CN109293062A - A kind of flue gas method recycles the device of calcium and magnesium in desulfurization wastewater - Google Patents
A kind of flue gas method recycles the device of calcium and magnesium in desulfurization wastewater Download PDFInfo
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- CN109293062A CN109293062A CN201811274307.5A CN201811274307A CN109293062A CN 109293062 A CN109293062 A CN 109293062A CN 201811274307 A CN201811274307 A CN 201811274307A CN 109293062 A CN109293062 A CN 109293062A
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- Prior art keywords
- magnesium
- calcium
- desulfurization wastewater
- flue gas
- aeration tank
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 39
- 239000002351 wastewater Substances 0.000 title claims abstract description 39
- 230000023556 desulfurization Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000003546 flue gas Substances 0.000 title claims abstract description 19
- 239000011777 magnesium Substances 0.000 title claims abstract description 17
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000011575 calcium Substances 0.000 title claims abstract description 15
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 15
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 14
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 23
- 239000012528 membrane Substances 0.000 claims abstract description 19
- 238000004064 recycling Methods 0.000 claims abstract description 13
- 230000001376 precipitating effect Effects 0.000 claims abstract 2
- 238000005273 aeration Methods 0.000 claims description 28
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Natural products O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 20
- 238000001556 precipitation Methods 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 16
- 239000001569 carbon dioxide Substances 0.000 claims description 11
- 230000003009 desulfurizing effect Effects 0.000 claims description 10
- 239000002244 precipitate Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 239000005864 Sulphur Substances 0.000 claims 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 22
- 239000000347 magnesium hydroxide Substances 0.000 abstract description 15
- 229910001862 magnesium hydroxide Inorganic materials 0.000 abstract description 15
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 11
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 9
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000003517 fume Substances 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000007781 pre-processing Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 14
- 229960004424 carbon dioxide Drugs 0.000 description 11
- 235000010216 calcium carbonate Nutrition 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000006228 supernatant Substances 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 235000011089 carbon dioxide Nutrition 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 229910001425 magnesium ion Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000008235 industrial water Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- -1 when pH is 10-12 Chemical compound 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention discloses the devices of calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater, belong to the waste water comprehensive reutilization of environmental technology field, desulfurization wastewater is carried out to be passed through the desulfurization fume equipped with carbon capture device after simply pre-processing, adds alkali using the magnesium hydroxide in tubular membrane recycling precipitating after removing calcium ion.The present invention both rationally utilized power-plant flue gas, while to wastewater minimisation emission reduction, reuse calcium carbonate recycles magnesium hydroxide, realizes the resource utilization of waste water, had certain economic value to the operation of power plant.
Description
Technical field
The present invention designs desulfurization wastewater processing technology field, and in particular to calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater
Device.
Background technique
Coal-burning power plant is industrial water rich and influential family, and water consumption and displacement account for 40% of industrial water consumption or more, and desulfurization is useless
Water zero discharge is important link water-saving in industry.In existing power plant process, constituent parts pass through power plant's cascade utilization with water
It is able to achieve and recycles, but there are still a part of waste water to efficiently use.
Desulfurization waste water quality main feature has: waste water is mainly weakly acidic, and water quality chloride ion and sulfate radical content are higher, right
Pipeline has certain corrosivity；Containing the suspended matter that a large amount of particles are tiny in waste water, calcium ions and magnesium ions concentration is higher, easily ties in the duct
Dirt.
Desulfurization wastewater zero-discharge technology technical way common at present includes film concentration and evaporative crystallization etc..Film
The advantages of concentration technique is that effluent quality is preferable, and most of water can reuse.Calcium-magnesium content in desulfurization wastewater, by desulfurization system
System influent quality, the factors such as lime stone kind influence and fluctuate it is larger, in 5000-12000mg/L or so.Using magnesium content compared with
When high lime stone, the magnesium ion content in waste water is higher, is on the one hand affected to follow-up equipment, on the other hand, if right
Magnesium is recycled, and can bring certain economic benefit for power plant.
