JP5057944B2 - Exhaust aftertreatment device - Google Patents

Exhaust aftertreatment device Download PDF

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JP5057944B2
JP5057944B2 JP2007308655A JP2007308655A JP5057944B2 JP 5057944 B2 JP5057944 B2 JP 5057944B2 JP 2007308655 A JP2007308655 A JP 2007308655A JP 2007308655 A JP2007308655 A JP 2007308655A JP 5057944 B2 JP5057944 B2 JP 5057944B2
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exhaust
case
pipe
reducing agent
passage
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JP2009133228A (en
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博昭 藤田
好央 武田
智 平沼
真一 斎藤
康子 鈴木
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Mitsubishi Fuso Truck and Bus Corp
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    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

Description

本発明は、ケース内にディーゼルパティキュレートフィルタ及び還元剤を使用する選択還元ＮＯｘ触媒を有した排気後処理装置に関する。   The present invention relates to an exhaust aftertreatment device having a selective reduction NOx catalyst using a diesel particulate filter and a reducing agent in a case.

ディーゼルエンジンの排気後処理装置として、排気中に含まれるパティキュレートマター（以下ＰＭともいう）を捕集するパティキュレートフィルタ（以下ＤＰＦともいう）がある。
また、ディーゼルエンジンの排気後処理装置として、排気中に含まれる窒素酸化物（ＮＯｘ）を浄化する手段として、排気中に尿素水（ユリア水）等の還元剤を添加し加水分解により発生するアンモニア（ＮＨ３）を使用して、ＮＯｘを窒素（Ｎ２）と水（Ｈ２Ｏ）に選択還元するＮＯｘ触媒、所謂ＳＣＲ触媒が知られている。 As an exhaust aftertreatment device for a diesel engine, there is a particulate filter (hereinafter also referred to as DPF) that collects particulate matter (hereinafter also referred to as PM) contained in the exhaust gas.
In addition, as an exhaust aftertreatment device for diesel engines, as a means for purifying nitrogen oxides (NOx) contained in the exhaust, ammonia generated by hydrolysis by adding a reducing agent such as urea water (urea water) into the exhaust There is known a so-called SCR catalyst, a NOx catalyst that selectively reduces NOx to nitrogen (N 2 ) and water (H 2 O) using (NH 3 ).

この他にもディーゼルエンジンの排気通路には、ＤＰＦの排気上流側に当該ＤＰＦでのＰＭの燃焼を促進させるための酸化触媒や、ＳＣＲ触媒の排気下流側に当該ＳＣＲ触媒通過した余剰のアンモニアを浄化させるための酸化触媒等が設けられる。
そして、これらＤＰＦ、ＳＣＲ触媒、酸化触媒等を箱状のケース（ケーシング）内に収納した排気後処理装置がある（特許文献１参照）。 In addition to this, in the exhaust passage of the diesel engine, an oxidation catalyst for accelerating PM combustion in the DPF on the exhaust upstream side of the DPF, or excess ammonia that has passed through the SCR catalyst on the exhaust downstream side of the SCR catalyst. An oxidation catalyst or the like for purification is provided.
There is an exhaust aftertreatment device in which these DPF, SCR catalyst, oxidation catalyst, and the like are housed in a box-like case (casing) (see Patent Document 1).

具体的には、ケース内部を仕切壁により排気入口側と排気出口側の２室に区切り、当該２室をケース内部の一側にある折り返し部位を介して連通させ、排気入口側の室に酸化触媒及びＤＰＦを、排気出口側の室にＳＣＲ触媒及び酸化触媒を配設させた構成としている。さらに、折り返し部位に、還元剤を添加するノズルを設けている。
特開２００７−８５２４７号公報 Specifically, the inside of the case is divided into two chambers on the exhaust inlet side and the exhaust outlet side by a partition wall, and the two chambers are communicated via a folded portion on one side inside the case to oxidize the chamber on the exhaust inlet side. The catalyst and the DPF are configured such that the SCR catalyst and the oxidation catalyst are disposed in the exhaust outlet side chamber. Furthermore, the nozzle which adds a reducing agent is provided in the folding | turning site | part.
JP 2007-85247 A

しかしながら、当該特許文献１に開示された技術のように、ケース内部の折り返し部位に還元剤を添加するノズルを設けた構成では、折り返し部位はケースの端部に形成された扁平状の空間であることから通路内に還元剤を行き渡らせることが困難である上、当該ノズルとＳＣＲ触媒との間隔が短いことから、還元剤が排気中に十分に拡散されない。このため、ＳＣＲ触媒には還元剤が不均一に添加されてしまい、ＮＯｘ浄化率が低下するという問題がある。   However, as in the technique disclosed in Patent Document 1, in the configuration in which the nozzle for adding the reducing agent is provided at the folded portion inside the case, the folded portion is a flat space formed at the end of the case. For this reason, it is difficult to distribute the reducing agent in the passage, and since the distance between the nozzle and the SCR catalyst is short, the reducing agent is not sufficiently diffused into the exhaust gas. For this reason, there is a problem that the reducing agent is added non-uniformly to the SCR catalyst, and the NOx purification rate decreases.

