JPH0610651A - Exhaust gas emission control device for diesel engine - Google Patents
Exhaust gas emission control device for diesel engineInfo
- Publication number
- JPH0610651A JPH0610651A JP16601492A JP16601492A JPH0610651A JP H0610651 A JPH0610651 A JP H0610651A JP 16601492 A JP16601492 A JP 16601492A JP 16601492 A JP16601492 A JP 16601492A JP H0610651 A JPH0610651 A JP H0610651A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- diesel engine
- electrodes
- plate electrode
- catalyst
- 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.)
- Granted
Links
- 239000003054 catalyst Substances 0.000 claims abstract description 44
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 27
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 24
- 238000000746 purification Methods 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 8
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 3
- 229910052878 cordierite Inorganic materials 0.000 abstract description 3
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 46
- 238000000034 method Methods 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- -1 hydrocarbon HC Chemical class 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052680 mordenite Inorganic materials 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 235000019621 digestibility Nutrition 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はディーゼル機関の排気ガ
ス浄化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying device for a diesel engine.
【０００２】[0002]
【従来の技術】窒素酸化物（ＮＯX）を含んだ排ガス流
中でコロナ放電を行ってＮＯXを活性化し、このガスを
活性アルミナ等の吸着性触媒体に接触させることにより
ＮＯXを除去する技術は、例えば特開昭５１−６１７１
号公報に開示されている。2. Description of the Related Art NO X is removed by corona discharge in an exhaust gas stream containing nitrogen oxides (NO X ) to activate NO X and bringing this gas into contact with an adsorbing catalyst such as activated alumina. For example, Japanese Patent Application Laid-Open No. 51-6171 discloses
It is disclosed in the publication.
【０００３】[0003]
【発明が解決しようとする課題】ディーゼル機関の場合
には、排ガス中の酸素（Ｏ2）濃度がガソリン機関に比
べて高く、この排ガス流中でコロナ放電を行なうと、Ｎ
ＯXが活性化されるとともに、Ｏ2も活性化され、Ｎ2分
子と反応してＮＯ又はＮＯ2となってしまい、ＮＯXが当
初より増加する現象が生ずる。そこで本発明は、種々の
実験の結果、Ｏ2濃度が高いディーゼル機関の排ガス流
中にハイドロカーボン（ＨＣ）を添加し、このガス流に
コロナ放電を与えると、ＨＣがＣＯ2に変換される前に
中間生成物を作り、これがＮＯXと反応してＮ2に還元さ
れることを確認し、この現象を利用するディーゼル機関
用の排ガス浄化装置を提供するものである。In the case of a diesel engine, the oxygen (O 2 ) concentration in the exhaust gas is higher than that in a gasoline engine, and if corona discharge is carried out in this exhaust gas stream, N
With O X is activated, O 2 is also activated, and reacted with N 2 molecules becomes a NO or NO 2, a phenomenon that NO X is increased from the beginning occurs. Therefore, according to the present invention, as a result of various experiments, when hydrocarbon (HC) is added to the exhaust gas flow of a diesel engine having a high O 2 concentration and corona discharge is given to this gas flow, HC is converted to CO 2. The present invention provides an exhaust gas purifying apparatus for a diesel engine, which previously makes an intermediate product, confirms that this reacts with NO x and is reduced to N 2 , and utilizes this phenomenon.
【０００４】[0004]
【課題を解決するための手段】本発明のディーゼル機関
の排気ガスの浄化装置は、基本的な手段として、排気ガ
スを導入するケーシングと、ケーシング内に配設される
１対の電極と、一方の電極に接続されてコロナ放電を発
生させる高電圧発生装置と、１対の電極間に配設される
触媒と、ケーシング内に導入される排気ガスにＮＯX還
元剤を添加する装置を備える。The exhaust gas purifying apparatus for a diesel engine of the present invention comprises, as a basic means, a casing for introducing the exhaust gas, a pair of electrodes arranged in the casing, and one of A high voltage generator connected to the electrodes for generating corona discharge, a catalyst arranged between the pair of electrodes, and a device for adding a NO x reducing agent to the exhaust gas introduced into the casing.
【０００５】[0005]
【作用】ＮＯX還元剤を添加されたディーゼル機関の排
気ガス中のＮＯXは、コロナ放電により活性化されて容
易に分解され、効果的に除去される。NO X in the exhaust gas of the action] NO X reducing agent is added to diesel engines are easily decomposed activated by corona discharge, it is effectively removed.
