CN108479382A - A kind of rotary kiln exhaust gas purification method - Google Patents

A kind of rotary kiln exhaust gas purification method Download PDF

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Publication number
CN108479382A
CN108479382A CN201810291241.4A CN201810291241A CN108479382A CN 108479382 A CN108479382 A CN 108479382A CN 201810291241 A CN201810291241 A CN 201810291241A CN 108479382 A CN108479382 A CN 108479382A
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rotary kiln
exhaust gas
kiln exhaust
gas purification
charcoal
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CN201810291241.4A
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CN108479382B (en
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李世平
卢宇
王志斌
韦国龙
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Guizhou Environmental Protection Technology Co Ltd Of Htc
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Guizhou Environmental Protection Technology Co Ltd Of Htc
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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
    • B01D53/005—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 by heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
    • 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
    • B01D53/007—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 by irradiation
    • 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
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • B01D53/8609—Sulfur oxides
    • 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
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/806—Microwaves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The present invention relates to rotary kiln technology, specifically a kind of rotary kiln exhaust gas purification method.The present invention is using activated-charcoal column or coke column under the heatable catalytic effect of microwave radiation, the sulfur dioxide and nitrogen oxides restored in tail gas is elementary sulfur and nitrogen, make elementary sulfur reside in activated carbon grain to be recycled, makes nitrogen with the exhaust emissions containing carbon monoxide and carbon dioxide.Environmental pollution will not be caused, traditional handicraft is overcome and is unable to deep purifying, generates the shortcomings that a large amount of waste water cause difficulty of governance.And under preferred microwave frequency, make the sulfur dioxide in rotary kiln exhaust gas and NOXReduction efficiency obtained larger promotion.

Description

A kind of rotary kiln exhaust gas purification method
Technical field
The present invention relates to rotary kiln technology, specifically a kind of rotary kiln exhaust gas purification method.
Background technology
Rotary kiln be used for redox volatilized metal raw mineral materials and various metallurgical slags when, will configure coal reductant and Drum hot wind carries out, and after bag collection and electrostatic dust collection, the exhaust temperature of discharge reaches at 150-180 DEG C containing sulfur dioxide 300mg/Nm3More than, nitrogen oxides reaches 500mg/Nm3More than, dust-laden is also in 50mg/Nm3Left and right.Such tail gas must be net Change could discharge.Using rotary kiln carry out substance oxidation or reduction roasting or sulfating roasting all can output containing sulfur dioxide and The exceeded tail gas of nitrogen oxides.
In order to purify rotary kiln exhaust gas, traditional handicraft is to use the adjusting slurry pair containing lye or milk of lime or metal oxide Tail gas carries out spray washing and obtains containing sulfate or sulphite and nitrite waste water and cleaning of off-gas.Due to sulfur dioxide and The solubility of nitrogen oxides in a liquid is limited, and nozzle or multi-stage spray tower string need to be arranged at many levels in spray column for spray washing Connection carries out, even all standing, high-pressure spraying washing, the sulfur dioxide in tail gas and nitrogen oxides of purification are all difficult to drop to 100mg/Nm3Rotary kiln exhaust gas is required to reach 400mg/Nm containing sulfur dioxide hereinafter, this is exactly GB25466-20103Original below Cause.
Traditional handicraft will also generate a large amount of spray washing waste water, wherein containing sulfate or sulphite not only etching apparatus, And qualified discharge is wanted to also need to consume a large amount of manpowers, material resources are administered.The economic value that gained administers product is low, even It can only buried or stockpiling.
Therefore, finding one kind can make rotary kiln exhaust gas be fully purified, and not will produce the rotary kiln of a large amount of waste water Exhaust purifying method is the task of top priority.
Invention content
In order to solve the above technical problems existing in the prior art, the present invention provides a kind of rotary kiln exhaust gas purification side Method is achieved through the following technical solutions：
A kind of rotary kiln exhaust gas purification method by rotary kiln exhaust gas by activated carbon grain, and imposes microwave to activated carbon grain Radiation obtains scrubbing CO_2 and NOXAnd the cleaning of off-gas of soot dust granule, enter back into rotary kiln emptying air flue emission.
