CN106345263A - System and method for flue gas desulfurization - Google Patents
System and method for flue gas desulfurization Download PDFInfo
- Publication number
- CN106345263A CN106345263A CN201610951441.9A CN201610951441A CN106345263A CN 106345263 A CN106345263 A CN 106345263A CN 201610951441 A CN201610951441 A CN 201610951441A CN 106345263 A CN106345263 A CN 106345263A
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- CN
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- Prior art keywords
- flue gas
- zinc oxide
- desulfurizing tower
- serosity
- zinc
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses a system and method for flue gas desulfurization. The method comprises the following steps: inputting flue gas to be treated to the bottom of a desulfurizing tower, inputting zinc oxide slurry from an upper section of the desulfurizing tower, and enabling the flue gas to be treated and the zinc oxide slurry to contact with each other and flow in opposite directions in the desulfurizing tower; introducing an oxidizing gas from the bottom of the desulfurizing tower to oxidize zinc sulfite, which is generated by the contact of the flue gas and the zinc oxide slurry, into zinc sulfate; and delivering the slurry after absorption of SO2 in the desulfurizing tower to the top of the desulfurizing tower for cyclic utilization. The principle is that SO2 in the flue gas reacts with zinc oxide to generate zinc sulfite, and then the zinc sulfite is oxidized into zinc sulfate by using air, thereby achieving the aim of desulfurization. The desulfurization efficiency of the system and method disclosed by the invention reaches 96% or above, no waste liquid is discharged, and the raw materials are low in price and can be used repeatedly, so that the system and the method meet requirements for clean production.
Description
Technical field
The present invention relates to waste is processed and environmental protection technical field, relate more specifically to a kind of flue gas desulphurization system and side
Method.
Background technology
China is zinc manufacturing country maximum in the world, and zinc yield is the first in the world.The smelting process of zinc can be divided into pyrogenic process and
Wet method two big class.But most zinc manufacturing enterprises adopt thermal process, smelting process produces and contains so in a large number2Flue gas；Even if using wet
Method is smelted, and the volatilization of the drying of its raw material, roasting and leached mud processes also can produce and contains so in a large number2Flue gas.These flue gas numbers
Amount is big, so2Concentration is low.
The increasingly stringent requiring with Environmental Protection in China, the lead especially coming into effect from 1 day October in 2010, Zn Cr coating are dirty
Dye discharge new standard is it is desirable to so in newly-built enterprise atmosphere pollution2Concentration of emission controls in 400mg/nm3Hereinafter, the enterprise adding
Industry Air Pollutant Emission source is more, in order to meet the requirement of overall control, so2Concentration of emission needs to control lower dense
Degree.Therefore, the process of such flue gas also just becomes the task of top priority.
Both at home and abroad to low concentration so2The method of fume treatment is a lot, has Wet Limestone/lime-gypsum using more
Method, sodium alkali, renewable solvent absorption cycle and ammonia process etc..But more or less all also there are various defects in these methods, than
If desired for consuming a lot of industrial chemicals, apparatus expensive, operating cost height etc., therefore how to develop a kind of brand-new desulfuration efficiency
High, cheap, cleaning and no garbage produce sulfur method be exactly problem currently in the urgent need to address.
Content of the invention
In view of this, present invention is primarily targeted at providing a kind of flue gas desulphurization system and method, to solve above-mentioned skill
At least one of art problem, preferably can also solve the desulphurization problem in domestic garbage pyrolysis gasification simultaneously.
To achieve these goals, as one aspect of the present invention, the invention provides a kind of flue gas desulphurization system, its
It is characterised by, comprising:
Desulfurizing tower, for carrying out desulfurization process to the flue gas inputting；
Wherein, described desulfurizing tower epimere is provided with zinc oxide injection point, for inputting zinc oxide serosity；Described desulfurizing tower
Bottom is provided with smoke inlet, for inputting pending flue gas；Described desulfurization top of tower is provided with exhanst gas outlet, for discharging
Flue gas after process；Described desulfurizing tower bottom section is additionally provided with zinc oxide slurry discharge ports, for will be reacted for zinc oxide serosity
Product discharges described desulfurizing tower；And
In described desulfurizing tower tower body, the flue gas of input with described zinc oxide slurry liquid contacts and flows to contrary.
