CN108383310A - A kind of quenched desulfurization wastewater flue evaporation and cooperation-removal SO3Method - Google Patents
A kind of quenched desulfurization wastewater flue evaporation and cooperation-removal SO3Method Download PDFInfo
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- CN108383310A CN108383310A CN201810223958.5A CN201810223958A CN108383310A CN 108383310 A CN108383310 A CN 108383310A CN 201810223958 A CN201810223958 A CN 201810223958A CN 108383310 A CN108383310 A CN 108383310A
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- desulfurization wastewater
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- 239000002351 wastewater Substances 0.000 title claims abstract description 74
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 55
- 230000023556 desulfurization Effects 0.000 title claims abstract description 55
- 238000001704 evaporation Methods 0.000 title claims abstract description 21
- 230000008020 evaporation Effects 0.000 title claims abstract description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 87
- 238000004062 sedimentation Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000003546 flue gas Substances 0.000 claims abstract description 27
- 238000005352 clarification Methods 0.000 claims abstract description 25
- 239000002250 absorbent Substances 0.000 claims abstract description 13
- 230000002745 absorbent Effects 0.000 claims abstract description 13
- 239000006228 supernatant Substances 0.000 claims abstract description 11
- 150000002500 ions Chemical class 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000003607 modifier Substances 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 239000000725 suspension Substances 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 239000002817 coal dust Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000003463 adsorbent Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000009692 water atomization Methods 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- 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
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Treating Waste Gases (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention relates to a kind of quenched desulfurization wastewater flue evaporation and cooperation-removal SO3Method, including：Modifier treatment is carried out to desulfurization wastewater, is clarified to desulfurization wastewater and sodium hydroxide and flocculant is added in sedimentation basin, by the Ca in waste water2+、Mg2+Ion conversion is at sl. sol. Ca (OH)2With the Mg (OH) of indissoluble2, it is allowed to be deposited on clarification sedimentation basin bottom；The supernatant in sedimentation basin will be clarified through pumping or overflowing to lye pond, alkaline absorbent is added in lye pond, adjusts the pH value of waste water, solution will uniformly be injected to through metered dispensing unit in the flue before air preheater, the SO in cooperation-removal flue gas3.The present invention can realize desulfurization wastewater and SO3Integration removing, while simple for process, investment operating cost is low, and is generated without secondary waste object.
Description
Technical field
The invention belongs to technical field of waste water processing more particularly to a kind of quenched desulfurization wastewater flue evaporation and cooperation-removals
SO3Method.
Background technology
Desulfurization wastewater complicated component, the pollutant kind of coal-burning power plant wet desulfurization system discharge are more, be coal-burning power plant most
One of intractable waste water.The country mainly handles desulfurization wastewater using chemical precipitation method at present, and waste water is by neutralization, sedimentation and wadding
Direct emission after removing heavy-metal impurities is gone in solidifying processing.It is this that the directly outer mode arranged of high slat-containing wastewater is easily caused into secondary dirt
Dye.
Recent study produces a kind of new process using fume afterheat evaporation drying desulfurization wastewater.It is sprayed using two-phase flow
Mouth sprays into the flue between air preheater and electric precipitator, makes waste water evaporating completely using heat smoke after being atomized desulfurization wastewater,
Pollutant in waste water is converted into the solids such as crystal or salt, is collected by electric precipitator with the flying dust in flue gas,
To remove pollutant and realize the zero-emission of waste water.This technology investment operating cost is low, and technological process is simple, but deposits simultaneously
In some drawbacks.Such as Ca contained in waste water2+、Mg2+Ion be easy to cause the fouling of nozzle and spray gun, deteriorates waste water atomization
Effect；Under unit underload, flue-gas temperature reduces the evaporation effect for influencing waste water, and the evaporation of waste water droplet is not exclusively be easy to cause down
Swim the corrosion dust stratification of flue and deduster.On this basis, occur for desulfurization wastewater being atomized the flue before spraying into air preheater
In technique, while by mixing desulfurization wastewater with ground caustic, cooperation-removal SO may be implemented3Effect.
