CN204939142U - Treatment facility of desulfurization waste water that flue gas desulfurization system discharged - Google Patents
Treatment facility of desulfurization waste water that flue gas desulfurization system discharged Download PDFInfo
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- CN204939142U CN204939142U CN201520718802.6U CN201520718802U CN204939142U CN 204939142 U CN204939142 U CN 204939142U CN 201520718802 U CN201520718802 U CN 201520718802U CN 204939142 U CN204939142 U CN 204939142U
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- 239000002351 wastewater Substances 0.000 title claims abstract description 49
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 48
- 230000023556 desulfurization Effects 0.000 title claims abstract description 48
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000003546 flue gas Substances 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000007788 liquid Substances 0.000 claims abstract description 76
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims description 42
- 239000000243 solution Substances 0.000 claims description 41
- 230000008569 process Effects 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 33
- 239000012267 brine Substances 0.000 claims description 21
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 21
- 238000005115 demineralization Methods 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 18
- 150000003839 salts Chemical class 0.000 claims description 13
- 238000010790 dilution Methods 0.000 claims description 12
- 239000012895 dilution Substances 0.000 claims description 12
- 230000002328 demineralizing effect Effects 0.000 claims description 11
- 239000003814 drug Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- 239000012141 concentrate Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000005189 flocculation Methods 0.000 claims description 6
- 230000016615 flocculation Effects 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229920001903 high density polyethylene Polymers 0.000 claims description 4
- 239000004700 high-density polyethylene Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000009292 forward osmosis Methods 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000004065 wastewater treatment Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 239000012528 membrane Substances 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 9
- 238000005265 energy consumption Methods 0.000 description 8
- 239000010802 sludge Substances 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 238000005352 clarification Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- 230000003204 osmotic effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
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- 239000002826 coolant Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004094 preconcentration Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 235000019600 saltiness Nutrition 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model provides a treatment facility of desulfurization waste water that flue gas desulfurization system discharged, treatment facility includes: a reverse osmosis system, a forward osmosis system and an auxiliary system; the reverse osmosis system is provided with a first water inlet, a first separated liquid outlet and a first concentrated liquid outlet, the first water inlet, the first separated liquid outlet and the first concentrated liquid outlet are used for enabling the desulfurized wastewater after water softening treatment to enter, the forward osmosis system is provided with a second water inlet, a second concentrated liquid outlet and a second separated liquid outlet, and the auxiliary system comprises a reuse water tank and a crystallizer; the first separation liquid outlet is connected with the recycling water tank, the first concentrated liquid outlet is connected with the second water inlet, the second concentrated liquid outlet is connected with the crystallizer, and the second separation liquid outlet is connected with the first water inlet. The utility model discloses a treatment facility has realized the waste water zero release, and green is pollution-free.
Description
Technical field
The utility model relates to field of industrial waste water treatment, in particular to the treatment facility of the desulfurization wastewater that a kind of flue gas desulphurization system discharges.
Background technology
For Wet Flue Gas Desulfurization Technology, its desulfurization wastewater is slightly acidic, containing a large amount of heavy metal elements and suspended solids.Therefore, the process of desulfurization wastewater is mainly with chemical-mechanical sedimentation method separating beavy metal and other precipitable thing (as fluorochemical, sulphite, vitriol etc.).Current domestic typical waste water treatment process is all derive based on the discharge characteristics of desulfurization wastewater, and therefore, traditional FGD Wastewater Treatment Process is generally made up of three parts such as Waste Water Treatment, sludge dewatering system, chemical medicine systems.Wherein, Waste Water Treatment is made up of three headers (in and case, sludge box, flocculation tanks), concentrating clarifying pond, outlet sump three part.
This three common header technology, namely traditional coagulation clarification comprehensive treatment technique, simple pre-treatment can only be accomplished, in order to realize the crystallization treatment of the salinity in desulfurization wastewater, the load of later crystallization device is very large, add the energy consumption of the various general facilitiess such as the steam in power plant, electricity, recirculated water so virtually, and adopt a large amount of chemical agents, all have harm to environment and HUMAN HEALTH.As can be seen here, not only running cost is high but also not environmental protection for traditional process equipment.