Wherein, the solid phase weight concentration of the zinc oxide serosity of described zinc oxide injection point input is 8-10%.
Wherein, described desulfurizing tower adopts spray-absorption mode, preferably includes four spraying layers, two demister layers.
Wherein, described flue gas desulphurization system also includes providing the flue gas booster fan of power to the flue gas of input；
Preferably, described desulfurization tower bottom is additionally provided with air oxygen activating QI entrance, for introduction of oxidative gas, by cigarette
The zinc sulfite generating after gas and zinc oxide slurry liquid contacts is oxidized to zinc sulfate.
Wherein, described flue gas desulphurization system also includes zinc oxide serosity device for making, described zinc oxide serosity device for making
For the raw material containing zinc oxide and water are configured to serosity, and it is transported to described zinc oxide injection point；
Preferably, described flue gas desulphurization system also includes circulating slot and circulating pump, the zinc oxide serosity of desulfurization tower bottom
The reacted product of zinc oxide serosity that outlet is discharged is imported into described circulating slot, then through de- described in described circulation pumped back
Sulfur tower recycles.
Preferably, described flue gas desulphurization system also includes dehydration device and oxidation unit, for respectively by described circulation
The serosity of trench bottom carries out processed, and zinc sulfate is made in the serosity oxidation after processed.
Wherein, the oxidation in described desulfurizing tower adopts bubbling air mode of oxidizing, and described desulfurizing tower is included positioned at bottom of towe
Oxidation pond, is also configured with oxidation fan and the aeration tube being connected with described air oxygen activating QI entrance.
Wherein, described flue gas desulphurization system also includes rubbish is carried out with the rotary kiln of burning disposal, described desulfurization tower flue gas
The flue gas producing for described rotary kiln of entrance input.
Wherein, described rotary kiln feeds by the way of hydraulic feed, and feed rate is 170-200kg/h, and inlet amount is
2-2.4 ton day；
Preferably, described rotary kiln includes drying oven and pyrolysis gasification furnace, its inclination angle is 1.5 °, and draw ratio is 1.2；
Preferably, the rotating speed of described rotary kiln is 2r/min.
As another aspect of the present invention, present invention also offers a kind of fume desulphurization method it is characterised in that include with
Lower step:
Pending flue gas is inputted desulfurization tower bottom, zinc oxide serosity is inputted from described desulfurizing tower epimere, makes to wait to locate
The flue gas of reason is contacted in desulfurizing tower with described zinc oxide serosity and flows to contrary；
It is passed through oxidizing gas from desulfurization tower bottom, the zinc sulfite that flue gas is generated with zinc oxide slurry liquid contacts is oxidized to
Zinc sulfate；
So is absorbed in desulfurizing tower2Serosity afterwards is sent to desulfurization top of tower and recycles.
Wherein, described pending flue gas comes from the rotary kiln burnt away the refuse.
Understand, the present invention compared with prior art has the advantage that based on technique scheme
(1) present invention combines traditional sulfur removal technology research and development it is proposed that a kind of efficient desulphurization system technique, and desulfuration efficiency reaches
To more than 96%；
(2) improve the oxygenation efficiency of zinc sulfite, decrease zinc sulfite crystal to system wear and blocking；
(3) desulfurizing tower by the way of Multi-layer sprinkling so that flue gas is more efficiently sufficiently absorbed with zinc oxide serosity；
(4) reached the requirement of the balance of system water resource it is achieved that water balance and between upper next procedure, no waste liquid row
Put；
(5) raw material oxide powder and zinc can be obtained using flue dust, waste residue and waste electrolyte that zinc metallurgical process produces, and source is wide
General, cheap, and oxide powder and zinc can return and do absorbent, recycling；The method is applied to zinc abstraction enterprise not to be existed
The problem how raw material sources and product are disposed, can realize recycling and so of zno simultaneously2Utilization, no other discard
Thing produces, and meets the requirement of clean manufacturing.
Brief description
Fig. 1 is the rotary kiln type process house refuse of the present invention and its structural representation of flue gas purifying technique system.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in further detail.
