CN102688687A - New process for catalytic decomposition of nitric acid tail gas N2O - Google Patents
New process for catalytic decomposition of nitric acid tail gas N2O Download PDFInfo
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- CN102688687A CN102688687A CN2012101625858A CN201210162585A CN102688687A CN 102688687 A CN102688687 A CN 102688687A CN 2012101625858 A CN2012101625858 A CN 2012101625858A CN 201210162585 A CN201210162585 A CN 201210162585A CN 102688687 A CN102688687 A CN 102688687A
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- nitric acid
- tail gas
- acid tail
- catalytic decomposition
- catalyst
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Abstract
The invention relates to a new process for catalytic decomposition of nitric acid tail gas N2O.Nitric acid tail gas is fed into a catalytic decomposition device and exchange heat with a heat accumulator on one side of the catalytic decomposition device so as to raise the temperature to 350 DEG C-380 DEG C; then the nitric acid tail gas enters into an intermediate warming chamber of the catalytic decomposition device to raise the temperature to 500 DEG C-650 DEG C, and then contacts with a catalyst on the other side; the N2O is subjected to the catalytic decomposition by the catalyst and is decomposed into nitrogen and oxygen, and the decomposed gas is subjected to heat recovery via the heat accumulator on the side and then discharged to the atomosphere. The catalyst is a honeycomb zeolite catalyst, does not contain heavy metal and noble metal, and at least contains the following ingredients in percentage by weight: 0-2% of Fe2O3, 0-2% of Al2O3, 2-19% of SiO2, and 75-90% of ceramic material. The process has the advantages of low requirementof impurities, no requirement of nitric acid tail gas NOX, low activation temperature, high decomposition efficiency and stability.
Description
Technical field
The present invention relates to a kind of catalytic decomposition nitric acid tail gas N
2 The new technology of O.
Background technology
Nitric acid tail gas N
2The O decomposition technique is promptly installed N between absorption tower and aiutage
2O catalytic decomposition device.The catalytic decomposition device is the honeycomb type that precious metal palladium is set in ceramic material with catalyst at present, and wherein precious metal palladium content is between 0.35-0.50%, and the catalyst specification is 150 mm x, 150 mm x, 50 mm.
N
2The O decomposition reaction is following:
N
2O →?N
2?+?(1/2)?O
2
Existing catalytic decomposition nitric acid tail gas N
2O technology not enough as follows:
1) the operating condition lotus is carved.This precious metal palladium catalyst is very sensitive to following pollutant: heavy metal and alkali metal are such as lead, mercury, arsenic, antimony, sodium, potassium, lithium, zinc, copper, tin, iron, nickel and cadmium, and sulphur, silicon, phosphorus, fluorine, chlorine, iodine and dust.Therefore the source of the gas that requires to get into decomposing system comprises that nitric acid tail gas, combustion air, sealing air etc. are all very clean.
2) the catalyst activity decay is very fast, and through the producer that uses the type catalyst is understood, operation is less than half a year, and emission reduction efficiency just descended more than 50% after emission reduction efficiency just descended about 20%, one year.
3) light-off temperature is high.Operating temperature range is 450-600 ℃, but the actual motion temperature must reach just demonstration activity more than 550 ℃, is lower than 550 ℃, and efficient is just very low, and is almost inefficent below 500 ℃.
4) to NO in the nitric acid tail gas
XRequirement is at 300mg/Nm
3Below, therefore must be contained in NO
XRemove the system back.
Summary of the invention
The technical problem that the present invention will solve is: provide the cellular zeolite type catalyst of a kind of usefulness to decompose nitric acid tail gas N as catalyst
2That the new technology of O, this technology have is less demanding to impurity, to nitric acid tail gas NO
XDo not require, light-off temperature is low and decomposition efficiency is high and advantage such as stable, has solved the problem that exists in the above-mentioned prior art.
