CN108114596A - A kind of composition and its application method for purifying nitrogen oxides - Google Patents
A kind of composition and its application method for purifying nitrogen oxides Download PDFInfo
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- CN108114596A CN108114596A CN201711366974.1A CN201711366974A CN108114596A CN 108114596 A CN108114596 A CN 108114596A CN 201711366974 A CN201711366974 A CN 201711366974A CN 108114596 A CN108114596 A CN 108114596A
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- nitrogen oxides
- aqueous solution
- sodium chlorite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
Abstract
The present invention provides a kind of composition and its application method for purifying nitrogen oxides, wherein, composition includes the aqueous solution of sodium chlorite aqueous solution, catalytic ceramics ball and reducing agent, the catalytic ceramics ball is attached on filler porcelain ball by catalyst and is formed, said composition application method covers for sodium chlorite aqueous solution first is atomized into fine drop and passes through catalytic ceramics ball, adverse current is formed with the gas of nitrogen-containing oxide, the NO oxidations in gas containing nitrogen oxide are generated NO by sodium chlorite2, then the oxides of nitrogen gas after oxidation is passed through in the aqueous solution of reducing agent and carries out reaction generation N2, so as to fulfill purification nitrogen oxides.Using said composition energy deep purifying nitrogen oxides, purifying rate is up to more than 88%, and required equipment is simply at low cost, the NO being more suitable in purification diesel engine emissionX。
Description
Technical field
The present invention relates to polluted gas Treatment process field, more particularly, to a kind of composition for purifying nitrogen oxides
And its application method.
Background technology
With economic fast development, problem of environmental pollution getting worse caused by energy consumption.At present, the whole world
NOx emission total amount be up to 58,000,000 tons/it is annual.NOx is very big to the detrimental effect of environment, it is both the main matter to form acid rain
One of and formed air in photochemical fog important substance and consumption O3An important factor.
Exhaust emissions of diesel engine is just based on PM (particulate material) and NOx, and NO is accounted in the NOx of diesel engine discharge
90%.The nitrogen oxides of purification diesel engine discharge at present is mainly using selective catalytic reduction (SCR), with NH3For reducing agent,
In V2O5, under the action of the catalyst such as Fe molecular sieves or Cu molecular sieves, NOx in oxygen-enriched tail gas is selectively reduced to N2.It is actual
In, SCR system is 32.5% aqueous solution of urea as NH mostly using mass fraction3Source, aqueous solution of urea is with fine droplet
Form is spurted into the exhaust pipe before SCR converter, and temperature occurs pyrolytic reaction and generate HNCO and NH at 200 DEG C or more3。
Used urea SCR system is there is pipeline is perishable, nozzle life is short, urea deposits and the problems such as catalyst easy in inactivation, and the party
Method consumes substantial amounts of ammonia resource, and agrochemical production and use are adversely affected.
Therefore sight is turned to wet method denitrogenation from exhaust smoke by people.Publication number CN101385942A disclose a kind of liquid phase oxidation-
Absorption two-stage wet method flue-gas denitration technique, using potassium permanganate, sodium chlorite, sodium hypochlorite, calcium hypochlorite, hydrogen peroxide, two
The solution of one or several kinds of mixtures makes the nitric oxide in flue gas be contacted with oxidant instead as oxidant in chlorine monoxid
Should, partial oxidation utilizes lye to absorb the nitrogen oxides after peroxidating in flue gas into after nitrogen dioxide, generates corresponding sub-
Nitrate.But in the prior art, by the nitric oxide partial oxidation in flue gas into nitrogen dioxide, it is necessary to according to exhaust gas volumn and cigarette
The concentration of nitrogen oxides determines the parameters such as concentration, pH value, liquid-gas ratio and the oxidant increment of Oxygen in Liquid agent in gas, is related to ginseng
Number is more, it is more difficult to accurate control degree of oxidation, and also final denitration efficiency is more than 80%, need to be improved.
