CN101712521B - Method for spraying and desalting through residual pressure of reverse osmosis concentrated water - Google Patents
Method for spraying and desalting through residual pressure of reverse osmosis concentrated water Download PDFInfo
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- CN101712521B CN101712521B CN2009100711676A CN200910071167A CN101712521B CN 101712521 B CN101712521 B CN 101712521B CN 2009100711676 A CN2009100711676 A CN 2009100711676A CN 200910071167 A CN200910071167 A CN 200910071167A CN 101712521 B CN101712521 B CN 101712521B
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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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- 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
- Y02A20/131—Reverse-osmosis
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The invention establishes a method for treating waste concentrated saltwater of reverse osmosis systems. The method mainly comprises the following steps that: the residual pressure of concentrated water produced by the self of a reverse osmosis system during water production is utilized to form high-salt spray so as to save power needed by conventional atomization; tiny water droplets quickly evaporate in floating air so as to separate water, salt and other impurities; meanwhile, organic matter contained by the water is oxidized to be carbon dioxide; vapor is input into a condensing chamber to turn into pure water, while salt and high-power tail water fall to the bottom of a separation chamber; the tail water and initial inflow water are mixed and circulated and then continue to be atomized and concentrated to a saturation state; the contained salt is subjected to heat-exchange condensation and then crystallization and precipitation; and water purification and salinity removal of reverse osmosis concentrated water are finally realized. The desalting and pollutant-reducing method for reverse osmosis concentrated water is suitable for the separation of the waste concentrated saltwater produced by every type of reverse osmosis systems.
Description
Technical field
The invention belongs to water-treatment technology field, relate to the dense water purification of counter-infiltration system in the fields such as Treatment of Industrial Water, environmental pollution improvement, seawater and the desalination of bitter salt water.A kind of method for spraying and desalting through residual pressure of reverse osmosis concentrated water of saying so more specifically.
Background technology
Reverse osmosis technology utilizes external force (overcoming osmotic pressure) and by the selection crown_interception of film, with solute in the solution and separated from solvent, thereby reaches the purpose of pure water quality.This technology has been widely used in fields such as Treatment of Industrial Water, environmental pollution improvement, seawater and the desalination of bitter salt water at present; But in processing procedure; Receive the influence of the factor such as material, water quality kind of film; Discharge with a large amount of strong brines in the time of desalination essence water generates, account for about 1/3 of amount of inlet water.Reverse osmosis concentrated salt solution has the saliferous height, contains characteristics such as difficult degradation pollutant height, so the existing conventional method is difficult to effectively handle.
With regard to present desalination method, can mainly be divided into: 5 types of heating power method (multi-effect distilling, multistage flash evaporation, solar distilling, freezing etc.), chemical method (ion-exchange, solvent extraction, hydrate, chemical precipitation method), electricity-embrane method (electro-deionisation, electroosmose process), electric absorption method, pressure-embrane methods (multistage counter-infiltration, nano filtering process) etc.Wherein chemical method desalination kind is few, and the desalination degree is low, can only remove the salt that those can convert the indissoluble material to, i.e. the salt of cation compositions such as calcium, magnesium, iron, manganese.Salt for cation compositions such as sodium, potassium is then powerless.When particularly chlorine ion concentration was higher in former water, its sedimentation effect was had a greatly reduced quality, and the scope of application is tied greatly; Technology initial stage equipment investments such as electricity-embrane method (electro-deionisation, electroosmose process) and electricity absorption are big, and pretreating process is complicated, manage and move loaded down with trivial details, have higher water producing cost for the processing of reverse osmosis concentrated water; In the heating power method, solar distilling, freezing are limit by natural conditions, and evaporation is lower with crystalline rate, are difficult to adapt to industrial circle big yield treatment requirement.Multi-effect distilling (MED), multistage flash evaporation methods such as (MSF) all are to utilize low grade residual heat in the container of a plurality of orderly arrangements, high strong brine heating evaporation to be produced water vapour, obtain high-quality fresh water after the steam condensation.Multistage flash evaporation (MSF) is taked the method evaporation seawater of step-down dilatation flash distillation, and multi-effect distilling (MED) then is directly to heat evaporation of seawater with steam to go out steam, because the two technical process, the progression of MSF system will be more than the effect number of MED system.For improving energy utilization rate, reducing cost, seeking efficiently, heat pump is still a unsolved difficult problem.