Magnesium hydroxide is a kind of important magnesium chemical products, as one kind there is extremely strong cushion performance and efficient chemical to inhale
The alkaline agent of attached performance, has been to be concerned by more and more people.Traditional desulfuration waste water treatment process mainly adds calcium oxide and carbon
Sour sodium removes calcium ion, and poor filtration effect, sludge quantum of output is big, and ion can not recycle, waste water resource, higher cost.
Summary of the invention
The present invention is directed to the defect of prior art, provides the device of calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater, benefit
The calcium ion in desulfurization wastewater is removed with the flue gas after desulfurization after carbon dioxide capture device, while by calcium carbonate reuse
And using magnesium hydrate precipitate as byproduct recycle, can not only energy-saving and emission-reduction, reduce desulfurization wastewater hardness, avoid follow-up equipment
Fouling realizes the resource utilization of waste water.
In order to realize the above goal of the invention, the technical solution adopted by the present invention is as follows:
The present invention includes being connected to desulfurizing tower exhanst gas outlet by the aeration tank of pipeline connection, with the aeration tank liquid outlet
And the precipitation reaction pond for generating magnesium hydrate precipitate, the level-one pug processing dress with the aeration tank pug outlet
The second level pug processing unit set and be connected with the tubular membrane circulatory pool.
The technique that suspended particulate in water removal is removed using coagulant sedimentation, including water and medicament mixing, reaction and floccule body
With the separation three phases of water, precipitation reaction pond is that hybrid reaction process is combined in a kind of equipment completed in a structures.
The working principle in precipitation reaction pond is: raw water is passed through precipitation reaction pond, adds concentration and is the sodium hydroxide solution of 5wt%, and stirs
It mixes, reacts it in precipitation reaction pond sufficiently, solidliquid mixture, which is passed through in tubular membrane circulatory pool, realizes separation of solid and liquid.
As a further improvement of the present invention, two are provided on the pipeline between the desulfurizing tower exhanst gas outlet and aeration tank
Carbonoxide capturing device.Carbon dioxide capture device is washed by flue gas pretreatment system, packed absorber, filler regenerator, exhaust
Wash system, solution boiling device, amine recycling heater, product gas processing system (including condenser, gas-liquid separator, compressor)
And systematic water balance maintains system composition.The specific structure and working principle of the carbon dioxide capture device are that this field is general
The common knowledge that logical technical staff should learn, and the inventive point of its specific structure and non-present invention, therefore do not do herein specific superfluous
It states.
As a further improvement of the present invention, the aeration tank is connected with pretreatment unit.The pretreatment unit includes
Flocculation basin removes oil reactor, except ammonia nitrogen reactor and except COD reactor etc., primarily to removing the lime in desulfurization wastewater
The suspended particulates such as stone, gypsum particle and silica, remove oily substance, ammonia nitrogen and COD etc. will affect subsequent reactions and
The impurity of product purity, specific structure, connection type and the working principle of pretreatment unit are those of ordinary skill in the art
The common knowledge that should be learnt, and the inventive point of its specific structure and non-present invention, therefore do not do specifically repeat herein.
As a further improvement of the present invention, the aeration bottom of pond portion is provided with for passing through collecting carbonic anhydride for described
Gas after device is passed through the blower of aeration tank.
As a further improvement of the present invention, the level-one pug processing unit includes exporting to connect with the aeration tank pug
Logical level-one plate and frame filter press；The final products main component obtained after the level-one plate and frame filter press drying and dehydrating is
Calcium carbonate can continue reuse into desulphurization system.
