CN108467145A - A kind of less scaling desulfurizing waste water processing device and processing method - Google Patents
A kind of less scaling desulfurizing waste water processing device and processing method Download PDFInfo
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- 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
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- 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
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- 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
- C02F1/5281—Installations for water purification using chemical agents
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
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- 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
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Abstract
The present invention provides a kind of less scaling desulfurizing waste water processing devices and processing method, belong to technical field of environment protection equipment.It solves the problems, such as that existing desulfurization wastewater carries out softening pretreatment and causes operating cost high.Pending desulfurization wastewater is first passed through pretreating process and removes removing heavy metals and suspended material by this, after RESALT systems, the easily scale-forming ion of oversaturated calcium sulfate etc. in desulfurization wastewater is reconfigured and concentrated, two bursts of concentrated waters after RESALT recombination concentrations are respectively adopted the atomization of flue spray technique and spray into deduster front end smoke canal, through the heat of vaporization solidification in flue gas, the final concentrated water crystal that is atomized is discharged with the dry ash in deduster.The method of the present invention can make the not softened pretreatment of desulfurization wastewater realize zero-emission.
Description
Technical field
The invention belongs to technical field of environment protection equipment, be related to a kind of desulfurization wastewater processing equipment and method, more particularly to one
Kind less scaling desulfurizing waste water processing device and processing method.
Background technology
Ended for the end of the year 2016,10.5 hundred million kilowatts of national thermoelectricity installed capacity accounts for 64% (data of total installed capacity of electricity capacity
Source：Middle Electricity Federation publication《2016-2017 years, national power supply and demand situation analyzed prediction address》), coal burning will produce a system
Such as oxysulfide atmosphere pollution is arranged, and then generation acid rain etc. causes serious environmental problem, therefore necessary before flue gas emission
Desulfurization.Wet desulphurization and dry desulfurization are the common methods of flue gas desulfurization.Although dry desulfurization treatment process is simple, its efficiency
The shortcomings of not high and occupation area of equipment is wide limits its popularization and application.
The country is mainly wet desulphurization for fume desulphurization method, accounts for 90% or more total desulphurization system.Wet desulphurization efficiency
It is very high, and just capital investment is low, but desulfurization wastewater is one of the secondary pollution after coal-burning boiler dust treatment, main feature
It is salt content in 15000-45000mg/L, suspended matter is in 10000mg/L or more, SO4 2-In 4000mg/L or more, Ca2+In 1500-
5000mg/L, Mg2+In 3000-6000mg/L, Cl-Concentration is higher and leads to the strong (Filter Tuber For Clean Coal of corrosivity in acid (pH 4-6.5)
Technology, 2015,21 (2)：129-133).Desulfurization wastewater water is although less, but it is with high salt, concentration of suspension is high, easy fouling, easily
Generate secondary pollution, it is difficult to the problems such as stably reaching standard discharges so that desulfurization wastewater to be treated as one, power plant urgently to be resolved hurrily
Problem, therefore the technology for developing the zero-emission for being suitable for power plant desulfurization wastewater is very urgent.
Realize that desulfurization wastewater zero-emission mainly there are multiple technologies such as concentration and evaporation crystallization and flue spraying etc. at present.Because of desulfurization
Waste water hardness is higher, routine techniques in order to prevent concentrator and end solidification facility fouling, all needed in preprocessing process
Dual alkali softening is carried out, softening pharmaceutical quantities are big, and operating cost is high.
Invention content
The present invention first purpose be for existing desulfurization wastewater carry out softening pretreatment and cause run at
This high problem, and propose a kind of not softened pretreated desulfurizing waste water processing device.
First purpose of the present invention can be realized by following technical proposal：
A kind of less scaling desulfurizing waste water processing device, including pretreatment system, recombination concentration systems and atomization system,
The water inlet of pretreatment system is connected to wet type chimney exhaust desulfurization apparatus, water outlet and the recombination concentration systems of pretreatment system
Inlet communication, which is characterized in that there are three water outlets for the described recombination concentration systems tool, respectively export one, two and of outlet
Outlet three, which obtains strong brine one, dense salt after capable of being further processed the clear water with high salt obtained after pretreatment
Water two and reuse clear water, strong brine one, strong brine two and reuse clear water from above-mentioned outlet one, outlet two and export three one by one respectively
Corresponding discharge, water outlet one and outlet two are connected to by pipeline one and pipeline two with flue respectively, above-mentioned atomization system and pipeline
One is connected to pipeline two, and being used for will be in the strong brine atomizing spray to flue in pipeline one and pipeline two.