The present invention relates to a kind of flue gas purifying technique, in the serosity absorption flue gas that this technology utilization zinc oxide is prepared with water
so2, reach the purpose of purifying smoke.The present invention passes through technology controlling and process and adjustment, makes zinc sulfite crystallize nucleus quantity and increases
Plus, control its particle diameter to increase, slow down its deposition, abrasion, blocking ability.It is well known that ph value is inclined in circulating absorption solution
Low, be conducive to improving zinc sulfite oxygenation efficiency, but be unfavorable for so2Absorb；Circulating absorption solution ph value is higher, is conducive to improving so2Inhale
Yield, is unfavorable for that zinc sulfite aoxidizes again；And the present invention passes through technology controlling and process it is achieved that so in flue gas2Absorbance and sulfurous acid
The control of zinc oxygenation efficiency.The present invention is adjusted by internal process, the water resource in conjunction with next procedure it is achieved that systematic water balance,
No new discharging of waste liquid.
Zinc oxide method of the present invention is a kind of sulfur method for zinc abstraction factory flue gas, and its raw material zno powder can
It is obtained with flue dust, waste residue and the waste electrolyte being produced using zinc metallurgical process, for absorbing so in flue gas2Gas, generates and produces
Thing can be zinc sulfite solid, zinc sulfate liquid or zinc sulfate solid.Zinc sulfite solid can pass through heat resolve or acid
It is decomposed into zno and so2, zno return be absorbent, so2Sulphuric acid or liquid so processed can be produced2；Can also by heat resolve or
Zno and so is decomposed in acid2, zno return be absorbent, so2Sulphuric acid or liquid so processed can be produced2, desulfuration efficiency reach 96% with
On；Solvable zinc sulfate can also be oxidized to by oxidizing process just zinc sulfite, solution of zinc sulfate or obtain by evaporative crystallization
To zinc sulfate solid all can return smelting shop recycling.Thus, it could be seen that the method is applied to zinc abstraction enterprise not depositing
The problem how disposed in raw material sources and product, can realize recycling and so of zno simultaneously2Utilization, no other give up
Gurry produces, and meets the requirement of clean manufacturing.And the present invention further applied rotary kiln type process house refuse and its
Flue gas purifying technique, equally achieves gratifying effect.
Specifically, the method for the present invention comprises the following steps:
It is producing of zinc oxide serosity first, Zinc oxide powder and fresh water (FW) are stirred in a band according to certain ratio
Groove in carry out being configured to serosity.Technological requirement zinc oxide paste liquid-solid phase mass concentration is 10%.Pulping system capital equipment is
Slurrying pond, for completing technique purpose, pulping system includes zinc oxide feed bin, zinc oxide metering, fresh water (FW) metering and serosity output
Pump.
The serosity producing is pumped into desulfurizing tower through circulation, and desulfurizing tower absorbs the spray-absorption side using traditional desulfurization
Formula, capital equipment is desulfurizing tower.Desulfurizing tower adopts four layers of spraying layer, 2 layers of demister.Supporting 4 desulfuration recycle pumps of desulfurizing tower, with
And a desulphurization circulating pond.Serosity after completing desulfurization needs to deliver to oxidative system to carry out aoxidizing extracting sulfuric acid zinc.
Oxidative system nucleus equipment is oxidation pond.Oxidation pond adopts traditional bubbling air mode of oxidizing.Therefore, oxidation system
System, in addition to oxidation pond, is also configured with oxidation fan and aeration tube.Completing the serosity after aoxidizing send factory cleaning shop to enter
The slagging-off of one step, concentration, crystallization etc..Oxidative system is also configured with slurry feeding pump.
In addition to system above, desulphurization system also should have flue gas system, including flue gas into and out of desulfurizing tower flue,
And the flue gas booster fan of power is provided by desulfurizing tower to flue gas.
Below in conjunction with the accompanying drawings, a kind of rotary kiln type proposed by the present invention is described in further detail by specific embodiment and processes village
Town house refuse and its flue gas purifying technique, skilled artisans appreciate that and realize technical solutions according to the invention,
And effect of the present invention can be reached.
