JP2001276573A - Exhaust gas cleaning catalyst apparatus - Google Patents
Exhaust gas cleaning catalyst apparatusInfo
- Publication number
- JP2001276573A JP2001276573A JP2000096291A JP2000096291A JP2001276573A JP 2001276573 A JP2001276573 A JP 2001276573A JP 2000096291 A JP2000096291 A JP 2000096291A JP 2000096291 A JP2000096291 A JP 2000096291A JP 2001276573 A JP2001276573 A JP 2001276573A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- passages
- reaction gas
- passage
- catalyst carrier
- 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.)
- Pending
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 49
- 238000004140 cleaning Methods 0.000 title abstract 2
- 239000007789 gas Substances 0.000 claims abstract description 70
- 239000012495 reaction gas Substances 0.000 claims abstract description 40
- 239000003638 chemical reducing agent Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 239000000376 reactant Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical group O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- 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 description 2
- 238000002407 reforming Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、透過性を有する触
媒担体の壁面を挟み一方側を浄化される排気ガスの通路
に他方側をその排気ガスと反応させる反応ガスの通路に
して排気浄化を行う排気ガス浄化触媒装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying exhaust gas with one side sandwiching the wall surface of a permeable catalyst carrier and the other side as a reaction gas passage for reacting with the exhaust gas. The present invention relates to a catalyst device for purifying exhaust gas.
【0002】[0002]
【従来の技術】従来、ディーゼル機関の排気ガス中に還
元剤を直接分散添加してNOxを還元浄化する技術とし
ては、例えば、特開平6−137136号公報および特
開平9−13956号公報等が開示されている。しか
し、このように排気ガス中に還元剤を直接分散添加する
方法では、還元剤が触媒反応場へ到達する前に排気中の
酸素による燃焼あるいは拡散等を生じ、触媒反応場での
還元剤濃度が低下する。2. Description of the Related Art Conventionally, as a technique for directly dispersing and adding a reducing agent to exhaust gas of a diesel engine to reduce and purify NOx, for example, JP-A-6-137136 and JP-A-9-13956 are disclosed. It has been disclosed. However, in such a method in which the reducing agent is directly dispersed and added to the exhaust gas, combustion or diffusion of oxygen in the exhaust gas occurs before the reducing agent reaches the catalytic reaction site, and the reducing agent concentration in the catalytic reaction site is increased. Decrease.
【0003】一方、排気ガス浄化触媒において、透過性
を有する触媒担体壁面を挟んで一方を排気ガス通路に、
反対側を反応ガス通路にし、排気ガスに反応ガスを反応
させて排気ガスを浄化する触媒を構成するのに、従来使
用されているハニカム型触媒担体構造によって排気ガス
通路および反応ガス通路を形成すると、それらの通路に
排気ガスおよび反応ガスは平行し、これらの通路へガス
を導入する導入通路が互いに入り組んで干渉する恐れが
あり、複雑な構造となって圧力損失の大きいものとなっ
てしまう。On the other hand, in an exhaust gas purifying catalyst, one of the exhaust gas purifying catalysts has an exhaust gas passage sandwiching a wall of a permeable catalyst carrier.
The opposite side is a reaction gas passage, and when forming a catalyst for purifying exhaust gas by reacting the reaction gas with the exhaust gas, the exhaust gas passage and the reaction gas passage are formed by a conventionally used honeycomb type catalyst carrier structure. The exhaust gas and the reactant gas are parallel to these passages, and the introduction passages for introducing the gas into these passages may intersect and interfere with each other, resulting in a complicated structure and a large pressure loss.
【0004】[0004]
【発明が解決しようとする課題】本発明は、上記問題点
に対処し、触媒担体壁面を挟み一方を排気ガス通路に反
対側を反応ガス通路に構成した排気ガス浄化触媒装置に
対し、排気ガスおよび反応ガスの導入通路が簡単に構成
でき、圧力損失を低くできるように構成する技術を提案
することを目的としている。SUMMARY OF THE INVENTION The present invention addresses the above-mentioned problems and provides an exhaust gas purifying catalyst apparatus having a catalyst carrier wall sandwiching one side of the exhaust gas passage opposite to a reaction gas passage. It is another object of the present invention to propose a technique in which a reaction gas introduction passage can be easily configured and pressure loss can be reduced.