Pressure-embrane method (multistage counter-infiltration, nano filtering process) is to since dropping into application from the seventies in 20th century; All seeking the method for handling dense water, reducing the associative operation expense always; But only rely on the membrane technology of development plural serial stage to solve dense water problems not enough, also need additive method to reduce cost.Lot of energy is used to this type systematic high pressure is provided regrettably, and this part pressure major part has been lost in vain, if calculate according to common 40% the rate of recovery, accounts for 60% feed pressure energy in the strong brine.Because method still not yet in effect is handled dense water problems at present, increased the water producing cost when reverse osmosis unit is handled, wasted a large amount of energy simultaneously, the strong brine environmental pollution is still the difficult problem that can't effectively solve.
Summary of the invention
Main purpose of the present invention is to set up technology and the device that a cover is used to handle the high strong brine of counter-infiltration system; This method mainly is that the dense water overbottom pressure of utilizing counter-infiltration system in system water process, self to produce forms the haline water mist, saves conventional atomizing required drive, and fine liquid particles is evaporation rapidly in flow air; Water and the salt impurity that grades separates; Contained organic matter is oxidized to carbon dioxide in the water simultaneously, and steam input condensing chamber becomes pure water, and the tail water that salinity and high power concentrate then drops on the bottom of separation chamber; After tail water and the initial water inlet mixing circulation; Continue atomizing and be concentrated into saturation state, contained salt lease making heat exchange condensation post crystallization is separated out, and realizes that finally reverse osmosis concentrated water purification of water quality and salinity remove.This invention has changed the operation and the concentrated water treatment method thereof of existing reverse osmosis unit; Practice thrift water producing cost; Can significantly reduce the discharge capacity of the high strong brine of counter-infiltration generation; Reduce the negative effect that the strong brine discharging brings surrounding enviroment, be applicable to that the dense water of all kinds of counter-infiltration system institute output purifies.Technical scheme of the present invention is following:
A kind of method for spraying and desalting through residual pressure of reverse osmosis concentrated water is characterized in that being undertaken by following step:
1) waste water under high pressure is separated into dense water through reverse osmosis unit (1) with waste water;
2) this dense water is after heat-exchange system (2) preheating; Directly get into atomizing enriched chamber (4) through mixing interchanger (3); Utilize the energy in the dense water to pass through the pressure rotary atomizer; Water is sprayed into the front end of disk in the nozzle, and the disk that relies on rotation at a high speed is dense water generate film, the water droplets by the comprehensive function of " centrifugal force spraying " and " speed spraying ";
3) the dense water drop warp after the atomizing contacts with the thermal air current that temperature control heating system (5) was handled, and forms steam and is prepared into concentrated tail water;
4) take steam and air stream out of vaporization chamber by air-introduced machine (7) and get into gas powder separator (8), remove the salts substances powder of carrying secretly in the air, be condensed into fresh water and reclaim through condensate collector (9) again;
5) concentrate back tail water and get into tail water mixing system (11),, carry out feedback information through on-line monitoring to salinity and temperature: when salinity in the tail water near or when reaching capacity, tail water gets into crystallization tail water gatherer (10) crystallisation by cooling, the realization desalination; To the tail water that does not reach capacity, directly be back to mix interchanger (3) and dense water mix after entering enriched chamber (4) circulating and evaporating that atomizes again;
6) focus on after salt slag tailing entering salt slag tailing gatherer (12) storage that crystallization is separated out.
Method for spraying and desalting through residual pressure of reverse osmosis concentrated water of the present invention, wherein the hot-air of the temperature control heating system described in the step 3) is blown into the atomizing enriched chamber by air blast (6), and source of the gas can be air and low article vapours, and operating temperature is 50～100 ℃.
