JP2003106139A - Exhaust emission control device - Google Patents
Exhaust emission control deviceInfo
- Publication number
- JP2003106139A JP2003106139A JP2001301949A JP2001301949A JP2003106139A JP 2003106139 A JP2003106139 A JP 2003106139A JP 2001301949 A JP2001301949 A JP 2001301949A JP 2001301949 A JP2001301949 A JP 2001301949A JP 2003106139 A JP2003106139 A JP 2003106139A
- Authority
- JP
- Japan
- Prior art keywords
- particulate filter
- side end
- exhaust gas
- inlet side
- filter
- 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 description 16
- 239000006185 dispersion Substances 0.000 claims description 12
- 230000008929 regeneration Effects 0.000 claims description 5
- 238000011069 regeneration method Methods 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000001172 regenerating effect Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 description 21
- 230000003647 oxidation Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 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 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Of Dispersed Particles In Gases (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、排気浄化装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust emission control device.
【０００２】[0002]
【従来の技術】ディーゼルエンジンから排出されるパテ
ィキュレート（Particulate Matter：粒子状物質）は、
炭素質から成る煤と、高沸点炭化水素成分から成るＳＯ
Ｆ分（Soluble Organic Fraction：可溶性有機成分）と
を主成分とし、更に微量のサルフェート（ミスト状硫酸
成分）を含んだ組成を成すものであるが、この種のパテ
ィキュレートの低減対策としては、排気ガスが流通する
排気管の途中に、パティキュレートフィルタを装備する
ことが従来より行われている。2. Description of the Related Art Particulate Matter (Particulate Matter) emitted from a diesel engine is
Soot composed of carbonaceous matter and SO composed of high boiling hydrocarbon components
It is composed of F component (Soluble Organic Fraction) as a main component and further contains a trace amount of sulfate (mist-like sulfuric acid component), but as a measure for reducing this type of particulates, exhaust gas is used. It has been conventionally practiced to equip a particulate filter in the middle of an exhaust pipe through which gas flows.
【０００３】この種のパティキュレートフィルタは、コ
ージェライト等のセラミックから成る多孔質のハニカム
構造となっており、格子状に区画された各流路の入口が
交互に目封じされ、入口が目封じされていない流路につ
いては、その出口が目封じされるようになっており、各
流路を区画する多孔質薄壁を透過した排気ガスのみが下
流側へ排出されるようにしてある。This type of particulate filter has a porous honeycomb structure made of a ceramic such as cordierite, and the inlets of the flow passages partitioned in a grid pattern are alternately plugged, and the inlets are plugged. The outlets of the non-flow passages are configured to be plugged so that only the exhaust gas that has permeated the porous thin wall defining each flow passage is discharged to the downstream side.
【０００４】そして、排気ガス中のパティキュレート
は、前記多孔質薄壁の内側表面に捕集されて堆積するの
で、目詰まりにより排気抵抗が増加しないうちにパティ
キュレートを適宜に燃焼除去してパティキュレートフィ
ルタの再生を図る必要があるが、通常のディーゼルエン
ジンの運転状態においては、パティキュレートが自己燃
焼するほどの高い排気温度が得られる機会が少ない為、
例えばアルミナに白金を担持させたものに適宜な量のセ
リウム等の希土類元素を添加して成る酸化触媒を一体的
に担持させた触媒再生型のパティキュレートフィルタの
実用化が進められている。Since the particulates in the exhaust gas are collected and deposited on the inner surface of the porous thin wall, the particulates are appropriately burned and removed before the exhaust resistance increases due to clogging. It is necessary to regenerate the particulate filter, but in normal diesel engine operating conditions, there are few opportunities to obtain a high exhaust gas temperature that allows particulates to self-combust.
For example, a catalyst regeneration type particulate filter in which an oxidation catalyst formed by adding an appropriate amount of a rare earth element such as cerium to alumina supported by platinum is integrally supported is being put into practical use.
【０００５】即ち、このような触媒再生型のパティキュ
レートフィルタを採用すれば、捕集されたパティキュレ
ートの酸化反応が促進されて着火温度が低下し、従来よ
り低い排気温度でもパティキュレートを燃焼除去するこ
とが可能となるのである。That is, if such a catalyst regeneration type particulate filter is adopted, the oxidation reaction of the collected particulates is promoted to lower the ignition temperature, and the particulates are burned and removed even at an exhaust temperature lower than the conventional one. It becomes possible to do it.
