CN206521361U - Utilize flue gas and electrodialytic desulfurization wastewater zero-discharge treatment system - Google Patents
Utilize flue gas and electrodialytic desulfurization wastewater zero-discharge treatment system Download PDFInfo
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- CN206521361U CN206521361U CN201720033957.5U CN201720033957U CN206521361U CN 206521361 U CN206521361 U CN 206521361U CN 201720033957 U CN201720033957 U CN 201720033957U CN 206521361 U CN206521361 U CN 206521361U
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Abstract
Using flue gas and electrodialytic desulfurization wastewater zero-discharge treatment system, the system includes chemical precipitation flocculation unit, lime-flue gas pliable cell, film upgrading unit and evaporative crystallization unit；Based on said system, desulfurization wastewater raw water is handled first with chemical precipitation flocculation unit, the CO in milk of lime and power plant flue gas is then utilized2The hardness ionses such as the calcium and magnesium in efficient removal chemical precipitation flocculation unit water outlet, while realizing carbon dioxide discharge-reduction；Soften water outlet and enter ion selectivity electrodialysis cell progress efficient concentration after hyperfiltration treatment, obtain NaCl concentrated waters, further pass through evaporative crystallization and obtain NaCl Nacls；Electrodialysis fresh water is by low pressure coiled reverse osmosis membrane, and acquisition can reuse fresh water；Reverse osmosis concentrated water reenters electrodialysis cell；The utility model utilizes the CO in power plant flue gas2Instead of expensive soda ash, softening cost was both reduced, CO is promoted again2Emission reduction；Introduce electroosmose process to be concentrated, electrodialysis and counter-infiltration is under optimal treatment condition, reduce energy consumption.
Description
Technical field
The utility model is related to the technical field that desulfurization wastewater is handled using zero-discharge technology, and in particular to one kind utilizes cigarette
Road gas and electrodialytic desulfurization wastewater zero-discharge treatment system.
Background technology
Current most of coal-burning power plant of China carries out flue gas desulfurization using wet limestone-gypsum FGD technology (WFGD),
A certain amount of desulfurization wastewater of regular discharge is needed in sweetening process.Desulfurization waste water quality extreme difference, with salt content height, solid suspension
Content is high, hardness is high, corrosivity is strong, water quality with time and big working conditions change the features such as.In addition, also containing micro in desulfurization wastewater
Heavy metal element, such as mercury, chromium, cadmium, lead, wherein being much the first kind pollution for requiring strictly to control in national environmental standard
Thing.Domestic power plant is generally handled desulfurization wastewater using chemical precipitation flocculence, can remove a most huge sum of money in waste water
Belong to the materials such as ion, COD (COD), suspended solid (SS).However, by chemical precipitation flocculence handle water outlet in
Still there is very high salt content.
As environmental protection problem becomes increasingly conspicuous, more and more closed using zero-discharge technology processing desulfurization wastewater
Note.Promulgate within 2005《Chinese water-saving technology policy outline》It is distinctly claimed the reuse of enterprise development efflux wastewater and zero-emission skill
Art.The country promulgated for 2015《Water prevention and cure of pollution action plan》(ten, water), encourages energy-saving and emission-reduction advanced enterprises, agglomeration of industry
Area's water-use efficiency, discharging intensity etc. reach higher standard.Therefore, research desulfurization wastewater technique of zero discharge is that thermal power plant is realized
The only way of sustainable development.
The domestic research to desulfurization wastewater technique of zero discharge at present is in the starting stage, and basic thought is to pass through desulfurization wastewater
Certain pretreatment is crossed, concentration, the steam condensation reuse of generation, concentrate knot are evaporated to desulfurization wastewater using steam heating
Brilliant product packaging outward transport.However, the investment operating cost of existing desulfurization wastewater technique of zero discharge is higher.This is primarily due to desulfurization
Calcium ions and magnesium ions in waste water easily cause the fouling and corrosion of evaporation and crystallization system, cause equipment depreciation expense to improve；And steam
Send out crystallization process energy consumption higher, cause operating cost to increase.
In order to reduce equipment damage, it is necessary to carry out sofening treatment to desulfurization wastewater, the calcium ions and magnesium ions in removing water.Conventional
Softening process is lime-soda method, and medicament is costly.It is about that 200mM is calculated by calcium ions and magnesium ions total amount in desulfurization wastewater, processing
1 ton of waste water about needs to add carbonic acid 22kg, by 1500-2000 members/t soda ash unit price accounting, only the ton water medicament expense of soda ash just
Up to 40 yuan or so, significantly increase the cost of technique of zero discharge.