Method for spraying and desalting through residual pressure of reverse osmosis concentrated water of the present invention, wherein the waste water described in the step 1) refers to: industrial wastewater, waste water, seawater and bitter salt water that environmental pollution improvement produced.
Method for spraying and desalting through residual pressure of reverse osmosis concentrated water of the present invention, pressure was 1.5～20MPa when wherein the reverse osmosis unit described in the step 1) discharged.Method for spraying and desalting through residual pressure of reverse osmosis concentrated water of the present invention, wherein the salt slag tailing gatherer (12) described in the step 1) is to adopt corrosion resistant polytetrafluoroethylmaterial material to process the rectangular body structure of gatherer.
The inventive principle of method for spraying and desalting through residual pressure of reverse osmosis concentrated water of the present invention:
Counter-infiltration system utilize high pressure with water inlet be separated into the smart water of desalination and useless strong brine (hereinafter to be referred as: dense water), wherein dense water when membrane reactor discharges pressure up to 1.5～20MPa.The present invention should dense water after the heat-exchange system preheating, directly get into the atomizing enriched chamber, utilize energy in the dense water through the pressure type rotary atomizer, be vaporific and spray in the atomizing enriched chamber, and carry out the screw type orbiting motion.Atomizing simultaneously has circulation of air in the enriched chamber, and the water droplet volume that is suspended in the air-flow is very little, and diameter is generally in 100 μ m; Specific area is very big; Be convenient to carry out the heat transmission with surrounding air, the dense water drop after the atomizing is with after thermal air current contacts, and the moisture in dense water evaporation rapidly becomes steam; Oxidized or the volatilization of partial organic substances in the dense water, this dense water is thus by high power simmer down to tail water.After evaporation process finishes, take steam and air stream out of vaporization chamber entering gas powder separator, remove the salts substances powder of carrying secretly in the air, be condensed into fresh water and reclaim through heat-exchange system more subsequently by air-introduced machine.Concentrate back tail water and get into the tail water mixing system,, carry out feedback information and intelligent decision through on-line monitoring to salinity and temperature: when salinity in the tail water near or when reaching capacity, tail water will get into the heat-exchange system crystallisation by cooling, the realization desalination; To the tail water that does not reach capacity, directly be back to the mixing interchanger, after dense water carries out mixing of heat, energy and content of material, get into atomizing enriched chamber circulating and evaporating.Vapours is blown into the atomizing enriched chamber by air blast among the present invention; Source of the gas can be air and low article vapours, and operating temperature also can be according to actual needs generally at 50～90 ℃; In the temperature control heating system, improve intake air temperature, strengthen organic effect in desalination and the oxidize water.
The detailed step of method for spraying and desalting through residual pressure of reverse osmosis concentrated water of the present invention is following:
(1) according to required evaporated water, regulate become a mandarin gas flow and temperature, gas is fed the atomizing enriched chamber.
This operation is mainly carried out in air flow system, and air flow system is made up of air blast, temperature control heater, and source of the gas can be air and low article heat steam; Make gas get into the temperature control heater by air blast; This heater is according to actual conditions, with the operating temperature of the gas that becomes a mandarin generally at 50～90 ℃, also can be according to last processing requirements; The rising intake air temperature strengthens desalting efficiency and improves organic effect in the oxidation water smoke.After the gas that becomes a mandarin reaches temperature requirement, get into the atomizing enriched chamber, integral body is the motion of spiraling under doors structure and induced draft blower withdraws effect.
(2) with the dense water of counter-infiltration discharging through the heat-exchange system preheating.
This operating procedure mainly is in heat-exchange system, to carry out, and purpose is the temperature of dense water when improving atomizing, shortens the atomization and vaporization time.Heat-exchange system mainly is to carry out exchange heat between tail water and the reverse osmosis concentrated water with the water vapour after the atomizing, after concentrating, the heat transferred reverse osmosis concentrated water in the tail water with water vapour, after concentrating.Wherein the heat exchange between water vapour and dense water adopts embedded vapor-water heat exchanger to carry out, and tail water after concentrating and dense water then rely on heat exchange of heat pipe to realize the heat transmission.
