CN208471753U - A kind of desulfurization wastewater Zero discharging system of humidification-dehumidifying coupling pressure retarded osmosis - Google Patents

Abstract

The utility model discloses a kind of humidification-dehumidifying coupling pressure retarded osmosis desulfurization wastewater Zero discharging systems.Pressure retarded osmosis is a kind of method of extraction salt error energy, two kinds of solution of different salinity are separated using selective penetrated property semi-permeable membrane, and apply the pressure less than two kinds of solution permeable pressure heads in high salinity side, the water of Low-salinity side is spontaneous to permeate from Low-salinity side to high salinity side, salt error can be changed into pressure energy, drive salinity gradient engine power generation.The utility model separates the recycling concentrate that desulfurization wastewater to be processed and conditioning Tower discharge with semi-permeable membrane, since the salinity of desulfurization wastewater to be processed is significantly less than the salinity of recycling concentrate, apply the pressure less than two kinds of solution permeable pressure heads in the recycling concentrate side of conditioning Tower discharge, the water of the desulfurization wastewater inflow side to be processed of Low-salinity is spontaneous to permeate from Low-salinity side to high salinity side, salt error can be changed into pressure energy, driving power generation.

Description

A kind of desulfurization wastewater Zero discharging system of humidification-dehumidifying coupling pressure retarded osmosis

Technical field

The utility model more particularly to a kind of humidification-dehumidifying coupling pressure retarded osmosis desulfurization wastewater Zero discharging system with Method.

Background technique

" GB13223-2003 thermal power plant atmosphere pollution row is issued and implemented from State Environmental Protection Administration on January 1 in 2004 in China 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.

" Ying You is proposed in " the DL/T5046-2006 Waste Water From Fire Power Plant Treatment design technical regulations " promulgated in 2006 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 and treatment to relevant device, the issuable corrosion of medium and adverse effect " related request.The same year has issued thermoelectricity Industry desulfurization wastewater professional standard " DL/T997-2006 thermal power plant 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.

" the control pollutant emission licence system embodiment " put into effect in November, 2016 takes the lead in pointing out to thermoelectricity, paper industry Enterprise's core sends out pollutant discharging license.Same month, State Council issue " 13 ecological environmental protections planning ", it is indicated that electric power, papermaking, printing and dyeing Pollutants emission intensity should be greatly reduced etc. highly water intensive industry, reach advanced norm standard.

On January 11st, 2017, Chinese Ministry of Environmental Protection printed and distributed " thermal power plant's pollution prevention technique policy " again, encouraged thermal power plant to realize useless Not outlet is recycled in water, 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 of water temperature or so；The especially a class of pollutant containing World Health Organization and China's strict control 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.

Summary of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of humidification-dehumidifying coupling pressure delay The desulfurization wastewater Zero discharging system and method for infiltration.

The above-mentioned purpose of the utility model is achieved by following technical solution:

A kind of desulfurization wastewater Zero discharging system of humidification-dehumidifying coupling pressure retarded osmosis, including desulfurization wastewater pretreatment System, pretreated water melded system, humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system and crystallisation solidification system；

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 precipitating mud that the water inlet being connected to flocculation tank, the flocculation being connected to cyclic water tank produce 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 being connected to crystallization settling tank and exports, What the nanofiltration water out generated is desulfurization wastewater pretreated water；

Humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system includes humidifier, dehumidifier, pressure retarded osmosis Component and salinity gradient engine；Wherein: dehumidifier is a bubble column heat exchanger, and the bottom of bubble column is equipped with cold inlet, The top of bubble column is equipped with the hot inlet for being passed through hot-air, and the side of bubble column sets condensation and produces water out, bottom and top Portion is also respectively equipped with dehumidified air outlet respectively and the thermal wastewater through hot-air preheating exports；Humidifier is an airdistillation tower, The lower part of airdistillation tower 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, desulfurization wastewater concentrated solution outlet are further connected to concentrate discharge tube and concentrate again Circulating line；The dehumidified air outlet of dehumidifier is connected to the air inlet of humidifier, the humidifying air outlet and dehumidifying of humidifier The hot inlet of device is connected to；The thermal wastewater outlet of dehumidifier is connected to the desulfurization wastewater inlet of humidifier, and on connecting line Equipped with heater；The pressure retarded osmosis component includes PRO film room, material liquid circuit and driving liquid circuit, and PRO film room is divided into Material liquid chamber and driving sap cavity room, centre separated with permeable membrane, material liquid chamber be equipped with desulfurization wastewater entrance to be processed (with receive Filtered water outlet connection), driving sap cavity room is connected to through high-pressure pump with the concentrate recirculation conduit, material liquid chamber and driving liquid Chamber passes through material liquid circuit and driving liquid circuit respectively and is connected to through radiator with the cold inlet of dehumidifier；Salinity gradient starts Machine is set on driving liquid circuit；