【０００６】[0006]
【実施例】図１は本発明の原理を示す説明図である。円
筒形の反応管１０には平板電極６０がとりつけられ、こ
の平板電極上に触媒２０が充填される。平板電極６０
は、例えば導電材料をメッシュ状に形成したものであっ
て、排気ガスＧが自由に通過し得るものである。この平
板電極６０はライン６２を介してアースされる。触媒２
０は、例えば活性アルミナ（γ−アルミナ）やＳｉＯ2
とＡｌ2Ｏ3から合成されたゼオライト系の触媒、例えば
モルデナイト（Ｈ−ＺＳＭ５）をペレット状にしたもの
である。これらの触媒は窒素酸化物の還元除去に効果が
あることは知られている。反応管１０内の触媒２０の上
部には針電極５０が配置され、針電極５０のさらに上流
側には炭化水素ＨＣの供給装置３０が設けられる。FIG. 1 is an explanatory view showing the principle of the present invention. A flat plate electrode 60 is attached to the cylindrical reaction tube 10, and the catalyst 20 is filled on the flat plate electrode. Flat plate electrode 60
Is, for example, a conductive material formed in a mesh shape, through which the exhaust gas G can freely pass. The plate electrode 60 is grounded via the line 62. Catalyst 2
0 is, for example, activated alumina (γ-alumina) or SiO 2
And a zeolite catalyst synthesized from Al 2 O 3 and mordenite (H-ZSM5) in the form of pellets. It is known that these catalysts are effective in reducing and removing nitrogen oxides. A needle electrode 50 is arranged above the catalyst 20 in the reaction tube 10, and a hydrocarbon HC supply device 30 is provided further upstream of the needle electrode 50.
【０００７】針電極５０は、ライン４２を介して高電圧
発生装置４０に連結される。高電圧発生装置４０は、例
えば、ロータリーギャップ方式により高電圧波形を発生
させるもので、図３に示すような高電圧のパルス波形を
発生させる。波形は、例えば１０〜２０ＫＶのピーク値
で５００ヘルツ程度のものとなる。このパルス電圧波形
を与えられた針状電極５０は、コロナ放電５５を発生さ
せる。ディーゼル機関の排ガスに相当する模擬ガスＧを
反応管１０に流し、炭化水素ＨＣを添加したガス流中に
コロナ放電５５を発生させて、ガス流中のＮＯXの除去
状態を実験した。Needle electrode 50 is connected to high voltage generator 40 via line 42. The high voltage generator 40 generates a high voltage waveform by a rotary gap method, for example, and generates a high voltage pulse waveform as shown in FIG. The waveform has a peak value of, for example, 10 to 20 KV and is about 500 hertz. The needle electrode 50 to which this pulse voltage waveform is applied causes corona discharge 55. A simulated gas G corresponding to the exhaust gas of a diesel engine was caused to flow through the reaction tube 10, a corona discharge 55 was generated in the gas flow to which hydrocarbon HC was added, and the removal state of NO X in the gas flow was tested.
【０００８】図５は横軸に放電エネルギーを、縦軸にＮ
ＯXの浄化率をとったときのグラフであって、排ガス温
度により差はあるもののＮＯXが効率よく除去できるこ
とが判明した。なお、コロナ放電を発生させる高電圧の
波形は、図４に示す交流電圧でもよい。交流電圧は、例
えばインバーターを用いて１０〜２０キロヘルツの交流
波形を得る。パルス電圧や交流電圧によるコロナ放電
は、従来の直流方式の放電に比べて安定性が高い効果が
ある。図１に示す針電極５０の触媒２０に対する配設高
さＨは、反応管１０内径寸法Ｄにより小さい値とするこ
とがよいのは、実験により確認された。また、針電極と
平板電極との極性は反対にしてもよい。In FIG. 5, the horizontal axis represents discharge energy and the vertical axis represents N.
It is a graph when the purification rate of O x is taken, and it was found that NO x can be efficiently removed although there is a difference depending on the exhaust gas temperature. The waveform of the high voltage that causes the corona discharge may be the AC voltage shown in FIG. The AC voltage obtains an AC waveform of 10 to 20 kilohertz using, for example, an inverter. Corona discharge using a pulse voltage or an AC voltage has an effect of higher stability than the conventional DC discharge. It has been confirmed by experiments that the disposition height H of the needle electrode 50 shown in FIG. 1 with respect to the catalyst 20 should be smaller than the inner diameter dimension D of the reaction tube 10. Moreover, the polarities of the needle electrode and the plate electrode may be opposite.