【０００６】ただし、斯かる触媒再生型のパティキュレ
ートフィルタを採用した場合であっても、該パティキュ
レートフィルタに担持される酸化触媒には活性温度領域
があり、この活性下限温度を下まわるような排気温度で
の運転状態が続くと、酸化触媒が活性化しない為にパテ
ィキュレートが良好に燃焼除去されないという不具合が
起こり得るので、電気ヒータや燃料添加装置等を付属さ
せて強制的な加熱を行うことが検討されている。However, even when such a catalyst regenerating type particulate filter is adopted, the oxidation catalyst carried by the particulate filter has an active temperature range, which is lower than the active lower limit temperature. If the operating condition at the exhaust temperature continues, there may be a problem that the particulates are not burned and removed satisfactorily because the oxidation catalyst is not activated.Therefore, an electric heater, fuel addition device, etc. are attached to perform forced heating. Is being considered.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、電気ヒ
ータや燃料添加装置等を付属させた場合には、電気ヒー
タに通電を行うための電気系統や、燃料添加装置に燃料
を供給するための燃料系統等を新たに敷設しなければな
らず、これによりパティキュレートフィルタの再生に関
するシステムが複雑なものとなってコストが高騰すると
いう問題があり、他方、電気ヒータや燃料添加装置等に
よる強制的な加熱を行わない場合には、パティキュレー
トフィルタが短期間に目詰まりしてしまうという問題が
あった。However, when an electric heater, a fuel addition device or the like is attached, an electric system for energizing the electric heater or a fuel system for supplying fuel to the fuel addition device. Etc. must be newly laid, which complicates the system for regenerating the particulate filter and raises the cost. On the other hand, the forced heating by an electric heater or a fuel addition device is required. If not performed, there was a problem that the particulate filter would be clogged in a short period of time.
【０００８】本発明は上述の実情に鑑みてなしたもの
で、電気ヒータや燃料添加装置等の強制的な加熱手段を
不要としてコストの低減化を図ると共に、短期間での目
詰まりを確実に回避し得るようにすることを目的として
いる。The present invention has been made in view of the above-mentioned circumstances, and it is possible to reduce the cost by eliminating the forcible heating means such as an electric heater and a fuel addition device, and to reliably prevent clogging in a short period of time. The purpose is to be able to avoid it.
【０００９】[0009]
【課題を解決するための手段】本発明は、排気管の途中
に介装したフィルタケース内に触媒再生型のパティキュ
レートフィルタを装備した排気浄化装置であって、前記
フィルタケース内におけるパティキュレートフィルタの
入側端面に対し多数の連通孔を有する分散板を近接させ
て対向配置し、該分散板の各連通孔のうちの一部を前記
パティキュレートフィルタの入側端面に向け口径が漸減
するベルマウス形状にして排気ガスの流れを絞り込むノ
ズル部となるように形成したことを特徴とするものであ
る。DISCLOSURE OF THE INVENTION The present invention is an exhaust gas purification device having a catalyst regeneration type particulate filter in a filter case interposed in the middle of an exhaust pipe, the particulate filter in the filter case. A dispersion plate having a large number of communication holes is arranged close to and opposed to the inlet side end face of the bell, and a part of each of the communication holes of the dispersion plate is gradually directed toward the inlet side end face of the particulate filter. It is characterized in that it is formed in a mouth shape to serve as a nozzle portion for narrowing the flow of exhaust gas.
【００１０】而して、このようにすれば、内燃機関の軽
負荷運転時等における排気温度の低い運転状態にあって
も、フィルタケースに導入された排気ガスが分散板のノ
ズル部を通過する際に、流れを絞り込まれて集中的にパ
ティキュレートフィルタの入側端面に吹き付けられる結
果、材質的に熱伝導性が極度に低いパティキュレートフ
ィルタの入側端面に局所的な高温箇所が形成されること
になる。Thus, in this way, the exhaust gas introduced into the filter case passes through the nozzle portion of the dispersion plate even when the internal combustion engine is in a low load operating state such as during light load operation. At this time, the flow is narrowed and concentratedly sprayed on the inlet side end surface of the particulate filter, and as a result, a locally high-temperature portion is formed on the inlet side end surface of the particulate filter whose material has extremely low thermal conductivity. It will be.
