CN102407073B - Denitration method for two-section microwave catalytic reaction bed - Google Patents
Denitration method for two-section microwave catalytic reaction bed Download PDFInfo
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- CN102407073B CN102407073B CN2011104512185A CN201110451218A CN102407073B CN 102407073 B CN102407073 B CN 102407073B CN 2011104512185 A CN2011104512185 A CN 2011104512185A CN 201110451218 A CN201110451218 A CN 201110451218A CN 102407073 B CN102407073 B CN 102407073B
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Abstract
The invention relates to a denitration method for a two-section microwave catalytic reaction bed. The method comprises the following steps: filling a catalyst in a reaction tube of a microwave catalytic reactor device, thereby forming a microwave catalytic reaction bed, and then generating a gas-solid reaction by use of a processed gas while passing by the microwave catalytic reaction bed, thereby performing the denitration treatment. The microwave catalytic reaction bed is composed of two independent microwave catalytic reaction beds which are mutually connected in series; Cu-HZSM-5 or Mn/MgFe2O4 catalyst is taken as the catalyst in a first section microwave catalytic reaction bed; activated carbon or activated carbon loaded MnO, CuO or CeO-CuO, MgO-FeOx, CeO-ZrO2 catalyst is taken as the catalyst in a second section microwave catalytic reaction bed; and the processed gas passes by the first and second section microwave catalytic reaction beds in turn and is subjected to a direct decomposition reaction and a selective reduction reaction in turn, thereby removing the nitric oxide. The denitration method has the advantages of being free from secondary pollution and corrosion, high in conversion rate, small in energy consumption, energy-saving, environmentally-friendly, low in running cost, and the like.
Description
Technical field
The present invention relates to a kind of two sections microwave catalysis reaction bed method of denitration.
Background technology
Nitrogen oxide NO
xHealth and ecological environment are all caused very big harm, how to have taked efficient denitrification, eliminated NO
xPollute the important topic that has become in environmental protection.The technology of present industrial application is the SCR technology (NH take ammonia as reducing agent
3-SCR), this technology is that the Environmental Protection in China cause has been made positive contribution.NH
3-SCR method is one of method the most ripe in existing nitrogen oxide treatment technology, and the method can make the removal of nitrogen oxide rate reach 80～90% at lower temperature.Its weak point: the reducing agent consumption is large, and catalyst is easily poisoning, and the pipeline equipment requirement is high and denitration efficiency is not high.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, provide that a kind of conversion ratio is high, two sections microwave catalysis reaction bed method of denitration energy-conserving and environment-protective.
Purpose of the present invention is achieved by following technical proposals: described method is included in catalyst filling in the reaction tube of microwave catalysis reactor assembly and forms the microwave catalysis reaction bed, and processed gas gas-solid reaction occurs carry out the denitration processing by the microwave catalysis reaction bed time; Described microwave catalysis reaction bed is two microwave catalysis reaction beds of independently mutually connecting, and the catalyst of first paragraph microwave catalysis reaction bed is Cu-ZSM-5 or Mn/MgFe
2O
4Catalyst; The catalyst of second segment microwave catalysis reaction bed is active carbon or activated carbon supported MnO, CuO or CeO-CuO, MgO-FeO
x, CeO-ZrO
2Catalyst; Direct decomposition reaction, sequentially by first paragraph microwave catalysis reaction bed and second segment microwave catalysis reaction bed, first occurs with the catalyst of first paragraph in processed gas, then with the catalyst generation selective reduction of second segment, reacts, with removal of nitrogen oxide.
250 ℃-550 ℃ of the temperature of described first paragraph microwave catalysis reaction bed, preferred 320 ℃-420 ℃.
Described processed gas is 1-5 second by first paragraph microwave catalysis reaction bed reaction time, optimizes 1.5-3.5 second.
300 ℃-600 ℃ of described second segment microwave catalysis reaction bed temperature, preferred 420 ℃-550 ℃.