【０００９】次に、図２に示す他の実施例においては、
反応管１０内に２枚の平板電極７０、６０を配設し、こ
の平板電極の間にペレット状の触媒２０を充填したもの
である。一方の平板電極７０をライン４２を介して高電
圧発生装置４０に接続し、排ガスＧの流入側に炭化水素
ＨＣの供給装置３０を設ける。この装置において実験を
した結果、図６に示すグラフを得た。ＮＯXの除去に顕
著な効果を示すことが確認された。Next, in another embodiment shown in FIG.
Two plate electrodes 70 and 60 are arranged in the reaction tube 10, and the pellet-shaped catalyst 20 is filled between the plate electrodes. One plate electrode 70 is connected to the high voltage generator 40 via a line 42, and the hydrocarbon HC supply device 30 is provided on the inflow side of the exhaust gas G. As a result of an experiment using this apparatus, the graph shown in FIG. 6 was obtained. It was confirmed that a remarkable effect was exerted on the removal of NO X.
【００１０】図７は以上の原理に基いて作成されたディ
ーゼル機関用の排気ガス浄化装置の第１の実施例を示
す。全体を符号１００で示す排気ガス浄化装置は、円筒
状のケーシング１１０を有し、ケーシング１１０内にハ
ニカム状の担体触媒１２０を挿入し、ガスＧの下流側を
平板電極１３０で支持する構成を有する。平板電極１３
０は例えば金網であって、ライン１３２を介してアース
される。ハニカム担体触媒１２０は、例えばコーデイラ
イト等のセラミック材をハニカム構造に成形し、活性ア
ルミナをコーティングしたものである。ケーシング１１
０内のハニカム担体触媒１２０の上流側には針状電極１
４０を設け、ライン１４２を介して高電圧発生装置１５
０のロータリースパークギャップ１５２に接続される。
炭化水素供給装置１６０は、軽油やガソリン等のタンク
に連結され、必要量の炭化水素を排気ガスＧの流れの中
に噴射する。炭化水素を混入された排気ガスは、コロナ
放電中で活性化され、触媒により反応を促進されて浄化
される。FIG. 7 shows a first embodiment of an exhaust gas purifying apparatus for a diesel engine, which is made based on the above principle. An exhaust gas purifying apparatus generally denoted by reference numeral 100 has a cylindrical casing 110, a honeycomb-shaped carrier catalyst 120 is inserted into the casing 110, and a downstream side of the gas G is supported by a plate electrode 130. . Flat plate electrode 13
Reference numeral 0 is, for example, a wire net, which is grounded via a line 132. The honeycomb carrier catalyst 120 is, for example, a ceramic material such as cordierite formed into a honeycomb structure and coated with activated alumina. Casing 11
The needle-shaped electrode 1 is provided on the upstream side of the honeycomb carrier catalyst 120 in 0.
40 is provided, and the high voltage generator 15 is connected via the line 142.
0 rotary spark gap 152.
The hydrocarbon supply device 160 is connected to a tank of light oil, gasoline or the like, and injects a necessary amount of hydrocarbon into the flow of the exhaust gas G. The exhaust gas mixed with hydrocarbons is activated in the corona discharge, and the catalyst promotes the reaction to purify the exhaust gas.
【００１１】図８は他の実施例に係る排気ガス浄化装置
１００Ａを示す。本実施例にあっては、ケーシング内に
２枚の平板電極１７０、１３０を配設し、この２枚の平
板電極１７０、１３０の間にハニカム担体触媒１２０を
挿入してある。一方の平板電極１７０をライン１７２を
介して高電圧発生装置１５０のロータリースパークギャ
ップ１５２に連結し、他方の平板電極１３０はライン１
３２を介してアースに接続する。炭化水素の供給装置１
６０を設けて排気ガスＧ中に炭化水素ＨＣを噴射するこ
とは、第１の実施例と同様である。FIG. 8 shows an exhaust gas purifying apparatus 100A according to another embodiment. In this embodiment, two flat plate electrodes 170, 130 are arranged in the casing, and the honeycomb carrier catalyst 120 is inserted between the two flat plate electrodes 170, 130. One plate electrode 170 is connected to the rotary spark gap 152 of the high voltage generator 150 via the line 172, and the other plate electrode 130 is connected to the line 1 line 1.