Embodiment 1
Referring to Fig. 1, implement a kind of rotary kiln type proposed by the present invention and process villages and small towns house refuse and its flue gas purifying technique,
Main include drying oven, dry distilling carbide furnace, slurrying pond, circulatory pool, absorption tower, demister, oxidation trough, oxidation fan, filter,
Depurator, flue gas booster fan, aeration tube, circulating pump, slurry feeding pump, zinc oxide feed bin etc..Rotary system is rubbish first
The early stage screening of rubbish and broken, the then heat treatment of rubbish drying stove and dry distilling carbide furnace again, after heat treatment flue gas be sent to de-
Sulfur system.Desulphurization system is producing of zinc oxide serosity first, by Zinc oxide powder and fresh water (FW) according to certain ratio one
Carry out being configured to serosity in the individual groove with stirring.Technological requirement zinc oxide paste liquid-solid phase weight concentration 10%.Main in pulping process
Want equipment be slurrying pond, for completing technique purpose, pulping system include zinc oxide feed bin, zinc oxide metering, fresh water (FW) metering and
Serosity rear pump.The serosity producing is pumped into desulfurizing tower through circulation, and desulfurizing tower absorbs the spray-absorption using traditional desulfurization
Mode, capital equipment is desulfurizing tower.Desulfurizing tower adopts four layers of spraying layer, 2 layers of demister.Supporting 4 desulfuration recycle pumps of desulfurizing tower,
And a desulphurization circulating pond.Serosity after completing desulfurization needs to deliver to oxidative system to carry out aoxidizing extracting sulfuric acid zinc.Oxidation
System core equipment is oxidation pond.Oxidation pond adopts traditional bubbling air mode of oxidizing.Therefore, oxidative system has gone out oxidation pond
Outside, it is also configured with oxidation fan and aeration tube.Complete aoxidize after serosity send factory cleaning shop further to remove the gred, dense
Contracting, crystallization etc..Oxidative system is also configured with slurry feeding pump.In addition to system above, desulphurization system also should have flue gas system
System, include flue gas into and out of desulfurizing tower flue, and to flue gas by desulfurizing tower offer power flue gas booster fan.
Particular embodiments described above, has carried out detailed further to the purpose of the present invention, technical scheme and beneficial effect
Describing in detail bright it should be understood that the foregoing is only the specific embodiment of the present invention, being not limited to the present invention, all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement done etc., should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of flue gas desulphurization system is it is characterised in that include:
Desulfurizing tower, for carrying out desulfurization process to the flue gas inputting；
Wherein, described desulfurizing tower epimere is provided with zinc oxide injection point, for inputting zinc oxide serosity；Described desulfurization tower bottom
It is provided with smoke inlet, for inputting pending flue gas；Described desulfurization top of tower is provided with exhanst gas outlet, processes for discharge
Flue gas afterwards；Described desulfurizing tower bottom section is additionally provided with zinc oxide slurry discharge ports, for by reacted for zinc oxide serosity product
Discharge described desulfurizing tower；And
In described desulfurizing tower tower body, the flue gas of input with described zinc oxide slurry liquid contacts and flows to contrary.
2. flue gas desulphurization system as claimed in claim 1 it is characterised in that described zinc oxide injection point input zinc oxide
The solid phase weight concentration of serosity is 8-10%.
3. flue gas desulphurization system as claimed in claim 1 is it is characterised in that described desulfurizing tower adopts spray-absorption mode；
Preferably, described desulfurizing tower includes four spraying layers, two demister layers.
4. flue gas desulphurization system as claimed in claim 1 is it is characterised in that described flue gas desulphurization system is also included to input
Flue gas provides the flue gas booster fan of power；
Preferably, described desulfurization tower bottom is not also equipped with air oxygen activating QI entrance, for introduction of oxidative gas, by flue gas with
The zinc sulfite generating after zinc oxide slurry liquid contacts is oxidized to zinc sulfate.
5. flue gas desulphurization system as claimed in claim 1 is it is characterised in that described flue gas desulphurization system also includes zinc oxide paste
Liquid device for making, described zinc oxide serosity device for making is used for for the raw material containing zinc oxide and water being configured to serosity, and conveys
To described zinc oxide injection point；
Preferably, described flue gas desulphurization system also includes circulating slot and circulating pump, the zinc oxide serosity of desulfurization tower bottom is discharged
The reacted product of zinc oxide serosity that mouth is discharged is imported into described circulating slot, then through desulfurizing tower described in described circulation pumped back
Recycle.
Preferably, described flue gas desulphurization system also includes dehydration device and oxidation unit, for respectively by described circulating slot bottom
The serosity in portion carries out processed, and zinc sulfate is made in the serosity oxidation after processed.
