CN206279019U - A kind of processing unit of power plant desulfurization wastewater zero discharge - Google Patents
A kind of processing unit of power plant desulfurization wastewater zero discharge Download PDFInfo
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- CN206279019U CN206279019U CN201621294191.8U CN201621294191U CN206279019U CN 206279019 U CN206279019 U CN 206279019U CN 201621294191 U CN201621294191 U CN 201621294191U CN 206279019 U CN206279019 U CN 206279019U
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Abstract
The utility model discloses a kind of equipment of water-treatment technology field, and in particular to a kind of processing unit of power plant desulfurization wastewater zero discharge.The utility model is that the desulfurization wastewater of power plant desulphurization system is connected with the import of crystallization apparatus is triggered, and triggers the calcium sulphate crystal discharge produced by crystallization apparatus, and the product water out for crystallizing filter is connected with the import of EDR devices；The dope outlet of EDR devices is divided into two-way, is connected with crystallization apparatus and bipolar membrane device is triggered respectively, and water outlet is connected with power plant desulphurization system；Acid ＆ alkali liquid discharge produced by bipolar membrane device is utilized.The advantage of the application can be effectively to realize zero-emission, and simple to operate, investment goods is also little, and use cost is relatively low, popularization is easy.
Description
Technical field
A kind of equipment that the utility model belongs to water-treatment technology field, and in particular to place of power plant desulfurization wastewater zero discharge
Reason device.
Technical background
Development, water resources problems, especially shortage of water resources are fully exposed with the contradiction of socio-economic development.
The whole nation is every year on average because of non-irrigated about 400,000,000 mu disaster-stricken of area.The annual billion cubic meter of water shortage 300 in normal year whole nation irrigated area, city lacks
The billion cubic meter of water 60.While water shortage, serious water waste is also there is, National Agricultural irrigation water usage factor is most
Only 0.4, and many countries have reached 0.7~0.8；China's ten thousand yuan of output value water consumptions of industry are 103 cubic metres, are developed countries
10~20 times, recycling rate of waterused China of water is 50% or so, and developed country is more than 85%.Inefficient is caused with water
Substantial amounts of effluent sewage discharge, whole nation year effluent sewage total emission volumn is up to 62,000,000,000 m at present3, major part is unprocessed to be directly discharged into
River, river, lake, storehouse, make China river basin generally be contaminated, and in development trend.The annual warp caused by water pollution of China
Ji loss accounts for the 1.5%-3.0% of GDP.Using water wisely, clean manufacturing, have important for the economic sustainable development of China
Strategic importance.
The water consumption of thermal power industry ranks five high water usage industries (thermal power generation, weaving, papermaking, steel and oil
Chemical industry) first of, its water consumption accounts for more than the 50% of national industrial water total amount.According to former State Economic and Trade Commission's auspices《Work
Industry water saving " 12 " planning》, within 6350 billion cubic meters, ten thousand yuan of whole nation GDP water consumptions are reduced for national water total amount control
To less than 105 cubic metres, 30% was declined than 2010；Ten thousand yuan of industrial added value water consumptions were reduced to 63 cubic metres, than 2010
Reduce by more than 30%；
The national average leak rate of the planned city water supply network is no more than 18%；Desalinization, reclaimed wastewater reuse, rainwater accumulating
Fresh fresh water amount is substituted using the unconventional water utilization year such as, mine drainage utilization to reach more than 100 billion cubic meters.By 2015,
It is required that accomplishing direct cooling water withdrawal zero growth rate, unit generated energy water withdrawal drops to (after deducting once-through cooling water) 29.9m3/
Ten thousand kilowatt hours (equivalent generating water consumption index is 0.833m3/ (GW.s)).Due to the water resource spatial distribution and Annual distribution of China
Extremely unbalanced, the 8I% integrated distributions of gross amount of water resources are in the Changjiang river and its areas to the south, the precipitation quantity set of annual 60%-80%
In in 4 months flood seasons, the result is that especially Huang, Huaihe River, the wide geographic area of the extra large provinces and cities of three basin 9 seriously lack for the northern area of China
Water.Therefore, the thermal power plant in areas of serious is necessarily required by the generating water consumption index control lower than average national level
Water consumption processed, most of power plant is required to accomplish waste water zero emission.
