JP5898868B2 - Exhaust gas purification device - Google Patents
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- JP5898868B2 JP5898868B2 JP2011149311A JP2011149311A JP5898868B2 JP 5898868 B2 JP5898868 B2 JP 5898868B2 JP 2011149311 A JP2011149311 A JP 2011149311A JP 2011149311 A JP2011149311 A JP 2011149311A JP 5898868 B2 JP5898868 B2 JP 5898868B2
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- 238000000746 purification Methods 0.000 title claims description 29
- 239000007789 gas Substances 0.000 claims description 107
- 238000011144 upstream manufacturing Methods 0.000 claims description 79
- 239000003054 catalyst Substances 0.000 claims description 61
- 230000003647 oxidation Effects 0.000 claims description 40
- 238000007254 oxidation reaction Methods 0.000 claims description 40
- 239000003638 chemical reducing agent Substances 0.000 claims description 32
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 17
- 238000013459 approach Methods 0.000 claims description 4
- 229910017464 nitrogen compound Inorganic materials 0.000 claims description 3
- 150000002830 nitrogen compounds Chemical class 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241001061137 Caulophrynidae Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
本発明は、排気ガス浄化装置に関する。 The present invention relates to an exhaust gas purification device.
排気ガスに還元剤を供給して混合し、排気ガス中の窒素酸化物を還元触媒にて還元する浄化装置が知られている。例えば、特許文献１に記載された浄化装置では、酸化触媒と還元触媒とを接続する排気管の内部に、旋回流を発生させるためのフィンを有するプレートが配置されている。この浄化装置では、フィンを通過することで排気ガスが旋回流となるので、還元剤と排気ガスとがよく混ざり、排気ガス中の窒素酸化物の還元効率を高めることができる。 2. Description of the Related Art A purification device is known in which a reducing agent is supplied to and mixed with exhaust gas, and nitrogen oxides in the exhaust gas are reduced with a reduction catalyst. For example, in the purification apparatus described in Patent Document 1, a plate having fins for generating a swirling flow is disposed inside an exhaust pipe connecting an oxidation catalyst and a reduction catalyst. In this purification apparatus, exhaust gas turns into a swirl flow by passing through the fin, so that the reducing agent and the exhaust gas are mixed well, and the reduction efficiency of nitrogen oxides in the exhaust gas can be increased.
この浄化装置に用いられるフィンは、直線状切り込みと１／４円弧状切り込みの組からなる切り込みをプレートに形成し、この切り込みを引き起こすことで設けられた扇状部分である。そして、４つの扇状フィンが円形となるように配置されている。 The fin used in this purification device is a fan-shaped portion provided by forming a cut having a set of a linear cut and a 1/4 arc cut in the plate and causing the cut. The four fan fins are arranged so as to be circular.
前述の浄化装置では、フィンによって還元剤と排気ガスとを混合できるという利点がある一方、４つの扇状フィンを作製しなければならず、構造が複雑となり、加工に手間を要してしまうという課題があった。 The above-described purification apparatus has an advantage that the reducing agent and the exhaust gas can be mixed by the fins, but the problem is that four fan-shaped fins must be manufactured, the structure is complicated, and processing is troublesome. was there.
本発明は、このような事情に鑑みてなされたものであり、その目的は、旋回流を発生させるための構成を簡素化することにある。 The present invention has been made in view of such circumstances, and an object thereof is to simplify a configuration for generating a swirling flow.
前記目的を達成するため、本発明の排気ガス浄化装置は、排気ガス中の窒素化合物を酸化する酸化触媒と、前記酸化触媒で酸化された前記排気ガス中の窒素酸化物を、還元剤の存在下で還元して浄化する還元触媒と、前記酸化触媒の排気下流側と前記還元触媒の排気上流側の間に配設され、還元剤供給口を通じて前記還元剤が供給される連通管と、前記酸化触媒が収容されるケーシングに一端部が嵌る筒状部、及び、前記筒状部の他端部を塞ぐ閉塞部を有するキャップ形状をなし、前記酸化触媒を通過した排気ガスを前記連通管へ流すための開口を側方に向けて開設したキャップ部材と、前記キャップ部材の内側空間における前記開口の手前に配設され、前記開口側の空間と反対側の空間との間に圧力差を生じさせる圧力調整プレートとを有し、前記開口は、前記酸化触媒における前記排気ガスの流れ方向に扁平な形状であり、前記圧力調整プレートは、前記開口の長手方向一端側から他端側に向かう程に、前記開口からの距離が遠くなるように配設されていることを特徴とする。 In order to achieve the above object, an exhaust gas purification apparatus of the present invention comprises an oxidation catalyst that oxidizes nitrogen compounds in exhaust gas, and nitrogen oxides in the exhaust gas oxidized by the oxidation catalyst in the presence of a reducing agent. A reduction catalyst that reduces and purifies underneath, a communication pipe that is disposed between the exhaust gas downstream side of the oxidation catalyst and the exhaust gas upstream side of the reduction catalyst, and is supplied with the reducing agent through a reducing agent supply port; A cylindrical part having one end fitted into a casing in which the oxidation catalyst is accommodated, and a cap having a closed part that closes the other end of the cylindrical part, and exhaust gas that has passed through the oxidation catalyst to the communication pipe A pressure difference is generated between the cap member opened with the opening for flowing sideways and the opening in the inner space of the cap member before the opening, and the space on the opening side and the space on the opposite side. Yes and the pressure adjusting plate to The opening has a shape that is flat in the flow direction of the exhaust gas in the oxidation catalyst, and the pressure adjustment plate has a distance from the opening toward the other end side in the longitudinal direction of the opening. It arrange | positions so that it may become distant .