Preferably, the activated carbon grain includes raw granulate fraction and fine fraction, and raw granulate fraction has good mistake Filter flue dust and the effect convenient for flue gas circulation, it may have certain scrubbing CO_2 and NOXEffect；Fine fraction structure It is more fine and closely woven, scrubbing CO_2 and NO larger with smoke contacts areaXEffect it is preferable, but easily by the flue dust in flue gas Equal solid matters block, and cause flue gas to decline by effect, further result in scrubbing CO_2 and NOXEffect be lower.
The activated carbon of the raw granulate fraction is the coke granule that granularity is 3-5cm, and the activated carbon of fine fraction is grain Degree is the active carbon particle or coke granule of 1-2cm.
Granularity is the coarse granule of 3-5cm, has the effect of good filtering smoke and convenient for flue gas circulation undersized meeting Cause flue gas circulation effect to decline, needs to be replaced frequently or clear up raw granulate fraction；Granularity, which crosses conference, causes flue gas to pass through speed Degree is very fast, declines to the adsorption capacity of the solid matters such as flue dust in flue gas, brings larger pressure to fine grained part, influences thin The service life of grain part.
Granularity is the fine grained of 1-2cm, and charcoal can be by sulfur dioxide and NOXIt is reduced to S simple substance and nitrogen, the granularity Particle can preferably remove sulfur dioxide and NO in flue gasX, and will not circulate to flue gas and cause too much influence, and micro- Under the promotion of wave, removal effect can further be reinforced, but the granularity holds the absorption of the solid matters such as flue dust in flue gas Loading capability is weaker, as being easy to block when containing solid matter in flue gas, needs often to clear up and replace.
Coke strength is high, and concrete dynamic modulus rate, absorption property is good, and retaining power is strong, is a kind of large specific surface area, adsorption energy The strong adsorbent of power, whole adsorption effect and activated carbon are suitable, are intercepting the solid matters such as flue dust, and after a large amount of absorption still Flue gas can be kept to flow smoothly etc. has greater advantage compared with activated carbon, and since about more than 4,000 ten thousand tons of output is useless every year in China Coke causes its cheap, is more suitable for industry.
Absorbent charcoal material is that have prodigious specific surface area, to gas, solution by the amorphous carbon obtained by working process In inorganic or organic substance and colloidal solid etc. have good adsorption capacity.The desulphurization and denitration processing effect of absorbent charcoal material Fruit is preferable.
Microwave radiation only is imposed to fine fraction.The specific surface area of fine fraction is larger, by sulfur dioxide and NOXAlso Originally it was that the reaction of S simple substance and nitrogen is reacted more in fine fraction, only imposing microwave radiation to fine fraction can subtract Few energy waste, and remove the sulfur dioxide in flue gas and NOXEffect can't be by too big influence.
The microwave radiation, frequency 300-400GHz, power 1-10kW.Frequency is 300-400GHz, and power is The microwave radiation of 1-10kW, heatable catalytic effect is preferable, at this time sulfur dioxide and NOXReduction effect be far above other frequencies.
The activated carbon grain, is irregularly cleared up, and is recycled wherein elementary sulfur and is continuing with after supplementing new carbon granule.Dioxy Obtained sulphur simple substance can be accumulated in activated carbon after changing sulphur reduction, such as can cause to block without clearing up, influence flue gas by effect Fruit, and in sulfur dioxide and NOXActivated carbon can be consumed in reduction reaction, it is therefore desirable to be replenished in time.
The activated carbon grain is using activated-charcoal column made of activated carbon grain.Activated-charcoal column is made in activated carbon, make its with Rotary kiln exhaust gas discharge flue has higher compatible degree, the purification of rotary kiln exhaust gas preferably.