Described processed gas is 1-6 second by second segment microwave catalysis reaction bed reaction time, optimizes 1.5-3 second.
Mixed oxidization copper in described first paragraph microwave catalysis reaction bed, the mass ratio of the addition of cupric oxide is 10-70%, preferred 30-45%.
Compared with prior art, the present invention has the following advantages: non-secondary pollution, corrosion-free, conversion ratio is high, energy consumption is little, energy-conserving and environment-protective, and production cost is low.
The specific embodiment
The invention will be further described for following embodiment:
Described method is included in catalyst filling in the reaction tube of microwave catalysis reactor assembly and forms the microwave catalysis reaction bed, and processed gas gas-solid reaction occurs carry out the denitration processing by the microwave catalysis reaction bed time; Described microwave catalysis reaction bed is two microwave catalysis reaction beds of independently mutually connecting, and the catalyst of first paragraph microwave catalysis reaction bed is Cu-ZSM-5 or Mn/MgFe
2O
4Catalyst; The catalyst of second segment microwave catalysis reaction bed is active carbon or activated carbon supported MnO, CuO or CeO-CuO, MgO-FeO
x, CeO-ZrO
2Catalyst; Direct decomposition reaction, sequentially by first paragraph microwave catalysis reaction bed and second segment microwave catalysis reaction bed, first occurs with the catalyst of first paragraph in processed gas, then with the catalyst generation selective reduction of second segment, reacts, with removal of nitrogen oxide.
250 ℃-550 ℃ of the temperature of described first paragraph microwave catalysis reaction bed, preferred 320 ℃-420 ℃.
Described processed gas is 1-5 second by first paragraph microwave catalysis reaction bed reaction time, optimizes 1.5-3.5 second.
300 ℃-600 ℃ of described second segment microwave catalysis reaction bed temperature, preferred 420 ℃-550 ℃.
Described processed gas is 1-6 second by second segment microwave catalysis reaction bed reaction time, optimizes 1.5-3 second.
Mixed oxidization copper in described first paragraph microwave catalysis reaction bed, the mass ratio of the addition of cupric oxide is 10-70%, preferred 30-45%.
Embodiment is from laboratory.
In laboratory, waste gas for Dalian Da Te gas Co., Ltd provide for N
2With the gaseous mixture that NO forms, wherein NO concentration is 1000ppm.
Gas analyzer is Americanized 42C NO-NO
2-NO
xAnalyzer.
The power 0-1000w of microwave field is adjustable continuously, and frequency is 2400-2500MHz.The quartz ampoule reaction tube is WG1/2.45-Φ 5.4 * 54.Quartzy pipe range 535mm, internal diameter 10mm.
AC represents active carbon.
Embodiment 1:
The direct decomposing N O reaction of first paragraph microwave catalysis reaction bed microwave catalysis.
The catalyst of loading is the CuO-Cu-ZSM-5 of 5g, and in Cu-ZSM-5, the mass fraction of Cu is that the mass fraction of CuO in 5%, CuO-Cu-ZSM-5 is 40%.
Air inlet NO flow-control is at 160ml/min, and oxygen content is 5.88%,
The microwave power automatic catch is controlled, made reaction bed temperature maintain respectively 180 ℃, 300 ℃, 380 ℃, reaction pressure is normal pressure.
Result such as table 1:
The reaction result of table 1. different catalysts bed temperature
| Sequence number | Reaction bed temperature | The NO conversion ratio |
| 1 | 180℃ | 87.60％ |
| 2 | 300℃ | 97.95％ |
| 3 | 380℃ | 98.93％ |
Conclusion: when 380 ℃ of reaction bed temperatures, CuO-Cu-ZSM-5 has the effect of significant decomposing N O in the microwave catalysis reactor, and the NO conversion ratio reaches 98.93%.
Embodiment 2:
The impact of oxygen content on microwave catalysis decomposing N O.
Substantially with embodiment 1, different is that reaction bed temperature maintains 300 ℃, changes oxygen flow and content, investigates the antioxygen of this catalyst when microwave catalysis decomposing N O.Result such as table 2.