In view of this, special proposition the utility model.
Utility model content
The purpose of this utility model is the treatment facility of the desulfurization wastewater providing a kind of flue gas desulphurization system to discharge, and described sewage treatment equipment well can coordinate the advantage of the zero release achieving waste water with treatment process.
In order to realize above-mentioned purpose of the present utility model, spy by the following technical solutions:
The utility model embodiment provides the treatment process of the desulfurization wastewater of a kind of flue gas desulphurization system discharge, comprise the steps: (A) by desulfurization wastewater after water demineralization process, carry out reverse osmosis concentration and obtain the first parting liquid and the first concentrated solution;
(B) the second concentrated solution and the second parting liquid is obtained after described first concentrated solution being carried out positive osmosis concentration;
(C) the first parting liquid return for the production of, the second parting liquid returns in (A) step and re-starts reverse osmosis concentration, and the second concentrated solution then crystallization treatment obtains solid salt.
Inside Yao Shuo power plant, what the dirtiest water is, that is exactly desulfurization wastewater, desulfurization wastewater itself is in slightly acidic, the content of calcium ions and magnesium ions is very high, and the treatment process of desulfurization wastewater is generally derive based on the discharge characteristics of desulfurization wastewater in prior art, therefore, traditional FGD Wastewater Treatment Process is generally made up of three parts such as Waste Water Treatment, sludge dewatering system, chemical medicine systems.Wherein, Waste Water Treatment is made up of three headers (in and case, sludge box, flocculation tanks), concentrating clarifying pond, outlet sump three part.But the energy consumption of this treatment process own is high, adds running cost virtually, but also pollutes the environment.In view of the desulfurization wastewater amount of power plant is very large, the power plant that picture is larger is per hour produces desulfurization wastewater about 18 tons, therefore seek a kind of energy consumption low, can operate steadily and the desulfurization wastewater treatment technology of environmental protection extremely urgent, be also simultaneously benefit at the home of depending on for existence for the universe.In view of reality in the urgent need to and many technological deficiencies of existing desulfurization wastewater treatment technology, the utility model provides the treatment process of the desulfurization wastewater of a kind of flue gas desulphurization system discharge.
First, first carry out softening pre-treatment to desulfurization wastewater and become softening water, main object is to remove the calcium ions and magnesium ions that in desulfurization wastewater, content is very high, for subsequent disposal provides cleaner condition of water quality, avoid the destruction of generation to follow-up equipment of fouling, affect its normal service life.General sofening treatment step comprises: filter after adding medicine flocculation treatment, clarification, after ion-exchange absorption is filtered, adding medicine carries out flocculation treatment medicament used preferably sodium hydroxide and sodium carbonate, by adding sodium carbonate and sodium hydroxide medicament, react with the calcium ions and magnesium ions in water respectively and generate calcium carbonate and magnesium hydrate precipitate, cost is low and flocculating effect good.Visible, water demineralization is that follow-up flow process is long-term, continuous, stable, the prerequisite of Effec-tive Function, also be the crystal salt purity guarantee ensureing follow-up generation, after carrying out water demineralization according to above-mentioned flow process, produce water and meet total hardness at 20mg/L (0.4mmol/LCaCO
3) below, for subsequent cell provides good operational conditions, concentration rate can be improved further, the problems such as the fouling effectively avoiding follow-up system to cause because of calcium magnesium plasma.
Then, desulfurization wastewater after water demineralization process fully reduces because of its hardness, reverse-osmosis treated can be carried out, the product water of reverse osmosis concentration can directly return for the production of, in order to strengthen the water quality of producing water, meet the demand of different user, reverse osmosis concentration can be designed to multiple-stage treatment, what then first step reverse osmosis concentration obtained is the first concentrated solution, what last step reverse osmosis concentration obtained is the first parting liquid, the parting liquid of all the other ranks then continues to enter next rank and carries out reverse osmosis concentration, and concentrated solution then returns upper level and re-starts reverse osmosis concentration; Be preferably 2 grades of process.
