CN109499301A - A kind of method that rice hull ash cooperates with progress dry-process cement rotary kiln dore furnace denitrating flue gas with coal dust - Google Patents
A kind of method that rice hull ash cooperates with progress dry-process cement rotary kiln dore furnace denitrating flue gas with coal dust Download PDFInfo
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- CN109499301A CN109499301A CN201811439995.6A CN201811439995A CN109499301A CN 109499301 A CN109499301 A CN 109499301A CN 201811439995 A CN201811439995 A CN 201811439995A CN 109499301 A CN109499301 A CN 109499301A
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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
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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
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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
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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 method that rice hull ash cooperates with progress dry-process cement rotary kiln dore furnace denitrating flue gas with coal dust, belongs to industrial furnace smoke Pollutant Control Technology field.The present invention is reacted using sodium hydroxide solution and rice hull ash, obtains the rice hull ash of alkali modification.The rice hull ash of this alkali modification is uniformly mixed with coal dust according to mass ratio 1:1~3:1, rice hull ash/coal dust mixture is sufficiently mixed with 5~10% mass ratio with 90~95% cement slurry.Finally at 750~900 DEG C, oxygen concentration of volume percent is 1~5%, N2Under conditions of Balance Air, ammonia reducing agent is not needed, utilize the nitrogen oxides in the carbon collaborative SCM flue gas in rice hull ash and coal dust, wherein the oxide ash in rice hull ash is identical as the ingredient of cement, it will not influence the performance of cement, while there is rice hull ash certain calorific value can be used as the use that a kind of biomass fuel appropriately replaces coal dust.Present invention process is simple, low in cost, and denitrification rate is up to 75% or more.
Description
Technical field
The invention belongs to industrial furnace smoke Pollutant Control Technology fields, and in particular to a kind of rice hull ash is cooperateed with coal dust
The method for carrying out dry-process cement rotary kiln dore furnace denitrating flue gas
Background technique
As China constantly aggravates the attention of environmental issue, the Air Pollutant Emission problem got worse is by more
Field concern, wherein nitrogen oxides (NOx) not only causes sternly the ecosystem as most dangerous one of atmosphere pollution
It endangers again, has even more seriously threatened the health of mankind itself.Manufacture of cement industry as another big coal-fired industry field,
Its NOx content discharged should not be underestimated.According to regulation in " cement industry atmosphere pollutants emission standards " (GB 4915-2013):
The NOx emission of general area and key area is limited to 400mg/m respectively3, 320mg/m3, therefore continue for cement production enterprise
Development, there is an urgent need to find cost-effective control method for cement industry NOx emission.Present SCR technology
(SCR) and selective non-catalytic reduction technology (SNCR) is still adaptable to two big main method of denitration of cement kiln, still
Both technologies require to use ammonia substance as reducing agent, inevitably need to add additional storage ammonia and spray ammonia dress
It sets, and secondary pollution problem can be brought because of the escape of ammonia.Wherein the denitration efficiency of SNCR is low, and the requirement to reducing agent injection is very
Height, although out of stock efficiency is higher by SCR, but it needs to use catalyst, and the service life of general catalyst is not long to increase
Its economic cost.Studies have shown that under the conditions of 700 DEG C or more of temperature, some carbonaceous material (coal dust, the raws material of wood-charcoal of biomass sources
Material) it can use itself C reduction NOx, it is contemplated that and first is that the temperature range of cement decomposing furnace is generally at 750~900 DEG C, this is suitable
For the temperature of C reduction NOx, second is that rice hull ash as the Main By product after combusting rice hull, is not only the master agriculturally generated
Rubbish is wanted, and is rich in a large amount of carbon, specific surface area is high, cheap, substantial amounts.For this purpose, rice hull ash and coal dust utilize
Carbon therein carries out the removing of cement kiln dore furnace NOx with collaboration, can not only realize recycling for waste resource, even more can
It is enough greatly to save denitration cost, promote the sustainable development of cement production enterprise, while starting point of the invention lies also in this.
Summary of the invention
It is an object of the invention to propose that a kind of rice hull ash is cooperateed with coal dust to carry out dry-process cement rotary kiln dore furnace denitrating flue gas
Method, can effectively remove NOx.Present invention process is simple, can be with effectively save resource and cost, and can be to avoid because of ammonia
Class reducing agent use and caused by secondary pollution problem.
