CN107349780A - A kind of aluminium cathode baking furnace fume Dry denitration method - Google Patents
A kind of aluminium cathode baking furnace fume Dry denitration method Download PDFInfo
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- CN107349780A CN107349780A CN201710678057.0A CN201710678057A CN107349780A CN 107349780 A CN107349780 A CN 107349780A CN 201710678057 A CN201710678057 A CN 201710678057A CN 107349780 A CN107349780 A CN 107349780A
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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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
- B01D53/565—Nitrogen oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- 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
A kind of aluminium cathode baking furnace fume Dry denitration method, it is related to a kind of processing method of aluminium cathode production process baking furnace fume.It is characterized in that its denitrification process is to spray into solid, powdery reduction denitrfying agent, solid, powdery reduction denitrfying agent thermal decomposition product and the NO in flue gas in aluminium cathode roasterxGeneration reduction reaction, by NOxIt is reduced into N2, realize denitrating flue gas.The inventive method, using efficient dry selective on-catalytic（DSNCR）Technology, directly solid, powdery reduction denitrfying agent is spurted into aluminium cathode roaster, efficiently solves calcining carbon kiln gas NOxThe problem of concentration over-standard discharges, its investment is small, and operating cost is low, simple to operate, stable, fume emission NOxQualified discharge.
Description
Technical field
A kind of aluminium cathode baking furnace fume Dry denitration method, is related to a kind of aluminium cathode production process baking furnace fume
Processing method.
Background technology
In Aluminum Electrolysis Production, aluminum carbon anode production is important step.With being continuously increased for Aluminum Electrolysis Production amount, aluminium
To persistently it be risen with the operation production capacity of carbon anode.As the propulsion that national environmental protection works, environmental protection standard are more and more stricter.
Chinese Ministry of Environmental Protection's issue in 2013《Aluminum i ndustry pollutant emission standard》（GB25465-2010）In amendment, to aluminum i ndustry feature kiln
SO in kiln gas2、NOx, particulate matter, the Air Pollutant Emission concentration such as fluorine carried out more strict limitation, wherein particle
Thing, SO2, fluorine concentration of emission be reduced to 10mg/m respectively3、100mg/m3And 3mg/m3Hereinafter, add to NOxDischarge limitation,
It is required that reach 100mg/m3Below.This proposes new environmental requirement to China's aluminum i ndustry.
Carbon roasting furnace smoke moisture is low, typically containing SO2 200-600mg/m3, NOx 300-400mg/m3, particulate matter 50-
600mg/m3, glance coal 80-300mg/m3.The desulfurization of calcining carbon kiln gas, dedusting technology comparative maturity at present, general energy
Enough requirements for meeting environmental protection.
Traditional SNCR technology denitration efficiencies are low, it is impossible to ensure baking furnace fume qualified discharge；Contain one in baking flue gas
Quantitative tar ingredients, catalyst surface oil suction can be caused to cover and fail, therefore calcining carbon kiln gas can not be taken off using SCR
Nitre technology.The denitrating flue gas of carbon roasting furnace at home and abroad can directly answer by the experience also without Engineering Projects or maturation or technology
With.Therefore calcining carbon gas denitrifying technology used for aluminium electrolysis still belongs to blank, is currently environmentally friendly and clean manufacturing urgent need to resolve ask
Topic.
The content of the invention
The purpose of the present invention is aiming at insufficient existing for above-mentioned prior art, there is provided and one kind investment is small, and operating cost is low,
It is simple to operate, it is stable, fume emission NO can be effectively ensuredxThe aluminium cathode baking furnace fume Dry denitration side of qualified discharge
Method.
The purpose of the present invention is achieved through the following technical solutions.
A kind of aluminium cathode baking furnace fume Dry denitration method, it is characterised in that its denitrification process is roasted in aluminium cathode
Burn stove and spray into solid, powdery reduction denitrfying agent, solid, powdery reduction denitrfying agent thermal decomposition product and the NO in flue gasxGeneration reduction is anti-
Should, by NOxIt is reduced into N2, realize denitrating flue gas.