The impact of table 2. oxygen content on microwave catalysis decomposing N O
Wherein, import NO content is 1000ppm, and when oxygen existed, NO almost all was converted into safe N
2, reaction bed temperature is controlled at 300 ℃, and the NO conversion ratio is all more than 98%; Oxygen content is on microwave catalysis decomposing N O conversion ratio without impact, and during microwave catalysis, catalyst has good antioxygen.
Embodiment 3:
The reaction of second segment microwave catalysis reaction bed microwave catalysis reductive NO.
Load the 10ml active carbon in the crystal reaction tube of novel microwave catalytic reactor, investigate the performance of oxygen content test Mn modified activated carbon Reduction of NO under microwave.Oxygen content to Mn/AC catalyst microwave catalysis reductive NO result referring to table 3.
Reaction condition: 3%Mn/AC amount of fill 10ml, gas flow 160ml/min, nitric oxide production air inlet content 1000ppm, 400 ℃ of temperature.
The impact of table 3. oxygen content on Mn modified activated carbon Reduction of NO under microwave
| Sequence number | Oxygen flow | Oxygen content | Nitric oxide outlet content | Conversion ratio |
| 1 | 0ml.min-1 | 0％ | 7.5ppm | 99.25％ |
| 2 | 10ml.min-1 | 4％ | 3.5ppm | 99.65％ |
| 3 | 15ml.min-1 | 6％ | 2.8ppm | 99.72％ |
| 4 | 20ml.min-1 | 8％ | 3.3ppm | 99.67％ |
Conclusion: oxygen content has no significant effect Mn/AC catalyst microwave catalysis reductive NO conversion ratio.Carry out the reaction of microwave catalysis reductive NO through second segment microwave catalysis reaction bed, the NO conversion ratio can be up to 99.72%.
Embodiment 4
The impact of microwave catalysis reaction bed temperature on the NO conversion ratio.
Load the 10ml active carbon in crystal reaction tube, investigate reaction temperature, the performance of test Mn modified activated carbon Reduction of NO under microwave.
Reaction condition: 3%Mn/AC amount of fill 10ml, gas flow 160ml/min, 400 ℃ of nitric oxide production air inlet content 1000ppm. temperature.
Result is referring to table 4.
The impact of table 4 reaction bed temperature on the NO conversion ratio
| Sequence number | The reaction bed temperature | The 3%Mn/AC Catalyst Conversion | The AC Catalyst Conversion |
| 1 | 250℃ | 76.96％ | 62.90％ |
| 2 | 300℃ | 84.08％ | 75.70％ |
| 3 | 350℃ | 91.03％ | ---- |
| 4 | 380℃ | 99.12％ | ---- |
| 5 | 400℃ | 99.65％ | 92.50％ |
Conclusion: on Mn/AC catalyst microwave catalysis reduction reaction impact significantly, use the Mn carrying capacity is 3% activated carbon supported catalyst to the reaction bed temperature, and during 380 ℃, 400 ℃ of reaction bed temperature, the NO conversion ratio is respectively 99.12%, 99.65%; Use the AC catalyst not reach high conversion ratio.
Embodiment 5
The result of microwave catalysis activated-carbon catalyst reduction denitration is referring to table 5.
Reaction condition: active carbon amount of fill 10ml, gas flow 160ml/min, air speed is 1920h
-1Oxygen flow 10ml/min, oxygen content is 5.88%.
The impact of table 5 reaction temperature on microwave catalysis active carbon reductive NO activity
| Sequence number | Reaction temperature | The nitric oxide exit concentration | Conversion ratio | Remarks |
| 1 | 250℃ | 371ppm | 62.9％ | |
| 2 | 400℃ | 75.0ppm | 92.5％ | |
| 3 | 500℃ | 2.16ppm | 99.78％ | |
| 4 | 600℃ | 1.81ppm | 99.82％ | |
| 5 | 27℃ | 890ppm | 11％ | Remarks 1 |
Remarks 1: the nitric oxide of minimizing is by charcoal absorption.
