CN106882893A - A kind of carbon dioxide recycle in utilization flue gas softens method for waste water and device - Google Patents
A kind of carbon dioxide recycle in utilization flue gas softens method for waste water and device Download PDFInfo
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- CN106882893A CN106882893A CN201710240968.5A CN201710240968A CN106882893A CN 106882893 A CN106882893 A CN 106882893A CN 201710240968 A CN201710240968 A CN 201710240968A CN 106882893 A CN106882893 A CN 106882893A
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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
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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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F2001/007—Processes including a sedimentation step
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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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- 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
Abstract
The present invention relates to Thermoelectric Power Station Desulphurization Wastewater Processing Technology field, and in particular to the carbon dioxide recycle in a kind of utilization flue gas softens method for waste water and device.The adjusted preliminary sedimentation of power plant desulfurization waste water obtains clarified solution, adding lime to carry out neutralization hair in clarified solution should, adding PAC in the solution again carries out flocculation reaction, the solution of flocculation reaction is entered into sedimentation basin again, the solid particle sludge in solution is precipitated in sedimentation basin, clarification and effluent after precipitation is circulated softening reaction into cyclic softening reaction tank, complete reacted solution carries out separation of solid and liquid into ceramic membrane, ceramic membrane concentrated water enters sludge concentration tank, ceramic membrane produces water and is concentrated into reverse osmosis membrane, 60% RO is produced to produce Water circulation, produce 40% RO concentrated waters to be evaporated by bypass flue and realize desulfurization wastewater zero-emission.Rationally efficiently, its apparatus structure is ingenious rationally for the method for the present invention.
Description
Technical field
The present invention relates to Thermoelectric Power Station Desulphurization Wastewater Processing Technology field, and in particular to the carbon dioxide in a kind of utilization flue gas
Cyclic softening method for waste water and device.
Background technology
Thermoelectricity as a kind of technology maturation, reliable, cost economy generation technology, the direct join of thermoelectricity one using it is long-term as
Important component in China's energy resource structure.As economic continues to develop, China's thermoelectricity installed capacity rises rapidly, and fiery
The environmental problem that electricity triggers also increasingly triggers everybody to pay close attention to.The desulfurization wastewater of thermal power plant is due to complicated component, and treatment technology is difficult
Degree is big, is that coal-burning power plant concentrates one of most intractable waste.Contain contents of many kinds of heavy metal ion, and concentration pole in desulfurization wastewater
Calcium high, magnesium, sulfate radical and chlorion.The treatment of traditional desulfurization wastewater is generally got rid of various heavy in water using chemical precipitation method
Metal ion, but this method is costly, and cannot effectively remove calcium, magnesium ion in waste water.With China's correlation environmental requirement
Improve, the traditional chemical precipitation method will be hard to carry on.Therefore, the further treatment technique of desulfurization wastewater is developed, will be as China from now on
One emphasis problem of water treatment field.
The removal of a large amount of calcium ions and magnesium ions in water, its conventional processes add soda ash or " Dual alkali " to process for milk of lime.By
In desulfurization wastewater contain a large amount of magnesium ions, this method need add large quantities of lime, the calcium ion brought into lime with need
To be removed by adding soda ash so that softening process treatment desulfurization wastewater cost is very high.Meanwhile, the department such as power plant daily can be to environment
The middle a large amount of flue gases of discharge, containing the carbon dioxide of 15~18% concentration in this flue gas, and temperature is up to 80 degree or so.Titanium dioxide
Carbon is the major pollutants for causing greenhouse effects, while substantial amounts of high-temperature flue gas can also cause environmental thermal pollution.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of carbon dioxide recycle that can effectively utilize in flue gas
Soften method for waste water and device, rationally efficiently, its apparatus structure is ingenious rationally for the method.
To achieve the above object, one of scheme that the present invention is provided softens for the carbon dioxide recycle in a kind of utilization flue gas
The method of waste water, comprises the following steps：
The adjusted preliminary sedimentation of power plant desulfurization waste water obtains clarified solution, adds lime to carry out neutralization hair in clarified solution and answers, in regulation solution
PH value to 9.5 ~ 11.5,
Adding PAC in the solution again carries out flocculation reaction, removes tiny suspended particulate substance, then the solution of flocculation reaction is entered into heavy
Shallow lake pond,
The solid particle sludge in solution is precipitated in sedimentation basin,
Clarification and effluent after precipitation is circulated softening reaction into cyclic softening reaction tank,
Complete reacted solution enters micro-filtrate membrane filtration, carries out separation of solid and liquid, and microfiltration membranes concentrated water enters sludge concentration tank, micro-filtration
Film produces water and is concentrated into reverse osmosis membrane, produces 60% RO to produce Water circulation, produces 40% RO concentrated waters to evaporate real by bypass flue
Existing desulfurization wastewater zero-emission.