【0005】[0005]
【課題を解決するための手段】本発明によれば、透過性
を有する触媒担体の壁面を挟み一方側を浄化される排気
ガスの通路に他方側をその排気ガスと反応させる反応ガ
スの通路にして排気浄化を行う排気ガス浄化触媒装置に
おいて、前記排気ガスの通路と反応ガスの通路とをそれ
ぞれ平行な複数の通路で構成し、それらの排気ガスの通
路と反応ガスの通路とが交叉するように配設して触媒担
体を構成している。According to the present invention, one side of a wall of a permeable catalyst carrier is formed as a passage for an exhaust gas to be purified and the other side is formed as a passage for a reaction gas to be reacted with the exhaust gas. In the exhaust gas purifying catalyst device that purifies the exhaust gas, the exhaust gas passage and the reactant gas passage are each constituted by a plurality of parallel passages, and the exhaust gas passage and the reactant gas passage intersect. To form a catalyst carrier.
【0006】そして、前記排気ガスの通路と反応ガスの
通路とをそれぞれ複数本並べて排気ガス層と反応ガス層
とを各複数層ずつ設け、それらの排気ガス層と反応ガス
層とを交互に積層して触媒担体を構成している。A plurality of exhaust gas passages and a plurality of reaction gas passages are arranged to provide a plurality of exhaust gas layers and a plurality of reaction gas layers, respectively, and the exhaust gas layers and the reaction gas layers are alternately laminated. Thus, the catalyst carrier is constituted.
【0007】したがって、本発明によれば、排気ガスの
通路と反応ガスの通路とが交叉するように形成されてい
るので、それぞれの通路の入口は離れ、導入通路は簡単
に構成でき、また圧力損失の低くいものにですることが
きる。Therefore, according to the present invention, since the passage of the exhaust gas and the passage of the reactant gas are formed so as to intersect with each other, the inlets of the respective passages are separated from each other, the introduction passages can be simply constructed, and the pressure is reduced. We can do something with low loss.
【0008】[0008]
【発明の実施の形態】以下、図面を参照して本発明の実
施形態を説明する。図1において、箱型の触媒ケース1
には、その内部に後記する触媒担体3が内挿されてい
る。そして、その一面には排気入口1Aが設けられてエ
ンジンからの排気ガスEが導入され、触媒担体3の排気
ガス通路を通って反対側の排気出口1Bから排出される
ように構成されている。また、排気ガスEの流れに直交
する方向に反応ガス入口1Cが設けられている。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a box-shaped catalyst case 1
, A catalyst carrier 3 described later is inserted therein. An exhaust inlet 1A is provided on one surface thereof, and exhaust gas E from the engine is introduced, and is configured to be discharged from an opposite exhaust outlet 1B through an exhaust gas passage of the catalyst carrier 3. Further, a reaction gas inlet 1C is provided in a direction orthogonal to the flow of the exhaust gas E.
【0009】触媒担体3は、図2に示すように、排気ガ
スEが流れる排気ガス層2Sと、その流れに直交して反
応ガスRが流れる反応ガス層4Sとがそれぞれ複数(図
示の例ではそれぞれ2層)交互に積層されて構成され、
各層2S、4Sは、図2には示されてないが、それぞれ
複数の通路2、4に分割されている。As shown in FIG. 2, the catalyst carrier 3 has a plurality of exhaust gas layers 2S through which the exhaust gas E flows and a plurality of reaction gas layers 4S through which the reaction gas R flows orthogonally to the flow (in the example shown in FIG. 2). (Two layers each)
Although not shown in FIG. 2, each of the layers 2S and 4S is divided into a plurality of passages 2 and 4, respectively.
【0010】そして、排気ガス通路2と、反応ガス通路
4とが表裏面に接する触媒担体3の壁面には、反応ガス
Rが透過する性質を有している例えば、微小穿孔耐熱ス
テンレス鋼板や炭化珪素あるいはコージライト等が用い
られている。[0010] The wall surface of the catalyst carrier 3 where the exhaust gas passage 2 and the reaction gas passage 4 are in contact with the front and back surfaces has a property of transmitting the reaction gas R. Silicon or cordierite is used.