Finally, the concentrated solution of reverse osmosis then enters forward osmosis membrane and concentrates further concentrate process.The concentration of the concentrated solution after positive osmosis concentration process is 4-5 times of reverse osmosis concentrated liquid, now positive osmosis concentration liquid saltiness can reach 200000-250000mg/L, just permeating and producing water and be back to reverse osmosis pre-concentration and refine, positive osmosis concentration liquid then directly can carry out crystallization treatment, need not additionally find other treatment processs, not only saved manpower and materials, also reduced cost for wastewater treatment, this advantage nowadays any one method of wastewater treatment can not be compared.So positive infiltration and counter-infiltration process to be combined, namely ensure that the water quality of producing water can direct reuse, turn improve the concentration of concentrated solution, kill two birds with one stone, very environmental protection.
Reverse osmosis is preferably 2 grades of process, remove the TDS of the overwhelming majority in water, produce water TDS < 20mg/L, purer, if want to increase water quality further, can be designed to multistage, also have the COD when feed water by reverse osmosis in water inlet and ammonia nitrogen cannot penetrate RO film, can not enter in product water, this ensure that the water quality of product more.
Just permeating is under the permeable pressure head of semi-permeable membranes both sides generation is motivating force, water molecules spontaneous from haline water to draw liquid infiltration process, and the material mainly producing propulsion source is for drawing liquid, the advantage of this concentration method does not need high-pressure pump just can run, and when energy consumption is less than hot method, can selectively remove the material dissolved in water.These features ensure that positive osmosis concentration technology has higher antifouling property, and relatively with existing desalinating process, the energy consumption of this technology and the consumption of chemical agent lower.Can ensure that forward osmosis membrane and reverse osmosis membrane have similar ratio of desalinization.Same, positive osmosis concentration also can be designed to single-stage or multiple-stage treatment, but is in cost and concentrated effect consideration, and uniprocessing can meet the demands.
The treatment process of the treatment process desulfurization wastewater different from the past of the desulfurization wastewater of this flue gas desulphurization system of the utility model discharge, this operational path is that utility model people puts into practice out by great many of experiments, record is there is no in prior art, wastewater zero discharge can be realized, environmental protection, to the person without any harm, extra ammonia nitrogen removal is not needed to operate in whole technical process, the ammonia-nitrogen content that can realize finally producing water is less than 1mg/L, and the water after positive osmotic treated also through multistage RO precision processing, can ensure the low ammonia-nitrogen content producing water completely.
The utility model embodiment, except providing the treatment process of the desulfurization wastewater of a kind of flue gas desulphurization system discharge, additionally provides a kind for the treatment of facility supporting with it, comprising: reverse osmosis system, positive osmosis system and subsystem; Described reverse osmosis system comprises the first water-in, the first discharge channel and the first concentrated solution outlet that the desulfurization wastewater after for water demineralization process enters, described positive osmosis system comprises the second water-in, the second concentrated solution outlet and the second discharge channel, and described subsystem comprises reuse water tank and crystallizer;
First parting liquid connects described reuse water tank, and the first concentrated solution connects the second water-in, and the second concentrated solution connects crystallizer, and the second parting liquid connects the first water-in.
The treatment facility of the desulfurization wastewater of the flue gas desulphurization system discharge that the utility model embodiment provides, can be good at matching with the treatment process of desulfurization wastewater, equipment manufacturing cost is low, floor space is little, operates steadily and energy consumption is low, finally achieve wastewater zero discharge, environmental protection.
In the utility model, also comprise water demineralization system, settling pond, more medium filter and ion-exchanger that described water demineralization system comprises raw water pump, also clarifies for adding medicine flocculation treatment, the desulfurization wastewater of described flue gas desulphurization system discharge enters the first water-in successively after raw water pump, settling pond, more medium filter and ion-exchanger process; Preferably, the material of ion-exchanger, more medium filter is FPR or HDPE material, and the material of the rotatable parts of described raw water pump is titanium material.
