CN206512015U - One kind utilizes SO in desulfurization wastewater removing boiler smoke3System - Google Patents
One kind utilizes SO in desulfurization wastewater removing boiler smoke3System Download PDFInfo
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- CN206512015U CN206512015U CN201621333128.0U CN201621333128U CN206512015U CN 206512015 U CN206512015 U CN 206512015U CN 201621333128 U CN201621333128 U CN 201621333128U CN 206512015 U CN206512015 U CN 206512015U
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- desulfurization wastewater
- boiler smoke
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Abstract
The utility model is related to boiler flue gas purification technical field, and in particular to one kind utilizes SO in desulfurization wastewater removing boiler smoke3Method and removing system.The desulfurization wastewater that desulfurizing tower is produced is centrifuged, pH regulations, prepares sulfur trioxide removing liquid of the pH value between 9~10, and sulfur trioxide removing liquid is sprayed in the flue of boiler, to remove the SO in boiler smoke3.By the after-treatment to desulfurization wastewater, metal ion therein and other impurities are reduced, desulfurization wastewater removing SO is improved3Efficiency, maximum removal efficiency is up to 99%.Desulfurization wastewater is sprayed into by the diverse location in flue, SO is done step-by-step3Removing, not only solve sulfur removal technology in diverse location because of SO3The problem of excessive concentration is brought, is also prevented from same position and sprays into excessive desulfurization wastewater, cause the problem of atomized drop can not evaporate；Zero-emission and the Combined Treatment removing SO of desulfurization wastewater are also achieved simultaneously3。
Description
Technical field
The utility model is related to boiler flue gas purification technical field, and in particular to one kind removes boiler smoke using desulfurization wastewater
SO in gas3System.
Background technology
Rich coal resources in China, and coal fired power generation is reliable, technology maturation, and China is with coal fired power generation for a long time
It is used as the main source of energy resource supply.However, various environmental pollutions can be produced in the operation of coal-burning power plant, predominantly coal-fired cigarette
The atmosphere pollution that gas discharge is brought.Therefore, coal-burning power plant is generally using denitration, desulfurization and dust collecting process to the NO in flue gasX、
SO2And dust is controlled.
In traditional flue gas purifying technique, domestic coal-burning power plant generally carries out denitrating flue gas, but SCR using SCR techniques
Catalyst can be by the part SO in flue gas2Catalysis oxidation is SO3, further increase SO in flue gas3Concentration, so as to cause empty pre-
Device is blocked and the corrosion to back-end ductwork.The control of the Conventional pollutions such as the electrostatic precipitator and WFGD of traditional coal fired power plant is set
For to SO in flue gas3Removal efficiency is relatively low.And most widely used flue gas desulfurization technique --- Limestone-gypsum Wet Flue Gas Desulfurization Process skill
Art, periodically discharges a large amount of waste water (i.e. desulfurization wastewater), the waste water suspension, salt and tenor are high and corrode in the process of running
Property it is strong, need to by processing could qualified discharge, and simple waste water treatment process undoubtedly adds the operating cost of thermal power plant.
At present, for Desulphurization for Coal-fired Power Plant waste water and SO3Deng the control of pollutant, often only Single Pollution thing is carried out
Processing.However, coal-burning power plant's pollutant catabolic gene process-intensive, equipment are numerous and jumbled, how to carry out many pollution joint removings is coal-fired electricity
The research emphasis of factory's pollutant control.
Therefore, Chinese patent literature CN203030173U, which discloses chlorine element in a kind of coal, recycles realization pollution Internet of Things
The device of removing is closed, it adds highly basic and returned in desulfurization wastewater and is sprayed onto in boiler smoke, to remove the mercury and SO in flue gas3,
But the alkaline desulfurization wastewater that the device is produced is for solidliquid mixture or containing partial flocculation thing, and its atomizing effect is poor, easily blocks mist
Change nozzle, so as to cause SO3Removal efficiency is relatively low；Furthermore, substantial amounts of metal ion is contained in desulfurization wastewater, does not process and is taken off
Nitre, can cause SCR catalyst to be poisoned, and influence the effect of denitrating flue gas, and metal ion is easily caused with highly basic formation precipitation
Atomizer is blocked, and causes spraying uneven.
In addition, Chinese patent literature CN105126561A also discloses a kind of coal-fired cigarette based on desulfurization wastewater evaporation process
Gas PM2.5/SO3/ Hg combines removal methods.Specifically, adding what is be made up of high polymer cemented dose and wetting agent in desulfurization wastewater
Chemical agglomeration agent, sprays into flue, to realize PM2.5/SO3/ Hg joint removing, but this method in desulfurization wastewater by adding
Plus the chemical agglomeration agent being made up of high polymer cemented dose and wetting agent, not only increase removing PM2.5/SO3/ Hg cost, it is heavier
Want, chemical agglomeration agent is to SO3There is no specific absorption, removal efficiency is low.
