JPH0815532B2 - Exhaust gas treatment method - Google Patents
Exhaust gas treatment methodInfo
- Publication number
- JPH0815532B2 JPH0815532B2 JP62122444A JP12244487A JPH0815532B2 JP H0815532 B2 JPH0815532 B2 JP H0815532B2 JP 62122444 A JP62122444 A JP 62122444A JP 12244487 A JP12244487 A JP 12244487A JP H0815532 B2 JPH0815532 B2 JP H0815532B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- gas
- hydrogen radicals
- gas treatment
- treatment method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、排ガス中に含まれるNOXおよびSOXを電磁波
あるいは電子ビームを利用して除去する方法に関する。TECHNICAL FIELD The present invention relates to a method for removing NO X and SO X contained in exhaust gas by using an electromagnetic wave or an electron beam.
従来から燃焼排ガス中のNOX,SOX除去方法は多くの方
法が知られているが、なかでもNOXに対しては排ガス中
にアンモニアを注入し、触媒の存在下に接触還元を行う
方法等乾式の触媒による方法が主流を占めており、ま
た、SOXに対しては吸収液として石灰水溶液を用い副生
物として石こうを回収する石灰−石こう法による湿式法
等が主流を成している。Conventionally, many methods are known for removing NO X and SO X in combustion exhaust gas, but among them, NO X is injected into the exhaust gas with ammonia and catalytic reduction is performed in the presence of a catalyst. The mainstream is the method using an iso-dry catalyst, and the mainstream is a wet method such as the lime-gypsum method for recovering gypsum as a byproduct using an aqueous lime solution as an absorbing liquid for SO X. .
このような従来の排ガス処理技術では、NOX,SOXの処
理はそれぞれ別々のプロセスで実施され、それぞれ固体
の脱硝触媒および吸収媒体としての石灰水溶液や固体吸
着剤等が必要であり、さらにまた脱硝と脱硫とを複数の
段階で行なうため、プロセスは複雑となり、したがっ
て、使用する機器の点数も多くなり、その結果、装置費
や運転費が多額になるという問題点があった。In such a conventional exhaust gas treatment technology, NO X and SO X treatments are carried out in separate processes, respectively, and a solid denitration catalyst and a lime aqueous solution or a solid adsorbent as an absorption medium are required. Since denitration and desulfurization are carried out in a plurality of stages, the process becomes complicated, and therefore the number of equipments used increases, resulting in a large amount of equipment and operating costs.
本発明は、上記のような従来の排ガス処理方法の欠点
を改良した排ガスの処理方法すなわち排ガス中のNOXお
よびSOXを処理するための触媒や吸収液および吸着剤等
を必要としないでNOXとSOXとを単一プロセスで一段階で
処理できる新規なNOXおよびSOXの除去方法を提供するこ
とを目的としたものである。The present invention is a method for treating exhaust gas, which is an improvement of the drawbacks of the conventional exhaust gas treatment methods described above, that is, NO without the need for a catalyst, an absorbing liquid, an adsorbent, etc. for treating NO X and SO X in the exhaust gas. It is an object of the present invention to provide a novel NO X and SO X removal method capable of treating X and SO X in a single process in one step.
本発明はNOXおよびSOXを含む排ガスの処理方法におい
て、水素ラジカルを発生する前駆体を含むガスに電磁波
あるいは電子ビームを照射して水素ラジカルを生成さ
せ、この水素ラジカルを含むガスを上記の排ガスに混合
して、NOXおよびSOXを同時に分解処理することを特徴と
する排ガスの処理方法を提案するものである。In the method for treating exhaust gas containing NO X and SO X , the present invention irradiates an electromagnetic wave or an electron beam to a gas containing a precursor that generates hydrogen radicals to generate hydrogen radicals, and the gas containing the hydrogen radicals is treated as described above. The present invention proposes a method for treating exhaust gas, which is characterized in that NO X and SO X are simultaneously decomposed by mixing with exhaust gas.