In order to reduce operation energy consumption, it is necessary to carry out decrement concentration to desulfurization wastewater.Hyperfiltration has that technique is simple, desalination
The high advantage of rate, still, reverse osmosis process, which has some intrinsic problems, to be solved：Produce Water Sproading rate relatively low；To water quality requirement
It is high；The dirt of film is stifled more serious, and Membrane cleaning is difficult, and the life-span is relatively low；High salinity causes operating pressure big and energy consumption increase.At place
When managing the poor desulfurization wastewater of water quality, the operating pressure of hyperfiltration often reaches more than 6MPa, and investment and operating cost enter one
Step is improved.In order to reduce the process costs of desulfurization wastewater zero-emission, a kind of concentration work for being more suitable for desulfurization wastewater processing is selected
Skill is very necessary.
The content of the invention
In order to solve the above problems, the purpose of this utility model is that providing one kind utilizes flue gas and electrodialytic desulfurization
Wastewater zero-discharge treatment system, by the coupling and optimization of each process procedure, reduces the operating cost of technique of zero discharge, realizes money
Source is recycled and environmental protection.
The utility model to achieve the above object, the technical scheme used for：
One kind utilization flue gas and electrodialytic desulfurization wastewater zero-discharge treatment system, including chemical precipitation flocculation unit 1,
Lime-flue gas pliable cell 2, film upgrading unit 3 and evaporative crystallization unit 4；
The chemical precipitation flocculation unit 1 is by being sequentially connected the neutralization pond connect, sedimentation basin, flocculation basin, clarification by pipeline
Pond and 1# clear water reserviors composition, the water inlet of neutralization pond are connected with the floss hole of desulfurization wastewater；Lime is provided with the neutralization pond
Newborn chemicals dosing plant；Organic sulfur chemicals dosing plant is provided with the sedimentation basin；Flocculant and flocculation aid are provided with the flocculation basin
Chemicals dosing plant；Mud discharging mouth is arranged at the depositing reservoir bottom, and mud discharging mouth is connected by pipeline with device for dehydrating sladge waste；
Causticizing reaction pond that the lime-flue gas pliable cell 2 is connect by being sequentially connected by pipeline, carburizing reagent pond and
2# clear water reserviors are constituted, and causticizing reaction pond is connected with the 1# clear water reserviors in chemical precipitation flocculation unit 1 by pipeline；The causticization is anti-
Ying Chizhong is provided with milk of lime, sodium sulphate, flocculant and flocculation aid chemicals dosing plant, and there are mud discharging mouth, spoil disposal in causticizing reaction bottom of pond portion
Mouth is connected by pipeline with device for dehydrating sladge waste；The bottom in the carburizing reagent pond is disposed with gas distributor, gas distributor
It is connected with flue gas compression fan, flocculant, flocculation aid chemicals dosing plant is provided with carburizing reagent pond, carburizing reagent bottom of pond portion has
Mud discharging mouth, mud discharging mouth is connected by pipeline with device for dehydrating sladge waste；Watery hydrochloric acid chemicals dosing plant is provided with the 2# clear water reserviors；
The film upgrading unit 3 is by being sequentially connected the ultrafiltration apparatus connect, electrodialysis plant and reverse osmosis unit by pipeline
Composition；The water inlet of the ultrafiltration apparatus is connected with the delivery port of the 2# clear water reserviors of lime-flue gas pliable cell 2, ultrafiltration dress
The delivery port put is connected with the water inlet of electrodialysis plant, concentrated water water return outlet and the chemical precipitation flocculation unit 1 of ultrafiltration apparatus
Neutralization pond is connected；The concentrated water discharge of electrodialysis plant mouthful is connected with evaporative crystallization unit 4, fresh water floss hole and reverse osmosis unit
Water inlet is connected；The concentrated water discharge mouthful of the reverse osmosis unit counter-infiltration is connected with the water inlet of electrodialysis plant.
The electrodialysis plant is multi-stage countercurrent pole-reversing electroosmosis, employs monovalent ion selective membrane,
The reverse osmosis unit employs coiled reverse osmosis membrane.
The evaporative crystallization unit 4 employs mechanical recompression evaporator.