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；The transfer roller being made of inner barrel and outer barrel is equipped with inside tower body, outer cylinder 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 tower body wall by two shaft end, inner barrel and outer barrel Between space in be equipped with partial size be greater than outer cylinder 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 successively connected to the inlet opening；The periphery wall of the inner cylinder is additionally provided with for stirring in rotation what sphere padding was stirred 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 other end is connected to the concentrate discharge tube；The Waste water concentrating liquid heating unit includes being set to Waste water concentrating liquid inlet tube Preheater on road, the preheated device heating of Waste water concentrating liquid enter in the intracorporal transfer roller of tower；The preheater also with fluidized crystallization The wet flue gas outlet of 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, and nanofiltration system uses DK series Nano filtering composite membrane；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 Horizontal gas flow for being guided the entrance guiding plate for uprush by side；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 cylindrical body, and both ends are semicircle Sphere or cone；The modulation axis body of exit gas distributed modulation device is the cylindrical body that a lower end is semicircle sphere or cone； The modulation blade is set to the lower end of cylindrical body, including multiple be in tilted layout is used in cylindrical body 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 equidistantly circumferentially fixed and be set in the modulation vanes At the nearly lower end cone of the cylindrical body 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, and upper layer filler is adopted With structured packing, and often the unit volume specific surface area of upper one layer of 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 filler 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, the outer tube inner wall bottom of transfer roller is equipped with the scraper plate of multiple raising sphere padding grindings, collision efficiency.

Further, permeable membrane is polyamide composite film, and the active layer of film is towards driving liquid side, and supporting layer is towards raw material Liquid side.

It is a kind of using above-mentioned humidification-dehumidifying coupling pressure retarded osmosis system desulfurization wastewater Zero emission method, including such as Lower step:

(1) it pre-processes and softens

Desulfurization wastewater is inputted into vacuum filter, filtrate is discharged into flocculation tank and flocculation tank from water outlet Flocculant occur flocculation reaction, precipitated subsequently into clarifying basin, the supernatant after precipitating from flocculation produce water out enter Cyclic water tank, the precipitating 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 It obtains nanofiltration and produces 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, nanofiltration produce water and are concentrated into subsequent humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system；

(2) humidification-dehumidifying coupling pressure retarded osmosis concentration

Above-mentioned nanofiltration produces the recycling concentrate that water (desulfurization wastewater to be processed) and humidifier generate and enters pressure retarded infiltration Saturating component, the salinity difference that the two generates drive salinity gradient engine power generation, provide power for the system, recycling waste water with to Processing desulfurization wastewater dehumidifier is sent into after radiator heat-dissipation, with hot-air in dehumidifier heat and mass, obtain thermal wastewater and Dehumidified air；The dehumidified air and thermal wastewater heat and mass in humidifier, obtain desulfurization wastewater concentrate and humidifying air；It is de- Sulphur Waste water concentrating liquid part is discharged directly into crystallisation solidification system and carries out curing process, and partial recirculation enters pressure retarded infiltration Saturating component；

(3) crystallisation solidification

The hot fume 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；Desulfurization wastewater concentrate distributes to the atomizer being arranged on transfer roller inner cylinder, Atomizing spray to sphere padding surface and hot fume carries out heat and mass, and moisture is taken away to obtain wet saturated flue gas by hot fume, dense Salinity in contracting liquid is hardened in fluidisation state sphere padding surface crystallization drying, with the rotation of inner cylinder and the flowing of hot fume, salinity It is ground between sphere padding, collision falls off and collects cone bucket, wet saturated flue gas warp through the crystallization that outer cylinder mesh screen sinks to tower bottom Condensation forms condensed water and except wet flue gas, removes wet flue gas direct emission after preheater phase-change heat-exchange.

The utility model has coupled pressure retarded osmosis (PRO) unit in humidification-dehumidifying Waste water concentrating purification system, benefit Salinity caused by humidification-dehumidifying Waste water concentrating purification system between high concentration salt water and desulfurization wastewater water is poor, uses Salinity gradient engine (SGE) can be generated electricity using salt error, can convert electric power for available between two kinds of different salinity streams.By salt The electric energy that degree gradient engine (SGE) generates provides power for the operation of this system equipment.