Utility model content
Technical problem to be solved in the utility model is that existing desulfurization wastewater metal ion content is high, SO3Removal efficiency
Low, SCR catalyst activity weakens, the problem of denitration effect is poor.
In order to solve the above technical problems, the technical solution adopted in the utility model is as follows：
The utility model provides SO in a kind of removing boiler smoke using desulfurization wastewater3System, including with desulfurizing tower phase
The desulfurization wastewater treatment system of connection, and sulfur trioxide removing liquid spraying system, wherein,
The desulfurization wastewater treatment system, including the first cyclone, pH adjusting meanss, the second cyclone being sequentially connected with,
Sulfur trioxide removing liquid is obtained to handle desulfurization wastewater successively progress；
The sulfur trioxide removes liquid spraying system, including removing liquid transfer pipeline and the spray being arranged in boiler flue
Head, the entrance point of the removing liquid transfer pipeline is connected with second cyclone, the outlet of the removing liquid transfer pipeline
End is connected with the shower nozzle, the sulfur trioxide obtained after the processing of the second cyclone removing liquid is sprayed into boiler smoke
In road.
Optionally, the desulfurizing tower is connected with the afterbody of boiler flue, to receive boiler smoke and it is taken off
Sulphuring treatment；
Along the flow direction of boiler smoke, economizer, SCR reactors, sky are disposed with the boiler flue pre-
Device and electric dust collector.
Optionally, it is provided with the first shower nozzle between the economizer and the SCR reactors.
Optionally, it is provided with the second shower nozzle between the SCR reactors and the air preheater.
Optionally, the 3rd shower nozzle is provided between the air preheater and the electric dust collector.
Optionally, the 4th shower nozzle is provided between the electric dust collector and the desulfurizing tower.
Optionally, the first cyclone bottom is also associated with vacuum belt filter.
Optionally, the pH adjusting meanss are provided with chemicals dosing plant, to add processing of the chemicals realization to waste water.
Optionally, the pH adjusting meanss are provided with agitating device, to stir waste water and the chemicals added
Mix, realization is sufficiently mixed to waste water and chemicals.
Optionally, the desulfurizing tower is additionally provided with fume extractor, to discharge the boiler smoke after being handled through the desulfurizing tower
Gas.
Above-mentioned technical proposal of the present utility model has advantages below：
1st, the utility model embodiment provides SO in a kind of removing boiler smoke using desulfurization wastewater3Method, including：
(1) desulfurization wastewater is centrifuged obtaining desulfurated plaster and separating liquid；(2) pH for the separating liquid that regulating step (1) is obtained
Part metals ion formation in separating liquid is precipitated between 9~10, obtains demetalization ion waste water by value；(3) will be described
Demetalization ion waste water is centrifuged, and removes precipitation by metallic ion therein, prepares sulfur trioxide removing liquid；(4)
Sulfur trioxide removing liquid is sprayed in the flue of the boiler, to remove the SO in boiler smoke3.By to desulfurizing tower
The desulfurization wastewater of generation carries out metal ion and other impurities in after-treatment, desulfurization wastewater of the reduction from desulfurizing tower, carries
High desulfurization wastewater removes SO3Efficiency, maximum removal efficiency is up to 99%.
In addition, by the desulfurization wastewater of diverse location penetrating after treatment on flue, SO is done step-by-step3Removing,
Not only solve sulfur removal technology in diverse location because of SO3The problem of excessive concentration is brought, is also prevented from same position and sprays into excessively
Desulfurization wastewater, causes the problem of atomized drop can not evaporate；Zero-emission and the Combined Treatment of desulfurization wastewater are also achieved simultaneously
Remove SO3。
2nd, the utility model embodiment provides SO in a kind of removing boiler smoke using desulfurization wastewater3System, atomization spray
Mouth is arranged between SCR reactors and economizer, because desulfurization wastewater contains higher chlorion, is sprayed into before SCR reactors, cigarette
Temperature degree is higher, can preferably promote mercury element to be converted into mercury oxide, promotes absorption of the mercury oxide in desulfurizing tower.In addition,
There is minimum continuous spray ammonia temperature in SCR catalyst, and relevant with ammonium hydrogen sulfate generation in operation.When boiler load is low, cause
Exhaust gas temperature less than SCR it is minimum it is continuous spray ammonia temperature when, SCR device is out of service.Treated take off is sprayed into before SCR device
Sulphur waste water, can effectively reduce SO before SCR reactors3Concentration, improve it is minimum it is continuous spray ammonia temperature.