本発明の排気ガス浄化装置によれば、圧力調整プレートをキャップ部材における開口の手前に配置することで、圧力調整プレートを境にして開口側と反対側とで圧力差を生じさせる。この圧力差を利用して開口付近における排気ガスに旋回流を生じさせることができる。従って、旋回流を発生させるための構成を簡素化することができる。 According to the exhaust gas purifying apparatus of the present invention, the pressure adjustment plate is disposed in front of the opening in the cap member, thereby generating a pressure difference between the opening side and the opposite side with the pressure adjustment plate as a boundary. Using this pressure difference, a swirl flow can be generated in the exhaust gas in the vicinity of the opening. Therefore, the configuration for generating the swirling flow can be simplified.
また、前記開口は、前記酸化触媒における前記排気ガスの流れ方向に扁平な形状であり、前記圧力調整プレートは、前記開口の長手方向一端側から他端側に向かう程に、前記開口からの距離が遠くなるように配設されている。また、前記開口は、長方形の短辺を外側に凸の湾曲形状に置き換えた長円形状であることが好ましい。これらの構成では、扁平形状とされた開口に向かう排気ガスの流れ方向を、圧力調整プレートによって規制することができる。これにより、旋回流を生じさせ易くすることができる。 Further, the opening has a flat shape in the exhaust gas flow direction in the oxidation catalyst, and the pressure adjusting plate is a distance from the opening toward the other end side in the longitudinal direction of the opening. that has been disposed so as to become distant. Moreover, it is preferable that the said opening is an ellipse shape which replaced the short side of the rectangle with the curved shape convex outward. In these configurations, the flow direction of the exhaust gas toward the flat opening can be regulated by the pressure adjustment plate. Thereby, it can be made easy to produce a swirling flow.
上記の排気ガス浄化装置において、前記キャップの開口と前記連通管の排気上流端とを接続し、前記連通管に近付く程に流路幅が狭められた狭窄流路を形成する接続部材を有することが好ましい。この構成では、狭窄流路を通ることによっても、旋回流を生じさせ易くすることができる。 In the exhaust gas purifying apparatus, the connecting member that connects the opening of the cap and the exhaust upstream end of the communication pipe and forms a constricted flow path with a flow path width narrowed so as to approach the communication pipe. Is preferred. In this configuration, the swirl flow can be easily generated by passing through the narrowed flow path.
上記の排気ガス浄化装置において、前記接続部材は、前記キャップ部材の開口から前記連通管の排気上流端に向かって屈曲させた屈曲部分を有し、前記還元剤供給口は、前記屈曲部分における前記連通管の排気上流端を臨む位置に設けられていることが好ましい。この構成では、旋回流となった排気ガスに対して還元剤を供給できるので、還元剤が排気ガスによく混ざり、還元効率を高めることができる。
In the above exhaust gas purifying device, the connection member has a bent portion bent from the opening of the cap member toward the exhaust upstream end of the communication pipe, and the reducing agent supply port is formed in the bent portion. It is preferable to be provided at a position facing the exhaust upstream end of the communication pipe. In this configuration, since the reducing agent can be supplied to the exhaust gas that has turned into a swirling flow, the reducing agent is well mixed with the exhaust gas, and the reduction efficiency can be increased.
本発明によれば、圧力調整プレートをキャップ部材における開口の手前に配置するという簡単な構成で、排気ガスに旋回流を生じさせることができる。 According to the present invention, it is possible to generate a swirling flow in the exhaust gas with a simple configuration in which the pressure adjusting plate is disposed in front of the opening in the cap member.
以下、本発明の実施形態を図面に基づいて説明する。まず、排気ガスの浄化装置における全体構成について説明する。図１に示すように、浄化装置１は、エンジン（図示せず）からの排気ガスを排出するための排気通路に組み込まれている。この浄化装置１は、酸化触媒２と、上流側ケーシング３と、上流側キャップ部材４と、上流側接続部材５と、連通管６と、下流側接続部材７と、下流側キャップ部材８と、還元触媒９と、下流側ケーシング１０とを有している。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the overall configuration of the exhaust gas purification device will be described. As shown in FIG. 1, the purification device 1 is incorporated in an exhaust passage for exhausting exhaust gas from an engine (not shown). The purification device 1 includes an oxidation catalyst 2, an upstream casing 3, an upstream cap member 4, an upstream connection member 5, a communication pipe 6, a downstream connection member 7, a downstream cap member 8, A reduction catalyst 9 and a downstream casing 10 are provided.
酸化触媒２は、排気ガスに含まれる窒素化合物を酸化するものであり、例えば、ガスの流れ方向に沿って無数のガス流路が形成された円柱状の担持基材と、このガス流路の表面にコーティングされたＰｔ−Ａｌ２Ｏ３系触媒層とを有している。 The oxidation catalyst 2 oxidizes a nitrogen compound contained in the exhaust gas. For example, a cylindrical support substrate having innumerable gas flow paths formed along the gas flow direction, and the gas flow paths And a Pt—Al 2 O 3 based catalyst layer coated on the surface.
上流側ケーシング３は、酸化触媒２を収容する筒状部材であり、本実施形態では排気ガスの流れ方向に並べられた２つの酸化触媒２を収容する円形のステンレス管で構成されている。上流側ケーシング３における図中下側の端部は、エンジンからの排気ガスが流入する流入部３ａ（上流側端部）である。この流入部３ａは、エンジンからの排気管１１と酸化触媒２を収容する本体部分３ｂとを接続する部分であり、酸化触媒２側に向けて次第に直径が拡大する漏斗形状に作製されている。一方、図中上側の端部は酸化触媒２を通った排気ガスが排出される排出部３ｃ（下流側端部）である。この排出部３ｃは、酸化触媒２の周囲を囲む円形状になっている。 The upstream casing 3 is a cylindrical member that accommodates the oxidation catalyst 2, and in this embodiment, is constituted by a circular stainless steel tube that accommodates two oxidation catalysts 2 arranged in the exhaust gas flow direction. The lower end of the upstream casing 3 in the figure is an inflow portion 3a (upstream end) into which exhaust gas from the engine flows. The inflow portion 3a is a portion that connects the exhaust pipe 11 from the engine and the main body portion 3b that accommodates the oxidation catalyst 2, and is formed in a funnel shape that gradually increases in diameter toward the oxidation catalyst 2 side. On the other hand, the upper end portion in the figure is a discharge portion 3c (downstream end portion) from which exhaust gas having passed through the oxidation catalyst 2 is discharged. The discharge part 3 c has a circular shape surrounding the oxidation catalyst 2.