The specific technical solution that the present invention uses is as follows:
A kind of method that rice hull ash cooperates with progress dry-process cement rotary kiln dore furnace denitrating flue gas with coal dust, which is characterized in that packet
Include following steps:
(1) a certain amount of deionized water is measured, the NaOH solution of 1~3mol/L of concentration is configured to；Weigh certain mass
Rice hull ash, so that rice hull ash quality and NaOH solution volume ratio are 1:10~1:15g/ml；
(2) NaOH solution is tentatively uniformly mixed with rice hull ash, 70~100 DEG C at a temperature of, keep 300r/min~
3~6h of magnetic agitation of 500r/min；
(3) suspension is subjected to suction filtration dehydration, by the rice hull ash after alkali modification in 90~110 DEG C of 6~12h of drying, grinding
Closed preservation afterwards；
(4) rice hull ash of alkali modification is uniformly mixed with coal dust according to mass ratio 1:1~3:1, the mixing of rice hull ash/coal dust
Object is sufficiently mixed with 5~10% mass ratio with 90~95% cement slurry, also using the carbon collaboration in rice hull ash and coal dust
NOx in former flue gas.
It further, is 1~5%, N in oxygen concentration of volume percent2For Balance Air, temperature is 750~900 DEG C, gas
The removing of NOx is carried out when flow velocity is 450ml/min.
Wherein the oxide ash in rice hull ash is identical as the ingredient of cement, will not influence the performance of cement, while rice husk
There is ash certain calorific value can be used as the use that a kind of biomass fuel appropriately replaces coal dust.
Effect of the invention is:
(1) recycling of waste resource is realized using rice husk putty material, and low in cost.Utilizing rice hull ash and coal dust
In carbon collaborative SCM cement kiln decompose kiln in NOx when, without the use of ammonia reducing agent, without increasing extra device,
Also without being transformed to existing cement kiln, easy to operate, cost is relatively low and avoids secondary pollution caused by NH_3 leakage.
(2) rice hull ash of alkali modification is uniformly mixed with coal dust according to mass ratio 1:1~3:1, the mixing of rice hull ash/coal dust
Object is sufficiently mixed with 5~10% mass ratio with 90~95% cement slurry, is 1~5% in oxygen concentration of volume percent,
N2For Balance Air, temperature is 750~900 DEG C, and gas flow rate reaches 75% or more denitrification rate under conditions of being 450ml/min.
(3) the modified rice hull ash oxide ash content of NaOH aqueous slkali has dropped about 80%, and specific surface area increases
About 200m2/ g, carbon content increase about 40%, and which not only improves the touch opportunities of rice hull ash and NOx, and improve rice husk
Usage amount of the ash as biomass energy replacing fuel coal dust.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but the present invention is not limited to following embodiments.
Embodiment 1
The deionized water for measuring 200ml is configured to the NaOH solution of concentration 1.5mol/L, in configured NaOH solution
The rice hull ash that 20g is added keeps the speed magnetic agitation 6h of 500r/min, suspension is filtered under 70 DEG C of constant temperature
Be dehydrated and in 110 DEG C of dry 6h, dry powder is ground.
The rice hull ash of alkali modification processing is uniformly mixed with coal dust according to mass ratio 1:1, then by the mixing of rice hull ash/coal dust
Object after mixing evenly, is added in the tube furnace that diameter is 3cm, in flue gas with 9.1% mass ratio and 90.9% cement slurry
Condition is 1000ppmNO, 1%O2, N2For Balance Air, gas flow rate 450ml/min, when temperature condition is 900 DEG C, Ke Yida
To 96.67% denitrification rate.
Embodiment 2
The deionized water for measuring 100ml is configured to the NaOH solution of concentration 3mol/L, adds in configured NaOH solution
Enter 10g rice hull ash, under 90 DEG C of constant temperature, keep the speed magnetic agitation 4h of 400r/min, suspension is filtered and is dehydrated
And in 110 DEG C of dry 6h, dry powder is ground.
The rice hull ash of alkali modification processing is uniformly mixed with coal dust according to mass ratio 1:1, then by the mixing of rice hull ash/coal dust
Object after mixing evenly, is added in the tube furnace that diameter is 3cm, in flue gas with 9.1% mass ratio and 90.9% cement slurry
Condition is 1000ppmNO, 3%O2, N2For Balance Air, gas flow rate 450ml/min, when temperature condition is 900 DEG C, Ke Yida
To 91.38% denitrification rate.