Wastewater zero discharge (Zero Liquid Discharge, abbreviation ZLD), has been first by economy since the 1970's
What developed country proposed, and studied and applies, at present still in the comprehensive application technology for constantly improving.ZLD is generally referred to
Factory with water in addition to the natural loss such as evaporation, wind, all (by various treatment) used in factory's interior circulation, outwards do not arrange
What waste water is let alone, the salt accumulated in water circulation system is discharged in solid form by evaporation, crystallization.Because thermal power plant's water consumption
Greatly, and substantial amounts of remaining (useless) heat is available for utilization, thus the main application fields of ZLD are thermal power plants.China's power industry
Since " 95 " (1995-2000).Start to throw in the case where the increasingly serious situation of water scarcity and water pollution situation is forced
Entering strength carries out the experimental study of ZLD, and starts the practical application in thermal power plant.Up to the present, existing ten Yu Jia thermal power plants
Implement the ZLD of different modes, be essentially all with process and reuse recirculated water draining be main contents.From operation has been put into
ZLD system operational effect from the point of view of can obtain preferable water-saving result, some power plant really can therefore and accomplish not discharge times
What waste water.However, compared with international most advanced level, China it is existing and in the ZLD system built in design rationality, stable
There is larger gap in the aspects such as property, operational effect.Yet there is a problem of that some have much room for improvement simultaneously.
The high slat-containing wastewater of current thermal power plant mainly has resin regeneration acid, alkali waste water and desulfurization wastewater, the most frequently used way
It is that high slat-containing wastewater is used for grey storehouse stirring and coal yard spray, but this can influence the reuse quality and coal yard and defeated coal measures of lime-ash again
The spray operation of system.In fact this kind of reuse mode does not solve the problems, such as the reuse of high slat-containing wastewater fundamentally, simply marries again
To other systems.
It is overall apparently to have the characteristics that although domestic each power plant desulfurization water quality is different：1) in faintly acid；2) heavy metal
Content is high；3) salinity is high, and chlorion is high, accelerates corrosion rate；4) containing a large amount of raw incrustation ions, contain in recovered water
The easily incrustation ion such as SO42-, CO3-, Ca2+, Mg2+, Ba2+；5) suspension content is high, particle is tiny.
For power plant desulfurization waste water, typically in acid (pH4~6), suspension in 9000~12700mg/L, it is general it is mercurous,
The non-metal contaminants such as the heavy metals such as lead, nickel, zinc and arsenic, fluorine.Because desulfurization wastewater belongs to faintly acid, therefore many heavy metal ion
There is good dissolubility.So, the treatment of desulfurization wastewater is mainly with chemistry, mechanical means separating beavy metal and other are precipitable
Material, such as fluoride, sulphite and sulfate.
The discharge characteristics that the typical desulphurization method of wastewater treatment of domestic current is all based on desulfurization and dedusting waste water is derived,
For different types of pollutant, its respective cutting mechanisms is as follows：
First milk of lime or other alkali electroless reagents are added in waste water (such as：NaOH etc.), pH value is adjusted to 6~7, after being
Continuous handling process link creates good technical conditions, while can effectively remove fluoride (generation CaF2 precipitations) in the link
With part heavy metal.Be subsequently adding milk of lime, organic sulfur and flocculant, pH risen to 8~9, make heavy metal with hydroxide and
The form precipitation of sulfide.
Precipitate and separate is a kind of conventional metal separation, in addition to active metal, the dissolving of perhaps polymetallic hydroxide
Degree is smaller.Therefore desulfurization wastewater produces hydroxide precipitation typically using soluble hydroxide, such as NaOH (NaOH) is added
Carry out separation of heavy metal ions.It is noted that due under different pH value, the solubility product difference of metal hydroxides compared with
Greatly, therefore when reacting its pH value should strictly be controlled.
In desulfurization wastewater treatment, between general control pH value 8.5~9.0, some heavy metals can be made in the range of this,
Such as iron, copper, lead, nickel and chromium generation hydroxide precipitation.It is general using addition dissolvable sulfide for heavy metals such as mercury, copper
Such as vulcanized sodium (Na2S), to produce Hg2S, CuS etc. to precipitate, both deposit solubility all very littles, the solubility product order of magnitude exists
Between 10-40~1050.
Vulcanized sodium is used for mercury, as long as addition is less than 1mg/LS2-, so that it may produce work to the mercury less than 10 μ g/L concentration
With.In order to improve heavy metal precipitation process, a kind of mud that can well precipitate is prepared, typically usable trivalent iron salt such as FeCl3
And the generally flocculant of anion state.By above two stages for the treatment of, you can make heavy metal qualified discharge.