By adding sodium carbonate and sodium hydroxide medicament in settling pond, make Ca in water
2+with Mg
2+form CaCO
3precipitation and Mg (OH)
2the hardness of the water quality after softening in settler is about 100mg/L, the suspended substance of part in water, COD and colloidal silicon can be removed in settling pond simultaneously, from settling pond, product water out enters strainer and ion-exchanger and removes residual hardness in water and most suspended substance further, the total hardness of water < 10mg/L now after ion exchange softening.
Further, throw out can be transported to front end recycling with sludge delivery pump by the mud precipitating generation in settling pond, the supernatant liquor gravity flow that settling pond produces enters clarification water tank as the water inlet of follow-up multi-medium filtering unit, is promoted to multi-medium filtering unit processes further through softening water transferpump; Better alumen ustum is had for making melded system, improve softening treatment effect, arrange sludge circulation pump base sludge is back to system front end in settling pond, in settling pond, water inlet pipe mixes with water inlet, return sludge ratio according to practical situation variable frequency control, can regulate quantity of reflux.
Preferably, reverse osmosis system specifically comprises RO inlet chest, RO fresh feed pump, RO film and is set in the putamina of RO film outside;
Then the first water-in is arranged on described RO inlet chest, described putamina is provided with the first discharge channel and the first concentrated solution outlet, the desulfurization wastewater after water demineralization process enters to promote through RO fresh feed pump after RO inlet chest through the first water-in and is delivered in RO film and carries out reverse-osmosis treated.
Preferably, described positive osmosis system comprises FO strong brine case, FO fresh feed pump, draws liquid fresh feed pump, dilution is drawn liquid torage tank, drawn liquid recovery system, strong brine air lift system, FO film and be set in the putamina of FO film outside;
Then the second water-in is arranged on described FO strong brine case, draws in liquid recovery system described in described second discharge channel is arranged at, and described second concentrated solution outlet is arranged in described strong brine air lift system;
First concentrated solution enters from the second water-in and is transported to FO film through FO fresh feed pump, draw liquid to draw liquid torage tank by drawing liquid fresh feed pump and to be also transported in FO film and going to dilution after contacting with the first concentrated solution is reverse, draw liquid recovery system and from the second discharge channel fluid, the concentrated solution after FO film concentrate goes to crystallizer through strong brine air lift system from the second concentrated solution outlet fluid more simultaneously;
Preferably, described in draw liquid recovery system and comprise rectifying tower, then described second discharge channel is arranged at the bottom of the tower of described rectifying tower.
Preferably, described FO fresh feed pump, the material drawing the rotatable parts of liquid fresh feed pump are titanium material, and the material that liquid CDS torage tank is drawn in FO strong brine case and dilution is HPDE material, draws liquid recovery system and comprises rectifying tower, and the material of rectifying tower is FPR material.
Drawing liquid is by by a certain proportion of ammonia with carbon dioxide is soluble in water forms, and due to the solvability of height, therefore the solution of gained has high osmotic pressure.This high osmotic pressure even can drive water molecules through film when TDS of intaking is 150000mg/L.The water inlet of forward osmosis membrane is concentrated with drawing after liquid contacts, draw flow through (convection current) membrane stack with contrary direction after liquid enters putamina and by from Yuan Shui side through water dilute, drawn liquid torage tank by dilution and enter by the liquid that draws after diluting and draw liquid recovery system, generally draw liquid recovery system and comprise rectifying tower, therefore in rectifying tower, ammonia and carbon dioxide are decomposed out along with water vapor from solution.The gaseous mixture leaving rectifying tower tower top draws liquid with the dilution that bypass is come and mixes, and then carries out total condensation and absorption by heat exchanger.The FO gone out from tower bottom flow produces water and is collected and is sent to reverse osmosis system and carries out further desalination to produce the product water of more high-quality and to ensure residual, nonvolatile recovery of drawing liquid solute water.The concentrated solution of reverse osmosis system is recycled sends the further concentrate of positive osmosis system back to.