また、当該特許文献１に開示されている別の構成では、酸化触媒及びＳＣＲ触媒を排気入口側の室に配設し、当該酸化触媒とＳＣＲ触媒との間に還元剤を添加するノズルを設けているが、このような構成でも、ノズルとＳＣＲ触媒との間隔が狭く、上記構成と同様にＳＣＲ触媒におけるＮＯｘ浄化率が低下する。
また、当該特許文献１では、ケースにおける排気入口と排気出口とが同側面に配置され近接していることから、当該ケースにおける排気入口及び排気出口のレイアウトの自由度が低く、車体への搭載性も悪化するという問題がある。 In another configuration disclosed in Patent Document 1, an oxidation catalyst and an SCR catalyst are disposed in a chamber on the exhaust inlet side, and a nozzle for adding a reducing agent is provided between the oxidation catalyst and the SCR catalyst. However, even in such a configuration, the interval between the nozzle and the SCR catalyst is narrow, and the NOx purification rate in the SCR catalyst is reduced as in the above configuration.
Further, in Patent Document 1, since the exhaust inlet and the exhaust outlet in the case are arranged on the same side surface and are close to each other, the degree of freedom in layout of the exhaust inlet and the exhaust outlet in the case is low, and mounting on the vehicle body is possible. There is also the problem of getting worse.

本発明はこのような問題を解決するためになされたもので、その目的とするところは、大型化を抑制しつつケースの構成の自由度を向上させることができるとともに、還元剤を十分に拡散させＳＣＲ触媒によるＮＯｘ浄化率を向上させることのできる排気後処理装置を提供することにある。   The present invention has been made to solve such a problem, and the object of the present invention is to improve the degree of freedom of the configuration of the case while suppressing an increase in size and to sufficiently diffuse the reducing agent. Another object of the present invention is to provide an exhaust aftertreatment device capable of improving the NOx purification rate by the SCR catalyst.

上記した目的を達成するために、請求項１の排気後処理装置では、内燃機関の排気通路に介装されるケース内部に、排気中のパティキュレートマターを捕捉するパティキュレートフィルタ及び還元剤添加手段より添加される還元剤によって排気中のＮＯｘを選択還元するＮＯｘ触媒を有した排気浄化装置であって、前記ケース内部に配設され、該ケース内部一側に形成され前記内燃機関からの排気が流入する排気流入部及び該ケース内部の他側に形成された第１の折り返し部を連通し、前記パティキュレートフィルタが内装された第１の通路と、前記ケース内部に配設され、前記第１の折り返し部及び該ケース内部の一側に形成された第２の折り返し部を連通し、内部が断面円形状の管状通路であり、当該内部に前記ケースの他側面に配設された前記還元剤添加手段から排気上流側位置で、当該内部断面中心から排気下流側へ放射状に還元剤が噴射されることで該還元剤が排気中に添加される第２の通路と、前記ケース内部に配設され、前記第２の折り返し部及び該ケース内部の他側に形成され排気が流出する排気流出部を連通し、前記ＮＯｘ触媒が内装された第３の通路とを備えたことを特徴としている。 In order to achieve the above object, in the exhaust aftertreatment device of claim 1, the particulate filter and the reducing agent adding means for capturing particulate matter in the exhaust inside the case interposed in the exhaust passage of the internal combustion engine. An exhaust gas purification apparatus having a NOx catalyst for selectively reducing NOx in exhaust gas by a reducing agent further added, wherein the exhaust gas purification apparatus is disposed inside the case and is formed on one side of the case and exhausted from the internal combustion engine. An exhaust inflow portion that flows in and a first folded portion formed on the other side of the case communicate with each other, a first passage in which the particulate filter is installed, and a first passage that is disposed inside the case. folded portion and communicating a second folded portion formed on one side of the inside of the casing, inside a tubular passageway of circular cross-section, is arranged on the other side of the case to the inside of the Wherein the exhaust upstream side position from the reducing agent addition means, a second passage in which the reducing agent by the reducing agent radially from the internal cross-sectional center to the exhaust downstream side is injection is added to the exhaust was the case A third passage that is disposed inside and communicates with the second folded portion and an exhaust outflow portion that is formed on the other side of the case and through which the exhaust flows out, and in which the NOx catalyst is internally provided. It is a feature.

