CN107235597A - A kind of nonhomogen-ous nucleation crystallisation handles the method and system of desulfurization wastewater - Google Patents
A kind of nonhomogen-ous nucleation crystallisation handles the method and system of desulfurization wastewater Download PDFInfo
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- CN107235597A CN107235597A CN201710527538.1A CN201710527538A CN107235597A CN 107235597 A CN107235597 A CN 107235597A CN 201710527538 A CN201710527538 A CN 201710527538A CN 107235597 A CN107235597 A CN 107235597A
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- desulfurization wastewater
- nonhomogen
- crystallite
- enrichment facility
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/481—Treatment of water, waste water, or sewage with magnetic or electric fields using permanent magnets
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- 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
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
A kind of nonhomogen-ous nucleation crystallisation handles the method and system of desulfurization wastewater, comprises the following steps：1) desulfurization wastewater is sent into two stage cycle formula enrichment facility, the minimizing for realizing desulfurization wastewater 75% using heating agent and desulfurization wastewater reflux type is concentrated；2) concentrated water after minimizing is sent into crystallite case, the magnetic field effect discharged using permanent magnet in casing promotes the dissolubility salinity in concentrated water to form largely active suspension crystallite；3) suspension crystallite enters in last crystallization reactor with water, and nucleus is formed under the induction of crystal seed, crystal salt is quickly formed；4) solid salt is isolated by automatic flat-plate scraper centrifugal machine.The technique uses the principle that nonhomogen-ous nucleation is crystallized, accelerate the crystallization precipitation process of dissolubility salinity in desulfurization wastewater, system is final without waste water residual, separate out salinity and be discharged into cement building material curing system, at utmost realize the zero-emission of desulfurization wastewater, the recycling of comprehensive resources is improved, to promoting Green Development to serve positive role.
Description
Technical field
The present invention relates to power plant's wet desulphurization waste water treatment field, more particularly to a kind of nonhomogen-ous nucleation crystallisation processing is de-
The method and system of sulphur waste water.
Background technology
Under the strict environmental requirement of minimum discharge, power plant of the country generally ensures stable high using wet desulfurization system at present
The coal-burning boiler discharged gas fume sulphur oxide removal efficiency of effect.Wet desulfurization system produces a small amount of de- in continuous running
Sulphur waste water.Desulfurization wastewater mainly has following characteristics：Desulfurization wastewater is in acidity, typically in 5-6.5；Heavy metal ion in desulfurization wastewater
Content is not high, but ionic species is more (Pb, Hg, Ni, Fe, Al, As, Cd, Se, Cr, Cu etc.)；Containing substantial amounts of in desulfurization wastewater
Cl-(concentration is more than 10000ppm), has stronger corrosivity to desulphurization system pipeline and body steel construction；Hardness is big, Ca and Mg
Content it is high.These features are all the design emphasis of desulfurization wastewater resolution, wherein, the acidity of desulfurization wastewater can pass through acid
Alkali lye regulation pH is solved, and metal ion and Ca, Mg hardness can be solved by chemical settling, have Cl only-It is good molten with it
Solution property is difficult to be separated from desulfurization wastewater, thus the difficult point administered as desulfurization wastewater.The improvement master of current desulfurization wastewater
There are three header techniques, MVR technologies, infiltration embrane method, flue evaporation technique etc., but have that process equipment is cumbersome, floor space is big,
Zero-emission or the low defect for the treatment of effect can not be fully achieved.
The content of the invention
To overcome problems of the prior art, given up the invention provides a kind of processing desulfurization of nonhomogen-ous nucleation crystallisation
The technique of water, with nonhomogen-ous nucleation crystallization principle, using the induction of crystal seed accelerate in desulfurization wastewater using chlorion for main the moon from
Son and with the crystallization precipitation process for the dissolubility salinity of dominant cation such as Ca, Mg, Fe, Na, by the salinity in desulfurization wastewater
Solid salt recovery is changed into, the zero-emission of desulfurization wastewater is realized.System equipment is simple, and quantity is few, and automaticity is high.