Further, in positive osmosis system, draw some ammonias in liquid and carbonic acid gas can enter in former water through forward osmosis membrane (contrary with the infiltration direction of water), this process is called counter diffusion.In order to the liquid that draws maintaining positive osmosis system is recycled in closed cycle mode, need counter diffusion to the lower ammonia of this part relative concentration in dense water and carbon dioxide recovery.Draw in liquid solute process in dense water reclaiming, the TDS concentration in dense water is also further improved.
In the utility model, drawing liquid recovery system except comprising rectifying tower, also comprising fresh feed pump, reboiler circulation pump, rectifying tower product water pump, DDS bypass pump, the pre-interchanger of charging, reboiler interchanger, CDS torage tank etc.Rectifying tower charging is the DDS solution after pre-heat exchange, to mix with DDS bypass through interchanger after rectifying tower top gaseous body mixes with dense water stripper overhead gas and get back to CDS torage tank, produce water at the bottom of rectifying tower and after heat exchange, get back to reverse osmosis system process.
Strong brine stripping system specifically comprises stripping tower and filler, fresh feed pump, reboiler circulation pump, stripping tower produce water pump, the pre-interchanger of charging, reboiler interchanger etc.Stripping tower charging is the FO strong brine after pre-heat exchange, and stripper overhead gas gets back to CDS torage tank with drawing to mix with DDS bypass through interchanger after liquid rectifying tower top gaseous body mixes, and produces water and be directly delivered to crystallizer at the bottom of stripping tower tower.
In addition, final condenser and vacuum system, the phlegma delivery system as thermal source, the water coolant delivery system as low-temperature receiver of the chemical cleaning system for cleaning RO film and FO film, rectifying tower and stripper overhead material is also comprised.
Subsystem also comprises whizzer and shaker conveyer except comprising crystallizer, reuse water tank, connects the whizzer dehydrated for solid salt and the shaker conveyer for conveying solid substance salt after described crystallizer successively; Preferably, the main material of crystallizer is 1.4529 stainless steels or Alloy926.Wherein, crystallizer runs under negative pressure state, and the concentrated solution produced by positive osmosis system continues concentrated, produces water solid crystal salt.Because the elevation of boiling point of crystallizer process strong brine is comparatively large, crystallizer adopts steam driven mode and is furnished with thermodynamic steam compressor to reduce live steam consumption, and major equipment has recycle pump, interchanger, condenser, transferpump and cyclone separator etc.And the solid particulate of crystallization, after centrifuge dewatering drying, be delivered to crystal salt packing shop by shaker conveyer and process further.
Equipment material of the present utility model is selected also to have certain requirements, because desulfurization wastewater itself is in slightly acidic, therefore consider and can be corrosive to operating equipment, and fully extension device is considered work-ing life, each assembly all have selected suitable material, and utility model people has paid a large amount of creative works from this point of view.
Prior art is compared, and the beneficial effects of the utility model are:
1) positive osmosis concentration technology is adopted, by positive osmosis system with draw liquid recovery system and combine, can realize concentrating softening water with lower energy consumption, strong brine after concentrated enters the salt manufacturing of later crystallization dehumidification system, the product water of forward osmosis membrane, through reverse osmosis system precision processing, produces water water quality and meets the demands completely.Softening water is concentrated into TDS by forward osmosis membrane system and is greater than 200000mg/L by the liquid that draws of high density, and the liquid that draws after dilution is reclaimed by rectifying tower, and strong brine enters the salt manufacturing of crystallizing and drying system through strong brine stripping system removal of ammonia and nitrogen.
2) whole equipment running process does not have latent heat losses.What consumed is only make water in each system and draw water pump that liquid recycle stream moves and the electric energy that Controlling System consumes.The condensed water that rectifying tower and stripping tower adopt power plant to provide heats tower bottom reboiler, and energy consumption is low, operate steadily.