上記手段を用いる本発明の請求項１の排気後処理装置によれば、内燃機関の排気通路に介装されるケース内部にディーゼルパティキュレートフェイルタ（ＤＰＦ）及び選択還元ＮＯｘ触媒（ＳＣＲ触媒）を有する排気後処理装置であって、該ケース内部に、ケース一側にあり排気が流入する排気流入部とケース他側にある第１の折り返し部とを連通しＤＰＦが内装された第１の通路と、当該第１の折り返し部とケース一側にある第２の折り返し部とを連通し還元剤が添加される第２の通路と、当該第２の折り返し部とケース他側にあり排気が流出する排気流出部とを連通しＮＯｘ触媒が内装された第３の通路とを備えている。   According to the exhaust aftertreatment device of the first aspect of the present invention using the above means, the diesel particulate filter (DPF) and the selective reduction NOx catalyst (SCR catalyst) are disposed inside the case interposed in the exhaust passage of the internal combustion engine. An exhaust aftertreatment device having a first passage in which a DPF is internally connected to communicate with an exhaust inflow portion on one side of the case where exhaust flows in and a first folded portion on the other side of the case. And a second passage through which the first folded portion and the second folded portion on one side of the case are communicated, and a reducing agent is added, and the second folded portion and the other side of the case are on the other side of the exhaust. And a third passage in which a NOx catalyst is housed is connected.

つまり、当該排気後処理装置は、ケース内部において排気流入部から順に第１の通路、第１の折り返し部、第２の通路、第２の折り返し部、第３の通路、排気流出部と排気が流れる排気経路が形成されている。そして、当該第１の通路にＤＰＦが内装し、第２の通路で還元剤が添加され、第３の通路にＳＣＲ触媒が内装されている。
このように、ケース内部に２つの折り返し部を形成し、ＤＰＦを備える第１の通路及びＳＣＲ触媒を備える第３の通路を配設するとともに、ＳＣＲ触媒の排気上流側に還元剤を添加するための第２の通路を設けることで、そして、還元剤が十分に拡散されることでＳＣＲ触媒に還元剤が均一に添加され、当該ＳＣＲ触媒におけるＮＯｘ浄化性能を向上させることができる。 That is, in the exhaust aftertreatment device, the first passage, the first folded portion, the second passage, the second folded portion, the third passage, the exhaust outflow portion, and the exhaust are sequentially arranged from the exhaust inflow portion inside the case. A flowing exhaust path is formed. A DPF is internally provided in the first passage, a reducing agent is added in the second passage, and an SCR catalyst is provided in the third passage.
Thus, in order to add the reducing agent to the exhaust upstream side of the SCR catalyst, the two folded portions are formed inside the case, the first passage including the DPF and the third passage including the SCR catalyst are disposed. By providing the second passage, and the reducing agent is sufficiently diffused, the reducing agent is uniformly added to the SCR catalyst, and the NOx purification performance of the SCR catalyst can be improved.

また、ケース内部の排気経路を２箇所で折り返した構成とすることで、排気入口がケースの一側に、排気出口がケースの他側に配置されることから、従来のように排気入口及び排気出口を近接される必要はなく、当該排気入口及び排気出口の配置の自由度を向上させることができる。これにより、車体の構造に合わせたケース構成とすることができ、当該ケースの搭載性も向上させることができる。   In addition, since the exhaust path inside the case is folded at two locations, the exhaust inlet is disposed on one side of the case and the exhaust outlet is disposed on the other side of the case. The outlets do not need to be close to each other, and the degree of freedom of arrangement of the exhaust inlet and the exhaust outlet can be improved. Thereby, it can be set as the case structure according to the structure of the vehicle body, and the mounting property of the case can also be improved.

以上のことから、大型化を抑制しつつケースの構成の自由度を向上させることができるとともに、還元剤を十分に拡散させＳＣＲ触媒によるＮＯｘ浄化率を向上させることができる。
さらに、当該請求項１の排気後処理装置によれば、還元剤添加手段をケースの他側に配設し、第２の通路内の排気上流側位置で還元剤を添加するものとしている。 From the above, it is possible to improve the degree of freedom of the configuration of the case while suppressing an increase in size, and it is possible to sufficiently diffuse the reducing agent and improve the NOx purification rate by the SCR catalyst.
Further, according to the exhaust aftertreatment device of claim 1 , the reducing agent addition means is disposed on the other side of the case, and the reducing agent is added at the exhaust upstream side position in the second passage.

このように、第２の通路内の排気上流側位置で還元剤を添加することで、当該還元剤の添加位置からＳＣＲ触媒までの間隔を十分に確保することができ、当該還元剤の拡散をより確実に促進させることができる。
また、断面円形状の第２の通路内の断面中心から還元剤添加手段により排気下流側へ放射状に還元剤を噴射することで該還元剤を排気中に添加することとしている。 Thus, by adding the reducing agent at the exhaust upstream side position in the second passage, a sufficient interval from the reducing agent addition position to the SCR catalyst can be secured, and the diffusion of the reducing agent can be reduced. It can be promoted more reliably.
Further , the reducing agent is added into the exhaust gas by injecting the reducing agent radially from the center of the cross section in the second passage having a circular cross section to the exhaust downstream side by the reducing agent addition means.

これにより、第２通路内を通る排気中に還元剤を効率よく均一に添加することができる。   Thereby, a reducing agent can be efficiently and uniformly added to the exhaust gas passing through the second passage.