Conclusion: with the rising of temperature, nitric oxide production conversion ratio increases.
Embodiment 6
First paragraph microwave catalysis reaction bed uses Cu-ZSM-5 copper zeolite catalyst, and the catalyst of filling is 5g CuO-Cu-ZSM-5, and in Cu-ZSM-5, the mass fraction of Cu is that the mass fraction of CuO in 5%, CuO-Cu-ZSM-5 is 40%.The microwave power automatic catch is controlled, is made reaction bed temperature maintain 300 ℃,
Second segment microwave catalysis reaction bed microwave catalysis 3%Mn/AC catalyst reduction denitration reaction.
3%Mn/AC amount of fill 10ml in the crystal reaction tube of novel microwave catalytic reactor, controls 500 ℃ of microwave catalysis reaction bed temperature.
Reaction condition: gas flow 160ml/min, air speed is 1920h
-1Oxygen flow 10ml/min, oxygen content is 5.88%, the nitric oxide production air inlet content of first paragraph is 1000ppm.
Two sections microwave catalysis reaction bed reaction results of table 6.
| Sequence number | First paragraph NO exit concentration | Conversion ratio | Second segment NO exit concentration | Total conversion |
| 1 | 37.1ppm | 96.29％ | 3.21ppm | 99.68％ |
| 2 | 25.0ppm | 97.50％ | 1.65ppm | 99.84％ |
| 3 | 31.0ppm | 96.90％ | 2.32ppm | 99.78％ |
| 4 | 22.5ppm | 97.75％ | 1.81ppm | 99.82％ |
| 5 | 28.0ppm | 97.20％ | 1.16ppm | 99.88％ |
Conclusion: two sections microwave catalysis reaction beds can be processed high concentration nitrous oxides exhaust gas, and first paragraph microwave catalysis reaction bed can be processed the NO more than 95%, and after second segment microwave catalysis reaction bed was processed again, the NO total conversion was more than 99%.The direct catalytic decomposition NO of first paragraph microwave catalysis reaction bed, do not need to consume reducing agent, so the reducing agent that second segment microwave catalysis reaction bed only need to consume seldom just can reach more than 99% and remove nitrogen oxide.
Above embodiment shows:
(1) adopt the novel microwave catalytic reactor device, the microwave catalysis reaction bed that uses the inventive method is two microwave catalysis reaction beds of independently mutually connecting, and the catalyst of first paragraph microwave catalysis reaction bed is Cu-HZSM-5 or Mn/MgFe
2O
4Catalyst; The catalyst of second segment microwave catalysis reaction bed is activated carbon supported MnO, CuO or CeO-CuO, MgO-FeO
x, CeO-ZrO
2Catalyst; Direct decomposition reaction and selective reduction reaction, by first paragraph and second segment microwave catalysis reaction bed, successively occur, with removal of nitrogen oxide in processed gas order.Two sections microwave catalysis reaction beds of the present invention can be processed high concentration nitrous oxides exhaust gas, and first paragraph microwave catalysis reaction bed can be processed the NO more than 95%; After second segment microwave catalysis reaction bed was processed again, the NO total conversion was more than 99%.The direct catalytic decomposition NO of first paragraph microwave catalysis reaction bed, do not need to consume reducing agent, so the reducing agent that second segment microwave catalysis reaction bed only need consume seldom just can reach more than 99% and remove nitrogen oxide.The present invention has non-secondary pollution, corrosion-free, conversion ratio is high, energy consumption is little, energy-conserving and environment-protective, and the advantage such as operating cost is low.
(2) the inventive method second segment microwave catalysis reaction bed, use a year Mn active carbon to be catalyst, the reaction of microwave selective Reduction of NO, or use active carbon to be catalyst, the reaction of microwave catalysis reductive NO; The NO conversion ratio can be near 99.9%, and the removal of nitrogen oxide rate is high.
