CN1486775A - NO eliminating method for surface adsorbing low-energy state plasma - Google Patents
NO eliminating method for surface adsorbing low-energy state plasma Download PDFInfo
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- CN1486775A CN1486775A CNA021383952A CN02138395A CN1486775A CN 1486775 A CN1486775 A CN 1486775A CN A021383952 A CNA021383952 A CN A021383952A CN 02138395 A CN02138395 A CN 02138395A CN 1486775 A CN1486775 A CN 1486775A
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- nitrogen
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- nitric oxide
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Abstract
The NO eliminating method includes adding N2 into gas containing NO via stirring, and making the gas mixture pass through high frequency and high voltage electric field of voltage peak value not lower than 3000 V and pulse voltage frequency not lower than 500 Hz. While passing through the electric field, N2 is adsorbed chemically to the surface of solid particle to form active nitrogen atom via gas discharge, the active nitrogen atom combines with NO to form N2, and NO is eliminate. During the process, ionizing N2 to form active nitrogen atom needs only low energy and ionizing N2 adsorbed onto the surface of solid particle needs only ever lower energy, so that the energy essential for eliminating NO is lowered effectively.
Description
The technical field is as follows:
the invention relates to a gas denitration method, in particular to a method for removing surface adsorption low-energy-state plasma nitric oxide.
Secondly, background art:
in recent years, the technology of removing nitric oxide by plasma has attracted more and more attention. Compared with the traditional method for removing the nitric oxide, the method for removing the nitric oxide from the plasma flue gas is a novel method with high efficiency and low cost, and has the incomparable advantages of investment saving, small device volume, simple operation, high-quality chemical fertilizer serving as a product and the like. It is the most promising new generation of removal one recognized internationallyThe nitrogen oxide technology generates plasma through pulse discharge or other forms, and the plasma contains a large amount of high-energy electrons, ions, excited-state particles and free radicals with strong oxidizing property. The result of the collision of these active particles with nitric oxide molecules: or opening a nitric oxide molecular bond under the condition of extremely high energy to generate nitrogen and oxygen; or generate a large amount of OH and HO2And O, which oxidize the nitric oxide molecule and finally form an ammonia salt in the presence of the ammonia molecule. However, these methods have inevitable disadvantages such as high energy consumption, and the like, and the conventional methods involve passing a contaminated gas containing nitric oxide through a high-frequency high-pressure gas of 20 ten thousand volts or more, or directly decomposing nitric oxide into nitrogen and oxygen, or decomposing oxygen into active oxygen atoms by gas discharge to oxidize nitric oxide into nitrogen dioxide, and then introducing steam and ammonia to convert nitric oxide into an ammonium salt.
Thirdly, the invention content:
the technical problem is as follows: the invention provides a method for removing nitrogen monoxide from surface-adsorbed low-energy-state plasma, which can reduce energy consumption.
The technical scheme is as follows: a method for removing nitrogen monoxide from gas containing nitrogen monoxide by surface adsorption low-energy plasma comprises adding nitrogen into the gas containing nitrogen monoxide, mixing, and passing through a high-frequency high-voltage electric field with peak voltage not lower than 3000V and pulse voltage frequency not lower than 500 Hz, wherein the nitrogen is chemically adsorbed on the surface by solid particles arranged in the electric field when passing through the electric field, and active nitrogen atoms are formed by gas discharge and combined with nitrogen monoxide to form nitrogen, thus completing the removal of nitrogen monoxide.
① As the invention makes the mixed gas containing nitrogen monoxide and nitrogen pass through the electric field, the solid particles in the electric field selectively chemisorb nitrogen and form gas discharge on the surface to generate active nitrogen atoms to form nitrogen (the elementary reaction is And ) Thereby to make② because the invention selects metal oxide particles, such as alumina, copper oxide, calcium oxide or zeolite, to pass ions on the particles③ the present invention introduces an electric field after mixing nitric oxide and nitrogen at a flow ratio of no less than 10: 1 has the advantages of enabling nitrogen to wrap the surface of solid particles, thereby enabling the nitric oxide to react sufficiently, facilitating the complete removal of nitric oxide. ④ the solid particles are defined as spherical or massive particles and have a linear dimension of 2-3 mm, the advantage of enabling the mixed gas to pass through smoothly by utilizing the gaps between the particles, facilitating the complete removal of nitric oxide, the diameter of the particles represents the specific surface area of the particles (the specific surface area is the surface area of the particles per unit mass), the larger the specific surface area, the more gas the particles can adsorb, the smaller the particle diameter, the smaller the gaps between the particles are too small, the particles are not favorable for gas to pass through, the larger the particle diameter is not favorable for the surface area, the adsorbing is not favorable for the adsorption of nitric oxide, the present invention enables the gas containing nitric oxide to stay in the high-frequency high-voltage electric field for more than 10-4And in seconds, the nitric oxide can be removed more effectively.