以下、本発明の実施の形態を図面に基づき説明する。
図１乃至６を参照すると、図１には本発明の実施形態に係る排気後処理装置を備えた車両の上面視図、図２には本発明の実施形態に係る排気後処理装置を備えた車両の側面視図、図３には排気後処理装置の排気浄化ケースの上面視図、図４には図３のＡ−Ａ線に沿う断面図、図５には図３のＢ−Ｂ線に沿う断面図、図６には図５のＣ−Ｃ線に沿う断面図がそれぞれ示されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6, FIG. 1 is a top view of a vehicle equipped with an exhaust aftertreatment device according to an embodiment of the present invention, and FIG. 2 is equipped with an exhaust aftertreatment device according to an embodiment of the present invention. 3 is a side view of the vehicle, FIG. 3 is a top view of the exhaust purification case of the exhaust aftertreatment device, FIG. 4 is a sectional view taken along the line AA in FIG. 3, and FIG. 5 is a line BB in FIG. FIG. 6 is a sectional view taken along the line CC of FIG.

図１、２に示されるように、車両１は車体の前後方向に延びるはしご形のフレーム２の前部にキャブ４が設けられたキャブオーバトラックである。
当該フレーム２の前部にはフレーム２とキャブ４との間に位置してディーゼルエンジン６（内燃機関）が設けられている。
当該ディーゼルエンジン６からは蛇腹状の排気管８（排気通路）が車体後方へと延びており、当該排気管８は排気浄化ケース１０に接続されている。 As shown in FIGS. 1 and 2, the vehicle 1 is a cab overtrack in which a cab 4 is provided at a front portion of a ladder-shaped frame 2 extending in the front-rear direction of the vehicle body.
A diesel engine 6 (internal combustion engine) is provided at a front portion of the frame 2 between the frame 2 and the cab 4.
A bellows-like exhaust pipe 8 (exhaust passage) extends from the diesel engine 6 to the rear of the vehicle body, and the exhaust pipe 8 is connected to an exhaust purification case 10.

当該排気浄化ケース１０は、フレーム２の車両右側であってキャブ４の後方位置に搭載されている。
以下、図３乃至６に基づき排気浄化ケース１０の構成について説明する。
図３に示すように排気浄化ケース１０の上面視において、排気浄化ケース１０の内部は、車幅方向に一側領域１２、中央領域１４、他側領域１６の３領域に区画されおり、中央領域１４には一側領域１２及び他側領域１６を連通するように車幅方向に延びた第１パイプ１８（第１の通路）、第２パイプ２０（第２の通路）、第３パイプ２２（第３の通路）が配設されている。なお、第１パイプ１８及び第３パイプ２２の径は略同径をなしており、第２パイプ２０の径は当該第１パイプ１８及び第３パイプ２２より小径をなしている。 The exhaust purification case 10 is mounted on the vehicle right side of the frame 2 and at a rear position of the cab 4.
Hereinafter, the configuration of the exhaust purification case 10 will be described with reference to FIGS.
As shown in FIG. 3, in the top view of the exhaust purification case 10, the interior of the exhaust purification case 10 is partitioned into three regions of a one side region 12, a central region 14, and another side region 16 in the vehicle width direction. 14 includes a first pipe 18 (first passage), a second pipe 20 (second passage), and a third pipe 22 (extending in the vehicle width direction so as to communicate the one side region 12 and the other side region 16. A third passage) is provided. The diameters of the first pipe 18 and the third pipe 22 are substantially the same, and the diameter of the second pipe 20 is smaller than that of the first pipe 18 and the third pipe 22.

また、図４及び図５に示すように排気浄化ケース１０の側面視において、排気浄化ケース１０は、外形が上段前部及び下段後部の切り欠かれた略矩形状をなしている。そして、当該排気浄化ケース１０の内部は、側面視上段後部位置に第１パイプ１８が配設され、当該第１パイプ１８の下方位置、即ち排気浄化ケース１０の側面視中央位置に第２パイプ２０が配設され、当該第２パイプ２０の前方位置、即ち排気浄化ケース１０の側面視中段前部位置に第３パイプ２２が配設されている。   Further, as shown in FIGS. 4 and 5, in the side view of the exhaust purification case 10, the exhaust purification case 10 has a substantially rectangular shape in which the outer shape is cut out at the upper front portion and the lower rear portion. In the exhaust purification case 10, the first pipe 18 is disposed at the upper rear position in the side view, and the second pipe 20 is positioned below the first pipe 18, that is, in the center position in the side view of the exhaust purification case 10. The third pipe 22 is disposed at a front position of the second pipe 20, that is, at a position in front of the middle stage of the exhaust purification case 10.

