JPH0323307A - Exhaust gas purifying device - Google Patents
Exhaust gas purifying deviceInfo
- Publication number
- JPH0323307A JPH0323307A JP1156391A JP15639189A JPH0323307A JP H0323307 A JPH0323307 A JP H0323307A JP 1156391 A JP1156391 A JP 1156391A JP 15639189 A JP15639189 A JP 15639189A JP H0323307 A JPH0323307 A JP H0323307A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst carrier
- exhaust gas
- heater
- catalytic carrier
- exhaust
- 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
- 238000002485 combustion reaction Methods 0.000 claims abstract description 11
- 239000003054 catalyst Substances 0.000 claims description 69
- 238000000746 purification Methods 0.000 claims description 5
- 230000008929 regeneration Effects 0.000 abstract description 28
- 238000011069 regeneration method Methods 0.000 abstract description 28
- 238000012545 processing Methods 0.000 abstract description 3
- 230000003197 catalytic effect Effects 0.000 abstract 7
- 238000009413 insulation Methods 0.000 abstract 2
- 239000013078 crystal Substances 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 13
- 238000011282 treatment Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 229910010271 silicon carbide Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 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
- 230000000694 effects Effects 0.000 description 2
- 239000012784 inorganic fiber Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910021426 porous silicon Inorganic materials 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明はディーゼルエンジン等の内燃機関における排
気ガスを浄化処理する排気ガス浄化装置に関する．
［従来の技術］
従来、例えばディーゼルエンジンの排気ガスを浄化する
場合には、コージエライトによってハニカム状に形成し
た触媒担体と、その触媒担体に担持された触媒威分とを
有するフィルターをディーゼルエンジンの排気側に接続
し、このフィルターによって前記排気ガス中のカーボン
，ＮＯｘ及びＨＣ等を酸化分解するようになっている。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to an exhaust gas purification device for purifying exhaust gas from an internal combustion engine such as a diesel engine. [Prior Art] Conventionally, for example, when purifying the exhaust gas of a diesel engine, a filter having a catalyst carrier formed in a honeycomb shape of cordierite and a catalyst component supported on the catalyst carrier is used to purify the exhaust gas of the diesel engine. This filter oxidizes and decomposes carbon, NOx, HC, etc. in the exhaust gas.
［発明が解決しようとする課題］
ところが、上記のフィルターにおける触媒担体は融点（
１２００〜１３００℃）の低いコージエライトによって
形成されているため、触媒担体内に滞留したカーボンを
除去するための再生処理に際して、触媒担体の一端にて
カーボンに着火した後、その触媒担体に着火位置側から
エアを供給すると、排気ガスの不均一な燃焼が生じて、
局部的な温度上昇が生じ、再生処理を繰り返し行うと、
触媒担体が溶損して再利用が不可能になるという問題が
あった。[Problem to be solved by the invention] However, the catalyst carrier in the above filter has a melting point (
Since it is made of cordierite with a low temperature (1200-1300℃), during the regeneration process to remove the carbon accumulated in the catalyst carrier, after the carbon is ignited at one end of the catalyst carrier, the catalyst carrier is placed on the ignition position side. If air is supplied from the
If a local temperature rise occurs and the regeneration process is repeated,
There was a problem in that the catalyst carrier was eroded and could not be reused.