Further, the neutralization reaction time be 1 ~ 2 hour so that the magnesium ion content in clarified solution drop to 500ppm with
Under, sulfate ion content drops to below 5000ppm.
Further, the flocculation reaction time is 15 ~ 60 minutes so that the magnesium ion content in clarified solution drops to 500ppm
Hereinafter, sulfate ion content drops to below 5000ppm.
Further, precipitated 2 ~ 4 hours in sedimentation basin, the sludge in sedimentation basin enters after sludge concentration tank is concentrated through sheet frame
Filter press dehydration is collected.
Further, the reaction time of the cyclic softening reaction 1 ~ 2 hour, introduces the ultra micro rice that flue gas is produced
Carbon dioxide bubble makes the carbon dioxide in waste water and bubble highly mix hybrid reaction.When pH value of solution in cyclic softening reaction tank
During value≤9, then cyclic softening reaction tank is returned into the flue gas recirculation after hybrid reaction and produce carbon dioxide bubble；When cyclic softening is anti-
In Ying Chi during solution ph ＞ 9, then the flue gas after hybrid reaction is expelled directly out outside cyclic softening reaction tank, it is completely reacted
Solution (i.e. after the reaction time of 1-2 hours) enters micro-filtrate membrane filtration, carries out separation of solid and liquid, and microfiltration membranes concentrated water enters sludge
Concentration basin, microfiltration membranes are produced water and are concentrated into reverse osmosis membrane, and 60% RO produces Water circulation, and 40% RO concentrated waters are evaporated by bypass flue
Realize desulfurization wastewater zero-emission.
Further, the cyclic softening reaction tank includes a hermetically sealed housing and a bubble generator, divides on the housing
The dosing import of water inlet, delivery port, pH buffer is not provided with, and the dosing import of pH buffer is provided with pH buffer dosing and opens
Close, housing inner bottom part is provided with the bubble formation outlet of bubble generator, the bubble formation outlet of the bubble generator and housing
Bubble entrance be connected, pH detection probes are provided with housing, pH detection probes go deep into solution in housing, the housing inner top
Gas circulation collection port is provided with, flue gas outlet pipe is connected with the gas circulation collection port, flue gas outlet pipe is provided with
Exhanst gas outlet is switched, and smoke inlet pipe road is connected with the bubble generator, and smoke inlet pipe road is provided with smoke inlet and opens
Close, with flue gas outlet pipe by flue gas recirculation pipeline communication, flue gas recirculation pipeline is provided with flue gas in the smoke inlet pipe road
Cycling switch, pH detection probes and exhanst gas outlet switch, smoke inlet switch, pH buffer dosing switch gearing start and stop.
Further, when pH value of solution≤9 in housing, smoke inlet switch is closed, and exhanst gas outlet switch is closed, flue gas
Cycling switch is opened, and reacted flue gas recirculation enters cyclic softening reaction tank；During pH ＞ 9, smoke inlet switch open, flue gas
Cycling switch is closed, exhanst gas outlet switch open, and reacted flue gas is arranged from cyclic softening reaction tank is directly outer；
When solution ph≤8 in solution in housing, pH buffer dosing switch open adds pH in cyclic softening reaction tank
Buffer is reacted；As pH value of solution ＞ 8 in solution in housing, pH buffer dosing switch is closed, and is stopped to cyclic softening
PH buffer is added in reaction tank；
The pH buffer presses 1 ~ 10 by the one or both of NaOH and ammonium carbonate：1 ratio is constituted.
Further, bubble average grain diameter 200nm ~ 4um that the bubble generator is produced, bubble inclusion rate more than 80%,
The average rate of climb of bubble is in 2 ~ 10mm/s.
