CN100417430C - Process for catalytic reduction treatment of waste-air contg. nitrogen oxiden - Google Patents
Process for catalytic reduction treatment of waste-air contg. nitrogen oxiden Download PDFInfo
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- CN100417430C CN100417430C CNB2005100281792A CN200510028179A CN100417430C CN 100417430 C CN100417430 C CN 100417430C CN B2005100281792 A CNB2005100281792 A CN B2005100281792A CN 200510028179 A CN200510028179 A CN 200510028179A CN 100417430 C CN100417430 C CN 100417430C
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- gas
- catalytic reduction
- nox contained
- waste gas
- contained waste
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Abstract
A catalytic reduction process for treating the waste gas containing NOx includes such steps as mixing said waste gas with fuel gas, adding the mixture along with the catalyst which is the cellular ceramic or metal made of Pt, Pd, or Ph into a catalytic reactor, and catalytic reduction reaction to reduce NOx into N2 and H2O.
Description
Technical field
The present invention relates to a kind of treatment process of nitrous oxides exhaust gas.
Background technology
Nitrogen oxide (NO
x) mainly be meant NO
2And NO, the direct discharging of nox contained waste gas can cause serious environmental to pollute, and both is detrimental to health, and influences the growth of crops again, therefore must take effective method to handle.China contains NO at present
xThe method that exhaust gas treatment technology generally adopts has ammine selectivity catalytic reduction method and alkali absorption method.
The synthetic ammonia that the shortcoming of ammine selectivity catalytic reduction method is intended for reducing agent is chemical products, and device operating cost is higher, and also can cause NH in the operating process
3Secondary pollution.
The shortcoming of alkali absorption method is that equipment scale is huge, the removal of nitrogen oxide weak effect, and the concentration of NOx maintains 800～1000ppm in its discharging tail gas.
Summary of the invention
At the above-mentioned deficiency of ammine selectivity catalytic reduction method and alkali absorption method, technical problem to be solved by this invention be propose that a kind of technology is simple, SR is little, operating cost is low, non-secondary pollution, nitrogen oxide handle the catalytic reduction treatment process of nox contained waste gas completely.
In order to solve the problems of the technologies described above, the catalytic reduction treatment process of a kind of nox contained waste gas that the present invention proposes, its innovative point is that nox contained waste gas mixes with fuel gas, with noble metal platinum, palladium, rhodium ceramic honey comb or honeycomb metal is catalyst, at pressure is 0～10MPa, temperature is to carry out catalytic reduction reaction in 20～720 ℃ the catalytic reactor, and nitrogen oxide is reduced to the nitrogen G﹠W.
Above-mentioned fuel gas of the present invention industrially select that synthetic ammonia speeds to exit for use, oven gas, natural gas, refinery dry gas and the production tail gas that contains alkane, alkene, aldehyde, alcohol, ester, aromatic hydrocarbon, hydrogen and carbon monoxide is as reducing agent.
As the preferred technical solution of the present invention, nox contained waste gas with at first after heater exhaust gas is heated to initiation temperature, enter catalytic reactor after fuel gas mixes; Heater exhaust gas is welded plate type heat exchanger or heat exchange of heat pipe or finned tube exchanger.
As another optimal technical scheme of the present invention, nox contained waste gas and fuel gas carry out entering behind the catalytic reduction reaction in catalytic reactor and enter chimney after waste heat boiler reclaims heat.