上記の問題を解決するため、触媒担体として耐熱性及び
熱伝導性に優れた炭化珪素焼結体を使用することがすで
に提案されている。ところが、この場合には、材料の熱
伝導性が高すぎるため、従来から利用されている熱源と
して、例えば、エンジンからの排ガスの熱風又は、触媒
担体の端部に設けられた電気ヒーターがあるが、これら
の熱源を使用した場合、前記炭化珪素焼結体製担体を十
分に高温に加熱することができず、再生処理が不可能と
なったり、不完全になったりした。従って、再生を完全
に行うためには、より大容量の熱源が必要となり、電気
ヒーターの場合には大形のヒーターを利用するか、ある
いは、長時間の通電が必要となる。この場合、ヒーター
用バッテリの寿命が短くなったり、コストアンプを招く
という問題があった．
又、大容量の熱源を用いて再生処理を行うと、触媒担体
が炭化珪素焼結体製であっても、温度分布が生じ易く、
そのため再生処理を繰り返し行う内に、触媒担体にクラ
ックが発生し、そのクラックから触媒担体全体が破損し
て、上記の問題を解決するには至らなかった．
そこで、本発明者らは、再生処理における炭化珪素焼結
体製触媒担体の熱収支を検討したところ、前記触媒担体
の場合には担体自体を加熱するのに必要な熱量と、担体
を通過する排気ガスに失う熱量とが比較的少なく、相当
の熱量が触媒担体の径方向、すなわち、担体の外周にあ
るケーシングに伝わっていることが解明された。In order to solve the above problems, it has already been proposed to use a silicon carbide sintered body having excellent heat resistance and thermal conductivity as a catalyst carrier. However, in this case, the thermal conductivity of the material is too high, so conventionally used heat sources include, for example, hot air from the exhaust gas from the engine or an electric heater installed at the end of the catalyst carrier. When these heat sources were used, the silicon carbide sintered body carrier could not be heated to a sufficiently high temperature, and the regeneration process became impossible or incomplete. Therefore, in order to perform complete regeneration, a heat source with a larger capacity is required, and in the case of an electric heater, it is necessary to use a large heater or to apply electricity for a long time. In this case, there were problems such as shortening the life of the heater battery and increasing costs. In addition, when regeneration treatment is performed using a large-capacity heat source, temperature distribution tends to occur even if the catalyst carrier is made of sintered silicon carbide.
As a result, as the regeneration process was repeated, cracks appeared in the catalyst carrier, and the entire catalyst carrier was damaged from the cracks, making it impossible to solve the above problem. Therefore, the present inventors investigated the heat balance of the catalyst carrier made of sintered silicon carbide in the regeneration process, and found that in the case of the catalyst carrier, the amount of heat required to heat the carrier itself and the amount of heat that passes through the carrier. It has been found that the amount of heat lost to the exhaust gas is relatively small, and a considerable amount of heat is transmitted in the radial direction of the catalyst carrier, that is, to the casing on the outer periphery of the carrier.
この発明は上記の事情を考慮してなされたものであって
、その目的は再生処理中における触媒担体からの熱伝導
に伴う熱損失を防止し、安定した完全な再生を行い、か
つ、担体の所定部分間の温度差を少なくして、クランク
の発生に起因する触媒担体の破損を確実に防止すること
ができ、耐久性を向上させることが可能な排気ガス浄化
装置を提供することにある。This invention was made in consideration of the above circumstances, and its purpose is to prevent heat loss due to heat conduction from the catalyst carrier during regeneration treatment, to perform stable and complete regeneration, and to An object of the present invention is to provide an exhaust gas purification device that can reduce the temperature difference between predetermined portions, reliably prevent damage to a catalyst carrier caused by cranking, and improve durability.
［課題を解決するための手段］
上記の目的を達威するため、この発明では、内燃機関の
排気側に連通ずる通路を備えたケーシングと、多孔質炭
化珪素焼結体によってハニカム状に形成されると共に通
路内に配設された触媒担体と、触媒担体の外周に配設さ
れたヒーターと、そのヒーターと通路の内壁との間に配
設された断熱層とを設けている。[Means for Solving the Problems] In order to achieve the above object, the present invention includes a casing provided with a passage communicating with the exhaust side of an internal combustion engine, and a porous silicon carbide sintered body formed in a honeycomb shape. The catalyst carrier includes a catalyst carrier disposed within the passage, a heater disposed around the outer periphery of the catalyst carrier, and a heat insulating layer disposed between the heater and the inner wall of the passage.