Embodiment 3
The deionized water for measuring 300ml is configured to the NaOH solution of concentration 1mol/L, adds in configured NaOH solution
The rice hull ash for entering 20g keeps the speed magnetic agitation 3h of 300r/min under 100 DEG C of constant temperature, suspension is filtered de-
Water and in 110 DEG C of dry 6h, dry powder is ground.
The rice hull ash of alkali modification processing is uniformly mixed with coal dust according to mass ratio 1:1, then by the mixing of rice hull ash/coal dust
Object after mixing evenly, is added in the tube furnace that diameter is 3cm, in flue gas with 9.1% mass ratio and 90.9% cement slurry
Condition is 1000ppmNO, 5%O2, N2For Balance Air, gas flow rate 450ml/min, when temperature condition is 900 DEG C, Ke Yida
To 84.62% denitrification rate.
Embodiment 4
The preparation of the rice hull ash of NaOH aqueous slkali modification is as described in case study on implementation 3, by the rice hull ash of alkali modification processing
It is uniformly mixed with coal dust according to mass ratio 3:1, then by rice hull ash/coal dust mixture with 9.1% mass ratio and 90.9% water
Mud raw material after mixing evenly, are added in the tube furnace that diameter is 3cm, are 1000ppmNO, 5%O in flue gas condition2, N2It is flat
Weigh gas, and gas flow rate 450ml/min can achieve 89.86% denitrification rate when temperature condition is 900 DEG C.
Embodiment 5
The preparation of the rice hull ash of NaOH aqueous slkali modification is as described in case study on implementation 3, by the rice hull ash of alkali modification processing
It is uniformly mixed with coal dust according to mass ratio 1:3, then by rice hull ash/coal dust mixture with 9.1% mass ratio and 90.9% water
Mud raw material after mixing evenly, are added in the tube furnace that diameter is 3cm, are 1000ppmNO, 5%O in flue gas condition2, N2It is flat
Weigh gas, and gas flow rate 450ml/min can achieve 78.01% denitrification rate when temperature condition is 900 DEG C.
Embodiment 6
The preparation of the rice hull ash of NaOH aqueous slkali modification is as described in case study on implementation 2, by the rice hull ash of alkali modification processing
It is uniformly mixed with coal dust according to mass ratio 1:1, then by rice hull ash/coal dust mixture with 9.1% mass ratio and 90.9% water
Mud raw material after mixing evenly, are added in the tube furnace that diameter is 3cm, are 1000ppmNO, 5%O in flue gas condition2, N2It is flat
Weigh gas, and gas flow rate 450ml/min can achieve 82.07% denitrification rate when temperature condition is 850 DEG C.
Embodiment 7
The preparation of the rice hull ash of NaOH aqueous slkali modification is as described in case study on implementation 2, by the rice hull ash of alkali modification processing
It is uniformly mixed with coal dust according to mass ratio 1:1, then by rice hull ash/coal dust mixture with 9.1% mass ratio and 90.9% water
Mud raw material after mixing evenly, are added in the tube furnace that diameter is 3cm, are 1000ppmNO, 5%O in flue gas condition2, N2It is flat
Weigh gas, and gas flow rate 450ml/min can achieve 80.02% denitrification rate when temperature condition is 800 DEG C.
Embodiment 8
The preparation of the rice hull ash of NaOH aqueous slkali modification is as described in case study on implementation 2, by the rice hull ash of alkali modification processing
It is uniformly mixed with coal dust according to mass ratio 1:1, then by rice hull ash/coal dust mixture with 9.1% mass ratio and 90.9% water
Mud raw material after mixing evenly, are added in the tube furnace that diameter is 3cm, are 1000ppmNO, 5%O in flue gas condition2, N2It is flat
Weigh gas, and gas flow rate 450ml/min can achieve 78.80% denitrification rate when temperature condition is 750 DEG C.