The content of the invention
The object of the present invention is to provide it is a kind of overcome the above problem purification nitrogen oxides composition and its application method,
Using said composition energy deep purifying nitrogen oxides, purifying rate is up to more than 88%, and required equipment is simply at low cost, is more suitable for
NO in purification diesel engine emissionX。
The technical solution adopted by the present invention is as follows：
A kind of composition for purifying nitrogen oxides, including the water-soluble of sodium chlorite aqueous solution, catalytic ceramics ball and reducing agent
Liquid, the catalytic ceramics ball are attached on filler porcelain ball by catalyst and are formed.
Above-mentioned technical proposal uses sodium chlorite aqueous solution under catalytic ceramics ball existence condition, by the NO in nitrogen oxides
It is fully oxidized to NO2, the aqueous solution of reducing agent is recycled by NO2Reduction generation N2, wherein sodium chlorite and NO reaction process be such as
Under：
NaClO2+2NO→2NO2+NaCl
Control series of parameters only by NO partial oxidations in the prior art, and the present invention is whole by NO by catalytic ceramics ball
Oxidation, makes subsequent reactions more single, easily controllable, and reaction more fully makes purifying rate higher.
Preferably, the mass fraction of the sodium chlorite is 4%~6%.By the mass fraction control of sodium chlorite herein
In the range of, purifying rate higher.
Preferably, the reducing agent be sodium sulfite, mass fraction 20%.The by-product of generation has other purposes,
Reduce the probability for causing secondary pollution.Reaction equation is as follows：
2NO2+4Na2SO3→4Na2SO4+N2↑
The reaction condition is simple, and the nitrogen of generation is nontoxic to be directly discharged in air, and the sodium sulphate of generation can be used for making
Make waterglass, glass, enamel, paper pulp and drier etc..
Preferably, catalyst is one kind in copper nitrate, ferric nitrate and cerous nitrate in the catalytic ceramics ball.
Preferably, the filler porcelain ball is inert alumina porcelain ball, and opens up groove in spherome surface.Inert alumina porcelain
Ball high temperature high voltage resistant, water absorption rate is low, stable chemical performance, is amenable to the corrosion of acid, alkali and other organic solvents, and is amenable to give birth to
Produce the temperature change occurred in the process.Groove is opened up in spherome surface, adds the specific surface area of sphere, so as to further increase
The dispersiveness of material, while also increase gas or liquid distribution point, support and guard catalyst.But it is not that specific surface area is got over
Big better, so micropore or Pored ceramic ball should not be selected, otherwise flux is excessive, and system resistance is too small, and reaction can be too violent, uneasy
Entirely.
Preferably, the material of the inert alumina porcelain ball be corundum, a diameter of 8-13mm.The inertia oxidation of corundum
Aluminium porcelain ball high temperature resistant and corrosion resistance are stronger, and when selecting diameter, too small compression strength is inadequate, and being unfavorable for ball milling makes catalyst attached
It, is unfavorable for very much catalyst greatly and uniformly disperses, therefore select a diameter of 8-13mm.
In above-mentioned technical proposal, the preparation method of catalytic ceramics ball includes：It is 1 by mass ratio:3.5~5 catalyst and
Inert alumina porcelain ball is placed in ball grinder, adds in the water of 1/4 catalyst weight part, and catalyst is attached to by ball milling 5-10min
It on inert alumina porcelain ball, is then sintered at 400 DEG C, catalytic ceramics ball is made.
Above-mentioned preparation method is simple to operation, and the appropriate proportioning of catalyst and inert alumina porcelain ball makes catalyst more uniform
Ground is distributed in the groove of sphere, again catalyst is made to be connected as a single entity with sphere through oversintering, is added the diffusional area of catalyst.
Preferably, the mass ratio of the aqueous solution three of the sodium chlorite aqueous solution, catalytic ceramics ball and reducing agent are 1:
1-1.5:1, it is preferably 1:1.2:1.In this ratio range, catalytic effect is best, can make NO all oxidation and will not
Excessively acutely and there are security risks.