3) this equipment does not need additional configuration ammonia nitrogen removal device, the fresh water ammonia-nitrogen content drawing the rectifier bottoms generation in liquid recovery system not only can control to and be less than 1mg/L, and produce water at the bottom of tower after reverse osmosis system precision processing below, final product water meets the demands completely, whole device also achieves wastewater zero discharge, the requirement of environmental protection.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.
Fig. 1 is the treatment facility structure iron of the desulfurization wastewater of the flue gas desulphurization system discharge of the utility model embodiment;
Fig. 2 is the equipment structure chart of the positive osmosis system in the treatment facility of the desulfurization wastewater of the flue gas desulphurization system discharge of the utility model embodiment;
Fig. 3 is the equipment structure chart of the subsystem in the treatment facility of the desulfurization wastewater of the flue gas desulphurization system discharge of the utility model embodiment;
Reference numeral:
101-raw water pump; 102-settling pond;
103-more medium filter; 104-ion-exchanger;
105-water demineralization system; 106-RO inlet chest;
107-RO fresh feed pump; 108-RO film;
109-reverse osmosis system; 110-FO strong brine case;
111-FO fresh feed pump; 112-draws liquid fresh feed pump;
113-FO film; Liquid torage tank is drawn in 114-dilution;
115-rectifying tower; 116-stripping tower;
The positive osmosis system of 117-; 118-reuse water tank;
119-crystallizer; 120-whizzer
121-shaker conveyer 122-subsystem.
Embodiment
Below in conjunction with embodiment, embodiment of the present utility model is described in detail, but it will be understood to those of skill in the art that the following example only for illustration of the utility model, and should not be considered as limiting scope of the present utility model.Unreceipted actual conditions person in embodiment, the condition of conveniently conditioned disjunction manufacturers suggestion is carried out.Agents useful for same or the unreceipted production firm person of instrument, be and can buy by commercially available the conventional products obtained.
The treatment facility of the desulfurization wastewater of the flue gas desulphurization system discharge of the utility model embodiment, primarily of water demineralization system 105, reverse osmosis system 109, positive osmosis system 117 and subsystem 122 4 part composition, desulfurization wastewater is successively after this four systems process, can realize purifying water and obtaining the object of the byproducts such as salt, the concrete device structure of each system not unified standard specifically, as long as can realize processing desulfurization wastewater, but arrange by having put into practice according to concrete treatment process also optimization best device structure in a large number, the concrete equipment that water demineralization system 105 and reverse osmosis system 109 comprise is can be clearly seen that in accompanying drawing 1, accompanying drawing 2 clearly can know the equipment that positive osmosis system comprises, 3, accompanying drawing is the equipment structure chart of subsystem, below by preferably several embodiment treatment process that desulfurization wastewater is described and the equipment layout that matches.
Embodiment 1
Former water is the desulfurization wastewater of FGD discharge and the clean brackish water 18m after being processed
3/ h and condensate polishing treatment mixed bed and moisturizing mixed bed of changing regenerate discharge brackish water 4m
3/ h, adopts raw water pump 101 to carry out being transported in settling pond 102, adds sodium carbonate and sodium hydroxide medicament, make Ca in water in settling pond 102
2+with Mg
2+form CaCO
3precipitation and Mg (OH)
2the hardness of the water quality after softening in settler is about 100mg/L, then from settling pond, product water out enters more medium filter 103 and ion-exchanger 104 and removes residual hardness in water and most suspended substance further, the total hardness < 10mg/L of the softening water now after ion exchange softening, this completes water demineralization operation.Whole water demineralization system 105 is according to 26.4m
3/ h configures, and normal design flooding quantity is 22m
3/ h, therefore system configuration meets 120% load of designed water, and follow-up reverse osmosis and positive osmosis system also consider 120% load according to designed water, can ensure the steady running of system during to ensure that the water yield fluctuates.