One kind utilizes flue gas and electrodialytic zero emission treatment of desulfured waste water, and this method is real using the system
Existing, methods described comprises the following steps：
(1) desulfurization wastewater raw water is passed through the neutralization pond of chemical precipitation flocculation unit 1, sedimentation basin, flocculation basin and clear successively
Clear pond is neutralized, precipitated, being flocculated and clarifying treatment, and clarified solution finally enters 1# clear water reserviors；
(2) clarified solution in above-mentioned steps (1) is passed through the causticizing reaction pond in lime-flue gas pliable cell 2 successively
Causticization, carbonization treatment are carried out with carburizing reagent pond, clarified solution enters 2# clear water reserviors；
(3) clarified solution for obtaining above-mentioned steps (2) is passed through film upgrading unit 3, and the clarified solution is carried out at ultrafiltration first
Reason, the production water of ultrafiltration is passed through electrodialysis plant and carries out point salt and a concentration；The fresh water that electrodialysis is produced is passed through reverse osmosis unit progress
Purifying, while producing the concentrated water containing NaCl；The fresh water that counter-infiltration is produced is back to production, and the concentrated water of generation reenters electric osmose
Analysis apparatus is handled；
(4) concentrated water containing NaCl for producing above-mentioned steps (3) electrodialysis plant is passed through evaporative crystallization unit 4, obtains
To technical grade NaCl crystal salts and condensed water, recycling condensing water is in production；
In the step (1), added in neutralization pond and organic sulfur added in milk of lime, sedimentation basin, milk of lime or organic sulfur with
Iron, lead, chromium, copper, the reaction of mercury heavy metal ion produce hydroxide or sulfide；
In the step (1), flocculant is added in flocculation basin, the suspension in waste water is produced in precipitation, depositing reservoir and adds
Enter flocculation aid, the sediment of generation is accelerated separation；
In the step (2), milk of lime and sodium sulphate are added in causticizing reaction pond, occurs following reactions：
Ca(OH)2+MgSO4→CaSO4+Mg(OH)2↓
Ca(OH)2+Na2SO4→CaSO4+2NaOH
Remove the Mg in waste water2+Ion simultaneously produces sodium hydroxide, and certain flocculant is then added into system and helps solidifying
Agent, fully flocculation clarification；
In the step (2), flue gas is passed through in carburizing reagent pond, occurs following reactions：
2NaOH+CO2→Na2COg+H2O
Na2CO3+Ca2+→CaCO3↓+2Na+
Remove the Ca in waste water2+Ion, certain flocculant and flocculation aid is then added into system, is fully flocculated clear
Clearly；
In the step (2), the addition of milk of lime and sodium sulphate should control to produce sodium hydroxide in causticizing reaction pond
Amount is between 0.05-0.2g/L；
In the step (2), the flue gas being passed through in carburizing reagent pond is the neat stress Jing Guo denitration, dedusting and desulfurization,
It is slowly introducing at normal temperatures and pressures, the intake of flue gas should make the pH of system between 9-13；
In the step (3), the purpose of ultrafiltration is to remove the suspended solid (SS) in water, water outlet is met follow-up film process
With the requirement of evaporative crystallization processing, the neutralization pond of ultrafiltration concentrate recirculation to chemical flocculation precipitation unit 1；
In the step (3), electrodialysis-ion exchange film uses monovalent ion selective membrane, makes the Cl in waste water-Dense
It is enriched with water, and SO4 2-Dilute side is stayed in, the purity of later crystallization is improved；
In the step (3), total dissolved solid (TDS) is full below 0.05% in the fresh water that reverse osmosis unit is produced
The requirement of sufficient industrial reuse water, film upgrading unit fresh-water recovery rate is not less than 90%.
In the step (1), the flocculant added in flocculation basin is poly-ferric sulfate chloride, aluminium polychloride, polymerised sulphur
One or more in sour iron；The flocculation aid added in depositing reservoir is one kind in polyacrylamide, Sodium Polyacrylate, chitosan
Or it is several.
In the step (2), the flocculant added in causticizing reaction pond is poly-ferric sulfate chloride, aluminium polychloride, gathered
Close the one or more in ferric sulfate；The flocculation aid added in causticizing reaction pond is polyacrylamide, Sodium Polyacrylate, chitosan
In one or more；
In the step (2), the flocculant added in carburizing reagent pond is poly-ferric sulfate chloride, aluminium polychloride, gathered
Close the one or more in ferric sulfate；The flocculation aid added in carburizing reagent pond is polyacrylamide, Sodium Polyacrylate, chitosan
In one or more.
