CN1745872A - Allantoic solution for absorbing Nox and purification of waste gas containing Nox - Google Patents
Allantoic solution for absorbing Nox and purification of waste gas containing Nox Download PDFInfo
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- CN1745872A CN1745872A CN 200510014742 CN200510014742A CN1745872A CN 1745872 A CN1745872 A CN 1745872A CN 200510014742 CN200510014742 CN 200510014742 CN 200510014742 A CN200510014742 A CN 200510014742A CN 1745872 A CN1745872 A CN 1745872A
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- tower
- urea liquid
- waste gas
- cat head
- acid
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Abstract
A urea solution for absorbing NOX contains CO(NH2)2 (5-12 Wt%), H2O2 (0.5-2) and water (rest). A process for cleaning the waste gas containing NOX by said urea solution includes such steps as closed-loop circulation absorption by use of 2-3 nitric acid solution absorbing towers and closed-loop circulation absorption by use of 1-2 absorbing towers containing said urea solution. Its advantages are high efficient and no secondary pollution.
Description
Technical field
The present invention relates to a kind of absorption of N O that is used for
XUrea liquid, and use urea liquid and purify and contain NO
XThe method of waste gas, the particularly purification method of the nitrogen-containing oxide process tail gas that is produced in the department of production and application nitric acid.
Background technology
Nitrogen oxide is one of important source of atmospheric pollution, and its harm is serious day by day, not only can cause acid rain, acid mist, can also damage the ozone layer, bring serious harm for natural environment and human being's production, life, at present, along with the appearance and the environmental protection of new environmental protection policy prevents and treats continuing to increase of dynamics, contain NO
XWaste gas pollution control and treatment has become the important component part of environmental protection, also is the most important condition that industry is gone into operation and moved.Nitrogen oxide is mainly derived from the production process and the use of combustion process and other pyroprocess, nitric acid, its groundwater pollution control mainly comprises: improve combustion system and nitric acid production technology, catalytic reduction method, catalyze plasma activation method, biochemical process, absorption method, liquid absorption method etc.In above the whole bag of tricks, industrial application is more catalytic reduction method, absorption method and liquid absorption method.Catalytic reduction method is higher to the removal efficiency of nitrogen oxide, but operating cost is very high, and source of the gas also needs preliminary treatment preventing catalyst poisoning, and causes easily secondary pollution in the discharging gas; The characteristics such as it is simple that absorption method improvement nitrous oxides exhaust gas has technology, and operating flexibility is big, but adsorption capacity is not enough big, and operating cost is higher, and the regeneration difficulty; Liquid absorption method is because technological process and comparison in equipment are simple, mature technical route, and extensive use in industry, but this method ubiquity removal efficiency is not high, and produce easily secondary pollution, therefore need to improve.
Summary of the invention
The object of the present invention is to provide a kind of absorption of N O that is used for
XUrea liquid, adopt this solution absorption of N O
XNot only improve organic efficiency, and can not cause secondary pollution.
Another object of the present invention is to provide a kind of application urea liquid to purify and contain NO
XThe method of waste gas adopts this method operating cost cheap, and removal effect is remarkable, and technological process is simple, and technology path is reliable.
Of the present invention a kind of for absorbing NO
XUrea liquid, it includes following component, its weight percentage is: CO (NH
2)
2Be 5%-12%, H
2O
2Be 0.5%-2%, water is surplus.
