CN104689676B - wet desulphurization waste water utilization system and technique thereof - Google Patents
wet desulphurization waste water utilization system and technique thereof Download PDFInfo
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Abstract
The present invention relates to wet desulphurization waste water utilization system and technique thereof, system includes being sequentially connected flue, cleaner unit, absorption tower and the discharge of wastewater pipeline connect, and is provided with biphase gas and liquid flow nebulizer in flue；After the atomization waste water that the former flue gas entered by flue and biphase gas and liquid flow nebulizer are sprayed interacts, removing dust device dedusting, enter absorption tower and carry out desulfurization process, gained waste water is transported to biphase gas and liquid flow nebulizer through discharge of wastewater pipeline, biphase gas and liquid flow nebulizer sprays after being atomized by waste water, atomization waste water again with former Interaction Between Smoke, and so forth, make waste water be obtained by.The present invention solves secondary pollution problem and the water resource loss problem of discharge of wastewater, realize waste water in intrasystem efficient recycling, make wet desulfurization system entirely without discharge of wastewater, using water wisely, simultaneously, the dust removing effects of cleaner unit is greatly improved, thus promotes the raising of wet desulfurization system entirety economical environment-protective effect, be suitable to popularization and application in the related art.
Description
Technical field
The present invention relates to fume treatment produce waste water reclamation utilize technical field, particularly relate to wet desulphurization waste water utilization system and
Its technique, in processing smoke-gas wet desulfurization, produced waste water comprehensively utilizes.
Background technology
At present, boiler flue gas desulfurization is processed as main in a wet process, and wet desulfurizing process principle is mainly high temperature unsaturation flue gas and desulfurization
Serosity occurs gas-liquid mass transfer to react in absorption tower, and flue gas cool-down humidification forms saturated flue gas, the sour gas in flue gas and serosity
In reducing agent reaction generate salt.Due in boiler smoke with a certain amount of chlorine root, at the gas-liquid mass transfer that wet desulphurization processes
During, the chlorine root in flue gas can be washed down and accumulate in desulfurization slurry；Meanwhile, during processing at this, add to
Also with a small amount of chlorion in the fresh water (FW) of desulphurization system；Above-mentioned both chlorions are chlorions in desulfurization slurry
Source.Along with flue gas desulfurization process carrying out, the continuous cumulative rises of chlorion in desulfurization slurry, and the chlorine root of high concentration from
Material can be caused the biggest corrosivity by son, and meanwhile, chlorion content higher in serosity can reduce system desulfuration efficiency.Cause
This, wet desulfurization system needs at finite concentration (general requirement is below 20000ppm) to ensure that system chlorion is stable
Get rid of a certain amount of waste water, make chlorion discharge desulphurization system along with waste water, thus ensure that in desulfurization slurry, chlorion is dense
Degree.The waste water that desulphurization system is discharged typically is entering domestic sewerage systems through series abatement processes heel row, but, inevitably
Even if desulfurization wastewater is the most still containing more salinity and heavy metal etc., environment is still had bigger pollution.Furthermore,
Because desulfurization wastewater is essentially from wet desulfurization system waste water treatment section such as limestone, containing a small amount of solid and a large amount of chlorine inside waste water
The material such as ion, sulfate, conventional Waste Water Treatment be by add inside desulfurization wastewater coagulant, flocculation aid, alkali,
The materials such as acid discharge after removing the harmful substance in waste water again, and on the one hand this process technique need to add substantial amounts of chemical agent,
Economical operation cost is high.Additionally, direct discharging of waste water wastes water resource, with the 300MW unit commonly used at present it is
Example, every 300MW unit efflux wastewater amount about 5t/h, water consumption is huge, and energy loss is serious.