The activated-charcoal column, diameter are the 80-90% of rotary kiln exhaust gas emptying flue diameter, and length is rotary kiln exhaust gas Empty the 20-30% of flue length.This diameter may insure that flue gas fully by activated-charcoal column, will not leak, and obtain adequately Purification；Charcoal column length is too small, and that gas can be caused to be unable to get is sufficiently cleaned up, and needs often to clear up and replace charcoal post, and length is long It can cause to block using front more long afterwards, rear portion can not react with tail gas, and purification efficiency is caused to decline, and flue gas is by slow, Influence production, it is still necessary to replace, lead to cost of idleness, when charcoal column length is the 20-30% that rotary kiln exhaust gas empties flue length When, it sufficiently cleaned up tail gas and can cause to waste, cost is caused to increase.
The activated-charcoal column is made of coarse granule charcoal post and fine grained charcoal post, and coarse granule charcoal post is located at fine grained charcoal post two End forms front-end and back-end.The coarse granule charcoal post of front end is mainly used for filtering smoke and circulates convenient for flue gas, the fine grained in stage casing Charcoal post is mainly used for restoring the sulfur dioxide and nitrogen oxides in flue gas, the coarse granule charcoal post of front end under the heatable catalytic of microwave It is mainly used for absorbing the part sulfur vapor generated, and prevents the external world from being impacted to the fine grained charcoal post in stage casing
The length of the front and back end coarse granule charcoal post is all the 20% of particulate charcoal column length.This collocation is relatively reasonable, not only Clean-up effect is preferable, and the service life of coarse granule charcoal post and fine grained charcoal post is close, convenient disposable replacement.
Compared with prior art, the technique effect of the invention is embodied in：
The present invention under the heatable catalytic effect of microwave radiation, restores the dioxy in tail gas using activated-charcoal column or coke column It is elementary sulfur and nitrogen to change sulphur and nitrogen oxides, so that elementary sulfur is resided in activated carbon grain and is recycled, makes nitrogen with containing an oxygen Change the exhaust emissions of carbon and carbon dioxide.Environmental pollution will not be caused, traditional handicraft is overcome and is unable to deep purifying, is generated a large amount of Waste water causes the shortcomings that difficulty of governance.And under preferred microwave frequency, make the sulfur dioxide in rotary kiln exhaust gas and NOX's Reduction efficiency has obtained larger promotion.
Specific implementation mode
It is limited with reference to specific embodiment technical scheme of the present invention is further, but claimed Range describes made by being not only limited to.
Certain rotary kiln A generates tail gas 520mg/Nm containing sulfur dioxide when carrying out zinc leaching residue redox volatilization3, NOX780mg/Nm3, dust-laden 56mg/Nm3, rotary kiln exhaust gas discharge flue diameter 1.2m, height 10m.
Embodiment 1
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 350GHz, General power 6kW.Coarse grain charcoal post is packed into 4cm coke granules, and particulate charcoal post is packed into the activated carbon of 1.5cm, exhaust emissions flue top The air-introduced machine air inducing pumping of 2kW is installed.
Embodiment 2
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
Activated-charcoal column diameter 0.96m, length 2m is made with porcelain plate, wherein fine grained charcoal post 1.4m, two sections of coarse granule charcoal post, Each 0.3m is respectively placed in fine grained charcoal post both sides.It is horizontal to be installed between the outlet of rotary kiln bag collection and exhaust emissions flue. Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, and carries out microwave heating catalysis, microwave frequency 300GHz, total work Rate 1kW.Coarse grain charcoal post is packed into 3cm coke granules, and particulate charcoal post is packed into the activated carbon of 1cm, and 2kW is installed on exhaust emissions flue top Air-introduced machine air inducing pumping.
Embodiment 3
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
Activated-charcoal column diameter 1.08m, length 3m is made with porcelain plate, wherein fine grained charcoal post 2.1m, two sections of coarse granule charcoal post, Each 0.45m is respectively placed in fine grained charcoal post both sides.It is horizontal be installed on rotary kiln bag collection outlet and exhaust emissions flue it Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 400GHz, always Power 10kW.Coarse grain charcoal post is packed into 5cm coke granules, and particulate charcoal post is packed into the activated carbon of 2cm, the installation of exhaust emissions flue top The air-introduced machine air inducing of 2kW is evacuated.