また、排気浄化ケース１０内部には、各パイプ１８、２０、２２間及び排気浄化ケース１０下段部分を区画する区画壁２４が設けられている。なお、当該区画壁２４は排気浄化ケース１０内部の一側領域１２においては３室に、他側領域１６においては２室に区画するものである。
詳しくは、一側領域１２は区画壁２４により、第１パイプ１８と連通された排気流入室２６及び、第２パイプ２０及び第３パイプ２２と連通された一側折り返し室２８、及び一側下段室３０に区画されている。 Further, a partition wall 24 that partitions between the pipes 18, 20, 22 and a lower stage portion of the exhaust purification case 10 is provided in the exhaust purification case 10. The partition wall 24 is divided into three chambers in the one side region 12 inside the exhaust purification case 10 and two chambers in the other side region 16.
Specifically, the one-side region 12 is divided by a partition wall 24 into an exhaust inflow chamber 26 that communicates with the first pipe 18, a one-side folded chamber 28 that communicates with the second pipe 20 and the third pipe 22, and a one-side lower stage. The room 30 is partitioned.

一方、他側領域１２は区画壁２４により、第１パイプ１８及び第２パイプ２０と連通された他側折り返し室３２、第３パイプ２２と連通し及び下段部分にまで延びた排気流出室３４に区画されている。
そして、上記排気管８は排気流入室２６と連通するよう、排気浄化ケース１０の車幅方向一側の上段前部に接続されている。一方、排気流出室３４と連通するよう、排気浄化ケース１０の下段後部にアウトレットパイプ３６の一端が接続されている。なお、当該アウトレットパイプ３６は、排気浄化ケース１０の下段後部から車両後方及び車幅方向他側に向かって延び、他端は大気に開放されている。 On the other hand, the other side region 12 is separated by a partition wall 24 into the other side folding chamber 32 communicated with the first pipe 18 and the second pipe 20, and the exhaust outflow chamber 34 communicated with the third pipe 22 and extended to the lower part. It is partitioned.
The exhaust pipe 8 is connected to the upper front portion of the exhaust purification case 10 on one side in the vehicle width direction so as to communicate with the exhaust inflow chamber 26. On the other hand, one end of the outlet pipe 36 is connected to the lower rear portion of the exhaust purification case 10 so as to communicate with the exhaust outflow chamber 34. The outlet pipe 36 extends from the lower rear portion of the exhaust purification case 10 toward the rear of the vehicle and the other side in the vehicle width direction, and the other end is open to the atmosphere.

このように、排気浄化ケース１０内部における排気通路は、排気管８と連通されている排気流入室２６から、第１パイプ１８、他側折り返し室３２、第２パイプ２０、一側折り返し室２８、第３パイプ２２、アウトレットパイプ３６と連通されている排気流出室３４の順に形成されている。
また、第１パイプ１８には排気上流側である車幅方向一側に前段酸化触媒４０が、排気下流側である車幅方向他側に排気中のＰＭを捕捉するディーゼルパティキュレートフィルタ４２（以下ＤＰＦという）が内装されている。 Thus, the exhaust passage inside the exhaust purification case 10 is connected to the first pipe 18, the other side folding chamber 32, the second pipe 20, the one side folding chamber 28, from the exhaust inflow chamber 26 communicating with the exhaust pipe 8. An exhaust outlet / outlet chamber 34 communicating with the third pipe 22 and the outlet pipe 36 is formed in this order.
The first pipe 18 includes a diesel particulate filter 42 (hereinafter referred to as a diesel particulate filter 42) that captures PM in the exhaust on the other side in the vehicle width direction on the exhaust downstream side. DPF) is built in.

また、第２パイプ２０には、排気上流側である車幅方向他側部分に、排気浄化ケース１０の車幅方向他側の側面に設けられた尿素水添加インジェクタ４４（還元剤添加手段）のノズル先端部４４ａが位置している。当該尿素水添加インジェクタ４４は、ノズル先端部４４ａが第２パイプ２０の断面中心に位置しており、当該ノズル先端部４４ａから排気下流側へ放射状に還元剤である尿素水（ユリア水）を噴射する機能を有している。   The second pipe 20 has a urea water addition injector 44 (reducing agent addition means) provided on the other side in the vehicle width direction of the exhaust purification case 10 on the other side in the vehicle width direction on the exhaust upstream side. The nozzle tip 44a is located. In the urea water addition injector 44, the nozzle tip 44a is located at the center of the cross section of the second pipe 20, and urea water (urea water) as a reducing agent is injected radially from the nozzle tip 44a to the exhaust downstream side. It has a function to do.

さらに、第３パイプ２２には、排気上流側である車幅方向一側に還元剤の添加によって排気中のＮＯｘを選択還元するＮＯｘ触媒４６（以下ＳＣＲ触媒４６という）が、排気下流側である車幅方向他側には後段酸化触媒４８が配設されている。
以下このように構成された本発明に係る排気後処理装置の作用について説明する。
ディーゼルエンジン６から排出される排気は排気管８を介して排気浄化ケース１０内に流入する。 Further, in the third pipe 22, a NOx catalyst 46 (hereinafter referred to as SCR catalyst 46) that selectively reduces NOx in the exhaust by adding a reducing agent to one side in the vehicle width direction that is upstream of the exhaust is on the downstream side of the exhaust. A rear-stage oxidation catalyst 48 is disposed on the other side in the vehicle width direction.
The operation of the exhaust aftertreatment device according to the present invention configured as described above will be described below.
Exhaust gas discharged from the diesel engine 6 flows into the exhaust purification case 10 through the exhaust pipe 8.

