CN101767041A - Preparation method of flue gas denitration catalyst - Google Patents
Preparation method of flue gas denitration catalyst Download PDFInfo
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- CN101767041A CN101767041A CN200910074819A CN200910074819A CN101767041A CN 101767041 A CN101767041 A CN 101767041A CN 200910074819 A CN200910074819 A CN 200910074819A CN 200910074819 A CN200910074819 A CN 200910074819A CN 101767041 A CN101767041 A CN 101767041A
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- activated coke
- coke
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- flue gas
- denitration catalyst
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Abstract
The invention discloses a preparation method of flue gas denitration catalyst, which solves the problem of expensive denitration catalyst and low denitration efficiency in the prior art. The adopted technical scheme is as follows: the method comprises the processing process and method of lignite char, which comprise the following steps and sequence: preparing the lignite char through using lignite as raw material, according to weight percentage of 47-75% :10-35%:5-24%, mixing, forming, drying the lignite char, the lignite, and the coal tar to prepare active coke, adding the enhancer to the active coke for further activation, in order to prepare the optimized active coke. The invention uses the lignite as main raw material, uses the inorganic salt or metal oxide as the enhancer; the advantages of the invention are as follows: the manufacturing cost is low, and the product catalytic effect is good.
Description
Technical field
The present invention relates to the preparation method of activated coke in a kind of Industrial Stoves gas denitrifying technology, particularly a kind of preparation method to flue gas applied denitration catalyst in purification process of producing in thermal power plant and the steel sintering process.
Background technology
Coal is the most important energy of China, has determined that China's atmosphere pollution is coal-smoke pollution, and major pollutants are dust, SO
2, NO
XAccording to statistics, China's air pollution emission 70% from coal combustion, wherein coal fire discharged fume amount, SO
2, NO
XAccount for 60%, 87% and 67% of China's total release respectively.SO in the flue gas
2Be one of key factor that causes environmental pollution, nitrogen oxide NO
XDetrimental effect to environment is very big, can be converted into nitrous acid and nitric acid in atmosphere, also can continue to generate nitrite and nitrate, is one of main matter that forms acid rain.
Thermal power plant, steel plant are consumption of coal rich anies influential family, are coal-fired SO
2, NO
XMain heavy polluter.Thermal power plant, steel plant's coal-fired flue-gas take off SO
2, NO
X, be the urgent task in China Air Pollution Control field.
It has been the recognized techniques scheme that activated coke can be used for flue gas desulfurization.Activated coke can be divided three classes according to producing the raw material difference: the first kind, and shell class such as coconut husk activated coke, its desulfurization performance is good.But owing to reasons such as resource are few, it costs an arm and a leg; Second class, the ature of coal activated coke is the activated coke of main material production with the coal, its desulphurizing ability is poor; The 3rd class is soaked KI ature of coal activated coke, and in use, iodine can volatilize gradually, thereby influences purification efficiency.
In the gas denitrifying technology, selective catalytic reduction SCR technology and SNCR SNCR technology etc.According to the catalytic reaction temperature of use catalyst, SCR technology is divided into high temperature, middle gentle low temperature, and general high temperature is greater than 400 degree, middle temperature 300-400 degree.SCR become at present in the world use at most, the most ripe and the most effective a kind of gas denitrifying technology, at present in developed country's extensive uses such as Japan, Germany, the U.S., also begin application in the newly-built power plant of China.Most widely used maximum SCR catalyst is a titania-based catalyst in the engineering at present.Crucial obstacle still is a catalyst cost height, and the life-span is short, requires flue-gas temperature 300-400 degree, equipment operating cost height.
Develop a kind of cheap, low temperature environment and can realize that down the SCR technology of catalytic action is the important topic in the depollution of environment field that faces at present.
Summary of the invention
The present invention prepares a kind of cheap, high to denitrating flue gas efficient denitration catalyst in order to solve the problem that prior art exists.
The technical scheme that adopts is: a kind of preparation method of flue gas denitration catalyst, comprise the processing technology and the method for lignite semi-coke, further comprising the steps of:
1) utilize brown coal to be the feedstock production lignite semi-coke,
2) with lignite semi-coke, coking coal and coal tar by weight percentage 47-75%: 10-35%: 5-24% mix, moulding, drying, make activated coke,
3) add activator the further activation processing of activated coke is made the optimization activated coke.