Further, in micro-filtrate membrane filtration, the solid content of waste water is processed（Can not filter residual miscellaneous）It is 3% ~ 6%, microfiltration membranes
In 0.2 ~ 1um, microfiltration membranes are one kind of organic film or inoranic membrane in aperture, and the reverse osmosis membrane that reverse osmosis membrane concentration is used is volume
Formula, flat board, butterfly or ductwork type, the evaporator of the steamed journey of bypass flue use energy-efficient bypass flue crystallizing evaporator.
Further, microfiltration membranes are produced water calcium ions and magnesium ions total content and are down to below 100ppm.
Another program that the present invention is provided is a kind of device of the carbon dioxide recycle softening waste water in utilization flue gas, including
It is wastewater equalization pond, neutralization reaction pond, flocculation basin, sedimentation basin, cyclic softening reaction tank, micro-filtration membrane concentration pond, micro-filtration film device, micro-
Filter membrane produces water tank, reverse osmosis unit, reverse osmosis concentrated water tank（10）, bypass flue vaporising device and reverse osmosis produced water collection tank, institute
State wastewater equalization pond outlet to be connected with neutralization reaction pond entrance, neutralization reaction pond delivery port is connected with flocculation basin entrance, flocculation basin
Delivery port is connected with sedimentation basin, and clarifier sludge floss hole is connected with sludge concentration tank, and sludge concentration tank spoil disposal is exported and press filtration
Machine is connected, and the outlet of sedimentation basin clarified solution is connected with cyclic softening reaction tank entrance, and cyclic softening reaction tank is also associated with titanium dioxide
Carbon bubble generator, cyclic softening reaction tank outlet is connected with micro-filtration membrane concentration pond, and micro-filtration membrane concentration pond and micro-filtration film device are dense
Water out is connected, and micro-filtration film device produces water out and connects microfiltration membranes product water tank, and microfiltration membranes are produced water tank and are connected with reverse osmosis unit, reverse osmosis
Saturating device produces water out and connects reverse osmosis produced water collection water tank, and the outlet of reverse osmosis unit concentrated water connects reverse osmosis concentrated water case, reverse osmosis concentrated
Water tank is connected with bypass flue vaporising device.
Further, also including pH buffer chemicals dosing plant, the pH buffer chemicals dosing plant and cyclic softening reaction tank
PH buffer dosing mouth is connected.
Further, also including PAC chemicals dosing plants, flocculation basin dosing mouth connection PAC chemicals dosing plants.
Further, also including calcium hydroxide chemicals dosing plant, neutralization reaction pond dosing mouth connection calcium hydroxide chemicals dosing plant.
It is different from prior art, above-mentioned technical proposal has the beneficial effect that：
Gimmickery structure and rational process are devised in the present invention, is de- using the carbon dioxide in power-plant flue gas
Sulphur waste water provides abundant carbonate, is reacted with the desulfurization wastewater through lime treatment, the calcium ion further gone in water removal.From
And cause that calcium ion removes out with calcium carbonate form from water.The method and device can be greatly reduced calcium ion and remove into
This.
Brief description of the drawings
Fig. 1 is the method flow diagram of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the carbon dioxide recycle softening plant of the embodiment of the present invention 1.
Fig. 3 is the apparatus structure schematic diagram of the embodiment of the present invention 2.
Description of reference numerals：
Regulating reservoir 1, reaction tank 2, flocculation basin 3, sedimentation basin 4, cyclic softening reaction tank 5, micro-filtration membrane concentration pond 6, micro-filtration film device
7, microfiltration membranes produce water tank 8, and reverse osmosis unit 9, reverse osmosis concentrated water tank 10, bypass flue vaporising device 11, reverse osmosis produced water is collected
Water tank 12, sludge concentration tank 13, filter press 14, calcium hydroxide chemicals dosing plant 15, PAC chemicals dosing plants 16, pH buffer dosing dress
Put 17, carbon dioxide bubble generator 18.
Specific embodiment
To describe technology contents, structural feature, the objects and the effects of technical scheme in detail, below in conjunction with specific reality
Apply example and coordinate accompanying drawing to be explained in detail.
Embodiment 1：
Fig. 1 and Fig. 2 is referred to, the method that the carbon dioxide recycle in a kind of utilization flue gas of the present embodiment 1 softens waste water, including
Following steps：
1. the adjusted preliminary sedimentation of power plant desulfurization waste water obtains clarified solution.