It discloses a kind of application No. is 201610265089.3 patent while handling SO in coal-fired plant flue gas3And desulfurization
The method of waste water arranges an evaporator on the flue between SCR reactors and air preheater, by desulfurization wastewater and alkalinity
The mixed slurries of absorbent uniformly spray to mix with flue gas at the top of evaporator handles coal-fired plant flue gas simultaneously to realize
Middle SO3And desulfurization wastewater.This process system degree of integration is high, and flow is simple, but Ca contained in waste water2+、Mg2+Ion is easy
Cause the blocking fouling of nozzle and spray gun, while alkaline adsorbent and Ca2+、Mg2+Ionic reaction is easy to generate precipitation, and aggravation is stifled
Fill in the tendency of fouling.
Application No. is 201710421541.5 patents to disclose a kind of SO3Removing is integrated with desulfurization wastewater zero-emission
Device and method will utilize ultrafiltration and reverse osmosis membrane processing after desulfurization wastewater flocculation sediment, the fresh water of generation is as sodium carbonate
Solvent, concentrated water mixed with sodium carbonate liquor spray into flue removing SO3.Although this technique has evaded Ca2+、Mg2+Ion causes
Nozzle spray gun blocks the risk of fouling, but technological process is more complicated, and investment operating cost is high, and can not solve to generate sludge
Follow-up handling problems.
Invention content
The object of the present invention is to provide a kind of quenched desulfurization wastewater flue evaporation and cooperation-removal SO3Method, with realize
Desulfurization wastewater and SO3Integration removing, while simple for process, investment operating cost is low, and is generated without secondary waste object.
The present invention provides a kind of quenched desulfurization wastewater flue evaporation and cooperation-removal SO3Method, including：
Modifier treatment is carried out to desulfurization wastewater, is clarified to desulfurization wastewater and sodium hydroxide and flocculant is added in sedimentation basin, it will
Ca in waste water2+、Mg2+Ion conversion is at sl. sol. Ca (OH)2With the Mg (OH) of indissoluble2, it is allowed to be deposited on clarification sedimentation basin bottom
Portion；
The supernatant in sedimentation basin will be clarified through pumping or overflowing to lye pond, alkaline absorbent is added in lye pond, adjusts
Solution is uniformly injected to through metered dispensing unit in the flue before air preheater, cooperation-removal flue gas by the pH value for saving waste water
In SO3。
Further, this method further includes：
Contain Ca (OH) by what clarification sedimentation basin bottom generated2With Mg (OH)2Deposit be discharged into through discharge pump it is slow to sludge
It rushes in case, and it is mixed with part clarification sedimentation basin supernatant, stirs and forms suspension, suspension is injected to air preheat
It is mixed with flue gas in flue before device or after air preheater, to promote SO in flue gas3Removing.
Further, this method further includes：
Contain Ca (OH) by what clarification sedimentation basin bottom generated2With Mg (OH)2Deposit after filter press is handled with coal dust
Multifuel combustion is carried out, Ca (OH) is made2With Mg (OH)2CaO and MgO are resolved into burner hearth high temperature, to remove the SO generated in flue gas3。
Further, the alkaline absorbent being added in lye pond is Na2CO3、NaOH、Na2SO3And NaHSO3In it is arbitrary
A kind of or combination.
Further, the amount for the alkaline absorbent being added in lye pond is according to SO in flue gas3Concentration determine, alkalinity inhale
Receive agent and SO in flue gas3Molar ratio be 2:1 to 4:1.
Further, the solution in lye pond uniformly sprays into flue along flue cross section.
Further, the solution in lye pond is sprayed into the form of twin or pressure atomization.
According to the above aspect of the present invention, passing through the evaporation of quenched desulfurization wastewater flue and cooperation-removal SO3Method, have following technology
Effect：
1) present invention while realizing desulfurization wastewater zero-emission, can at the same cooperation-removal flue gas in SO3, to keep away
Exempt from the generation for phenomena such as air preheater blocks, deduster corrodes and blue smoke.