Also some techniques, NaOH is replaced with Ca (OH) 2, produces CaF2, CaSO3, CaSO4 precipitation in course of reaction simultaneously
Thing, to separate the salts substances such as fluoride, sulphite, sulfate.Polish RAFAKO using Steinmullerj technologies is public
Department thinks, using the solution of Ca (OH) 2, by adding the also precipitable CaCl2 separation Cl- of flocculant, flocculation aid.In addition, Germany
Company, substitutes Na2S to precipitate mercury, this technique using the TMT (Trimer~capto-trianzin) for equally having selection index system
It is relatively simple to operate.
At present seldom have been reported that propose complete set power plant desulfurization waste liquid technique of zero discharge, according to this present situation we
Every experimental study is carried out, the technique of zero discharge of the feasible power plant desulfurization waste liquid of complete set is have developed, thermal power generation is supplied
The desulfurization waste liquor that the wet desulphurization of factory is produced carries out zero discharge treatment.
Utility model content
Main purpose of the present utility model is a kind of power plant desulfurization zero emission method of wastewater of exploitation.
The utility model is achieved by following technical proposals：
A kind of processing unit of power plant desulfurization wastewater zero discharge, it is characterised in that including trigger crystallization apparatus, EDR devices,
Bipolar membrane device；
The desulfurization wastewater of power plant desulphurization system is connected with the import of crystallization apparatus is triggered, and triggers the sulphur produced by crystallization apparatus
Sour calcium crystal discharge, the product water out for crystallizing filter is connected with the import of EDR devices；
The dope outlet of EDR devices is divided into two-way, is connected with crystallization apparatus and bipolar membrane device is triggered respectively, water outlet
It is connected with power plant desulphurization system；
Acid ＆ alkali liquid discharge produced by bipolar membrane device is utilized.
Preferably, carrying one in initiation crystallization apparatus in a kind of processing unit of above-mentioned power plant desulfurization wastewater zero discharge
Individual agitator, while placing a diameter of 1-100 microns calcium sulfate crystal seed, concentration is every cubic metre 10-50 grams, and agitator is stirred
Speed is mixed for 2-50 per minute turns.The filter element of four fluorine ethylene hollow-fibre membranes is placed with the outlet of initiation crystallization apparatus,
The a diameter of 0.5-3mm of film, membrane aperture is 0.1-5 microns.
Preferably, the EDR devices in a kind of processing unit of above-mentioned power plant desulfurization wastewater zero discharge are equal frequently pole-reversings
Phase EDBM device, the frequency of falling pole is the 0.5-10 of falling pole times per hour, the film electricity of the homogeneous membrane anion and cation exchange membrane of use
Resistance 1-5 Ω/cm2, more than 96%, burst strength is 0.3-0.8MPa to the selectivity of film.
Preferably, the bipolar membranous system in a kind of processing unit of above-mentioned power plant desulfurization wastewater zero discharge uses three compartments
Bipolar membranous system.The characteristic that the Bipolar Membrane has is：Film resistance is 17 Ω/cm2, transmembrane voltage is 1.7V, and rupture strength is big
In 0.6MPa, thickness is 0.28mm, and selectivity is more than 97%；The characteristic of cavity block is：Film resistance is 18 Ω/cm2, transmembrane voltage is
0.3V, rupture strength is more than 0.3MPa, and thickness is 0.16mm, and selectivity is more than 98%；The characteristic of anode membrane is：Film resistance is 3.8
Ω/cm2, transmembrane voltage is 0.2V, and rupture strength is more than 0.3MPa, and thickness is 0.22mm, and selectivity is more than 98%；Anode is used
Titanium platinized electrode, negative electrode uses stainless steel electrode.Bipolar Membrane be able to can be adopted using the BP-1 Bipolar Membranes of Beijing court of a feudal ruler profit, negative and positive film
The ACM moistened with Beijing court of a feudal ruler hinders sour special cavity block CMB and hinders the special anode membrane of alkali.
Beneficial effect：The application can effectively realize zero-emission, and simple to operate, investment goods is also less, using into
This relatively low, popularization is easy.