The technical scheme that solves the problems of the technologies described above is: a kind of catalytic decomposition nitric acid tail gas N
2The new technology of O feeds nitric acid tail gas in the catalytic decomposition device, intensification chamber, left side reative cell and right side reative cell in the middle of described catalytic decomposition device comprises; Left side reative cell and right side reative cell load heat storage and catalyst respectively, and when initially driving, the heat storage of both sides need be warmed up to 450 ℃～500 ℃; Nitric acid tail gas gets into from a side reaction chamber earlier, with the heat storage heat exchange, makes the nitric acid tail gas temperature rise to 350 ℃～380 ℃; Intensification chamber in the middle of nitric acid tail gas gets into then; Provide heat to make nitric acid tail gas be warming up to 500 ℃～650 ℃ by speed venting or combustion of natural gas, nitric acid tail gas gets into the opposite side reative cell again and contacts with catalyst, through catalyst catalytic decomposition N
2O, N
2O is broken down into nitrogen and oxygen; Gas after the decomposition enters atmosphere after this side heat storage reclaims heat; Described catalyst is cellular zeolite type catalyst, and described catalyst does not contain heavy metal and noble metal, and described catalyst comprises following component in percentage by weight: Fe at least
2O
3: 0～2%, Al
2O
3: 0～2%, SiO
2: 2～19%, ceramic material: 75～90%.
The both sides reative cell is imported and exported each other, switches once in per 3～5 minutes.
Further technical scheme of the present invention is: described catalyst comprises following component in percentage by weight: Fe at least
2O
3: 1～2%, Al
2O
3: 1～2%, SiO
2: 15～19%, ceramic material: 75～77%.
The specification of described catalyst is: 150 mm * 150 mm * 300 mm.
The described venting of speeding is synthetic ammonia relief gas.
A kind of catalytic decomposition nitric acid tail gas N of the present invention
2The new technology of O has following beneficial effect:
1) less demanding to impurity, especially anti-sulphur, phosphorus etc. are not subject to impurity and poison.
2) to nitric acid tail gas NO
XDo not require N
2O catalytic decomposition device can be installed in NO
XRemove before the system, or need not remove NO in advance
X
3) light-off temperature is low.Operating temperature range is 350-650 ℃, and temperature reaches 500 ℃ can show good efficiencies.
4) decomposition efficiency is high and stable.Peak efficiency reaches more than 98%, and keeps stable, and decay is slow.
Below, in conjunction with accompanying drawing and embodiment a kind of catalytic decomposition nitric acid tail gas N to the present invention
2The technical characterictic of the new technology of O is further described.
Description of drawings
Fig. 1: process flow diagram of the present invention.
Among the figure: 1-heat storage, intensification chamber in the middle of the 2-catalyst, 3-.
The specific embodiment
Embodiment 1: a kind of catalytic decomposition nitric acid tail gas N
2The new technology of O feeds nitric acid tail gas in the catalytic decomposition device, intensification chamber, left side reative cell and right side reative cell in the middle of described catalytic decomposition device comprises; Left side reative cell and right side reative cell load heat storage and catalyst respectively, and catalyst is positioned at the heat storage top, when initially driving; The both sides heat storage need be warmed up to 450 ℃～500 ℃; Nitric acid tail gas gets into from a side earlier, with this side heat storage heat exchange, makes the nitric acid tail gas temperature more than 100 ℃ rise to 350 ℃～380 ℃; Intensification chamber in the middle of nitric acid tail gas gets into then; Provide heat to make nitric acid tail gas be warming up to 500 ℃～650 ℃ by synthetic ammonia relief gas or combustion of natural gas, nitric acid tail gas gets into the opposite side reative cell again and contacts with catalyst, through catalyst catalytic decomposition N
2O, N
2O is broken down into nitrogen and oxygen, and the gas after the decomposition enters atmosphere after this side heat storage reclaims heat.The both sides reative cell is imported and exported each other, switches once, and is controlled by PLC in per 3 ~ 5 minutes.Described catalyst is cellular zeolite type catalyst; Described catalyst does not contain heavy metal (heavy metal is meant copper, lead, zinc, tin, nickel, cobalt, antimony, mercury and bismuth) and noble metal (noble metal is meant gold, platinum, palladium and silver), and described catalyst comprises following component in percentage by weight: Fe at least
2O
3: 1～2%, Al
2O
3: 1～2%, SiO
2: 15～19%, ceramic material: 75～77%.The specification of described catalyst is: 150 mm * 150 mm * 300 mm.
As a kind of conversion of the embodiment of the invention, described catalyst can also adopt the specification of other suitable dimensions as required.
