CN1162209C - Method for removing NOx from airflow - Google Patents
Method for removing NOx from airflow Download PDFInfo
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- CN1162209C CN1162209C CNB011215097A CN01121509A CN1162209C CN 1162209 C CN1162209 C CN 1162209C CN B011215097 A CNB011215097 A CN B011215097A CN 01121509 A CN01121509 A CN 01121509A CN 1162209 C CN1162209 C CN 1162209C
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- corona discharge
- solid absorbent
- reaction
- absorbs
- nox
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Abstract
The present invention relates to a chemical reaction absorption method formed by combining corona discharge and solid absorbing agents, which is used for purifying NOx generated in the combustion and production processes of fuel. In the treatment process of the method, gas containing NOx is led in a reaction absorber composed of corona discharge and solid absorbing agents, NO is oxidized into NO2 under the action of corona discharge plasma and is subsequently absorbed by the solid absorbing agents placed in a reactor, and absorbing agents saturated through absorption are regenerated through desorption reaction. The present invention has the advantages of high removal rate and no generation of waste liquid and waste water, and is suitable for popularization.
Description
The present invention relates to be used for removing the method that various production process air-flows contain nitrogen oxide NOx, more specifically relates to remove the NOx purification method that contains in the waste gas with the mode of corona discharge and solid absorbent associating.
Nitrogen oxide NOx mainly comprises NO and NO
2Result from fuel and burn and various process of manufacture, a large amount of discharged nitrous oxides is the one of the main reasons that causes atmospheric photochemistry mist and acid rain.
Usually, at present the NOx main method of administering has two kinds of dry method and wet methods.Wherein the catalytic reduction method as dry method is one of main means of handling at present exhaust combustion gases, but catalyst has relatively high expectations to service condition, and investment and running expense are higher, are not suitable for the application in discharged at lower temperature source; Wet method is to adopt various liquid that NOx is absorbed, but to containing the more NOx of NO, its treatment effeciency is low, and waste liquid needs after-treatment.
The nonequilibrium plasma technology that is produced by pulsed discharge and voltolising etc. obtains various countries researcher's broad research in recent years as a kind of novel NOx waste gas pollution control and treatment technology.Discover the oxidation and the reduction reaction that can realize NOx with the nonequilibrium plasma technology.Generally main generation oxidation reaction in the presence of the oxidant is being arranged, and reduction reaction is mainly taking place in the presence of reducing agent.But, therefore when handling real gas, must unite use with additive method because the non-equilibrium plasma chemical reaction is restive.Yang etc. are at Environmental Progress 17 (3): 183-189, and 1998, reported the employing two-part, promptly earlier make the NO among the NOx be oxidized to NO through the non-equilibrium plasma reactor
2After, absorb by absorber again, to solve with liquid absorption method containing the more lower problem of NOx treatment effeciency of NO.Though this method has overcome the problem that NO is difficult to absorb, its technology is still complicated.Also there is report to adopt IEEE-LAS Transac-tions 31 (6): 1463-1467 such as moisture film discharge reactor such as Mizuno A, 1995, but the difficulty that the practical application of this method faces is because the steaming method of water causes energy consumption very big, and processed gas temperature can not be above 100 ℃ of after-treatment problems with water.
The objective of the invention is to be to design and the method for a kind of nonequilibrium plasma technology in conjunction with chemical reaction absorbs is provided, is to adopt the method for corona discharge and solid absorbent associating to overcome above-mentioned problem with nonequilibrium plasma technical finesse NOx.
Content of the present invention is to be to be provided for NOx purification method in the air-flow, it is characterized in that air communication crosses reacting sucting collector, described reacting sucting collector is the reacting sucting collector by corona discharge and solid absorbent associating one, wherein the electrode surface between two required electrodes of corona discharge partly or entirely is coated with certain thickness porous absorption material material, make the space of processed gas, make the NO in the air-flow under the corona discharge effect, be oxidized to NO by forming by absorbing material surface and another sparking electrode
2, the NO that is generated
2The solid absorbent that is installed in the reactor absorbs, and absorbs thereby reach gas purification.
Can utilize again by heating desorption reaction back regeneration after above-mentioned solid absorbent absorption is saturated.
The key reaction of absorption process is with Mg (OH)
2As absorbent is example:
The key reaction of desorption process is 250～350 ℃ of scopes:
The version of corona discharge reacting sucting collector of the present invention can be line-tube, line-board-like and pin-board-like, and electrode material comprises that the distance of common conductive material, two electrodes is 5～100mm.
The power supply mode of corona discharge that the present invention adopts comprises and exchanging and pulse that wherein the voltage of Alternating Current Power Supply is that 2～100KV, frequency are 20～50KHz: the voltage of pulse power supply for ± 2K～± 150KV, pulse recurrence frequency is 10～2KHz.Better with the pulse power supply effect.