図６に示すように、排気浄化ケース１０において排気管８から流入した排気は、排気流入室２６から第１パイプ１８内に流入する。
当該第１パイプ１８内を流通する排気は、前段酸化触媒４０により排気中のＨＣ及びＣＯがＣＯ２及びＨ２Ｏに変化し、ＤＰＦ４２によりＰＭが捕捉される。
そして、当該第１パイプ１８を介して車幅方向一側から他側折り返し室３２に流入した排気は、車幅一側へと折り返されて第２パイプ２０内に流入する。 As shown in FIG. 6, the exhaust gas flowing from the exhaust pipe 8 in the exhaust purification case 10 flows into the first pipe 18 from the exhaust inflow chamber 26.
In the exhaust gas flowing through the first pipe 18, HC and CO in the exhaust gas are changed to CO 2 and H 2 O by the pre-stage oxidation catalyst 40, and PM is captured by the DPF 42.
Then, the exhaust gas flowing into the other side folding chamber 32 from one side in the vehicle width direction through the first pipe 18 is folded back to the one side in the vehicle width and flows into the second pipe 20.

また、当該第２パイプ２０内では、排気上流側位置にて尿素水添加４４のノズル先端部４４ａから尿素水が噴射され、当該第２パイプ２０内を通る排気中に尿素水が添加される。なお、当該尿素水が排気中に添加されると、加水分解されアンモニア（ＮＨ３）に変化する。
当該アンモニア（ＮＨ３）を含む排気は、一側折り返し室２８に流入し、車幅方向他側へと折り返されて第３パイプ２２内に流入する。 Further, in the second pipe 20, urea water is injected from the nozzle tip 44 a of the urea water addition 44 at the exhaust upstream side position, and urea water is added into the exhaust gas passing through the second pipe 20. Incidentally, when the urea water is added to the exhaust, it changes hydrolyzed ammonia (NH 3).
The exhaust gas containing ammonia (NH 3 ) flows into the one-side folding chamber 28, is folded back to the other side in the vehicle width direction, and flows into the third pipe 22.

そして、当該アンモニア（ＮＨ３）を含む排気が第３パイプ２２内のＳＣＲ触媒４６を流通することで、当該ＳＣＲ触媒４６にアンモニア（ＮＨ３）が添加され、排気中のＮＯｘは窒素（Ｎ２）と水（Ｈ２Ｏ）に選択還元される。さらに、当該ＳＣＲ触媒４６で使用されずに変化しなかった余剰のアンモニア（ＮＨ３）は後段酸化触媒４８により浄化される。 The exhaust gas containing ammonia (NH 3 ) flows through the SCR catalyst 46 in the third pipe 22, whereby ammonia (NH 3 ) is added to the SCR catalyst 46, and NOx in the exhaust gas is nitrogen (N 2). ) And water (H 2 O). Furthermore, surplus ammonia (NH 3 ) that has not been used and has not changed in the SCR catalyst 46 is purified by the post-stage oxidation catalyst 48.

当該第３パイプ２２を流通し浄化された排気は排気流出室３４に流入し、アウトレットパイプ３６を介して大気に放出される。
このように本発明に係る排気後処理装置では、排気浄化ケース１０内部に他側折り返し部３２及び一側折り返し部２８の２つの折り返し部を形成し、ＤＰＦ４２を備える第１パイプ１８及びＳＣＲ触媒４６を備える第３パイプ２２を配設するとともに、ＳＣＲ触媒４６より排気上流側に尿素水が添加される第２のパイプ２０を配設した構成とすることで、尿素水の拡散に十分なスペースを確保し、当該尿素水の拡散を促進させている。特に当該尿素水は第２パイプ２０の排気上流側位置で、且つ当該第２パイプ２０の断面中心位置から排気下流側へ放射状に噴射されることから、ＳＣＲ触媒４６までの間隔が十分に確保されるとともに、第２パイプ２０内を通る排気中に効率よく均一に尿素水を添加させることができ、尿素水を確実に拡散させることができる。 The exhaust gas circulated and purified through the third pipe 22 flows into the exhaust outlet chamber 34 and is released to the atmosphere via the outlet pipe 36.
As described above, in the exhaust gas aftertreatment device according to the present invention, the two folded portions of the other side folded portion 32 and the one side folded portion 28 are formed inside the exhaust purification case 10, and the first pipe 18 and the SCR catalyst 46 including the DPF 42 are formed. And the second pipe 20 to which urea water is added upstream of the SCR catalyst 46 is provided, so that a sufficient space for diffusion of the urea water is provided. Ensuring and promoting the diffusion of the urea water. In particular, since the urea water is injected radially from the exhaust pipe upstream side position of the second pipe 20 and from the center position of the cross section of the second pipe 20 to the exhaust gas downstream side, a sufficient distance to the SCR catalyst 46 is ensured. In addition, the urea water can be efficiently and uniformly added to the exhaust gas passing through the second pipe 20, and the urea water can be reliably diffused.

