agitating device is provided in mother liquor tank 7.
The number of evaporator can also be 1,2,4,5,6,7.
The method of the present invention is further described with reference to specific embodiment.
Embodiment 1
A kind of high power concentration distillation desalination method based on induction crystallisation, includes the following steps：
1) distillation system for desalination is concentrated using a kind of above-mentioned high power based on induction crystallisation, evaporator therein is with 3
Exemplified by；
2) open raw material seawater feed pump 9, inlet valve 18, forced circulation pump 10, strong brine drain valve 14, bleeder valve 15,
Cooling-water drain pump 12, vacuum pump 13 and fixed gas control valve 19, are passed through by power steam import 20 into first evaporator 1
Power steam；
3) crystal seed control valve 16 is opened, the induction crystal seed in crystal seed tank 8 is passed through mother liquor tank 7, mother liquor tank 7 is filled with stirring
It puts, the induction crystal seed in tank can be made to be in suspended state always；
4) raw material seawater is sent into condenser 4 by raw material seawater feed pump 9 and preheated；
5) raw material seawater after preheating, a portion is by 12 discharge of cooling-water drain pump, and another part is as supplement
Feed liquid seawater adjusts flow by inlet valve 18 and enters 3 evaporator evaporations；
6) continually entering with power steam, each evaporator evaporation capacity of imitating constantly increase, and system water yield gradually increases,
After product water pot 5 reaches regulation liquid level, product water pump 11 is opened, system enters stable operation shape after water yield reaches design load
State closes crystal seed control valve 16；
7) condensate drain outlet is imitated by head after heat exchange being carried out with charging seawater into the power steam in first evaporator 1
21 discharges, each to imitate the next effect recycling of indirect steam introducing that evaporator generates, the indirect steam that last evaporator generates draws
Enter condenser recycling；The product water that each effect evaporator and condenser 4 in addition to first evaporator are generated by steam condensation, into
Enter product water pot 5, discharged through product water pump 11；
8) respectively the remaining strong brine of effect evaporator evaporation is mixed with the reflux mother liquor controlled from mother liquor tank 7 through return valve 17
It is divided into two strands after being acted on by forced circulation pump 10, one and sea water mixing flow out through inlet valve 18 are again introduced into each effect steaming
Hair device is evaporated, and after another stock-traders' know-how strong brine drain valve 14 is adjusted, introduces cyclone 6；
9) after the strong brine containing dirty matter crystal enters cyclone 6, by the centrifugation of cyclone 6, coarse granule
It is moved to cyclone bottom, mother liquor tank 7 is discharged into through 15 flow control of bleeder valve in the crystalline mother solution of 6 bottom deposit of cyclone
In, cyclone supernatant is discharged as strong brine, after testing, the strong brine concentration of discharge for 20% (may also reach up 20% with
On), multiplying power is concentrated by evaporation up to more than 5；
10) it is each to imitate evaporator and condenser 4 and 5 inside holding negative pressure shape of product water pot under the action of vacuum pump 13
State, each operation temperature for imitating evaporator can be adjusted in the range of 50-100 DEG C.
For the induction crystal seed that the present embodiment uses for gypsum particle, grain size is less than or equal to 300 μm.Calcite particle can also be used
As induction crystal seed, the induction crystal seed that grain size is less than or equal to 300 μm of replacement the present embodiment forms new embodiment.
Different from traditional chemical medicament scale inhibition principle, system of the invention is that " substance affinity of the same race is far longer than for utilization
It is brilliant to add the induction same or similar with dirty matter nucleus material into raw material seawater in advance for this principle of dissimilar substances affinity "
Kind of particle, the dirty matter nucleus preferential deposition that the incrustation ion crystallization in raw material seawater is precipitated is in induction seed surface.Compared to biography
The distillation desalinating process of system, method of the invention belong to physical scale inhibition method, as long as the adsorption plane that the induction crystal seed added provides
Product is sufficient, and the dirty matter nucleus of precipitation can always be preferentially adsorbed on induction seed surface, can reach higher evaporation and concentration multiple 5
More than.
In operation, the induction crystal seed added is preferably with seawater into the same or similar gypsum particle of dirty substance, side
Stone particle etc. is solved, ensures that induction crystal seed has crystallisation fouling enough adsorption capacities, induction crystal seed grain size is usually no more than 300
μm.Induction crystal seed only needs to add in system boot, and the initial dosage for inducing crystal seed is according to raw material seawater salt content and material
Residence Time Calculation of the liquid in evaporator determines.After normal operation, without continuing to add.
Above-described specific embodiment has carried out the purpose of the present invention, technical solution and advantageous effect further
It is described in detail, it should be understood that the foregoing is merely the specific embodiments of the present invention, is not limited to this hair
Bright, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection domain within.
