CN108483782A - A kind of the desulfurization wastewater Zero discharging system and method for humidification-dehumidifying and reverse osmosis combination - Google Patents
A kind of the desulfurization wastewater Zero discharging system and method for humidification-dehumidifying and reverse osmosis combination Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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Abstract
The invention discloses a kind of the desulfurization wastewater Zero discharging system and method for humidification dehumidifying and reverse osmosis combination, system includes pretreatment system, pretreated water melded system, the thickening-purification technology system and crystallisation solidification system of humidification dehumidifying and reverse osmosis combination.Thickening-purification technology system includes humidifier, dehumidifier, reverse osmosis machine, vapor compressor, expander and reverse osmosis (RO) pump；Dehumidifier bottom is equipped with the cold inlet for being passed through desulfurization wastewater pretreated water, and top is equipped with the hot inlet for being passed through hot steam, and bottom and top are also respectively equipped with dehumidified air outlet and thermal wastewater outlet respectively；Humidifier lower part is equipped with air inlet, and top is equipped with desulfurization wastewater inlet, and bottom and top are respectively equipped with desulfurization wastewater concentrated solution outlet, humidifying air outlet；The thermal wastewater outlet of dehumidifier is connected to the desulfurization wastewater inlet of humidifier, and the hot inlet of dehumidifier is sent into the humidifying air compression of humidifier；The desulfurization wastewater concentrate of humidifier enters reverse osmosis machine processing.
Description
Technical field
Present invention relates particularly to the desulfurization wastewater Zero discharging systems and method of a kind of humidification-dehumidifying and reverse osmosis combination.
Background technology
It is issued and implemented from State Environmental Protection Administration's on January 1st, 2004 in China《GB13223-2003 thermal power plants atmosphere pollution row
Put standard》Since, coal-burning power plant generally implements flue gas desulfurization, lime stone --- and gypsum wet desulfurization becomes main sulfur removal technology,
And generally use " three headers " technique (also referred to as three casees five medicines) processing desulfurization wastewater.
It promulgates within 2006《DL/T5046-2006 Waste Water From Fire Power Plant Treatment design technical regulations》Middle proposition " Ying You
First consider treatment for reuse, such as without reuse condition when, qualified discharge after should handling " and " when for dry ash humidification or grey field sprinkling, answer
Take measures prevention to relevant device, the issuable corrosion of medium and harmful effect " related request.The same year has issued thermoelectricity
Industry desulfurization wastewater professional standard《DL/T997-2006 thermal power plants Limestone-gypsum Wet Flue Gas Desulfurization Process waste water quality Con trolling index》.
Implement new environmental law on January 1st, 2015, environmental protection policy implementation dynamics is increased, proposed to discharge of wastewater of overall importance
It is required that.
On January 11st, 2017, Chinese Ministry of Environmental Protection printed and distributed again《Thermal power plant's pollution prevention technique policy》, encourage thermal power plant to realize useless
Water recycles not outer row, and desulfurization wastewater zero-emission is realized in reuse after desulfurization wastewater processing.
The high saliferous of desulfurization wastewater, high concentrtion, high rigidity, perchloride, high sulfate radical；Contain heavy metal, fluoride, vulcanization
Object, ammonia nitrogen, silicon, organic matter etc.；50 DEG C or so of water temperature；The a class of pollutant especially strictly controlled containing World Health Organization and China
Deng；And influenced by fire coal, sulfur removal technology water quality, desulfurizing agent etc., desulfurization waste water quality complicated component, regular fluctuation are very big.
In recent years, along with the increasingly prominent of environmental problem, new environmental protection policy is constantly promulgated, environmental protection policy implementation dynamics
It is increasingly enhanced, desulfurization wastewater is as the one kind the most complicated, reluctant of ingredient in the regular waste water in coal-burning power plant, depth
Qualified discharge (when possessing receiving water body) or reuse have become trend of the times after reason.
Existing system and method are difficult to realize desulfurization wastewater zero-emission.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide the de- of a kind of humidification-dehumidifying and reverse osmosis combination
Sulphur wastewater zero discharge system and method.
The above-mentioned purpose of the present invention is achieved by following technical solution：
A kind of desulfurization wastewater Zero discharging system of humidification-dehumidifying and reverse osmosis combination, including desulfurization wastewater pretreatment system,
Pretreated water melded system, the thickening-purification technology system and crystallisation solidification system of humidification-dehumidifying and reverse osmosis combination；
The desulfurization wastewater pretreatment system includes vacuum filter, flocculation tank, clarifying basin and mud pit, described pre-
Processing water softening system includes cyclic water tank, ultrafiltration system, nanofiltration system and crystallization settling tank；Wherein, the vacuum filter
Equipped with desulfurization wastewater entrance, the mud entrance being connected to mud pit, the water outlet and cake outlet being connected to flocculation tank；Institute
It states flocculation tank and is equipped with the water inlet being connected to vacuum filter and the water outlet being connected to clarifying basin；The clarifying basin is equipped with
The precipitation mud that the water inlet being connected to flocculation tank, the flocculation being connected to cyclic water tank are produced water out and be connected to mud pit
Outlet；The mud pit be equipped with the slurry outlet being connected to vacuum filter, the ultrafiltration concentrated water entrance that is connected to ultrafiltration system and
The mud entrance being connected to crystallization settling tank, cyclic water tank；The cyclic water tank is equipped with the flocculation production water being connected to clarifying basin and enters
Mouth, the supernatant entrance being connected to crystallization settling tank and the water outlet being connected to ultrafiltration system；Ultrafiltration system is equipped with and recirculated water
Water inlet, the ultrafiltration water out being connected to nanofiltration system and the ultrafiltration concentrated water being connected to the mud pit outlet of case connection；It is described to receive