Fourth, detailed description of the invention
A method for removing nitrogen monoxide from gas by surface adsorption and low-energy plasma method includes passing gas containing nitrogen monoxide through high-frequency high-voltage electric field with peak voltage not lower than 3000V and pulse voltage frequency not lower than 500 Hz, selecting electric field with peak voltage not lower than 15000V and pulse voltage frequency not lower than 30000 Hz, adsorbing nitrogen monoxide on the surface by solid particles in electric field, and discharging gas to form active nitrogen atomsThe solid particles are firstly metal oxide particles, which can be calcium oxide, aluminum oxide, oxide or zeolite, if no nitrogen exists in the gas containing nitric oxide or nitrogen is beneficial to removing nitric oxide, nitrogen is added into the gas containing nitric oxide and mixed, the flow ratio of nitric oxide and nitrogen is not less than 10: 1, active nitrogen atom plasma is formed on the surface of the solid particles after discharge, the solidparticles can be spherical and filled in an electric field, the diameter of the spherical solid particles is 2-3 mm, the spherical solid particles can also be massive and filled in the electric field, the length of the massive solid particles is 2-3 mm, in the embodiment, the time of the nitric oxide-containing gas staying in the electric field is not less than 10%-4And second.
Claims (6)
1. A method for removing nitrogen monoxide from gas containing nitrogen monoxide by surface adsorption and low-energy plasma is characterized in that nitrogen is added and mixed in the gas containing nitrogen monoxide, the gas containing nitrogen monoxide passes through a high-frequency high-voltage electric field, the peak voltage of the high-frequency high-voltage electric field is not lower than 3000 volts, the pulse voltage frequency is not lower than 500 Hz, the nitrogen is chemically adsorbed on the surface of the nitrogen by solid particles arranged in the electric field when passing through the electric field, active nitrogen atoms are formed by gas discharge, and the active nitrogen atoms and the nitrogen monoxide are combined to form the nitrogen, so that the removal of the nitrogen monoxide can be completed.
2. The method according to claim 1, wherein the flow ratio of nitric oxide to nitrogen is not less than 10: 1.
3. The method for removing nitric oxide by using surface adsorption low-energy-state plasma as claimed in claim 1 or 2, wherein the solid particles are spherical and filled in the electric field, and the diameter of the spherical solid particles is 2-3 mm.
4. The method for removing nitric oxide by using surface adsorption low-energy-state plasma as claimed in claim 1 or 2, wherein the solid particles are massive and filled in the electric field, and the length of the massive solid particles is 2-3 mm.
5. The method according to claim 1 or 2, wherein the nitric oxide-containing gas is retained in the electric field for a period of time not less than 10%-4And second.
6. The method for removing nitric oxide by using surface adsorption low-energy-state plasma as claimed in claim 1 or 2, wherein the solid particles are metal oxide particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138395 CN1212174C (en) | 2002-09-30 | 2002-09-30 | NO eliminating method for surface adsorbing low-energy state plasma |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138395 CN1212174C (en) | 2002-09-30 | 2002-09-30 | NO eliminating method for surface adsorbing low-energy state plasma |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1486775A true CN1486775A (en) | 2004-04-07 |
| CN1212174C CN1212174C (en) | 2005-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02138395 Expired - Fee Related CN1212174C (en) | 2002-09-30 | 2002-09-30 | NO eliminating method for surface adsorbing low-energy state plasma |
Country Status (1)
| Country | Link |
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| CN (1) | CN1212174C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879566A (en) * | 2016-05-28 | 2016-08-24 | 复旦大学 | Method and device for removing NOx in flue gas by induced reduction of dielectric barrier discharge |
-
2002
- 2002-09-30 CN CN 02138395 patent/CN1212174C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879566A (en) * | 2016-05-28 | 2016-08-24 | 复旦大学 | Method and device for removing NOx in flue gas by induced reduction of dielectric barrier discharge |
| CN105879566B (en) * | 2016-05-28 | 2019-04-05 | 复旦大学 | NO in the medium barrier discharging induced reduction removing flue gas of one kindxMethod and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1212174C (en) | 2005-07-27 |
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Granted publication date: 20050727 Termination date: 20100930 |