In a kind of above-mentioned less scaling desulfurizing waste water processing device, the pretreatment system include neutralization pond,
Reaction tank, flocculation basin, clarifying basin and tube microfiltration membrane, each section are sequentially communicated, and neutralization pond is vented desulfuration with above-mentioned wet type chimney
Device is connected to, and tube microfiltration membrane is connected to recombination concentration systems, and the neutralization pond is for neutralizing pH value, and reaction tank is for reacting
The sulfide of indissoluble is formed, flocculation basin is used to remove the heavy metal and suspended matter in waste water, and isolates supernatant, and clarifying basin is used
It is adjusted to neutrality in by waste water PH.
In a kind of above-mentioned less scaling desulfurizing waste water processing device, the recombination concentration systems are using dedicated
Variable-frequency pulse power supply and selectivity are formed through film.Recombination concentration systems can make sulfate radical, carbonate and calcium in clear water with high salt
Ion, magnesium ion are divided into 2 different channels outflows, release easy fouling tendency, obtain two strands it is less scaling and initial concentration
Strong brine.
Second object of the present invention be for existing desulfurization wastewater carry out softening pretreatment and cause operation at
This high problem, and propose a kind of not softened pretreated method for treating desulfurized wastewater.
Second, the mesh of the present invention is realized by following technical proposal：
A kind of less scaling method for treating desulfurized wastewater, which is characterized in that this method comprises the following steps：
S1, pending desulfurization wastewater is first pre-processed, deviates from heavy metal and suspended matter, obtains clear water with high salt；
S 2, by the clear water with high salt in S1 by obtaining reuse clear water and two strands less scaling after recombinating concentration systems processing
Strong brine one and strong brine two；
S3, by S2 strong brine one and strong brine two atomization spray into flue in；
S4, strong brine one and strong brine two are evaporated crystallization in flue；
Enter deduster with flue gas after S5, crystallization, is finally mixed in dry ash and is removed in solid form.
In a kind of above-mentioned less scaling method for treating desulfurized wastewater, the pretreatment includes the following steps：
S11, desulfurization wastewater is introduced in neutralization pond, and pH value adjustment control is later drawn waste water between 9.0-9.5
Enter to reaction tank；
S22, sulfide of the addition based on organic sulfur in reaction tank, the deposition of sulfides that reaction forms indissoluble get off,
Waste water is passed through flocculation basin again later；
S33, in flocculation basin, make heavy metal and suspended matter obtain removing and and separation of the supernatant；
S44, supernatant is introduced into clarifying basin, PH is adjusted to neutrality, clear water can be obtained in top, and clear water is pumped into tubular type micro-filtration
Film process completes pretreatment and obtains clear water with high salt；
In a kind of above-mentioned less scaling method for treating desulfurized wastewater, in the step S11, lime slurry is added
Adjust pH value.
In a kind of above-mentioned less scaling method for treating desulfurized wastewater, in the step S33, flocculant is added,
The particle in waste water is set to be deposited at bulky grain with coacervation of colloid, macromolecule flocculation aid is added in flocculation basin outlet, reinforcing particle
Growth process further promotes the precipitation of hydroxide and sulfide.
In a kind of above-mentioned less scaling method for treating desulfurized wastewater, the reuse clear water salt content concentration exists
Between 500-1500ppm.
In a kind of above-mentioned less scaling method for treating desulfurized wastewater, the strong brine one and strong brine two are distinguished
For sodium sulphate strong brine and chloride strong brine.
In a kind of above-mentioned less scaling method for treating desulfurized wastewater, the atomization system is by strong brine one and dense
Brine two is atomized into 40-60 μm of fine droplet.
In a kind of above-mentioned less scaling method for treating desulfurized wastewater, the atomization system requires air compressor
Pressure is in 0.65-0.75MPa.
Compared with prior art, less scaling desulfurizing waste water processing device and processing method of the invention passes through to desulfurization
Waste water is pre-processed, and settleable solids are removed, and the RESALT under electric drive effect is recycled to recombinate concentration systems to fouling tendency
The recombination concentration of calcium sulfate waste water, chemically angle solve fouling problem of the calcium sulfate on film and evaporator, without adding volume
Outer chemical medicament, a step realize that the desalination of desulfurization wastewater, high power concentration and concentrated water divide salt, and operating cost is low, can quickly cope with
The fluctuation of water quality, and generated without sludge, it is atomized on flue finally by spray system and sprays into concentrated water, tiny particle concentrated water profit
It is evaporated to obtain crystal salt with the high temperature of flue, is arranged outside the dry ash that crystal salt is collected with deduster, realize desulfurization wastewater zero-emission
The target put.