Salt error can be the chemical-electrical potential difference energy between the solution of two kinds of various concentrations.Pressure retarded osmosis technology is to mention at present Take salt error can a kind of effective method, it be two kinds of solution of different salinity are separated using selective penetrated property semi-permeable membrane, and Apply the pressure less than two kinds of solution permeable pressure heads in high salinity side, the water of Low-salinity side is spontaneously from Low-salinity side to high salinity Side infiltration, and then salt error can be changed into pressure energy, driving salinity gradient engine (SGE) power generation.It i.e.: in the present case, will be to Processing desulfurization wastewater water and the recycling concentrate of conditioning Tower discharge are separated with selective penetrated property semi-permeable membrane, due to be processed de- The salinity of sulphur waste water water is significantly less than the salinity of the recycling concentrate of conditioning Tower discharge, dense in the recycling of conditioning Tower discharge Contracting liquid side applies the pressure less than two kinds of solution permeable pressure heads, and the water of the desulfurization wastewater inflow side to be processed of opposite Low-salinity is spontaneous Salt error can be changed into pressure from Low-salinity side to high salinity side (that is: the recycling concentrate of conditioning Tower discharge) infiltration by ground Power energy, driving salinity gradient engine (SGE) power generation.

Pressure retarded osmosis component is mainly by PRO film room, material liquid circuit (that is: desulfurization wastewater water to be processed) and driving Liquid circuit (that is: the recycling concentrate of conditioning Tower discharge) composition.PRO film room is divided into material liquid chamber and driving sap cavity room, in Between separated with permeable membrane.The supply of material liquid (that is: desulfurization wastewater water to be processed) origin water pump, driving liquid (that is: discharge by conditioning Tower Recycling concentrate) then conveyed by high-pressure pump, the general configuration intake pump before high-pressure pump.Since material liquid is (that is: to be processed de- Sulphur waste water water) salinity far below the driving liquid recycling concentrate of discharge (that is: conditioning Tower) salinity, it is former in film room The water of feed liquid (that is: desulfurization wastewater water to be processed) side can penetrate by selective semi-permeable membrane and (be less than material liquid with pressure The permeable pressure head between driving liquid) driving liquid the recycling concentrate of discharge (that is: conditioning Tower) side, drive liquid (that is: conditioning Tower The recycling concentrate of discharge) side liquor capacity increase, and be used to driving salinity gradient engine (SGE) power generation, thus Realize the extraction and utilization of salt error energy.The electric work amount generated by salinity gradient engine (SGE) is that the operation of this system equipment mentions For power.Theoretical calculation and experimental study show: arranging in typical desulfurization wastewater water 1-13% salinity and conditioning Tower to be processed Under 25% salinity of recycling concentrate put, about 2.7-10 kilowatt hour/cubic meter electric energy can be produced, it is sufficient to auxiliary for this system It helps equipment to provide power, and there is a possibility that system completely disengages power grid, and can be used for handle other ancillary equipments in place and supplying Electricity.It is specifically dependent upon the performance of water quality characteristic and system.

Detailed description of the invention

Fig. 1 is the structural block diagram of humidification-dehumidifying and reverse osmosis combined desulfurization wastewater Zero discharging system；

Fig. 2 is the structural block diagram of humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system；

Fig. 3 is the structural block 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 the structural schematic diagram for exporting deflector；

Wherein, 21- entrance guiding plate, 22- export deflector, and 23- modulates axis body, 24- blade, stirrup in 25-, outside 26- Stirrup, 31- inner cylinder, 32- outer cylinder, 33- sphere padding, 34- hydrojet pipeline, 35- atomizer, 36- dispensing orifice, 37- distributing valve, 38- inlet opening, 39- stir blade, 40- scraper plate, and 41- is connected to the pipeline of hydrojet pipeline and dispensing orifice, 42- desulfurization wastewater concentrate Entrance, 43- stir blade.

Specific embodiment

The utility model in essence content is specifically introduced with reference to the accompanying drawings and examples, but is not limited with this practical Novel protection scope.