Claims (6)
1. it is a kind of based on induction crystallisation high power concentrate distillation system for desalination, raw material seawater feed pump (9) by pipeline with it is cold
Condenser (4) connects, and condenser had not only been connected by cooling water pipeline with cooling-water drain pump (12), but also after being connected with inlet valve (18)
It is connected again with n evaporator, the n=1-7, n evaporator brine outlet passes through strong brine pipeline and forced circulation respectively
The import connection of (10) is pumped, the outlet of forced circulation pump (10) divides two-way, and the outlet with inlet valve (18) all the way is connected, another way
The import with strong brine drain valve (14), cyclone (6) is connected successively；The bottom of cyclone (6) passes through pipeline and bleeder valve
(15) connect after be connected with mother liquor tank (7), crystal seed tank (8) by pipeline successively with crystal seed control valve (16), mother liquor tank (7), time
It flows after valve (17) connects, then is connected with the import of forced circulation pump (10)；First evaporator (1) is provided with power steam import
(20) it is connected successively with next stage evaporator by indirect steam pipeline with first effect condensate drain outlet (21), first evaporator,
Last evaporator (3) is connected by indirect steam pipeline with condenser (4), from secondary effect evaporator to last evaporator and condensation
Device is connected after being connected by product waterpipe with product water pot (5) with product water pump (11) again, each top for imitating evaporator, condensation
The top of device (4) and the top of product water pot (5) be connected respectively by pipeline with fixed gas control valve (19) after again with vacuum pump
(13) connect.
2. system according to claim 1, it is characterized in that the n=3.
3. system according to claim 1, it is characterized in that being provided with agitating device in the mother liquor tank (7).
4. a kind of high power concentration distillation desalination method based on induction crystallisation, it is characterized in that including the following steps：
1) a kind of high power based on induction crystallisation of usage right requirement 1 concentrates distillation system for desalination；
2) raw material seawater feed pump (9), inlet valve (18), forced circulation pump (10), strong brine drain valve (14), bleeder valve are opened
(15), cooling-water drain pump (12), vacuum pump (13) and fixed gas control valve (19), pass through power steam import (20) Xiang Shouxiao
Evaporator is passed through power steam in (1)；
3) crystal seed control valve (16) is opened, the induction crystal seed in crystal seed tank (8) is passed through mother liquor tank (7)；
4) raw material seawater is sent into preheating in condenser (4) by raw material seawater feed pump (9)；
5) raw material seawater after preheating, a portion pump (12) by cooling-water drain and discharge, and another part is expected as supplement
Liquid seawater adjusts flow by inlet valve (18) and enters n evaporator evaporation；
6) continually entering with power steam, each evaporator evaporation capacity of imitating constantly increase, and system water yield gradually increases, and waits to produce
After product water pot (5) reaches regulation liquid level, product water pump (11) is opened, system enters stable operation shape after water yield reaches design load
State closes crystal seed control valve (16)；
7) condensate drain outlet is imitated by head after heat exchange being carried out with charging seawater into the power steam in first evaporator (1)
(21) discharge, it is each to imitate the next effect recycling of indirect steam introducing that evaporator generates, the indirect steam that last evaporator generates
Introduce condenser recycling；The product that each effect evaporator and condenser (4) in addition to first evaporator are generated by steam condensation
Water into product water pot (5), is discharged through product water pump (11)；
8) respectively the remaining strong brine of effect evaporator evaporation is mixed with the reflux mother liquor controlled from mother liquor tank (7) through return valve (17)
It is divided into two strands after being acted on by forced circulation pump (10), one and sea water mixing flow out through inlet valve (18) are again introduced into respectively
Effect evaporator is evaporated, and after another stock-traders' know-how strong brine drain valve (14) is adjusted, introduces cyclone (6)；
9) after the strong brine containing dirty matter crystal enters cyclone (6), by the centrifugation of cyclone (6), coarse granule
It is moved to cyclone bottom, mother liquor is discharged into through bleeder valve (15) flow control in the crystalline mother solution of cyclone (6) bottom deposit
In tank (7), cyclone supernatant is discharged as strong brine；
10) under the action of vacuum pump (13), each imitate keeps negative pressure inside evaporator and condenser (4) and product water pot (5)
State, each operation temperature for imitating evaporator are adjusted in the range of 50-100 DEG C.
5. according to the method described in claim 4, it is characterized in that the induction crystal seed is gypsum particle or calcite particle.
6. method according to claim 4 or 5, it is characterized in that the grain size of the induction crystal seed is less than or equal to 300 μm.
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| CN112537813A (en) * | 2020-12-03 | 2021-03-23 | 莱芜市安邦冶金设备有限公司 | Evaporator for low-temperature multi-effect seawater desalination system |
| CN115450197A (en) * | 2022-08-30 | 2022-12-09 | 南京理工大学 | Method and system for urease-catalyzed reinforcement of calcareous sand island reef based on vacuum preloading |
| CN115450197B (en) * | 2022-08-30 | 2023-12-01 | 南京理工大学 | Method and system for reinforcing calcium sand island reef by urease catalysis based on vacuum preloading |
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