Water through sofening treatment enters reverse osmosis system 109, reverse osmosis system 109 is designed to uniprocessing, desulfurization wastewater after water demineralization process enters RO inlet chest 106 through the first water-in, promoted to be delivered in RO film 108 by RO fresh feed pump 107 again and to grade various ion refining with the salt removed in water, 30mg/L is less than from the TDS of RO film the first parting liquid out, specific conductivity (25 DEG C) is less than 30us/cm, reuse water tank 118 can be entered directly carry out for user, first concentrated solution then enters positive osmosis system 117 by the further concentrate of dense for RO water by the second water-in, positive osmosis system 117 is also designed to uniprocessing, FO film 113 concentrate is entered into through FO fresh feed pump 111 by FO strong brine case 110, draw simultaneously liquid by draw liquid fresh feed pump 112 and flow through (convection current) membrane stack with the direction contrary with the first concentrated solution and by from Yuan Shui side through water dilute, drawn liquid torage tank 114 by dilution and enter by the liquid that draws after diluting the rectifying tower 115 drawn in liquid recovery system, in rectifying tower 115, ammonia and carbon dioxide are decomposed out along with water vapor from solution, the gaseous mixture leaving rectifying 115 tower top draws liquid with the dilution that bypass is come and mixes, then total condensation and absorption is carried out by heat exchanger.And be collected from the second parting liquid that the second discharge channel at the bottom of rectifying tower flows out and again delivered to reverse osmosis system and to enter from the first water-in and carry out further desalination to produce the product water of more high-quality, concentrated solution in addition after FO film 113 concentrate goes to crystallizer 119 from the second concentrated solution outlet fluid bottom stripping tower 116 again after the stripping tower 116 in strong brine air lift system evaporates primary crystal, and from crystallizer 119 separate out solid particulate after whizzer 120 dehydrates, be delivered to crystal salt packing shop by shaker conveyer 121 to process further.
Embodiment 2
Equipment layout and processing step are all identical with embodiment 1, just reverse osmosis system 109 is designed to 2 grades, then when carrying out reverse osmosis concentration process, one-level RO film produces water and enters one-level RO product water tank, enter secondary RO film through the lifting of secondary RO high-pressure pump to refine, secondary RO produces water TDS and is less than 20mg/L, specific conductivity (25 DEG C) is less than 25us/cm, reuse water tank 118 can be entered directly carry out for user, be suitable for the user higher to water quality requirement, the concentrated solution of secondary RO film returns one-level RO film and re-starts reverse osmosis concentration.
Embodiment 3
Equipment layout and processing step are all identical with embodiment 2, just the material of each apparatus assembly has specific requirement, the material of ion-exchanger 104 and more medium filter 103 is FPR or HDPE material, the material of the rotatable parts of raw water pump 101 is titanium material, FO fresh feed pump 111, the material drawing the rotatable parts of liquid fresh feed pump 112 is titanium material, the material that liquid torage tank 114 is drawn in FO strong brine case 110 and dilution is HPDE material, draw liquid recovery system and comprise rectifying tower 115, the material of rectifying tower 115 is FPR material, the main material of crystallizer 119 is 1.4529 stainless steels or Alloy926.
Although illustrate and describe the utility model with specific embodiment, however it will be appreciated that can to make when not deviating from spirit and scope of the present utility model many other change and amendment.Therefore, this means to comprise all such changes and modifications belonged within the scope of the utility model in the following claims.
Claims (10)
1. a treatment facility for the desulfurization wastewater of flue gas desulphurization system discharge, is characterized in that, comprises reverse osmosis system, positive osmosis system and subsystem; Described reverse osmosis system is provided with the first water-in, the first discharge channel and the first concentrated solution outlet that the desulfurization wastewater after for water demineralization process enters, described positive osmosis system is provided with the second water-in, the second concentrated solution outlet and the second discharge channel, and described subsystem comprises reuse water tank and crystallizer;
First discharge channel connects described reuse water tank, and the first concentrated solution outlet connects the second water-in, and the second concentrated solution outlet connects crystallizer, and the second discharge channel connects the first water-in.
2. treatment facility according to claim 1, it is characterized in that, also comprise water demineralization system, settling pond, more medium filter and ion-exchanger that described water demineralization system comprises raw water pump, also clarifies for adding medicine flocculation treatment, the desulfurization wastewater of described flue gas desulphurization system discharge goes to the first water-in successively after raw water pump, settling pond, more medium filter and ion-exchanger process.