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, it is characterised in that the reduction of its solid, powdery is de-
Nitre agent is made up of carbon dust, stabilizer, screening agent, reducing agent, and solid, powdery reduces the particle size range 0.01-3mm of denitrfying agent；Wherein
Carbon dust, stabilizer, screening agent, the mass ratio of reducing agent are：Carbon dust：Stabilizer：Screening agent：Reducing agent=(3-5):(0.1-
0.2):(0.1-0.4):1。
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, it is characterised in that its stabilizer is acetic acid
One or more in sodium, ammonium acetate, ammonium oxalate.
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, it is characterised in that its screening agent is lemon
Acid, the one or more of ammonium citrate.
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, it is characterised in that its reducing agent is acetic acid
One or more in ammonium, ammonium citrate, urea, ammonium carbonate, ammonium hydrogen carbonate, ammonium carbonate, ammonium sulfite, ammonium sulfate.
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, it is characterised in that the reduction of its solid, powdery is de-
Nitre agent dosage is NOx0.5-2.5 times of quality；Spray into solid-gas ratio kg/m when in roaster3For 5:1-35:1.
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, it is characterised in that the temperature of denitration reduction reaction
It is 650 DEG C -1100 DEG C to spend section.
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, it is characterised in that the reduction of its solid, powdery is de-
Nitre agent is sprayed into roaster from flame path hole of roasting furnace.
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, its denitration technology is to be based on dry selective
On-catalytic（DSNCR）Principle, i.e.,：Solid, powdery is reduced into denitrfying agent（Predominantly organic reducing agent）, will be also using compressed air
Former agent is sprayed into stove, and under suitable temperature conditionss, denitrfying agent is pyrolyzed generation gaseous hydrocarbons and a small amount of Ammonia reducing agent completely,
The NO generated in combustion processxRun into gaseous hydrocarbon (CHm) and ammonia, with NOxGeneration SNCR reacts, by NOxAlso
It is former into N2.Its course of reaction is：
CmHnOx+NO→CO2+H2O+N2
CmHnOx+NO2→CO2+H2O+N2
4NH3+4NO+O2→6H2O+4N2
A kind of aluminium cathode baking furnace fume Dry denitration method of the present invention, denitration efficiency is up to more than 80%, fume emission NOx
Concentration≤100mg/Nm3, by regulating dosage, concentration of emission can reach 50mg/Nm3Below, it is not necessary to liquefied ammonia or ammoniacal liquor etc.
Dangerous matter sources, equipment investment is small low with operating cost, installs and easy to operate.
Brief description of the drawings
Fig. 1 is the process flow diagram of the present invention.
In accompanying drawing, 1 is roaster, and 2 be denitrfying agent tank, and 3 be pulse valve, and 4 be compression gas tank.
Embodiment
A kind of aluminium cathode baking furnace fume Dry denitration method, its denitrification process are sprayed into admittedly in aluminium cathode roaster
Body powdery reduces denitrfying agent, solid, powdery reduction denitrfying agent thermal decomposition product and the NO in flue gasxGeneration reduction reaction, by NOxReduction
Into N2, realize denitrating flue gas.Denitrfying agent used is carbon dust, stabilizer, screening agent, reducing agent composition, controls denitrfying agent granularity model
Enclose 0.01-3mm scopes.Dosages distribution is according to carbon dust：Stabilizer：Screening agent：Reducing agent=(3-5):(0.1-0.2):(0.1-
0.4):1（Mass ratio）.Wherein, the carbon dust can reduce denitration temperature in use section, and conventional SNCR denitration temperature is 850oC-
1100oC, after adding carbon dust, denitration temperature range is 650oC-1100oC, percent reduction are up to 80%；The stabilizer be sodium acetate,
One or more in ammonium acetate, ammonium oxalate；The screening agent is citric acid, ammonium citrate to improve denitrfying agent surface-active
One or more；The reducing agent is ammonium acetate, ammonium citrate, urea, ammonium carbonate, ammonium hydrogen carbonate, ammonium carbonate, sulfurous acid
One or more in ammonium, ammonium sulfate.
The method of the present invention, reduces denitrfying agent by solid, powdery using compressed air, passes through the hopper top of carbon roasting furnace
Spray into roaster burning quirk.The overall mobile performance of denitrfying agent is preferable, simple compared to simple urea denitrfying agent, its conveying
Single, fusing point is high, will not be blocked in course of conveying because of molten state, while denitrfying agent use temperature range is wide, temperature model
Enclose up to 650-1100oC。
With reference to the accompanying drawings and examples, the present invention is described in detail.