Connect to ground via 32. Hydrocarbon feeder 1
The provision of 60 to inject the hydrocarbon HC into the exhaust gas G is the same as in the first embodiment.
【００１２】図９は、本発明の原理を利用した排気ガス
浄化装置のより具体的な構成を有する実施例である。全
体を符号２００で示す排気ガス浄化装置は、円筒状のケ
ーシング２１０を有し、排気ガスＧの導入口となる入口
側の外筒２２０と、出口側の外筒２３０が連結される。
ケーシング２１０の入口側の外筒２２０の直後には、リ
ング状の第１の絶縁部材２４０に支持された第１の平板
電極２５０が配設される。第１の絶縁部材２４０は、例
えば碍子によりつくられリング状の外周部には凹部が設
けられる。平板電極２５０は例えばステンレスの金網が
用いられる。第１の絶縁部材は、導電材料製のケーシン
グに設けた穴に挿入されるピン状の絶縁部材２６０と、
ボルト・ナット２７０を利用してケーシング２１０の内
部に固着される。FIG. 9 shows an embodiment having a more specific structure of the exhaust gas purifying apparatus utilizing the principle of the present invention. The exhaust gas purifying apparatus generally designated by reference numeral 200 has a cylindrical casing 210, and an outer cylinder 220 on the inlet side serving as an inlet for the exhaust gas G and an outer cylinder 230 on the outlet side are connected.
Immediately after the outer cylinder 220 on the inlet side of the casing 210, a first flat plate electrode 250 supported by a ring-shaped first insulating member 240 is arranged. The first insulating member 240 is made of, for example, an insulator, and has a ring-shaped outer peripheral portion provided with a recess. As the plate electrode 250, for example, a stainless wire mesh is used. The first insulating member is a pin-shaped insulating member 260 inserted into a hole provided in a casing made of a conductive material,
The bolts and nuts 270 are used to fix the inside of the casing 210.
【００１３】第１の平板電極２５０は、導電部材である
ボルト・ナット２７０に連結され、さらに、ライン２８
０を介して高電圧発生装置５００に連結される。ケーシ
ング２１０の中央内部には第２の平板電極３２０がボル
ト・ナット３３０により固着され、第２の平板電極３２
０Ｈライン３４０を介してグランドに連結される。第１
の絶縁部材２４０と第２の平板電極３２０との間には、
緩衝材３１０を外周部に設けた第１のハニカム担体触媒
３００が挿入される。ケーシング２１０の出口側近傍に
は、第３の平板電極３６０が第２の絶縁部材３５０によ
りとりつけられる。第３の平板電極３６０及び絶縁部材
３５０は、第１の平板電極２５０及び絶縁部材と同様の
構造を有し、ピン状の絶縁部材３７０とボルト・ナット
３８０により所定の位置に固定される。第３の平板電極
３６０はライン３９０を介して高電圧発生装置５００に
接続される。The first plate electrode 250 is connected to a bolt / nut 270, which is a conductive member, and further connected to the line 28.
0 to the high voltage generator 500. A second plate electrode 320 is fixed to the inside of the center of the casing 210 with bolts and nuts 330.
It is connected to the ground via the 0H line 340. First
Between the insulating member 240 and the second plate electrode 320 of
The first honeycomb carrier catalyst 300 provided with the buffer material 310 on the outer peripheral portion is inserted. The third plate electrode 360 is attached to the vicinity of the outlet side of the casing 210 by the second insulating member 350. The third plate electrode 360 and the insulating member 350 have the same structure as the first plate electrode 250 and the insulating member, and are fixed at predetermined positions by a pin-shaped insulating member 370 and a bolt / nut 380. The third plate electrode 360 is connected to the high voltage generator 500 via a line 390.
