JP2864640B2 - NO ▲ lower x gas processing equipment - Google Patents
NO ▲ lower x gas processing equipmentInfo
- Publication number
- JP2864640B2 JP2864640B2 JP2068905A JP6890590A JP2864640B2 JP 2864640 B2 JP2864640 B2 JP 2864640B2 JP 2068905 A JP2068905 A JP 2068905A JP 6890590 A JP6890590 A JP 6890590A JP 2864640 B2 JP2864640 B2 JP 2864640B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- reaction
- tube
- plasma
- reaction tube
- 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
- 239000007789 gas Substances 0.000 claims description 73
- 238000006243 chemical reaction Methods 0.000 claims description 48
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 239000007864 aqueous solution Substances 0.000 claims description 12
- -1 azide compound Chemical class 0.000 claims description 7
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 15
- 230000000694 effects Effects 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- PXIPVTKHYLBLMZ-UHFFFAOYSA-N Sodium azide Chemical compound [Na+].[N-]=[N+]=[N-] PXIPVTKHYLBLMZ-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】 A.産業上の利用分野 本発明はNOXガスの処理装置に関し、特にディーゼル
機関およびガスタービン原動機の排気ガス中のNOXガス
の処理装置に関する。BACKGROUND OF THE INVENTION Field of the A. industrial invention relates to apparatus of the NO X gas, more particularly processor of the NO X gas in the exhaust gas of a diesel engine and a gas turbine engine.
B.発明の概要 本発明はNOXガスの処理装置において、 酸素条件下でアジ化化合物を溶解した水溶液を投入す
る反応筒にプラズマ発生装置を備えたプラズマ発生管を
設けることにより同一反応筒内でプラズマとアジ化化合
物が直接的に相まって相乗的に働くことにより有害で危
険なアンモニアを使用することなくNOXを低減すると共
に処理装置のより一層の小型化を可能とする。Overview B. INVENTION The present invention is in the processing apparatus of the NO X gas, the same reaction cylinder by providing a plasma generating tube having a plasma generator into the reaction tube to inject aqueous solution of azide compound in oxygen conditions in enabling further downsizing of the apparatus while reducing without NO X that plasma and azide compounds to use toxic and hazardous ammonia by work together synergistically directly.
C.従来の技術 従来、NOXガス処理は排煙脱硝技術として実用化され
ている。排煙脱硝方法としては乾式法と湿式法に大別さ
れ、最も進んでいるのは乾式法の選択接触還元法であ
る。この方法の利点としては次の３点が挙げられる。C. Description of the Related Art conventionally, NO X gas treatment is practically used as denitrification technology. The flue gas denitrification method is roughly classified into a dry method and a wet method, and the most advanced is the selective catalytic reduction method of the dry method. This method has the following three advantages.
（１）システムが簡単である。(1) The system is simple.
（２）高脱硝率が可能である。(2) High denitration rate is possible.
（３）NOXが無害なN2とH2Oに分解され排出処理等が不要
である。(3) NO X is decomposed into harmless N 2 and H 2 O, and no exhaust treatment is required.
この選択接触還元法では還元剤としてアンモニア，炭
化水素，一酸化炭素が使用されている。この中でアンモ
ニアは酸素が共存していても選択的にNOXと反応するが
他の還元剤は酸素と反応する。このため特にディーゼル
およびガスタービン原動機の場合は酸素が共存していて
も選択的にNOXと反応するアンモニアガスが用いられて
いる。また、この反応に使用する触媒としてはPtなどの
貴金属系やAl2O3,TiO2などに担持させた各種金属酸化物
などが挙げられる。ディーゼルおよびガスタービン原動
機の燃焼で生成するNOXの成分はほとんどがNOでありNO2
は５％程度である。このためNOをアンモニアガスと混合
させて、この混合気体を触媒上で接触還元させてN2とH2
Oに分解している。次にこの反応式を示す。In this selective catalytic reduction method, ammonia, hydrocarbon, and carbon monoxide are used as reducing agents. Reacts in this ammonia selectively to NO X even coexist oxygen other reducing agent reacts with oxygen. For this reason, particularly in the case of diesel and gas turbine prime movers, ammonia gas that selectively reacts with NO X is used even when oxygen coexists. Examples of the catalyst used in this reaction include a noble metal such as Pt and various metal oxides supported on Al 2 O 3 and TiO 2 . The components of NO X generated by the combustion of diesel and gas turbine prime movers are mostly NO and NO 2
Is about 5%. Therefore, NO is mixed with ammonia gas, and this mixed gas is catalytically reduced on a catalyst to form N 2 and H 2.