Embodiment 1
Aluminium cathode roasting uses the hopper roaster of Room 36 8, exhaust gas volumn ~ 100000m3/ h, NOxConcentration 400mg/ Nm3, denitrfying agent
Proportioning compares carbon dust according to quality：Stabilizer：Screening agent：Reducing agent=3:0.2:0.4:1, denitrfying agent dosage is NOxThe 0.5 of quality,
Spray into solid-gas ratio 5 when in roaster:1, sprayed into from flame path hole of roasting furnace by denitrfying agent malleation in roaster, in-furnace temperature 1100
Degree.NOxClearance is up to more than 80%, and fired kiln gas on-line detecting system is shown, system smoke emissioning concentration≤100mg/
Nm3, qualified discharge can be realized.
Embodiment 2
Aluminium cathode roasting uses the hopper roaster of Room 36 8, exhaust gas volumn ~ 100000m3/ h, NOxConcentration 400mg/ Nm3, denitrfying agent
Proportioning compares carbon dust according to quality：Stabilizer：Screening agent：Reducing agent=5:0.1:0.1:1, denitrfying agent dosage is NOxThe 2.5 of quality,
Spray into solid-gas ratio 35 when in roaster:1st, sprayed into from roaster hopper hole by denitrfying agent malleation in roaster, in-furnace temperature 650
Degree.NOxClearance is up to more than 80%, and fired kiln gas on-line detecting system is shown, system smoke emissioning concentration 100mg/Nm3,
Qualified discharge can be realized.
Embodiment 3
Aluminium cathode roasting uses the hopper roaster of Room 54 8, exhaust gas volumn ~ 210000m3/ h, NOxConcentration 400mg/ Nm3, take off
Nitre agent proportioning compares carbon dust according to quality：Stabilizer：Screening agent：Reducing agent=5:0.1:0.1:1, denitrfying agent dosage is NOxQuality
2.5, spray into solid-gas ratio 35 when in roaster:1, sprayed into from flame path hole of roasting furnace by denitrfying agent malleation in roaster, in-furnace temperature
1100 degree.NOxClearance is up to more than 90%, and fired kiln gas on-line detecting system is shown, system smoke emissioning concentration 40mg/
Nm3, qualified discharge can be realized.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure transformation that bright specification and accompanying drawing content are made, or other related technical areas are directly or indirectly used in,
It is included within the scope of the present invention.
Claims (8)
- A kind of 1. aluminium cathode baking furnace fume Dry denitration method, it is characterised in that its denitrification process is calcined in aluminium cathode Stove sprays into solid, powdery reduction denitrfying agent, solid, powdery reduction denitrfying agent thermal decomposition product and the NO in flue gasxGeneration reduction reaction, By NOxIt is reduced into N2, realize denitrating flue gas.
- A kind of 2. aluminium cathode baking furnace fume Dry denitration method according to claim 1, it is characterised in that its solid Powdery reduction denitrfying agent is made up of carbon dust, stabilizer, screening agent, reducing agent, and solid, powdery reduces the particle size range of denitrfying agent 0.01-3mm；Wherein carbon dust, stabilizer, screening agent, the mass ratio of reducing agent are：Carbon dust：Stabilizer：Screening agent：Reducing agent= (3-5):(0.1-0.2):(0.1-0.4):1。
- 3. a kind of aluminium cathode baking furnace fume Dry denitration method according to claim 2, it is characterised in that it is stable Agent is the one or more in sodium acetate, ammonium acetate, ammonium oxalate.
- 4. a kind of aluminium cathode baking furnace fume Dry denitration method according to claim 2, it is characterised in that it is sheltered Agent is citric acid, the one or more of ammonium citrate.
- 5. a kind of aluminium cathode baking furnace fume Dry denitration method according to claim 2, it is characterised in that it is reduced Agent is ammonium acetate, ammonium citrate, urea, ammonium carbonate, ammonium hydrogen carbonate, ammonium carbonate, ammonium sulfite, one kind in ammonium sulfate or several Kind.
- A kind of 6. aluminium cathode baking furnace fume Dry denitration method according to claim 1, it is characterised in that its solid Powdery reduction denitrfying agent dosage is NOx0.5-2.5 times of quality；Spray into solid-gas ratio kg/m when in roaster3For 5:1-35:1.