Filter system is equipped with the water inlet being connected to ultrafiltration system, nanofiltration water out and the nanofiltration concentrated water outlet being connected to crystallization settling tank,
What the nanofiltration water out generated is desulfurization wastewater pretreated water；
The thickening-purification technology system of the humidification-dehumidifying and reverse osmosis combination includes humidifier, dehumidifier, reverse osmosis machine, heat
Vapour compression machine, expander and reverse osmosis (RO) pump；Wherein：Dehumidifier is a bubble column heat exchanger, and the bottom of bubble column is equipped with
Cold inlet for being passed through desulfurization wastewater pretreated water, the top of bubble column are equipped with the hot inlet for being passed through hot steam,
The side of bubble column sets condensation production water out, and bottom and top are also respectively equipped with dehumidified air outlet and are preheated through hot steam respectively
Thermal wastewater outlet；Humidifier is an airdistillation tower, and the lower part of airdistillation tower is equipped with air inlet, and top is equipped with desulfurization wastewater
Inlet, bottom and top are respectively equipped with desulfurization wastewater concentrated solution outlet, humidifying air outlet；Dehumidifier thermal wastewater outlet with
The desulfurization wastewater inlet of humidifier is connected to, the humidifying air of humidifier is mixed with hot steam in vapor compressor compress after
It is sent into the hot inlet of dehumidifier, the dehumidified air of dehumidifier exports expanded device and is connected to the air inlet of humidifier；Humidifier
Desulfurization wastewater concentrated solution outlet be equipped with and carry out reverse osmosis reverse osmosis (RO) for waste water to be pumped into reverse osmosis machine and pump, reverse osmosis machine
Equipped with reverse osmosis concentration outlet and reverse osmosis produced water out；
The crystallisation solidification system includes flue gas air admission unit, Waste water concentrating liquid feed liquor unit and fluidized crystallization drying tower,
And Waste water concentrating liquid heating unit；Wherein, the lower part of fluidized crystallization drying tower is equipped with air inlet, and bottom is equipped with crystallization collection cone
Bucket, top are exported equipped with wet flue gas；Tower body is internally provided with the transfer roller being made of inner barrel and outer barrel, and outer barrel is that both ends are fixed on tower body
Peripheral wall on wall is the tubular structure of mesh, and inner cylinder is rotatably connected on by two shaft end on tower body wall, inner barrel and outer barrel
Between space in be equipped with grain size be more than outer barrel mesh screen aperture sphere padding；The periphery wall of the inner cylinder is equipped with more sparge pipes
Road, each hydrojet pipeline are equipped with multiple atomizers, and the end face of a shaft end of inner cylinder is equipped with multiple and more hydrojet pipelines pair
The dispensing orifice answered, each dispensing orifice are connected to corresponding hydrojet pipeline, and the endface of the shaft end is additionally provided with one and is fixed on tower body wall
Distributing valve, end face close-fitting on distributing valve, the distributing valve be equipped with an inlet opening, as inner cylinder rotates, each distribution of shaft end
Hole is connected to the inlet opening successively；The periphery wall of the inner cylinder is additionally provided with for being stirred what sphere padding was stirred in rotation
Mix blade；The flue gas air admission unit includes the flue being connected to power plant flue collector, and flue gas enters tower from the air inlet of tower
Body；The Waste water concentrating liquid feed liquor unit includes Waste water concentrating liquid input duct, and one end of the pipeline is connected to the inlet opening,
The reverse osmosis concentration outlet of the other end and reverse osmosis machine；The Waste water concentrating liquid heating unit includes being set to Waste water concentrating liquid
Preheater in input duct, the preheated device heating of Waste water concentrating liquid enter in the transfer roller in tower body；The preheater also with stream
The wet flue gas outlet for changing crystallizing and drying tower, direct emission after the preheated device dehumidification by condensation of wet flue gas.
Further, vacuum filter is disc type filter；Flocculation tank is set equipped with flocculant concentration；Ultrafiltration
System uses the ultrafiltration membrane in 0.1 μm of aperture, nanofiltration system to use DK series Nano filtering composite membranes；Further include for for ultrafiltration system and
The cleaning unit that nanofiltration system is cleaned, the cleaning unit include purge tank, water pump, filter, instrument and meter and pipeline.
Further, the airdistillation tower and fluidized crystallization drying tower are respectively equipped with the air inlet at tower body air inlet
Modulating mechanism and set on tower body humidifying air outlet or wet flue gas exit outlet modulating mechanism；
The air inlet modulating mechanism include inlet gas distributed modulation device and it is multiple be set to inlet gas distributed modulation device under
Side is for the entrance guiding plate by horizontal gas flow guiding for uprush；The outlet modulating mechanism includes that exit gas distribution is adjusted
Device processed and multiple outlet deflectors above exit gas distributed modulation device for guiding uprush as horizontal gas flow；
The inlet gas distributed modulation device, exit gas distributed modulation device respectively include intermediate modulation axis body and are set to
Modulate the modulation blade of axis body surrounding；The centre of the modulation axis body of inlet gas distributed modulation device is cylinder, and both ends are semicircle
Sphere or cone；The modulation axis body of exit gas distributed modulation device is the cylinder that a lower end is semicircle sphere or cone；
The modulation blade is set to the lower end of cylinder, including multiple be in tilted layout is used in cylinder circumferential direction by vertical ascent gas
Stream is modulated into the blade of spinning updraft；
The exit gas distributed modulation device is located at the vertical direction of inlet gas distributed modulation device.
Further, the entrance guiding plate or outlet deflector respectively by horizontal segment, vertical section and by horizontal segment and
Vertical section connects the segmental arc composition of transition, and stirrup and outer stirrup are equidistant circumferentially fixed and be set in the modulation vanes
At the nearly lower end cone of the cylinder of gas distributed modulation device.
Further, the Waste water concentrating liquid heating unit of crystallisation solidification system further includes being set to Waste water concentrating liquid input duct
On heat exchanger, enter in the transfer roller in tower body after the preheating of Waste water concentrating liquid preheated device, heat exchanger heating；The heat exchanger is also
It is connected to the heat source heated for Waste water concentrating liquid.