Embodiment 4
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 350GHz, General power 6kW.Coarse grain charcoal post is packed into 4cm coke granules, and particulate charcoal post is packed into the coke granule of 1.5cm, exhaust emissions flue top The air-introduced machine air inducing pumping of end installation 2kW.
Embodiment 5
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Whole charcoal posts are placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 350GHz, General power 6kW.Coarse grain charcoal post is packed into 4cm coke granules, and particulate charcoal post is packed into the activated carbon of 1.5cm, exhaust emissions flue top The air-introduced machine air inducing pumping of 2kW is installed.
Embodiment 6
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein coarse granule charcoal post 1.8m, fine grained charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 350GHz, General power 6kW.Coarse grain charcoal post is packed into 4cm coke granules, and particulate charcoal post is packed into the activated carbon of 1.5cm, exhaust emissions flue top The air-introduced machine air inducing pumping of 2kW is installed.
Embodiment 7
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 350GHz, General power 6kW.Slightly, particulate charcoal post is packed into the activated carbon of 1.5cm, and the air-introduced machine air inducing of 2kW is installed on exhaust emissions flue top Pumping.
Embodiment 8
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 350GHz, General power 6kW.Slightly, particulate charcoal post is packed into the coke granule of 4cm, and the air-introduced machine air inducing of 2kW is installed on exhaust emissions flue top Pumping.
Embodiment 9
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 450GHz, General power 6kW.Coarse grain charcoal post is packed into 4cm coke granules, and particulate charcoal post is packed into the activated carbon of 1.5cm, exhaust emissions flue top The air-introduced machine air inducing pumping of 2kW is installed.
Embodiment 10
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, progress microwave heating catalysis, microwave frequency 250GHz, General power 6kW.Coarse grain charcoal post is packed into 4cm coke granules, and particulate charcoal post is packed into the activated carbon of 1.5cm, exhaust emissions flue top The air-introduced machine air inducing pumping of 2kW is installed.
Embodiment 11
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Particulate charcoal post is placed in the microwave field that 4 micro-wave oven series connection generate, and carries out microwave heating catalysis, microwave frequency 2.45GHz, general power 6kW.Coarse grain charcoal post is packed into 4cm coke granules, and particulate charcoal post is packed into the activated carbon of 1.5cm, exhaust emissions Flue top is installed by the air-introduced machine air inducing pumping of 2kW.
Comparative example 1
A kind of rotary kiln exhaust gas purification method, carries out by the following method：
With porcelain plate making activated-charcoal column diameter 1.02m, length 2.5m, wherein fine grained charcoal post 1.8m, coarse granule charcoal post two Section, each 0.35m are respectively placed in fine grained charcoal post both sides.It is horizontal to be installed on the outlet of rotary kiln bag collection and exhaust emissions flue Between.Coarse grain charcoal post is packed into 4cm coke granules, and particulate charcoal post is packed into the activated carbon of 1.5cm, the installation of exhaust emissions flue top The air-introduced machine air inducing of 2kW is evacuated.
The tail gas generated in rotary kiln A is handled with each embodiment 1-11, comparative example 1 and conventional method.
The conventional method is as follows：
Using traditional handicraft lye or limewash three-level spray removal sulfur dioxide and flue dust.Spray liquid 5-10m3/ hour, In 8 hours spray initial stages, cleaning of off-gas 300-400mg/Nm containing sulfur dioxide3, NOX420-500mg/Nm3, dust-laden 40-50mg/ Nm3, spray liquid recycling 24 hours, cleaning of off-gas 480-520mg/Nm containing sulfur dioxide3, NOX600-750mg/Nm3, dust-laden 50-56mg/Nm3, PH=2-3, spray liquid fails substantially, needs replacing processing.It is returned after being neutralized using alkali or lime and uses two Secondary, spray piping and filter press pipeline generate a large amount of sulfate and sulphite crystallization, are also generated in Sprayer Circulation pond big The sulphate crystal of amount, carrying out cleaning could maintain normally to produce.Cleaning gained sulphate crystal product due to purity not It is enough, it cannot utilize, inventory or buried underground can only be stacked, also be easy to cause secondary pollution.