2) present invention can completely avoid the secondary waste of processing desulfurization wastewater while realizing desulfurization wastewater zero-emission
Object generates.
3) present invention equally can with the HCl in cooperation-removal flue gas, to reduce the chloride ion content into desulfurizing tower, and
The yield of desulfurization wastewater is reduced from the root cause.
4) present invention process flow is simple and reliable, and investment operating cost is low.Compared with prior art, investment of the invention at
This is only SO3Removing sulfuldioxide and the investment of desulfurization wastewater zero-discharge technology are superimposed the 1/3 of cost hereinafter, both operating cost is superposition
1/2 or less cost.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, below with presently preferred embodiments of the present invention and after coordinating attached drawing to be described in detail such as.
Description of the drawings
Fig. 1 is a kind of quenched desulfurization wastewater flue evaporation of the present invention and cooperation-removal SO3One application implementation illustration of method.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
Present embodiments provide a kind of quenched desulfurization wastewater flue evaporation and cooperation-removal SO3Method, including：
Modifier treatment is carried out to desulfurization wastewater, is clarified to desulfurization wastewater and sodium hydroxide and flocculant is added in sedimentation basin, it will
Ca in waste water2+、Mg2+Ion conversion is at sl. sol. Ca (OH)2With the Mg (OH) of indissoluble2, and in clarification sedimentation basin bottom deposit
Get off；
The supernatant in sedimentation basin is clarified through pumping or overflowing to lye pond, alkaline absorbent is added in lye pond, will give up
The pH of water is adjusted to certain value, is then uniformly injected to solution through metered dispensing unit in the flue before air preheater and is cooperateed with
Remove the SO in flue gas3。
It can be while realizing desulfurization wastewater zero-emission by this method, the SO in cooperation-removal flue gas3, to avoid
The generation for phenomena such as air preheater blocks, deduster corrodes and blue smoke.HCl that equally can also be in cooperation-removal flue gas, to subtract
Enter the chloride ion content of desulfurizing tower less, and reduces the yield of desulfurization wastewater from the root cause.
The deposit that clarification sedimentation basin bottom generates is discharged into through discharge pump in sludge baffle-box, a large amount of because containing in deposit
The Ca (OH) of alkalinity2With Mg (OH)2, it can be formed a certain concentration by mixing part clarification sedimentation basin supernatant and stirring
Suspension, suspension is injected in the flue before air preheater or after air preheater, mixed with flue gas promote flue gas
Middle SO3Removing, or by deposit after filter press is handled with coal dust carry out multifuel combustion, make Ca (OH)2With Mg (OH)2In burner hearth
Pyrolytic is at CaO and MgO, to remove the SO generated in flue gas3.It, can by being handled and being recycled deposit
While realizing desulfurization wastewater zero-emission, the secondary waste object of processing desulfurization wastewater is avoided to generate completely.
In the present embodiment, the alkaline absorbent being added in lye pond is Na2CO3、NaOH、Na2SO3And NaHSO3In
One kind or combination.
In the present embodiment, the amount for the alkaline absorbent being added in lye pond is by SO in flue gas3Concentration determine, alkalinity
Absorbent and SO3Molar ratio range be 2:1 to 4:1.
In the present embodiment, the processing method of the suspension of the deposit formation of clarification sedimentation basin bottom is：It is injected to sky
Flue before air preheater sprays into the flue after air preheater and carries out three kinds of modes of multifuel combustion with coal dust after filter press is handled
Any one or combination.
In the present embodiment, penetrating mode of the solution in lye pond in flue is uniformly to be sprayed into along flue cross section, mist
Change mode is twin or pressure atomization.