【００１４】第２の平板電極と第２の絶縁部材３５０の
間には、外周部に緩衝材４１０を設けた第２のハニカム
担体触媒４００が挿入される。排気ガスＧの流入外筒２
２０の上流側には、図示しないＮＯX還元剤の供給装置
が配設され、必要量の炭化水素や軽油を供給する。高電
圧発生装置５００から高圧を供給される第１の平板電極
２５０と第３の平板電極３６０は、第２の平板電極３２
０に向けてパルスコロナ又は交流状のコロナを放電す
る。コロナ放電下にあって２つのハニカム担体触媒３０
０、４００はディーゼル機関の排ガスＧ中のＮＯXを効
果的に除去する。なお、電極とハニカム担体触媒のユニ
ットを３個以上直列に配設することにより、より効果的
な排気ガス浄化装置を構成することができる。Between the second flat plate electrode and the second insulating member 350, a second honeycomb carrier catalyst 400 having a cushioning material 410 provided on the outer peripheral portion is inserted. Exhaust gas inflow outer cylinder 2
An NO X reducing agent supply device (not shown) is disposed upstream of the 20 to supply a necessary amount of hydrocarbons or light oil. The first plate electrode 250 and the third plate electrode 360 supplied with a high voltage from the high voltage generator 500 are the second plate electrode 32.
The pulse corona or AC corona is discharged toward 0. Two honeycomb carrier catalysts 30 under corona discharge
0,400 effectively removing NO X in the exhaust gas G of a diesel engine. By arranging three or more units of the electrode and the honeycomb carrier catalyst in series, a more effective exhaust gas purification device can be constructed.
【００１５】[0015]
【発明の効果】本発明は以上のように、酸素濃度が比較
的高いディーゼル機関の排気ガスに、適量の炭化水素等
のＮＯX還元剤を添加し、触媒の存在下でコロナ放電を
与えることにより、ＮＯXを効果的に浄化する装置を提
供するものである。浄化装置のケーシング内に配設され
る電極は、針状のものでも、平板のメッシュ状のもので
もよく、触媒の担体ペレット状のものでも、ハニカム状
のものでもよい。いずれの電極にあっても、ガスの流通
は容易であり排気損失は少ない。したがって、車載の浄
化装置に適する。電極と触媒からなるユニットを複数使
用することにより、高性能をもつＮＯX浄化装置を構成
することができる。As described above, the present invention provides a corona discharge in the presence of a catalyst by adding an appropriate amount of a NO x reducing agent such as hydrocarbon to the exhaust gas of a diesel engine having a relatively high oxygen concentration. According to the present invention, a device for effectively purifying NO X is provided. The electrodes arranged in the casing of the purifier may be needle-shaped, flat-plate mesh-shaped, catalyst carrier pellet-shaped, or honeycomb-shaped. Regardless of which electrode is used, the gas flow is easy and the exhaust loss is small. Therefore, it is suitable for a vehicle-mounted purification device. By using a plurality of units each including an electrode and a catalyst, it is possible to construct a NO x purification device having high performance.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の基本構造の一例を示す説明図。FIG. 1 is an explanatory diagram showing an example of a basic structure of the present invention.
【図２】本発明の基本構造の他の例を示す説明図。FIG. 2 is an explanatory diagram showing another example of the basic structure of the present invention.
【図３】パルス電圧の波形を示す説明図。FIG. 3 is an explanatory diagram showing a waveform of a pulse voltage.
【図４】交流電圧の波形を示す説明図。FIG. 4 is an explanatory diagram showing a waveform of an AC voltage.
【図５】本発明の効果を示す説明図。FIG. 5 is an explanatory diagram showing the effect of the present invention.
【図６】本発明の効果を示す説明図。FIG. 6 is an explanatory view showing the effect of the present invention.
【図７】本発明の実施例を示す説明図。FIG. 7 is an explanatory view showing an embodiment of the present invention.
【図８】本発明の他の実施例を示す説明図。FIG. 8 is an explanatory view showing another embodiment of the present invention.
【図９】排気ガス浄化装置の具体的な構造を示す説明
図。FIG. 9 is an explanatory diagram showing a specific structure of the exhaust gas purification device.