Corona discharge the reacting sucting collector of the present invention interior oxide that comprises calcium or magnesium, hydroxide or carbonate as solid absorbent.Be good with hydroxide and oxide wherein, the performance of the absorbent of two kinds of metals is suitable in the removal effect of gas flow temperature during less than 100 ℃.But regeneration temperature difference, calcium are 500-600 ℃, and magnesium is 250-350 ℃.The oxide that also can in absorber material, add the monobasic of mass content 0.5-10% or polynary transition metal with catalytic activity such as vanadium, titanium, manganese, chromium, copper, nickel, titanium or iron in addition as auxiliary material to strengthen reaction.When reaction temperature during at 80-100 ℃, on average have an appointment 10% raising of clearance, the material of relevant catalyst can list of references Hans Bosch and Frans Janssen, Catalysis Today, 1988,2 (4): 369-521.The carrier material of absorbent can be an aluminium oxide.
The combination of solid absorbent and electrode can be to assemble after direct application moulding and the moulding in advance, and radially the absorbent height is generally 1～50mm, and visual response device size and payload are set.The operating temperature of corona discharge reacting sucting collector reactor can be room temperature～200 ℃, generally to be advisable less than 100 ℃.The time of staying of gas in reactor is 2～5s.
The absorbent desorption and regeneration is inhaled the regeneration of reaction back by absorbent being heated take off, and the mode of heating can be to use heating wire heating and the thermal current heating that is contained in the reactor.Desorption temperature is looked the absorbent difference of employing and is changed.Desorb can be carried out in nitrogen and/or air, and the NOx after the recyclable desorb also can add reducing gas in nitrogen, and as ammonia and lighter hydrocarbons etc., the gas reduction after corona discharge or catalyst exist following to take off suction is a nitrogen.
Device can and compose in parallel alternation by a plurality of series connection of above-mentioned reacting sucting collector.
Advantage of the present invention and good effect: adopt the mode of corona discharge and solid absorbent combination, make NO under the corona discharge effect, be oxidized to NO
2, be installed in on-the-spot absorption of this porous absorption material material in the reactor simultaneously, thereby the guiding reaction is towards generating NO
2Direction carry out, prevented NO
2Under corona, be decomposed into the possibility of NO again.Thereby improved reaction efficiency, and then improved efficiency of energy utilization.Simultaneously solid absorbent has also obtained enhancing to the absorption process of NO2 under the corona discharge effect, and reaction is carried out fully.Experimental result shows, adopts corona discharge absorption reactor thermally structure than the corona reactor that adopts no absorbent under the same conditions, and the clearance of NOx has improved 40～70%; Promptly earlier through corona discharge, the back absorbs with same solid absorbent Solid Bed than two-part, and the clearance of NOx has improved 30～40%.
Description of drawings:
Fig. 1 is a kind of line-cartridge type corona discharge absorption reactor thermally structure chart.
Below in conjunction with accompanying drawing embodiments of the invention are further described:
Embodiment 1, experimental provision adopts line-cartridge type corona discharge absorption reactor thermally shown in Figure 1, and its label is: 1, air inlet, 2, the corona electrode lead-out wire connects power end, 3, insulator, 4, adpting flange, 5, corona wire electrode, 6, cylindrical shell double as electrode, 7, porous is inhaled material, 8, heating wire, 9, adpting flange, 10, exhaust outlet.The tube internal diameter is that the absorber thickness of 26mm, tube inwall is about 2mm, directly is coated with the surface that is contained in an electrode inner wall by the slurries of magnesium hydroxide, at 110 ℃ of following drying formings.Corona electrode adopts the 0.5mm stainless steel wire, and the length of effectively discharging is 250mm.Power supply adopts rotary arrester switch type positive pulse power supply.
Experiment condition is: power parameter: pulse voltage 22KV, pulse frequency 60Hz, power 18W
Gas flow: 2000ml/min
Gas componant: N
2.75%; O
212%; H
2O 8%; CO
24%
Experimental result: absorption process
Table 1
| Gas temperature ℃ | NO inlet concentration ppm | Clearance |
| 30 | 500 | 99％ |
| 80 | 500 | 91％ |
Embodiment 2, and the slurries of being made up of magnesium hydroxide 95% and vanadic anhydride 5% mass percent directly are coated with and are contained in an electrode inner wall surface, at 110 ℃ of following drying formings.Other conditions such as embodiment 1.Experimental result meaning as shown in table 2.
Table 2
| Gas temperature ℃ | NO inlet concentration ppm | Clearance |
| 30 | 500 | 99％ |
| 80 | 500 | 94％ |
Embodiment 3, and the slurries of being made up of calcium hydroxide 97% and cupric oxide 3% mass percent directly are coated with and are contained in an electrode inner wall surface, at 110 ℃ of following drying formings.Other conditions such as embodiment 1.Experimental result meaning as shown in table 3.