Decomposed into O. Next, this reaction formula is shown.
しかしながら、上記反応方式で示した選択的接触還元
法では次に示すような問題点があった。 However, the selective catalytic reduction method shown in the above reaction scheme has the following problems.
（１）NOXを分解するために有害で危険なアンモニアガ
スを使用しなくてはならない。(1) must be used toxic and hazardous ammonia gas to decompose NO X.
（２）アンモニアガスによる還元触媒性能が劣化する。
特に還元触媒は排気されるガス成分によっても劣化する
ため、交換等を必要としてその操作が面倒である。(2) The performance of the reduction catalyst by ammonia gas is deteriorated.
In particular, since the reduction catalyst is deteriorated by the exhaust gas component, it requires replacement or the like, and its operation is troublesome.
（３）使用温度の範囲が制限される。(3) The operating temperature range is limited.
即ち、高温（1000℃程度）では触媒成分の焼結が進行
し、結晶の相転移により触媒性能が劣化する。また、32
0℃以下ではアンモニアガスと水分がSOXを含む排気ガス
と反応して酸性硫安などの化合物を生じ、脱硝性能の低
下を生じる。これらのことから、従来の還元法の使用温
度の範囲は320〜450℃であった。従って使用温度範囲が
制限されると共に常温での使用が困難であった。That is, at a high temperature (about 1000 ° C.), the sintering of the catalyst component proceeds, and the catalytic performance deteriorates due to the phase transition of the crystal. Also, 32
At 0 ° C. or lower, ammonia gas and moisture react with the exhaust gas containing SO X to produce compounds such as acidic ammonium sulfate, which lowers the denitration performance. From these facts, the range of operating temperature in the conventional reduction method was 320 to 450 ° C. Therefore, the working temperature range is limited, and it is difficult to use at room temperature.
（４）処理装置全体の小型化が困難である。(4) It is difficult to reduce the size of the entire processing apparatus.
このことは、上記反応式からNOXの還元反応は等モル
であるため、脱硝率に合せてNOX量にほぼ等しいアンモ
ニアガスを排気ガス中へ注入しなければならず、そのた
めアンモニアガスボンベ、触媒等が大型となり装置全体
の小型化が困難なためである。This means that since the reduction reaction of NO X is equimolar from the above reaction formula, it is necessary to inject ammonia gas approximately equal to the amount of NO X into the exhaust gas in accordance with the denitration rate. This is because it is difficult to reduce the size of the entire apparatus due to large size.
このため本発明者らは上記問題点を解決すべく鋭意研
究した結果、有害で危険なアンモニアガスに代えてアジ
化ナトリウム（以下、NaN3という）を用いること、及び
酸素及びプラズマ処理から選ばれる少なくとも一種を用
いることにより著しくNOXを低減できることを見い出
し、NOXガスの処理方法及びその装置を完成した（特願
平第１−30236号及び第２−29255号）。Therefore, the inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, have been selected from using sodium azide (hereinafter, referred to as NaN 3 ) instead of harmful and dangerous ammonia gas, and oxygen and plasma treatment. It found that can reduce significantly NO X by using at least one, thereby completing the processing method and apparatus of the NO X gas (Japanese Patent Application No. 1-30236 and No. 2-29255).
即ち本発明者らは上記出願でNaN3を投入したNOX処理
装置（以下、スクラバー方式という）とプラズマ発生装
置を備えたプラズマ反応筒（以下、プラズマ放電方式と
いう）とがそれぞれ分離又は独立した構造を有するNOX
ガスの処理装置を提案した。That is, the present inventors NO X treatment apparatus was charged with NaN 3 in the above application (hereinafter, referred to as a scrubber system) plasma reaction tube equipped with a plasma generator (hereinafter, referred to as plasma discharge system) and were each separated or independent NO X with structure
A gas treatment unit was proposed.