In prior art, patent of invention ZL201110076844.0 discloses a kind of zero emission treatment of desulfured waste water, including with
Lower step: 1) desulfurization wastewater after desulfurizing tower desulfurization is entered preliminary sedimentation tank, through initial gross separation in preliminary sedimentation tank, will isolate
Upper clear supernate be transported in Buffer Pool through serosity pump；2) desulfurization wastewater in Buffer Pool is passed sequentially through atomising device and electrostatic removes
Dirt device；3) through sludge pump, waste water bigger for preliminary sedimentation tank bottom solid content being transported to sludge buffer pool, containing in sludge buffer pool is solid
Measure bigger waste water and be transported to pressure filter through another sludge pump；4) waste water after filtering is in serosity pumped back preliminary sedimentation tank；5)
Filter mud outward transport after filtering.This invention achieves certain technique effect in terms of using water wisely, but, in terms of environmental protection also
There is filter mud outward transport and process hidden danger, and the Financial cost of equipment puts into height.
Therefore, for ensureing effective operation of wet desulfurization system device, it is to avoid equipment corrosion, meanwhile, it is effectively improved environment protecting,
And saving water resource, need badly and develop the technology efficiently processing the waste water that smoke-gas wet desulfurization produces.
Summary of the invention
It is an object of the invention to, the problem existed for existing wastewater desulfurized by fume wet treatment technology, it is provided that wet desulphurization waste water
Utilize system and technique thereof, make full use of the system for cleaning fume equipment such as existing wet desulphurization denitration, carry out omnidistance analysis
And optimize and combine design, it is achieved waste water is in intrasystem efficient recycling, and low cost strengthens environment protecting, reduce water resource other
The loss of equipment and materials, saves and arranges the space that other processing equipments take, it is to avoid equipment corrosion, meanwhile, fully improve environmental protection
Effect.
The present invention solves the technical scheme of problem: wet desulphurization waste water utilization system, including be sequentially connected connect flue, remove
Dirt device, absorption tower and discharge of wastewater pipeline, wherein, be provided with biphase gas and liquid flow nebulizer in described flue.
Further, in wet desulphurization waste water utilization system of the present invention, described biphase gas and liquid flow nebulizer be arranged on described in enter cigarette
At the smoke inlet that road is connected with cleaner unit.
Further, in wet desulphurization waste water utilization system of the present invention, described biphase gas and liquid flow nebulizer has many groups, described many
Group biphase gas and liquid flow nebulizer is arranged in the cross section of flue with network structure.
Preferably, in wet desulphurization waste water utilization system of the present invention, described biphase gas and liquid flow nebulizer include nozzle, air chamber,
Suction nozzle, mixing tube, anemostat, wherein, described nozzle is connected with described air chamber, described air chamber respectively with described suction nozzle
Being connected with mixing tube, described suction nozzle is connected with outside air, and one end of described mixing tube is adjacent with described nozzle, institute
The other end stating mixing tube is connected with described anemostat.
It is preferred that in wet desulphurization waste water utilization system of the present invention, described nozzle is located in described air chamber, wherein, described
The entrance of nozzle is connected with described discharge of wastewater pipeline, and the outlet of described nozzle is adjacent with described mixing tube.
Present invention also offers a kind of water reuse technique applying above-mentioned wet desulphurization waste water utilization system to carry out, by entering cigarette
After the atomization waste water that the former flue gas that road enters and biphase gas and liquid flow nebulizer spray interacts, removing dust device dedusting, after dedusting
Flue gas enters absorption tower and carries out desulfurization process, and after desulfurization processes, gained waste water is transported to biphase gas and liquid flow atomization through discharge of wastewater pipeline
Device, biphase gas and liquid flow nebulizer by waste water be atomized after spray, atomization waste water again with former Interaction Between Smoke, and so forth, make to give up
Water is obtained by.
Further, in wet desulphurization water reuse technique of the present invention, the atomization carried out by described biphase gas and liquid flow nebulizer
Waste water injection direction is identical with former flue gas flow direction.
Further, in wet desulphurization water reuse technique of the present invention, the atomization waste water of described biphase gas and liquid flow nebulizer injection
Mist droplet particle size be less than 600 microns.
Further, in wet desulphurization water reuse technique of the present invention, described biphase gas and liquid flow nebulizer is in compressed air effect
Lower waste water is atomized after the spraying in former flue gas of uniformly continuous.