Further, multiple filling layers layer is additionally provided in airdistillation tower, lower layer's filler uses random packing, upper layer filler to adopt
Unit volume specific surface area with structured packing, and every last layer filler is 1.25-2.5 times of its next layer of filler.
Further, the efficient plastic filler of scrubbing tower and/or Te Laruide ring fillers or function are selected in the random packing
The similar random packing of similar performance, the structured packing are selected similar regular similar in impulse type structured packing or functional performance
Filler.
Further, scraper plate of the outer tube inner wall bottom of transfer roller equipped with multiple raising sphere paddings grindings, collision efficiency.
Further, the reverse osmosis (RO) pump provides power by expander.
A kind of desulfurization wastewater Zero emission method using above-mentioned humidification-dehumidifying and reverse osmosis combined system, including walk as follows
Suddenly：
(1) it pre-processes and softens
Desulfurization wastewater is inputted into vacuum filter, filtrate is discharged into from water outlet in flocculation tank and flocculation tank
Flocculant occur flocculation reaction, precipitated subsequently into clarifying basin, the supernatant after precipitation from flocculation production water out enter
Cyclic water tank, the precipitation mud in clarifying basin enter mud pit by precipitating outlet；
Supernatant in cyclic water tank enters ultrafiltration system by water outlet, after ultrafiltration production water enters back into nanofiltration system filtering
Obtain nanofiltration production water；The ultrafiltration concentrated water of ultrafiltration system discharge enters mud pit, and the nanofiltration concentrated water of nanofiltration system discharge enters crystallization
Settling tank, the thickening-purification technology system that nanofiltration production water enters subsequent humidification-dehumidifying and reverse osmosis combination are concentrated；
(2) humidification-dehumidifying combines concentration with reverse osmosis
Above-mentioned nanofiltration production water (pretreatment and softening waste water) and hot steam heat and mass in dehumidifier, obtain thermal wastewater and
Dehumidified air；After the dehumidified air expanded device decompression, with thermal wastewater in humidifier heat and mass, obtain desulfurization wastewater concentration
Liquid and humidifying air；Desulfurization wastewater concentrate enters reverse osmosis machine through reverse osmosis (RO) pump and carries out reverse-osmosis treated, reverse osmosis produced water
Direct reuse, reverse osmosis concentrated liquid finally enter crystallisation solidification system and carry out curing process；Wherein, humidifying air exists with hot steam
In vapor compressor dehumidifier reuse is sent into after mixing compression；
(3) crystallisation solidification
The heat smoke introduced using power plant's flue collector enters as carrier gas from the air inlet of fluidized crystallization drying tower, transfer roller inner/outer tube
Between sphere padding blown into micro- floating fluidisation state；The Waste water concentrating liquid reheated after preheating or preheating, which is distributed to, to be arranged in
Atomizer on transfer roller inner cylinder, atomizing spray to sphere padding surface carry out heat and mass with heat smoke, and moisture is by heat smoke band
Walk to obtain wet saturated flue gas, the salinity in concentrate is hardened in fluidisation state sphere padding surface crystallization drying, with the rotation of inner cylinder
With the flowing of heat smoke, between salt lease making sphere padding grinding, collision fall off and sink to the crystallization receipts of bottom of tower through outer barrel mesh screen
Collect cone bucket, is condensed after the wet preheated device phase-change heat-exchange of saturated flue gas and form condensed water and remove wet flue gas, remove wet flue gas direct emission.
The present invention uses two kinds of thickening-purification technology technologies：Humidification-dehumidifying and reverse osmosis combination.In a system of the invention, have
Two circuits, an air humidification-loop dehumidification and a reverse osmosis circuit of liquid water：
Air humidification-loop dehumidification is described first.Air passes through the humidifier and dehumidifier that run at various pressures, pressure
Force difference is kept by thermal vapor compression machine (TVC) and expanding machine.The saturated moist air of humidifier is left by thermal vapor compression machine
(TVC) the high steam driving in.High pressure saturated moist air leaves thermal vapor compression machine (TVC) and enters dehumidifier (condensation
Device).Most of water condensation in saturated moist air, the lower air of humidity flow out into expanding machine from dehumidifier.Expansion
Machine generates mechanical output, and mechanical output is used to drive the anti-permeability pump of counter-infiltration system.Air is under lower pressure and temperature
It leaves expanding machine and enters humidifier.Therefore air humidification-dehumidifying is run in a closed cycle.
The reverse osmosis circuit running open of liquid water.Enter dehumidifier after desulfurization wastewater raw water is preprocessed and softening, it is cooling
The heat of absorption condensation process release while wet saturated air dehumidifying.Later, the pending waste water after heating enters humidifier
With air mass-and heat-transfer, and make air humidification be certain temperature wet saturated air.Waste water concentrating after air humidification concentrates
Liquid leaves humidifier and enters reverse osmosis (RO) and pumps.The pump is run using the energy in expanding machine, is carried out to Waste water concentrating liquid
Supercharging.High pressure waste water concentrate enters reverse osmosis membrane assembly, the production water direct reuse of reverse osmosis module production, generated concentrated water
For coal-burning power plant's dry ash slag damping or send to crystallisation solidification cell processing.
Compared with other traditional desulfurization wastewater thickening-purification technology systems, this system has the following advantages that：
Compared with mechanical compressor, it has higher efficiency and lower power consumption；It is humidified-removes with constant pressure or transformation
Wetting phase ratio.Compared with the mechanical compressor used in humidification-dehumidifying in different pressures, vapor compressor TVC it is cheap and
Need less maintenance；Compared with multistage thickening-purification technology system, this system has same or higher efficiency and identical or more
Low power consumption；Compared with multi-effect distilling technology, this system has same or higher efficiency, phase under optimal operating conditions
Same or lower power consumption；Especially when that can obtain relatively inexpensive high steam, this system can use higher temperatures
The steam of degree, without will produce high temperature concentrated water.