Application urea liquid of the present invention purifies and contains NO
XThe method of waste gas, it may further comprise the steps:
(1) will contain NO
XWaste gas is introduced first acid tower from cat head and is absorbed with the salpeter solution that sprays from cat head and stream;
(2) will at the bottom of tower, send into second acid tower or send into second, third acid tower successively from the described waste gas that first acid tower is discharged, with reverse contact of salpeter solution from the cat head spray;
(3) will send into the first urea liquid absorption tower or send into successively first, second urea liquid absorption tower from the described waste gas that last acid tower ejects, contact processing afterwards from the cat head discharge with the urea liquid that sprays from cat head is reverse, the urea liquid in described each urea liquid absorption tower is for getting CO (NH
2)
2, H
2O
2, water stirs at stirring pool in described ratio and makes, and the time of staying of described waste gas in each urea liquid absorption tower is 5s-10s;
(4) sprinkle density of each the cat head spray solution in the described step (1) to (3) is 10-22m
3/ m
2H.Compare with similar nitrogen oxide improvement technology, the present invention has the following advantages:
(1) added hydrogen peroxide reagent in the solution, thereby improved removal efficiency, and adaptability is strong, easy to operate and elasticity is big, even also can reach removal effect preferably under the normal temperature.
(2) the most nitrogen oxide resource in the nitrous oxides exhaust gas can be reclaimed in acid tower, first tower adopts and stream absorbs, and more is conducive to oxidation limit, limit and absorbs, and product is salpeter solution, has saved resource, has reduced entreprise cost.
(3) it is owned by France in pure consumption-type exhaust gas treatment method that urea absorbs decomposition-reduction, waste liquid after absorption is finished comes back to the urea dissolving tank through pans, no longer consume water has avoided acid pollution water body, the byproduct of technologies existence such as traditional WATER-WASHING METHOD, alkali absorb method, selectivity catalysis ammonia reducing process to be difficult to more than recovery, the side reaction and secondary pollution problems.
Description of drawings
Fig. 1 is for adopting two salpeter solution absorption towers and the close circulation technology flow chart that the urea liquid absorption tower consists of;
Fig. 2 is for adopting three salpeter solution absorption towers and two close circulation technology flow charts that the urea liquid absorption tower consists of.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in detail.
Of the present invention a kind of for absorbing NO
XUrea liquid, it includes following component, its weight percentage is: CO (NH
2)
2Be 5%-12%, 8%-12% preferably, H
2O
2Be 0.5%-2%, 1%-2% preferably, water is surplus.Described urea liquid is prepared as follows, gets CO (NH
2)
2, H
2O
2In hopper, stir in proportion with water and to get final product.
Now just the process chart of Fig. 1 comes the purification of application urea liquid to contain NO
XThe method of waste gas, nox contained waste gas is introduced acid tower 2 by air compressor 1 from cat head, absorbs with salpeter solution and stream, and the waste gas that comes out from acid tower 2 enters acid tower 3 at the bottom of tower, with reverse contact of salpeter solution from the cat head spray; Afterwards, introduce urea liquid absorption tower 4 from the waste gas that acid tower comes out, discharge from cat head after processing.Described each tower all adopts closed cycle to absorb, when the salpeter solution concentration expressed in percentage by weight in first tower reaches 45-55%, can be with salpeter solution fluid at the bottom of the tower, return production process and carry out finished product processing or utilization again, then the salpeter solution on second absorption tower is gone to the absorption liquid of first tower as first tower, second tower is added fresh water.Adopt technological process shown in Figure 2 then each tower all adopt closed cycle operation, after nox contained waste gas is introduced first acid tower 2 by air compressor 1 from cat head, send into second again, the 3rd acid tower 3,4, described first, second, the 3rd acid tower 2,3, salpeter solution in 4 adopts dilute nitric acid solution or fresh water when going into operation for the first time, after operation a period of time, salpeter solution concentration in first tower reaches 45～55% and carries out discharging when above, return production process and carry out finished product processing or utilization again, then the salpeter solution on second absorption tower is gone to the absorption liquid of first tower as first tower, the absorption liquid of the 3rd tower goes to the absorption liquid of second tower as second tower, and last nitric acid absorber produces adds dilute nitric acid solution or fresh water behind the solution as absorption liquid.The described waste gas that comes out from the 3rd acid tower enters first, second urea liquid tower 5,6 successively and handles.The time of staying of described waste gas in Fig. 1, Fig. 2 flow process in each urea liquid absorption tower is 5s-10s, and overstand will increase the equipment investment expense, and the time of staying, the too short removal efficiency that will cause reduced.The sprinkle density of described each tower absorption liquid is 10-22m
3/ m
2H, if sprinkle density is too small, then nitrogen oxide can not absorb in the absorption tower fully, if sprinkle density is excessive, not only operating cost increases, and causes liquid flooding easily, on the other hand, night, film blocked uply also can bring certain influence to removal effect.Urea liquid in the urea liquid absorption tower is got CO (NH
2)
2, H
2O
2In hopper, stir in described ratio with water and to make.When operation a period of time, urea concentration is added urea reagent and hydrogen peroxide reagent after reducing.The present invention adopts tower and tower internals all to adopt corrosion resistant plastics, pottery or stainless steel.