The present invention with brown coal as the primary raw material of making activated coke, aboundresources, cheap.In retort process fugitive constituent separate out the effect of having played pore-creating, form bigger specific area; The oxygen content height of brown coal helps its desulphurization denitration ability of raising; The degree of coalification of brown coal is low, its chemical reactivity height, and with the activated coke mesopore prosperity that brown coal make, the micropore ratio is little, is fit to do the reinforcement agent carrier.
The invention has the beneficial effects as follows: adopting inorganic salts or oxide is that activated coke is optimized in the activator preparation, and cost is low, and the optimization activated coke of made has the intensity height, and specific area is big, denitration effect good, efficient is high.
Description of drawings
Fig. 1 is the flow chart of one embodiment of the invention.
Fig. 2 is the flow chart of another embodiment of the present invention.
The specific embodiment
The present invention is low for the efficient of the denitrating catalyst that solves prior art, cost an arm and a leg, the problem that reaction temperature is high, having made a kind of is primary raw material with brown coal, remove the high catalyst of nitre efficient, the technical scheme that adopts is: a kind of preparation method of flue gas denitration catalyst comprises may further comprise the steps the processing technology and the method for lignite semi-coke and order:
1) utilize brown coal to be the feedstock production lignite semi-coke,
2) with lignite semi-coke, coking coal and coal tar by weight percentage 47-75%: 10-35%: 5-24% mix, moulding, drying, make activated coke,
3) add activator the further activation processing of activated coke is made the optimization activated coke.
In the technical scheme of embodiments of the invention, described activator is inorganic salts activator, for example Fe
2(SO
4)
3, or FeSO
4, or CuSO
4, concrete processing procedure is; At first carry out 800-1100 ℃ and feed steam activation down, adopt above any one inorganic salts to make saturated solution again, activated coke is flooded, the dip time of activated coke is 100-140 minute, and taking-up is dried standby.
In the technical scheme of embodiments of the invention, the activator that is adopted is metal oxide Cr
2O
3, add Cr according to the 5-15% of activated coke weight
2O
3, mix after, directly generate to optimize activated coke.
In the technical scheme of embodiments of the invention, the activator that is adopted is metal oxide CuO, after adding CuO, mix according to the 5-15% of activated coke weight, directly generates the optimization activated coke.
In the technical scheme of the embodiment that the present invention is above, the optimization activated coke that directly generates is further carried out drying, again with dried particle under 800-1000 ℃ of condition, by the steam activation that feeds, make the optimization activated coke.
In the technical solution of the present invention, be that to choose particle mean size be 2 millimeters brown coal particle in step 1), wherein the further processing to the brown coal particle is to adopt nitrogen as the carbonizing gas medium, and the control temperature is between 500-700 ℃, and lignite semi-coke is produced in destructive distillation.
Below by specific embodiment, to abovementioned steps 2 of the present invention) in the proportioning of activated coke be described further:
The present invention is described further below in conjunction with accompanying drawing.
Choose particle mean size and be 2 millimeters brown coal particle, adopt nitrogen as the carbonizing gas medium, the control temperature is between 500-700 ℃, and lignite semi-coke is produced in destructive distillation.With lignite semi-coke, coking coal and coal tar 47-75%: 10-35% by weight percentage: 5-24% mixes, and makes activated coke.
Referring to Fig. 1, after lignite semi-coke, coking coal and coal tar mixed by mass percentage, carry out 800-1100 ℃ and feed steam activation down, the space on activated coke surface is increased, improve adsorption capacity, re-use inorganic salts activation thinner agent as Fe
2(SO4)
3, or FeSO
4, or CuSO
4Prepare the optimization activated coke.Use contains the saturated solution of activator, and activated coke is further activated, and makes the optimization activated coke.The volume of maceration extract adopts excessive infusion process to be advisable, and dip time is controlled at 100-140min.After this process was finished, taking-up was dried, and promptly finished making.
Referring to Fig. 2, use metal oxide to be catalyst such as Cr
2O
3, or CuO prepare the optimization activated coke.Lignite semi-coke, coking coal and coal tar by after the certain quality percentage mix, are added Cr
2O
3, during CuO, add Cr according to the 5-15% of activated coke weight
2O
3, or after CuO mixes, moulding, drying, and under 800-1000 ℃ of condition, by the steam activation that feeds, increase the space of optimizing the activated coke surface make that to optimize activated coke standby.
It is raw material that the present invention adopts brown coal, greatly reduces cost of manufacture, and the lignite resource of China is abundant, and obtaining of raw material is convenient relatively.Also has coking coal, coal tar in addition.The adding of coking coal is in order to improve the mechanical strength of activated coke.Coal tar adds as binding agent, helps to improve the mechanical strength of activated coke equally.