Further, in wet desulphurization water reuse technique of the present invention, described biphase gas and liquid flow nebulizer include nozzle, air chamber,
Suction nozzle, mixing tube, anemostat, wherein, described nozzle is located in described air chamber, described air chamber respectively with described suction nozzle
Being connected with mixing tube, described suction nozzle is connected with outside air, and the entrance of described nozzle is connected with described discharge of wastewater pipeline
Connecing, the outlet of described nozzle is adjacent with one end of described mixing tube, and the other end of described mixing tube is connected with described anemostat；
The air sucked from the external world is constantly transported in described air chamber by described suction nozzle, in described air chamber, is compressed air,
Gained compressed air enters in described mixing tube；Waste water is transported in described nozzle by described discharge of wastewater pipeline, and described nozzle will
Waste water is sprayed onto in described mixing tube；In described mixing tube, the waste water of described nozzle injection meets with compressed air, at compression sky
Under the effect of gas, waste water atomization also sprays from described anemostat, then with former Interaction Between Smoke.
Wet desulphurization waste water utilization system of the present invention makes full use of the system for cleaning fume equipment such as existing wet desulphurization denitration,
On the basis of existing smoke-gas wet desulfurization processing means, add-assembly can obtain, it is not necessary to additionally takes up room, to original desulfurization system
System equipment does not results in any impact, and wherein, the wet desulfurization system for transformation can be limestone calcium method desulphurization system, ammonia
Method desulphurization system, double alkali method desulfurizing system etc., additionally, what wet desulphurization waste water utilization system of the present invention can also be correlated with at other
Add-assembly acquisition is carried out, such as wet denitration system, wet method demercuration system and wet on the basis of existing wet flue gas processing means
The wet flue gas processing means etc. that method desulfurization denitration demercuration combines.Wet desulphurization waste water utilization system of the present invention is applied to carry out waste water
Utilizing, the water in waste water will be evaporated in flue gas reduce flue-gas temperature and be humidified, and salinity and solid matter in waste water will be along with cigarettes
Dust in gas discharges cleaner unit after being collected by cleaner unit；And, sprayed into the desulfurization wastewater of quantity at this, flue gas with after warp
Just by the moisture of few evaporation quantity when crossing the absorption tower of wet desulphurization, thus reach purpose of economizing on water, be also truly realized wet desulphurization
System is without arranging outside waste water；Additionally, flue gas reduces owing to spraying into temperature after waste water, the volume of flue gas will reduce, and flow through cleaner unit
Flue gas flow rate reduce, thus be beneficial to improve cleaner unit dust removing effects；Meanwhile, the humidity of flue gas increases, the ratio of dust
Resistance reduces, and the most also makes the efficiency of dust collection of cleaner unit be improved；And the flue gas after decreasing temperature and increasing humidity is also beneficial to reduce equipment
Corrosion.
Compared with prior art, the invention has the beneficial effects as follows: efficiently solve secondary pollution problem and the water of discharge of wastewater
Resource loss problem, it is achieved waste water, in intrasystem efficient recycling, makes wet desulfurization system entirely without discharge of wastewater, economizes on
Water, meanwhile, is greatly improved the dust removing effects of cleaner unit, thus is also beneficial to subsequent wet desulphurization system entirety fume treatment effect
Raising；Additionally, system is arranged does not has any impact to existing equipment device, and add without carrying out extra sewage treatment equipment
If the most significantly having saved the loss of equipment and materials, also save the space that wet desulfurization system entirety takies；Generally,
Present invention achieves environment protecting enhancing and reduce the parallel of unification mutually, and process operation simple optimizing with using water wisely and Financial cost,
Reliability is high, is suitable in fire coal, fuel oil, combustion gas, thermal power plant, metallurgy, chemical industry, solid waste (rubbish) process etc.
Popularization and application in the association area of high-temperature flue gas process need to be carried out.
Accompanying drawing explanation
Fig. 1 is the structural representation of wet desulphurization waste water utilization system of the present invention；
Fig. 2 is the biphase gas and liquid flow atomizer structure schematic diagram in embodiment 2 in wet desulphurization waste water utilization system of the present invention.
Shown in figure: 1-flue；2-cleaner unit；3-absorption tower；4-discharge of wastewater pipeline；5-biphase gas and liquid flow nebulizer, 501-
Nozzle, 502-air chamber, 503-suction nozzle, 504-mixing tube, 505-anemostat.