Nitrogen-containing oxide 4567mg/m
3Waste gas by air compressor with 5m
3The flow of/h is introduced first acid tower from cat head, and the concentration expressed in percentage by weight of salpeter solution is 35% in described first acid tower, and with salpeter solution and stream absorption from the cat head spray, sprinkle density is 22m
3/ m
2H, the waste gas that comes out from first acid tower enters second acid tower at the bottom of tower, and with reverse contact of salpeter solution from the cat head spray, sprinkle density is 18m
3/ m
2H, the concentration expressed in percentage by weight of salpeter solution is 10% in described second acid tower; Afterwards, the waste gas that comes out from acid tower is introduced the urea liquid absorption tower, and discharges from cat head after processing from reverse contact of the urea liquid of cat head spray, and described urea liquid spray density is 22m
3/ m
2H, the time of staying of described waste gas in the urea liquid absorption tower is 5s; Urea liquid in the described urea liquid absorption tower is: the solution weight percentage concentration is 10% CO (NH
2)
2, concentration expressed in percentage by weight is 2% H
2O
2, surplus is water.The absorption temperature of each tower is 28 ℃, and nitrous oxides concentration is 106mg/m after absorbing
3
Embodiment 2
Nitrogen-containing oxide 5289mg/m
3Waste gas by air compressor with 5m
3The flow of/h is introduced first acid tower from cat head, and the concentration expressed in percentage by weight of salpeter solution is 40% in described first acid tower, and with salpeter solution and stream absorption from the cat head spray, sprinkle density is 10m
3/ m
2H, the waste gas that comes out from first acid tower enters second acid tower at the bottom of tower, and with reverse contact of salpeter solution from the cat head spray, sprinkle density is 10m
3/ m
2H, the concentration expressed in percentage by weight of salpeter solution is 8% in described second acid tower; Afterwards, the waste gas that comes out from acid tower is introduced the urea liquid absorption tower, and discharges from cat head after processing from reverse contact of the urea liquid of cat head spray, and described urea liquid spray density is 15m
3/ m
2H, the time of staying of described waste gas in the urea liquid absorption tower is 10s; Urea liquid in the described urea liquid absorption tower is: the solution weight percentage concentration is 5% CO (NH
2)
2, concentration expressed in percentage by weight is 1% H
2O
2, surplus is water.The absorption temperature of each tower is 28 ℃, and nitrous oxides concentration is 186mg/m after absorbing
3
Embodiment 3
Nitrogen-containing oxide 8693mg/m
3Waste gas by air compressor with 5m
3The flow of/h is introduced first acid tower from cat head, and the concentration expressed in percentage by weight of salpeter solution is 35% in described first acid tower, and with salpeter solution and stream absorption from the cat head spray, sprinkle density is 17m
3/ m
2H, the waste gas that comes out from first acid tower enters second acid tower at the bottom of tower, and with reverse contact of salpeter solution from the cat head spray, sprinkle density is 17m
3/ m
2H, the concentration expressed in percentage by weight of salpeter solution is 8% in described second acid tower, and the waste gas that comes out from second acid tower enters the 3rd acid tower at the bottom of tower, and with reverse contact of salpeter solution from the cat head spray, sprinkle density is 17m
3/ m