【００１１】そして、この局所的な高温箇所が酸化触媒
の活性下限温度以上となってパティキュレートが酸化す
ると、これを酸化起点として前記高温箇所が酸化反応の
反応起点となり、その周囲が酸化反応熱で高温化するこ
とにより酸化反応が周辺部へ伝播してパティキュレート
フィルタ全体のパティキュレートに燃え広がる結果、パ
ティキュレートフィルタに捕集されているパティキュレ
ートが良好に燃焼除去されることになる。When the local high-temperature portion becomes higher than the lower limit temperature of the activity of the oxidation catalyst and the particulates oxidize, the high-temperature portion becomes the reaction starting point of the oxidation reaction with this as the oxidation starting point, and the surrounding area becomes the oxidation reaction heat. As a result of the increase in temperature at, the oxidation reaction propagates to the peripheral portion and spreads to the particulates of the entire particulate filter, so that the particulates trapped by the particulate filter are satisfactorily burned and removed.
【００１２】更に、本発明においては、ノズル部の先端
からパティキュレートフィルタの入側端面までの距離が
前記ノズル部の先端口径の二倍以下となるように設定さ
れていることが好ましく、このようにすれば、通常の連
通孔を通過した比較的温度の低い周囲の排気ガスが、ノ
ズル部を通過して高温化した排気ガスの流れに混合し難
くなり、ノズル部により流れを絞り込まれて高温化した
排気ガスのみがパティキュレートフィルタの入側端面に
集中的に吹き付けられることになるため、該パティキュ
レートフィルタの入側端面に局所的な高温箇所が形成さ
れ易くなる。Further, in the present invention, it is preferable that the distance from the tip of the nozzle portion to the inlet end surface of the particulate filter is set to be not more than twice the diameter of the tip of the nozzle portion. If it is set, it becomes difficult for the exhaust gas around the relatively low temperature that has passed through the normal communication hole to mix with the flow of exhaust gas that has passed through the nozzle section and has become hot, and the flow is throttled by the nozzle section Since only the converted exhaust gas is intensively blown to the entrance-side end surface of the particulate filter, a local high temperature portion is easily formed on the entrance-side end surface of the particulate filter.
【００１３】[0013]
【発明の実施の形態】以下本発明の実施の形態を図面を
参照しつつ説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１４】図１〜図３は本発明を実施する形態の一例
を示すもので、本形態例の排気浄化装置においては、図
１に示す如き自動車のディーゼルエンジン１（内燃機
関）から排気マニホールド２を介して排出された排気ガ
ス３が流通している排気管４のマフラ５内に、酸化触媒
を一体的に担持して成る触媒再生型のパティキュレート
フィルタ６を収容させた場合を例示しており、該パティ
キュレートフィルタ６を抱持するフィルタケース７がマ
フラ５の外筒を成すようになっている。FIGS. 1 to 3 show an example of an embodiment for carrying out the present invention. In an exhaust emission control device of this embodiment, a diesel engine 1 (internal combustion engine) to an exhaust manifold 2 of an automobile as shown in FIG. As an example, a case in which a catalyst regeneration type particulate filter 6 having an oxidation catalyst integrally supported therein is housed in a muffler 5 of an exhaust pipe 4 in which exhaust gas 3 discharged via The filter case 7 that holds the particulate filter 6 forms an outer cylinder of the muffler 5.
【００１５】即ち、図２に拡大して示す如く、マフラ５
の入口パイプ８と出口パイプ９との間に、多数の連通孔
１１ａ，１２ａを有する分散板１１，１２により画定さ
れた所要の大きさの収容空間１０が確保されており、こ
の収容空間１０に前記パティキュレートフィルタ６が収
容されるようになっている。That is, as shown in the enlarged view of FIG.
Between the inlet pipe 8 and the outlet pipe 9 of the above, an accommodation space 10 of a required size defined by the dispersion plates 11 and 12 having a large number of communication holes 11a and 12a is secured, and in this accommodation space 10. The particulate filter 6 is housed.