The invention provides a kind of method that nonhomogen-ous nucleation crystallisation handles desulfurization wastewater, it is characterized in that, including it is as follows
Step：
1) desulfurization wastewater is circulated and concentrated by, and heating agent and desulfurization wastewater are carried out in reverse-flow heat exchange, desulfurization wastewater
Moisture evaporation is taken away with heating agent, the concentration of desulfurization wastewater decrement；
2) in the desulfurization wastewater feeding crystallite case after concentrates decrement, it is furnished with permanent magnet in crystallite box body, permanent magnet is released
The magnetic field effect of releasing promotes the dissolubility salinity in desulfurization wastewater to vibrate, the collision probability between increase molecule, ion, promotes
Dissolubility salinity is condensed into crystallite state in desulfurization wastewater；
3) sends into the crystallite state desulfurization wastewater of crystallite case in crystallization reactor, crystallization is added in crystallization reactor brilliant
Kind, under the induction of crystalline seed, the crystallite state dissolubility salinity in desulfurization wastewater quickly forms nucleus and gradually grows into tool
There is the salinity crystal of stable crystal form, complete nonhomogen-ous nucleation crystallization process, the salt slurry that crystallization reactor timing discharge is produced；
4) salt slurry is carried out centrifugal dehydration, solid salt moisture content≤3% after control centrifugation by.
Further, step 1) in decrement concentration realize altogether 75% decrement.
The system that a kind of nonhomogen-ous nucleation crystallisation handles desulfurization wastewater, can be achieved the processing desulfurization of nonhomogen-ous nucleation crystallisation
The method of waste water, including primary cycle formula enrichment facility, secondary cycle formula enrichment facility, crystallite case, crystallization reactor and automatic
Flat scraper centrifuge；The discharging opening of the primary cycle formula enrichment facility connects with the charging aperture of secondary cycle formula enrichment facility
Logical, the discharging opening of the secondary cycle formula enrichment facility is connected with the charging aperture of crystallite case with the charging of crystallization reactor, described
The charging aperture of crystallization reactor is connected with the charging aperture of automatic flat-plate scraper centrifugal machine.
Further, it is characterized in that, desulfurization wastewater leads to again after the decrement that primary cycle formula enrichment facility realizes 50%
Cross and realize that desulfurization is given up after pump squeezes into the decrement that secondary cycle formula enrichment facility realizes 50%, the evaporation and concentration by two-stage heat exchange
The decrement of water 75%.
Further, it is characterized in that, the circulating enrichment facility realizes desulfurization wastewater and heating agent using spray mode
Counter-flow heat exchange, spray uses hollow cone nozzles, and spray angle is 100 °, coverage rate >=200%.
Further, it is characterized in that, the circulating enrichment facility use circulating Continuous Heat Transfer process, by online
The ion concentration for monitoring desulfurization wastewater controls the cycle-index of desulfurization wastewater.
Further, it is characterized in that, it is further comprising the steps of：The disembark centrifugate of generation of automatic flat-plate scraper is transported to
It is collected in wastewater storage tank, centrifugate in wastewater storage tank sends into circulating enrichment facility, and to proceed heat exchange, decrement dense
Contracting.
Further, it is characterized in that, in addition to automatic flushing device, automatic cleaning is installed on crystallization reactor, periodically
Rinse the attachment of reactor wall.
Further, it is furnished with permanent magnet and agitator in the casing of crystallite case.
To sum up, above-mentioned technical proposal of the invention has the beneficial effect that：
The external zero-emission desulfurization wastewater of domestic power plant's wet desulfurization system can be realized.By crystal seed trigger it is heterogeneous into
Crystalline nucleation process is separated the soluble organic fraction in desulfurization wastewater, and is transferred to cement building material curing system progress recovery profit
With.
The circulating enrichment facility that the present invention is used can reuse the flue before desulfurization, also can carry out newly-built dress according to place
Match somebody with somebody, flexibly and easily.
The present invention uses the weary heat of plant area, for example：Flue gas or steam before desulfurization, it is not necessary to purchase new heating agent, pole
The realization energy-conservation of big degree.