上流側キャップ部材４及び上流側接続部材５は、酸化触媒２で処理された排気ガスを連通管６に導くための流路部材である。これらの部材４，５、及び、上流側キャップ部材４に取り付けられた圧力調整プレート１２によって、排気ガスを旋回流にして連通管６に導いている。また、上流側接続部材５には還元剤（例えば尿素水）を供給するための還元剤供給口１３が設けられている。なお、上流側キャップ部材４、上流側接続部材５、及び、圧力調整プレート１２については後で詳しく説明する。 The upstream cap member 4 and the upstream connection member 5 are flow path members for guiding the exhaust gas treated by the oxidation catalyst 2 to the communication pipe 6. By these members 4, 5 and the pressure adjustment plate 12 attached to the upstream cap member 4, the exhaust gas is swirled and guided to the communication pipe 6. Further, the upstream connection member 5 is provided with a reducing agent supply port 13 for supplying a reducing agent (for example, urea water). The upstream cap member 4, the upstream connection member 5, and the pressure adjustment plate 12 will be described in detail later.
連通管６は、酸化触媒２の排気下流側と還元触媒９の排気上流側の間に配設され、酸化触媒２で処理された排気ガスを還元剤とともに還元触媒９側へ流すための流路部材である。本実施形態における連通管６は、上流側ケーシング３や下流側ケーシング１０よりも細い直径のステンレス製円管で作製されている。この連通管６の軸線方向は、上流側ケーシング３を流れる排気ガスの流れ方向に揃えられている。すなわち、この連通管６と、上流側キャップ部材４及び上流側接続部材５とにより、酸化触媒２で処理された排気ガスは、上流側ケーシング３の流入部３ａに向けて折り返される。 The communication pipe 6 is disposed between the exhaust gas downstream side of the oxidation catalyst 2 and the exhaust gas upstream side of the reduction catalyst 9, and is a flow path for flowing the exhaust gas treated by the oxidation catalyst 2 to the reduction catalyst 9 side together with the reducing agent. It is a member. The communication pipe 6 in the present embodiment is made of a stainless steel circular pipe having a smaller diameter than the upstream casing 3 and the downstream casing 10. The axial direction of the communication pipe 6 is aligned with the flow direction of the exhaust gas flowing through the upstream casing 3. That is, the exhaust gas treated with the oxidation catalyst 2 is folded back toward the inflow portion 3 a of the upstream casing 3 by the communication pipe 6, the upstream cap member 4, and the upstream connection member 5.
下流側接続部材７及び下流側キャップ部材８は、連通管６を通過した還元剤と排気ガス（酸化触媒２で処理された排気ガス）の混合ガスを還元触媒９に導入するための部材である。 The downstream connection member 7 and the downstream cap member 8 are members for introducing the mixed gas of the reducing agent and exhaust gas (exhaust gas treated with the oxidation catalyst 2) that has passed through the communication pipe 6 into the reduction catalyst 9. .
下流側接続部材７は、還元剤供給口１３が設けられていない点で相違しているが、他の構成は上流側接続部材５と同じである。下流側キャップ部材８は、圧力調整プレート１２が設けられていない点で相違しているが、他の構成は上流側キャップ部材４と同じである。このため、上流側キャップ部材４、及び、上流側接続部材５の説明をもってこれらの部材の説明に代えることとする。 The downstream connection member 7 is different in that the reducing agent supply port 13 is not provided, but the other configuration is the same as that of the upstream connection member 5. The downstream cap member 8 is different in that the pressure adjustment plate 12 is not provided, but the other configuration is the same as that of the upstream cap member 4. For this reason, suppose that it replaces with description of these members with description of the upstream cap member 4 and the upstream connection member 5. FIG.
還元触媒９は、混合ガスに含まれる窒素酸化物を還元して浄化するものであり、例えば、ガスの流れ方向に沿って無数のガス流路が形成された円柱状の担持基材と、このガス流路の表面にコーティングされたＣｅ−Ｔｉ−ＳＯ４−Ｚｒ系触媒層とを有している。 The reduction catalyst 9 is for reducing and purifying nitrogen oxides contained in the mixed gas. For example, a columnar supporting substrate in which an infinite number of gas flow paths are formed along the gas flow direction, It has a Ce—Ti—SO 4 —Zr-based catalyst layer coated on the surface of the gas flow path.
下流側ケーシング１０は、還元触媒９を収容する筒状部材であり、本実施形態では排気ガスの流れ方向に並べられた２つの還元触媒９を収容する円形のステンレス管で構成されている。そして、下流側ケーシング１０における図中下側の端部は、混合ガスが導入される導入部１０ａ（上流側端部）であり、下流側キャップ部材８が被せられる。また、下流側ケーシング１０における図中上側の端部は、処理後の排気ガスを放出する放出部１０ｂ（下流側端部）である。この放出部１０ｂは、下流側（還元触媒９から遠い側）に向けて次第に直径が縮小する漏斗形状に作製されている。 The downstream casing 10 is a cylindrical member that accommodates the reduction catalyst 9, and in this embodiment, is constituted by a circular stainless steel tube that accommodates two reduction catalysts 9 arranged in the exhaust gas flow direction. The lower end of the downstream casing 10 in the figure is an introduction portion 10a (upstream end) into which the mixed gas is introduced, and the downstream cap member 8 is covered therewith. Further, the upper end portion of the downstream casing 10 in the figure is a discharge portion 10b (downstream end portion) that discharges the exhaust gas after processing. The discharge portion 10b is formed in a funnel shape whose diameter gradually decreases toward the downstream side (the side far from the reduction catalyst 9).