【0011】図3は、反応ガスRが還元剤である窒素酸
化物(以下、NOxと記す)還元触媒の場合を示し、触
媒担体3の排気ガスEに接する面にはNOx触媒担持層
3aが形成され、還元剤(R)に接する面には還元剤改
質触媒担持層3bが形成されている。反応ガス通路4の
還元剤(R)は、還元剤改質触媒担持層3bで改質さ
れ、触媒担体3を矢印X方向に透過し、排気ガス通路2
側のNOx触媒担持層3aによって排気ガスEを還元し
NOxを浄化する。FIG. 3 shows a case in which the reaction gas R is a nitrogen oxide (hereinafter referred to as NOx) reduction catalyst as a reducing agent, and a NOx catalyst supporting layer 3a is provided on the surface of the catalyst carrier 3 in contact with the exhaust gas E. On the surface formed and in contact with the reducing agent (R), a reducing agent reforming catalyst supporting layer 3b is formed. The reducing agent (R) in the reaction gas passage 4 is reformed in the reducing agent reforming catalyst supporting layer 3b, passes through the catalyst carrier 3 in the direction of arrow X, and
The exhaust gas E is reduced by the NOx catalyst carrying layer 3a on the side to purify NOx.
【0012】図4に示す例は、排気ガス層2Sおよび反
応ガス層4Sをそれぞれ耐熱ステンレス波板P1で複数
の排気ガス通路2および反応ガス通路4に仕切り、各層
間には微小穿孔耐熱ステンレス平板P2を用いて溶接に
よって触媒担体3Aを形成している。なお、図示の例で
は、排気ガス通路2と反応ガス通路4とは投影上で直交
して流れるように示されているが、この投影上の交角は
90度に限らず適宜選んでもよい。In the example shown in FIG. 4, the exhaust gas layer 2S and the reaction gas layer 4S are each partitioned into a plurality of exhaust gas passages 2 and reaction gas passages 4 by a heat resistant stainless steel corrugated sheet P1, and a micro-perforated heat resistant stainless steel flat plate is provided between each layer. The catalyst carrier 3A is formed by welding using P2. In the illustrated example, the exhaust gas passage 2 and the reaction gas passage 4 are shown to flow orthogonally on the projection, but the intersection angle on the projection is not limited to 90 degrees and may be appropriately selected.
【0013】図5および図6には、炭化珪素またはコー
ジライトなどで成形して形成した触媒担体の例が示され
ている。図5に示すように、排気ガス層2Sおよび反応
ガス層4Sは、それぞれ並設された複数の上方開放の通
路2、4が成形されている。そして、図6に示すように
これらの排気ガス層2Sおよび反応ガス層4Sの方向を
違えて交互に重ね合わせて触媒担体3Bが構成されてい
る。なお、この場合も、交角は90度に限らず選択可能
である。FIGS. 5 and 6 show examples of catalyst carriers formed by molding with silicon carbide or cordierite or the like. As shown in FIG. 5, in the exhaust gas layer 2S and the reaction gas layer 4S, a plurality of upwardly open passages 2 and 4, which are respectively provided in parallel, are formed. As shown in FIG. 6, the catalyst carrier 3B is formed by alternately overlapping the exhaust gas layers 2S and the reaction gas layers 4S in different directions. Also in this case, the intersection angle is not limited to 90 degrees and can be selected.
【0014】[0014]
【発明の効果】本発明は、以上説明したように構成さ
れ、触媒担体は、排気ガスの通路と反応ガスの通路とが
その流れの方向が交叉するように形成され、それらの導
入口は互いに離れて配されるので、導入通路は簡単に構
成でき、圧力損失の低くいものが構成できる。したがっ
て、触媒担体壁面を挟んで排気ガスに反応ガスを反応さ
せて排気ガスを浄化する触媒、例えば、NOx還元触媒
等が圧力損失の少ない高性能、そして低価格で提供でき
る。The present invention is constructed as described above, and the catalyst carrier is formed such that the exhaust gas passage and the reaction gas passage intersect in the flow direction, and their inlets are mutually connected. Since they are arranged at a distance, the introduction passage can be simply configured, and one with low pressure loss can be configured. Therefore, a catalyst for purifying the exhaust gas by reacting the exhaust gas with the reaction gas across the catalyst carrier wall surface, for example, a NOx reduction catalyst or the like can be provided at high performance with low pressure loss and at low cost.
【図1】本発明の一実施形態を示す斜視図。FIG. 1 is a perspective view showing an embodiment of the present invention.
【図2】図1の触媒担体を説明する斜視図。FIG. 2 is a perspective view illustrating the catalyst carrier of FIG.
【図3】触媒担体の壁面を説明する断面図。FIG. 3 is a cross-sectional view illustrating a wall surface of a catalyst carrier.
【図4】触媒担体の一実施形態を示す斜視図。FIG. 4 is a perspective view showing one embodiment of a catalyst carrier.