The present invention can design and installation in wet desulfurization system gas approach front end, can be achieved desulfurization inlet flue gas is shifted to an earlier date
Cooling and dedusting, reduce the Design cooling load and operating load of wet desulfurization system.
The practicable full-automatic operation of present system, a small amount of centrifugate that end centrifuge is isolated reenters circulation
Formula enrichment facility, carries out circular treatment, finally without any waste discharge system, complete greenization ending, social environment benefit and
Business Economic Benefit is protruded.
Brief description of the drawings
Fig. 1 is the structural representation that nonhomogen-ous nucleation crystallisation of the present invention handles desulfurization wastewater.
In figure：
1. primary cycle formula enrichment facility, 2. secondary cycle formula enrichment facilities, 3. crystallite casees, 4. crystallization reactors, 5. certainly
Dynamic flat scraper centrifuge, 6. wastewater storage tanks, 7. primary cycle formula enrichment facility circulating lines, 8. primary cycle formula enrichment facilities
Heating agent entrance, 9. primary cycle formula enrichment facility concentrated water collection buckets, the outlet of 10. primary cycle formula enrichment facility heating agents, 11. 2 grades
Circulating enrichment facility circulating line, 12. secondary cycle formula enrichment facility heating agent entrances, 13. secondary cycle formula enrichment facilities are dense
Water collection bucket, the outlet of 14. secondary cycle formula enrichment facility heating agents, 15. one-level concentrated water delivery pumps, 16. 2 grades of concentrated water delivery pumps,
17. crystallite liquid delivery pump, 18. automatic flushing devices, 19. saline solution delivery pumps, 20. centrifugate delivery pumps, 21. waste water delivery pumps.
Embodiment
Embodiments of the present invention and principle are described in detail below in conjunction with accompanying drawing 1, illustrated embodiment is only used for solution
The present invention is released, protection scope of the present invention is not limited with this.
The method that this kind of nonhomogen-ous nucleation crystallisation handles desulfurization wastewater, comprises the following steps：
1) desulfurization wastewater is circulated and concentrated by, and heating agent is used as using weary hot (flue gas before steam or desulphurization system) of plant area
The moisture evaporation in reverse-flow heat exchange, desulfurization wastewater is carried out with desulfurization wastewater to take away with heating agent, the concentration of desulfurization wastewater decrement
Up to 75% (weight).
2) in the desulfurization wastewater feeding crystallite case after concentrates decrement, it is furnished with permanent magnet and agitator in crystallite box body,
The magnetic field effect that permanent magnet is discharged promotes the dissolubility salinity in desulfurization wastewater to vibrate, at the same using agitator increase molecule,
Collision probability between ion, promotes dissolubility salinity in desulfurization wastewater to be condensed into crystallite state.
3) sends into the crystallite state desulfurization wastewater of crystallite case in crystallization reactor, crystallization is added in crystallization reactor brilliant
Kind, under the induction of crystalline seed, the crystallite state dissolubility salinity in desulfurization wastewater quickly forms nucleus and gradually grows into tool
There is the salinity crystal of stable crystal form, complete nonhomogen-ous nucleation crystallization process, the salt slurry that crystallization reactor timing discharge is produced.
4) salt slurry is sent into automatic flat-plate scraper centrifugal machine and carries out centrifugal dehydration, the solid salt moisture content after control centrifugation by
≤ 3%.Solid salt incorporation cement is used for building materials curing system, refuse reclamation is realized.