アンモニア等の水素ラジカルを発生する前駆体を含む
ガスに、電磁波あるいは電子ビームを照射すると、前駆
体や共存する物質から水素ラジカル（Ｈ・）や酸素ラジ
カル（Ｏ・）が発生する。これらのラジアルを含むガス
を処理対象のNOXおよびSOXを含む排ガスに注入し混合す
るとたとえば次のような反応が生じる。When a gas containing a precursor that generates hydrogen radicals such as ammonia is irradiated with an electromagnetic wave or an electron beam, hydrogen radicals (H.) and oxygen radicals (O.) are generated from the precursor and coexisting substances. When the gas containing these radials is injected into the exhaust gas containing NO X and SO X to be treated and mixed, the following reaction occurs, for example.
上記の（１），（２）式に示すようにNOは還元されて
N2に、SO2は還元されて単体イオウであるＳに分解され
る。 NO is reduced as shown in equations (1) and (2) above.
SO 2 is reduced to N 2 and decomposed into S, which is elemental sulfur.
また、Ｏ・とSO2からSO3が発生し、更にこれが水およ
び水素ラジカルの前駆体として供給したアンモニアの残
余のアンモニアと反応して硫安が生成する。生成するN2
やH2Oは無害であり後処理の必要がないがＳおよび（N
H4）2SO4は処理ガス中に固体状で含まれるので集塵器で
除去される。Further, SO 3 is generated from O · and SO 2 , and this reacts with water and the residual ammonia supplied as a precursor of hydrogen radicals to form ammonium sulfate. Generate N 2
And H 2 O are harmless and require no post-treatment, but S and (N
H 4 ) 2 SO 4 is contained in the process gas in solid form and is removed by the dust collector.
本発明の方法で用いられる水素ラジカルを発生する前
駆体としては、アンモニア、アミン、ヒドラジン、アル
コール、ホルムアルデヒド等あるいはそれらの誘導体が
あげられる。Examples of the hydrogen radical-generating precursor used in the method of the present invention include ammonia, amine, hydrazine, alcohol, formaldehyde and the like, or their derivatives.
また、本発明の方法では、電磁波としては紫外・可視
・赤外光およびマイクロ波が用いられるが、波長範囲が
150mm〜16μｍの紫外・可視・赤外光としては、アルゴ
ン、CO2、エキサイマ等のガスレーザシステムおよびイ
ットリウム−アルミニウム−ガーネット（YAG）等の固
体レーザシステムを用いて出射されるレーザ光が用いら
れる。Further, in the method of the present invention, ultraviolet / visible / infrared light and microwaves are used as electromagnetic waves, but the wavelength range is
As the UV / visible / infrared light of 150 mm to 16 μm, laser light emitted using a gas laser system such as argon, CO 2 , and excimer and a solid-state laser system such as yttrium-aluminum-garnet (YAG) is used.
さらにまた上記のマイクロ波を用いる場合は、水素ラ
ジカルを発生する前駆体を誘導した空洞共振器内で照射
する。Furthermore, when the above microwave is used, irradiation is performed within a cavity in which a precursor that generates hydrogen radicals is induced.
なお、水素ラジカルを含むガスは、排ガスに対して、
排ガスが露点に致らない温度、すなわち50〜100℃の温
度範囲で水素ラジカルとNOX＋SOXのモル比が3:1以下に
なるように混合される。The gas containing hydrogen radicals is
The exhaust gas is mixed so that the molar ratio of hydrogen radical and NO X + SO X is 3: 1 or less at a temperature not exceeding the dew point, that is, in the temperature range of 50 to 100 ° C.
つぎに本発明の方法について 行なった実施例を第１図の説明図に基いて説明する。
NO、SO2、NH3、N2の試験ガスがそれぞれ別々に封入され
ている試験ガスボンベ１からガス流量調整器２により流
量を調整してNH3ガスN2ガスとを抜き出し混合してNH3濃
度が１％のNH3含有ガス３を調整した。ついでこのNH3含
有ガス３をガス流量30cc/sで反応セル４に導入し、ArF
エキシマレーザーシステム５からの波長193nmのレーザ
ー光６を100Hzのパルス発振の条件（１〜100Hzで発振さ
せてもよい）で連続照射した。レーザー光の照射により
NH3は励起されＨ・ラジカルが生成する。An embodiment of the method of the present invention will be described below with reference to the explanatory view of FIG.