Description of the drawings
Fig. 1 is the structure diagram of humidification-dehumidifying and the desulfurization wastewater Zero discharging system of reverse osmosis combination；
Fig. 2 is the structure diagram of humidification-dehumidifying and the thickening-purification technology system of reverse osmosis combination；
Fig. 3 is the structure diagram of desulfurization wastewater pretreatment system and pretreated water melded system；
Fig. 4 is the structural schematic diagram of humidifier (airdistillation tower)；
Fig. 5 is the structural schematic diagram of crystallisation solidification system；
Fig. 6 is the structural schematic diagram of transfer roller；
Fig. 7 is the dispensing orifice end view and distributing valve structural schematic diagram of inner cylinder；
Fig. 8 is the structural schematic diagram of the end face opposite with dispensing orifice of inner cylinder；
Fig. 9 is the structural schematic diagram of inner cylinder and hydrojet pipeline, distributing valve；
Figure 10 is the structural schematic diagram of inlet gas distributed modulation device；
Figure 11 is the structural schematic diagram of the modulation blade of inlet gas distributed modulation device；
Figure 12 is the structural schematic diagram of inlet gas distributed modulation device and entrance guiding plate；
Figure 13 is exit gas distributed modulation device and exports the structural schematic diagram of deflector；
Wherein, 21- entrance guidings plate, 22- export deflector, and 23- modulates axis body, 24- blades, stirrup in 25-, outside 26-
Stirrup, 31- inner cylinders, 32- outer barrels, 33- sphere paddings, 34- hydrojet pipelines, 35- atomizers, 36- dispensing orifices, 37- distributing valves,
38- inlet openings, 39- stir blade, 40- scraper plates, and 41- is connected to the pipeline of hydrojet pipeline and dispensing orifice, 42- desulfurization wastewater concentrates
Entrance, 43- stir blade.
Specific implementation mode
It is specific with reference to the accompanying drawings and examples to introduce essentiality content of the present invention, but the guarantor of the present invention is not limited with this
Protect range.
A kind of desulfurization wastewater Zero discharging system of humidification-dehumidifying and reverse osmosis combination as shown in Figure 1, including desulfurization wastewater
Pretreatment system, pretreated water melded system, the thickening-purification technology system and crystallisation solidification of humidification-dehumidifying and reverse osmosis combination
System.
As shown in figure 3, desulfurization wastewater pretreatment system includes vacuum filter, flocculation tank, clarifying basin and mud pit,
Pretreated water melded system includes cyclic water tank, ultrafiltration system, nanofiltration system and crystallization settling tank；Wherein, the vacuum filter
Machine is equipped with desulfurization wastewater entrance, the mud entrance being connected to mud pit, the water outlet and cake outlet being connected to flocculation tank；
The flocculation tank is equipped with the water inlet being connected to vacuum filter and the water outlet being connected to clarifying basin；The clarifying basin is set
The glar for producing water out and being connected to mud pit that flocculates for having the water inlet being connected to flocculation tank, being connected to cyclic water tank
Slurry outlet；The mud pit is equipped with the slurry outlet being connected to vacuum filter, the ultrafiltration concentrated water entrance being connected to ultrafiltration system
The mud entrance being connected to with crystallization settling tank, cyclic water tank；The cyclic water tank is equipped with the flocculation production water being connected to clarifying basin
Entrance, the supernatant entrance being connected to crystallization settling tank and the water outlet being connected to ultrafiltration system；Ultrafiltration system is equipped with and cycle
Water inlet, the ultrafiltration water out being connected to nanofiltration system and the ultrafiltration concentrated water being connected to the mud pit outlet of water tank connection；It is described
Nanofiltration system is equipped with the water inlet being connected to ultrafiltration system, nanofiltration water out and goes out with the nanofiltration concentrated water that settling tank is connected to is crystallized
Mouthful, what which generated is desulfurization wastewater pretreated water.Wherein, vacuum filter is disc type filter；
Flocculation tank is equipped with flocculant concentration equipment.Disc type filter acts on：1, it removes mainly solid in desulfurization wastewater
Shape particulate matter；2, mud cake can be equal with desulfurated plaster after being dehydrated disposes, and will not be included in dangerous waste；3, it is outstanding that desulfurization wastewater is greatly lowered
Float, flocculant can save 50% or more.Ultrafiltration system uses the ultrafiltration membrane in 0.1 μm of aperture.Using 0.1 μm of the ultrafiltration in aperture
Preposition pretreatment of the film group as nanofiltration system, can remove 0.1 μm and all of above substance, be mainly used for removing efficient flocculating production
Fine suspended solid, oil emulsion, colloid (silicon), clay etc. in water, effluent quality enters water water quality requirement better than nanofiltration system；Its is dense
Contracting liquid drains into mud pit, and water outlet enters water as nanofiltration system.Nanofiltration system uses DK series Nano filtering composite membranes.Using GE companies
The proprietary nanofiltration sandwich diaphragms of DK are a kind of technical grade equipment with high desalinization reusing sewage NF membranes, preferential to divalent and multivalent ion
Retention is related to the concentration of feed liquid and composition to the rejection size of monovalention.It is soft for desulfurization wastewater efficient flocculating production water
Change divides salt (desalination, hardness, 1nm and above other impurities etc.).Concentrate is sent into crystallization settling tank, and crystallization settling tank supernatant returns
It flow to cyclic water tank, crystallization mud enters mud pit, then is separated by solid-liquid separation to disc type vacuum hydroextractor.Nanofiltration advanced treating
Afterwards, can divalent and the multivalence salinity such as effectively catching calcium and magnesium, realize softening and divide salt.Nanofiltration production water further concentrates decrement, concentrates
Water fully recovering is produced after decrement, the nanofiltration production water after concentration decrement is desulfurization wastewater pretreated water, is used for end curing process.