As a further improvement of the present invention, the second level pug processing unit includes feed inlet and the precipitation reaction pond
The tubular membrane circulatory pool of discharge port connection；The water outlet communicating pipe film device of the tubular membrane circulatory pool；The tubular membrane dress
The mud mouth connection second level plate and frame filter press set, the water outlet of tubular type film device is connected to subsequent water treatment unit, by subsequent water
Processing unit further purifies water, and it is water process that the subsequent water treatment unit, which can be nanofiltration device or RO film device etc.,
The routine techniques of technique is not inventive point of the invention, and this will not be repeated here.By the concentration of tubular membrane, receive to greatest extent
Collect magnesium hydroxide, improves effluent quality, keep the processing of desulfurization wastewater next step highly efficient.
Compared with prior art, the present invention has the following technical effect that
It is reported that about 60% greenhouse effects are by CO2It generates, controls CO2Discharge become reply climate warming it is most important
One of technology path.Coal-burning power plant is CO2Primary discharge source, the whole world about 40%, China about 50% CO2Discharge carrys out spontaneous combustion
Coal-fired plant.Power plant CO2Discharge has the characteristics that stable, collection dosis neutralisata is big, is extensive emission reduction CO2The field of most significant.
Main component is CO in the flue gas of desulfurizing tower2, as source of carbonate ions, it is passed through in desulfurization wastewater, can not only removes
Calcium ion is removed, source of carbonate ions-carbonate cost in traditional technology is saved, moreover it is possible to carry out exhaust gas recycling, reduce dirty
Contaminate object discharge.
Desulfurization fume is passed through carbon capture device, CO can be improved2Purity, reduce aeration quantity, improve reaction efficiency, keep away
The defect and subsequent deimpurity complex process of the reduction of subsequent product purity are exempted from.
The present invention replaces traditional sedimentation basin using tubular membrane, separates magnesium hydroxide, magnesium hydroxide tool using film concentration technique
There is the features such as larger viscosity, wall easy to stick, film concentration technique maximizing recycles precipitated product, and high-efficient, and occupied area is small,
Aperture is small, and rejection is high, and effluent quality is good, keeps the processing of desulfurization wastewater next step highly efficient.
Detailed description of the invention
Fig. 1 is schematic structural diagram of the device of the invention；
Attached drawing 2 is process flow chart of the invention.
In figure: 1- desulfurizing tower；2- blower；The aeration tank 3-；4- level-one plate and frame filter press；5- precipitation reaction pond；6- tubular membrane
Circulatory pool；7- tubular membrane；8- carbon dioxide capture device；9- second level plate and frame filter press.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff every other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
The present invention includes passing through the aeration tank 3 of pipeline connection and 3 liquid outlet of aeration tank with 1 exhanst gas outlet of desulfurizing tower
Connection and the precipitation reaction pond 5 for generating magnesium hydrate precipitate, the level-one pug with the 3 pug outlet of aeration tank
Processing unit and the second level pug processing unit being connected with the tubular membrane circulatory pool 6.
Carbon dioxide capture device 8 is provided on pipeline between 1 exhanst gas outlet of desulfurizing tower and aeration tank 3.Dioxy
Change carbon capture device 8 by flue gas pretreatment system, packed absorber, filler regenerator, vent scrub system, solution boiling device,
Amine recycling heater, product gas processing system include that condenser, gas-liquid separator, compressor and systematic water balance maintain system
System composition.The specific structure and working principle of the carbon dioxide capture device 8 are that those of ordinary skill in the art should learn
Common knowledge, and the inventive point of its specific structure and non-present invention, therefore do not do specifically repeat herein.
The aeration tank 3 is connected with pretreatment unit.The pretreatment unit includes flocculation basin, removes oil reactor, except ammonia
Analysis and except COD reactor etc., primarily to removing lime stone, gypsum particle and the silica in desulfurization wastewater
Equal suspended particulates, removing oily substance, ammonia nitrogen and COD etc. will affect the impurity of subsequent reactions and product purity, pretreatment
Specific structure, connection type and the working principle of device are the common knowledges that those of ordinary skill in the art should learn, and
The inventive point of its specific structure and non-present invention, therefore do not do specifically repeat herein.