Detailed description of the invention
The present invention will be described with embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As it is shown in figure 1, a kind of wet desulphurization waste water utilization system of the present invention, including being sequentially connected flue 1, the dedusting connect
Device 2, absorption tower 3 and discharge of wastewater pipeline 4, wherein, be provided with biphase gas and liquid flow nebulizer 5 in described flue 1.
In the above-described embodiments, for strengthening water reuse effect, described biphase gas and liquid flow nebulizer be preferably provided at flue 1 with
At the smoke inlet that cleaner unit 2 is connected；Preferably, described biphase gas and liquid flow nebulizer 5 has many groups, organizes biphase gas and liquid flow more
Nebulizer 5 is arranged in the cross section of flue with network structure, so that former flue gas is fully contacted with atomization waste water, fully improves useless
The utilization rate of water, and can effectively prevent the atomization waste water ejiction opening of biphase gas and liquid flow nebulizer 5 from blocking, ensure biphase gas and liquid flow
The stable and high effective operation of nebulizer 5.
In the above-described embodiments, described flue 1, cleaner unit 2, absorption tower 3 and discharge of wastewater pipeline 4 are existing wet method
The system for cleaning fume equipment institutes such as desulphurization denitration are indispensable, fully optimize and make full use of existing equipment, with setting of simplifying after analyzing
Meter add-assembly on the basis of existing smoke-gas wet desulfurization processing means obtains wet desulphurization waste water utilization system of the present invention, it is not necessary to volume
Taking up room outward, original desulphurization system equipment does not results in any impact, wherein, the wet desulfurization system for transformation can
For limestone calcium method desulphurization system, ammonia method desulfurizing system, double alkali method desulfurizing system etc., it is also possible to for the existing wet method that other are relevant
Flue gas processing device, the wet flue gas combined such as wet denitration system, wet method demercuration system and wet desulphurization denitration demercuration
Processing means etc..
When applying wet desulphurization waste water utilization system of the present invention to carry out water reuse, it is currently used for carrying out the wet desulphurization of fume treatment
System is properly functioning, concrete unlike: the mist of the former flue gas entered by flue 1 and biphase gas and liquid flow nebulizer 5 injection
After changing waste water interaction, removing dust device 2 dedusting, the flue gas after dedusting enters absorption tower 3 and carries out desulfurization process, and desulfurization processes
Rear gained waste water is transported to biphase gas and liquid flow nebulizer 5 through discharge of wastewater pipeline 4, and waste water is atomized by biphase gas and liquid flow nebulizer 5
Rear ejection, atomization waste water again with former Interaction Between Smoke, and so forth, make waste water be obtained by.
In above-mentioned water reuse embodiment, can be straight for self-absorption tower 3 for being transported to the waste water of biphase gas and liquid flow nebulizer 5
Run in the desulfurization wastewater put, it is also possible to for the waste water recycled through different modes.
In above-mentioned water reuse embodiment, for making former flue gas be fully contacted effect with atomization waste water, it is preferable that make described gas
The direction of liquid two-phase nebulizer 5 jet atomization waste water is identical with former flue gas flow direction；Preferably, described biphase gas and liquid flow nebulizer
The mist droplet particle size of the atomization waste water of 5 injections is less than 600 microns, so that former flue gas is fully fused with atomization waste water and improves waste water
Utilization rate；Moreover it is preferred that described biphase gas and liquid flow nebulizer 5 under compressed air effect by waste water be atomized after uniformly continuous
Spray in former flue gas, thus strengthen water reuse speed and with the intensity of former smoke contacts.