Table 3
| Gas temperature ℃ | NO inlet concentration ppm | Clearance |
| 30 | 800 | 97％ |
| 80 | 800 | 92％ |
Embodiment 4, directly are coated with by the slurries of calcium carbonate 100% and are contained in an electrode inner wall surface, at 110 ℃ of following drying formings.Other conditions such as embodiment 1.Experimental result meaning as shown in table 4.
Table 4
| Gas temperature ℃ | NO inlet concentration ppm | Clearance |
| 30 | 500 | 83％ |
| 80 | 500 | 71％ |
Embodiment 5, directly are coated with by the slurries of calcium carbonate 93% and manganese dioxide 7% and are contained in an electrode inner wall surface, at 110 ℃ of roars of laughter dry formings down.Other conditions such as embodiment 1.Experimental result meaning as shown in table 5.
Table 5
| Gas temperature ℃ | NO inlet concentration ppm | Clearance |
| 30 | 500 | 84％ |
| 80 | 500 | 76％ |
Embodiment 6, gas componant: NO 500ppm, all the other N
2, other conditions such as embodiment 1.
Table 6
| Gas temperature ℃ | NO inlet concentration ppm | Clearance |
| 30 | 500 | 88％ |
| 80 | 500 | 78％ |
Embodiment 7, gas componant: NO 500ppm, O
25%, all the other N
2Other conditions such as embodiment 1.
Table 7
| Gas temperature ℃ | NO inlet concentration ppm | Clearance |
| 30 | 500 | 97％ |
| 80 | 500 | 88％ |
Embodiment 8, and experiment condition is: power supply is an AC power, voltage 20KV, frequency 100Hz, power 20W, other conditions such as embodiment 1.
Table 8
| Gas temperature ℃ | NO inlet concentration ppm | Clearance |
| 30 | 500 | 86％ |
| 80 | 500 | 79％ |
Claims (5)
1. method of from air-flow, removing NOx, it is characterized in that air communication crosses reacting sucting collector, described reacting sucting collector is the reacting sucting collector by corona discharge and solid absorbent associating one, wherein the electrode surface between two required electrodes of corona discharge partly or entirely is coated with certain thickness porous absorption material material, make the space of processed gas, make the NO in the air-flow under the corona discharge effect, be oxidized to NO by forming by absorbing material surface and another sparking electrode
2, the NO that is generated
2The solid absorbent that is installed in the reactor absorbs, and absorbs thereby reach gas purification.
2. method according to claim 1 is characterized in that solid absorbent absorbs saturated back by heating desorption reaction back regeneration.
3. method according to claim 1 is characterized in that the method for supplying power to of corona discharge comprises interchange and pulse.
4. method according to claim 1 is characterized in that solid absorbent comprises oxide, hydroxide or the carbonate of calcium or magnesium.
5. method according to claim 4, the oxide that it is characterized in that can adding in the solid absorbent a certain amount of monobasic or polynary transition metal with catalytic activity such as vanadium, titanium, manganese, chromium, copper, nickel, titanium or iron as auxiliary material to strengthen reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011215097A CN1162209C (en) | 2000-06-08 | 2001-06-05 | Method for removing NOx from airflow |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00116408 CN1275425A (en) | 2000-06-08 | 2000-06-08 | Method for purifying waste gas containing NOx |
| CN00116408.2 | 2000-06-08 | ||
| CNB011215097A CN1162209C (en) | 2000-06-08 | 2001-06-05 | Method for removing NOx from airflow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1332030A CN1332030A (en) | 2002-01-23 |
| CN1162209C true CN1162209C (en) | 2004-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011215097A Expired - Fee Related CN1162209C (en) | 2000-06-08 | 2001-06-05 | Method for removing NOx from airflow |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101810990B (en) * | 2009-12-31 | 2012-09-12 | 北京航空航天大学 | Method for efficiently removing NOx in fume |
| CN101856585B (en) * | 2010-06-29 | 2012-12-26 | 黄立维 | Device for removing harmful gas from airflow |
| CN101856586B (en) * | 2010-06-29 | 2012-12-26 | 黄立维 | Device for removing nitric oxide from airflow |
| CN105797571A (en) * | 2016-03-18 | 2016-07-27 | 浙江工业大学 | Nitrogen oxide removing device and method for removing nitrogen oxide in air flow thereof |
| CN112791569A (en) * | 2021-03-09 | 2021-05-14 | 昆明理工大学 | Method for purifying acid gas by electrochemical synergistic microemulsion |
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2001
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| CN1332030A (en) | 2002-01-23 |
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