3 bottom of aeration tank is provided with for the gas after carbon dioxide capture device 8 to be passed through aeration
The blower 2 in pond 3.
The level-one pug processing unit includes the level-one plate and frame filter press 4 with the 3 pug outlet of aeration tank；Through
Cross the solid product obtained after the level-one plate and frame filter press 4 filters, the final products obtained after drying and dehydrating mainly at
It is divided into calcium carbonate, reuse can be continued into desulphurization system.
The second level pug processing unit includes the tubular membrane circulation that feed inlet is connected to 5 discharge port of precipitation reaction pond
Pond 6；The water outlet communicating pipe film device 7 of the tubular membrane circulatory pool 6；The mud mouth of the tubular type film device 7 connects second level
Plate and frame filter press 9.By the concentration of tubular membrane 7, magnesium hydroxide is collected to greatest extent, improves effluent quality, keeps desulfurization useless
The processing of water next step is highly efficient.
The application method of system of the present invention includes the following steps:
The preprocessed device of desulfurization wastewater in desulfurizing tower 1 is pre-processed, adjusts after pH is 8-8.5 and is passed through aeration tank
3；
Desulfurization tower flue gas is passed through progress air blast exposure in reaction system by blower 2 after carbon dioxide capture device 8
Gas generates precipitation of calcium carbonate, isolated precipitation of calcium carbonate and supernatant after fully reacting；Precipitation of calcium carbonate process and plate
It send into desulfurizing tower 1 after the dehydration of frame filter press as medicament reuse；
Supernatant is passed through in precipitation reaction pond 5, adds sodium hydroxide, and keeping pH is 10-12, and it is heavy to generate magnesium hydroxide
It forms sediment；It is passed through in tubular membrane circulatory pool 6, through 7 thickening filtration of tubular membrane, separates magnesium hydrate precipitate and supernatant；Supernatant enters
Subsequent processing units；
Above-mentioned magnesium hydrate precipitate is dehydrated by second level plate and frame filter press 9, obtains magnesium hydroxide products.
Embodiment 1:
As shown in Figure 1, the present embodiment includes the following steps:
By the preprocessed device pretreatment of desulfurization wastewater, lime stone, gypsum particle and the titanium dioxide in desulfurization wastewater are removed
The suspended particulates such as silicon, removing oily substance, ammonia nitrogen and COD etc. will affect the impurity of subsequent reactions and product purity, this reality
The initial pH of desulfurization wastewater for applying example is 5.5-6, and adjusting pH is 8.0-8.5, is reached with guaranteeing that subsequent flue gas is passed through rear calcium precipitate rate
80% or more；It is additionally added when pretreatment and recaptures agent removing heavy metal, pretreated desulfurization wastewater is then introduced into aeration tank 3
In；
Desulfurization tower flue gas is passed through progress air blast exposure in reaction system by blower 2 after carbon dioxide capture device 8
Gas generates precipitation of calcium carbonate, isolated precipitation of calcium carbonate and supernatant after fully reacting；Precipitation of calcium carbonate process and plate
It send into desulfurizing tower 1 after the dehydration of frame filter press as medicament reuse；The present embodiment aeration quantity meets n (Ca2+): n (CO2)=1:
1, when the calcium ion concentration in the present embodiment desulfurization wastewater is 2200mg/L, 8t desulfurization wastewater, aeration quantity exist per hour
10000m3/h can reach in pH8 compared with high calcium rate of deposition.The reaction that this process is related to such as formula is as follows:
Ca (OH) 2+CO2=CaCO3 ↓+H2O
Mg (OH) 2+CO2=MgCO3+H2O
Concentration is added in the supernatant in precipitation reaction pond 5 and is the sodium hydroxide of 5wt%, and keeping pH is 10-12, is generated
Magnesium hydrate precipitate；Solidliquid mixture is passed through in tubular membrane circulatory pool 6, and through 7 thickening filtration of tubular membrane, it is heavy to separate magnesium hydroxide
Shallow lake and supernatant；Supernatant enters in tubular type film device 7, and the water obtained after the concentration of tubular type film device 7 enters at subsequent water
Reason unit further purifies, it is made to meet industrial water standard；The reaction that this process is related to such as formula is as follows.