Join shown in Fig. 1, Fig. 1 is the application implementation illustration for applying the present invention, and the device in Fig. 1 includes：It is buffer pool 1, clear
Clear sedimentation basin 2, lye pond 3, alkaline adsorbent storage box 4 and sludge baffle-box 5, buffer pool 1 are heavy with clarification by delivery pump P1
Shallow lake pond 2 connects, and clarification sedimentation basin 2 is connect by delivery pump P2 with lye pond 3, and lye pond 3 passes through delivery pump P3 and alkaline adsorption
Agent storage box 4 connects；Clarification sedimentation basin 2 passes sequentially through control valve V3 and discharge pump P7 is connect with sludge baffle-box 5, and sludge is slow
It rushes case 5 and is connected with control valve V4, flowmeter F3 and high-pressure pump P5 in turn；Lye pond 3 is connected with control valve V1, flowmeter F1 in turn
And high-pressure pump P4；Compression fan P6, control valve V2, flowmeter F2 are sequentially connected.
The desulfurization wastewater that wet desulfurization system generates is stored in first in buffer pool 1, has electric mixer in buffer pool 1
It carries out continuing stirring, waste water is discharged into through delivery pump P1 in clarification sedimentation basin 2, and sodium hydroxide and flocculation is added to clarification sedimentation basin 2
Agent, additive amount is by Ca in desulfurization wastewater2+、Mg2+Content determine.Supernatant in clarification sedimentation basin 2 is discharged into alkali by delivery pump P2
In liquid pool 3, at the same time, the adsorbent in alkaline adsorbent storage box 4 is added to by delivery pump P3 in lye pond 3, additive amount
With SO3Molar ratio range be 2:1 to 4:1.It is uniformly mixed wastewater supernatant fluid and adsorbent to form alkali in lye pond 3
Property solution, and uniformly sprayed by high-pressure pump P4 through control valve V1 and flowmeter F1 by transfer pipeline in the flue before air preheater, spray
It is to be mixed with the compressed air of compressed wind turbine P6, control valve V2 and flowmeter F2 to enter mode, is sprayed in the form of twin
Enter.In addition, the deposit in clarification sedimentation basin 2 is discharged into through control valve V3 and discharge pump P7 in sludge baffle-box 5, and continue to stir
Suspension is formed, suspension is injected to by high-pressure pump P5 before air preheater through control valve V4 and flowmeter F3 or air is pre-
In flue after hot device.
The quenched desulfurization wastewater flue evaporation provided in this embodiment of application below and cooperation-removal SO3Method combination Fig. 1,
By specific example, the invention will be further described.
The desulfurization wastewater that wet desulfurization system generates is stored in first in buffer pool 1, and the volume of buffer pool 1 is 200 vertical
Square rice meets one day desulfurization wastewater maximum emission of a 600MW unit.There is electric mixer to be continued in buffer pool 1
Stirring, waste water are discharged into through delivery pump P1 in clarification sedimentation basin 2, and the volume of clarification sedimentation basin 2 is 12 cubic metres, to clarification sedimentation basin
2 are added sodium hydroxide and polyacrylamide, and additive amount is respectively 250 kgs/hr and 2.5 kgs/hr, sedimentation time control
At 1 hour or so.Supernatant in clarification sedimentation basin 2 is discharged by delivery pump P2 in lye pond 3, and the volume in lye pond 3 is 12 vertical
Square rice.At the same time, the Na in alkaline adsorbent storage box 42CO3It is added in lye pond 3 by delivery pump P3, additive amount is
400 kgs/hr.It is uniformly mixed wastewater supernatant fluid and adsorbent to form alkaline solution in lye pond 3, and by delivery pipe
Road is uniformly sprayed into through control valve V1 and flowmeter F1 by high-pressure pump P4 in the flue before air preheater, and flowmeter F1 controls are
3000-5000 kgs/hr.Penetrating mode is to be mixed with the compressed air of compressed wind turbine P6, control valve V2 and flowmeter F2,
It is sprayed into the form of twin, atomizing particle size is 60 μm.In addition, the deposit in clarification sedimentation basin 2 through control valve V3 and
Discharge pump P7 is discharged into sludge baffle-box 5, and is continued stirring and formed suspension, by suspension through control valve V4 and flowmeter F3
It is injected to by high-pressure pump P5 in the flue before air preheater, behind eject position lye injection above, flowmeter F3 controls
It is made as 300 kgs/hr.