3. treatment facility according to claim 2, is characterized in that, ion-exchanger is the ion-exchanger of FPR or HDPE material.
4. treatment facility according to claim 2, is characterized in that, more medium filter is the more medium filter of FPR or HDPE material.
5. treatment facility according to claim 2, is characterized in that, described raw water pump rotatable parts be the rotatable parts of titanium material.
6. treatment facility according to claim 1, is characterized in that, described reverse osmosis system comprises RO inlet chest, RO fresh feed pump, RO film and is set in the putamina of RO film outside;
Then the first water-in is arranged on described RO inlet chest, described putamina is provided with the first discharge channel and the first concentrated solution outlet, the desulfurization wastewater after water demineralization process enters to promote through RO fresh feed pump after RO inlet chest through the first water-in and is delivered in RO film and carries out reverse-osmosis treated.
7. treatment facility according to claim 1, it is characterized in that, described positive osmosis system comprises FO strong brine case, FO fresh feed pump, draws liquid fresh feed pump, dilution is drawn liquid torage tank, drawn liquid recovery system, strong brine air lift system, FO film and be set in the putamina of FO film outside;
Then the second water-in is arranged on described FO strong brine case, draws in liquid recovery system described in described second discharge channel is arranged at, and described second concentrated solution outlet is arranged in described strong brine air lift system;
First concentrated solution enters from the second water-in and is transported to FO film through FO fresh feed pump, draw liquid to draw liquid torage tank by drawing liquid fresh feed pump and to be also transported in FO film and going to dilution after contacting with the first concentrated solution is reverse, draw liquid recovery system and from the second discharge channel fluid, the concentrated solution after FO film concentrate goes to crystallizer through strong brine air lift system from the second concentrated solution outlet fluid more simultaneously.
8. treatment facility according to claim 7, is characterized in that, described in draw liquid recovery system and comprise rectifying tower, then described second discharge channel is arranged at the bottom of the tower of described rectifying tower.
9. treatment facility according to claim 1, is characterized in that, subsystem also comprises whizzer and shaker conveyer, connects the whizzer dehydrated for solid salt and the shaker conveyer for conveying solid substance salt after described crystallizer successively.
10. treatment facility according to claim 9, is characterized in that, the crystallizer of crystallizer to be main body be 1.4529 stainless steels or Alloy926 material.
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| CN201520718802.6U CN204939142U (en) | 2015-09-16 | 2015-09-16 | Treatment facility of desulfurization waste water that flue gas desulfurization system discharged |
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|---|---|---|---|
| CN201520718802.6U CN204939142U (en) | 2015-09-16 | 2015-09-16 | Treatment facility of desulfurization waste water that flue gas desulfurization system discharged |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152405A (en) * | 2015-09-16 | 2015-12-16 | 华能国际电力股份有限公司 | Method and equipment for treating desulfurization wastewater discharged by flue gas desulfurization system |
| CN106277537A (en) * | 2016-11-02 | 2017-01-04 | 中国石油大学(华东) | A kind of a new combined process processed for high level salt solution continuous dehydration |
| CN110550701A (en) * | 2019-09-09 | 2019-12-10 | 中国电建集团华东勘测设计研究院有限公司 | Zero-emission concentration system for reverse osmosis process by using forward osmosis membrane module |
-
2015
- 2015-09-16 CN CN201520718802.6U patent/CN204939142U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152405A (en) * | 2015-09-16 | 2015-12-16 | 华能国际电力股份有限公司 | Method and equipment for treating desulfurization wastewater discharged by flue gas desulfurization system |
| CN106277537A (en) * | 2016-11-02 | 2017-01-04 | 中国石油大学(华东) | A kind of a new combined process processed for high level salt solution continuous dehydration |
| CN110550701A (en) * | 2019-09-09 | 2019-12-10 | 中国电建集团华东勘测设计研究院有限公司 | Zero-emission concentration system for reverse osmosis process by using forward osmosis membrane module |
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