次に、上流側キャップ部材４について説明する。図２に示すように、上流側キャップ部材４は、上流側ケーシング３と上流側接続部材５との間に介在し、酸化触媒２で処理された排気ガスの流れ方向をほぼ直角に曲げて上流側接続部材５へと流す。図２〜図５に示すように、この上流側キャップ部材４は、筒状部２１と、天井部２２と、開口筒部２３とを有している。 Next, the upstream cap member 4 will be described. As shown in FIG. 2, the upstream cap member 4 is interposed between the upstream casing 3 and the upstream connecting member 5, and bends the flow direction of the exhaust gas treated by the oxidation catalyst 2 substantially at a right angle. Flow to the side connection member 5. As shown in FIGS. 2 to 5, the upstream cap member 4 includes a tubular portion 21, a ceiling portion 22, and an open tubular portion 23.
筒状部２１は、上流側ケーシング３の端部が嵌る部分であり、開放端の内径が上流側ケーシング３における排出部３ｃの外径に揃えられた短尺の円筒状部材で作製されている。天井部２２は、筒状部２１における開放端とは反対側の端部を塞ぐ円盤状部材であり、閉塞部に相当する。図４に示すように、この天井部２２は、開口筒部２３に近い側から遠くなるほど内部空間が浅くなるように斜めに取り付けられている。これにより、天井部２２の内表面はスロープ形状に形成されている。そして、筒状部２１と天井部２２とによって底の浅いキャップ形状の部材が構成される。 The cylindrical portion 21 is a portion into which the end of the upstream casing 3 is fitted, and is made of a short cylindrical member in which the inner diameter of the open end is aligned with the outer diameter of the discharge portion 3 c in the upstream casing 3. The ceiling part 22 is a disk-like member that closes the end of the cylindrical part 21 opposite to the open end, and corresponds to a closing part. As shown in FIG. 4, the ceiling portion 22 is attached obliquely so that the inner space becomes shallower as the distance from the side closer to the opening tube portion 23 increases. Thereby, the inner surface of the ceiling part 22 is formed in the slope shape. The tubular portion 21 and the ceiling portion 22 constitute a cap-shaped member having a shallow bottom.
開口筒部２３は、筒状部２１や天井部２２と一体に設けられる部分であり、上流側接続部材５と接続されて排気ガスを案内する。この開口筒部２３は、端部の開口２３ａが、上流側ケーシング３の軸線方向（酸化触媒２を流れる排気ガスの方向）と交差する側方に向くように設けられている。図３に示すように、この開口２３ａは、上流側ケーシング３の軸線方向に扁平な形状とされる。具体的には、長方形の短辺を外側に凸の半円（湾曲）形状に置き換えた長円形状とされる。 The opening cylinder part 23 is a part provided integrally with the cylindrical part 21 and the ceiling part 22, and is connected to the upstream connection member 5 to guide the exhaust gas. The opening cylinder portion 23 is provided so that the opening 23 a at the end portion faces a side intersecting the axial direction of the upstream casing 3 (the direction of the exhaust gas flowing through the oxidation catalyst 2). As shown in FIG. 3, the opening 23 a has a flat shape in the axial direction of the upstream casing 3. Specifically, an oblong shape is formed by replacing the short side of the rectangle with an outwardly convex semicircle (curved) shape.
図２〜図５に示すように、上流側キャップ部材４の内側空間には、圧力調整プレート１２が取り付けられている。この圧力調整プレート１２は、開口２３ａの手前に配設されており、内側空間に圧力差を生じさせるための板状部材である。本実施形態の圧力調整プレート１２は、ステンレス製の板材で作製されている。 As shown in FIGS. 2 to 5, a pressure adjustment plate 12 is attached to the inner space of the upstream cap member 4. The pressure adjusting plate 12 is a plate-like member that is disposed in front of the opening 23a and causes a pressure difference in the inner space. The pressure adjustment plate 12 of the present embodiment is made of a stainless steel plate material.
図６に示すように、圧力調整プレート１２は、屈曲部分１２ａと、短尺部分１２ｂと、長尺部分１２ｃとを有している。そして、図７の方向から見ると、これらの各部分が逆「へ」の字状に屈曲されている。図６に示す下縁部分１２ｅは、上流側キャップ部材４の装着状態において、酸化触媒２の端面に対向するので、直線状に形成されている。一方、上縁部分１２ｆは、図４に示すように、天井部２２や開口筒部２３の内面に当接する。これに伴い、図６に示すように、屈曲部分１２ａについては短尺部分１２ｂや長尺部分１２ｃよりも高さが高くなっている。また、短尺部分１２ｂ及び長尺部分１２ｃについては、天井部２２分のスロープ形状にあわせ、屈曲部分１２ａから離れるほどに高さが低くなっている。さらに、長尺部分１２ｃにおける上縁部分の端部には、接合用の取付片１２ｄが設けられている。 As shown in FIG. 6, the pressure adjustment plate 12 has a bent portion 12a, a short portion 12b, and a long portion 12c. When viewed from the direction of FIG. 7, each of these portions is bent in a reverse “he” shape. Since the lower edge portion 12e shown in FIG. 6 faces the end surface of the oxidation catalyst 2 in the mounted state of the upstream cap member 4, it is formed in a straight line. On the other hand, as shown in FIG. 4, the upper edge portion 12 f abuts on the inner surface of the ceiling portion 22 and the opening tube portion 23. Accordingly, as shown in FIG. 6, the bent portion 12a is higher in height than the short portion 12b and the long portion 12c. Moreover, about the short part 12b and the long part 12c, height is so low that it leaves | separates from the bending part 12a according to the slope shape for the ceiling part 22 minutes. Furthermore, the attachment piece 12d for joining is provided in the edge part of the upper edge part in the elongate part 12c.
このような形状を有する圧力調整プレート１２は、図２や図５に示すように、長円開口２３ａの長手方向一端側から他端側に向かう程に、この長円開口２３ａからの距離が遠くなるように配設されている。本実施形態では、長円開口２３ａに対して４５度±１５度の範囲の角度となるように配設されている。 As shown in FIGS. 2 and 5, the pressure adjusting plate 12 having such a shape has a farther distance from the oval opening 23 a toward the other end side in the longitudinal direction of the oval opening 23 a. It is arranged to become. In the present embodiment, it is arranged so as to have an angle in the range of 45 ° ± 15 ° with respect to the oval opening 23a.