【００１６】このパティキュレートフィルタ６は、セラ
ミックから成る多孔質のハニカム構造となっており、格
子状に区画された各流路６ａの入口が交互に目封じさ
れ、入口が目封じされていない流路６ａについては、そ
の出口が目封じされるようになっており、各流路６ａを
区画する多孔質薄壁６ｂを透過した排気ガス３のみが下
流側へ排出されるようにしてある。The particulate filter 6 has a porous honeycomb structure made of ceramic, and the inlets of the channels 6a partitioned in a grid pattern are alternately plugged, and the inlet is not plugged. The outlet of the passage 6a is plugged so that only the exhaust gas 3 that has permeated through the porous thin wall 6b that defines each passage 6a is discharged to the downstream side.
【００１７】尚、フィルタケース７内において、パティ
キュレートフィルタ６は、その入側端面と出側端面の外
縁をエンドプレート１３により掛止されて軸心方向への
移動が拘束されるようになっていると共に、その外周面
部分をクッション材１４により保持されるようになって
おり、このクッション材１４の軸心方向中間位置にはシ
ール材１５が介装されて排気ガス３の迂回を阻止し得る
ようにしてある。In the filter case 7, the particulate filter 6 is configured so that the outer edges of the entrance end surface and the exit end surface of the particulate filter 6 are hooked by the end plates 13 to restrain movement in the axial direction. In addition, the outer peripheral surface portion thereof is held by the cushion material 14, and a seal material 15 is interposed at an intermediate position in the axial center of the cushion material 14 to prevent the bypass of the exhaust gas 3. Is done.
【００１８】そして、本形態例においては、図３に拡大
して示す如く、フィルタケース７内でパティキュレート
フィルタ６の入側端面に対し近接して対向配置されてい
る分散板１１の各連通孔１１ａのうちの一部が、前記パ
ティキュレートフィルタ６の入側端面に向け口径が漸減
するベルマウス形状にして排気ガス３の流れを絞り込む
ノズル部１６となるようにバーリング加工されており、
ノズル部１６の先端からパティキュレートフィルタ６の
入側端面までの距離Ｌが前記ノズル部１６の先端口径Ｄ
の二倍以下となるように設定されている。In the present embodiment, as shown in an enlarged view in FIG. 3, each communication hole of the dispersion plate 11 is disposed in the filter case 7 so as to face the entrance end surface of the particulate filter 6 closely. A part of 11a is burred so as to become a nozzle portion 16 that narrows the flow of the exhaust gas 3 in a bell mouth shape in which the diameter gradually decreases toward the entrance side end surface of the particulate filter 6.
The distance L from the tip of the nozzle portion 16 to the entrance end surface of the particulate filter 6 is the tip diameter D of the nozzle portion 16.
It is set to be less than twice.
【００１９】而して、このようにすれば、ディーゼルエ
ンジン１の軽負荷運転時等における排気温度の低い運転
状態にあっても、フィルタケース７に導入された排気ガ
ス３が分散板１１のノズル部１６を通過する際に、流れ
を絞り込まれて集中的にパティキュレートフィルタ６の
入側端面に吹き付けられる結果、材質的に熱伝導性が極
度に低いパティキュレートフィルタ６の入側端面に局所
的な高温箇所が形成されることになる。Thus, in this way, the exhaust gas 3 introduced into the filter case 7 has the nozzles of the dispersion plate 11 even when the diesel engine 1 is in a low load operating state such as during light load operation. When passing through the portion 16, the flow is narrowed and concentratedly sprayed on the inlet side end surface of the particulate filter 6, and as a result, the thermal conductivity of the particulate filter 6 is extremely low locally on the inlet side end surface of the particulate filter 6. A high temperature spot will be formed.
【００２０】即ち、分散板１１に平面的に開けられた通
常の連通孔１１ａが、見掛け上の加工直径Ｄに対し実質
的に排気ガス３の流れが通過できる有効直径ｄが縮小さ
れるのに対し、ノズル部１６では直径Ｄ0分の流路断面
積に相当する排気ガス３の流れが円滑に先端口径Ｄまで
絞り込まれてそのまま通過することになるため、ノズル
部１６の先端からは、他の連通孔１１ａよりも数倍の流
量の排気ガス３がパティキュレートフィルタ６の入側端
面に向けて吹き出されることになる。That is, although the ordinary communication hole 11a formed in the dispersion plate 11 in a plane is substantially reduced in effective diameter d through which the flow of the exhaust gas 3 can pass with respect to the apparent processing diameter D. On the other hand, in the nozzle portion 16, the flow of the exhaust gas 3 corresponding to the flow passage cross-sectional area of the diameter D 0 is smoothly narrowed down to the tip diameter D and passes through as it is. The exhaust gas 3 having a flow rate several times higher than that of the communication hole 11a is blown out toward the inlet side end surface of the particulate filter 6.