D.発明が解決しようとする課題 しかしながら、上記出願に係る処理装置ではスクラバ
ー方式がプラズマ放電方式と分離されているため、プラ
ズマ効果とNaN3効果を十分発揮し得ず、装置自体の小型
化にも限界があった。D. Problems to be Solved by the Invention However, in the processing apparatus according to the above-mentioned application, since the scrubber method is separated from the plasma discharge method, the plasma effect and the NaN 3 effect cannot be sufficiently exhibited, so that the apparatus itself can be reduced in size. Even had limitations.
従って本発明は上記出願に係る問題点を解決するため
に創案されたものであって、 NOX処理装置のスクラバー方式がプラズマ放電方式と
一体化することによりプラズマ効果とNaN3効果とが一体
となりより一層相乗的効果を生じ、これにより著しくNO
X処理率を向上させかつNOX処理装置をより一層小型化す
ることを目的とする。Accordingly, the present invention was being developed to solve the problems related to the application, the plasma effect and NaN 3 effect is integrated by the scrubber system of the NO X processor are integrated with the plasma discharge system It produces an even more synergistic effect, which results in marked NO
An object of the present invention is to improve the X processing rate and further downsize the NO X processing apparatus.
E.課題を解決するための手段及び作用 本発明者らは上記問題点を解決すべく鋭意検討した結
果、NOX処理装置のスクラバー方式にプラズマ放電方式
を組み込むことにより、一層NOX処理率を向上できるこ
とを見い出し、本発明に係るNOXガスの処理装置を完成
した。E. SUMMARY and effects the present inventors for solving the a result of intensive studies to solve the above problems, by incorporating a plasma discharge system to the scrubber system of the NO X processor, the more NO X treatment ratio found can be improved, thereby completing the processing apparatus of the NO X gas according to the present invention.
即ち、本発明に係るNOXガスの処理装置は、酸性条件
下でNaN3を溶解した水溶液を投入する反応筒と、 該反応筒内に固定されプラズマ発生装置を備えたプラ
ズマ発生管と、 該プラズマ発生管内に前記反応筒と連結されかつラセ
ン状に形成されたハネを備えたNOXと空気及び酸素から
選ばれる一種との混合気体を導入する導入管と、 前記混合気体と前記アジ化化合物を反応させて、前記
NOXガスを還元除去するために前記反応筒に設けた排気
口と、を含むことをその解決手段としている。That is, the processing apparatus of the NO X gas according to the present invention, a reaction tube to inject aqueous solution of NaN 3 under acidic conditions, and the plasma generating tube having a fixed in the reaction tube in the plasma generating apparatus, wherein an introduction tube for introducing a gas mixture of one selected from the NO X and air and oxygen with the coupled reaction tube and wings formed in helical plasma generating tube, the azide compound and the mixed gas And reacting
An exhaust port provided in the reaction tube in order to reduce and remove NO X gas, to include are the possible solutions.
以下、本発明について更に詳細に説明する。 Hereinafter, the present invention will be described in more detail.
本発明に係る装置に使用するNOXガスの処理方法は特
に理論にこだわるつもりはないが、NaN3を水に溶解し、
この水溶液とNOXガスの反応でNOXをN2＋H2Oに化学的に
変えることをその原理とする。The method of treating NO X gas used in the apparatus according to the present invention is not particularly limited to theory, but dissolves NaN 3 in water,
The principle is to chemically convert NO X into N 2 + H 2 O by the reaction between this aqueous solution and NO X gas.
即ち、この反応は次の３つの式から説明される。 That is, this reaction is explained by the following three equations.
NO＋NO2＋→2HNO2 …（１） 6NaN3＋6Hcl→6N3H＋6Nacl …（２） 2HNO2＋6N3H→10N2＋4H2O …（３） 通常、ガスを液体に吸収させるのは非常に効率が悪
い。上記（１）式はNO,NO2を水に吸収させてHNO2にする
反応であり、この反応が全反応速度を支配するいわゆる
律速段階である。従ってこの段階の反応が効率よく行う
ことができれば、上記（３）式の反応は容易に進行す
る。このことが本発明が解決せんとする中心課題と言え
る。 NO + NO 2 + → 2HNO 2 ... (1) 6NaN 3 + 6Hcl → 6N 3 H + 6Nacl ... (2) 2HNO 2 + 6N 3 H → 10N 2 + 4H 2 O ... (3) Normally, to absorb the gas in the liquid is very efficient bad. The above equation (1) is a reaction in which NO and NO 2 are absorbed into water to form HNO 2 , and this reaction is a so-called rate-determining step that controls the overall reaction rate. Therefore, if the reaction at this stage can be carried out efficiently, the reaction of the above formula (3) proceeds easily. This can be said to be a central problem to be solved by the present invention.