2. add lime to carry out neutralization hair in clarified solution to answer, the pH value in solution is adjusted to 9.5 ~ 11.5, during neutralization reaction
Between be 1 ~ 2 hour so that the magnesium ion content in clarified solution drops to below 500ppm, and sulfate ion content drops to
Below 5000ppm.
3. adding PAC in the solution again carries out flocculation reaction, removes tiny suspended particulate substance, and in the present embodiment, flocculation is anti-
It is 15 ~ 60 minutes between seasonable.
4. the solution of flocculation reaction is entered into sedimentation basin again, the solid particle sludge in solution is sunk in sedimentation basin
Form sediment, the sludge in many 2 ~ 4 hours sedimentation basins of sedimentation basin precipitation enters to be dehydrated through plate and frame filter press after sludge concentration tank is concentrated to be collected.
5. the clarification and effluent after precipitating is circulated softening reaction into cyclic softening reaction tank, molten in reaction tank when softening
During liquid pH value≤9, then reacted flue gas recirculation is entered into cyclic softening reaction tank and produce carbon dioxide bubble；Reacted when softening
In pond during solution ph ＞ 9, then reacted flue gas is expelled directly out outside cyclic softening reaction tank.Sedimentation basin clarified solution enters soft
Change pond to soften, entering carbon dioxide bubble generator using the carbon dioxide in flue gas generates carbon dioxide bubble, makes waste water molten
Liquid and the generation precipitation of calcium carbonate of carbon dioxide high uniformity hybrid reaction, reach the purpose for softening waste water.Carbon dioxide gas
Bubble average grain diameter 200nm ~ 4um that bubble generator is produced, bubble inclusion rate more than 80%, the average rate of climb of bubble 2 ~
10mm/s。
With reference to shown in Fig. 2, the cyclic softening reaction tank includes an a hermetically sealed housing A and bubble generator B, the housing
The dosing import E of water inlet C, delivery port D, pH buffer is respectively equipped with A, the dosing import E of pH buffer is provided with pH and delays
Electuary dosing is switched, and housing A inner bottom parts are provided with the bubble formation outlet of bubble generator B, the bubble life of the bubble generator B
It is connected with the bubble entrance of housing A into outlet, pH detection probes F, pH detection probe F is provided with housing A and gos deep into molten in housing A
Liquid, the housing A inner tops are provided with gas circulation collection port G, and flue gas outlet pipe is connected with the gas circulation collection port G
H, flue gas outlet pipe H are provided with exhanst gas outlet switch J, and smoke inlet pipe road K, flue gas are connected with the bubble generator B
Admission line K is provided with smoke inlet switch L, the smoke inlet pipe road K and flue gas outlet pipe H and passes through flue gas recirculation pipeline
M is connected, and flue gas recirculation pipeline is provided with flue gas recirculation switch N, pH detection probes and exhanst gas outlet switch J, smoke inlet switch
L, pH buffer dosing switch E linkage start and stop.Smoke inlet switch L is opened, flue gas enters carbon dioxide gas by smoke inlet
Bubble generator B generation carbon dioxide bubbles are discharged in softening pond bottom even, when pH value of solution≤9 in housing A, smoke inlet
Switch L is closed, and exhanst gas outlet switch J is closed, and flue gas recirculation switch N is opened, and it is anti-that reacted flue gas recirculation enters cyclic softening
Ying Chi；During pH ＞ 9, smoke inlet switch K is opened, and flue gas recirculation switch N is closed, and exhanst gas outlet switch J is opened, reacted cigarette
Exhanst gas outlet P of the gas from above cyclic softening reaction tank is directly outer to be arranged；When solution ph≤8 in solution in housing A, pH bufferings
Agent dosing switch open, adds pH buffer to be reacted in cyclic softening reaction tank；As pH value of solution ＞ in solution in housing A
When 8, pH buffer dosing switch is closed, and stops adding pH buffer in cyclic softening reaction tank；The pH buffer is by hydrogen
The one or both of sodium oxide molybdena and ammonium carbonate is by by 1 ~ 10：1 ratio is constituted.