During applying wet desulphurization waste water utilization system of the present invention to carry out water reuse, in flue 1, the water in waste water is met
High-temperature flue gas will be heated and be evaporated in flue gas reduce flue-gas temperature and make flue gas be humidified；Flue gas after humidifying cooling enters cleaner unit 2
In carry out dedusting, salinity in waste water and solid matter discharge cleaner unit 2 after being collected by cleaner unit 2 along with the dust in flue gas；
And, in the process, spray into the desulfurization wastewater of quantity, when flue gas then passes through absorption tower 3, just will evaporate quantity less
Desulfurizing agent spray liquid (carrying out flue gas desulfurization with desulfurizing agent spray liquid in existing wet desulphurization absorption tower) in moisture, thus
Realize the overall water consumption of saving system, and then also achieve wet desulfurization system without row and waste water outside waste water at intrasystem comprehensive utilization
With；Furthermore, flue gas reduces owing to spraying into temperature after waste water, and the volume of flue gas will reduce, and flow through the flue gas flow rate of cleaner unit 2
Reduce, make flue gas time of staying in cleaner unit 2 increase, thus be beneficial to improve the dust removing effects of cleaner unit 2；Meanwhile,
The humidity of flue gas increases, and the ratio resistance of dust reduces, and the most also makes the efficiency of dust collection of cleaner unit 2 be improved；And decreasing temperature and increasing humidity
After flue gas be also beneficial to reduce corrosion to equipment.Furthermore, it is necessary to explanation, in processing systems such as existing smoke-gas wet desulfurizations
In, former flue gas is essentially high-temperature flue gas, and the wastewater flow rate of wet desulfurization system is relatively fewer, and atomization waste water is in high-temperature flue gas effect
Under can be faster by vaporizing and drying, therefore, the relevant devices such as flue 1 and cleaner unit 2 will not be caused corrosion；And waste water
Solid content is low, and the ratio that the total solid after waste water evaporation drying accounts for the ash in flue gas is the lowest, ash composition will not be caused shadow
Ringing, salinity and solid particulate matter in waste water will be discharged with the ash in flue gas.Generally, by above-mentioned application, it is possible to
Efficiently solve secondary pollution problem and the water resource loss problem of discharge of wastewater, it is achieved waste water is in intrasystem profit the most again
With, make wet desulfurization system entirely without discharge of wastewater, it is achieved that environment protecting strengthens to reduce with using water wisely and Financial cost unites mutually
The parallel multiple effect of one, and run simple optimizing, reliable and stable.
Embodiment 2
As depicted in figs. 1 and 2, a kind of wet desulphurization waste water utilization system of the present invention, its basic setup and apply same embodiment
1, for strengthening except wastewater utilization effect, and then the smoke desulfurization efficiency in raising downstream, also include arranging as follows:
Described biphase gas and liquid flow nebulizer 5 includes nozzle 501, air chamber 502, suction nozzle 503, mixing tube 504, anemostat 505,
Wherein, nozzle 501 is connected with air chamber 502, and air chamber 502 is connected with suction nozzle 503 and mixing tube 504 respectively, air-breathing
Pipe 503 is connected with outside air, and one end of mixing tube 504 is adjacent with nozzle 501, the other end of mixing tube 504 and expansion
Dissipate pipe 505 to be connected.
In above-described embodiment, for strengthening waste water atomizing effect, waste water is made to be atomized into low granularity droplet grain, it is preferable that described nozzle
501 are located in air chamber 502, and wherein, the entrance of nozzle 501 is connected with discharge of wastewater pipeline 4, the outlet of nozzle 501
Adjacent with mixing tube 504, thus beneficially waste water be atomized under compressed air effect and uniformly continuous spray, and then strengthen useless
Water use efficiency.
When applying above-mentioned wet desulphurization waste water utilization system to carry out water reuse, the basic method of operation is with embodiment 1, real obtaining
On the basis of executing the technique effect of example 1, the utilization ratio of waste water is improved, especially the interaction of waste water and former flue gas
Intensity is improved；Specifically, during being atomized waste water in biphase gas and liquid flow nebulizer 5, suction nozzle 503 is not
Break and the air sucked from the external world is transported in air chamber 502, in air chamber 502, air is compressed, gained compressed air
Enter in mixing tube 504；Waste water is transported in nozzle 501 by discharge of wastewater pipeline 4, and waste water is sprayed onto mixing tube by nozzle 501
In 504；In mixing tube 504, the waste water of nozzle 501 injection meets with compressed air, under compressed-air actuated effect, useless
Water atomization self-diffusion pipe 505 spray, then with former Interaction Between Smoke.