In the step (3), electrodialysis plant uses the operation of falling pole, it is to avoid the fouling of film surface.
Compared with prior art, the utility model has the following advantages that：
1) water outlet of the net flue gas using coal-burning power plant Jing Guo denitration, dedusting, desulfurization to chemical precipitation flocculation unit is entered
Row softening, can either replace expensive soda ash, reduction softening cost reach higher softening efficiency, it is to avoid follow-up equipment
Fouling and corrosion, promote CO again2Emission reduction.Calculated by calcium ions and magnesium ions total amount 200mM in desulfurization wastewater, handle desulfurization wastewater per ton
While can emission reduction about 8.8g carbon dioxide.
2) introduce electroosmose process and improve traditional film concentration technology, electrodialysis and counter-infiltration is in optimal treatment condition
Under, reduction energy consumption and processing cost；Electrodialysis-ion exchange film can use monovalent ion selective membrane, make the SO in waste water4 2-Stay
In dilute side, Cl-Ion is enriched with concentrated water, and then obtains technical grade NaCl crystal salts by evaporative crystallization.
Brief description of the drawings
Fig. 1 is the utility model system and method flow chart.
Embodiment
The utility model is described in more detail with specific embodiment below in conjunction with the accompanying drawings.
Desulfurization wastewater raw water main component is as follows：TDS 20000‐60000mg/L；SS 5000‐10000mg/L；SO4 2‐
2000‐6000mg/L；Ca2+1500‐5000mg/L；Mg2+3000‐6000mg/L.As shown in figure 1, desulfurization wastewater is passed through into chemistry
Precipitation flocculation unit 1 is neutralized, precipitated, being flocculated, clarifying treatment, by adding milk of lime, organic sulfur, poly-ferric sulfate chloride
Precipitation flocculation reaction is carried out with polyacrylamide, is met《Thermal power plant's Limestone-gypsum Wet Flue Gas Desulfurization Process waste water quality control refers to
Mark》The clarified solution of the water quality requirement of (DL/T 997-2006)；The clarified solution of acquisition is passed through into lime-flue gas pliable cell 2 to enter
Row causticization, carbonization and clarifying treatment, by adding milk of lime and sodium sulphate, make the Mg in system2+Settle down, while sodium sulphate
With milk of lime reaction generation calcium sulfate precipitation and sodium hydroxide；Poly-ferric sulfate chloride and polyacrylamide are added into system,
Fully flocculation clarification.Gained clarified solution is passed through carbonization pond, the neat stress Jing Guo denitration, dedusting and desulfurization is passed through carbonization pond
In, the carbon dioxide in flue gas is absorbed by the sodium hydroxide in system produces carbonate, carbonate and calcium ion formation carbonic acid
Calcium precipitate.In the lime-flue gas pliable cell 2, the accumulation of causticizing reaction sodium hydroxide is 0.1g/L, after flue gas is passed through
System pH is changed into 10.Bodied ferric sulfate and Sodium Polyacrylate, fully flocculation clarification are added into system.Lime-flue gas softening
The water outlet calcium ions and magnesium ions total amount of unit 2 is no more than 20mg/L.The clarified solution that lime-flue gas pliable cell 2 is obtained is surpassed
Filter is handled, and ultrafiltration producing water ratio is 95%, concentrate recirculation to chemical precipitation flocculation unit again coagulating sedimentation；The fresh water that ultrafiltration is produced
Middle SS is less than 0.2mg/L, is passed through electrodialysis plant and is concentrated.Electrodialysis plant is operated using frequently pole-reversing, prevents fouling；From
Proton exchange makes the Cl in waste water from the selective exchange membrane of monovalent ion‐And SO4 2‐Separate, make sodium chloride in electrodialysis
It is enriched with concentrated water, improves the purity of later crystallization.Electrodialysis produces the concentrated water that TDS is 15%, warp using 5 and 2 string connected modes
Technical grade NaCl crystal salts are obtained after the evaporative crystallization of pervaporation crystalline element 4.Electrodialysis fresh water TDS is 0.5%, passes through anti-pollution
Coiled reverse osmosis membrane is further purified, and reverse osmosis freshwater TDS can be used as industrial reuse water below 0.05%.Reverse osmosis concentrated water
TDS is 2%, and 6% is concentrated into by one-level electrodialysis, and technical grade Na is obtained after evaporative crystallization2SO4Crystal salt, electrodialysis is light
Water is back at feed water by reverse osmosis.Film upgrading unit production Water Sproading rate is 80%.The utility model proposes desulfurization wastewater zero-emission
Method is put, changing waste into resources can be achieved and utilizes, waste water and solid waste pollution are eliminated, with good economy and environmental benefit.