The present invention also provides the application method of the composition of above-mentioned purification nitrogen oxides, including first that sodium chlorite is water-soluble
Liquid mist chemical conversion fine drop covers and passes through catalytic ceramics ball, forms adverse current with the gas of nitrogen-containing oxide, sodium chlorite will contain
NO oxidation generations NO in oxides of nitrogen gas2, then by the oxides of nitrogen gas after oxidation be passed through in the aqueous solution of reducing agent into
Row reaction generation N2, so as to fulfill purification nitrogen oxides.
In above-mentioned technical proposal by sodium chlorite aqueous solution be atomized into fine drop cover and pass through catalytic ceramics ball and with
The gas of nitrogen-containing oxide forms adverse current in order to increase haptoreaction area, and it is abundant to be conducive to reaction.
In a specific embodiment, the gas of nitrogen-containing oxide of the invention is the tail gas of diesel emission.
The present invention has the advantage that compared with the prior art：
The composition collocation of the present invention is reasonable, first with Oxygen in Liquid agent sodium chlorite solution in the presence of a catalyst, by nitrogen
All oxidation generates NO to NO in oxide2, the aqueous solution containing reducing agent is recycled by NO2Reduction generation N2, the reaction was complete easily grasps
Control, purifying rate is up to more than 88%, and required equipment is simply at low cost, can be suitable for the urea liquid on diesel oil substitute vehicle
NO in deep purifying diesel emission tail gasX。
Specific embodiment
With reference to specific embodiment, the specific embodiment of the present invention is described in further detail.Following embodiment
For illustrating the present invention, but it is not limited to the scope of the present invention.
Embodiment 1
A kind of composition for purifying nitrogen oxides is present embodiments provided, including the sodium chlorite water that mass fraction is 4%
Solution, copper nitrate catalytic ceramics ball and 20% sodium sulfite aqueous solution.Wherein described copper nitrate catalytic ceramics ball is by copper nitrate
It is attached on inert alumina porcelain ball and is formed, its preparation method includes：By the copper nitrate of 20 parts by weight and the inertia of 100 parts by weight
Alumina ball is placed in ball grinder, adds in the water of 5 parts by weight, and copper nitrate is attached to inert alumina porcelain ball by ball milling 5min
On, it is then sintered at 400 DEG C, is made copper nitrate catalytic ceramics ball, the inert alumina porcelain ball is corundum, spherome surface
Open up groove, a diameter of 8mm.
The present embodiment additionally provides the application method of above-mentioned composition, including：First 100 parts by weight sodium chlorite solutions are noted
Enter in catalytic oxidizing equipment；120 parts by weight copper nitrate catalytic ceramics balls are placed in sodium chlorite solution in catalytic oxidizing equipment
Top；100 parts by weight sodium sulfite aqueous solutions are injected in absorption plant；
Diesel emission tail gas is passed through catalytic oxidizing equipment bottom again, sodium chlorite solution is atomized by spray system
Fine drop covers the sectional layer of entire catalytic oxidizing equipment, forms adverse current by copper nitrate catalytic ceramics ball and with tail gas, fills
Tap is touched, and the NO in tail gas is catalytically oxidized to NO by sodium chlorite solution2, absorption plant is then passed through again, it is molten with sodium sulfite
Liquid is reacted NO2It is reduced into N2.After this method is handled, the purifying rate of diesel emission nitrogen oxide in tail gas is up to 91%.
Based on embodiment 1, just " mass fraction of sodium chlorite " does parallel laboratory test, and the results are shown in Table 1.