6. the solution after being reacted 1 ~ 2 hour through cyclic softening carries out separation of solid and liquid into microfiltration membranes, and microfiltration membranes concentrated water enters
Sludge concentration tank, microfiltration membranes are specially ceramic membrane.The solid content of the treatment of microfiltration membranes（Can not filter residual miscellaneous）3% ~ 5%, microfiltration membranes
Aperture in 0.2 ~ 1um, one kind of the micro- organic film of microfiltration membranes or inoranic membrane.
In the present embodiment, it is softened reaction 1 ~ 2 hour after solution i.e. the reacted solution of complete cyclic softening.It is complete
The full solution for softening reaction enters micro-filtration, and microfiltration membranes produce water calcium ions and magnesium ions total content in below 100ppm.It is described to react completely, then
The index for reaching is：The bubble average grain diameter that the bubble generator is produced is 200nm-4um, bubble inclusion rate more than 80%, gas
The average rate of climb is steeped in 2-10mm/s.
7. microfiltration membranes are produced water and are concentrated into reverse osmosis membrane, and RO produces Water circulation and supplements water as desulphurization system, and reverse osmosis membrane is
Rolling, flat board, butterfly, one kind of ductwork type.
8. RO concentrated waters are evaporated by bypass flue and realize desulfurization wastewater zero-emission.In the present embodiment, RO concentrated waters enter bypass
Flue evaporative crystallization, crystal salt is flutterred by deduster and caught, and water vapour returns to flue desulfurization system.
Embodiment 2：
With reference to shown in Fig. 3, the scheme of the present embodiment 2 is a kind of device of the carbon dioxide recycle softening waste water in utilization flue gas,
Including regulating reservoir 1, neutralization reaction pond 2, flocculation basin 3, sedimentation basin 4, cyclic softening reaction tank 5, micro-filtration membrane concentration pond 6, microfiltration membranes
Device 7, microfiltration membranes produces water tank 8, reverse osmosis unit 9, reverse osmosis concentrated water tank 10, bypass flue vaporising device 11, reverse osmosis produced water
Collecting box 12, the outlet of wastewater equalization pond 1 is connected with the entrance of neutralization reaction pond 2, the delivery port of neutralization reaction pond 2 and the entrance of flocculation basin 3
It is connected, the delivery port of flocculation basin 3 is connected with sedimentation basin 4, the mud discharging of sedimentation basin 4 mouthful is connected with sludge concentration tank 13, sludge condensation
The spoil disposal outlet of pond 13 and filter press 14 are connected, and the outlet of the clarified solution of sedimentation basin 4 is connected with the entrance of cyclic softening reaction tank 5, circulates soft
Change reaction tank 5 and be also associated with carbon dioxide bubble generator 18, the outlet of cyclic softening reaction tank 5 is connected with micro-filtration membrane concentration pond 6,
Micro-filtration membrane concentration pond 6 is connected with the outlet of the concentrated water of micro-filtration film device 7, and micro-filtration membrane concentration device produces water out and connects microfiltration membranes product water tank 8,
Microfiltration membranes are produced water tank 8 and are connected with reverse osmosis unit 9, and reverse osmosis unit 9 produces water out and connects reverse osmosis produced water collection water tank, counter-infiltration
The outlet of the concentrated water of device 9 connects reverse osmosis concentrated water case 10, and reverse osmosis concentrated water tank 10 is connected with bypass flue vaporising device 11.
In the present embodiment 2, also including pH buffer chemicals dosing plant 17, the pH buffer chemicals dosing plant and cyclic softening are anti-
Pond 5pH buffers dosing mouth is answered to be connected.
In the present embodiment 2, also including PAC chemicals dosing plants 16, the dosing mouth of flocculation basin 3 connection PAC chemicals dosing plants.
In the present embodiment 2, also including calcium hydroxide chemicals dosing plant 15, the dosing mouth of neutralization reaction pond 2 connection calcium hydroxide adds
Medicine device.
In the present embodiment, the structure of cyclic softening reaction tank 5 in the structure and embodiment 1 of the cyclic softening reaction tank 5
It is identical.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to
Nonexcludability is included, so that process, method, article or terminal device including a series of key elements not only include those
Key element, but also other key elements including being not expressly set out, or also include being this process, method, article or end
The intrinsic key element of end equipment.In the absence of more restrictions, limited by sentence " including ... " or " including ... "
Key element, it is not excluded that also there is other key element in the process including the key element, method, article or terminal device.This
Outward, herein, " it is more than ", " being less than ", " exceeding " etc. are interpreted as not including this number；" more than ", " below ", " within " etc. understand
It is to include this number.