A kind of humidification as shown in Figure 1-dehumidifying coupling pressure retarded osmosis desulfurization wastewater Zero discharging system, including desulfurization Waste water pretreatment system, pretreated water melded system, humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system and crystallization Curing 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 being connected to clarifying basin and produces water 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 circulation 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 the nanofiltration concentrated water being connected to crystallization settling tank and goes out 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 effect includes: mainly solid in 1, removal desulfurization wastewater Shape particulate matter；2, mud cake can be equal with desulfurized gypsum after being dehydrated disposes, and will not be included in dangerous waste；3, it is outstanding that desulfurization wastewater is greatly lowered Floating object, 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 membrane in aperture Preposition pretreatment of the group as nanofiltration system, can remove 0.1 μm and all of above substance, be mainly used for removing efficient flocculating production water In fine suspended solid, oil emulsion, colloid (silicon), clay etc., effluent quality enters water water quality requirement better than nanofiltration system；It is concentrated Liquid drains into mud pit, and water outlet enters water as nanofiltration system.Nanofiltration system uses DK series Nano filtering composite membrane.Using GE company DK Proprietary nanofiltration sandwich diaphragm is a kind of technical grade equipment with high desalinization reusing sewage nanofiltration membrane, preferentially cuts to divalent and multivalent ion It stays, it is related to the concentration of feed liquid and composition to the rejection size of monovalention.Water softening is produced for desulfurization wastewater efficient flocculating Divide salt (desalination, hardness, 1nm and above other impurities etc.).Concentrate is sent into crystallization settling tank, crystallization settling tank supernatant reflux It to cyclic water tank, crystallizes mud and enters mud pit, then be 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 produces water and decrement is further concentrated, and is concentrated Water fully recovering is produced after decrement, it is desulfurization wastewater pretreated water that the nanofiltration after concentration decrement, which produces water, is used for end curing process. Above-mentioned pretreatment system further includes cleaning unit.Ultrafiltration system and nanofiltration system require to clean, 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 operation, It is cleaned after operation 7-10 hours primary.Customary cleaning agent selects film producer or the dedicated 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 effect, maintainability is needed to clean, Maintainability cleaning agent selects film producer or other specialized factory's medicaments.Cleaning method is as follows: progress nanofiltration cleaning first: first using Nanofiltration produces 10-30 points of water cleaning, and medicament produces 10-30 points of water rinsing with nanofiltration later to intake direction wash cycles 10-30 points； 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 effect When bad, restorative cleaning is needed, restorative cleaning agent selects film producer or other specialized factory's medicaments.Cleaning method is such as Under: progress nanofiltration cleaning first: first producing water with nanofiltration and clean 10-30 points, and medicament is divided with direction wash cycles 10-30 of intaking, it 10-30 points of water rinsing is produced with nanofiltration afterwards, 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, humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system includes humidifier, dehumidifier, pressure Force delay filtration module and salinity gradient engine；Wherein: dehumidifier is a bubble column heat exchanger, and the bottom of bubble column is equipped with Cold inlet, the top of bubble column are equipped with the hot inlet for being passed through hot-air, and the side of bubble column sets condensation and produces water out, Bottom and top are also respectively equipped with dehumidified air outlet respectively and the thermal wastewater through hot-air preheating exports；Humidifier is an air Destilling tower, the lower part of airdistillation tower are equipped with air inlet, and top is equipped with desulfurization wastewater inlet, and bottom and top are respectively equipped with de- The outlet of sulphur Waste water concentrating liquid, humidifying air outlet, desulfurization wastewater concentrated solution outlet are further connected to concentrate discharge tube and dense Contracting liquid recirculation conduit；The dehumidified air outlet of dehumidifier is connected to the air inlet of humidifier, the humidifying air outlet of humidifier It is connected to the hot inlet of dehumidifier；The thermal wastewater outlet of dehumidifier is connected to the desulfurization wastewater inlet of humidifier, and is connected Pipeline is equipped with heater；The pressure retarded osmosis component includes PRO film room, material liquid circuit and driving liquid circuit, PRO film Room is divided into material liquid chamber and driving sap cavity room, and centre is separated with permeable membrane, and material liquid chamber is equipped with desulfurization wastewater to be processed and enters Mouthful, driving sap cavity room is connected to through high-pressure pump with the concentrate recirculation conduit, and material liquid chamber and driving sap cavity room lead to respectively Material liquid circuit and driving liquid circuit is crossed to be connected to through radiator with the cold inlet of dehumidifier；The salinity gradient engine is set to It drives on liquid circuit.Selected permeable membrane is the commercialized polyamide composite film of U.S. HTI company production, is a kind of non-right The thin-film composite membrane of title is made of fine and close active layer and porous support layer.The active layer of film is towards driving liquid (that is: humidification The recycling concentrate of tower discharge) side, supporting layer is towards material liquid (that is: desulfurization wastewater water to be processed) side.Airdistillation tower The interior packing layer that can be equipped with multi-layer lifting high heat transfer mass transfer effect, lower layer's filler use random packing, and upper layer filler is using regular Filler, and often the unit volume specific surface area of upper one layer of filler is 1.25-2.5 times of its next layer of filler；The random packing Select similar random packing similar in the efficient plastic filler of scrubbing tower and/or Te Laruide ring filler or functional performance, the rule Whole filler selects similar structured packing similar in impulse type structured packing or functional performance.