１０ 反応管 ２０ 触媒ペレット ３０ 炭化水素供給装置 ４０ 高電圧発生装置 ５０ 針電極 ５５ コロナ放電 ６０ 平板電極 10 Reaction Tube 20 Catalyst Pellet 30 Hydrocarbon Supply Device 40 High Voltage Generator 50 Needle Electrode 55 Corona Discharge 60 Plate Electrode
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年７月３０日[Submission date] July 30, 1992
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００６[Correction target item name] 0006
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００６】図１は本発明の原理を示す説明図である。
円筒形の反応管１０には平板電極６０がとりつけられ、
この平板電極上に触媒２０が充填される。平板電極６０
は、例えば導電材料をメッシュ状に形成したものであっ
て、排気ガスＧが自由に通過し得るものである。この平
板電極６０はライン６２を介してアースされる。触媒２
０は、例えば活性アルミナ（γ−アルミナ）やＳｉＯ２
とＡｌ２Ｏ３から合成されたゼオライト系の触媒、例え
ばモルデナイトやＨ−ＺＳＭ５などをペレット状にした
ものである。これらの触媒は窒素酸化物の還元除去に効
果があることは知られている。反応管１０内の触媒２０
の上部には針電極５０が配置され、針電極５０のさらに
上流側には炭化水素ＨＣの供給装置３０が設けられる。FIG. 1 is an explanatory view showing the principle of the present invention.
A flat plate electrode 60 is attached to the cylindrical reaction tube 10,
The catalyst 20 is filled on the plate electrode. Flat plate electrode 60
Is, for example, a conductive material formed in a mesh shape, through which the exhaust gas G can freely pass. The plate electrode 60 is grounded via the line 62. Catalyst 2
0 is, for example, activated alumina (γ-alumina) or SiO 2
And a zeolite-based catalyst synthesized from Al 2 O 3 such as mordenite or H-ZSM5 in the form of pellets. It is known that these catalysts are effective in reducing and removing nitrogen oxides. Catalyst 20 in reaction tube 10
A needle electrode 50 is disposed above the needle electrode 50, and a hydrocarbon HC supply device 30 is provided further upstream of the needle electrode 50.
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００８[Correction target item name] 0008
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００８】図５は横軸に放電エネルギーを、縦軸にＮ
Ｏｘの消化率をとったときのグラフであって、排ガス温
度により差はあるもののＮＯｘが効率よく除去できるこ
とが判明した。なお、コロナ放電を発生させる高電圧の
波形は、図４に示す交流電圧でもよい。交流電圧は、例
えばインバーターを用いて１０〜２０キロヘルツの交流
波形を得る。パルス電圧や交流電圧によるコロナ放電
は、従来の直流方式の放電に比べて安定性が高い効果が
ある。図１に示す針電極５０の触媒２０に対する配設高
さＨは、反応管１０内径寸法Ｄより小さい値とすること
がよいのは、実験により確認された。また、針電極と平
板電極との極性は反対にしてもよい。In FIG. 5, the horizontal axis represents discharge energy and the vertical axis represents N.
It is a graph when the digestibility of O x is taken, and it was found that NO x can be efficiently removed although there is a difference depending on the exhaust gas temperature. The waveform of the high voltage that causes the corona discharge may be the AC voltage shown in FIG. The AC voltage obtains an AC waveform of 10 to 20 kilohertz using, for example, an inverter. Corona discharge using a pulse voltage or an AC voltage has an effect of higher stability than the conventional DC discharge. Mounting heights of H relative to the catalyst 20 of the needle electrode 50 shown in FIG. 1, good to be a small value Ri by the reaction tube 10 inner diameter D was confirmed by experiments. Moreover, the polarities of the needle electrode and the plate electrode may be opposite.
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１０[Correction target item name] 0010
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１０】図７は以上の原理に基いて作成されたディ
ーゼル機関用の排気ガス浄化装置の第１の実施例を示
す。全体を符号１００で示す排気ガス浄化装置は、円筒
状のケーシング１１０を有し、ケーシング１１０内にハ
ニカム状の担体触媒１２０を挿入し、ガスＧの下流側を
平板電極１３０で支持する構成を有する。平板電極１３
０はケーシングと絶縁された構造を持つ、例えば金網で
あって、ライン１３２を介してアースされる。ハニカム
担体触媒１２０は、例えばコーデイライト等のセラミッ
ク材をハニカム構造に形成し、活性アルミナをコーティ
ングしたものである。ケーシング１１０内のハニカム担
体触媒１２０の上流側には針状電極１４０を設け、ライ
ン１４２を介して高電圧発生装置１５０のロータリース
パークギャップ１５２に接続される。炭化水素供給装置
１６０は、軽油やガソリン等のタンクに連結され、必要
量の炭化水素を排気ガスＧの流れの中に噴射する。炭化
水素を混入された排気ガスは、コロナ放電中で活性化さ
れ、触媒により反応を促進されて浄化される。FIG. 7 shows a first embodiment of an exhaust gas purifying apparatus for a diesel engine, which is made based on the above principle. An exhaust gas purifying apparatus generally denoted by reference numeral 100 has a cylindrical casing 110, a honeycomb-shaped carrier catalyst 120 is inserted into the casing 110, and a downstream side of the gas G is supported by a plate electrode 130. . Flat plate electrode 13
Reference numeral 0 is a wire mesh , for example, which has a structure insulated from the casing, and is grounded through a line 132. The honeycomb carrier catalyst 120 is formed by forming a ceramic material such as cordierite into a honeycomb structure and coating it with activated alumina. A needle-shaped electrode 140 is provided on the upstream side of the honeycomb carrier catalyst 120 in the casing 110, and is connected to the rotary spark gap 152 of the high voltage generator 150 via a line 142. The hydrocarbon supply device 160 is connected to a tank of light oil, gasoline or the like, and injects a necessary amount of hydrocarbon into the flow of the exhaust gas G. The exhaust gas mixed with hydrocarbons is activated in the corona discharge, and the catalyst promotes the reaction to purify the exhaust gas.