［作用］
触媒担体の再生処理に際してヒーターを動作させれば、
触媒担体が外周側から中心へ向って加熱され、触媒担体
が迅速かつ均一に加熱される。そのため、再生処理を極
めて短時間に行うことができ、触媒担体の両端部分間の
温度差を少なくして、クランクの発生を防止できる．又
、ヒーターと通路の内壁との間の熱伝達が断熱層によっ
て抑制されて触媒担体からの放熱が未然に防止され、ヒ
ーターを利用して触媒担体を十分に再生処理が可能な温
度にまで加熱することができ、しかも触媒担体内の熱伝
達を迅速に行って完全な再生を極めて短時間に行うこと
ができる．
以下、この発明を図面に従って詳細に説明する。[Function] If the heater is operated during the catalyst carrier regeneration process,
The catalyst carrier is heated from the outer circumference toward the center, and the catalyst carrier is heated quickly and uniformly. Therefore, the regeneration process can be performed in an extremely short time, and the temperature difference between both ends of the catalyst carrier can be reduced to prevent cranking. In addition, the heat transfer between the heater and the inner wall of the passage is suppressed by the heat insulating layer, preventing heat radiation from the catalyst carrier, and the catalyst carrier is heated to a temperature that allows sufficient regeneration processing using the heater. Furthermore, complete regeneration can be achieved in an extremely short time by rapid heat transfer within the catalyst carrier. Hereinafter, the present invention will be explained in detail with reference to the drawings.
第１図に示すように、排気ガス浄化装置１は金属パイプ
製のケーシング２を備え、そのケーシング２の通路２ａ
が内燃機関Ｅの排気管路Ｅａに接続されている。このケ
ーシング２内には排気ガスを浄化するための触媒担体３
が配設されている。As shown in FIG. 1, the exhaust gas purification device 1 includes a casing 2 made of metal pipe, and a passage 2a of the casing 2.
is connected to the exhaust pipe line Ea of the internal combustion engine E. Inside this casing 2 is a catalyst carrier 3 for purifying exhaust gas.
is installed.
触媒担体３は、第２図及び第３図に示すように、高い融
点（〜３０００℃）を有する多孔質炭化珪素焼結体によ
ってハニカム状に形成されると共に、全体として円柱状
をなしている。そして、この触媒担体３には軸線方向に
平行に延びる多数のガス通過孔４が形成され、各ガス通
過孔４の供給側及び排出側のいずれか一端が炭化珪素質
の小片５によって交互に封止されている。更に、触媒担
体３の各ガス通過孔４の内壁面にはシリカ膜が形戒され
、そのシリカ膜に白金族元素やその他の金属元素及びそ
の酸化物等からなる酸化触媒が担持されている。As shown in FIGS. 2 and 3, the catalyst carrier 3 is formed into a honeycomb shape by a porous silicon carbide sintered body having a high melting point (~3000° C.), and has a cylindrical shape as a whole. . A large number of gas passage holes 4 extending parallel to the axial direction are formed in this catalyst carrier 3, and one end of each gas passage hole 4 on the supply side or discharge side is alternately sealed with small pieces 5 made of silicon carbide. It has been stopped. Further, a silica film is formed on the inner wall surface of each gas passage hole 4 of the catalyst carrier 3, and an oxidation catalyst made of platinum group elements, other metal elements, their oxides, etc. is supported on the silica film.
前記触媒担休３の外周にはセラξツクヒーターよりなる
一本の再生用ヒーター６が複数回にわたって巻回され、
排気ガス供給側から排出側に近づくに従って、各巻回部
分の間隔が密にされている。A single regeneration heater 6 made of a ceramic heater is wound several times around the outer circumference of the catalyst support 3,
The intervals between the winding portions become closer as the exhaust gas supply side approaches the exhaust side.
又、ケーシング２の通路２ａ内壁には前記ヒーター６を
被覆する断熱Ｎ７が装着されている。Further, a heat insulator N7 covering the heater 6 is attached to the inner wall of the passage 2a of the casing 2.