即ちこのNOXガスの処理方法では上記（１）式の反応
を酸素を用いることで効率よく進行させることができ
る。また、酸素を含む限り、空気を用いることもでき、
いずれを用いてもNOXガスの処理目的は十分達成し得る
が、上記（１）式をより効率的に進行させるためには酸
素濃度は高い方が好ましい。That is, in this NO X gas treatment method, the reaction of the above formula (1) can be efficiently advanced by using oxygen. Also, air can be used as long as it contains oxygen,
While any of the can processing purposes is sufficiently achieved of the NO X gas be used, in order to proceed more efficiently equation (1) oxygen concentration is preferably higher.
次に、上記（２）式の反応は予め別に行い、これによ
りNaN3はN3Hに変換される。この際、完全に反応を進行
させるため酸性条件下にする必要がある。この条件はpH
を３以下にすることが望ましく塩酸などを数滴添加すれ
ば足りる。Next, the reaction of the above formula (2) is separately performed in advance, whereby NaN 3 is converted to N 3 H. At this time, it is necessary to be under acidic conditions in order to make the reaction proceed completely. This condition is pH
Is desirably 3 or less, and it is sufficient to add a few drops of hydrochloric acid or the like.
更に、上記（３）式の反応は上記（１）式で得られた
HNO2を上記（２）で得られたN3Hにより還元してN2とH2O
に分解する。こうして処理されたN2を処理ガスとして排
出する。Further, the reaction of the above formula (3) was obtained by the above formula (1).
HNO 2 is reduced with N 3 H obtained in the above (2) to reduce N 2 and H 2 O
Decompose into The N 2 thus treated is discharged as a treated gas.
次に、このNOXガスの処理方法を好適に実施し得る本
発明に係るNOXガスの処理装置について説明する。Next, a description will be given of a process apparatus of the NO X gas according to the present invention that may be suitably implemented method of processing the NO X gas.
上記（１）〜（３）の反応はすべてこの装置内に設け
られた反応筒内で進行する。この反応筒には導入管が連
結され、この導入管を通じてまず塩酸などを数滴添加し
たNaN3水溶液を反応筒内に投入し上記（２）の反応式を
進行させる。次に、この導入管を通じてNOXと空気及び
酸素から選ばれる一種との混合気体を導入し、導入管に
設けられた吹出し口から反応筒内に注入し、上記（１）
及び（３）の反応式を進行させる。この際、導入管にら
せん状に形成されたハネを設け、混合気体をハネに沿っ
て上昇させ、NaN3水溶液との接触時間を長くし、上記
（１）及び（３）の反応式を十分に進行させる。All the reactions (1) to (3) proceed in a reaction tube provided in the apparatus. An introduction tube is connected to the reaction tube, and an aqueous solution of NaN 3 to which a few drops of hydrochloric acid or the like are added is introduced into the reaction tube through the introduction tube, and the reaction formula (2) is advanced. Next, a mixed gas of NO X and one selected from air and oxygen is introduced through the introduction pipe, and is injected into the reaction tube through a blowout port provided in the introduction pipe.
And (3). At this time, a spirally formed splash is provided in the inlet tube, the mixed gas is raised along the splash, the contact time with the NaN 3 aqueous solution is lengthened, and the reaction equations (1) and (3) are sufficiently performed. Proceed to
更に、本発明に係る装置では酸素に加えて高周波など
によるプラズマを用いることでより効率的に上記（１）
式を進行させる。即ち、この装置は反応筒内にプラズマ
発生装置を備えたプラズマ発生管を設けることにより、
高周波などのいわゆる電気エネルギーにより発生するプ
ラズマによりNOXと酸素及び空気が選ばれる一種との混
合気体を活性化させ、これにより上記（１）の反応をよ
り一層効果的に進行しうる。このことは、上記（１）の
反応は酸素のみでも進行するが、プラズマと酸素が相ま
うことで相乗的な効果を生じNOXをほぼ完全にNHO2に変
換できることを意味する。Further, in the apparatus according to the present invention, the above-mentioned (1) is more efficiently achieved by using plasma by high frequency or the like in addition to oxygen.