2H, the concentration expressed in percentage by weight of salpeter solution is 3% in described the 3rd acid tower; Afterwards, introduce the first urea liquid absorption tower from the waste gas that acid tower comes out, with reverse contact of urea liquid from the cat head spray, described urea liquid spray density is 17m
3/ m
2H, the time of staying of described waste gas in the urea liquid absorption tower is 6s, waste gas after the processing of the first urea liquid absorption tower is sent into the second urea liquid absorption tower, discharge from cat head with reverse the contact again of the urea liquid that sprays from cat head, the urea liquid spray density in the described second urea liquid absorption tower is 17m
3/ m
2H, the time of staying of described waste gas in the urea liquid absorption tower is 7s; Urea liquid in the described urea liquid absorption tower is: the solution weight percentage concentration is 12% CO (NH
2)
2, concentration expressed in percentage by weight is 0.5% H
2O
2, surplus is water.The absorption temperature of each tower is 30 ℃, and nitrous oxides concentration is 139mg/m after absorbing
3
Claims (3)
1. one kind is used for absorbing NO
XUrea liquid, it is characterized in that it includes following component, its weight percentage is: CO (NH
2)
2Be 5%-12%, H
2O
2Be 0.5%-2%, water is surplus.
2. according to claim 1 for absorbing NO
XUrea liquid, it is characterized in that: described CO (NH
2)
2Weight percentage is 8%-12%, H
2O
2Weight percentage is 1%-2%.
3. use the urea liquid purification and contain NO
XThe method of waste gas is characterized in that it may further comprise the steps:
(1) will contain NO
XWaste gas is introduced first acid tower from cat head and is absorbed with the salpeter solution that sprays from cat head and stream;
(2) will at the bottom of tower, send into second acid tower or send into second, third acid tower successively from the described waste gas that first acid tower is discharged, with reverse contact of salpeter solution from the cat head spray;
(3) will send into the first urea liquid absorption tower or send into successively first, second urea liquid absorption tower from the described waste gas that last acid tower ejects, contact processing afterwards from the cat head discharge with the urea liquid that sprays from cat head is reverse, the urea liquid in described each urea liquid absorption tower is for getting CO (NH
2)
2, H
2O
2, water stirs at stirring pool in described ratio and makes, and the time of staying of described waste gas in each urea liquid absorption tower is 5s-10s;
The sprinkle density of each the cat head spray solution in the described step (1) to (3) is 10-22m
3/ m
2H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510014742 CN1745872A (en) | 2005-08-15 | 2005-08-15 | Allantoic solution for absorbing Nox and purification of waste gas containing Nox |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510014742 CN1745872A (en) | 2005-08-15 | 2005-08-15 | Allantoic solution for absorbing Nox and purification of waste gas containing Nox |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1745872A true CN1745872A (en) | 2006-03-15 |
Family
ID=36165689
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510014742 Pending CN1745872A (en) | 2005-08-15 | 2005-08-15 | Allantoic solution for absorbing Nox and purification of waste gas containing Nox |
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|---|---|
| CN (1) | CN1745872A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575116B (en) * | 2009-06-02 | 2011-01-12 | 烟台招金励福贵金属股份有限公司 | Method for reducing nitrogen oxides during preparation of silver nitrate |
| CN102407068A (en) * | 2010-09-25 | 2012-04-11 | 潍坊信誉环境工程有限公司 | Acidic water solution for absorbing NOx and method for purifying NOx-containing waste gas by applying same |