Claims (4)
1. utilize flue gas and electrodialytic desulfurization wastewater zero-discharge treatment system, it is characterised in that：The system includes chemistry
Precipitate flocculation unit (1), lime-flue gas pliable cell (2), film upgrading unit (3) and evaporative crystallization unit (4)；
The chemical precipitation flocculation unit (1) is by being sequentially connected the neutralization pond connect, sedimentation basin, flocculation basin, depositing reservoir by pipeline
With 1# clear water reserviors composition, the water inlet of neutralization pond is connected with the floss hole of desulfurization wastewater；Milk of lime is provided with the neutralization pond
Chemicals dosing plant；Organic sulfur chemicals dosing plant is provided with the sedimentation basin；Flocculant is provided with the flocculation basin and flocculation aid adds
Medicine device；Mud discharging mouth is arranged at the depositing reservoir bottom, and mud discharging mouth is connected by pipeline with device for dehydrating sladge waste；
Causticizing reaction pond, carburizing reagent pond and 2# that the lime-flue gas pliable cell (2) is connect by being sequentially connected by pipeline
Clear water reserviors are constituted, and causticizing reaction pond is connected with the 1# clear water reserviors in chemical precipitation flocculation unit (1) by pipeline；The causticization is anti-
Ying Chizhong is provided with milk of lime, sodium sulphate, flocculant and flocculation aid chemicals dosing plant, and there are mud discharging mouth, spoil disposal in causticizing reaction bottom of pond portion
Mouth is connected by pipeline with device for dehydrating sladge waste；The bottom in the carburizing reagent pond is disposed with gas distributor, gas distributor
It is connected with flue gas compression fan, flocculant, flocculation aid chemicals dosing plant is provided with carburizing reagent pond, carburizing reagent bottom of pond portion has
Mud discharging mouth, mud discharging mouth is connected by pipeline with device for dehydrating sladge waste；Watery hydrochloric acid chemicals dosing plant is provided with the 2# clear water reserviors；
The film upgrading unit (3) is by being sequentially connected the ultrafiltration apparatus connect, electrodialysis plant and reverse osmosis unit group by pipeline
Into；The water inlet of the ultrafiltration apparatus is connected with the delivery port of the 2# clear water reserviors of lime-flue gas pliable cell (2), ultrafiltration dress
The delivery port put is connected with the water inlet of electrodialysis plant, concentrated water water return outlet and the chemical precipitation flocculation unit (1) of ultrafiltration apparatus
Neutralization pond be connected；The concentrated water discharge mouthful of electrodialysis plant is connected with evaporative crystallization unit (4), and fresh water floss hole is filled with counter-infiltration
The water inlet put is connected；The concentrated water discharge mouthful of the reverse osmosis unit counter-infiltration is connected with the water inlet of electrodialysis plant.
2. utilization flue gas according to claim 1 and electrodialytic desulfurization wastewater zero-discharge treatment system, its feature exist
In：The electrodialysis plant is multi-stage countercurrent pole-reversing electroosmosis, employs monovalent ion selective membrane.
3. utilization flue gas according to claim 1 and electrodialytic desulfurization wastewater zero-discharge treatment system, its feature exist
In：The reverse osmosis unit employs coiled reverse osmosis membrane.
4. utilization flue gas according to claim 1 and electrodialytic desulfurization wastewater zero-discharge treatment system, its feature exist
In：The evaporative crystallization unit (4) employs mechanical recompression evaporator.
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| CN106830479A (en) * | 2017-01-11 | 2017-06-13 | 中国华能集团清洁能源技术研究院有限公司 | Using flue gas and electrodialytic desulfurization wastewater zero-discharge treatment system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106830479A (en) * | 2017-01-11 | 2017-06-13 | 中国华能集团清洁能源技术研究院有限公司 | Using flue gas and electrodialytic desulfurization wastewater zero-discharge treatment system and method |
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