As shown in figure 1, the technique and system of nonhomogen-ous nucleation crystallisation processing desulfurization wastewater described in present embodiment include
Primary cycle formula enrichment facility 1, secondary cycle formula enrichment facility 2, crystallite case 3, crystallization reactor 4 and the centrifugation of automatic flat-plate scraper
The several majors such as machine 5.The desulfurization wastewater that wet desulfurization system is continuously discharged delivers into primary cycle formula enrichment facility 1, passes through
Primary cycle formula enrichment facility circulating line 7 and supporting nozzle from top spray and under, and from circulating enrichment facility bottom
Primary cycle formula enrichment facility heating agent entrance 8 enters the heating agent moved upwards and carries out countercurrent heat exchange, is steamed using the heat of heating agent
Hair spray and under desulfurization wastewater fine droplet, the vapor evaporated gone out with heating agent by primary cycle formula enrichment facility heating agent
Primary cycle formula of the desulfurization wastewater concentrated waters that mouth 10 enters after desulphurization system, evaporation and concentration in circulating enrichment facility bottom is concentrated
Device concentrated water collection bucket 9 is collected, and the minimizing for realizing desulfurization wastewater 50% by primary cycle formula enrichment facility is concentrated, dense
Remaining 50% concentrated water after contracting sends into secondary cycle formula enrichment facility 2, the concentration of secondary cycle formula by one-level concentrated water delivery pump 15
Device uses 50% decrement that one-level concentrated water is realized with primary cycle formula enrichment facility identical working method.Followed by two grades
Ring type enrichment facility circulating line 11 and supporting nozzle from top spray and under, with secondary cycle formula enrichment facility heating agent entrance
12, which enter the heating agent that moves upwards, carries out countercurrent heat exchange, using the heat of vaporization spray of heating agent under the small liquid of desulfurization wastewater
Drop, the vapor evaporated enters desulphurization system, residue 25% with heating agent by secondary cycle formula enrichment facility heating agent outlet 14
Concentrated water collect in secondary cycle formula enrichment facility concentrated water collection bucket 13, pass through two grades of concentrated water delivery pumps 16 and send into crystallite casees 3.
Desulfurization wastewater realizes totally 75% decrement by two stage cycle formula enrichment facility.
The crystallite case 3 is sealing type cistern, and casing is equipped with permanent magnet, liquid level gauge and agitator, during design hydraulic retention
Between be half an hour, concentrated water enter crystallite case after in the presence of agitator into flow regime in a balanced way, the magnetic that permanent magnet is discharged
Field-effect promotes the dissolubility salinity in concentrated water to carry out microscopic vibration, so as to collide cohesion, forms the crystallite state salinity of aggregation, treats
After the reaction completely of hydraulic retention half an hour, crystallization reactor 4 is sent into by crystallite liquid delivery pump 17.
The full-automatic operation of crystallization reactor 4, the design reaction time is half an hour, and design crystal seed feeding mode is every
1kg was added every 10 minutes, under the induction of crystal seed, the crystallite state salinity in concentrated water quickly forms nucleus and grown into stable
The salinity crystal of crystal formation, i.e. described saline solution.Crystallization reactor is furnished with automatic flushing device 18, and periodic flushing reactor is prevented
Fouling or salinity crystal excessively adhere to wall.Saline solution sends into automatic flat-plate scraper centrifugal machine 5 by saline solution delivery pump 19.
The automatic feed of automatic flat-plate scraper centrifugal machine 5, centrifugation, discharging and flushing, a work period are 30 minutes,
Discharge as solid salt, moisture content≤3%.Solid salt product incorporation cement building material system is solidified.Centrifugate passes through centrifugate
The feeding wastewater storage tank 6 of delivery pump 20 is stored.Wastewater storage tank 6 is sent into the concentration of primary cycle formula by waste water delivery pump 21 after being filled with and filled
Put and reenter the Zero discharging system.
The present invention can realize wastewater zero discharge for the improvement of desulfurization wastewater, and technological process is simple, automaticity is high,
Economy cost is relatively low, complies fully with the environmental requirement of Green Development and industrial minimum discharge.
Described above is only the better embodiment to the present invention, not makees any formal limitation to the present invention, all
It is, to any simple modification made for any of the above embodiments, equivalent variations and modification, to belong to this according to technical spirit of the invention
Invention scope of the claims.