Above-mentioned pretreatment system further includes cleaning unit.Ultrafiltration system and nanofiltration system are required for cleaning, cleaning unit include purge tank,
Water pump, medicament and chemicals dosing plant, filter, instrument and meter and pipeline etc., cleaning waste liquid are discharged into mud pit.Cleaning is divided into customary clear
It washes, maintainability cleans and restorative cleaning.1, customary cleaning：General recommendations, class Three's operation, per tour cleaning are primary；Split run is run,
Operation is cleaned primary after 7-10 hours.Customary cleaning agent selects film producer or the special sulfuric acid dirt cleaning agent of other producers, clearly
Washing method is cleaned with maintainability.2, when flux depression 10% or so and bad customary cleaning performance, maintainability is needed to clean,
Maintainability cleaning agent selects film producer or other specialized factory's medicaments.Cleaning method is as follows：Nanofiltration cleaning is carried out first：First use
10-30 points of water cleaning is produced in nanofiltration, and medicament is to intake direction wash cycles 10-30 points, later with 10-30 points of nanofiltration production water rinsing；
Cleaning pressure is required according to nanofiltration manufacturer.Repeatedly, until nanofiltration system membrane flux reaches design standard.Then ultrafiltration is carried out
Cleaning.Cleaning method is cleaned with nanofiltration.Underflow cleaning waste liquid is arranged after cleaning in time.Cleaning pressure is required according to ultrafiltration manufacturer.Such as
This repeatedly, until ultrafiltration system membrane flux reaches design standard.3, when flux depression 20% or so and maintainability cleaning performance
When bad, restorative cleaning, restorative cleaning agent is needed to select film producer or other specialized factory's medicaments.Cleaning method is such as
Under：Nanofiltration cleaning is carried out first：10-30 points first are cleaned with nanofiltration production water, medicament is divided with direction wash cycles 10-30 of intaking, it
Afterwards with 10-30 points of nanofiltration production water rinsing, cleaning pressure is required according to nanofiltration manufacturer.Repeatedly, until nanofiltration system membrane flux
Reach design standard.Then ultrafiltration cleaning is carried out.Cleaning method is cleaned with nanofiltration；Underflow cleaning waste liquid is arranged after cleaning in time.Clearly
Pressure is washed to be required according to ultrafiltration manufacturer.Repeatedly, until ultrafiltration system membrane flux reaches design standard.
As shown in Fig. 2, the thickening-purification technology system of humidification-dehumidifying and reverse osmosis combination include humidifier, it is dehumidifier, reverse osmosis
Machine, vapor compressor, expander and reverse osmosis (RO) pump；Wherein：Dehumidifier is a bubble column heat exchanger, the bottom of bubble column
Equipped with the cold inlet for being passed through desulfurization wastewater pretreated water, the top of bubble column is equipped with to enter for being passed through the hot-fluid of hot steam
Mouthful, the side of bubble column sets condensation production water out, and bottom and top are also respectively equipped with dehumidified air outlet and respectively through hot steam
The thermal wastewater of preheating exports；Humidifier is an airdistillation tower (as shown in Figure 4), and the lower part of airdistillation tower is equipped with air inlet,
Top is equipped with desulfurization wastewater inlet, and bottom and top are respectively equipped with desulfurization wastewater concentrated solution outlet, humidifying air outlet；Dehumidifying
The thermal wastewater outlet of device is connected to the desulfurization wastewater inlet of humidifier, and the humidifying air and hot steam of humidifier are in hot steam pressure
The hot inlet of dehumidifier is sent into contracting machine after mixing compression, the dehumidified air of dehumidifier exports expanded device decompression and humidifier
Air inlet connection；The desulfurization wastewater concentrated solution outlet of humidifier be equipped with for by waste water be pumped into reverse osmosis machine carry out it is reverse osmosis
Reverse osmosis (RO) pumps, and reverse osmosis machine is equipped with reverse osmosis concentration outlet and reverse osmosis produced water out.The reverse osmosis (RO) pump can be by swollen
Swollen device provides power.The packing layer of multi-layer lifting high heat transfer mass transfer effect can be equipped in airdistillation tower, lower layer's filler is using scattered
Heap filler, upper layer filler use structured packing, and are its next layer of fillers per the unit volume specific surface area of last layer filler
1.25-2.5 again；The efficient plastic filler of scrubbing tower and/or Te Laruide ring fillers or functional performance phase are selected in the random packing
Similar structured packing similar in impulse type structured packing or functional performance is selected in close similar random packing, the structured packing.
As shown in figure 5, crystallisation solidification system includes that flue gas air admission unit, Waste water concentrating liquid feed liquor unit and fluidized crystallization are dry
Dry tower and Waste water concentrating liquid heating unit；Wherein, the lower part of fluidized crystallization drying tower is equipped with air inlet, and bottom is equipped with crystallization
Cone bucket is collected, top is exported equipped with wet flue gas；Tower body is internally provided with the transfer roller (as Figure 6-9) being made of inner barrel and outer barrel,
Outer barrel is the tubular structure that the peripheral wall that both ends are fixed on tower body wall is mesh, and inner cylinder is rotatably connected on by two shaft end
The sphere padding that grain size is more than outer barrel mesh screen aperture is equipped on tower body wall, in the space between inner barrel and outer barrel；The inner cylinder
Periphery wall is equipped with more hydrojet pipelines, and each hydrojet pipeline is equipped with multiple atomizers, and the end face of a shaft end of inner cylinder is equipped with
Multiple dispensing orifices corresponding with more hydrojet pipelines, each dispensing orifice are connected to corresponding hydrojet pipeline, and the endface of the shaft end is also
It is fixed on distributing valve on tower body wall equipped with one, end face close-fitting is on distributing valve, which is equipped with an inlet opening, with interior
Cylinder rotation, each dispensing orifice of shaft end are connected to the inlet opening successively；The periphery wall of the inner cylinder be additionally provided with for rotation when pair
The stirring blade that sphere padding is stirred；The outer tube inner wall bottom of transfer roller is equipped with the grinding of multiple raising sphere paddings, collision effect
The scraper plate of rate；The flue gas air admission unit includes the flue being connected to power plant flue collector, heat smoke from the air inlet of tower into
Enter tower body；Waste water concentrating liquid feed liquor unit includes Waste water concentrating liquid input duct, and one end of the pipeline is connected to the inlet opening,
The reverse osmosis concentration outlet of the other end and reverse osmosis machine；Waste water concentrating liquid heating unit includes being set to Waste water concentrating liquid feed liquor
Preheater on pipeline, the preheated device heating of Waste water concentrating liquid enter in the transfer roller in tower body；The preheater is also tied with fluidisation
The wet flue gas outlet of brilliant drying tower, direct emission after the preheated device dehumidification by condensation of wet flue gas.Further, crystallisation solidification system
The Waste water concentrating liquid heating unit of system further includes the heat exchanger being set in Waste water concentrating liquid input duct, and Waste water concentrating liquid is preheated
Enter in the transfer roller in tower body after device preheating, heat exchanger heating；Heat exchanger also with heated for Waste water concentrating liquid heat source (hot water,
Steam or heat smoke) connection.