Description of the drawings
Fig. 1 is less scaling desulfurizing waste water processing device schematic diagram.
Specific implementation mode
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
As shown in Figure 1, this less scaling desulfurizing waste water processing device includes pretreatment system, recombination concentration systems and mist
Change system, this desulfurizing waste water processing device are used cooperatively with boiler flue gas treatment system, and desulfuration is vented in boiler and wet type chimney
On flue between device (WFGD), it is also provided with electric precipitator (ESP).
Pretreatment system includes neutralization pond, reaction tank, flocculation basin, clarifying basin and tube microfiltration membrane, and each section is sequentially communicated,
Neutralization pond is connected to above-mentioned wet type chimney exhaust desulfurization apparatus, and tube microfiltration membrane is connected to recombination concentration systems.Recombination concentration system
Uniting, there are three water outlets for (RESALT) tool, respectively export one, outlet two and outlet three, and water outlet one and outlet two pass through respectively
Pipeline one and pipeline two are connected to flue, and above-mentioned atomization system is connected to pipeline one and management two.
Included the following steps using the method that above-mentioned desulfurizing waste water processing device carries out desulfurization wastewater processing：
S1, WFGD Limestone-gypsum Wet Flue Gas Desulfurization Process generate desulfurization wastewater because of the accumulation of chlorion；
S2, the desulfurization wastewater by salt content in 2-4% introduce in neutralization pond, are controlled pH by adding lime slurry
9.0-9.5 between, Fe can be removed3+、Zn2+、Cu2+、Ni2+Deng most of heavy metal ion, while lime slurry can also be with waste water
In F-Reaction, and Pb2+、Hg2+Still exist in waste water in the form of an ion in neutralization pond, waste water is introduced to reaction tank later；
S3, it is added in reaction tank with organic sulfur, the deposition of sulfides that reaction forms indissoluble gets off, later again leads to waste water
Enter flocculation basin；
S4, in flocculation basin, so that heavy metal and suspended matter is removed and and separation of the supernatant；Heavy metal is by neutralization pond and instead
Sedimentation basin is answered to be removed, however there are many more tiny and dispersion particle and colloid, it needs, by adding flocculant, to make it
Coacervating large particle and deposit, flocculation basin export be added macromolecule flocculation aid, the growth process of reinforcing particle, into one
Step promotes the precipitation of hydroxide and sulfide；
S5, supernatant is introduced into clarifying basin, PH is adjusted to neutrality, clear water can be obtained in top, and most of sludge is through sludge
Pump is discharged to mortar pool, and fraction sludge can be used as contact sludge to return to waste water reaction pond, and clear water is passed through water tank；
Clear water in water tank is pumped into tube microfiltration membrane processing with water pump, completes pretreatment and obtain clear water with high salt by S6；
S7, reuse clear water (salt content is obtained after handling the clear water with high salt in S6 by recombination concentration systems (RESALT)
In 500-1500ppm) and two strands of less scaling strong brines one and strong brine two, strong brine one and strong brine two are respectively sulfuric acid
Sodium strong brine and chloride strong brine (mainly calcium chloride, magnesium chloride etc.), the salt content and water and strong brine of recycle-water
Should spray according to flue admissible water of water be designed；
Strong brine one and strong brine two in S8, S7 are discharged by pipeline one and pipeline two respectively, are atomized through atomization system
It is sprayed into respectively at 40-60 μm of fine droplet in the flue of deduster leading portion, atomization system requires air compressor pressure to exist
0.65-0.75MPa；
S9, strong brine one and strong brine two are evaporated crystallization in flue, spray into positional distance deduster entrance in 10-
15m；
Enter deduster with flue gas after S10, crystallization, is finally mixed in dry ash and is removed in solid form.
It should be understood that in claims of the present invention, specification, all " including ... " should be understood as open
Meaning, that is, its meaning is equal to " at least containing ... ", and should not be construed as enclosed meaning, i.e., its meaning is not answered
This is interpreted as " only including ... ".
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. a kind of less scaling desulfurizing waste water processing device, including pretreatment system, recombination concentration systems and atomization system, in advance
The water inlet of processing system is connected to wet type chimney exhaust desulfurization apparatus, water outlet and the recombination concentration systems of pretreatment system
Inlet communication, which is characterized in that there are three water outlets for the recombination concentration systems tool, respectively export one, outlet two and go out
Mouth three, which obtains strong brine one, strong brine after capable of being further processed the clear water with high salt obtained after pretreatment
Two and reuse clear water, strong brine one, strong brine two and reuse clear water are a pair of from above-mentioned outlet one, outlet two and outlet 31 respectively
It should be discharged, water outlet one and outlet two are connected to by pipeline one and pipeline two with flue respectively, above-mentioned atomization system and pipeline one
It is connected to pipeline two, being used for will be in the strong brine atomizing spray to flue in pipeline one and pipeline two.