It is that activated coke is optimized in the hardening agent preparation that the present invention adopts inorganic salts or metal oxide, and cost is low, and the optimization activated coke of made has the intensity height, the big and good advantage of denitration effect of specific area.
The present invention adopts the steam high-temperature activation, has increased internal surface area and its surface-active bit value of optimizing activated coke, has improved the denitration ability.
The present invention in use, flue-gas temperature can be brought into play good catalytic action at 70-150 ℃.
Claims (6)
1. the preparation method of a flue gas denitration catalyst comprises it is characterized in that the processing technology and the method for lignite semi-coke: further comprising the steps of:
1) utilize brown coal to be the feedstock production lignite semi-coke,
2) with lignite semi-coke, coking coal and coal tar by weight percentage 47-75%: 10-35%: 5-24% mix, moulding, drying, make activated coke,
3) add activator the further activation processing of activated coke is made the optimization activated coke.
2. the preparation method of a kind of flue gas denitration catalyst according to claim 1, it is characterized in that: described activator is inorganic salts activator, for example Fe
2(SO
4)
3, or FeSO
4, or CuSO
4, concrete processing procedure is; At first carry out 800-1100 ℃ and feed steam activation down, adopt above any one inorganic salts to make saturated solution again, activated coke is flooded, the dip time of activated coke is 100-140 minute, and taking-up is dried standby.
3. the preparation method of a kind of flue gas denitration catalyst according to claim 1, it is characterized in that: the activator that is adopted is metal oxide Cr
2O
3, add Cr according to the 5-15% of activated coke weight
2O
3, mix after, directly generate to optimize activated coke.
4. the preparation method of a kind of flue gas denitration catalyst according to claim 1, it is characterized in that: it is characterized in that: the activator that is adopted is metal oxide CuO, 5-15% according to activated coke weight adds CuO, mixes moulding, directly generates to optimize activated coke.
5. according to the preparation method of claim 3 or 4 described a kind of flue gas denitration catalysts, it is characterized in that: the optimization activated coke that will directly generate is further carried out drying, again with dried particle under 800-1000 ℃ of condition, by the steam activation that feeds, make the optimization activated coke.
6. the preparation method of a kind of flue gas denitration catalyst according to claim 1, it is characterized in that: be that to choose particle mean size be 2 millimeters brown coal particle in step 1), wherein the further processing to the brown coal particle is to adopt nitrogen as the carbonizing gas medium, the control temperature is between 500-700 ℃, and lignite semi-coke is produced in destructive distillation.
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| CN200910074819A CN101767041A (en) | 2009-07-06 | 2009-07-06 | Preparation method of flue gas denitration catalyst |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106311245A (en) * | 2015-06-24 | 2017-01-11 | 云南民族大学 | Preparation method for lignite semi-coke-based denitration agent used for low-temperature catalytic oxidation |
| CN107335327A (en) * | 2017-06-30 | 2017-11-10 | 合肥天翔环境工程有限公司 | A kind of flue gas desulfurization denitration dust-removing integrated system |
| CN107539986A (en) * | 2016-06-27 | 2018-01-05 | 中国石油化工股份有限公司 | A kind of activated coke and preparation method thereof |
| CN108434870A (en) * | 2018-03-27 | 2018-08-24 | 江苏天雅环保科技有限公司 | Filer element type carrier and preparation method thereof, loaded catalyst and preparation method thereof |
-
2009
- 2009-07-06 CN CN200910074819A patent/CN101767041A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106311245A (en) * | 2015-06-24 | 2017-01-11 | 云南民族大学 | Preparation method for lignite semi-coke-based denitration agent used for low-temperature catalytic oxidation |
| CN107539986A (en) * | 2016-06-27 | 2018-01-05 | 中国石油化工股份有限公司 | A kind of activated coke and preparation method thereof |
| CN107335327A (en) * | 2017-06-30 | 2017-11-10 | 合肥天翔环境工程有限公司 | A kind of flue gas desulfurization denitration dust-removing integrated system |
| CN108434870A (en) * | 2018-03-27 | 2018-08-24 | 江苏天雅环保科技有限公司 | Filer element type carrier and preparation method thereof, loaded catalyst and preparation method thereof |
| CN108434870B (en) * | 2018-03-27 | 2020-12-01 | 江苏天雅环保科技有限公司 | Filter element type carrier and preparation method thereof, and supported catalyst and preparation method thereof |
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Open date: 20100707 |