【手続補正５】[Procedure Amendment 5]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１３[Correction target item name] 0013
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１３】第１の平板電極２５０は、導電部材である
ボルト・ナット２７０に連結され、さらに、ライン２８
０を介して高電圧発生装置５００に連結される。ケーシ
ング２１０の中央内部には第２の平板電極３２０がボル
ト・ナット３３０により固着され、第２の平板電極３２
０ラインは３４０を介してグランドに連結される。な
お、第１の平板電極２５０を第２の平板電極３２０の位
置に配設して高電圧を印加し、かわりに２枚の平板電極
を平板電極２５０と３６０の位置に配置し、これをグラ
ウンドに連結する構造とすることもできる。 The first plate electrode 250 is connected to a bolt / nut 270, which is a conductive member, and further connected to the line 28.
0 to the high voltage generator 500. A second plate electrode 320 is fixed to the inside of the center of the casing 210 with bolts and nuts 330.
The 0 line is connected to the ground via 340. Na
It should be noted that the first plate electrode 250 and the second plate electrode 320 may be
Placed on the table to apply high voltage, instead of two plate electrodes
Are placed at the positions of the plate electrodes 250 and 360, and
The structure may be connected to the wound.
【手続補正６】[Procedure correction 6]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１５[Name of item to be corrected] 0015
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１５】本発明は以上のように、酸素濃度が比較的
高いディーゼル機関の排気ガスに、適量の炭化水素等の
ＮＯｘ還元剤を添加し、触媒の存在下でコロナ放電を与
えることにより、ＮＯｘを効果的に浄化する装置を提供
するものである。浄化装置のケーシング内に配設される
電極は、針状のものでも、平板のメッシュ状のものでも
よく、触媒の担体はペレット状のものでも、ハニカム状
のものでもよい。いずれの電極にあっても、ガスの流通
は容易であり排気損失は少ない。したがって、車載の浄
化装置に適する。電極と触媒からなるユニットを複数使
用することにより、高性能を持つＮＯｘ浄化装置を構成
することができる。As described above, according to the present invention, an appropriate amount of a NO x reducing agent such as hydrocarbon is added to the exhaust gas of a diesel engine having a relatively high oxygen concentration, and corona discharge is given in the presence of a catalyst, An apparatus for effectively purifying NO x is provided. The electrodes arranged in the casing of the purifier may be needle-shaped or flat mesh-shaped, and the catalyst carrier may be pellet-shaped or honeycomb-shaped. Regardless of which electrode is used, the gas flow is easy and the exhaust loss is small. Therefore, it is suitable for a vehicle-mounted purification device. By using a plurality of units each including an electrode and a catalyst, a NO x purification device having high performance can be constructed.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川窪 一郎 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内 (72)発明者 水野 彰 愛知県豊橋市北山町字東浦２番地の１ ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Kawakubo 8 Tsutana, Fujisawa City, Kanagawa Prefecture Isuzu Central Research Institute (72) Inventor Akira Mizuno 1 of 2 Higashiura, Kitayama Town, Toyohashi City, Aichi Prefecture
Claims (7)
置であって、排気ガスを導入するケーシングと、ケーシ
ング内に配設される１対の電極と、一方の電極に接続さ
れてコロナ放電を発生させる高電圧発生装置と、１対の
電極間に配設される触媒と、ケーシング内に導入される
排気ガスにＮＯX還元剤を添加する装置とを備えてなる
ディーゼル機関の排気ガス浄化装置。1. A device for purifying exhaust gas of a diesel engine, wherein a casing for introducing the exhaust gas, a pair of electrodes disposed in the casing, and one electrode connected to generate corona discharge. An exhaust gas purifying apparatus for a diesel engine, comprising: a high-voltage generating device, a catalyst disposed between a pair of electrodes, and a device for adding a NO x reducing agent to the exhaust gas introduced into the casing.