(3) the dense water after the preheating is in the atomizing of atomizing enriched chamber.
This operates in the atomizing enriched chamber and carries out; Dense water at first gets into the pressure rotary atomizer, through this device, dense water is sprayed into the front end of disk in the nozzle; Rely on the disk that rotates at a high speed with dense water generate film, water droplets by the comprehensive function of " centrifugal force spraying " and " speed spraying "; It is narrower, more even that this device can make the atomized drop particle diameter distribute; Overbottom pressure when utilizing counter-infiltration to produce dense water with dense water smoke change into diameter at 100 μ m with interior water droplet; And it is sprayed in the air-flow of enriched chamber's inner top by swivel nozzle; Centrifugal action when water smoke relies on ejection is suspended in state motion in the shape of a spiral in the top stream of atomizing enriched chamber, and this movement locus has prolonged the time of drops of water fall down process, has improved the evaporation effect of water droplets simultaneously.
(4) dense water atomization drop mix with the air that becomes a mandarin contact, evaporation and concentration.
This process is carried out in the atomizing enriched chamber, and the air that becomes a mandarin flows with the backpitch state under the effect of inwall water conservancy diversion and blower fan drainage after getting into the atomizing enriched chamber; Constitute the motion structure that double helix streams with the dense water spray haze in top; Because the dense water droplet size of atomizing that is suspended in the air-flow is very little, specific area is very big, is convenient to carry out the heat transmission with the air that becomes a mandarin; Therefore the rapid evaporation of the moisture of the overwhelming majority becomes steam in the dense water; Form the tail water that tiny salt powder and high power concentrate, the salt dust that particle diameter is small swims in the air-flow, and the droplet after concentrating is deposited in the bottom formation tail water of enriched chamber.In addition, the contained oxidized and volatilization of organic matter of former dense water drop in the contact and evaporating process.
(5) dedusting of vapours and condensation.
After evaporation process finishes; Take steam in the step (4) and air stream out of vaporization chamber entering gas powder separator by air-introduced machine, remove the salts substances powder of carrying secretly in the air through separator, impurity such as salt powder can be used for warding off uses such as burner hearth, snow melt in winter after collecting; Mist after the purification gets into heat-exchange system; Rely on embedded vapor-water heat exchanger to realize the condensation of gas and the preheating of reverse osmosis concentrated water, steam is condensed into the light entering gatherer of water and reclaims, and other gases then enter air.
(6) regulation and control and the processing of concentrated tail water.
This process mainly is to carry out at tail water regulator control system, heat-exchange system and in mixing interchanger, can be divided into following three sub-steps:
1. concentrate the regulation and control of tail water.
The tail water that high power concentrates in the step (4) is by drainage to tail water mixing system; This system can carry out on-line testing and monitoring to salt concentration in the tail water and temperature, carries out intelligent decision according to the information of system feedback, during decision-making at first according to the tail water temperature; Solubility when salt is saturated under this temperature conditions of assessment tail water; Judge whether the tail water of entering system reaches or near saturated in conjunction with the salt content of being monitored, when salinity in the tail water near or when reaching capacity, tail water will be allocated to heat-exchange system; To the tail water that does not reach capacity, then directly with after dense water mixes, the entering enriched chamber's circulating and evaporating that atomizes again.
2. near or the condensation crystallization of the tail water that reaches capacity.
Saturated tail water is allocated to heat-exchange system; Realize preheating that initial dense water is discharged in counter-infiltration through heat exchanger tube; When temperature is reduced to the saturation solubility corresponding temperature that sets when following, tail water will be disposed to a large amount of condensation crystallizatioies in the gatherer, realize the secondary of salinity is removed.
3. the circulation of unsaturation tail water concentrates
Unsaturation tail water directly is back to the mixing interchanger, in mixing interchanger, realizes and the mixing of dense hydro-thermal amount, energy and content of material, get into the enriched chamber's circulating and evaporating that atomizes then again.