Influence of the mass fraction of 1 sodium chlorite of table to purifying rate
| The mass fraction of sodium chlorite | 0.1% | 1% | 2% | 4% | 6% | 8% | 10% |
| Purifying rate | 81% | 86% | 88% | 91% | 90% | 87% | 83% |
Embodiment 2
A kind of composition for purifying nitrogen oxides is present embodiments provided, including the sodium chlorite water that mass fraction is 6%
Solution, cerous nitrate catalytic ceramics ball and 20% calcium sulfite aqueous solution.Wherein described cerous nitrate catalytic ceramics ball is by cerous nitrate
It is attached on inert alumina porcelain ball and is formed, its preparation method includes：By the cerous nitrate of 20 parts by weight and the inertia of 75 parts by weight
Alumina ball is placed in ball grinder, adds in the water of 5 parts by weight, and cerous nitrate is attached to inert alumina porcelain ball by ball milling 10min
On, it is then sintered at 400 DEG C, is made cerous nitrate catalytic ceramics ball, the inert alumina porcelain ball is corundum, spherome surface
Open up groove, a diameter of 13mm.
The present embodiment additionally provides the application method of above-mentioned composition, including：First 100 parts by weight sodium chlorite solutions are noted
Enter in catalytic oxidizing equipment；110 parts by weight of cerium nitrate catalytic ceramics balls are placed in sodium chlorite solution in catalytic oxidizing equipment
Top；100 parts by weight sodium sulfite aqueous solutions are injected in absorption plant；
Diesel emission tail gas is passed through catalytic oxidizing equipment bottom again, sodium chlorite solution is atomized by spray system
Fine drop covers the sectional layer of entire catalytic oxidizing equipment, forms adverse current by cerous nitrate catalytic ceramics ball and with tail gas, fills
Tap is touched, and the NO in tail gas is catalytically oxidized to NO by sodium chlorite solution2, absorption plant is then passed through again, it is molten with calcium sulfite
Liquid is reacted NO2It is reduced into N2.After this method is handled, the purifying rate of diesel emission nitrogen oxide in tail gas is up to 88%.
Comparative example 1
Remaining is same as Example 1, the difference is that the composition of the comparative example does not include catalytic ceramics ball.Last diesel engine
The purifying rate of nitrogen oxides is 78% in emission.
Comparative example 2
Remaining is same as Example 1, the difference is that catalytic ceramics ball is not made for copper nitrate in the comparative example, but directly puts
In the sectional layer of catalytic oxidizing equipment.The purifying rate of last diesel emission nitrogen oxide in tail gas is 80%.
Comparative example 3
Remaining is same as Example 1, the difference is that sodium chlorite aqueous solution, copper nitrate catalytic ceramics ball and sodium sulfite water
The weight part ratio of solution three is 1:0.8:1.The purifying rate of last diesel emission nitrogen oxide in tail gas is 82%.
Finally, method of the invention is only preferable embodiment, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modifications, equivalent replacements and improvements are made should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of composition for purifying nitrogen oxides, which is characterized in that including sodium chlorite aqueous solution, catalytic ceramics ball and reduction
The aqueous solution of agent, the catalytic ceramics ball are attached on filler porcelain ball by catalyst and are formed.
A kind of 2. composition for purifying nitrogen oxides according to claim 1, which is characterized in that the matter of the sodium chlorite
It is 4%~6% to measure fraction.
3. a kind of composition for purifying nitrogen oxides according to claim 1, which is characterized in that the reducing agent is sulfurous
Sour sodium, mass fraction 20%.
4. a kind of composition for purifying nitrogen oxides according to claim 1, which is characterized in that the catalyst is nitric acid
One kind in copper, ferric nitrate and cerous nitrate.
5. a kind of composition for purifying nitrogen oxides according to claim 1, which is characterized in that the filler porcelain ball is lazy
Property alumina ball, and open up groove in spherome surface.
A kind of 6. composition for purifying nitrogen oxides according to claim 5, which is characterized in that the inert alumina porcelain
The material of ball be corundum, a diameter of 8-13mm.