Mg2++2OH-=Mg (OH) 2 ↓
Ca2++2OH-=CaOH2
Mainly using magnesium hydroxide and calcium hydroxide, rate of deposition carries out further calcium ions and magnesium ions to this process at different pH
Separation, since the solubility product constant of magnesium hydroxide is less than calcium hydroxide, when pH is 10-12, magnesium hydroxide preferentially sinks
It forms sediment, calcium hydroxide is slightly soluble in water, achievees the purpose that separating calcium and magnesium with this.
Above-mentioned magnesium hydrate precipitate is passed through after second level plate and frame filter press 9 is dehydrated and obtains magnesium hydroxide products, through examining
It surveys, magnesium hydroxide products purity obtained by the present embodiment is greater than 99%.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (6)
1. the device of calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater, which is characterized in that it includes and desulfurizing tower (1) exhanst gas outlet
The precipitating of magnesium hydrate precipitate is connected to and is used to generate by the aeration tank (3) of pipeline connection, with the aeration tank (3) liquid outlet
Reaction tank (5), with the level-one pug processing unit of the aeration tank (3) pug outlet and with the precipitation reaction pond (5)
The second level pug processing unit being connected.
2. the device of calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater according to claim 1, which is characterized in that described de-
Carbon dioxide capture device (8) are provided on pipeline between sulphur tower (1) exhanst gas outlet and aeration tank (3).
3. the device of calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater according to claim 1, which is characterized in that the exposure
Gas pond (3) is connected with pretreatment unit.
4. the device of calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater according to claim 3, which is characterized in that the exposure
Gas pond (3) bottom is provided with the blower for the gas after carbon dioxide capture device (8) to be passed through to aeration tank (3)
(2)。
5. the device of calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater according to claim 1, which is characterized in that described one
Grade pug processing unit includes the level-one plate and frame filter press (4) with the aeration tank (3) pug outlet.
6. the device of calcium and magnesium in a kind of flue gas method recycling desulfurization wastewater according to claim 1, which is characterized in that described two
Grade pug processing unit includes the tubular membrane circulatory pool (6) that feed inlet is connected to precipitation reaction pond (5) discharge port；The pipe
The water outlet communicating pipe film device (7) of formula film circulatory pool (6)；The mud mouth of the tubular type film device (7) connects second level sheet frame
Filter press (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811274307.5A CN109293062A (en) | 2018-10-30 | 2018-10-30 | A kind of flue gas method recycles the device of calcium and magnesium in desulfurization wastewater |
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| CN201811274307.5A CN109293062A (en) | 2018-10-30 | 2018-10-30 | A kind of flue gas method recycles the device of calcium and magnesium in desulfurization wastewater |
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| CN107311373A (en) * | 2017-05-30 | 2017-11-03 | 毛强平 | The Zero-discharge treating process and device of a kind of power plant desulfurization wastewater |
| CN107619137A (en) * | 2017-10-10 | 2018-01-23 | 华北电力大学（保定） | The apparatus and method of calcium and magnesium in a kind of carbonizatin method recovery desulfurization wastewater |
| CN209338262U (en) * | 2018-10-30 | 2019-09-03 | 华北电力大学（保定） | A kind of flue gas method recycles the device of calcium and magnesium in desulfurization wastewater |
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| CN105060545A (en) * | 2015-07-17 | 2015-11-18 | 西安西热水务环保有限公司 | System and method for softening treatment of desulfurization wastewater of coal-fired power plant |
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| CN107311373A (en) * | 2017-05-30 | 2017-11-03 | 毛强平 | The Zero-discharge treating process and device of a kind of power plant desulfurization wastewater |
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