Spraying and desalting through residual pressure of reverse osmosis concentrated water effect comparison table 1
| Dense water index | Before the atomizing desalination | After the atomizing desalination | Method of testing | Standard label |
| COD | Concentration is not limit | ≤40 | Potassium dichromate method chlorine calibration method | GB/T?11914-1989 HJ/T70-2001 |
| BOD | Concentration is not limit | ≤5 | Dilution and inocalation method | GB7488-87 |
| TN | Concentration is not limit | ≤10 | Alkalescence potassium peroxydisulfate-clear up ultraviolet spectrophotometry | GB11894-89 |
| Ammonia nitrogen | Concentration is not limit | ≤5 | Distillation and titration | GB7478-87 |
| TP | Concentration is not limit | ≤0.5 | The ammonium molybdate AAS | GB11893-89 |
| Total salt quantity | Concentration is not limit | ≤1000 | The EDTA titration | GB?5750-1985 |
| Total hardness | Concentration is not limit | ≤200 | The EDTA titration | GB?5750-1985 |
| TDS | Concentration is not limit | ≤500 | Gravimetric method | GB?5750-1985 |
The present invention further discloses the application of method for spraying and desalting through residual pressure of reverse osmosis concentrated water aspect the useless strong brine of all kinds of counter-infiltration systems of preparation, do not receive the restriction of dense water water quality and reverse osmosis unit classification, and can unite use with other processing methods.Comprise the application of preparation separation industries waste water, waste water, seawater and bitter salt water aspect that environmental pollution improvement produced.
Technical characterstic and good effect that method for spraying and desalting through residual pressure of reverse osmosis concentrated water disclosed by the invention is compared with prior art had are:
(1) utilize the overbottom pressure of reverse osmosis concentrated water to atomize, save atomizing and use power, simple in structure, low cost of manufacture.
(2) do not receive the restriction of dense water water quality and reverse osmosis unit classification, process range is wide, is easy to realize and apply, and can realize coupling with traditional desalination method easily, improves the economic benefit of whole desalting process.
(3) unit scale is flexible, is convenient to disperse to use, and except that nozzle component, mostly operating pressure is normal pressure, and operating temperature uses Lowlevel thermal energy as the energy generally at 50～90 ℃ easily, macromolecular material making apparatus cheap and easy to get easy to use.
(4) in theory can be with the strong brine evaporation process more than 99%, the discharge capacity that is converted into fresh water and concentrated tail water is quite little, reduces second environmental pollution, and the salt slurry tail water of output can be used for industries such as chemical industry, building materials.
(5) gasification at liquid-vapor interface but not equipment wall surface carry out, so the fouling tendency of equipment is little, feed pretreatment requires low, easy and simple to handle, change and maintenance convenient.
Description of drawings
Accompanying drawing is a measurement mechanism structural representation provided by the invention.In the accompanying drawings, 1-reverse osmosis unit, 2-heat-exchange system, 3-mixing interchanger, 4-atomizing enriched chamber, 5-temperature control heating system, 6-air blast, 7-air-introduced machine, 8-powder gas separating device, 9-condensate collector, 10-crystallization tail water gatherer, 11-concentrate tail water mixing system, 12-salt slag tailing gatherer.
The specific embodiment
Following examples are with helping understand the present invention, and are not used in and also should be interpreted as the restriction to inventing in the listed claim by any way.
Embodiment 1
1) waste water under high pressure is separated into dense water through reverse osmosis unit (1) with waste water; Source of the gas (can be air and low article heat steam) gets into temperature control heater (5) by air blast (6); This heater is according to actual conditions such as the dense water yield of required evaporation and temperature; Make the gas that becomes a mandarin be controlled at general operation temperature (50～90 ℃), rely on air-introduced machine (7) swabbing action to get into the atomizing enriched chamber;
2) this dense water is through heat-exchange system (2) preheating, and heat-exchange system (2) mainly is to carry out exchange heat between tail water and the reverse osmosis concentrated water with the water vapour after the atomizing, after concentrating, the heat transferred reverse osmosis concentrated water in the tail water with water vapour, after concentrating.Wherein the heat exchange between water vapour and dense water adopts embedded vapor-water heat exchanger to carry out, and tail water after concentrating and dense water then rely on heat exchange of heat pipe to realize the heat transmission.