【００２１】ここで、排気ガス３の温度Ｔと、排気圧力
Ｐと、流量（体積）Ｖとには、熱力学的な下記の如き関
係式
Ｐ・Ｖ／Ｔ＝一定
が決まっており、前述した如く、ノズル部１６の出側に
おける排気ガス３の流量Ｖが大きくなれば、温度Ｔも大
きく上昇することになるのである。Here, the following relational expression P · V / T = constant thermodynamically has been determined for the temperature T of the exhaust gas 3, the exhaust pressure P, and the flow rate (volume) V. As described above, if the flow rate V of the exhaust gas 3 on the outlet side of the nozzle portion 16 increases, the temperature T also increases significantly.
【００２２】そして、パティキュレートフィルタ６の入
側端面における局所的な高温箇所が酸化触媒の活性下限
温度以上となってパティキュレートが酸化すると、これ
を酸化起点として前記高温箇所が酸化反応の反応起点と
なり、その周囲が酸化反応熱で高温化することにより酸
化反応が周辺部へ伝播してパティキュレートフィルタ６
全体のパティキュレートに燃え広がる結果、パティキュ
レートフィルタ６に捕集されているパティキュレートが
良好に燃焼除去されることになる。Then, when the local high temperature portion on the inlet side end face of the particulate filter 6 becomes higher than the lower limit temperature of the activity of the oxidation catalyst and the particulates oxidize, the high temperature portion becomes the oxidation starting point of the oxidation reaction. And the temperature of the surroundings is increased by the heat of the oxidation reaction, so that the oxidation reaction propagates to the peripheral portion and the particulate filter 6
As a result of being spread to the entire particulates, the particulates trapped by the particulate filter 6 are burned and removed favorably.
【００２３】特に本形態例で説明した如く、ノズル部１
６の先端からパティキュレートフィルタ６の入側端面ま
での距離Ｌが前記ノズル部１６の先端口径Ｄの二倍以下
となるように設定されていると、通常の連通孔１１ａを
通過した比較的温度の低い周囲の排気ガス３が、ノズル
部１６を通過して高温化した排気ガス３の流れに混合し
難くなり、ノズル部１６により流れを絞り込まれて高温
化した排気ガス３のみがパティキュレートフィルタ６の
入側端面に集中的に吹き付けられることになるため、該
パティキュレートフィルタ６の入側端面に局所的な高温
箇所が形成され易くなる。In particular, as described in this embodiment, the nozzle portion 1
If the distance L from the tip of the nozzle 6 to the inlet side end surface of the particulate filter 6 is set to be twice the tip diameter D of the nozzle portion 16 or less, the temperature which has passed through the normal communication hole 11a is relatively high. It becomes difficult for the exhaust gas 3 in the surroundings having a low temperature to mix with the flow of the exhaust gas 3 that has passed through the nozzle portion 16 and has a high temperature, and only the exhaust gas 3 that has a high temperature due to the flow being narrowed by the nozzle portion 16 has a particulate filter. Since it is intensively sprayed on the inlet side end surface of 6, the local hot spot is easily formed on the inlet side end surface of the particulate filter 6.
【００２４】従って、上記形態例によれば、ディーゼル
エンジン１の軽負荷運転時等における排気温度の低い運
転状態にあっても、排気ガス３の流れを分散板１１のノ
ズル部１６により絞り込んでパティキュレートフィルタ
６の入側端面に集中的に吹き付けることにより局所的な
高温箇所を形成し、この局所的な高温箇所を酸化反応の
反応起点としてパティキュレートフィルタ６全体に酸化
反応を伝播させ、パティキュレートフィルタ６全体の触
媒床温度を上昇させて酸化触媒を安定した活性状態に維
持することができるので、パティキュレートフィルタ６
に捕集されたパティキュレートを良好に燃焼除去するこ
とができ、これによって、電気ヒータや燃料添加装置等
の強制的な加熱手段を不要としてコストの低減化を図る
ことができると共に、パティキュレートフィルタ６の短
期間での目詰まりも確実に回避することができる。Therefore, according to the above-described embodiment, even when the diesel engine 1 is in a low load operating state such as during light load operation, the flow of the exhaust gas 3 is narrowed down by the nozzle portion 16 of the dispersion plate 11 and the pattern is reduced. A local high temperature portion is formed by intensively spraying the inlet side end surface of the particulate filter 6, and the local high temperature portion is used as a reaction starting point of the oxidation reaction to propagate the oxidation reaction to the entire particulate filter 6 and Since the catalyst bed temperature of the entire filter 6 can be raised to maintain the oxidation catalyst in a stable active state, the particulate filter 6
It is possible to satisfactorily combust and remove the particulates trapped in the particulate filter, thereby making it possible to reduce the cost by eliminating the compulsory heating means such as the electric heater and the fuel addition device, and to further reduce the particulate filter. The clogging in 6 in a short period can be surely avoided.