図５に示すように、圧力調整プレート１２によって、上流側キャップ部材４の内部空間が、長円開口２３ａに近い側の第１部分４Ａと長円開口２３ａから遠い側の第２部分４Ｂとに区画されている。圧力調整プレート１２が介在することで、第１部分４Ａにおける排気ガスの圧力が、第２部分４Ｂにおける排気ガスの圧力よりも低くなるように、圧力差が付与される。また、第２部分４Ｂの排気ガスの一部について、長尺部分１２ｃの先端を通って回り込む経路で第１部分４Ａへと流入される。 As shown in FIG. 5, the pressure adjusting plate 12 allows the internal space of the upstream cap member 4 to be divided into a first portion 4A on the side close to the oval opening 23a and a second portion 4B on the side far from the oval opening 23a. It is partitioned. By interposing the pressure adjustment plate 12, a pressure difference is applied so that the pressure of the exhaust gas in the first portion 4A is lower than the pressure of the exhaust gas in the second portion 4B. Further, a part of the exhaust gas of the second portion 4B flows into the first portion 4A through a route that goes around through the tip of the long portion 12c.
このように、第１部分４Ａと第２部分４Ｂに圧力差を与えることで、上流側接続部材５に流入する排気ガスを旋回流にすることができる。また、第２部分４Ｂから第１部分４Ａへ流れる排気ガスの経路を規制することで、排気ガスを効率よく旋回流にすることができる。なお、これらの点については後述する。 Thus, by giving a pressure difference between the first portion 4A and the second portion 4B, the exhaust gas flowing into the upstream connection member 5 can be swirled. Further, by restricting the path of the exhaust gas flowing from the second portion 4B to the first portion 4A, the exhaust gas can be efficiently swirled. These points will be described later.
次に、上流側接続部材５について説明する。図２の左側半部に示すように、上流側接続部材５は、上流側キャップ部材４の長円開口２３ａと連通管６の上流側端部とを接続する部材である。このため、上流側接続部材５における上流側キャップ部材４との接続部分（キャップ接続部分３１）は、長円状の扁平流路を内部に有する長円筒状に形成されている。一方、上流側接続部材５における連通管６との接続部分（管接続部分３２）は、連通管６と同様に円筒状に形成されている。 Next, the upstream connection member 5 will be described. As shown in the left half of FIG. 2, the upstream connection member 5 is a member that connects the oval opening 23 a of the upstream cap member 4 and the upstream end of the communication pipe 6. For this reason, the connection part (cap connection part 31) with the upstream cap member 4 in the upstream connection member 5 is formed in the long cylindrical shape which has an oblong flat flow path inside. On the other hand, the connection part (pipe connection part 32) with the communication pipe 6 in the upstream connection member 5 is formed in a cylindrical shape like the communication pipe 6.
キャップ接続部分３１と管接続部分３２との間には、排気ガスの流路を連通管６の上流端に向けて曲げるための屈曲部分３３が設けられている。この屈曲部分３３の内部には、連通管６に近付く程に流路幅が狭められた狭窄流路が形成されている。この狭窄流路の断面形状は、上流側から下流側に向かうにつれて長円形状から円形状に変化する。この場合、狭窄流路の下流側端部はテーパー面になるため、狭窄流路を流れる排気ガスは、このテーパー面に沿って流れることで旋回流が生じ易くなる。 Between the cap connection part 31 and the pipe connection part 32, a bent part 33 for bending the exhaust gas flow path toward the upstream end of the communication pipe 6 is provided. Inside the bent portion 33, a narrow channel is formed in which the channel width is narrowed so as to approach the communication pipe 6. The cross-sectional shape of the constricted flow path changes from an oval shape to a circular shape as it goes from the upstream side to the downstream side. In this case, since the downstream end of the constricted flow path has a tapered surface, the exhaust gas flowing through the constricted flow path tends to generate a swirling flow by flowing along the tapered surface.
また、図２及び図４に示すように、屈曲部分３３には還元剤供給口１３が設けられている。この還元剤供給口１３は、酸化触媒２で処理された後の排気ガスへ還元剤を供給するためのものであり、連通管６の排気上流端を臨む位置に設けられている。例えば、図４に仮想線で示す供給ノズル３４を還元剤供給口１３に挿入し、上流側接続部材５を流れる排気ガスに対し、この供給ノズル３４を通じて還元剤を供給する。供給された還元剤は、排気ガスと混ざりつつ連通管６を流れる。 As shown in FIGS. 2 and 4, the bent portion 33 is provided with a reducing agent supply port 13. The reducing agent supply port 13 is for supplying the reducing agent to the exhaust gas after being treated with the oxidation catalyst 2, and is provided at a position facing the exhaust upstream end of the communication pipe 6. For example, the supply nozzle 34 indicated by a virtual line in FIG. 4 is inserted into the reducing agent supply port 13, and the reducing agent is supplied to the exhaust gas flowing through the upstream connection member 5 through the supply nozzle 34. The supplied reducing agent flows through the communication pipe 6 while being mixed with the exhaust gas.