3) directly get into atomizing enriched chamber (4) through mixing interchanger (3); Utilize the energy in the dense water to pass through the pressure rotary atomizer; Water is sprayed into the front end of disk; Rely on the disk that rotates at a high speed with dense water generate film, water droplets by the comprehensive function of " centrifugal force spraying " and " speed spraying ";
4) the dense water drop warp after the atomizing contacts with the thermal air current that temperature control heating system (5) was handled; Under the effect of inwall water conservancy diversion and blower fan drainage, flow with the backpitch state; Constitute the motion structure that double helix streams with the dense water spray haze in top, form steam and be prepared into concentrated tail water;
5) take steam and air stream out of vaporization chamber by air-introduced machine (7) and get into gas powder separator (8), remove the salts substances powder of carrying secretly in the air, be condensed into fresh water and reclaim through condensate collector (9) again;
6) concentrate back tail water and get into tail water mixing system (11),, carry out feedback information through on-line monitoring to salinity and temperature: when salinity in the tail water near or when reaching capacity, tail water gets into crystallization tail water gatherer (10) crystallisation by cooling, the realization desalination; To the tail water that does not reach capacity, directly be back to mix interchanger (3) and dense water mix after entering enriched chamber (4) circulating and evaporating that atomizes again;
7) in the atomization and vaporization process, the salt slag tailing that crystallization is separated out gets into and focuses on after salt slag tailing gatherer (12) stores.
Embodiment 2
1) waste water is separated into smart water of desalination and useless strong brine (dense water) through reverse osmosis unit (1) with waste water under high pressure 2.5MPa;
2) this dense water directly gets into atomizing enriched chamber (4) through mixing interchanger (3) after heat-exchange system (2) preheating (40 ℃), utilizes the energy in the dense water to pass through improved pressure type rotary atomizer;
3) the dense water drop warp after the atomizing contacts with the thermal air current that temperature control heating system (90 ℃) was handled, and forms steam and is prepared into concentrated tail water;
4) take steam and air stream out of vaporization chamber by air-introduced machine (7) and get into gas powder separator (8), remove the salts substances powder of carrying secretly in the air, be condensed into fresh water and reclaim through condensate collector (9) again;
5) concentrate back tail water and get into tail water mixing system (11),, carry out feedback information through on-line monitoring to salinity and temperature: when salinity in the tail water near or when reaching capacity, tail water gets into crystallization tail water gatherer (10) crystallisation by cooling, the realization desalination; To the tail water that does not reach capacity, directly be back to mix interchanger (3) and dense water mix after entering enriched chamber (4) circulating and evaporating that atomizes again;
6) in the atomization and vaporization process, the salt slag tailing that crystallization is separated out gets into and focuses on after gatherer stores.
Embodiment 3
1) waste water is separated into smart water of desalination and useless strong brine (dense water) through reverse osmosis unit (1) with waste water under high pressure 7MPa;
2) this dense water directly gets into atomizing enriched chamber (4) through mixing interchanger (3) after heat-exchange system (2) preheating (40 ℃), utilizes the energy in the dense water to pass through improved pressure type rotary atomizer;
3) the dense water drop warp after the atomizing contacts with temperature control heating system (90 ℃) processed dry thermal air current, forms steam and is prepared into concentrated tail water;
4) take steam and air stream out of vaporization chamber by air-introduced machine (7) and get into gas powder separator (8), remove the salts substances powder art of carrying secretly in the air, be condensed into fresh water and reclaim through condensate collector (9) again;
5) concentrate back tail water and get into tail water mixing system (11),, carry out feedback information through on-line monitoring to salinity and temperature: when salinity in the tail water near or when reaching capacity, tail water gets into crystallization tail water gatherer (10) crystallisation by cooling, the realization desalination; To the tail water that does not reach capacity, directly be back to mix interchanger (3) and dense water mix after entering enriched chamber (4) circulating and evaporating that atomizes again;
6) in the atomization and vaporization process, the salt slag tailing that crystallization is separated out gets into and focuses on after gatherer stores.