Although being described to the various embodiments described above, those skilled in the art once know basic wound
The property made concept, then can make other change and modification to these embodiments, so embodiments of the invention are the foregoing is only,
Not thereby scope of patent protection of the invention, the equivalent structure that every utilization description of the invention and accompanying drawing content are made are limited
Or equivalent flow conversion, or other related technical fields are directly or indirectly used in, similarly it is included in patent of the invention
Within protection domain.
Claims (10)
1. the method that the carbon dioxide recycle in a kind of utilization flue gas softens waste water, it is characterised in that：Comprise the following steps：
The adjusted preliminary sedimentation of power plant desulfurization waste water obtains clarified solution, adds lime to carry out neutralization hair in clarified solution and answers, in regulation solution
PH value to 9.5 ~ 11.5,
Adding PAC in the solution again carries out flocculation reaction, removes tiny suspended particulate substance, then the solution of flocculation reaction is entered into heavy
Shallow lake pond,
The solid particle sludge in solution is precipitated in sedimentation basin,
Clarification and effluent after precipitation is circulated softening reaction into cyclic softening reaction tank,
The complete reacted solution of cyclic softening enters micro-filtrate membrane filtration, carries out separation of solid and liquid, and it is dense that microfiltration membranes concentrated water enters sludge
Contracting pond, microfiltration membranes are produced water and are concentrated into reverse osmosis membrane, produce 60% RO to produce Water circulation, and the RO concentrated waters of generation 40% are by bypassing cigarette
Desulfurization wastewater zero-emission is realized in road evaporation.
2. the method that the carbon dioxide recycle in a kind of utilization flue gas according to claim 1 softens waste water, its feature exists
In：The neutralization reaction time is 1 ~ 2 hour；The flocculation reaction time is that the magnesium ion content for causing in clarified solution for 15 ~ 60 minutes declines
To below 500ppm, sulfate ion content drops to below 5000ppm；Precipitated 2 ~ 4 hours in sedimentation basin, microfiltration membranes produce water
Calcium ions and magnesium ions total content is down to below 100ppm.
3. the method that the carbon dioxide recycle in a kind of utilization flue gas according to claim 1 softens waste water, its feature exists
In：The reaction time of cyclic softening reaction 1 ~ 2 hour, the carbon dioxide bubble for introducing flue gas generation makes waste water and bubble
In carbon dioxide highly mix hybrid reaction, when solution ph≤9 in cyclic softening reaction tank, then by after hybrid reaction
Flue gas recirculation is returned cyclic softening reaction tank and produces carbon dioxide bubble；As solution ph ＞ 9 in cyclic softening reaction tank, then will
Flue gas after hybrid reaction is expelled directly out outside cyclic softening reaction tank, and complete reacted solution enters micro-filtrate membrane filtration.
4. the method that the carbon dioxide recycle in a kind of utilization flue gas according to claim 3 softens waste water, its feature exists
In：The cyclic softening reaction tank includes a hermetically sealed housing and a bubble generator, water inlet is respectively equipped with the housing, is gone out
The mouth of a river, the dosing import of pH buffer, the dosing import of pH buffer are provided with pH buffer dosing switch, and housing inner bottom part sets
The bubble formation for having carbon dioxide bubble generator is exported, and the bubble formation outlet of the bubble generator enters with the bubble of housing
Mouth is connected, and pH detection probes are provided with housing, and pH detection probes go deep into solution in housing, and the housing inner top is provided with gas
Circulating collection mouthful, is connected with flue gas outlet pipe in the gas circulation collection port, flue gas outlet pipe is provided with exhanst gas outlet
Switch, is connected with smoke inlet pipe road on the bubble generator, smoke inlet pipe road is provided with smoke inlet switch, the cigarette
With flue gas outlet pipe by flue gas recirculation pipeline communication, flue gas recirculation pipeline is provided with flue gas recirculation switch to gas admission line,
PH detection probes and exhanst gas outlet switch, smoke inlet switch, pH buffer dosing switch gearing start and stop.