以上の構成を有する浄化装置１では、エンジンからの排気ガスが流入部３ａから流入する。そして、排気ガスに含まれる一酸化窒素が酸化触媒２によって酸化されて二酸化窒素になる。酸化触媒２で処理された排気ガスは、上流側キャップ部材４及び上流側接続部材５を通って連通管６に導入される。その際、排気ガスは旋回流となり、上流側接続部材５の還元剤供給口１３を通じて供給された還元剤と混合される。連通管６を通過した混合ガスは、下流側接続部材７及び下流側キャップ部材８を通じて還元触媒９に導入される。還元触媒９は、混合ガスに含まれる二酸化窒素を窒素に還元する。還元触媒９で処理された混合ガスは、放出部１０ｂを通じて大気に放出される。 In the purification device 1 having the above configuration, exhaust gas from the engine flows in from the inflow portion 3a. Then, nitric oxide contained in the exhaust gas is oxidized by the oxidation catalyst 2 to become nitrogen dioxide. The exhaust gas treated by the oxidation catalyst 2 is introduced into the communication pipe 6 through the upstream cap member 4 and the upstream connection member 5. At that time, the exhaust gas becomes a swirling flow and is mixed with the reducing agent supplied through the reducing agent supply port 13 of the upstream connection member 5. The mixed gas that has passed through the communication pipe 6 is introduced into the reduction catalyst 9 through the downstream connection member 7 and the downstream cap member 8. The reduction catalyst 9 reduces nitrogen dioxide contained in the mixed gas to nitrogen. The mixed gas treated with the reduction catalyst 9 is discharged to the atmosphere through the discharge portion 10b.
そして、この浄化装置１では、上流側キャップ部材４の内部空間に圧力調整プレート１２を配設しているので、排気ガスを旋回流にして連通管６に導入させることができる。また、上流側接続部材５の内部空間を、連通管６に近付く程に流路幅を狭くするように構成しているので、この点でも排気ガスを旋回させ易くできる。以下、これらの点について説明する。 In this purification device 1, the pressure adjusting plate 12 is disposed in the internal space of the upstream cap member 4, so that the exhaust gas can be introduced into the communication pipe 6 as a swirling flow. In addition, since the internal space of the upstream connection member 5 is configured so that the flow path width becomes narrower as it approaches the communication pipe 6, the exhaust gas can be easily swirled in this respect as well. Hereinafter, these points will be described.
図８は、酸化触媒２から連通管６までの排気ガス（流体）の流れを示す解析結果である。図に描かれた複数の線は、それぞれ排気ガスが流れる経路を表している。そして、各線における色の濃さは、その経路における排気ガスの流速を示している。なお、図８の解析結果において、酸化触媒２が収容された上流側ケーシング３の直径は２３０ｍｍ、連通管６の直径は７５ｍｍである。 FIG. 8 is an analysis result showing the flow of exhaust gas (fluid) from the oxidation catalyst 2 to the communication pipe 6. A plurality of lines drawn in the figure represent paths through which exhaust gas flows. The color intensity in each line indicates the exhaust gas flow velocity in the path. In the analysis result of FIG. 8, the diameter of the upstream casing 3 in which the oxidation catalyst 2 is accommodated is 230 mm, and the diameter of the communication pipe 6 is 75 mm.
図８から、酸化触媒２を通過した排気ガスは、キャップ部材の内部空間を長円開口２３ａに向けて流れることが判る。また、排気ガスは、圧力調整プレート１２によって流れ方向を規制され、長円開口２３ａに対して斜め方向から多くの量が流入することも判る。また、酸化触媒２から長円開口２３ａまでの第１範囲Ｙ１と、上流側接続部材５に対応する第２範囲Ｙ２と、連通管６に対応する第３範囲Ｙ３に分けた場合、第１範囲Ｙ１の流速が最も遅く、第２範囲Ｙ２で加速され、第３範囲Ｙ３でさらに加速されることが確認された。これは、排気ガスが通る流路の断面積が次第に狭くなっているからと考えられる。 8 that the exhaust gas that has passed through the oxidation catalyst 2 flows through the inner space of the cap member toward the oval opening 23a. It can also be seen that the flow direction of the exhaust gas is regulated by the pressure adjusting plate 12, and that a large amount of the exhaust gas flows from the oblique direction into the oval opening 23a. Further, when the first range Y1 from the oxidation catalyst 2 to the oval opening 23a, the second range Y2 corresponding to the upstream connection member 5, and the third range Y3 corresponding to the communication pipe 6 are divided, the first range It was confirmed that the flow velocity of Y1 was the slowest, accelerated in the second range Y2, and further accelerated in the third range Y3. This is presumably because the cross-sectional area of the flow path through which the exhaust gas passes gradually becomes narrower.
図９は、上流側キャップ部材４の内部空間における、圧力調整プレート１２近傍の圧力分布を示す解析結果であり、排気ガスの大まかな圧力分布を等圧線で示している。図９より、圧力調整プレート１２を境に、長円開口側の第１部分４Ａと反対側の第２部分４Ｂとで大きな圧力差が生じていることが判る。図９における圧力調整プレート１２の右近傍の範囲Ｚ１が最も圧力が低く、この例では１１８０００Ｐａであった。これに対し、圧力調整プレート１２の左近傍の範囲Ｚ２が最も圧力が高く、この例では１２８０００Ｐａであった。 FIG. 9 is an analysis result showing the pressure distribution in the vicinity of the pressure adjustment plate 12 in the internal space of the upstream cap member 4, and the rough pressure distribution of the exhaust gas is shown by isobars. From FIG. 9, it can be seen that there is a large pressure difference between the first portion 4A on the oval opening side and the second portion 4B on the opposite side, with the pressure adjustment plate 12 as a boundary. The range Z1 in the vicinity of the right side of the pressure adjustment plate 12 in FIG. 9 has the lowest pressure, which is 118000 Pa in this example. On the other hand, the range Z2 in the vicinity of the left side of the pressure adjusting plate 12 has the highest pressure, which is 128000 Pa in this example.
このような大きな圧力差が圧力調整プレート１２の近傍範囲Ｚ１，Ｚ２で生じると、流速が高められた排気ガスが、圧力調整プレート１２に沿って回り込むように流れると解される。そして、圧力調整プレート１２における長円開口側の表面に排気ガスが流れ込んでくると、この排気ガスは、圧力調整プレート１２や開口筒部２３の内表面等に沿って多く流れる。その結果、図８に示すように、排気ガスは旋回流となって、上流側接続部材５の狭窄流路及び連通管６の内部を流れる。その際、排気ガスは、狭窄流路にてテーパー面に沿って流れるため、旋回流をさらに強めることができる。 When such a large pressure difference occurs in the vicinity range Z1 and Z2 of the pressure adjustment plate 12, it is understood that the exhaust gas whose flow velocity is increased flows so as to wrap around the pressure adjustment plate 12. When the exhaust gas flows into the surface of the pressure adjustment plate 12 on the oval opening side, a lot of this exhaust gas flows along the pressure adjustment plate 12, the inner surface of the opening cylinder portion 23, and the like. As a result, as shown in FIG. 8, the exhaust gas becomes a swirling flow and flows through the narrowed flow path of the upstream connection member 5 and the inside of the communication pipe 6. At that time, since the exhaust gas flows along the tapered surface in the constricted flow path, the swirl flow can be further strengthened.