7. a kind of composition for purifying nitrogen oxides according to claim 6, which is characterized in that the catalytic ceramics ball
Preparation method includes：It is 1 by mass ratio:3.5~5 catalyst and inert alumina porcelain ball is placed in ball grinder, is added in 1/4 and is urged
Catalyst is attached on inert alumina porcelain ball by the water of agent parts by weight, ball milling, and catalytic ceramics ball is made in sintering.
8. a kind of composition for purifying nitrogen oxides according to claim 7, which is characterized in that the sodium chlorite is water-soluble
The mass ratio of the aqueous solution three of liquid, catalytic ceramics ball and reducing agent is 1:1-1.5:1, it is preferably 1:1.2:1.
9. a kind of application method of the composition of purification nitrogen oxides any one of claim 1-8, which is characterized in that
It covers including sodium chlorite aqueous solution first is atomized into fine drop and passes through catalytic ceramics ball, the gas shape with nitrogen-containing oxide
Into adverse current, the NO oxidations in gas containing nitrogen oxide are generated NO by sodium chlorite2, then the oxides of nitrogen gas after oxidation is passed through
Reaction generation N is carried out in the aqueous solution of reducing agent2, so as to fulfill purification nitrogen oxides.
10. the application method of a kind of composition for purifying nitrogen oxides according to claim 9, which is characterized in that described
The gas of nitrogen-containing oxide is the tail gas of diesel emission.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108744934A (en) * | 2018-06-25 | 2018-11-06 | 山东首丰环保设备有限公司 | A kind of method of redox denitration |
| CN111760564A (en) * | 2020-06-17 | 2020-10-13 | 河北深思新材料技术有限公司 | Catalyst for urea hydrolysis and preparation method and application thereof |
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| JP2003170025A (en) * | 2001-12-11 | 2003-06-17 | Mitsubishi Kakoki Kaisha Ltd | Method for removing nitrogen oxides in exhaust gas and equipment therefor |
| CN1658952A (en) * | 2002-06-05 | 2005-08-24 | 埃克森美孚研究工程公司 | Process for reducing NOx in waste gas streams using chlorine dioxide |
| CN101279185A (en) * | 2007-12-29 | 2008-10-08 | 浙江工业大学 | Gas phase oxidation-liquid phase reduction method for absorbing and removing nitrous oxides in exhaust air |
| CN103203166A (en) * | 2012-01-12 | 2013-07-17 | 北京化工大学 | Technology for efficiently removing NOx pollutants in smoke |
| CN106943871A (en) * | 2017-03-09 | 2017-07-14 | 华北电力大学 | A kind of method that low temperature class catalytic gas phase oxidation removes flue gas multiple pollutant |
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2017
- 2017-12-18 CN CN201711366974.1A patent/CN108114596B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003170025A (en) * | 2001-12-11 | 2003-06-17 | Mitsubishi Kakoki Kaisha Ltd | Method for removing nitrogen oxides in exhaust gas and equipment therefor |
| CN1658952A (en) * | 2002-06-05 | 2005-08-24 | 埃克森美孚研究工程公司 | Process for reducing NOx in waste gas streams using chlorine dioxide |
| CN101279185A (en) * | 2007-12-29 | 2008-10-08 | 浙江工业大学 | Gas phase oxidation-liquid phase reduction method for absorbing and removing nitrous oxides in exhaust air |
| CN103203166A (en) * | 2012-01-12 | 2013-07-17 | 北京化工大学 | Technology for efficiently removing NOx pollutants in smoke |
| CN106943871A (en) * | 2017-03-09 | 2017-07-14 | 华北电力大学 | A kind of method that low temperature class catalytic gas phase oxidation removes flue gas multiple pollutant |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108744934A (en) * | 2018-06-25 | 2018-11-06 | 山东首丰环保设备有限公司 | A kind of method of redox denitration |
| CN111760564A (en) * | 2020-06-17 | 2020-10-13 | 河北深思新材料技术有限公司 | Catalyst for urea hydrolysis and preparation method and application thereof |
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