From the test gas cylinder 1 in which the test gases of NO, SO 2 , NH 3 and N 2 are separately sealed, the flow rate is adjusted by the gas flow rate controller 2 and the NH 3 gas and N 2 gas are extracted and mixed to produce NH 3 NH 3 containing gas 3 having a concentration of 1% was prepared. Then, this NH 3 containing gas 3 was introduced into the reaction cell 4 at a gas flow rate of 30 cc / s, and ArF was added.
Laser light 6 having a wavelength of 193 nm from the excimer laser system 5 was continuously irradiated under the condition of pulse oscillation of 100 Hz (may be oscillated at 1 to 100 Hz). By irradiation of laser light
NH 3 is excited to generate H radicals.
一方、NH3含有ガスを調整する場合と同様な方法で、N
O、SO2およびN2ガスを試験ガスボンベ１から抜き出し混
合して、NO濃度100ppmSO2濃度600ppmの供試ガス７を調
整した。このようにして調整した供試ガス７をガス流量
30cc/sでガス混合器８に導き反応セル４からのＨ・ラジ
カルを含むガスと80℃で混合した。On the other hand, in the same way as when adjusting the NH 3 -containing gas, N
O, SO 2 and N 2 gases were extracted from the test gas cylinder 1 and mixed to prepare a test gas 7 having a NO concentration of 100 ppm and a SO 2 concentration of 600 ppm. The gas flow rate of the sample gas 7 adjusted in this way
It was introduced into the gas mixer 8 at 30 cc / s and mixed with the gas containing H · radicals from the reaction cell 4 at 80 ° C.
混合すると同時に供試ガス７中に含まれているNOとSO
2はＨ・と反応して分解しN2とＳに変換する。NO and SO contained in test gas 7 at the same time as mixing
2 reacts with H., decomposes and transforms into N 2 and S.
反応後のガスをガス組成分析計９に導きガス組成を分
析しNOおよびSO2の分解率を求めた。その結果、NOおよ
びSO2の分解率は共に70％であった。この実験例から本
発明の方法は排ガス処理に有効であることを認めた。The gas after the reaction was introduced into a gas composition analyzer 9 and the gas composition was analyzed to determine the decomposition rates of NO and SO 2 . As a result, the decomposition rates of NO and SO 2 were both 70%. From this experimental example, it was confirmed that the method of the present invention is effective for treating exhaust gas.
本発明の排ガスの処理方法によれば次のような効果を
奏する。According to the exhaust gas treatment method of the present invention, the following effects can be obtained.
（１） NOXとSOXを別々のプロセスでかつ複数段階で処
理する必要がなく、単一プロセスで一段でNOXとSOXとを
同時に処理することができ、プロセスが単純となり、し
たがって必要とする機器点数も少なくなる。(1) NO X and SO X need not be processed in separate processes and in multiple stages, but NO X and SO X can be simultaneously processed in a single stage in a single process, which simplifies the process and is therefore necessary. The number of equipment to be used also decreases.
（２） 従来のプロセスで必要とした触媒や吸収液、吸
着剤等を必要としない。(2) The catalyst, the absorbing liquid, the adsorbent and the like which are required in the conventional process are not required.
（３） 排ガス中のNOXおよびSOXを処理するために、本
発明では処理すべき排ガス全体に電磁波あるいは電子ビ
ームを照射するのではなく、添加するガスにのみ電磁波
あるいは電子ビームを照射させるので、NOXおよびSOXと
の反応性、反応効率が向上し、また、排ガスによる光学
系の汚染が防止され、排ガス中の不純物によるエネルギ
のロスを低減することが可能である。(3) In order to treat NO X and SO X in exhaust gas, in the present invention, the entire exhaust gas to be treated is not irradiated with electromagnetic waves or electron beams, but only the gas to be added is irradiated with electromagnetic waves or electron beams. , NO X and SO X , the reactivity and reaction efficiency are improved, the optical system is prevented from being contaminated by exhaust gas, and the energy loss due to impurities in the exhaust gas can be reduced.