尚、前記断熱層の種類としては、アルξナーシリケート
セラミンクファイバー．アルミナファイバー，ジルコニ
アファイバー，シリカファイバーロックウール，石綿等
の無機質ファイバー．ナイロン，ケプラー等の有機質フ
ァイバー．ウレタン等の発泡体の戒形体、又は、これら
の組合せを利用することができる．好ましくは、無機質
ファイバーを一部、又は、全体に利用する．
又、断熱層７の使用に代えて、触媒担体３とケーシング
２との間に触媒担体３のほぼ全周に及ぶ空間を形成し、
その空間内の空気によって両者３，２間の断熱を行うよ
うにしてもよい．つまり、空気層を断熱層とすることも
できる．
さて、第１図及び第２図に矢印で示すように、内燃機関
Ｅの排気ガスがケーシング２の供給側から触媒担体３に
導入されると、ガス通過孔４の壁部によって、排気ガス
中のカーボン（すす）やＨＣ等が濾過されると共に、酸
化触媒により酸化される．そして、浄化された排気ガス
が触媒担体３から排出される．
上記のように使用された触媒担体３の再生処理を行う場
合には、触媒担体３に所定量のカーボンを滞留させた状
態で、ヒーター６による触媒担体３の加熱を開始する．
そして、触媒担体３の排気ガス排出側端部の温度が所定
温度（３００〜８００℃）に達した時、ケーシング２に
燃焼促進用の二次エアの供給を開始する。上記の処理を
継続することにより、触媒担体３内のカーボンが燃焼さ
れ、触媒担体３が再生される．
そして、この発明では、触媒担体３の外周にヒーター６
を装着すると共に、触媒担体３とケーシング２の内壁と
の間にヒーター６を覆う断熱層７を装着したため、触媒
担体３の周縁部からの放熱が抑制され、触媒担体３を再
生温度まで加熱するのに要する時間を極めて短くできる
。従って、再生温度に昇温するための熱エネルギーも節
約することができる．又、触媒担体３全体が均一に加熱
されるため、触媒担体３の両端部分間の温度差が少なく
保持される．従って、部分的な温度差に起因して触媒担
体３にクラックが発生する割合を少なくでき、再生処理
回数を増加させて、耐久性を向上させることができる．
［実施例］
触媒担体３として、直径１４４ｍｍ，長さ１５２Ｕ，熱
伝導率４ ０ 〜７ ０ Ｋｃａｌ／ｍ．ｈｒ． ’Ｃ
，比熱０．２ ３ Ｋｃａｌ／ｋｇ． ’Ｃのものを
使用した．又、この触媒担体３における各ガス通過孔４
間の隔壁の厚みは０．４３■で、各ガス通過孔４はｌ平
方ｉｎ当たり、１７０個形成されている．断熱層７とし
て、０．２ Ｋｃａｌ／ｍ，ｈｒ， Ｉｃの熱伝導率を
有し、厚さが２５一のセラミックファイバーを使用した
．再生処理用セラミックスヒーターは１２Ｖ−２．５κ
―のものであって、第１図及び第２図に示すように、排
気ガス取入れ側よりも排気ガス排出側の方が密になるよ
うに触媒担体３の外周に巻回した．
第１図に示すように、上記の排気ガス浄化装置１を内燃
機関Ｅに接続して、内燃機関Ｅを作動させ、排気ガス中
のカーボンを捕集した．この捕集動作中には、排気管路
Ｅａ内の圧力を圧カセンサＰｓ及び圧電変換素子Ｐｅを
介して制御装置Ｃによって監視し、その圧力が一定値（
０．１７ Ｋｇ／一）に到達するまで、捕集動作を４１
１続した．この時、排気ガスの流量は５ ０ １／ｓｅ
ｃであり、前記一定圧力までの到達時間は約４０分とな
った。この間に補集されたカーボン量の算出に際し、触
媒担体３の容積をガス通過孔部分の総量とし、カーボン
捕集量は捕集処理の前後における重量変化に基づいて求
めた．その結果、カーボン捕集量は１５ｇｅｔとなった
．
次に、前記制御装置ＣによってスイッチＳを閉威させ、
ヒーター６への通電を開始した。それからｌＯ分後には
コンブレッサＣＯを動作させ、エア供給管Ｃａから触媒
担体３に二次エアを５０１／ｓｉｎの割合で供給した．
そして、熱電対を使用することにより、触媒担体３の中
心軸線上においてヒーター６からガス排出側（第１図の
右側）へ１１ｍ離間した位置Ｐｉ及びガス取入れ側位置
Ｐ２の温度ＴＩ，Ｔ２をそれぞれ監視した。The type of the heat insulating layer is alumina silicate ceramic fiber. Inorganic fibers such as alumina fiber, zirconia fiber, silica fiber rock wool, and asbestos. Organic fibers such as nylon and Kepler. A shape of foam such as urethane, or a combination thereof can be used. Preferably, inorganic fibers are used in part or in whole. Also, instead of using the heat insulating layer 7, a space extending almost all around the catalyst carrier 3 is formed between the catalyst carrier 3 and the casing 2,
The air in that space may be used to insulate both parts 3 and 2. In other words, the air layer can also be used as a heat insulating layer. Now, as shown by arrows in FIGS. 1 and 2, when the exhaust gas of the internal combustion engine E is introduced into the catalyst carrier 3 from the supply side of the casing 2, the wall of the gas passage hole 4 causes the exhaust gas to Carbon (soot), HC, etc. are filtered out and oxidized by the oxidation catalyst. The purified exhaust gas is then discharged from the catalyst carrier 3. When regenerating the catalyst carrier 3 used as described above, heating of the catalyst carrier 3 by the heater 6 is started with a predetermined amount of carbon retained in the catalyst carrier 3.