Advance the expression. That is, this apparatus is provided with a plasma generating tube having a plasma generating device in a reaction tube,
Activating the gas mixture with one of NO X and oxygen and air is selected by the plasma generated by a so-called electric energy such as high frequency, thereby can progress more effectively the above reaction (1). This means that although the reaction of the above (1) proceeds with only oxygen, a synergistic effect is produced by the combination of plasma and oxygen, and NO X can be almost completely converted to NHO 2 .
このプラズマ放電方式を行うに際し、導入管に設けた
らせん状に形成されたハネを回転し、混合気体を含むNa
N3水溶液をプラズマ発生装置の設定位置より上方に上昇
させることによりNaN3水溶液中に直接プラズマ放電を行
い、混合気体の活性化を十分ならしめる。In performing this plasma discharge method, the spiral-shaped spun provided in the introduction tube is rotated to contain Na containing the mixed gas.
By raising the N 3 aqueous solution above the set position of the plasma generator, plasma discharge is performed directly in the NaN 3 aqueous solution to sufficiently activate the mixed gas.
このようにして処理されたNOXガスはN2ガスとして反
応筒に設けられた排気口からN2として排出する。Treated in this way was NO X gas is discharged as N 2 from the exhaust port provided in the reaction tube as a N 2 gas.
F.実施例 以下、本発明を図面に示す実施例に基づいて説明す
る。F. Embodiment Hereinafter, the present invention will be described based on an embodiment shown in the drawings.
ここで第１図は本発明の一実施例を示すスクラバー方
式とプラズマ放電方式が一体化したNOXガスの処理装置
の概略構成図である。Wherein FIG. 1 is a schematic configuration diagram of a processing device of the NO X gas scrubber system and plasma discharge type are integrated showing an embodiment of the present invention.
（Ａ） この構成図において、１はスクラバー方式の反
応筒、２はNOX及び酸素の混合気体を導入する導入管、
３及び４はフランジ部、５はプラズマ発生管、６は管５
を押えるストッパー、７は混合気体吹き出しユニット、
８は混合気体の吹き出し穴、９はらせん階段状に形成さ
れたハネ、10はアース、11は電線端子導入口、12はプラ
ズマ発生電源、13はN2の排気口、14はNO2ガス濃度測定
器、Ａは高周波電極をそれぞれ示す。(A) In this configuration diagram, 1 is a scrubber type reaction tube, 2 is an introduction pipe for introducing a mixed gas of NO X and oxygen,
3 and 4 are flange portions, 5 is a plasma generating tube, 6 is a tube 5
, A stopper for holding the mixture, 7 is a mixed gas blowing unit,
8 blowing holes of the gas mixture, 9 helical blades which are formed stepwise, 10 is ground, 11 wire terminal inlet, 12 a plasma generation power source, 13 of N 2 outlet, 14 NO 2 gas concentration A measuring instrument and A indicate high frequency electrodes, respectively.
（Ｂ） まず、スクラバー方式のNOXガス処理装置に
ついて説明する。反応筒１はNOXガス処理に際し、酸性
条件下でNaN3を溶解した水溶液を投入すること及びプラ
ズマ放電等を考慮してステンレスなどの金属で作製され
ており、反応効率等から円筒型が好ましい。(B) will be described first NO X gas treatment apparatus of the scrubber type. In the reaction tube 1 is NO X gas treatment, considering that and the plasma discharge or the like to introduce the aqueous solution of NaN 3 under acidic conditions are made of metal such as stainless steel, the cylindrical form is preferred from the reaction efficiency, etc. .