Cellular zeolite type catalyst of the present invention, be with zeolite-loaded on cellular ceramic material, described catalyst includes following component in percentage by weight: Fe
2O
3: 0～2%, Al
2O
3: 0～2%, SiO
2: 2～19%, ceramic material: 75～90%, and do not contain heavy metal and noble metal.
Claims (5)
1. catalytic decomposition nitric acid tail gas N
2The new technology of O is characterized in that: nitric acid tail gas is fed in the catalytic decomposition device intensification chamber, left side reative cell and right side reative cell in the middle of described catalytic decomposition device comprises; Left side reative cell and right side reative cell load heat storage and catalyst respectively; During initial the driving, the heat storage of both sides need be warmed up to 450 ℃～500 ℃, and nitric acid tail gas gets into from a side reaction chamber earlier; With the heat storage heat exchange; Make the nitric acid tail gas temperature rise to 350 ℃～380 ℃, intensification chamber in the middle of nitric acid tail gas gets into then, venting or combustion of natural gas provide heat to make nitric acid tail gas be warming up to 500 ℃～650 ℃ by speeding; Nitric acid tail gas gets into the opposite side reative cell again and contacts with catalyst, through catalyst catalytic decomposition N
2O, N
2O is broken down into nitrogen and oxygen; Gas after the decomposition enters atmosphere after this side heat storage reclaims heat; Described catalyst is cellular zeolite type catalyst, and described catalyst does not contain heavy metal and noble metal, and described catalyst comprises following component in percentage by weight: Fe at least
2O
3: 0～2%, Al
2O
3: 0～2%, SiO
2: 2～19%, ceramic material: 75～90%.
2. a kind of catalytic decomposition nitric acid tail gas N according to claim 1
2The new technology of O is characterized in that: the both sides reative cell is imported and exported each other, switches once in per 3～5 minutes.
3. a kind of catalytic decomposition nitric acid tail gas N according to claim 1 and 2
2The new technology of O is characterized in that: described catalyst comprises following component in percentage by weight: Fe at least
2O
3: 1～2%, Al
2O
3: 1～2%, SiO
2: 15～19%, ceramic material: 75～77%.
4. a kind of catalytic decomposition nitric acid tail gas N according to claim 1 and 2
2The new technology of O is characterized in that: the specification of described catalyst is: 150 mm * 150 mm * 300 mm.
5. a kind of catalytic decomposition nitric acid tail gas N according to claim 1 and 2
2The new technology of O is characterized in that: the described venting of speeding is synthetic ammonia relief gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101625858A CN102688687A (en) | 2012-05-24 | 2012-05-24 | New process for catalytic decomposition of nitric acid tail gas N2O |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101625858A CN102688687A (en) | 2012-05-24 | 2012-05-24 | New process for catalytic decomposition of nitric acid tail gas N2O |
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|---|---|
| CN102688687A true CN102688687A (en) | 2012-09-26 |
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|---|---|---|---|
| CN2012101625858A Pending CN102688687A (en) | 2012-05-24 | 2012-05-24 | New process for catalytic decomposition of nitric acid tail gas N2O |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1395502A (en) * | 2000-01-14 | 2003-02-05 | 克鲁普犹德有限公司 | Method for removal of NOx and N2O from residual gas in nitric acid production |
| WO2011094159A1 (en) * | 2010-01-26 | 2011-08-04 | Shell Oil Company | A process for removing nitrous oxide from a gas stream |
| CN102438746A (en) * | 2009-03-24 | 2012-05-02 | 韩国能量技术研究院 | Iron-impregnated zeolite catalysts and method for production thereof, and method for reducing nitrous oxide alone or nitrous oxide and nitrogen monoxide simultaneously using the catalysts |
-
2012
- 2012-05-24 CN CN2012101625858A patent/CN102688687A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1395502A (en) * | 2000-01-14 | 2003-02-05 | 克鲁普犹德有限公司 | Method for removal of NOx and N2O from residual gas in nitric acid production |
| CN102438746A (en) * | 2009-03-24 | 2012-05-02 | 韩国能量技术研究院 | Iron-impregnated zeolite catalysts and method for production thereof, and method for reducing nitrous oxide alone or nitrous oxide and nitrogen monoxide simultaneously using the catalysts |
| WO2011094159A1 (en) * | 2010-01-26 | 2011-08-04 | Shell Oil Company | A process for removing nitrous oxide from a gas stream |
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Application publication date: 20120926 |