【００２５】尚、本発明の排気浄化装置は、上述の形態
例にのみ限定されるものではなく、フィルタケースには
必ずしもマフラの外筒を利用しなくて良いこと、その
他、本発明の要旨を逸脱しない範囲内において種々変更
を加え得ることは勿論である。The exhaust gas purifying apparatus of the present invention is not limited to the above-mentioned embodiment, and it is not always necessary to use the outer cylinder of the muffler for the filter case. It goes without saying that various changes can be made without departing from the scope.
【００２６】[0026]
【発明の効果】上記した本発明の排気浄化装置によれ
ば、内燃機関の軽負荷運転時等における排気温度の低い
運転状態にあっても、排気ガスの流れを分散板のノズル
部により絞り込んでパティキュレートフィルタの入側端
面に集中的に吹き付けることにより局所的な高温箇所を
形成し、この局所的な高温箇所を酸化反応の反応起点と
してパティキュレートフィルタ全体に酸化反応を伝播さ
せ、パティキュレートフィルタ全体の触媒床温度を上昇
させて酸化触媒を安定した活性状態に維持することがで
きるので、パティキュレートフィルタに捕集されたパテ
ィキュレートを良好に燃焼除去することができ、これに
よって、電気ヒータや燃料添加装置等の強制的な加熱手
段を不要としてコストの低減化を図ることができると共
に、パティキュレートフィルタの短期間での目詰まりも
確実に回避することができるという優れた効果を奏し得
る。According to the above-described exhaust gas purification apparatus of the present invention, the flow of exhaust gas is narrowed down by the nozzle portion of the dispersion plate even when the internal combustion engine is in a low load operating state such as during light load operation. A local high-temperature spot is formed by intensively spraying on the inlet side end surface of the particulate filter, and the local high-temperature spot is used as the reaction starting point of the oxidation reaction to propagate the oxidation reaction to the entire particulate filter. Since the temperature of the entire catalyst bed can be increased to maintain the oxidation catalyst in a stable active state, it is possible to satisfactorily burn and remove the particulates trapped in the particulate filter, and thereby the electric heater and Cost reduction can be achieved by eliminating the need for compulsory heating means such as a fuel addition device. Clogging in a short period the filter is also an excellent effect can be reliably avoided.
【図１】本発明を実施する形態の一例を示す概略図であ
る。FIG. 1 is a schematic diagram showing an example of an embodiment for carrying out the present invention.
【図２】図１のフィルタケース内の構造の詳細を示す断
面図である。FIG. 2 is a cross-sectional view showing details of the structure inside the filter case of FIG.
【図３】図２のノズル部の詳細を示す拡大図である。FIG. 3 is an enlarged view showing details of a nozzle unit in FIG.