(3) use simultaneously active carbon to be reducing agent, eliminated and used the secondary pollution of ammonia as reducing agent.
Claims (5)
1. one kind two sections microwave catalysis reaction bed method of denitration, described method is included in catalyst filling in the reaction tube of microwave catalysis reactor assembly and forms the microwave catalysis reaction bed, and processed gas gas-solid reaction occurs carry out the denitration processing by the microwave catalysis reaction bed time; It is characterized in that, described microwave catalysis reaction bed is two microwave catalysis reaction beds of independently mutually connecting, and the catalyst of first paragraph microwave catalysis reaction bed is Cu/HZSM-5 or Mn/MgFe
2O
4Catalyst, mixed oxidization copper in first paragraph microwave catalysis reaction bed, the mass ratio of the addition of cupric oxide are 10-70%; The catalyst of second segment microwave catalysis reaction bed is activated carbon supported MgO-FeO
x, CeO-ZrO
2Catalyst; Direct decomposition reaction, sequentially by first paragraph microwave catalysis reaction bed and second segment microwave catalysis reaction bed, first occurs with the catalyst of first paragraph in processed gas, then with the catalyst generation selective reduction of second segment, reacts, with removal of nitrogen oxide.
2. method according to claim 1, is characterized in that, the temperature of described first paragraph microwave catalysis reaction bed is 250 ℃-550 ℃.
3. method according to claim 1 and 2, is characterized in that, described processed gas is 1-5 second by first paragraph microwave catalysis reaction bed reaction time.
4. method according to claim 1 and 2, is characterized in that, described second segment microwave catalysis reaction bed temperature is 300 ℃-600 ℃.
5. method according to claim 3, is characterized in that, described processed gas is 1-6 second by second segment microwave catalysis reaction bed reaction time.
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| CN2011104512185A CN102407073B (en) | 2011-12-30 | 2011-12-30 | Denitration method for two-section microwave catalytic reaction bed |
| PCT/CN2012/087342 WO2013097676A1 (en) | 2011-12-30 | 2012-12-24 | Process for removing nitrogen oxides by microwave catalysis |
| US14/318,740 US9199196B2 (en) | 2011-12-30 | 2014-06-30 | Process for removing nitrogen oxides from gas using microwave catalytic reaction by microwave catalysis |
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| CN2011104512185A CN102407073B (en) | 2011-12-30 | 2011-12-30 | Denitration method for two-section microwave catalytic reaction bed |
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| WO2013097676A1 (en) * | 2011-12-30 | 2013-07-04 | 湘潭大学 | Process for removing nitrogen oxides by microwave catalysis |
| CN103011333B (en) * | 2012-12-25 | 2014-06-18 | 湘潭大学 | Method for degrading organic wastewater by using ferrite microwave catalyst |
| CN106029224A (en) * | 2014-10-31 | 2016-10-12 | 云南创森环保科技有限公司 | Nitrogen oxide ammonia-free low-temperature selective reduction catalyst, preparation method therefor, and uses thereof |
| CN104437080A (en) * | 2014-12-29 | 2015-03-25 | 湘潭大学 | Denitration method for microwave catalytic decomposition of NO and method of preparing Cu-ZSM-11 |
| CN106268225A (en) * | 2016-08-04 | 2017-01-04 | 李祖良 | A kind of microwave purifying device |
| CN115957619A (en) * | 2021-10-11 | 2023-04-14 | 华北电力大学（保定） | Microwave catalytic oxidation denitration method for ferro-manganese based molecular sieve |
| CN114471148A (en) * | 2022-03-01 | 2022-05-13 | 浙江浩普环保工程有限公司 | Microwave heating dissociation denitration method for flue gas of thermal power plant |
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| CN101972603A (en) * | 2010-10-25 | 2011-02-16 | 湘潭大学 | Method for removing nitrogen oxides from waste gas |
| CN102179169B (en) * | 2011-03-15 | 2012-12-26 | 浙江大学 | Method for removing nitric oxides by absorption and plasma selective catalytic reduction |
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