3. the utility model embodiment provides SO in a kind of removing boiler smoke using desulfurization wastewater3System, SCR device
Desulfurization wastewater after preceding penetrating processing effectively reduces SO in flue gas3Concentration, but flue gas pass through SCR reactors when, SCR catalyst
Can be by part SO in flue gas2It is oxidized to SO3, further lift the SO in flue gas3Concentration.SCR reactors are arranged in atomizer
Desulfurization wastewater between air preheater after position penetrating processing can prevent SO3The NH escaped with SCR device3Generate excess sulfuric acid
Hydrogen ammonium is blocked, corrosion air preheater, while being also prevented from SO3Corrosion air preheater itself.
4. the utility model embodiment provides SO in a kind of removing boiler smoke using desulfurization wastewater3System, removed in electricity
Dirt device and air preheater and atomizer is respectively arranged between desulfurizing tower, desulfurization of this position further after penetrating processing is given up
Water, is conducive to further reducing SO3Concentration, prevent it from corroding electrostatic precipitator and chimney.
Brief description of the drawings
In order that content of the present utility model is more likely to be clearly understood, below according to specific implementation of the present utility model
Example and with reference to accompanying drawing, the utility model is described in further detail, wherein：
Fig. 1 is the described removing SO described in the utility model embodiment 13System process figure；
Reference is expressed as in figure：1- boilers, 2- economizers, 3-SCR reactors, 4- air preheaters, 5- electric dust collectors,
6- desulfurizing towers, 7- chimneys, 8- flues, the shower nozzles of 9- first, the shower nozzles of 10- second, the shower nozzles of 11- the 3rd, the shower nozzles of 12- the 4th, 13- first
Cyclone, 14- vacuum belts filter, 15- chemicals dosing plants, 16- clear water reserviors, 17- agitators, the cyclones of 18- second.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is a part of embodiment of the utility model, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.As long as in addition, technical characteristic involved in the utility model different embodiments disclosed below
Not constituting conflict each other can just be combined with each other.
Embodiment 1
The present embodiment provides SO in a kind of removing boiler smoke using desulfurization wastewater3System, as shown in figure 1, including：Pot
Stove 1, along the flow direction of boiler smoke, economizer 2, SCR reactors 3, air preheater 4, electricity is set gradually on boiler flue 8 and is removed
Dirt device 5, desulfurizing tower 6 and chimney 7；Wherein, boiler smoke is received in desulfurizing tower 6, and carries out desulfurization process to it.
Sulfur dioxide and a small amount of sulfur trioxide in desulfurizing tower removing flue gas, the desulfurization wastewater of generation pass through desulfurization tower bottom
It is the first cyclone 13 to connect in the separator set, the present embodiment, and centrifugation point is carried out to the desulfurization wastewater that desulfurizing tower is produced
From obtaining desulfurated plaster and separating liquid.
The pH adjusting meanss that the separating liquid being centrifuged enters in desulfurization wastewater treatment system, wherein, pH adjusting meanss
Including clear water reserviors 16, for storing the separating liquid centrifuged；Chemicals dosing plant 15, for adding alkaline matter；And agitating device
17, for fully mixing separating liquid and alkaline matter in pH adjusting meanss.Pass through chemicals dosing plant 15, addition quick lime, niter
One or more in ash, caustic soda and sodium carbonate, to adjust the pH value of separating liquid between 9~10, and are precipitated in separating liquid
Most metal ion, such as magnesium ion, iron ion, aluminium ion etc. is its hydroxide precipitation, prepares demetalization ion
Waste water.As one embodiment of the present utility model, in the present embodiment, the alkaline matter of addition is calcium hydroxide, adjusts separating liquid
PH be 9.0, obtain demetalization ion waste water.
The desulfurated plaster centrifuged through the first cyclone 13 enters vacuum belt filter 14, to desulfurated plaster and desulfurization
Waste water carries out filtering emission.
The demetalization ion waste water obtained after pH regulations processing enters the second cyclone 18, de- to remove by centrifuging
The hydroxide precipitation formed in metal ion waste water, is made sulfur trioxide removing liquid.
The solidliquid mixture that second cyclone 18 is produced carries out separation of solid and liquid, gained precipitation again into the first cyclone 13
Thing, desulfurated plaster, desulfurization wastewater mixture enter vacuum belt filter 14, and filtering emission is carried out to mixture.
Obtained sulfur trioxide removes liquid by the removing liquid transfer pipeline being connected with pH adjusting meanss, is delivered to setting
The first shower nozzle 9 between economizer 2 and SCR reactors 3, the second shower nozzle being arranged between SCR reactors 3 and air preheater 4
10th, the 3rd shower nozzle 11 that is arranged between air preheater 4 and electric dust collector 5 and it is arranged between electric dust collector 5 and desulfurizing tower 6
The 4th shower nozzle 12, sulfur trioxide removing liquid mist be sprayed in boiler flue 8, removing flue gas in sulfur trioxide, simultaneously promote
Enter the oxidation of element mercury.