Present invention process flow is simple and reliable, and investment operating cost is low.Compared with prior art, cost of investment of the invention
Only SO3Removing sulfuldioxide and desulfurization wastewater zero-discharge technology invest the 1/3 of superposition cost hereinafter, operating cost is superimposed as the two
1/2 or less this.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of quenched desulfurization wastewater flue evaporation and cooperation-removal SO3Method, which is characterized in that including：
Modifier treatment is carried out to desulfurization wastewater, is clarified to desulfurization wastewater and sodium hydroxide and flocculant is added in sedimentation basin, by waste water
In Ca2+、Mg2+Ion conversion is at sl. sol. Ca (OH)2With the Mg (OH) of indissoluble2, it is allowed to be deposited on clarification sedimentation basin bottom；
The supernatant in sedimentation basin will be clarified through pumping or overflowing to lye pond, alkaline absorbent is added in lye pond, adjusted useless
Solution is uniformly injected to through metered dispensing unit in the flue before air preheater, in cooperation-removal flue gas by the pH value of water
SO3。
2. a kind of quenched desulfurization wastewater flue evaporation according to claim 1 and cooperation-removal SO3Method, feature exists
In further including：
Contain Ca (OH) by what clarification sedimentation basin bottom generated2With Mg (OH)2Deposit be discharged into sludge baffle-box through discharge pump
In, and it is mixed with part clarification sedimentation basin supernatant, stirs and forms suspension, before suspension is injected to air preheater
Or mixed with flue gas in the flue after air preheater, to promote SO in flue gas3Removing.
3. a kind of quenched desulfurization wastewater flue evaporation according to claim 1 and cooperation-removal SO3Method, feature exists
In further including：
Contain Ca (OH) by what clarification sedimentation basin bottom generated2With Mg (OH)2Deposit after filter press is handled with coal dust carry out
Multifuel combustion makes Ca (OH)2With Mg (OH)2CaO and MgO are resolved into burner hearth high temperature, to remove the SO generated in flue gas3。
4. a kind of quenched desulfurization wastewater flue evaporation according to claim 1 and cooperation-removal SO3Method, feature exists
In the alkaline absorbent being added in the lye pond is Na2CO3、NaOH、Na2SO3And NaHSO3In any one or group
It closes.
5. a kind of quenched desulfurization wastewater flue evaporation according to claim 4 and cooperation-removal SO3Method, feature exists
In the amount for the alkaline absorbent being added in the lye pond is according to SO in flue gas3Concentration determine, the alkaline absorbent with
SO in flue gas3Molar ratio be 2:1 to 4:1.
6. a kind of quenched desulfurization wastewater flue evaporation according to claim 1 and cooperation-removal SO3Method, feature exists
In the solution in the lye pond uniformly sprays into flue along flue cross section.
7. a kind of quenched desulfurization wastewater flue evaporation according to claim 6 and cooperation-removal SO3Method, feature exists
In the solution in the lye pond is sprayed into the form of twin or pressure atomization.
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| CN112209552A (en) * | 2020-09-28 | 2021-01-12 | 北京光耀环境工程有限公司 | Flue gas SO of thermal power plant3System and method for co-processing with desulfurization wastewater |
| CN112295385A (en) * | 2019-07-30 | 2021-02-02 | 中冶长天国际工程有限责任公司 | Tail gas purification and waste heat utilization method and device of hot blast stove for active carbon desorption |
| CN112604496A (en) * | 2020-12-30 | 2021-04-06 | 广东电网有限责任公司电力科学研究院 | System for removing hydrogen chloride and sulfur trioxide in flue gas in coordination with desulfurization wastewater |
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Application publication date: 20180810 |