Be that example illustrates catalytic reduction reaction mechanism of the present invention with methane, hydrogen as fuel gas below.The following chemical reaction of main generation in the catalytic reduction reactor:
2H
2+O
2＝2H
2O+Q
CH
4+2O
2＝CO
2+2H
2O+Q
2H
2+O
2＝H
2O+Q
2H
2+2NO＝N
2+2H
2O+Q
4H
2+2NO
2＝N
2+4H
2O+Q
CH
4+2O
2＝CO
2+2H
2O+Q
CH
4+4NO＝CO
2+2N
2+2H
2O+Q
CH
4+2NO
2＝CO
2+N
2+2H
2O+Q
With respect to prior art, the present invention is that a kind of non-selective catalytic reduction processing contains NO
xThe technology of waste gas belong to catalytic reduction method with the ammine selectivity catalytic reduction method, but it is a reducing agent with cheap fuel gas, and operating cost is lower, and can not cause secondary pollution in the operating process; Compare with alkali absorption method, process equipment of the present invention is arranged compact, and floor space is little, and removal of nitrogen oxide is effective, in the time of can guaranteeing the nitrogen oxides of exhaust gas content, and system's energy stable operation, concentration of NOx is lower than 200ppm in its discharging tail gas.In addition, the catalyst size of process using of the present invention is big, mechanical strength is high, long service life, resistance reduce.
Description of drawings
Fig. 1 is the process chart of nox contained waste gas catalytic reduction treatment process of the present invention.
Fig. 2 is the structural representation of the used catalytic reactor of technology of the present invention.
Wherein: 1 is catalytic reactor; 2 is waste heat boiler; 3 is heater exhaust gas; 4 is chimney; 11,12 is manhole; 13 is the gas access; 14 is gas vent; 15 is the catalytic fixed bed layer.
The specific embodiment
The invention will be further elaborated below in conjunction with drawings and Examples.
As illustrated in fig. 1 and 2, the catalytic reduction treatment process of a kind of nox contained waste gas that first embodiment of the invention provides, nox contained waste gas adopt certain chemical fertilizer factory of company nitric acid plant discharging tail gas, and working condition is as shown in table 1; Fuel gas adopts certain chemical fertilizer factory of company butyl octanol unit discharging tail gas, and working condition is as shown in table 2.
Above-mentioned nox contained waste gas enters catalytic reactor 1 by gas access 13 with after above-mentioned fuel gas mixes after heater exhaust gas 3 is heated to initiation temperature; The honeycomb platinum catalyst is fixed on the catalytic bed 15, and maintenance catalytic reactor 1 internal pressure is about 25KPa, temperature is about 400 ℃; Nox contained waste gas and fuel gas carry out catalytic reduction reaction in catalytic reactor 1, nitrogen oxide is reduced to the nitrogen G﹠W, and discharge a large amount of heat, enter from gas vent 14 and enter chimney 4 after waste heat boiler 2 reclaims heat.After testing, amount of nitrogen oxides is 159mg/Nm in the tail gas of chimney
3
Certain chemical fertilizer factory of company nitric acid tail gas condition table of table 1
| Project | Operating mode |
| N 2(mole %) | 94.87～91.87 |
| NO 2(mole %) | ≤0.35 |
| H 2O (mole %) | 0.69 |
| HNO 3(mole %) | ≤0.28 |
| O 2(mole %) | 3.5～6.5 |
| Exhaust flow (Nm3/h) | 38000 |
| Exhaust temperature ℃ | 30～60 |
| Tail gas pressure kPa (G) | 1.5 |
Certain chemical fertilizer factory of company fourth octanol tail gas condition table of table 2
As illustrated in fig. 1 and 2, the catalytic reduction treatment process of a kind of nox contained waste gas that second embodiment of the invention provides, nox contained waste gas adopt certain chemical fertilizer factory of company nitric acid plant discharging tail gas, and working condition is as shown in table 1; Fuel gas adopts certain chemical fertilizer factory of company butyl octanol unit discharging tail gas, and working condition is as shown in table 3.