The embodiment 1-11, the handling result of comparative example 1 are as follows：
There is the unsmooth phenomenon of flue gas circulation after 50h in embodiment 6.It is unsmooth existing that flue gas circulation occurs after 43h in embodiment 7 As.
From the foregoing, it will be observed that the method for the present invention can fully remove sulfur dioxide, NO in rotary kiln production tail gasXAnd flue dust, Rotary kiln is produced into tail gas clean-up and is less than 100mg/Nm to sulfur dioxide3, NOXLess than 200mg/Nm3, dust-laden is less than 20mg/Nm3, Clean-up effect is much better than traditional handicraft, and purification process does not generate sulfate or sulphite, nitrite waste water, not only reduces The sour corrosion of equipment, and avoid the difficulty of governance of acid waste water.Greatly reduce the cost of tail gas clean-up.
Finally it is pointed out that above example is only the more representational example of the present invention.Obviously, technology of the invention Scheme is not limited to above-described embodiment, and acceptable there are many deformations.Those skilled in the art can be from disclosed by the invention All deformations that content is directly exported or associated, are considered as protection scope of the present invention.

Claims (10)

1. a kind of rotary kiln exhaust gas purification method, which is characterized in that by rotary kiln exhaust gas by activated carbon grain, and to activated carbon grain Microwave radiation is imposed, scrubbing CO_2 and NO are obtainedXAnd the cleaning of off-gas of soot dust granule, enter back into rotary kiln emptying flue row It puts.
2. rotary kiln exhaust gas purification method according to claim 1, which is characterized in that the activated carbon grain includes coarse granule Part and fine fraction.
3. rotary kiln exhaust gas purification method according to claim 2, which is characterized in that the activated carbon of the raw granulate fraction It is the coke granule that granularity is 3-5cm, the activated carbon of fine fraction is active carbon particle or coke that granularity is 1-2cm Grain.
4. rotary kiln exhaust gas purification method according to claim 2, which is characterized in that only impose microwave to fine fraction Radiation.
5. rotary kiln exhaust gas purification method according to claim 1, which is characterized in that the microwave radiation, frequency are 300-400GHz, power 1-10kW.
6. rotary kiln exhaust gas purification method according to claim 1, which is characterized in that the activated carbon grain, irregularly into Row cleaning is recycled wherein elementary sulfur and is continuing with after supplementing new carbon granule.
7. according to claim 1-6 any one of them rotary kiln exhaust gas purification methods, which is characterized in that the activated carbon grain, It is using activated-charcoal column made of activated carbon grain.
8. rotary kiln exhaust gas purification method according to claim 7, which is characterized in that the activated-charcoal column, diameter are Rotary kiln exhaust gas empties the 80-90% of flue diameter, and length is the 20-30% of rotary kiln exhaust gas emptying flue length.
9. rotary kiln exhaust gas purification method according to claim 7, which is characterized in that the activated-charcoal column, by coarse granule Charcoal post and fine grained charcoal post composition, coarse granule charcoal post are located at fine grained charcoal post both ends, form front-end and back-end.
10. rotary kiln exhaust gas purification method according to claim 7, which is characterized in that the front and back end coarse granule charcoal post Length be all the 20% of particulate charcoal column length.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109847570A (en) * 2019-04-08 2019-06-07 东北大学 The method of microwave plasma auxiliary activity charcoal reduction NO is utilized under low temperature excess oxygen
CN116531938A (en) * 2023-05-31 2023-08-04 广西粤桥新材料科技有限公司 Rotary kiln tail gas clean-up system

Citations (3)

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