また、排気浄化ケース１０内部の排気経路を２箇所で折り返した構成とすることで、排気入口となる排気管８が排気浄化ケース１０の一側に、排気出口となるアウトレットパイプ３６が排気浄化ケース１０の他側に配置されることから、従来のように排気入口及び排気出口を近接される必要はなく、当該排気入口及び排気出口の配置の自由度を向上させることができる。これにより、車体の構成に合わせた排気浄化ケース１０の構成とすることができ、当該排気浄化ケース１０の搭載性も向上させることができる。   Further, the exhaust path inside the exhaust purification case 10 is folded at two locations, so that the exhaust pipe 8 serving as an exhaust inlet is on one side of the exhaust purification case 10 and the outlet pipe 36 serving as an exhaust outlet is disposed on the exhaust purification case. Since it is arrange | positioned on the other side of 10, it is not necessary to make an exhaust inlet and an exhaust outlet adjoin, unlike the past, and the freedom degree of arrangement | positioning of the said exhaust inlet and exhaust outlet can be improved. Thereby, it can be set as the structure of the exhaust purification case 10 matched with the structure of the vehicle body, and the mounting property of the said exhaust purification case 10 can also be improved.

以上のことから、本発明に係る排気後処理装置は、大型化を抑制しつつ排気浄化ケース１０の構成の自由度を向上させることができるとともに、還元剤を十分に拡散させＳＣＲ触媒によるＮＯｘ浄化率を向上させることができる。
以上で本発明に係る排気後処理装置の実施形態についての説明を終えるが、実施形態は上記実施形態に限られるものではない。 From the above, the exhaust aftertreatment device according to the present invention can improve the degree of freedom of the configuration of the exhaust purification case 10 while suppressing the increase in size, and sufficiently diffuse the reducing agent to purify NOx by the SCR catalyst. The rate can be improved.
Although the description about the embodiment of the exhaust aftertreatment device according to the present invention is finished above, the embodiment is not limited to the above embodiment.

例えば、上記実施形態では、ＤＰＦ４２の排気上流側に前段酸化触媒４０が、ＳＣＲ触媒４４の排気下流側に後段酸化触媒が配設されているが、第１パイプ１８にＤＰＦ４２が、第３パイプにＳＣＲ触媒が配設されていればよく、酸化触媒を設けなかったり、ＤＰＦやＳＣＲ触媒の前後にその他の触媒や装置を設けても構わない。
また、上記実施形態では、排気浄化ケース１０の側面視上段後部位置に第１パイプ１８、中央位置に第２パイプ２０、中段前部位置に第３パイプ２２が配設されているが、各パイプの位置関係はこれに限られるものではなく、当該位置関係と異なる位置関係でも構わない。 For example, in the above-described embodiment, the upstream oxidation catalyst 40 is disposed upstream of the DPF 42 and the downstream oxidation catalyst is disposed downstream of the SCR catalyst 44. However, the DPF 42 is disposed on the first pipe 18 and the third pipe is disposed on the third pipe. As long as the SCR catalyst is disposed, the oxidation catalyst may not be provided, or another catalyst or device may be provided before or after the DPF or SCR catalyst.
Moreover, in the said embodiment, although the 1st pipe 18 is arrange | positioned by the side position upper part rear position of the exhaust gas purification case 10, the 2nd pipe 20 is arrange | positioned in the center position, and the 3rd pipe 22 is arrange | positioned in the middle stage front position, The positional relationship is not limited to this, and may be a positional relationship different from the positional relationship.

また、上記実施形態では排気管８が排気浄化ケース１０の車幅方向一側の上段前部に、アウトレットパイプ３６が排気浄化ケース１０の下段後部に接続されているが、当該排気管８及びアウトレットパイプ３６の位置関係はこれに限られるものではなく、当該位置関係と異なる位置関係でも構わない。
また、上記実施形態では、車両１のフレーム２右側であってキャブ４の後方位置に排気浄化ケース１０が搭載されているが、当該排気浄化ケースの搭載位置はこれに限られるものではなく、車体の他の位置に搭載しても構わない。 In the above embodiment, the exhaust pipe 8 is connected to the upper front part of the exhaust purification case 10 on one side in the vehicle width direction, and the outlet pipe 36 is connected to the lower rear part of the exhaust purification case 10. The positional relationship of the pipes 36 is not limited to this, and a positional relationship different from the positional relationship may be used.
Further, in the above embodiment, the exhaust purification case 10 is mounted on the right side of the frame 2 of the vehicle 1 and behind the cab 4. However, the mounting position of the exhaust purification case is not limited to this, and the vehicle body You may mount in other positions.