Above-mentioned nox contained waste gas enters catalytic reactor 1 by gas access 13 with after above-mentioned fuel gas mixes after heater exhaust gas 3 is heated to initiation temperature; Honeycomb catalyst is fixed on the catalytic fixed bed layer 15, and maintenance catalytic reactor 1 internal pressure is about 25KPa, temperature is about 620 ℃; Above-mentioned nox contained waste gas and above-mentioned fuel gas carry out catalytic reduction reaction in catalytic reactor 1, nitrogen oxide is reduced to the nitrogen G﹠W, and discharge a large amount of heat, enter from gas vent 14 and enter chimney 4 after waste heat boiler 2 reclaims heat.After testing, amount of nitrogen oxides is 162mg/Nm3 in the tail gas of chimney.
Certain chemical fertilizer factory of company fourth octanol tail gas condition table of table 3.
The third embodiment of the present invention adopts the honeycomb rhodium catalyst, and catalytic reactor 1 internal pressure is about 25KPa, temperature is about 20 ℃; All the other are with embodiment 1.After testing, amount of nitrogen oxides is 204mg/Nm3 in the tail gas of chimney.
The fourth embodiment of the present invention adopts the honeycomb rhodium catalyst, and catalytic reactor 1 internal pressure is about 22KPa, temperature is about 700 ℃; All the other are with embodiment 1.After testing, amount of nitrogen oxides is 54mg/Nm3 in the tail gas of chimney.
The fifth embodiment of the present invention adopts the honeycomb platinum catalyst, and catalytic reactor 1 internal pressure is about 15KPa, temperature is about 550 ℃; All the other are with embodiment 1.After testing, amount of nitrogen oxides is 144mg/Nm3 in the tail gas of chimney.
The sixth embodiment of the present invention adopts the honeycomb palladium catalyst, and catalytic reactor 1 internal pressure is about 20KPa, temperature is about 600 ℃; All the other are with embodiment 2.After testing, amount of nitrogen oxides is 216mg/Nm3 in the tail gas of chimney.
The seventh embodiment of the present invention adopts the honeycomb rhodium catalyst, and catalytic reactor 1 internal pressure is about 18KPa, temperature is about 580 ℃; All the other are with embodiment 2.After testing, amount of nitrogen oxides is 75mg/Nm3 in the tail gas of chimney.
The eighth embodiment of the present invention adopts the honeycomb platinum catalyst, and catalytic reactor 1 internal pressure is about 30KPa, temperature is about 620 ℃; All the other are with embodiment 2.After testing, amount of nitrogen oxides is 163mg/Nm3 in the tail gas of chimney.
Certain chemical fertilizer factory of company nitric acid tail gas treating apparatus builds up on August 22nd, 2004 and comes into operation, and once drives successfully, and system is stable.Through device test run examination in 72 hours, nitric acid tail gas was discharged the waste gas amount of nitrogen oxides of battery limit (BL) well below discharging standards after PROCESS FOR TREATMENT of the present invention.The driving of nitric acid tail gas treatment system success has solved that ammine selectivity catalytic reduction method and alkali absorption method are handled nox contained waste gas processing cost height, formed secondary pollution, unit scale is big and many defectives such as removal of nitrogen oxide efficient difference.Adopted very perfect residual neat recovering system simultaneously, recovery waste heat to greatest extent, can produce 5～12 tons/time, 0.8MPa (G) steam has remarkable economic efficiency.The capital equipment floor space is 25 meters * 16 meters, enters in the tail gas of chimney the equal content of nitrogen oxide after the processing less than 200mg/Nm3.
Claims (10)
1. the catalytic reduction treatment process of a nox contained waste gas, it is characterized in that nox contained waste gas mixes with fuel gas, with noble metal platinum, palladium, rhodium ceramic honey comb or honeycomb metal is catalyst, at pressure is 0～10MPa, temperature is to carry out catalytic reduction reaction in 20～720 ℃ the catalytic reactor, and nitrogen oxide is reduced to the nitrogen G﹠W.
2. the catalytic reduction treatment process of nox contained waste gas according to claim 1 is characterized in that described fuel is for being selected from synthetic ammonia relief gas, oven gas, natural gas and refinery dry gas; And the production tail gas that contains alkane, alkene, aldehyde, alcohol, ester, aromatic hydrocarbon, hydrogen and carbon monoxide.