Claims (9)
1. a kind of method that nonhomogen-ous nucleation crystallisation handles desulfurization wastewater, it is characterized in that, comprise the following steps：
1) desulfurization wastewater is circulated and concentrated by, and heating agent and desulfurization wastewater are carried out to the moisture in reverse-flow heat exchange, desulfurization wastewater
Evaporation is taken away with heating agent, the concentration of desulfurization wastewater decrement；
2) in the desulfurization wastewater feeding crystallite case after concentrates decrement, it is furnished with permanent magnet in crystallite box body, permanent magnet is discharged
Magnetic field effect promote the dissolubility salinity in desulfurization wastewater to vibrate, increase molecule, the collision probability between ion promote desulfurization
Dissolubility salinity is condensed into crystallite state in waste water；
3) sends into the crystallite state desulfurization wastewater of crystallite case in crystallization reactor, and crystalline seed is added in crystallization reactor,
Under the induction of crystalline seed, the crystallite state dissolubility salinity in desulfurization wastewater quickly forms nucleus and gradually grown into stable
The salinity crystal of crystal formation, completes nonhomogen-ous nucleation crystallization process, the salt slurry that crystallization reactor timing discharge is produced；
4) salt slurry is carried out centrifugal dehydration, solid salt moisture content≤3% after control centrifugation by.
2. the method that a kind of nonhomogen-ous nucleation crystallisation according to claim 1 handles desulfurization wastewater, it is characterized in that, step
1) 75% decrement is realized in decrement concentration altogether in.
3. the system that a kind of nonhomogen-ous nucleation crystallisation handles desulfurization wastewater, can be achieved described in claim 1 or 2 it is heterogeneous into
The method that crystalline nucleation method handles desulfurization wastewater, it is characterized in that, including primary cycle formula enrichment facility, secondary cycle formula concentration dress
Put, crystallite case, crystallization reactor and automatic flat-plate scraper centrifugal machine；The discharging opening of the primary cycle formula enrichment facility and two grades
The charging aperture connection of circulating enrichment facility, the discharging opening of the secondary cycle formula enrichment facility and the charging aperture and knot of crystallite case
The charging connection of brilliant reactor, the charging aperture of the crystallization reactor is connected with the charging aperture of automatic flat-plate scraper centrifugal machine.
4. the system that a kind of nonhomogen-ous nucleation crystallisation according to claim 3 handles desulfurization wastewater, it is characterized in that, desulfurization
Waste water is squeezed into secondary cycle formula enrichment facility by pump again after the decrement that primary cycle formula enrichment facility realizes 50% and realized
Desulfurization wastewater decrement 75% is realized after 50% decrement, the evaporation and concentration by two-stage heat exchange.
5. the system that a kind of nonhomogen-ous nucleation crystallisation according to claim 3 handles desulfurization wastewater, it is characterized in that, it is described
Circulating enrichment facility realizes the counter-flow heat exchange of desulfurization wastewater and heating agent using spray mode, and spray is using conical hollow spray
Mouth, spray angle is 100 °, coverage rate >=200%.
6. the system that a kind of nonhomogen-ous nucleation crystallisation according to claim 3 handles desulfurization wastewater, it is characterized in that, it is described
Circulating enrichment facility uses circulating Continuous Heat Transfer process, and desulfurization is controlled by the ion concentration for monitoring desulfurization wastewater on-line
The cycle-index of waste water.
7. the system that a kind of nonhomogen-ous nucleation crystallisation according to claim 3 handles desulfurization wastewater, it is characterized in that, also wrap
Include following steps：The disembark centrifugate of generation of automatic flat-plate scraper is transported in wastewater storage tank and is collected, in wastewater storage tank
Centrifugate send into circulating enrichment facility and proceed heat exchange, decrement concentration.
8. the system that a kind of nonhomogen-ous nucleation crystallisation according to claim 3 handles desulfurization wastewater, it is characterized in that, also wrap
Automatic flushing device is included, automatic cleaning is installed on crystallization reactor, the attachment of periodic flushing reactor wall.
9. the system that a kind of nonhomogen-ous nucleation crystallisation according to claim 3 handles desulfurization wastewater, it is characterized in that, crystallite
It is furnished with permanent magnet and agitator in the casing of case.
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| CN201710527538.1A CN107235597A (en) | 2017-06-30 | 2017-06-30 | A kind of nonhomogen-ous nucleation crystallisation handles the method and system of desulfurization wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109592814A (en) * | 2018-12-16 | 2019-04-09 | 金科环境股份有限公司 | The processing unit and method of strong brine containing high-concentration sulfuric acid calcium |
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