３ 排気ガス ４ 排気管 ６ パティキュレートフィルタ ７ フィルタケース １１ 分散板 １１ａ 連通孔 １６ ノズル部 3 exhaust gas 4 exhaust pipe 6 Particulate filter 7 filter case 11 Dispersion plate 11a communication hole 16 nozzle
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０１Ｎ 3/24 Ｂ０１Ｄ 46/42 Ｂ // Ｂ０１Ｄ 46/42 53/36 １０３Ｃ Ｆターム(参考） 3G090 AA03 BA02 CB01 EA03 3G091 AA02 AA18 AB02 AB13 BA02 BA04 BA07 BA20 CA02 CA27 FA04 FB02 GA06 HB01 4D048 AA14 AB01 BB02 BB14 CC22 CC24 CD05 DA03 DA20 4D058 JA32 JB06 MA44 QA01 QA17 QA30 SA08 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) F01N 3/24 B01D 46/42 B // B01D 46/42 53/36 103C F term (reference) 3G090 AA03 BA02 CB01 EA03 3G091 AA02 AA18 AB02 AB13 BA02 BA04 BA07 BA20 CA02 CA27 FA04 FB02 GA06 HB01 4D048 AA14 AB01 BB02 BB14 CC22 CC24 CD05 DA03 DA20 4D058 JA32 JB06 MA44 QA01 QA17 QA30 SA08
Claims (2)
内に触媒再生型のパティキュレートフィルタを装備した
排気浄化装置であって、前記フィルタケース内における
パティキュレートフィルタの入側端面に対し多数の連通
孔を有する分散板を近接させて対向配置し、該分散板の
各連通孔のうちの一部を前記パティキュレートフィルタ
の入側端面に向け口径が漸減するベルマウス形状にして
排気ガスの流れを絞り込むノズル部となるように形成し
たことを特徴とする排気浄化装置。1. An exhaust gas purification device comprising a catalyst regeneration type particulate filter in a filter case interposed in the middle of an exhaust pipe, wherein a plurality of particulate filters are provided with respect to an inlet side end surface of the particulate filter in the filter case. Dispersion plates having communication holes are closely arranged to face each other, and a part of each communication hole of the dispersion plate is formed into a bell mouth shape whose diameter gradually decreases toward the inlet side end surface of the particulate filter. An exhaust emission control device, characterized in that it is formed so as to serve as a nozzle portion for narrowing down.
ィルタの入側端面までの距離が前記ノズル部の先端口径
の二倍以下となるように設定したことを特徴とする請求
項１に記載の排気浄化装置。2. The exhaust gas purification according to claim 1, wherein the distance from the tip of the nozzle portion to the inlet side end surface of the particulate filter is set to be twice the diameter of the tip of the nozzle portion or less. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001301949A JP3782698B2 (en) | 2001-09-28 | 2001-09-28 | Exhaust purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001301949A JP3782698B2 (en) | 2001-09-28 | 2001-09-28 | Exhaust purification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003106139A true JP2003106139A (en) | 2003-04-09 |
| JP3782698B2 JP3782698B2 (en) | 2006-06-07 |
Family
ID=19122281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001301949A Expired - Fee Related JP3782698B2 (en) | 2001-09-28 | 2001-09-28 | Exhaust purification device |
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| Country | Link |
|---|---|
| JP (1) | JP3782698B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005113951A1 (en) * | 2004-05-24 | 2005-12-01 | Hino Motors, Ltd. | Exhaust gas purifier |
| JP2006161728A (en) * | 2004-12-08 | 2006-06-22 | Hideaki Makita | Exhaust emission control device for internal combustion engine |
| JP2009013808A (en) * | 2007-07-02 | 2009-01-22 | Hino Motors Ltd | Exhaust emission control device |
| JP2015121140A (en) * | 2013-12-24 | 2015-07-02 | 日野自動車株式会社 | Exhaust emission control device |
| CN106224060A (en) * | 2016-09-19 | 2016-12-14 | 江阴华音陶瓷机电科技有限公司 | Catalytic regeneration type is without muffler tube type deafener |
-
2001
- 2001-09-28 JP JP2001301949A patent/JP3782698B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005113951A1 (en) * | 2004-05-24 | 2005-12-01 | Hino Motors, Ltd. | Exhaust gas purifier |
| CN100465415C (en) * | 2004-05-24 | 2009-03-04 | 日野自动车株式会社 | Exhaust gas purifier |
| US7549286B2 (en) | 2004-05-24 | 2009-06-23 | Hino Motors, Ltd. | Exhaust emission control device |
| JP2006161728A (en) * | 2004-12-08 | 2006-06-22 | Hideaki Makita | Exhaust emission control device for internal combustion engine |
| JP2009013808A (en) * | 2007-07-02 | 2009-01-22 | Hino Motors Ltd | Exhaust emission control device |
| JP2015121140A (en) * | 2013-12-24 | 2015-07-02 | 日野自動車株式会社 | Exhaust emission control device |
| CN106224060A (en) * | 2016-09-19 | 2016-12-14 | 江阴华音陶瓷机电科技有限公司 | Catalytic regeneration type is without muffler tube type deafener |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3782698B2 (en) | 2006-06-07 |
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