また、この反応筒１内にはその上部はNOX及び酸素の
混合気体を導入する導入管２が連結されフランジ部３で
接続され、その下部はフランジ部４で接続されている。
更に、反応筒１内でかつ導入管２の間にプラズマ発生管
５が設けられており、この管５は後述するハネ９をこの
管内で回転させることを考慮して、ガラス製でかつ円筒
状が好ましくフランジ部３に取り付けられたＬ字型直線
形状であるストッパー６で固定されている。また導入管
２の下部には取りはずし可能な混合気体吹き出しユニッ
ト７が取り付けられている。このユニット７は脱着が自
由にできるためNOXガス濃度に応じてユニット７を変え
ることで混合気体の吹き出し量を調節できる。即ちこの
ユニット７はその底部に混合気体の吹き出し穴８が開け
てある構造をなし、この穴の径を変えることで混合気体
の吹き出し量が調節できる。また、導入管の先端のやや
上方かららせん階段状に形成されたハネ９が設けられて
おり、管５の内側にぴったり入り込む構造になってい
る。このような構造にすることで、混合気体が吹き出し
ユニット７を通じて吹き出され、ハネを回転することで
混合気体をハネに沿って上昇させ、反応筒１内のNaN3水
溶液と管５内で接触反応を十分行わせることができる。An upper part of the reaction tube 1 is connected to an introduction pipe 2 for introducing a mixed gas of NO X and oxygen, and is connected by a flange part 3, and a lower part thereof is connected by a flange part 4.
Further, a plasma generating tube 5 is provided in the reaction tube 1 and between the introducing tube 2. The tube 5 is made of glass and has a cylindrical shape in consideration of rotating a splash 9 described later in this tube. Are fixed by a stopper 6 which is preferably attached to the flange 3 and has an L-shaped linear shape. A removable gaseous gas blowing unit 7 is attached to the lower part of the introduction pipe 2. The unit 7 can adjust the exhaust-gas mixture by changing the unit 7 according to the NO X gas concentration for desorption can freely. That is, the unit 7 has a structure in which a mixed gas blowing hole 8 is formed at the bottom thereof, and the blowing amount of the mixed gas can be adjusted by changing the diameter of the hole. In addition, a sprinkle 9 formed in a spiral step shape from a little above the tip of the introduction tube is provided, and has a structure to fit into the inside of the tube 5 exactly. With such a structure, the mixed gas is blown out through the blowing unit 7, and the mixed gas is lifted up along the splash by rotating the splash. The contact reaction between the NaN 3 aqueous solution in the reaction tube 1 and the tube 5 is performed. Can be performed sufficiently.
次にプラズマ放電方式のプラズマ発生装置について説
明する。Next, a plasma generator of the plasma discharge system will be described.
プラズマ発生装置はプラズマ発生管５の中間位置に円
筒状に電極Ａとして設けられている。この電極Ａにより
無声放電を行うことにより生成するプラズマは酸素と相
まって、かつアジ化化合物、例えばNaN3などと一体とな
ってNOXガスをN2とH2に分解し、ステンレスなどの金属
からなる導入管２を介してアース10を通じて放出され
る。これによりNOXガスはほぼ完全にN2とH2に分解され
る。この電極Ａはフランジ部３に設けられた電線端子導
入口11を通じて反応筒１外に設置されたプラズマ発生電
源２と接続されている。なお、この電極Ａは高周波電極
などが好ましく用いられるが、これに限定されるもので
なく、いわゆる電気エネルギーを発生しプラズマを生成
するものであればいずれを用いてもよい。The plasma generating device is provided as a cylindrical electrode A at an intermediate position of the plasma generating tube 5. Plasma generated by performing silent discharge by the electrodes A, coupled with oxygen, and azide compounds, such as NaN 3 and together decomposing NO X gas into N 2 and H 2, a metal such as stainless steel It is discharged through the earth 10 through the inlet pipe 2. As a result, the NO X gas is almost completely decomposed into N 2 and H 2 . The electrode A is connected to a plasma generation power source 2 installed outside the reaction tube 1 through an electric wire terminal inlet 11 provided in the flange portion 3. The electrode A is preferably a high-frequency electrode or the like, but is not limited thereto. Any electrode may be used as long as it generates so-called electric energy and generates plasma.
このようにして分解処理されたNOXガスはN2ガスとな
って排気口13から反応筒１外に放出される。The NO X gas thus decomposed is converted into N 2 gas and discharged from the exhaust port 13 to the outside of the reaction tube 1.
（Ｃ） 次に本発明に係るNOXガスの処理装置におけるN
OXガスの処理過程について説明する。(C) then N in the processing apparatus of the NO X gas according to the present invention
It explained O X process gas.