3. the catalytic reduction treatment process of nox contained waste gas according to claim 1 and 2 is characterized in that described fuel gas is selected from methane, ethane, propane, ethene, propylene, formaldehyde, acetaldehyde, propionic aldehyde, methyl alcohol, ethanol, propyl alcohol, ethylene glycol and butanols.
4. the catalytic reduction treatment process of nox contained waste gas according to claim 1 after it is characterized in that nox contained waste gas and fuel gas mixing, enters catalytic reactor after heater exhaust gas is heated to initiation temperature.
5. the catalytic reduction treatment process of nox contained waste gas according to claim 1, after it is characterized in that nox contained waste gas and fuel gas carry out catalytic reduction reaction in catalytic reactor, enter and enter chimney after waste heat boiler and heater exhaust gas reclaim heat.
6. the catalytic reduction treatment process of nox contained waste gas according to claim 1, it is characterized in that nox contained waste gas and fuel gas carry out catalytic reduction reaction in catalytic reactor after, directly enter and enter chimney after heater exhaust gas reclaims heat.
7. according to the catalytic reduction treatment process of claim 4 or 5 or 6 described nox contained waste gas, it is characterized in that described heater exhaust gas is welded plate type heat exchanger or heat exchange of heat pipe or finned tube exchanger.
8. the catalytic reduction treatment process of nox contained waste gas according to claim 1 is characterized in that this catalytic reduction treatment process has adopted the preheater that goes into operation, catalytic reactor, waste heat boiler, tail gas heat exchanger and chimney.
9. the catalytic reduction treatment process of nox contained waste gas according to claim 7 is characterized in that this catalytic reduction process using steam heater, electric heater, oil burner, gas burner carry out system's intensification and go into operation.
10. the catalytic reduction treatment process of nox contained waste gas according to claim 1, it is characterized in that: described catalytic reduction reactor adopts the fixed bed catalytic oxidation reactor, this fixed bed catalytic oxidation reactor is made up of two manholes, gas access, gas vent and catalyst fixed bed layer, catalyst fixed bed layer is positioned at reactor central authorities, the gas access is positioned at the reactor left side, gas vent is positioned at the reactor right side, and two manholes are positioned at reactor top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100281792A CN100417430C (en) | 2005-07-27 | 2005-07-27 | Process for catalytic reduction treatment of waste-air contg. nitrogen oxiden |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100281792A CN100417430C (en) | 2005-07-27 | 2005-07-27 | Process for catalytic reduction treatment of waste-air contg. nitrogen oxiden |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1903412A CN1903412A (en) | 2007-01-31 |
| CN100417430C true CN100417430C (en) | 2008-09-10 |
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| CNB2005100281792A Expired - Fee Related CN100417430C (en) | 2005-07-27 | 2005-07-27 | Process for catalytic reduction treatment of waste-air contg. nitrogen oxiden |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362051A (en) * | 2008-09-27 | 2009-02-11 | 上海东化环境工程有限公司 | Acrylonitrile device tail-gas treatment technique |
| CN102463030A (en) * | 2010-11-17 | 2012-05-23 | 中国石油化工股份有限公司 | Method for removing nitric oxide in tail gas for preparing oxalate from CO |
| CN105605595B (en) * | 2016-01-12 | 2017-12-29 | 北京化工大学 | The industrial waste gas integrated purifying method and system of class containing cyanogen, hydro carbons and NOx |
| CN108452674A (en) * | 2018-04-12 | 2018-08-28 | 陕西大秦环保设备有限公司 | A kind of efficient control device and method of gas fired-boiler nitrogen oxides |
-
2005
- 2005-07-27 CN CNB2005100281792A patent/CN100417430C/en not_active Expired - Fee Related
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| CN1903412A (en) | 2007-01-31 |
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