の電圧波形を発生する手段を備える請求項１記載のディ
ーゼル機関の排気ガス浄化装置。2. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the high voltage generator includes means for generating a pulsed or alternating current voltage waveform.
り構成されるか、又は２枚の平板電極により構成される
請求項１記載のディーゼル機関の排気ガス浄化装置。3. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the pair of electrodes is composed of a needle electrode and a plate electrode or is composed of two plate electrodes.
レット状の担体に担持されてなる請求項１記載のディー
ゼル機関の排気ガス浄化装置。4. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the catalyst disposed between the pair of electrodes is supported on a pellet-shaped carrier.
ニカム状の担体に担持されてなる請求項１記載のディー
ゼル機関の排気ガス浄化装置。5. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the catalyst disposed between the pair of electrodes is carried on a honeycomb carrier.
る請求項１記載のディーゼル機関の排気ガス浄化装置。6. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the NO X reducing agent is hydrocarbon or light oil.
置であって、 排気ガスを導入するケーシングと、ケーシング内の排気
ガス導入口の近傍に配設される第１の平板電極と、ケー
シング内の中央部に配設されてアースに接続される第２
の平板電極と、ケーシング内の排気ガス導出口の近傍に
配設される第３の平板電極と、第１の平板電極と第２の
平板電極の間に挿入される第１のハニカム担体触媒と、
第２の平板電極と第３の平板電極の間に挿入される第２
のハニカム担体触媒と、第１と第３の平板電極に接続さ
れる高電圧発生装置と、ケーシング内に導入される排気
ガスにＮＯX還元剤を添加する装置とを備えてなるディ
ーゼル機関の排気ガス浄化装置。7. A device for purifying exhaust gas of a diesel engine, which comprises a casing for introducing the exhaust gas, a first flat plate electrode disposed in the casing in the vicinity of the exhaust gas introduction port, and The second which is arranged in the central part and is connected to the ground
Plate electrode, a third plate electrode disposed in the vicinity of the exhaust gas outlet in the casing, and a first honeycomb carrier catalyst inserted between the first plate electrode and the second plate electrode. ,
The second inserted between the second plate electrode and the third plate electrode
Exhaust gas of a diesel engine comprising the honeycomb carrier catalyst of No. 1, a high voltage generator connected to the first and third flat plate electrodes, and a device for adding a NO x reducing agent to the exhaust gas introduced into the casing. Gas purification device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16601492A JP3207519B2 (en) | 1992-06-24 | 1992-06-24 | Exhaust gas purification device for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16601492A JP3207519B2 (en) | 1992-06-24 | 1992-06-24 | Exhaust gas purification device for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0610651A true JPH0610651A (en) | 1994-01-18 |
| JP3207519B2 JP3207519B2 (en) | 2001-09-10 |
Family
ID=15823311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16601492A Expired - Fee Related JP3207519B2 (en) | 1992-06-24 | 1992-06-24 | Exhaust gas purification device for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3207519B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999013973A1 (en) * | 1997-09-13 | 1999-03-25 | Aea Technology Plc | Reactor for processing gaseous media |
| JP2003529012A (en) * | 1999-08-23 | 2003-09-30 | マサチューセッツ インスティテュート オブ テクノロジー | Emission reduction system |
-
1992
- 1992-06-24 JP JP16601492A patent/JP3207519B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999013973A1 (en) * | 1997-09-13 | 1999-03-25 | Aea Technology Plc | Reactor for processing gaseous media |
| US6322758B1 (en) * | 1997-09-13 | 2001-11-27 | Accentus Plc | Reactor for processing gaseous media |
| JP2003529012A (en) * | 1999-08-23 | 2003-09-30 | マサチューセッツ インスティテュート オブ テクノロジー | Emission reduction system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3207519B2 (en) | 2001-09-10 |
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