5. the method that the carbon dioxide recycle in a kind of utilization flue gas according to claim 4 softens waste water, its feature exists
In：When pH≤9, smoke inlet switch is closed, and exhanst gas outlet switch is closed, flue gas recirculation switch open, reacted flue gas
It is recycled into cyclic softening reaction tank；During pH ＞ 9, smoke inlet switch open, flue gas recirculation switch is closed, exhanst gas outlet switch
Open, reacted flue gas is arranged from cyclic softening reaction tank is directly outer；
When solution ph≤8 in cyclic softening device, pH buffer dosing switch open is added in cyclic softening reaction tank
PH buffer is reacted；During pH ＞ 8, pH buffer dosing switch is closed, and stops delaying to addition pH in cyclic softening reaction tank
Electuary；
The pH buffer presses 1 ~ 10 by the one or both of NaOH and ammonium carbonate：1 ratio is constituted.
6. the method that the carbon dioxide recycle in a kind of utilization flue gas according to claim 4 softens waste water, its feature exists
In：The bubble average grain diameter that the bubble generator is produced is 200nm-4um, and more than 80%, bubble averagely rises bubble inclusion rate
Speed is in 2-10mm/s.
7. the method that the carbon dioxide recycle in a kind of utilization flue gas according to claim 1 softens waste water, its feature exists
In：In micro-filtrate membrane filtration, the solid content of waste water is processed（Can not filter residual miscellaneous）Be 3% ~ 6%, the aperture of microfiltration membranes in 0.2 ~ 1um,
Microfiltration membranes are one kind of organic film or inoranic membrane,
The reverse osmosis membrane reverse osmosis membrane that uses of concentration is rolling, flat board, butterfly or ductwork type,
The evaporator of the steamed journey of bypass flue uses energy-efficient bypass flue crystallizing evaporator.
8. the method that the carbon dioxide recycle in a kind of utilization flue gas according to claim 7 softens waste water, its feature exists
In：Microfiltration membranes are produced water calcium ions and magnesium ions total content and are down to below 100ppm.
9. the carbon dioxide recycle in a kind of utilization flue gas softens the device of waste water, it is characterised in that：Including wastewater equalization pond
（1）, neutralization reaction pond（2）, flocculation basin（3）, sedimentation basin（4）, cyclic softening reaction tank（5）, micro-filtration membrane concentration pond（6）, micro-filtration
Film device（7）, microfiltration membranes produce water tank（8）, reverse osmosis unit（9）, reverse osmosis concentrated water tank（10）, bypass flue vaporising device（11）
With reverse osmosis produced water collection tank（12）, the wastewater equalization pond（1）Outlet and neutralization reaction pond（2）Entrance is connected, neutralization reaction
Pond（2）Delivery port and flocculation basin（3）Entrance is connected, flocculation basin（3）Delivery port and sedimentation basin（4）It is connected, sedimentation basin（4）Sludge is arranged
Put mouth and sludge concentration tank（13）Connection, sludge concentration tank（13）Spoil disposal is exported and filter press（14）Connection, sedimentation basin（4）Clarification
Liquid is exported and cyclic softening reaction tank（5）Entrance is connected, cyclic softening reaction tank（5）It is also associated with carbon dioxide bubble generator
（18）, cyclic softening reaction tank（5）Outlet and micro-filtration membrane concentration pond（6）It is connected, micro-filtration membrane concentration pond（6）With micro-filtration film device
（7）Concentrated water outlet is connected, micro-filtration film device（7）Produce water out and connect microfiltration membranes product water tank（8）, microfiltration membranes product water tank（8）And reverse osmosis
Saturating device（9）It is connected, reverse osmosis unit（9）Produce water out and connect reverse osmosis produced water collection water tank（12）, reverse osmosis unit（9）Concentrated water
Outlet connects reverse osmosis concentrated water case（10）, reverse osmosis concentrated water tank（10）With bypass flue vaporising device（11）It is connected.
10. the carbon dioxide recycle in a kind of utilization flue gas according to claim 9 softens the device of waste water, and its feature exists
In：
Also include pH buffer chemicals dosing plant（17）, the pH buffer chemicals dosing plant（17）With cyclic softening reaction tank（5）pH
Buffer dosing mouth is connected；
Also include PAC chemicals dosing plants（16）, flocculation basin（3）Dosing mouth connects PAC chemicals dosing plants（16）；
Also include calcium hydroxide chemicals dosing plant（15）, neutralization reaction pond（2）Dosing mouth connects calcium hydroxide chemicals dosing plant（15）.
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