Embodiment 4 (steel wastewater regenerating and recycling instance)
Certain iron and steel group internal does not have conventional resource of water supply; Therefore taking multi-water resources such as factory effluent, sanitary sewage and rainwater the method with regeneration of focusing on is that enterprise provides to produce and uses recirculated water and supplementing water; Waste water gets into counter-infiltration (RO) system after materialization processing, biochemical treatment and micro-filtration are handled, the high strong brine that is produced is handled through system of the present invention as follows:
1) waste water is separated into smart water of desalination and useless strong brine (dense water) through reverse osmosis unit (1) under the high pressure of 1.6MPa, and dense water discharge pressure reaches about 1.54Mpa;
2) this dense water gets into heat-exchange system (2); Tail water with water vapour after the atomizing, after concentrating carries out exchange heat; Water vapour with concentrate after tail water with the heat transferred reverse osmosis concentrated water, through after the preheating to 50 ℃ about, directly get into the enriched chamber (4) that atomizes through mixing interchanger (3); Utilize the complementary energy of dense water self, atomize through the pressure type rotary atomizer;
3) the dense water drop warp after the atomizing contacts with temperature control heating system (90 ℃) processed dry thermal air current, forms steam and is prepared into concentrated tail water;
4) take steam and air stream out of vaporization chamber by air-introduced machine (7) and get into gas powder separator (8), remove the salts substances powder of carrying secretly in the air, be condensed into fresh water and reclaim through condensate collector (9) again;
5) concentrate back tail water and get into tail water mixing system (11),, carry out feedback information through on-line monitoring to salinity and temperature: when salinity in the tail water near or when reaching capacity, tail water gets into crystallization tail water gatherer (10) crystallisation by cooling, the realization desalination; To the tail water that does not reach capacity, directly be back to mix interchanger (3) and dense water mix after entering enriched chamber (4) circulating and evaporating that atomizes again;
6) in the atomization and vaporization process, the salt slag tailing that crystallization is separated out gets into and focuses on after gatherer stores;
7) water quality of dense water and atomizing processing gained fresh water is seen table 2
The dense water of steel wastewater gained after counter-infiltration is through spraying and desalting through residual pressure effect comparison table 2
| Dense water index | Before the atomizing desalination | After the atomizing desalination | Method of testing | Standard label |
| COD | 214 | 38.5 | Potassium dichromate method chlorine calibration method | GB/T?11914-1989 HJ/T70-2001 |
| BOD | 10.1 | 4.2 | Dilution and inocalation method | GB7488-87 |
| TN | 28.5 | 9 | Alkalescence potassium peroxydisulfate-clear up ultraviolet spectrophotometry | GB11894-89 |
| Ammonia nitrogen | 1.23 | 0.95 | Distillation and titration | GB7478-87 |
| TP | 1.32 | 0.4 | The ammonium molybdate AAS | GB11893-89 |
| Total salt quantity | 9580 | 458 | The EDTA titration | GB?5750-1985 |
| Total hardness | 1448 | 150 | The EDTA titration | GB?5750-1985 |
| TDS | 9320 | 450 | Gravimetric method | GB?5750-1985 |
After the preferred embodiment that specifies; Being familiar with this technological personage can be well understood to; Do not break away from above-mentioned claim with spirit under can carry out various variations and modification; All foundations technical spirit of the present invention is done any simple modification, equivalent variations and modification to above embodiment, all belongs to the scope of technical scheme of the present invention.And the present invention does not also receive the restriction of the embodiment that gives an actual example in the specification.