Brief description of the drawings
Fig. 1 structural representations of the present utility model
Specific embodiment
Below in conjunction with the accompanying drawings, implementation of the present utility model is illustrated：
Embodiment 1
Structure shown in 1, designs a kind of processing unit of power plant desulfurization wastewater zero discharge with reference to the accompanying drawings, is tied including triggering
Brilliant device, EDR devices, bipolar membrane device；The desulfurization wastewater of power plant desulphurization system is connected with the import of crystallization apparatus is triggered, and triggers
Calcium sulphate crystal discharge produced by crystallization apparatus, the product water out for crystallizing filter is connected with the import of EDR devices；EDR
The dope outlet of device is divided into two-way, is connected with crystallization apparatus and bipolar membrane device is triggered respectively, water outlet and power plant desulfurization
System is connected；Acid ＆ alkali liquid discharge produced by bipolar membrane device is utilized.
In the present embodiment, assembling treating capacity is 1 ton per hour of power plant desulfurization waste water zero-emission device, triggers crystallization apparatus to exist
In one container with stirring, a diameter of 20 microns of calcium sulfate crystal seed is added, concentration is 10 grams every cubic metre, mixing speed
It is 10 turns per minute.Container outlet is filtered with four fluorine ethylene hollow-fibre membranes, a diameter of 1mm of film, and membrane aperture is 0.5 micro-
Rice.Frequently pole-reversing homogeneous membrane electrodialysis plant, the frequency of falling pole is pole 3 times per hour, the homogeneous membrane cation and anion exchange of use
3 Ω of the film resistance/cm of film2, more than 96%, burst strength is 0.5MPa to the selectivity of film.
Bipolar membranous system, the BP-1 Bipolar Membranes moistened using Beijing court of a feudal ruler using the bipolar membranous system of three compartments, Bipolar Membrane, negative and positive film
The sour special cavity block CMB resistances special anode membrane of alkali of ACM resistances moistened using Beijing court of a feudal ruler.Anode uses titanium platinized electrode, and negative electrode is using stainless
Steel electrode.
One calcium ion content is 8000mg/L, and sulfate radical content is 3000mg/L, and chloride ion content is 28000mg/L's
Desulfurization waste liquor enters our power plant desulfurization waste water zero-emission device.The concentrate of EDR enters Bipolar Membrane up to 10% concentration, and fresh water reaches
0.1% reuse.The acid concentration that Bipolar Membrane is produced is 6%, purity is 97%, and alkali concn is 8%, and purity is 98%；The sulphur of generation
Sour calcium crystal purity is more than 98.5%, and continuous operation 10 days is stable.
Embodiment 2
The flow according to Fig. 1, assembling treating capacity is 5 tons per hour of power plant desulfurization waste water zero-emission device, including triggers
Crystallization process, frequently pole-reversing electroosmosis system, bipolar membranous system.
Trigger crystallization apparatus, in a container with stirring, add a diameter of 10 microns of calcium sulfate crystal seed, concentration
It it is 20 grams every cubic metre, mixing speed is 20 turns per minute.Container outlet is filtered with four fluorine ethylene hollow-fibre membranes, and film is straight
Footpath is 1mm, and membrane aperture is 0.5 micron.Frequently pole-reversing homogeneous membrane electrodialysis plant, the frequency of falling pole is pole 2 times per hour, is used
Homogeneous membrane anion and cation exchange membrane 2.5 Ω of film resistance/cm2, more than 96%, burst strength is 0.6MPa to the selectivity of film.
Bipolar membranous system, the BP-1 Bipolar Membranes moistened using Beijing court of a feudal ruler using the bipolar membranous system of three compartments, Bipolar Membrane, negative and positive film
The sour special cavity block CMB resistances special anode membrane of alkali of ACM resistances moistened using Beijing court of a feudal ruler.Anode uses titanium platinized electrode, and negative electrode is using stainless
Steel electrode.The characteristic that wherein Bipolar Membrane has is：Film resistance is 17 Ω/cm2, transmembrane voltage is 1.7V, and rupture strength is more than
0.6MPa, thickness is 0.28mm, and selectivity is more than 97%；The characteristic of cavity block is：Film resistance is 18 Ω/cm2, transmembrane voltage is
0.3V, rupture strength is more than 0.3MPa, and thickness is 0.16mm, and selectivity is more than 98%；The characteristic of anode membrane is：Film resistance is 3.8
Ω/cm2, transmembrane voltage is 0.2V, and rupture strength is more than 0.3MPa, and thickness is 0.22mm, and selectivity is more than 98%；Anode is used
Titanium platinized electrode, negative electrode uses stainless steel electrode.