第１図は本発明の実験例を説明するための説明図であ
る。 １……試料ガスボンベ,2……ガス流量調整器， ３……NH3含有ガス,4……反応セル， ５……ArFエキシマレーザーシステム， ６……レーザー光,7……供試ガス， ８……ガス混合器,9……ガス組成分析計。FIG. 1 is an explanatory diagram for explaining an experimental example of the present invention. 1 …… Sample gas cylinder, 2 …… Gas flow regulator, 3 …… NH 3 containing gas, 4 …… Reaction cell, 5 …… ArF excimer laser system, 6 …… Laser light, 7 …… Test gas, 8 …… Gas mixer, 9 …… Gas composition analyzer.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｄ 53/60 53/74 Ｂ０１Ｄ 53/34 ＺＡＢ (72)発明者 団野 実 広島県広島市西区観音新町４丁目６番22号 三菱重工業株式会社広島研究所内 (56)参考文献 特開 昭60−71028（ＪＰ，Ａ) 特開 昭53−125265（ＪＰ，Ａ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Reference number within the agency FI Technical indication location B01D 53/60 53/74 B01D 53/34 ZAB (72) Inventor Minoru Danno Kannon, Nishi-ku, Hiroshima-shi, Hiroshima 4-6-22 Shinmachi Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory (56) Reference JP-A-60-71028 (JP, A) JP-A-53-125265 (JP, A)
Claims (1)
いて、水素ラジカルを発生する前駆体を含むガスに電磁
波あるいは電子ビームを照射して水素ラジカルを生成さ
せ、この水素ラジカルを含むガスを上記の排ガスに混合
して、NOXおよびSOXを同時に分解処理することを特徴と
する排ガスの処理方法。1. A method for treating an exhaust gas containing NO X and SO X , wherein a gas containing a precursor that generates hydrogen radicals is irradiated with an electromagnetic wave or an electron beam to generate hydrogen radicals, and the gas containing the hydrogen radicals is generated. A method for treating exhaust gas, which comprises mixing NO x and SO x at the same time by mixing with the above exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122444A JPH0815532B2 (en) | 1987-05-21 | 1987-05-21 | Exhaust gas treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122444A JPH0815532B2 (en) | 1987-05-21 | 1987-05-21 | Exhaust gas treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63287534A JPS63287534A (en) | 1988-11-24 |
| JPH0815532B2 true JPH0815532B2 (en) | 1996-02-21 |
Family
ID=14836000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62122444A Expired - Lifetime JPH0815532B2 (en) | 1987-05-21 | 1987-05-21 | Exhaust gas treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0815532B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6411628A (en) * | 1987-07-03 | 1989-01-17 | Mitsubishi Heavy Ind Ltd | Removing method of nox |
| JP2607548B2 (en) * | 1987-10-09 | 1997-05-07 | 三菱重工業株式会社 | Exhaust gas treatment method |
| US5171554A (en) * | 1990-09-20 | 1992-12-15 | Molecular Technology Corporation | Conversion of formaldehyde and nitrogen to a gaseous product and use of gaseous product in reduction of nitrogen oxide in effluent gases |
| JP2010058009A (en) * | 2008-09-01 | 2010-03-18 | Landmark Technology:Kk | Method of decomposing nitrogen trifluoride and device using this method |
| JP5865583B2 (en) * | 2010-10-04 | 2016-02-17 | ウシオ電機株式会社 | Non-catalytic denitration method and apparatus for exhaust gas |
| US9353665B2 (en) * | 2014-09-15 | 2016-05-31 | Cummins Emission Solutions, Inc. | Ammonia generation system for an SCR system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1550834A (en) * | 1975-07-24 | 1979-08-22 | Telcon Metals Ltd | Semiconductor devices |
| JPS58884A (en) * | 1981-06-24 | 1983-01-06 | Nakano Vinegar Co Ltd | Preparation of adlay vinegar |
| JPS6168126A (en) * | 1984-09-10 | 1986-04-08 | Ishikawajima Harima Heavy Ind Co Ltd | Wet method for desulfurizing and denitrating stack gas |
| JPS62250933A (en) * | 1986-04-24 | 1987-10-31 | Ebara Corp | Exhaust gas treatment method and device using electron beam irradiation |
-
1987
- 1987-05-21 JP JP62122444A patent/JPH0815532B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63287534A (en) | 1988-11-24 |
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