2. a kind of less scaling desulfurizing waste water processing device according to claim 1, which is characterized in that the pre- place
Reason system includes neutralization pond, reaction tank, flocculation basin, clarifying basin and tube microfiltration membrane, and each section is sequentially communicated, neutralization pond with it is above-mentioned
Wet type chimney is vented desulfurization apparatus connection, and tube microfiltration membrane is connected to recombination concentration systems, and the neutralization pond is for neutralizing PH
Value, for reacting the sulfide for forming indissoluble, flocculation basin is used to remove the heavy metal and suspended matter in waste water reaction tank, and detaches
Go out supernatant, clarifying basin is for waste water PH to be adjusted to neutrality.
3. a kind of less scaling desulfurizing waste water processing device according to claim 1 or 2, which is characterized in that described
Concentration systems are recombinated to form through film using dedicated variable-frequency pulse power supply and selectivity.
4. a kind of less scaling method for treating desulfurized wastewater, is handled, feature using above-mentioned desulfurizing waste water processing device
It is, this method comprises the following steps：
S1, pending desulfurization wastewater is first pre-processed, deviates from heavy metal and suspended matter, obtains clear water with high salt；
S2, reuse clear water and two strands of less scaling dense salt are obtained after handling the clear water with high salt in S1 by recombination concentration systems
Water one and strong brine two；
S3, by S2 strong brine one and strong brine two atomization spray into flue in；
S4, strong brine one and strong brine two are evaporated crystallization in flue；
Enter deduster with flue gas after S5, crystallization, is finally mixed in dry ash and is removed in solid form.
5. a kind of less scaling method for treating desulfurized wastewater according to claim 4, which is characterized in that the pre- place
Reason includes the following steps：
S11, desulfurization wastewater is introduced in neutralization pond, and waste water is introduced to by pH value adjustment control later between 9.0-9.5
Reaction tank；
S22, sulfide of the addition based on organic sulfur in reaction tank, the deposition of sulfides that reaction forms indissoluble get off, later
Waste water is passed through flocculation basin again；
S33, in flocculation basin, make heavy metal and suspended matter obtain removing and and separation of the supernatant；
S44, supernatant is introduced into clarifying basin, PH is adjusted to neutrality, clear water can be obtained in top, and clear water is pumped at tube microfiltration membrane
Reason completes pretreatment and obtains clear water with high salt.
6. a kind of less scaling method for treating desulfurized wastewater according to claim 5, which is characterized in that the step
In S11, addition lime slurry adjusts pH value.
7. a kind of less scaling method for treating desulfurized wastewater according to claim 5, which is characterized in that the step
In S33, flocculant is added, the particle in waste water is made to be deposited at bulky grain with coacervation of colloid, macromolecule is added in flocculation basin outlet
Flocculation aid, the growth process of reinforcing particle further promote the precipitation of hydroxide and sulfide.
8. a kind of less scaling method for treating desulfurized wastewater according to claim 4, which is characterized in that the reuse
Clear water salt content concentration is between 500-1500ppm.
9. a kind of less scaling method for treating desulfurized wastewater according to claim 4, which is characterized in that the dense salt
Water one and strong brine two are respectively sodium sulphate strong brine and chloride strong brine.
10. a kind of less scaling method for treating desulfurized wastewater according to claim 4, which is characterized in that the mist
Strong brine one and strong brine two are atomized into 40-60 μm of fine droplet by change system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110759567A (en) * | 2019-10-22 | 2020-02-07 | 武汉天空蓝环保科技有限公司 | Chloride ion passivator, preparation method and desulfurization wastewater treatment method |
| CN115572016A (en) * | 2022-10-27 | 2023-01-06 | 佛山恒益热电有限公司 | Thermal power plant high-salt-content wastewater direct injection hearth treatment process and device |
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| CN208265947U (en) * | 2018-04-17 | 2018-12-21 | 浙江大维高新技术股份有限公司 | A kind of less scaling desulfurizing waste water processing device |
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| CN106365371A (en) * | 2016-11-04 | 2017-02-01 | 山东山大华特环保工程有限公司 | Desulfurization waste water zero discharge processing system and processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110759567A (en) * | 2019-10-22 | 2020-02-07 | 武汉天空蓝环保科技有限公司 | Chloride ion passivator, preparation method and desulfurization wastewater treatment method |
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