まず水にNaN3を溶解し、この水溶液に塩酸を添加し、
pHを３以下に調製した後、この水溶液をスクラバー方式
中の反応筒１に注入する。First, dissolve NaN 3 in water, add hydrochloric acid to this aqueous solution,
After adjusting the pH to 3 or less, this aqueous solution is injected into the reaction tube 1 in a scrubber system.
次に、この溶液中にNOXガスと酸素との混合気体を導
入管２を通じて導入し、吹き出し穴８から管５内に吹き
出す。Next, a mixed gas of NO X gas and oxygen is introduced into the solution through the introduction pipe 2, and is blown into the pipe 5 through the blow hole 8.
更に、らせん階段状に形成されたハネ９を回転させ、
混合気体をハネに沿って持ち上げ十分にNaN3溶液に拡散
しつつ、この溶液を管５の電極Ａ位置より上部まで上昇
させる。Furthermore, the sprung 9 formed in a spiral step shape is rotated,
While lifting the mixed gas along the splash and sufficiently diffusing it into the NaN 3 solution, the solution is raised above the position of the electrode A of the tube 5.
この際、電極Ａおよび導入管２の間でプラズマを無声
放電させ、NOXガスを分解処理する。At this time, by silent discharge plasma between the electrodes A and inlet tube 2, decomposing the NO X gas.
次に、分解処理されたN2ガスを排気口13から排出す
る。Next, the decomposed N 2 gas is discharged from the exhaust port 13.
G.発明の効果 （１）本発明はスクラバー方式のNOXガスの処理装置に
プラズマ放電方式を組み込むように一体的に構成されて
いる。従って本発明に係るNOXガスの処理装置はプラズ
マ効果と酸素及びNaN3の効果が一体となり一層相乗的効
果を生じ、これにより著しくNOX処理率を向上でき、か
つNOX処理装置のより一層の小型化を可能とする。G. Effect (1) The present invention is integrally formed to incorporate the plasma discharge system to the processing unit of the NO X gas scrubber system. Thus processing apparatus of the NO X gas according to the present invention further results in synergistic effects effects of plasma effect and the oxygen and NaN 3 come together, thereby can improve significantly NO X treatment rate, and more of the NO X processor Can be downsized.
（２）本発明は上述のように構成されているので、次に
記載する効果を奏する。(2) Since the present invention is configured as described above, the following effects can be obtained.
本発明に係る装置によれば、アジ化化合物を使用する
ため有害で危険なアンモニアを使用することなくNOXガ
スを低減できる。According to the apparatus of the present invention can reduce the NO X gas without the use of toxic and dangerous ammonia for using azide compound.
本発明に係る装置によれば、酸素及びプラズマが反応
促剤として働くことにより、更にこれが相まって相乗的
に働き、窒素酸化物排出基準値に比し著しくNOXを低減
できる。According to the apparatus according to the present invention, since oxygen and plasma act as reaction promoters, they further act synergistically to significantly reduce NO X as compared with the nitrogen oxide emission reference value.
本発明に係る装置によれば、還元触媒を必要としない
ことから装置全体を小型化でき、その操作も簡便化でき
る。ADVANTAGE OF THE INVENTION According to the apparatus which concerns on this invention, since a reduction catalyst is not required, the whole apparatus can be miniaturized and its operation can also be simplified.
本発明に係る装置によれば、室温でNOXガスの還元反
応が可能となり、加熱するための装置等が不要となりNO
Xガスの処理を容易に行うことができる。According to the apparatus according to the present invention enables the reduction reaction of the NO X gas at room temperature, apparatus and the like for heating is unnecessary NO
X gas can be easily processed.