By taking certain power plant 600WM units as an example, total exhaust gas volumn 2.16*106Nm3/ h, the yield of desulfurization wastewater is 6.75m3/
H, wherein, the desulfurization wastewater sprinkling flow at the first shower nozzle 9, the second shower nozzle 10, the 3rd shower nozzle 11 and the 4th shower nozzle 12 is respectively
3m3/h、1.5m3/h、1.5m3/h、0.75m3/ h, spray droplet particle diameter is 20-50 μm.It is used as convertible reality of the present utility model
Apply the desulfurization wastewater at example, the first flusher 9, the second flusher 10, the 3rd flusher 11 and the 4th flusher 12
It can also be respectively 2.5m to spray flow3/h、2.5m3/h、1m3/h、0.75m3/ h, spray droplet particle diameter can also be 60-80 μ
M, can realize the purpose of this utility model, belong to protection domain of the present utility model.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among the protection domain that variation is created still in the utility model.
Claims (10)
1. one kind utilizes SO in desulfurization wastewater removing boiler smoke3System, including be connected with desulfurizing tower desulfurization wastewater processing
System, and sulfur trioxide removing liquid spraying system, it is characterised in that
The desulfurization wastewater treatment system, including the first cyclone, pH adjusting meanss, the second cyclone being sequentially connected with, are used to
Desulfurization wastewater successively progress is handled and obtains sulfur trioxide removing liquid；
The sulfur trioxide removes liquid spraying system, including removing liquid transfer pipeline and the shower nozzle being arranged in boiler flue, institute
The entrance point for stating removing liquid transfer pipeline is connected with second cyclone, the port of export of the removing liquid transfer pipeline and institute
State shower nozzle to be connected, the sulfur trioxide obtained after the processing of the second cyclone removing liquid is sprayed in boiler flue.
2. SO in utilization desulfurization wastewater removing boiler smoke according to claim 13System, it is characterised in that it is described de-
Sulphur tower is connected with the afterbody of boiler flue, to receive boiler smoke and carry out desulfurization process to it；
Along the flow direction of boiler smoke, be disposed with the boiler flue economizer, SCR reactors, air preheater and
Electric dust collector.
3. SO in utilization desulfurization wastewater removing boiler smoke according to claim 23System, it is characterised in that the province
The first shower nozzle is provided between coal device and the SCR reactors.
4. SO in utilization desulfurization wastewater removing boiler smoke according to claim 33System, it is characterised in that it is described
The second shower nozzle is provided between SCR reactors and the air preheater.
5. SO in utilization desulfurization wastewater removing boiler smoke according to claim 43System, it is characterised in that the sky
The 3rd shower nozzle is provided between pre- device and the electric dust collector.
6. SO in boiler smoke is removed according to any described utilization desulfurization wastewaters of claim 2-53System, its feature exists
In being provided with the 4th shower nozzle between the electric dust collector and the desulfurizing tower.
7. SO in utilization desulfurization wastewater removing boiler smoke according to claim 63System, it is characterised in that described
One cyclone bottom is also associated with vacuum belt filter.
8. SO in utilization desulfurization wastewater removing boiler smoke according to claim 73System, it is characterised in that the pH
Adjusting means is provided with chemicals dosing plant, to add processing of the chemicals realization to waste water.
9. SO in utilization desulfurization wastewater removing boiler smoke according to claim 83System, it is characterised in that the pH
Adjusting means is provided with agitating device, to be stirred to waste water and the chemicals added, realizes and waste water and chemistry are made
Agent is sufficiently mixed.
10. SO in utilization desulfurization wastewater removing boiler smoke according to claim 93System, it is characterised in that it is described
Desulfurizing tower is additionally provided with fume extractor, to discharge the boiler smoke after being handled through the desulfurizing tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621333128.0U CN206512015U (en) | 2016-12-05 | 2016-12-05 | One kind utilizes SO in desulfurization wastewater removing boiler smoke3System |
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| CN201621333128.0U CN206512015U (en) | 2016-12-05 | 2016-12-05 | One kind utilizes SO in desulfurization wastewater removing boiler smoke3System |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106630269A (en) * | 2016-12-05 | 2017-05-10 | 中国华电集团科学技术研究总院有限公司 | Method and system for desorbing SO3 in flue gas of boiler by using desulfurization waste water |
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2016
- 2016-12-05 CN CN201621333128.0U patent/CN206512015U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106630269A (en) * | 2016-12-05 | 2017-05-10 | 中国华电集团科学技术研究总院有限公司 | Method and system for desorbing SO3 in flue gas of boiler by using desulfurization waste water |
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