One calcium ion content is 10000mg/L, and sulfate radical content is 4000mg/L, and chloride ion content is 17000mg/L
Desulfurization waste liquor enter our power plant desulfurization waste water zero-emission device.The concentrate of EDR enters Bipolar Membrane, fresh water up to 8% concentration
Up to 0.1% reuse.The acid concentration that Bipolar Membrane is produced is 8%, purity is 95%, and alkali concn is 10%, and purity is 97%, continuous fortune
Row 10 days, the calcium sulphate crystal purity of generation is stable more than 98.5%.
Claims (6)
1. a kind of processing unit of power plant desulfurization wastewater zero discharge, it is characterised in that including triggering crystallization apparatus, EDR devices, double
Pole film device；
The desulfurization wastewater of power plant desulphurization system is connected with the import of crystallization apparatus is triggered, and triggers the calcium sulfate produced by crystallization apparatus
Crystal is discharged, and the product water out for crystallizing filter is connected with the import of EDR devices；
The dope outlet of EDR devices is divided into two-way, be connected with crystallization apparatus and bipolar membrane device is triggered respectively, water outlet with it is electric
Factory's desulphurization system connection；
Acid ＆ alkali liquid discharge produced by bipolar membrane device is utilized.
2. the processing unit of a kind of power plant desulfurization wastewater zero discharge according to claim 1, it is characterised in that trigger crystallization
An agitator is carried in device, while placing a diameter of 1-100 microns calcium sulfate crystal seed, concentration is every cubic metre of 10-50
Gram, the mixing speed of agitator is 2-50 per minute turns.
3. the processing unit of a kind of power plant desulfurization wastewater zero discharge according to claim 2, it is characterised in that trigger crystallization
The outlet of device is placed with the filter element of four fluorine ethylene hollow-fibre membranes, a diameter of 0.5-3mm of film, and membrane aperture is that 0.1-5 is micro-
Rice.
4. a kind of processing unit of power plant desulfurization wastewater zero discharge according to claim 1, it is characterised in that EDR devices
It is frequently pole-reversing homogeneous membrane electrodialysis plant, the frequency of falling pole is the 0.5-10 of falling pole time, the homogeneous membrane zwitterion of use per hour
The film resistance 1-5 Ω/cm of exchange membrane2, more than 96%, burst strength is 0.3-0.8MPa to the selectivity of film.
5. the processing unit of a kind of power plant desulfurization wastewater zero discharge according to claim 1, it is characterised in that described is double
Pole membranous system uses the bipolar membranous system of three compartments.
6. the processing unit of a kind of power plant desulfurization wastewater zero discharge according to claim 5, it is characterised in that described bipolar
The characteristic that film has is：Film resistance is 17 Ω/cm2, transmembrane voltage is 1.7V, and rupture strength is more than 0.6MPa, and thickness is
0.28mm, selectivity is more than 97%；The characteristic of cavity block is：Film resistance is 18 Ω/cm2, transmembrane voltage is 0.3V, and rupture strength is big
In 0.3MPa, thickness is 0.16mm, and selectivity is more than 98%；The characteristic of anode membrane is：Film resistance is 3.8 Ω/cm2, transmembrane voltage
It is 0.2V, rupture strength is more than 0.3MPa, and thickness is 0.22mm, and selectivity is more than 98%；Anode uses titanium platinized electrode, negative electrode
Using stainless steel electrode.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106517606A (en) * | 2016-11-27 | 2017-03-22 | 杭州水处理技术研究开发中心有限公司 | Treating apparatus capable of realizing zero discharge of desulphurization wastewater from power plant |
| US11502322B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
| US12040517B2 (en) | 2022-11-15 | 2024-07-16 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell and methods of use thereof |
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2016
- 2016-11-27 CN CN201621294191.8U patent/CN206279019U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517606A (en) * | 2016-11-27 | 2017-03-22 | 杭州水处理技术研究开发中心有限公司 | Treating apparatus capable of realizing zero discharge of desulphurization wastewater from power plant |
| US11502322B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11563229B1 (en) | 2022-05-09 | 2023-01-24 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US11611099B1 (en) | 2022-05-09 | 2023-03-21 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11699803B1 (en) | 2022-05-09 | 2023-07-11 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
| US12107308B2 (en) | 2022-05-09 | 2024-10-01 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11855324B1 (en) | 2022-11-15 | 2023-12-26 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell with heat pump |
| US12040517B2 (en) | 2022-11-15 | 2024-07-16 | Rahul S. Nana | Reverse electrodialysis or pressure-retarded osmosis cell and methods of use thereof |
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