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；The transfer roller (as Figure 6-9) being made of inner barrel and outer barrel is equipped with inside tower body, Outer cylinder 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 partial size is greater than outer cylinder 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 successively connected to the inlet opening；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, hot fume 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 other end is connected to the concentrate discharge tube；Waste water concentrating liquid heating unit includes being set in Waste water concentrating liquid input duct Preheater, the preheated device heating of Waste water concentrating liquid enters in the intracorporal transfer roller of tower；The preheater is also dry with fluidized crystallization The wet flue gas outlet of tower, direct emission after the preheated device dehumidification by condensation of wet flue gas.Further, crystallisation solidification system is useless Concentrated liquid heating unit further includes the heat exchanger in Waste water concentrating liquid input duct, and the preheated device of Waste water concentrating liquid is pre- Enter in the transfer roller in tower body after heat, heat exchanger heating；Heat exchanger also with the heat source (hot water, steam that are heated for Waste water concentrating liquid Or hot fume) 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 guidance is the entrance guiding plate of uprush；The outlet modulating mechanism includes exit gas distributed modulation device and multiple is set to For uprush to be guided to the outlet deflector 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 set on the modulation leaves for modulating axis body surrounding Piece；The centre of the modulation axis body of inlet gas distributed modulation device is cylindrical body, and both ends are semicircle sphere or cone；Exit gas The modulation axis body of distributed modulation device is the cylindrical body that a lower end is semicircle sphere or cone；The modulation blade is set to cylindrical body Lower end, be used to vertical ascent air-flow being modulated into spinning updraft in cylindrical body circumferential direction including multiple be in tilted layout 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 equidistant circumferentially fixed and the cylindrical body 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, comprising:

(1) it pre-processes and softens

Desulfurization wastewater is inputted into vacuum filter, filtrate is discharged into flocculation tank and flocculation tank from water outlet Flocculant occur flocculation reaction, precipitated subsequently into clarifying basin, the supernatant after precipitating from flocculation produce water out enter Cyclic water tank, the precipitating 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 It obtains nanofiltration and produces 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, nanofiltration produce water and are concentrated into subsequent humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system；

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 coupling pressure retarded osmosis concentration

Above-mentioned nanofiltration produces the recycling concentrate that water (desulfurization wastewater to be processed) and humidifier generate and enters pressure retarded infiltration Saturating component, the salinity difference that the two generates drive salinity gradient engine power generation, provide power for the system, recycling waste water with to Processing desulfurization wastewater dehumidifier is sent into after radiator heat-dissipation, with hot-air in dehumidifier heat and mass, obtain thermal wastewater and Dehumidified air；The dehumidified air and thermal wastewater heat and mass in humidifier, obtain desulfurization wastewater concentrate and humidifying air；It is de- Sulphur Waste water concentrating liquid part is discharged directly into crystallisation solidification system and carries out curing process, and partial recirculation enters pressure retarded infiltration Saturating component；

(3) crystallisation solidification

The hot fume 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；Desulfurization wastewater concentrate distributes to the atomizer being arranged on transfer roller inner cylinder, Atomizing spray to sphere padding surface and hot fume carries out heat and mass, and moisture is taken away to obtain wet saturated flue gas by hot fume, dense Salinity in contracting liquid is hardened in fluidisation state sphere padding surface crystallization drying, with the rotation of inner cylinder and the flowing of hot fume, salinity It is ground between sphere padding, collision falls off and collects cone bucket, wet saturated flue gas warp through the crystallization that outer cylinder mesh screen sinks to tower bottom Condensation forms condensed water and except wet flue gas, removes wet flue gas direct emission after preheater phase-change heat-exchange.