このように、本実施形態の浄化装置１では、連通管６において排気ガスを旋回流の状態で流すことができるので、還元剤供給口１３を通じて供給された還元剤を、排気ガスに対して拡散させた状態（より均質に近い状態）で混合することができる。その結果、還元触媒９で二酸化窒素を窒素に還元する際の反応性を高めることができ、排気ガスの浄化性能を高めることができる。 As described above, in the purification device 1 of the present embodiment, the exhaust gas can flow in the swirling state in the communication pipe 6, so that the reducing agent supplied through the reducing agent supply port 13 is diffused into the exhaust gas. It is possible to mix in a mixed state (closer to homogeneity). As a result, the reactivity when reducing the nitrogen dioxide to nitrogen by the reduction catalyst 9 can be enhanced, and the exhaust gas purification performance can be enhanced.
なお、図１０は、上流側ケーシング３及び連通管６の直径が先の実施形態と異なる他の浄化装置１での解析結果である。この浄化装置１において、上流側ケーシング３の直径φ３は３００ｍｍ、連通管６の直径φ６は１００ｍｍである。図１０より、サイズの異なる他の浄化装置１であっても、排気ガスが旋回流となって連通管６を流れることが確認できた。したがって、この浄化装置１においても、先に説明した浄化装置１と同様に、排気ガスの浄化性能を高めることができる。 In addition, FIG. 10 is the analysis result in the other purification apparatus 1 from which the diameter of the upstream casing 3 and the communicating pipe 6 differs from previous embodiment. In this purification device 1, the upstream casing 3 has a diameter φ3 of 300 mm, and the communication pipe 6 has a diameter φ6 of 100 mm. From FIG. 10, it was confirmed that even in the other purification apparatuses 1 having different sizes, the exhaust gas turns into a swirling flow and flows through the communication pipe 6. Therefore, in this purification apparatus 1 as well, the purification performance of exhaust gas can be improved as in the purification apparatus 1 described above.
また、図１１は、圧力調整プレート１２を設けていない比較例の浄化装置１での解析結果であり、圧力調整プレート１２を除く各部は、先に説明した浄化装置１と同じ構成である。この図１１より、圧力調整プレート１２が設けられないと、旋回流が生じないことが判る。言い換えれば、圧力調整プレート１２によって旋回流が生じていることが判る。 Moreover, FIG. 11 is an analysis result in the purification apparatus 1 of the comparative example which does not provide the pressure adjustment plate 12, and each part except the pressure adjustment plate 12 is the same structure as the purification apparatus 1 demonstrated previously. From FIG. 11, it can be seen that if the pressure adjusting plate 12 is not provided, the swirling flow does not occur. In other words, it can be seen that a swirling flow is generated by the pressure adjusting plate 12.
以上説明したように、本実施形態の浄化装置１によれば、上流側キャップ部材４の内側空間における開口２３ａの手前に、開口側の空間と反対側の空間との間に圧力差を生じさせる圧力調整プレート１２を配設しているので、この圧力差を利用して開口付近における排気ガスに旋回流を生じさせることができる。すなわち、旋回流を発生させるための構成を簡素化することができる。 As described above, according to the purification device 1 of the present embodiment, a pressure difference is generated between the space on the opening side and the space on the opposite side in front of the opening 23 a in the inner space of the upstream cap member 4. Since the pressure adjusting plate 12 is provided, a swirl flow can be generated in the exhaust gas in the vicinity of the opening by utilizing this pressure difference. That is, the configuration for generating the swirling flow can be simplified.
また、本実施形態の浄化装置１では、扁平な長円開口２３ａの長手方向一端側から他端側へ向かう程に、長円開口２３ａからの距離が遠くなるように配設されているので、長円開口２３ａに向かう排気ガスの流れ方向を、圧力調整プレート１２によって規制することができる。その結果、旋回流を生じさせ易くすることができる。 Further, in the purification device 1 of the present embodiment, the flat ellipse opening 23a is disposed so that the distance from the ellipse opening 23a increases as it goes from one end side to the other end side in the longitudinal direction. The flow direction of the exhaust gas toward the oval opening 23 a can be regulated by the pressure adjustment plate 12. As a result, a swirl flow can be easily generated.
加えて、開口筒部２３と連通管６との間に、狭窄流路を形成する上流側接続部材５を設けているので、狭窄流路を通ることによっても旋回流を発生させ易くすることができる。 In addition, since the upstream connection member 5 that forms the constricted flow path is provided between the opening cylinder portion 23 and the communication pipe 6, it is possible to easily generate a swirling flow even through the constricted flow path. it can.
さらに、還元剤供給口１３は、連通管６の排気上流端を臨む位置に設けられているので、旋回流となった排気ガスに対して還元剤を供給することができる。 Furthermore, since the reducing agent supply port 13 is provided at a position facing the exhaust upstream end of the communication pipe 6, the reducing agent can be supplied to the exhaust gas that has turned into a swirling flow.
以上の実施形態の説明は、本発明の理解を容易にするためのものであり、本発明を限定するものではない。本発明はその趣旨を逸脱することなく、変更、改良され得ると共に本発明にはその等価物が含まれる。例えば、次のように構成してもよい。 The above description of the embodiment is for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof. For example, you may comprise as follows.