Then, when the temperature of the exhaust gas discharge side end of the catalyst carrier 3 reaches a predetermined temperature (300 to 800°C), supply of secondary air for combustion promotion to the casing 2 is started. By continuing the above process, the carbon in the catalyst carrier 3 is burned and the catalyst carrier 3 is regenerated. In this invention, a heater 6 is provided on the outer periphery of the catalyst carrier 3.
At the same time, a heat insulating layer 7 covering the heater 6 is installed between the catalyst carrier 3 and the inner wall of the casing 2, so that heat radiation from the periphery of the catalyst carrier 3 is suppressed and the catalyst carrier 3 is heated to the regeneration temperature. The time required for this can be extremely shortened. Therefore, the thermal energy required to raise the temperature to the regeneration temperature can also be saved. Furthermore, since the entire catalyst carrier 3 is heated uniformly, the temperature difference between both end portions of the catalyst carrier 3 is kept small. Therefore, the rate at which cracks occur in the catalyst carrier 3 due to local temperature differences can be reduced, the number of regeneration treatments can be increased, and durability can be improved. [Example] The catalyst carrier 3 had a diameter of 144 mm, a length of 152 U, and a thermal conductivity of 40 to 70 Kcal/m. hr. 'C
, specific heat 0.2 3 Kcal/kg. 'C' was used. Moreover, each gas passage hole 4 in this catalyst carrier 3
The thickness of the partition wall between them is 0.43 cm, and 170 gas passage holes 4 are formed per 1 square inch. As the heat insulating layer 7, a ceramic fiber having a thermal conductivity of 0.2 Kcal/m, hr, Ic and a thickness of 25 mm was used. Ceramic heater for reprocessing is 12V-2.5κ
As shown in Figures 1 and 2, the catalyst carrier 3 was wound around the outer periphery of the catalyst carrier 3 so that it was more densely wound on the exhaust gas outlet side than on the exhaust gas intake side. As shown in FIG. 1, the above exhaust gas purification device 1 was connected to an internal combustion engine E, and the internal combustion engine E was operated to collect carbon in the exhaust gas. During this collection operation, the pressure in the exhaust pipe Ea is monitored by the control device C via the pressure sensor Ps and the piezoelectric conversion element Pe, and the pressure is kept at a constant value (
The collection operation was repeated 41 times until reaching 0.17 Kg/1).
One in a row. At this time, the flow rate of exhaust gas is 5 0 1/sec
c, and the time required to reach the constant pressure was approximately 40 minutes. When calculating the amount of carbon collected during this time, the volume of the catalyst carrier 3 was taken as the total amount of the gas passage hole portion, and the amount of carbon collected was determined based on the weight change before and after the collection treatment. As a result, the amount of carbon collected was 15 get. Next, the control device C closes the switch S,
Power supply to the heater 6 was started. After 10 minutes, the compressor CO was operated and secondary air was supplied from the air supply pipe Ca to the catalyst carrier 3 at a rate of 501/sin.
Then, by using a thermocouple, temperatures TI and T2 at a position Pi and a position P2 on the gas intake side, which are 11 m apart from the heater 6 toward the gas discharge side (right side in FIG. 1) on the central axis of the catalyst carrier 3, are measured. I watched it.