- 7. a kind of aluminium cathode baking furnace fume Dry denitration method according to claim 1, it is characterised in that denitration is also The temperature range of original reaction is 650 DEG C -1100 DEG C.
- A kind of 8. aluminium cathode baking furnace fume Dry denitration method according to claim 1, it is characterised in that its solid Powdery reduces denitrfying agent and sprayed into from flame path hole of roasting furnace in roaster.
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| CN201710678057.0A CN107349780A (en) | 2017-08-10 | 2017-08-10 | A kind of aluminium cathode baking furnace fume Dry denitration method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108014633A (en) * | 2017-12-05 | 2018-05-11 | 中国铝业股份有限公司 | A kind of Aluminium hydroxide roasting kiln gas Dry denitration method |
| CN108905595A (en) * | 2018-09-20 | 2018-11-30 | 北京英斯派克科技有限公司 | A kind of flue gas in power station boiler Dry denitration method |
| CN108955278A (en) * | 2018-05-14 | 2018-12-07 | 中国铝业股份有限公司 | A kind of Purification Processes for Charcoal Anode of Al Reduction Cell processing method |
| CN109621677A (en) * | 2018-12-29 | 2019-04-16 | 山东九和节能环保科技有限公司 | A kind of composite denitration medicament and preparation method thereof |
| CN109925856A (en) * | 2019-03-29 | 2019-06-25 | 中国铝业股份有限公司 | A kind of homogeneous selective non-catalytic reduction method of denitration of dry method |
| CN110449123A (en) * | 2019-07-24 | 2019-11-15 | 西安建筑科技大学 | A kind of sintering flue gas desulfurization denitration material and preparation method thereof |
| CN111282416A (en) * | 2020-01-23 | 2020-06-16 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Electrolytic aluminum carbon anode roasting flue gas purification equipment and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102512952A (en) * | 2011-11-14 | 2012-06-27 | 浙江天蓝环保技术股份有限公司 | Fluidized bed-based flue gas combined desulfurization and denitration process |
| CN104383808A (en) * | 2014-12-03 | 2015-03-04 | 天津天和环能科技有限公司 | Process and device for carrying out flue gas denitrification by utilizing solid organic denitrifying agent |
-
2017
- 2017-08-10 CN CN201710678057.0A patent/CN107349780A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102512952A (en) * | 2011-11-14 | 2012-06-27 | 浙江天蓝环保技术股份有限公司 | Fluidized bed-based flue gas combined desulfurization and denitration process |
| CN104383808A (en) * | 2014-12-03 | 2015-03-04 | 天津天和环能科技有限公司 | Process and device for carrying out flue gas denitrification by utilizing solid organic denitrifying agent |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108014633A (en) * | 2017-12-05 | 2018-05-11 | 中国铝业股份有限公司 | A kind of Aluminium hydroxide roasting kiln gas Dry denitration method |
| CN108955278A (en) * | 2018-05-14 | 2018-12-07 | 中国铝业股份有限公司 | A kind of Purification Processes for Charcoal Anode of Al Reduction Cell processing method |
| CN108905595A (en) * | 2018-09-20 | 2018-11-30 | 北京英斯派克科技有限公司 | A kind of flue gas in power station boiler Dry denitration method |
| CN109621677A (en) * | 2018-12-29 | 2019-04-16 | 山东九和节能环保科技有限公司 | A kind of composite denitration medicament and preparation method thereof |
| CN109925856A (en) * | 2019-03-29 | 2019-06-25 | 中国铝业股份有限公司 | A kind of homogeneous selective non-catalytic reduction method of denitration of dry method |
| CN110449123A (en) * | 2019-07-24 | 2019-11-15 | 西安建筑科技大学 | A kind of sintering flue gas desulfurization denitration material and preparation method thereof |
| CN110449123B (en) * | 2019-07-24 | 2022-04-26 | 西安建筑科技大学 | Sintering flue gas desulfurization and denitrification material and preparation method thereof |
| CN111282416A (en) * | 2020-01-23 | 2020-06-16 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Electrolytic aluminum carbon anode roasting flue gas purification equipment and method |
| CN111282416B (en) * | 2020-01-23 | 2022-08-16 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Electrolytic aluminum carbon anode roasting flue gas purification equipment and method |
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