本発明の実施形態に係る排気後処理装置を備えた車両の上面視図である。1 is a top view of a vehicle provided with an exhaust aftertreatment device according to an embodiment of the present invention. 本発明の実施形態に係る排気後処理装置を備えた車両の側面視図である。1 is a side view of a vehicle provided with an exhaust aftertreatment device according to an embodiment of the present invention. 本発明の実施形態に係る排気後処理装置の排気浄化ケースの上面視図である。It is a top view of the exhaust gas purification case of the exhaust gas aftertreatment device according to the embodiment of the present invention. 図３のＡ−Ａ線における断面図である。It is sectional drawing in the AA of FIG. 図３のＢ−Ｂ線における断面図である。It is sectional drawing in the BB line of FIG. 図５のＣ−Ｃ線における断面図である。It is sectional drawing in the CC line of FIG.

符号の説明Explanation of symbols

１ 車両
８ 排気管（排気通路）
１０ 排気浄化ケース
１８ 第１パイプ（第１の通路）
２０ 第２パイプ（第２の通路）
２２ 第３パイプ（第３の通路）
２４ 区画壁
２６ 排気流入室（排気流入部）
２８ 一側折り返し室（第２の折り返し部）
３２ 他側折り返し室（第１の折り返し部）
３４ 排気流出室（排気流出部）
３６ アウトレットパイプ
４２ ディーゼルパティキュレートフィルタ（ＤＰＦ）
４４ 尿素水添加インジェクタ（還元剤添加手段）
４６ ＮＯｘ触媒（ＳＣＲ触媒）
４８ 後段酸化触媒 1 Vehicle 8 Exhaust pipe (exhaust passage)
10 Exhaust gas purification case 18 First pipe (first passage)
20 Second pipe (second passage)
22 3rd pipe (3rd passage)
24 partition wall 26 exhaust inflow chamber (exhaust inflow part)
28 One-side folding chamber (second folding section)
32 Other side folding chamber (first folding section)
34 Exhaust outflow chamber (exhaust outflow section)
36 Outlet pipe 42 Diesel particulate filter (DPF)
44 Urea water addition injector (reducing agent addition means)
46 NOx catalyst (SCR catalyst)
48 Second-stage oxidation catalyst

Claims (1)

内燃機関の排気通路に介装されるケース内部に、排気中のパティキュレートマターを捕捉するパティキュレートフィルタ及び還元剤添加手段より添加される還元剤によって排気中のＮＯｘを選択還元するＮＯｘ触媒を有した排気浄化装置であって、
前記ケース内部に配設され、該ケース内部一側に形成され前記内燃機関からの排気が流入する排気流入部及び該ケース内部の他側に形成された第１の折り返し部を連通し、前記パティキュレートフィルタが内装された第１の通路と、
前記ケース内部に配設され、前記第１の折り返し部及び該ケース内部の一側に形成された第２の折り返し部を連通し、内部が断面円形状の管状通路であり、当該内部に前記ケースの他側面に配設された前記還元剤添加手段から排気上流側位置で、当該内部断面中心から排気下流側へ放射状に還元剤が噴射されることで該還元剤が排気中に添加される第２の通路と、
前記ケース内部に配設され、前記第２の折り返し部及び該ケース内部の他側に形成され排気が流出する排気流出部を連通し、前記ＮＯｘ触媒が内装された第３の通路と、
を備えたことを特徴とする排気後処理装置。 Inside the case interposed in the exhaust passage of the internal combustion engine, there is a particulate filter that captures particulate matter in the exhaust and a NOx catalyst that selectively reduces NOx in the exhaust by a reducing agent added from the reducing agent adding means. An exhaust purification device,
An exhaust inflow portion which is disposed inside the case and is formed on one side of the case and into which exhaust from the internal combustion engine flows and a first folded portion formed on the other side of the case communicate with each other. A first passage with a curated filter,
A tubular passage having a circular cross-section inside, the first folded portion and a second folded portion formed on one side inside the case, which is disposed inside the case, communicates with the case. of the exhaust upstream side position from the provided by said reducing agent adding means on the other side, the said reducing agent by the reducing agent radially from the internal cross-sectional center to the exhaust downstream side is injection is added to the exhaust Two passages,
A third passage disposed in the case, communicating with the second folded portion and an exhaust outflow portion formed on the other side of the case through which exhaust flows out, and having the NOx catalyst incorporated therein;
An exhaust aftertreatment device characterized by comprising:
JP2007308655A 2007-11-29 2007-11-29 Exhaust aftertreatment device Active JP5057944B2 (en)

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JP5664259B2 (en) * 2011-01-17 2015-02-04 三菱ふそうトラック・バス株式会社 Exhaust purification device
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