| CN101708422B (en) * | 2009-12-14 | 2012-05-02 | 南京师范大学 | Method for simultaneously desulphurizing and denitrating coal-fired flue gas by limestone-gypsum method |
| CN102805996A (en) * | 2012-08-15 | 2012-12-05 | 中国石油集团东北炼化工程有限公司锦州设计院 | Purification treatment process and system for nitrogen oxide waste gas generated during preparation of catalyst for butadiene through oxidative dehydrogenation of butene |
| CN105327608A (en) * | 2015-11-20 | 2016-02-17 | 四川北方硝化棉股份有限公司 | Device and method for recovering gas of nitrogen oxides in production process of nitro-cotton |
| CN106215627A (en) * | 2016-08-30 | 2016-12-14 | 安徽金禾实业股份有限公司 | A kind of method of hydrogen peroxide liquid oxidatively absorption process treatment of nitric acid tail gas |
| CN107051168A (en) * | 2017-06-14 | 2017-08-18 | 中冶京诚工程技术有限公司 | The integrated apparatus and method of a kind of flue gas low-temperature denitration |
| CN108031285A (en) * | 2017-12-01 | 2018-05-15 | 南通三创机械制造有限公司 | A kind of redox denitrfying agent |
| CN109126431A (en) * | 2018-08-03 | 2019-01-04 | 杭州电子科技大学 | The device and method of liquid phase adsorption formula oxidation-reduction method denitrating flue gas |
| CN111467946A (en) * | 2020-04-22 | 2020-07-31 | 运城学院 | NO in preparation process of molecular sieve catalystxMethod for treating exhaust gas |
| CN115400567A (en) * | 2022-10-12 | 2022-11-29 | 中核四0四有限公司 | Method for treating nitrogen oxide tail gas in spent fuel post-treatment |
-
2005
- 2005-08-15 CN CN 200510014742 patent/CN1745872A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575116B (en) * | 2009-06-02 | 2011-01-12 | 烟台招金励福贵金属股份有限公司 | Method for reducing nitrogen oxides during preparation of silver nitrate |
| CN101708422B (en) * | 2009-12-14 | 2012-05-02 | 南京师范大学 | Method for simultaneously desulphurizing and denitrating coal-fired flue gas by limestone-gypsum method |
| CN102407068A (en) * | 2010-09-25 | 2012-04-11 | 潍坊信誉环境工程有限公司 | Acidic water solution for absorbing NOx and method for purifying NOx-containing waste gas by applying same |
| CN102805996A (en) * | 2012-08-15 | 2012-12-05 | 中国石油集团东北炼化工程有限公司锦州设计院 | Purification treatment process and system for nitrogen oxide waste gas generated during preparation of catalyst for butadiene through oxidative dehydrogenation of butene |
| CN102805996B (en) * | 2012-08-15 | 2014-07-23 | 中国石油集团东北炼化工程有限公司锦州设计院 | Purification treatment process and system for nitrogen oxide waste gas generated during preparation of catalyst for butadiene through oxidative dehydrogenation of butene |
| CN105327608A (en) * | 2015-11-20 | 2016-02-17 | 四川北方硝化棉股份有限公司 | Device and method for recovering gas of nitrogen oxides in production process of nitro-cotton |
| CN106215627A (en) * | 2016-08-30 | 2016-12-14 | 安徽金禾实业股份有限公司 | A kind of method of hydrogen peroxide liquid oxidatively absorption process treatment of nitric acid tail gas |
| CN107051168A (en) * | 2017-06-14 | 2017-08-18 | 中冶京诚工程技术有限公司 | The integrated apparatus and method of a kind of flue gas low-temperature denitration |
| CN107051168B (en) * | 2017-06-14 | 2023-10-13 | 中冶京诚工程技术有限公司 | Integrated device and method for low-temperature denitration of flue gas |
| CN108031285A (en) * | 2017-12-01 | 2018-05-15 | 南通三创机械制造有限公司 | A kind of redox denitrfying agent |
| CN109126431A (en) * | 2018-08-03 | 2019-01-04 | 杭州电子科技大学 | The device and method of liquid phase adsorption formula oxidation-reduction method denitrating flue gas |
| CN111467946A (en) * | 2020-04-22 | 2020-07-31 | 运城学院 | NO in preparation process of molecular sieve catalystxMethod for treating exhaust gas |
| CN115400567A (en) * | 2022-10-12 | 2022-11-29 | 中核四0四有限公司 | Method for treating nitrogen oxide tail gas in spent fuel post-treatment |
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