The effect of above-described embodiment is specifically to introduce the essentiality content of the utility model, but those skilled in the art answer When knowing, the protection scope of the utility model should not be confined to the specific embodiment.

Claims (9)

1. a kind of humidification-dehumidifying coupling pressure retarded osmosis desulfurization wastewater Zero discharging system, it is characterised in that useless including desulfurization Water pretreatment system, pretreated water melded system, humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system and crystallization are solid Change 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 The precipitating mud that the water inlet of solidifying reaction tank connection, the flocculation being connected to cyclic water tank produce water out and be connected to mud pit goes 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 the mud entrance of settling tank, cyclic water tank connection；The cyclic water tank be equipped be connected to clarifying basin flocculation production 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 being connected to crystallization settling tank and exports, this is received What filtered water outlet generated is desulfurization wastewater pretreated water；

Humidification-dehumidifying coupling pressure retarded osmosis thickening-purification technology system includes humidifier, dehumidifier, pressure retarded osmosis component With salinity gradient engine；Wherein: dehumidifier is a bubble column heat exchanger, and the bottom of bubble column is equipped with cold inlet, bubble-cap The top of tower is equipped with the hot inlet for being passed through hot-air, and the side of bubble column sets condensation and produces water out, and bottom and top are also It is respectively equipped with dehumidified air outlet respectively and the thermal wastewater through hot-air preheating exports；Humidifier is an airdistillation tower, air The lower part of destilling tower is equipped with air inlet, and top is equipped with desulfurization wastewater inlet, and bottom and top are respectively equipped with desulfurization wastewater concentration Liquid outlet, humidifying air outlet, desulfurization wastewater concentrated solution outlet are further connected to concentrate discharge tube and concentrate recycling Pipeline；The dehumidified air outlet of dehumidifier is connected to the air inlet of humidifier, humidifying air outlet and the dehumidifier of humidifier Hot inlet connection；The thermal wastewater outlet of dehumidifier is connected to the desulfurization wastewater inlet of humidifier, and connecting line is equipped with Heater；The pressure retarded osmosis component includes PRO film room, material liquid circuit and driving liquid circuit, and PRO film room is divided into raw material Sap cavity room and driving sap cavity room, centre are separated with permeable membrane, and material liquid chamber is equipped with desulfurization wastewater entrance to be processed, drives sap cavity Room is connected to through high-pressure pump with the concentrate recirculation conduit, and material liquid chamber and driving sap cavity room pass through material liquid circuit respectively It is connected to through radiator with the cold inlet of dehumidifier with driving liquid circuit；The salinity gradient engine is set to driving liquid circuit On；

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；The transfer roller being made of inner barrel and outer barrel is equipped with inside tower body, outer cylinder is that both ends are fixed on tower body wall On peripheral wall be mesh tubular structure, inner cylinder is rotatably connected on tower body wall by two shaft end, inner barrel and outer barrel it Between space in be equipped with partial size be greater than outer cylinder 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 successively connected to the inlet opening；The periphery wall of the inner cylinder is additionally provided with for stirring in rotation what sphere padding was stirred 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 other end is connected to the concentrate discharge tube；The Waste water concentrating liquid heating unit includes being set to Waste water concentrating liquid inlet tube Preheater on road, the preheated device heating of Waste water concentrating liquid enter in the intracorporal transfer roller of tower；The preheater also with fluidized crystallization The wet flue gas outlet of 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, and nanofiltration system uses DK series Nano filtering composite membrane；It 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 knot 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 horizontal gas flow to be guided to the entrance guiding plate 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 are set to modulation The modulation blade of axis body surrounding；The centre of the modulation axis body of inlet gas distributed modulation device is cylindrical body, and both ends are semicircle sphere Or cone；The modulation axis body of exit gas distributed modulation device is the cylindrical body that a lower end is semicircle sphere or cone；It is described The lower end that blade is set to cylindrical body is modulated, including multiple be in tilted layout is used in cylindrical body 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 cylindrical body 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 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: be additionally provided with multilayer in airdistillation tower Packing layer, lower layer's filler use random packing, and upper layer filler uses structured packing, and often the unit volume of upper one layer of filler compares table 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 filler 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 Multiple scraper plates for improving sphere padding grinding, collision efficiency.

9. desulfurization wastewater Zero discharging system according to claim 1, it is characterised in that: the permeable membrane is that polyamide is compound Film, the active layer of film is towards driving liquid side, and supporting layer is towards material liquid side.