Embodiment 9
The preparation of the rice hull ash of NaOH aqueous slkali modification is as described in case study on implementation 1, by the rice hull ash of alkali modification processing
It is uniformly mixed with coal dust according to mass ratio 3:1, then by rice hull ash/coal dust mixture with 9.1% mass ratio and 90.9% water
Mud raw material after mixing evenly, are added in the tube furnace that diameter is 3cm, are 1000ppmNO, 5%O in flue gas condition2, N2It is flat
Weigh gas, and gas flow rate 450ml/min can achieve 83.22% denitrification rate when temperature condition is 750 DEG C.
Embodiment 10
The preparation of the rice hull ash of NaOH aqueous slkali modification is as described in case study on implementation 1, by the rice hull ash of alkali modification processing
It is uniformly mixed with coal dust according to mass ratio 1:1, then rice hull ash/coal dust mixture is raw with 7% mass ratio and 93% cement
Material after mixing evenly, is added in the tube furnace that diameter is 3cm, is 1000ppmNO, 5%O in flue gas condition2, N2For Balance Air,
Gas flow rate is that 450ml/min can achieve 81.18% denitrification rate when temperature condition is 900 DEG C.
The denitrification rate of each embodiment of table 1
Claims (2)
1. a kind of rice hull ash cooperates with the method for carrying out dry-process cement rotary kiln dore furnace denitrating flue gas with coal dust, which is characterized in that including
Following steps:
(1) rice hull ash of certain mass is weighed, and measures a certain amount of deionized water, is configured to the NaOH of 1~3mol/L of concentration
Solution；Rice hull ash quality and NaOH solution volume ratio are 1:10~1:15g/ml；
(2) NaOH solution is uniformly mixed with rice hull ash, at 70~100 DEG C, the magnetic force of 300r/min~500r/min is kept to stir
It mixes 3~6h and obtains the rice hull ash after alkali modification；
(3) suspension is subjected to suction filtration dehydration, it is close after grinding by the rice hull ash after alkali modification in 90~110 DEG C of drying 6~12h
Close preservation；
(4) rice hull ash of alkali modification after drying is uniformly mixed with coal dust according to mass ratio 1:1~3:1, rice hull ash/coal dust is mixed
It closes object to be sufficiently mixed with 5~10% mass ratio with 90~95% cement slurry, utilizes the carbon collaboration in rice hull ash and coal dust
Restore the NOx in flue gas.
2. a kind of rice hull ash cooperates with progress dry-process cement rotary kiln dore furnace denitrating flue gas with coal dust as described in claim 1 for application
Method, which is characterized in that oxygen concentration of volume percent be 1~5%, N2For Balance Air, temperature is 750~900 DEG C, gas
Flow velocity reaches 75% or more denitrification rate under conditions of being 450ml/min.
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| CN201811439995.6A CN109499301A (en) | 2018-11-29 | 2018-11-29 | A kind of method that rice hull ash cooperates with progress dry-process cement rotary kiln dore furnace denitrating flue gas with coal dust |
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Cited By (4)
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| CN110465179A (en) * | 2019-07-16 | 2019-11-19 | 北京工业大学 | A method of denitrating flue gas is carried out using pyrolysis pickling sludge |
| CN110917833A (en) * | 2019-12-13 | 2020-03-27 | 西安润川环保科技有限公司 | Novel flue gas denitration method |
| CN111909747A (en) * | 2019-05-10 | 2020-11-10 | 吉林金隅冀东环保科技有限公司 | Process for replacing raw coal fuel with biomass |
| CN112742205A (en) * | 2019-10-31 | 2021-05-04 | 广东万引科技发展有限公司 | Novel biomass denitration agent for dry-process cement kiln, use method of novel biomass denitration agent and denitration system |
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| CN106268279A (en) * | 2016-08-29 | 2017-01-04 | 北京工业大学 | A kind of method of denitration of dry-process cement rotary kiln flue gas |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111909747A (en) * | 2019-05-10 | 2020-11-10 | 吉林金隅冀东环保科技有限公司 | Process for replacing raw coal fuel with biomass |
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| CN112742205A (en) * | 2019-10-31 | 2021-05-04 | 广东万引科技发展有限公司 | Novel biomass denitration agent for dry-process cement kiln, use method of novel biomass denitration agent and denitration system |
| CN112742205B (en) * | 2019-10-31 | 2024-01-23 | 广东万引科技发展有限公司 | Novel biomass denitration agent for dry-method cement kiln, application method of novel biomass denitration agent and denitration system |
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