6. flue gas desulphurization system as claimed in claim 5 is it is characterised in that the oxidation in described desulfurizing tower adopts bubbling air
Mode of oxidizing, described desulfurizing tower includes the oxidation pond positioned at bottom of towe, is also configured with the oxygen being connected with described air oxygen activating QI entrance
Wind-transformation machine and aeration tube.
7. flue gas desulphurization system as claimed in claim 1 is it is characterised in that described flue gas desulphurization system also includes rubbish is entered
The rotary kiln of row burning disposal, the flue gas producing for described rotary kiln of described desulfurizing tower smoke inlet input.
8. flue gas desulphurization system as claimed in claim 7 is it is characterised in that the charging of described rotary kiln adopts the side of hydraulic feed
Formula, feed rate is 170-200kg/h, and inlet amount is 2-2.4 ton day；
Preferably, described rotary kiln includes drying oven and pyrolysis gasification furnace, its inclination angle is 1.5 °, and draw ratio is 1.2；
Preferably, the rotating speed of described rotary kiln is 2r/min.
9. a kind of fume desulphurization method is it is characterised in that comprise the following steps:
Pending flue gas is inputted desulfurization tower bottom, zinc oxide serosity is inputted from described desulfurizing tower epimere, makes pending
Flue gas is contacted in desulfurizing tower with described zinc oxide serosity and flows to contrary；
It is passed through oxidizing gas from desulfurization tower bottom, the zinc sulfite that flue gas is generated with zinc oxide slurry liquid contacts is oxidized to sulphuric acid
Zinc；
So is absorbed in desulfurizing tower2Serosity afterwards is sent to desulfurization top of tower and recycles.
10. fume desulphurization method as claimed in claim 9 is it is characterised in that described pending flue gas comes from burning rubbish
The rotary kiln of rubbish.
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| CN201610951441.9A CN106345263A (en) | 2016-10-27 | 2016-10-27 | System and method for flue gas desulfurization |
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| CN201610951441.9A CN106345263A (en) | 2016-10-27 | 2016-10-27 | System and method for flue gas desulfurization |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107983136A (en) * | 2017-12-21 | 2018-05-04 | 双盾环境科技有限公司 | A kind of technique of ash-laden gas recycling Sulphur ressource using after zinc calcine or zinc roasting |
| CN108014619A (en) * | 2017-11-27 | 2018-05-11 | 西北矿冶研究院 | Zinc oxide desulfurization device and method for tail gas generated in acid making through smelting |
| CN108816033A (en) * | 2018-07-09 | 2018-11-16 | 山东瑞嘉通风环保科技有限公司 | A kind of smelting acid making exhaust gas oxidation zinc desulfurizer and method |
| CN109569255A (en) * | 2018-11-29 | 2019-04-05 | 株洲冶炼集团股份有限公司 | A kind of zinc abstraction system flue gas desulfurization technique |
| CN110642286A (en) * | 2019-09-06 | 2020-01-03 | 云南中陇生态环境工程有限公司 | Method and device for deeply oxidizing zinc sulfite into zinc sulfate and application of method |
| CN111850309A (en) * | 2020-07-23 | 2020-10-30 | 宝武集团环境资源科技有限公司 | Method and device for treating secondary zinc oxide dust |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108014619A (en) * | 2017-11-27 | 2018-05-11 | 西北矿冶研究院 | Zinc oxide desulfurization device and method for tail gas generated in acid making through smelting |
| CN107983136A (en) * | 2017-12-21 | 2018-05-04 | 双盾环境科技有限公司 | A kind of technique of ash-laden gas recycling Sulphur ressource using after zinc calcine or zinc roasting |
| CN108816033A (en) * | 2018-07-09 | 2018-11-16 | 山东瑞嘉通风环保科技有限公司 | A kind of smelting acid making exhaust gas oxidation zinc desulfurizer and method |
| CN109569255A (en) * | 2018-11-29 | 2019-04-05 | 株洲冶炼集团股份有限公司 | A kind of zinc abstraction system flue gas desulfurization technique |
| CN110642286A (en) * | 2019-09-06 | 2020-01-03 | 云南中陇生态环境工程有限公司 | Method and device for deeply oxidizing zinc sulfite into zinc sulfate and application of method |
| CN111850309A (en) * | 2020-07-23 | 2020-10-30 | 宝武集团环境资源科技有限公司 | Method and device for treating secondary zinc oxide dust |
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Application publication date: 20170125 |