二次エアの供給開始時において、位置Ｐ１の温度Ｔ１は
約７５０℃であった．又、ガス取入れ側位置Ｐ２の温度
Ｔ２はカーボンの燃焼終了時に急激に降下するため、ヒ
ーター６への通電開始時から温度降下時点までの時間を
再生時間とした．その結果、再生時間は７分であった。At the time of starting the supply of secondary air, the temperature T1 at position P1 was approximately 750°C. Furthermore, since the temperature T2 at the gas intake side position P2 drops rapidly when the combustion of carbon ends, the time from the start of energization to the heater 6 until the temperature drop was defined as the regeneration time. As a result, the playback time was 7 minutes.
更に、触媒担体３が破損するまで、上記の再生処理を繰
り返した。それらの結果を表ｌに示す。Furthermore, the above regeneration process was repeated until the catalyst carrier 3 was damaged. The results are shown in Table 1.
又、触媒担体３両端の各位置ＰＩ，Ｐ２における最大温
度差を併せて示す。Moreover, the maximum temperature difference at each position PI, P2 on both ends of the catalyst carrier 3 is also shown.
［比較例］
再生処理用セラミックスヒーターを触媒担体のガス排出
側端面に装着した状態で、上記各実施例と同様の再生処
理を行った．その結果を表１に示す。[Comparative Example] The same regeneration treatment as in each of the above Examples was carried out with a ceramic heater for regeneration treatment attached to the end face of the catalyst carrier on the gas discharge side. The results are shown in Table 1.
（以下、余白）
虹
実施例
比較例
ヒーター
通電時間（分） １０ １０カーボン
捕集量（ｇ八ｅ ） １５ １５再生
処理時間（分）７１０
再生処理回数（回）２０以上 ８
最大温度差（’Ｃ） ６０ ５００表１の
結果から明らかなように、比較例の触媒担体では、実施
例の触媒担体よりも再生処理に多くの時間を要している
。従って、実施例ではカーボンが効率的に燃焼している
ことがわかる。又、実施例の触媒担体では、最大温度差
が比較例のものに比べて低い値を示し、その温度差に起
因するクランクの発生頻度が少なくなって耐久性が向上
していることがわかる。(Hereafter, blank space) Rainbow Example Comparative Example Heater energization time (minutes) 10 10 Carbon collection amount (g8e) 15 15 Regeneration treatment time (minutes) 710 Regeneration treatment number (times) 20 or more 8 Maximum temperature difference (' C) 60 500 As is clear from the results in Table 1, the catalyst carrier of the comparative example requires more time for regeneration treatment than the catalyst carrier of the example. Therefore, it can be seen that carbon is burned efficiently in the examples. In addition, the catalyst carriers of the Examples showed a lower maximum temperature difference than those of the Comparative Examples, indicating that the frequency of cranking caused by the temperature difference was reduced and the durability was improved.
［発明の効果］
以上詳述したように、この発明は再生処理中における触
媒担体からの熱伝導に伴う熱損失を防止して安定した完
全な再生を行い、かつ、触媒担体の所定部分間の温度差
を少なくして、クラツクの発生に起因する触媒担体の破
損を確実に防止することができ、よって耐久性を向上さ
せることができるという優れた効果を発揮する．[Effects of the Invention] As detailed above, the present invention prevents heat loss due to heat conduction from the catalyst carrier during regeneration treatment, performs stable and complete regeneration, and It has the excellent effect of reducing temperature differences and reliably preventing damage to the catalyst carrier due to cracks, thereby improving durability.
Claims (1)
備えたケーシング（２）と、 多孔質炭化珪素焼結体によってハニカム状に形成される
と共に前記通路（２ａ）内に配設された触媒担体（３）
と、 前記触媒担体（３）の外周に配設されたヒーター（６）
と、 前記ヒーター（６）と前記通路（２ａ）の内壁との間に
配設された断熱層（７）と を設けたことを特徴とする排気ガス浄化装置。[Scope of Claims] 1. A casing (2) having a passageway (2a) communicating with the exhaust side of the internal combustion engine (E); ) Catalyst carrier (3) disposed within
and a heater (6) disposed around the outer periphery of the catalyst carrier (3).