Wherein, the airdistillation tower and fluidized crystallization drying tower are respectively equipped with the modulation of the air inlet at tower body air inlet
Mechanism and set on tower body humidifying air outlet or wet flue gas exit outlet modulating mechanism (as shown in figures 10-13)；It is described into
Gas modulating mechanism includes that inlet gas distributed modulation device and multiple be set to below inlet gas distributed modulation device are used for horizontal gas
Stream guiding is the entrance guiding plate of uprush；The outlet modulating mechanism includes exit gas distributed modulation device and multiple is set to
For the outlet deflector by uprush guiding for horizontal gas flow above exit gas distributed modulation device；The inlet gas point
Cloth modulator, exit gas distributed modulation device respectively include intermediate modulation axis body and the modulation leaf set on modulation axis body surrounding
Piece；The centre of the modulation axis body of inlet gas distributed modulation device is cylinder, and both ends are semicircle sphere or cone；Exit gas
The modulation axis body of distributed modulation device is the cylinder that a lower end is semicircle sphere or cone；The modulation blade is set to cylinder
Lower end, including multiple be in tilted layout be used to vertical ascent air-flow being modulated into spinning updraft in cylinder circumferential direction
Blade；The exit gas distributed modulation device is located at the vertical direction of inlet gas distributed modulation device.Further, the entrance
Deflector or outlet deflector are respectively by horizontal segment, vertical section and the segmental arc group that horizontal segment is connected to transition with vertical section
At in the modulation vanes stirrup and outer stirrup be equidistantly circumferentially fixed and the cylinder that is set in gas distributed modulation device
At the cone of nearly lower end.
Desulfurization wastewater Zero emission method based on above-mentioned pretreatment system, including：
(1) it pre-processes and softens
Desulfurization wastewater is inputted into vacuum filter, filtrate is discharged into from water outlet in flocculation tank and flocculation tank
Flocculant occur flocculation reaction, precipitated subsequently into clarifying basin, the supernatant after precipitation from flocculation production water out enter
Cyclic water tank, the precipitation mud in clarifying basin enter mud pit by precipitating outlet；
Supernatant in cyclic water tank enters ultrafiltration system by water outlet, after ultrafiltration production water enters back into nanofiltration system filtering
Obtain nanofiltration production water；The ultrafiltration concentrated water of ultrafiltration system discharge enters mud pit, and the nanofiltration concentrated water of nanofiltration system discharge enters crystallization
Settling tank, the thickening-purification technology system that nanofiltration production water enters subsequent humidification-dehumidifying and reverse osmosis combination are concentrated；
Supernatant in crystallization settling tank enters cyclic water tank, and the mud for settling formation enters mud pit；
Mud in cyclic water tank enters mud pit；
Mud in mud pit enters vacuum filter, and filtrate is discharged into flocculation tank from water outlet.
Wherein, flocculant additive amount is 50mg-1.5g/L in flocculation tank；The mixing speed of flocculation reaction is 60r/
Min, reaction time 15-25min；Flocculant is stirred with waste water using quick hybrid technique before flocculation reaction, is stirred
Speed 100r/min, mixing time 2-5min.
The cleaning waste liquid that cleaning unit generates is discharged into mud pit.
(2) humidification-dehumidifying combines concentration with reverse osmosis
Above-mentioned nanofiltration production water (pretreatment and softening waste water) and hot steam heat and mass in dehumidifier, obtain thermal wastewater and
Dehumidified air；After the dehumidified air expanded device decompression, with thermal wastewater in humidifier heat and mass, obtain desulfurization wastewater concentration
Liquid and humidifying air；Desulfurization wastewater concentrate enters reverse osmosis machine through reverse osmosis (RO) pump and carries out reverse-osmosis treated, reverse osmosis produced water
Direct reuse, reverse osmosis concentrated liquid finally enter crystallisation solidification system and carry out curing process；Wherein, humidifying air exists with hot steam
In vapor compressor dehumidifier reuse is sent into after mixing compression；
(3) crystallisation solidification
The heat smoke introduced using power plant's flue collector enters as carrier gas from the air inlet of fluidized crystallization drying tower, transfer roller inner/outer tube
Between sphere padding blown into micro- floating fluidisation state；The Waste water concentrating liquid reheated after preheating or preheating, which is distributed to, to be arranged in
Atomizer on transfer roller inner cylinder, atomizing spray to sphere padding surface carry out heat and mass with heat smoke, and moisture is by heat smoke band
Walk to obtain wet saturated flue gas, the salinity in concentrate is hardened in fluidisation state sphere padding surface crystallization drying, with the rotation of inner cylinder
With the flowing of heat smoke, between salt lease making sphere padding grinding, collision fall off and sink to the crystallization receipts of bottom of tower through outer barrel mesh screen
Collect cone bucket, is condensed after the wet preheated device phase-change heat-exchange of saturated flue gas and form condensed water and remove wet flue gas, remove wet flue gas direct emission.
The effect of above-described embodiment is specifically to introduce the essentiality content of the present invention, but those skilled in the art should know
Protection scope of the present invention should not be confined to the specific embodiment by road.
