CN104971592A - Method for removing nitrogen oxides of coal-fired flue gas - Google Patents
Method for removing nitrogen oxides of coal-fired flue gas Download PDFInfo
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- CN104971592A CN104971592A CN201510352221.XA CN201510352221A CN104971592A CN 104971592 A CN104971592 A CN 104971592A CN 201510352221 A CN201510352221 A CN 201510352221A CN 104971592 A CN104971592 A CN 104971592A
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- coal
- catalyst
- fired flue
- flue gas
- gas
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Abstract
The invention discloses a method for removing nitrogen oxides of coal-fired flue gas. The coal-fired flue gas and ammonia gas react at a temperature of 200-300 DEG C in a fixed bed reactor; the fixed bed reactor adopts a V2O5/TiO2 catalyst; and auxiliaries comprising zinc oxide and magnesium oxide, amount of which is 1.5-2 times the weight of the catalyst, are added. Compared with current V2O5/TiO2 catalytic selective denitration, the method disclosed by the invention can obviously improve the current V2O5/TiO2 catalytic effect and can improve nitrogen removal efficiency, is good in adaption, and has a nitrogen (NOx) removal rate higher than 95%.
Description
Technical field
The present invention relates to a kind of method removing coal-fired flue-gas oxynitrides.
Background technology
Coal-fired flue-gas is the mixture of gas and flue dust, is the main cause polluting residential block air.The composition of flue gas is very complicated, and gas comprises SO
2, NO
2, NO, CO, CO
2deng pernicious gas, and ash content, coal grain, oil droplet and high-temperature split product etc.Therefore the pollution of flue gas to environment is the combined pollution of multiple poisonous substance.Be that oxynitrides in reducing agent selective catalytic reduction flue gas is now widely used with ammonia, the catalyst used is mainly V
2o
5/ TiO
2, denitration rate generally can only reach 80-90%.
Summary of the invention
The technical problem to be solved in the present invention overcomes existing defect, provides a kind of method removing coal-fired flue-gas oxynitrides.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
Remove a method for coal-fired flue-gas oxynitrides, coal-fired flue-gas and ammonia are reacted the oxynitrides removed in flue gas in fixed bed reactors at 200 ~ 300 DEG C, fixed bed reactors adopt V
2o
5/ TiO
2catalyst, is characterized in that, doubly add by the 1.5-2 of catalyst weight and help agent, described co-catalyst is made up of zinc oxide and magnesia.
Described zinc oxide and magnesian mass ratio are (3-6): 1.
With existing V
2o
5/ TiO
2catalytic selectivity denitration is compared, and adopts the inventive method can significantly improve existing V
2o
5/ TiO
2catalytic effect, improve nitric efficiency, adaptability is good, nitrogen (NO
x) extrusion rate can reach more than 95%.
Detailed description of the invention
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
embodiment 1
After coal-fired flue-gas wet dedusting, flue gas is mixed with ammonia and at 200 ~ 300 DEG C, reacts towards fixed bed the oxynitrides removed in flue gas.Catalyst in fixed bed reactors adopts commercially available V
2o
5/ TiO
2catalyst (V
2o
5: 2wt%), be 1:2 by catalyst and co-catalyst mass ratio, adding by mass ratio is the mixed cocatalyst that the zinc oxide of 3:1 and magnesia form.
embodiment 2
Differently from embodiment 1 be, the mass ratio of catalyst and co-catalyst is 1:1.5, and co-catalyst is that the zinc oxide of 6:1 and magnesia form by mass ratio.
The reaction occurred has: NH
3+ NO+O
2→ N
2+ H
2o, NH
3+ NO
2+ O
2→ N
2+ H
2o, NH
3+ NO
2→ N
2+ H
2o.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. remove a method for coal-fired flue-gas oxynitrides, coal-fired flue-gas and ammonia are reacted at 200 ~ 300 DEG C in fixed bed reactors, fixed bed reactors adopt V
2o
5/ TiO
2catalyst, is characterized in that, doubly add by the 1.5-2 of catalyst weight and help agent, described co-catalyst is made up of zinc oxide and magnesia.
2. method according to claim 1, is characterized in that, described zinc oxide and magnesian mass ratio are (3-6): 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510352221.XA CN104971592A (en) | 2015-06-24 | 2015-06-24 | Method for removing nitrogen oxides of coal-fired flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510352221.XA CN104971592A (en) | 2015-06-24 | 2015-06-24 | Method for removing nitrogen oxides of coal-fired flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104971592A true CN104971592A (en) | 2015-10-14 |
Family
ID=54268891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510352221.XA Pending CN104971592A (en) | 2015-06-24 | 2015-06-24 | Method for removing nitrogen oxides of coal-fired flue gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104971592A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631921A (en) * | 2012-03-23 | 2012-08-15 | 华烁科技股份有限公司 | Nitric acid exhaust gas denitration catalyst and preparation method thereof |
| CN103894182A (en) * | 2014-04-01 | 2014-07-02 | 李灏呈 | Flue gas denitrification catalyst with wide activity temperature interval as well as preparation method thereof |
-
2015
- 2015-06-24 CN CN201510352221.XA patent/CN104971592A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631921A (en) * | 2012-03-23 | 2012-08-15 | 华烁科技股份有限公司 | Nitric acid exhaust gas denitration catalyst and preparation method thereof |
| CN103894182A (en) * | 2014-04-01 | 2014-07-02 | 李灏呈 | Flue gas denitrification catalyst with wide activity temperature interval as well as preparation method thereof |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151014 |
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| RJ01 | Rejection of invention patent application after publication |