第１図は本発明に係るNOXガスの処理装置の一例を示す
概略構成図、第２図は混合気体吹き出しユニットの断面
図である。 １……スクラバー方式による反応筒、２……混合気体を
導入する導入管、５……プラズマ発生管、８……混合気
体の吹き出し穴、９……らせん階段状に形成されたハ
ネ、13……N2の排気口、Ａ……高周波電極。Schematic structural view showing an example of a first figure processing apparatus of the NO X gas according to the present invention, FIG. 2 is a sectional view of a gas mixture balloon unit. DESCRIPTION OF SYMBOLS 1 ... Scrubber type reaction tube, 2 ... Introducing tube for introducing a mixed gas, 5 ... Plasma generating tube, 8 ... Blow-out hole of mixed gas, 9 ... Spiral formed in a spiral step shape, 13 ... exhaust port of the ... N 2, a ...... high-frequency electrode.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 庄子 義人 東京都品川区大崎２丁目１番17号 株式 会社明電舎内 (56)参考文献 特開 平３−270714（ＪＰ，Ａ) 特開 平３−270715（ＪＰ，Ａ) 特開 平３−270716（ＪＰ，Ａ) 特開 平３−270717（ＪＰ，Ａ) 特開 平３−232518（ＪＰ，Ａ) 特開 平２−211218（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B01D 53/34,53/56──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshito Shoko 2-1-17-1 Osaki, Shinagawa-ku, Tokyo Inside Meidensha Co., Ltd. (56) References JP-A-3-270714 (JP, A) JP-A-3-3- 270715 (JP, A) JP-A-3-270716 (JP, A) JP-A-3-270717 (JP, A) JP-A-3-232518 (JP, A) JP-A-2-211218 (JP, A) (58) Field surveyed (Int. Cl. 6 , DB name) B01D 53/34, 53/56
Claims (1)
液を投入する反応筒と、 該反応筒内に固定されプラズマ発生装置を備えたプラズ
マ発生管と、 該プラズマ発生管内に前記反応筒と連結されかつラセン
状に形成されたハネを備えたNOXと空気及び酸素から選
ばれる一種との混合気体を導入する導入管と、 前記混合気体と前記アジ化化合物を反応させて、前記NO
Xガスを還元除去するために前記反応筒に設けた排気口
と、を含むことを特徴とするNOXガスの処理装置。1. A reaction tube into which an aqueous solution in which an azide compound is dissolved under an acidic condition is charged, a plasma generation tube fixed in the reaction tube and provided with a plasma generator, and the reaction tube in the plasma generation tube. An introduction pipe for introducing a mixed gas of NO X having a connected and spirally formed splash and one selected from air and oxygen, and reacting the mixed gas with the azide compound,
Processor of the NO X gas, characterized in that it comprises a and an exhaust port provided in the reaction tube in order to reduce and remove X gas.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2068905A JP2864640B2 (en) | 1990-03-19 | 1990-03-19 | NO ▲ lower x gas processing equipment |
| KR1019910701287A KR940006400B1 (en) | 1990-02-08 | 1990-05-31 | Method and apparatus for processing nitrogen oxide gas |
| EP90908663A EP0466927B1 (en) | 1990-02-08 | 1990-05-31 | Method and apparatus for processing nitrogen oxide gas |
| CA002051627A CA2051627C (en) | 1990-02-08 | 1990-05-31 | Method and apparatus for processing nitrogen oxide gas |
| AU56772/90A AU644073B2 (en) | 1990-02-08 | 1990-05-31 | Method and apparatus for processing nitrogen oxide gas |
| PCT/JP1990/000709 WO1991012070A1 (en) | 1990-02-08 | 1990-05-31 | Method and apparatus for processing nitrogen oxide gas |
| US07/768,212 US5271915A (en) | 1990-02-08 | 1990-05-31 | Method for processing nitrogen oxide gas |
| DE69019346T DE69019346D1 (en) | 1990-02-08 | 1990-05-31 | METHOD AND DEVICE FOR TREATING STICKOXYDES. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2068905A JP2864640B2 (en) | 1990-03-19 | 1990-03-19 | NO ▲ lower x gas processing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03270713A JPH03270713A (en) | 1991-12-02 |
| JP2864640B2 true JP2864640B2 (en) | 1999-03-03 |
Family
ID=13387136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2068905A Expired - Lifetime JP2864640B2 (en) | 1990-02-08 | 1990-03-19 | NO ▲ lower x gas processing equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2864640B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479226B (en) * | 2020-11-30 | 2023-06-20 | 大连科利德半导体材料股份有限公司 | High-purity ammonia deep purification device and implementation method thereof |
-
1990
- 1990-03-19 JP JP2068905A patent/JP2864640B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03270713A (en) | 1991-12-02 |
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