The invention is not restricted to above-mentioned embodiment, it is any obviously to above-mentioned embodiment that those skilled in the art are made
Improve or change, all without beyond the design of the present invention and the protection domain of claims.
Claims (3)
1. wet desulphurization waste water utilization system, including being sequentially connected flue, cleaner unit, absorption tower and the discharge of wastewater pipeline connect,
It is characterized in that, in described flue, be provided with biphase gas and liquid flow nebulizer；Described biphase gas and liquid flow nebulizer enters described in being arranged on
At the smoke inlet that flue is connected with cleaner unit；Described biphase gas and liquid flow nebulizer has many groups, described many group biphase gas and liquid flow mists
Change device to be arranged in the cross section of flue with network structure；Described biphase gas and liquid flow nebulizer include nozzle, air chamber, suction nozzle,
Mixing tube, anemostat, wherein, described nozzle is connected with described air chamber, described air chamber respectively with described suction nozzle and mixing tube
Being connected, described suction nozzle is connected with outside air, and one end of described mixing tube is adjacent with described nozzle, described mixing tube
The other end be connected with described anemostat；Described nozzle is located in described air chamber, and wherein, the entrance of described nozzle is with described
Discharge of wastewater pipeline is connected, and the outlet of described nozzle is adjacent with described mixing tube.
2. the water reuse technique that the wet desulphurization waste water utilization system that a kind is applied described in claim 1 is carried out, it is characterised in that
Waste water is atomized as uniformly continuous after the droplet of particle diameter less than 600 microns under compressed air effect by described biphase gas and liquid flow nebulizer
Spray in the former flue gas entered by flue, the direction of the jet atomization waste water of described biphase gas and liquid flow nebulizer and former flue gas
Flowing to identical, after the atomization waste water that former flue gas and biphase gas and liquid flow nebulizer spray interacts, removing dust device dedusting, after dedusting
Flue gas enter absorption tower and carry out desulfurization process, after desulfurization processes, gained waste water is transported to biphase gas and liquid flow mist through discharge of wastewater pipeline
Change device, biphase gas and liquid flow nebulizer by waste water be atomized after spray, atomization waste water again with former Interaction Between Smoke, and so forth, make
Waste water is obtained by.
Water reuse technique the most according to claim 2, it is characterised in that: described biphase gas and liquid flow nebulizer include nozzle,
Air chamber, suction nozzle, mixing tube, anemostat, wherein, described nozzle is located in described air chamber, and described air chamber is respectively with described
Suction nozzle is connected with mixing tube, and described suction nozzle is connected with outside air, the entrance of described nozzle and described wastewater discharge pipe
Road is connected, and the outlet of described nozzle is adjacent with one end of described mixing tube, the other end of described mixing tube and described anemostat
It is connected；
The air sucked from the external world is constantly transported in described air chamber by described suction nozzle, in described air chamber, presses air
Contracting, gained compressed air enters in described mixing tube；Waste water is transported in described nozzle by described discharge of wastewater pipeline, described spray
Waste water is sprayed onto in described mixing tube by mouth；In described mixing tube, the waste water of described nozzle injection meets with compressed air, in pressure
Under the effect of contracting air, waste water atomization also sprays from described anemostat, then with former Interaction Between Smoke.
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| JP6723793B2 (en) * | 2016-03-31 | 2020-07-15 | 三菱日立パワーシステムズ株式会社 | Desulfurization treatment apparatus and method of operating desulfurization treatment apparatus |
| CN106076100A (en) * | 2016-08-08 | 2016-11-09 | 浙江大学 | A kind of coal-fired flue-gas semidry method takes off the desulfurization wastewater Zero discharging system of fluorine and chlorine removal |
| CN108096988B (en) * | 2018-02-09 | 2020-03-17 | 中冶长天国际工程有限责任公司 | Flue gas purification method and system for realizing zero discharge of wastewater |
| CN111318158B (en) * | 2020-02-24 | 2022-04-08 | 中国神华能源股份有限公司国华电力分公司 | Flue gas desulfurization and dust removal system and method |
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