Claims (10)
1. the desulfurization wastewater Zero discharging system of a kind of humidification-dehumidifying and reverse osmosis combination, it is characterised in that：It is pre- including desulfurization wastewater
The thickening-purification technology system and crystallisation solidification system of processing system, pretreated water melded system, humidification-dehumidifying with reverse osmosis combination
System；
The desulfurization wastewater pretreatment system includes vacuum filter, flocculation tank, clarifying basin and mud pit, the pretreatment
Water softening system includes cyclic water tank, ultrafiltration system, nanofiltration system and crystallization settling tank；Wherein, the vacuum filter is equipped with
Desulfurization wastewater entrance, the mud entrance being connected to mud pit, the water outlet and cake outlet being connected to flocculation tank；The wadding
Solidifying reaction tank is equipped with the water inlet being connected to vacuum filter and the water outlet being connected to clarifying basin；The clarifying basin is equipped with and wadding
Water inlet, the flocculation production water out being connected to cyclic water tank and the precipitation mud being connected to mud pit of solidifying reaction tank connection go out
Mouthful；The mud pit be equipped with the slurry outlet being connected to vacuum filter, the ultrafiltration concentrated water entrance that is connected to ultrafiltration system and with
Crystallize settling tank, the mud entrance that cyclic water tank is connected to；The cyclic water tank be equipped with the flocculation that be connected to clarifying basin produce water inlet,
The supernatant entrance being connected to crystallization settling tank and the water outlet being connected to ultrafiltration system；Ultrafiltration system is equipped with to be connected with cyclic water tank
Logical water inlet, the ultrafiltration water out being connected to nanofiltration system and the ultrafiltration concentrated water being connected to mud pit outlet；The nanofiltration system
System is equipped with the water inlet being connected to ultrafiltration system, nanofiltration water out and the nanofiltration concentrated water outlet being connected to crystallization settling tank, this is received
What filtered water outlet generated is desulfurization wastewater pretreated water；
The thickening-purification technology system of the humidification-dehumidifying and reverse osmosis combination includes humidifier, dehumidifier, reverse osmosis machine, hot steam
Compressor, expander and reverse osmosis (RO) pump；Wherein：Dehumidifier is a bubble column heat exchanger, and the bottom of bubble column, which is equipped with, to be used for
It is passed through the cold inlet of desulfurization wastewater pretreated water, the top of bubble column is equipped with the hot inlet for being passed through hot steam, bubble-cap
The side of tower sets condensation production water out, the heat that bottom and top are also respectively equipped with dehumidified air outlet and are preheated through hot steam respectively
Wastewater outlet；Humidifier is an airdistillation tower, and the lower part of airdistillation tower is equipped with air inlet, and top is equipped with desulfurization wastewater feed liquor
Mouthful, bottom and top are respectively equipped with desulfurization wastewater concentrated solution outlet, humidifying air outlet；The thermal wastewater outlet of dehumidifier and humidification
The desulfurization wastewater inlet of device is connected to, the humidifying air of humidifier is mixed with hot steam in vapor compressor compress after be sent into
The hot inlet of dehumidifier, the dehumidified air of dehumidifier export expanded device and are connected to the air inlet of humidifier；Humidifier takes off
The outlet of sulphur Waste water concentrating liquid is equipped with carries out reverse osmosis reverse osmosis (RO) pump for waste water to be pumped into reverse osmosis machine, and reverse osmosis machine is equipped with
Reverse osmosis concentration exports and reverse osmosis produced water out；
The crystallisation solidification system includes flue gas air admission unit, Waste water concentrating liquid feed liquor unit and fluidized crystallization drying tower, and
Waste water concentrating liquid heating unit；Wherein, the lower part of fluidized crystallization drying tower is equipped with air inlet, and bottom is equipped with crystallization and collects cone bucket,
Top is exported equipped with wet flue gas；Tower body is internally provided with the transfer roller being made of inner barrel and outer barrel, and outer barrel is that both ends are fixed on tower body wall
On peripheral wall be mesh tubular structure, inner cylinder is rotatably connected on by two shaft end on tower body wall, inner barrel and outer barrel it
Between space in be equipped with grain size be more than outer barrel mesh screen aperture sphere padding；The periphery wall of the inner cylinder is equipped with more sparge pipes
Road, each hydrojet pipeline are equipped with multiple atomizers, and the end face of a shaft end of inner cylinder is equipped with multiple and more hydrojet pipelines pair
The dispensing orifice answered, each dispensing orifice are connected to corresponding hydrojet pipeline, and the endface of the shaft end is additionally provided with one and is fixed on tower body wall
Distributing valve, end face close-fitting on distributing valve, the distributing valve be equipped with an inlet opening, as inner cylinder rotates, each distribution of shaft end
Hole is connected to the inlet opening successively；The periphery wall of the inner cylinder is additionally provided with for being stirred what sphere padding was stirred in rotation
Mix blade；The flue gas air admission unit includes the flue being connected to power plant flue collector, and flue gas enters tower from the air inlet of tower
Body；The Waste water concentrating liquid feed liquor unit includes Waste water concentrating liquid input duct, and one end of the pipeline is connected to the inlet opening,
The reverse osmosis concentration outlet of the other end and reverse osmosis machine；The Waste water concentrating liquid heating unit includes being set to Waste water concentrating liquid
Preheater in input duct, the preheated device heating of Waste water concentrating liquid enter in the transfer roller in tower body；The preheater also with stream
The wet flue gas outlet for changing crystallizing and drying tower, direct emission after the preheated device dehumidification by condensation of wet flue gas.
2. desulfurization wastewater Zero discharging system according to claim 1, it is characterised in that：Vacuum filter is disc type vacuum
Filter；Flocculation tank is set equipped with flocculant concentration；Ultrafiltration system uses the ultrafiltration membrane in 0.1 μm of aperture, nanofiltration system to use
DK series Nano filtering composite membranes；Further include the cleaning unit for being cleaned for ultrafiltration system and nanofiltration system, the cleaning unit
Including purge tank, water pump, filter, instrument and meter and pipeline.