【図5】排気ガス層および反応ガス層の別の実施形態を
示す斜視図。FIG. 5 is a perspective view showing another embodiment of the exhaust gas layer and the reaction gas layer.
【図6】図5の排気ガス層および反応ガス層で構成した
触媒担体を示す斜視図。FIG. 6 is a perspective view showing a catalyst carrier composed of the exhaust gas layer and the reaction gas layer of FIG.
1・・・触媒ケース 1A・・・排気ガス入 1B・・・排気ガス出口 1C・・・反応ガス入口 2・・・排気ガス通路 2S・・・排気ガス層 3・・・触媒担体 4・・・反応ガス通路 4S・・・反応ガス層 DESCRIPTION OF SYMBOLS 1 ... Catalyst case 1A ... Exhaust gas input 1B ... Exhaust gas outlet 1C ... Reaction gas inlet 2 ... Exhaust gas passage 2S ... Exhaust gas layer 3 ... Catalyst carrier 4 ...・ Reaction gas passage 4S ・ ・ ・ Reaction gas layer
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3G091 AA18 AB01 AB04 BA14 BA38 BA39 CA16 FB10 GA06 GA09 GA16 GA20 GB01X GB10X GB17X HA08 4D048 AA06 AB03 BB03 CA06 CA07 CC22 4G069 AA03 AA11 CA08 CA13 DA06 EA11 EE07 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)
Claims (2)
方側を浄化される排気ガスの通路に他方側をその排気ガ
スと反応させる反応ガスの通路にして排気浄化を行う排
気ガス浄化触媒装置において、前記排気ガスの通路と反
応ガスの通路とをそれぞれ平行な複数の通路で構成し、
それらの排気ガスの通路と反応ガスの通路とが交叉する
ように配設して触媒担体を構成していることを特徴とす
る排気ガス浄化触媒装置。1. An exhaust gas purifying catalyst device for purifying exhaust gas, wherein one side of a wall of a permeable catalyst carrier is sandwiched between the path of exhaust gas to be purified and the other side is a path of reaction gas for reacting with the exhaust gas. Wherein the exhaust gas passage and the reaction gas passage are each constituted by a plurality of parallel passages,
An exhaust gas purifying catalyst device characterized in that the exhaust gas passage and the reaction gas passage are arranged so as to cross each other to constitute a catalyst carrier.
をそれぞれ複数本並べた排気ガス層と反応ガス層とを各
複数層ずつ設け、それらの排気ガス層と反応ガス層とを
交互に積層して触媒担体を構成した請求項1の排気ガス
浄化触媒装置。2. A plurality of exhaust gas layers and a plurality of reaction gas layers each having a plurality of the exhaust gas passages and a plurality of reaction gas passages arranged therein, and the exhaust gas layers and the reaction gas layers are alternately arranged. The exhaust gas purifying catalyst device according to claim 1, wherein the catalyst carrier is formed by stacking.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000096291A JP2001276573A (en) | 2000-03-31 | 2000-03-31 | Exhaust gas cleaning catalyst apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000096291A JP2001276573A (en) | 2000-03-31 | 2000-03-31 | Exhaust gas cleaning catalyst apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001276573A true JP2001276573A (en) | 2001-10-09 |
Family
ID=18611080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000096291A Pending JP2001276573A (en) | 2000-03-31 | 2000-03-31 | Exhaust gas cleaning catalyst apparatus |
Country Status (1)
Country | Link |
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JP (1) | JP2001276573A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005052327A1 (en) * | 2003-11-25 | 2005-06-09 | Babcock-Hitachi Kabushiki Kaisha | Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device |
JP2006205061A (en) * | 2005-01-28 | 2006-08-10 | Babcock Hitachi Kk | Filter for removing particulate matter from exhaust gas and exhaust gas cleaning method |
-
2000
- 2000-03-31 JP JP2000096291A patent/JP2001276573A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005052327A1 (en) * | 2003-11-25 | 2005-06-09 | Babcock-Hitachi Kabushiki Kaisha | Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device |
US7655064B2 (en) * | 2003-11-25 | 2010-02-02 | Babcock-Hitachi Kabushiki Kaisha | Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device |
KR101143736B1 (en) * | 2003-11-25 | 2012-05-10 | 바브콕-히다찌 가부시끼가이샤 | Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device |
JP2006205061A (en) * | 2005-01-28 | 2006-08-10 | Babcock Hitachi Kk | Filter for removing particulate matter from exhaust gas and exhaust gas cleaning method |
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