Claims (5)
1. method for spraying and desalting through residual pressure of reverse osmosis concentrated water is characterized in that being undertaken by following step:
1) waste water under high pressure is separated into dense water through reverse osmosis unit (1) with waste water; Wherein dense water pressure when membrane reactor discharges is 1.5～20Mpa;
2) this dense water is after heat-exchange system (2) preheating; Directly get into atomizing enriched chamber (4) through mixing interchanger (3); Utilize the energy in the dense water to pass through the pressure rotary atomizer; Dense water is sprayed into the front end of disk in the nozzle, and the disk that relies on rotation at a high speed is dense water generate film, the dense water drop that atomizes by the comprehensive function of " centrifugal force spraying " and " speed spraying ";
3) the dense water drop warp after the atomizing contacts with the thermal air current that temperature control heating system (5) was handled, and is prepared into concentrated tail water;
4) take steam and air stream out of the atomizing enriched chamber by air-introduced machine (7) and get into gas powder separator (8), remove the salts substances powder of carrying secretly in the air, be condensed into fresh water and reclaim through condensate collector (9) again;
5) concentrate tail water and get into tail water mixing system (11),, carry out feedback information through on-line monitoring to salinity and temperature: when salinity in the tail water near or when reaching capacity, tail water gets into crystallization tail water gatherer (10) crystallisation by cooling, the realization desalination; To the tail water that does not reach capacity, directly be back to mix interchanger (3) and dense water mix after entering enriched chamber (4) circulating and evaporating that atomizes again;
6) focus on after salt slag tailing entering salt slag tailing gatherer (12) storage that crystallization is separated out.
2. the described method for spraying and desalting through residual pressure of reverse osmosis concentrated water of claim 1, wherein the hot-air of the temperature control heating system described in the step 3) is blown into the atomizing enriched chamber by air blast (6), and source of the gas is air and low article vapours, and operating temperature is 50～100 ℃.
3. the described method for spraying and desalting through residual pressure of reverse osmosis concentrated water of claim 1, wherein the waste water described in the step 1) refers to: the waste water that environmental pollution improvement produced, seawater and bitter salt water.
4. the described method for spraying and desalting through residual pressure of reverse osmosis concentrated water of claim 1, wherein pressure is 1.5～20MPa during the discharging of the reverse osmosis unit described in the step 1).
5. the described method for spraying and desalting through residual pressure of reverse osmosis concentrated water of claim 1, wherein the salt slag tailing gatherer (12) described in the step 6) is to adopt corrosion resistant polytetrafluoroethylmaterial material to process the rectangular body structure of gatherer.
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| CN101991079B (en) * | 2010-10-28 | 2012-07-04 | 陈锦权 | Method for reducing salt content of salt containing condiment |
| CN102139982B (en) * | 2011-01-31 | 2013-07-10 | 陆一心 | Water purification and regeneration device based on rotary spray evaporation and application of device |
| WO2014071610A1 (en) * | 2012-11-09 | 2014-05-15 | General Electric Company | Electrodialysis based brine treatment |
| EP3002259A4 (en) | 2013-07-05 | 2016-08-03 | Mitsubishi Heavy Ind Ltd | Water treatment method, and water treatment system |
| CN103342431B (en) * | 2013-07-23 | 2015-02-18 | 南京工业大学 | Papermaking pulping tail water recycling process |
| CN103708570A (en) * | 2013-12-27 | 2014-04-09 | 天津城建大学 | Method for recycling inorganic salts in inorganic pigment waste water |
| CN103818976B (en) * | 2014-02-14 | 2015-09-02 | 北京运特科技有限公司 | Direct-fired method for spraying and desalting and device |
| CN104773777B (en) * | 2015-03-27 | 2017-01-04 | 张喆 | A kind of method and apparatus of high strong brine evaporative crystallization |
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| CN106495264A (en) * | 2016-11-21 | 2017-03-15 | 张震霖 | A kind of nanocrystal vaporizer and reverse osmosis concentrated salt water treating system |
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| CN113772884B (en) * | 2021-09-03 | 2022-12-13 | 西安交通大学 | Coking wastewater treatment system and method |
| CN115490382B (en) * | 2022-09-19 | 2023-08-15 | 自然资源部天津海水淡化与综合利用研究所 | Preparation method of deep sea crystal |
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