3. desulfurization wastewater Zero discharging system according to claim 1, it is characterised in that：The airdistillation tower and fluidisation are tied
Brilliant drying tower is respectively equipped with the air inlet modulating mechanism at tower body air inlet and is set to the outlet of tower body humidifying air or wet flue gas
The outlet modulating mechanism in exit；
The air inlet modulating mechanism includes that inlet gas distributed modulation device and multiple be set to below inlet gas distributed modulation device are used
In the entrance guiding plate by horizontal gas flow guiding for uprush；The outlet modulating mechanism includes exit gas distributed modulation device
With multiple outlet deflectors above exit gas distributed modulation device for guiding uprush as horizontal gas flow；
The inlet gas distributed modulation device, exit gas distributed modulation device respectively include intermediate modulation axis body and set on modulation
The modulation blade of axis body surrounding；The centre of the modulation axis body of inlet gas distributed modulation device is cylinder, and both ends are semicircle sphere
Or cone；The modulation axis body of exit gas distributed modulation device is the cylinder that a lower end is semicircle sphere or cone；It is described
The lower end that blade is set to cylinder is modulated, including multiple be in tilted layout is used in cylinder circumferential direction by vertical ascent air-flow tune
The blade of spinning updraft is made；
The exit gas distributed modulation device is located at the vertical direction of inlet gas distributed modulation device.
4. desulfurization wastewater Zero discharging system according to claim 3, it is characterised in that：The entrance guiding plate or outlet guide
Horizontal segment is connected by horizontal segment, vertical section and with vertical section the segmental arc of transition and formed by flowing plate respectively, the modulation blade
At nearly lower end cone through the cylinder that interior stirrup and outer stirrup are equidistant circumferentially fixed and are set in gas distributed modulation device.
5. desulfurization wastewater Zero discharging system according to claim 1, it is characterised in that：The Waste water concentrating of crystallisation solidification system
Liquid heating unit further includes the heat exchanger being set in Waste water concentrating liquid input duct, the preheated device preheating of Waste water concentrating liquid, heat exchange
Enter in the transfer roller in tower body after device heating；The heat exchanger is also connected to the heat source heated for Waste water concentrating liquid.
6. desulfurization wastewater Zero discharging system according to claim 1, it is characterised in that：It is additionally provided with multilayer in airdistillation tower
Packing layer, lower layer's filler use random packing, and upper layer filler uses structured packing, and compares table per the unit volume of last layer filler
Area is 1.25-2.5 times of its next layer of filler.
7. desulfurization wastewater Zero discharging system according to claim 6, it is characterised in that：Scrubbing tower is selected in the random packing
Similar random packing similar in efficient plastic filler and/or Te Laruide ring fillers or functional performance, the structured packing are selected
Similar structured packing similar in impulse type structured packing or functional performance.
8. desulfurization wastewater Zero discharging system according to claim 1, it is characterised in that：The outer tube inner wall bottom of transfer roller is equipped with
It is multiple improve sphere paddings grinding, collision efficiency scraper plate.
9. desulfurization wastewater Zero discharging system according to claim 1, it is characterised in that：The reverse osmosis (RO) pump is by expander
Power is provided.
10. a kind of desulfurization wastewater Zero emission method using claim 1-9 any humidification-dehumidifying and reverse osmosis combined system,
It is characterised in that it includes following steps：
(1) it pre-processes and softens
Desulfurization wastewater is inputted into vacuum filter, filtrate is discharged into flocculation tank and the wadding in flocculation tank from water outlet
Flocculation reaction occurs for solidifying agent, is precipitated subsequently into clarifying basin, and the supernatant after precipitation enters cycle from flocculation production water out
Water tank, the precipitation mud in clarifying basin enter mud pit by precipitating outlet；
Supernatant in cyclic water tank enters ultrafiltration system by water outlet, and ultrafiltration production water obtains after entering back into nanofiltration system filtering
Water is produced in nanofiltration；The ultrafiltration concentrated water of ultrafiltration system discharge enters mud pit, and the nanofiltration concentrated water of nanofiltration system discharge enters crystallization sedimentation
Tank, the thickening-purification technology system that nanofiltration production water enters subsequent humidification-dehumidifying and reverse osmosis combination are concentrated；
(2) humidification-dehumidifying combines concentration with reverse osmosis
Above-mentioned nanofiltration production water (pretreatment and softening waste water) and hot steam heat and mass in dehumidifier, obtain thermal wastewater and dehumidifying
Air；After the dehumidified air expanded device decompression, with thermal wastewater in humidifier heat and mass, obtain desulfurization wastewater concentrate and
Humidifying air；Desulfurization wastewater concentrate enters reverse osmosis machine through reverse osmosis (RO) pump and carries out reverse-osmosis treated, and reverse osmosis produced water is direct
Reuse, reverse osmosis concentrated liquid finally enter crystallisation solidification system and carry out curing process；Wherein, humidifying air is steamed with hot steam in heat
In vapour compressor dehumidifier reuse is sent into after mixing compression；
(3) crystallisation solidification
The heat smoke introduced using power plant's flue collector enters as carrier gas from the air inlet of fluidized crystallization drying tower, ball between transfer roller inner/outer tube
Particulate filler is blown into micro- floating fluidisation state；The Waste water concentrating liquid reheated after preheating or preheating, which is distributed to, is arranged in transfer roller
Atomizer on inner cylinder, atomizing spray to sphere padding surface carry out heat and mass with heat smoke, and moisture is walked by heat smoke band
To wet saturated flue gas, the salinity in concentrate dries hardened, the rotation with inner cylinder and heat in fluidisation state sphere padding surface crystallization
The flowing of flue gas, between salt lease making sphere padding grinding, collision fall off and sink to the crystallization collection cone of bottom of tower through outer barrel mesh screen
It struggles against, is condensed after the wet preheated device phase-change heat-exchange of saturated flue gas and form condensed water and remove wet flue gas, remove wet flue gas direct emission.
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