An exhaust gas purification device comprising: a heat insulating layer (7) disposed between the heater (6) and an inner wall of the passageway (2a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1156391A JP2928540B2 (en) | 1989-06-19 | 1989-06-19 | Exhaust gas purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1156391A JP2928540B2 (en) | 1989-06-19 | 1989-06-19 | Exhaust gas purification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0323307A true JPH0323307A (en) | 1991-01-31 |
| JP2928540B2 JP2928540B2 (en) | 1999-08-03 |
Family
ID=15626718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1156391A Expired - Lifetime JP2928540B2 (en) | 1989-06-19 | 1989-06-19 | Exhaust gas purification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2928540B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05184870A (en) * | 1992-01-10 | 1993-07-27 | Tdk Corp | Deodorizer |
| US5533167A (en) * | 1992-12-15 | 1996-07-02 | Ngk Insulators, Ltd. | Honeycomb heater element having front region adapted to heat quickly |
| JP2011153713A (en) * | 1998-09-30 | 2011-08-11 | Cabot Corp | Vacuum heat insulation panel and method of manufacturing the same |
| JP2011194323A (en) * | 2010-03-19 | 2011-10-06 | Ngk Insulators Ltd | Honeycomb catalyst, and apparatus for cleaning exhaust |
| WO2012105478A1 (en) * | 2011-02-04 | 2012-08-09 | 日本碍子株式会社 | Silicon carbide material, honeycomb structure and electric-heating type catalyst carrier |
| WO2013077184A1 (en) * | 2011-11-21 | 2013-05-30 | いすゞ自動車株式会社 | Device for assisting regeneration of dpf |
| CN107013288A (en) * | 2017-03-24 | 2017-08-04 | 常州市金坛奉献橡塑有限公司 | A kind of tailed-gas treater of automobile |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58137423A (en) * | 1982-02-09 | 1983-08-15 | Ngk Spark Plug Co Ltd | Filter apparatus for exhaust gas |
| JPS6174616U (en) * | 1984-10-22 | 1986-05-20 |
-
1989
- 1989-06-19 JP JP1156391A patent/JP2928540B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58137423A (en) * | 1982-02-09 | 1983-08-15 | Ngk Spark Plug Co Ltd | Filter apparatus for exhaust gas |
| JPS6174616U (en) * | 1984-10-22 | 1986-05-20 |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05184870A (en) * | 1992-01-10 | 1993-07-27 | Tdk Corp | Deodorizer |
| US5533167A (en) * | 1992-12-15 | 1996-07-02 | Ngk Insulators, Ltd. | Honeycomb heater element having front region adapted to heat quickly |
| US5664049A (en) * | 1992-12-15 | 1997-09-02 | Ngk Insulators, Ltd. | Honeycomb heater |
| JP2011153713A (en) * | 1998-09-30 | 2011-08-11 | Cabot Corp | Vacuum heat insulation panel and method of manufacturing the same |
| JP2011194323A (en) * | 2010-03-19 | 2011-10-06 | Ngk Insulators Ltd | Honeycomb catalyst, and apparatus for cleaning exhaust |
| WO2012105478A1 (en) * | 2011-02-04 | 2012-08-09 | 日本碍子株式会社 | Silicon carbide material, honeycomb structure and electric-heating type catalyst carrier |
| CN103339087A (en) * | 2011-02-04 | 2013-10-02 | 日本碍子株式会社 | Silicon carbide material, honeycomb structure and electric-heating type catalyst carrier |
| JPWO2012105478A1 (en) * | 2011-02-04 | 2014-07-03 | 日本碍子株式会社 | Silicon carbide-based material, honeycomb structure, and electrically heated catalyst carrier |
| WO2013077184A1 (en) * | 2011-11-21 | 2013-05-30 | いすゞ自動車株式会社 | Device for assisting regeneration of dpf |
| JP2013108433A (en) * | 2011-11-21 | 2013-06-06 | Isuzu Motors Ltd | Device for assisting regeneration of dpf |
| CN107013288A (en) * | 2017-03-24 | 2017-08-04 | 常州市金坛奉献橡塑有限公司 | A kind of tailed-gas treater of automobile |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2928540B2 (en) | 1999-08-03 |
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