圧力調整プレート１２に関し、前述の実施形態では、屈曲部分１２ａが長円開口２３ａの近傍位置に配置されていたが、この形状に限定されるものではない。例えば、図１２に示すように、屈曲部分１２ａを前述の実施形態よりも長円開口２３ａから遠い側に配置してもよい。要するに、圧力調整プレート１２に関しては、上流側キャップ部材４の内側空間に圧力差を生じさせる板状部材であればよい。 Regarding the pressure adjustment plate 12, in the above-described embodiment, the bent portion 12a is disposed in the vicinity of the oval opening 23a. However, the shape is not limited to this. For example, as shown in FIG. 12, the bent portion 12a may be arranged on the side farther from the oval opening 23a than in the above-described embodiment. In short, the pressure adjusting plate 12 may be a plate-like member that causes a pressure difference in the inner space of the upstream cap member 4.
上流側キャップ部材４が有する開口筒部２３に関し、前述の実施形態における開口筒部２３は、扁平な長円開口２３ａを区画するのであったが、矩形開口や六角形開口としてもよい。要するに扁平な開口であればよい。 Regarding the opening cylinder portion 23 of the upstream cap member 4, the opening cylinder portion 23 in the above-described embodiment defines the flat oval opening 23 a, but may be a rectangular opening or a hexagonal opening. In short, it may be a flat opening.
還元剤に関し、前述の実施形態では、還元剤として尿素水溶液が用いられていたが、これに限定されない。例えば、アンモニア水溶液であってもよい。また、炭化水素を主成分とする軽油を用いてもよい。 Regarding the reducing agent, in the above-described embodiment, the urea aqueous solution is used as the reducing agent, but the invention is not limited to this. For example, an aqueous ammonia solution may be used. Moreover, you may use the light oil which has a hydrocarbon as a main component.
１…排気ガスの浄化装置，２…酸化触媒，３…上流側ケーシング，３ａ…流入部，３ｂ…本体部分，３ｃ…排出部，４…上流側キャップ部材，４Ａ…第１部分，４Ｂ…第２部分，５…上流側接続部材，６…連通管，７…下流側接続部材，８…下流側キャップ部材，９…還元触媒，１０…下流側ケーシング，１０ａ…導入部，１０ｂ…放出部，１１…エンジンからの排気管，１２…圧力調整プレート，１２ａ…屈曲部分，１２ｂ…短尺部分，１２ｃ…長尺部分，１２ｄ…取付片，１２ｅ…下縁部分，１２ｆ…上縁部分，１３…還元剤供給口，２１…筒状部，２２…天井部（閉塞部），２３…開口筒部，２３ａ…長円開口（端部開口），３１…上流側接続部材のキャップ接続部分，３２…上流側接続部材の管接続部分，３３…上流側接続部材の屈曲部分，３４…供給ノズル，Ｙ１…酸化触媒から長円開口までの第１範囲，Ｙ２…上流側接続部材に対応する第２範囲，Ｙ３…連通管に対応する第３範囲，Ｚ１…圧力調整プレートの近傍範囲，Ｚ２…圧力調整プレートの近傍範囲 DESCRIPTION OF SYMBOLS 1 ... Exhaust gas purification apparatus, 2 ... Oxidation catalyst, 3 ... Upstream casing, 3a ... Inflow part, 3b ... Main part, 3c ... Discharge part, 4 ... Upstream cap member, 4A ... 1st part, 4B ... 1st 2 parts, 5 ... upstream connection member, 6 ... communication pipe, 7 ... downstream connection member, 8 ... downstream cap member, 9 ... reduction catalyst, 10 ... downstream casing, 10a ... introduction part, 10b ... discharge part, DESCRIPTION OF SYMBOLS 11 ... Exhaust pipe from engine, 12 ... Pressure adjusting plate, 12a ... Bending part, 12b ... Short part, 12c ... Long part, 12d ... Mounting piece, 12e ... Lower edge part, 12f ... Upper edge part, 13 ... Reduction Agent supply port, 21 ... cylindrical part, 22 ... ceiling part (blocking part), 23 ... opening cylinder part, 23a ... oval opening (end part opening), 31 ... cap connecting part of upstream connection member, 32 ... upstream Pipe connection part of side connection member, 33 ... Bend of upstream connection member 34, supply nozzle, Y1 ... first range from the oxidation catalyst to the oval opening, Y2 ... second range corresponding to the upstream connection member, Y3 ... third range corresponding to the communication pipe, Z1 ... pressure adjusting plate Near range, Z2 ... range near pressure adjustment plate
Claims (4)
前記酸化触媒で酸化された前記排気ガス中の窒素酸化物を、還元剤の存在下で還元して浄化する還元触媒と、
前記酸化触媒の排気下流側と前記還元触媒の排気上流側の間に配設され、還元剤供給口を通じて前記還元剤が供給される連通管と、
前記酸化触媒が収容されるケーシングに一端部が嵌る筒状部、及び、前記筒状部の他端部を塞ぐ閉塞部を有するキャップ形状をなし、前記酸化触媒を通過した排気ガスを前記連通管へ流すための開口を側方に向けて開設したキャップ部材と、
前記キャップ部材の内側空間における前記開口の手前に配設され、前記開口側の空間と反対側の空間との間に圧力差を生じさせる圧力調整プレートと、
を有し、
前記開口は、前記酸化触媒における前記排気ガスの流れ方向に扁平な形状であり、
前記圧力調整プレートは、前記開口の長手方向一端側から他端側に向かう程に、前記開口からの距離が遠くなるように配設されていることを特徴とする排気ガス浄化装置。 An oxidation catalyst that oxidizes nitrogen compounds in the exhaust gas;
A reduction catalyst for reducing and purifying nitrogen oxides in the exhaust gas oxidized by the oxidation catalyst in the presence of a reducing agent;
A communication pipe disposed between the exhaust gas downstream side of the oxidation catalyst and the exhaust gas upstream side of the reduction catalyst, to which the reducing agent is supplied through a reducing agent supply port;
The exhaust pipe that has passed through the oxidation catalyst is formed in a cap shape having a cylindrical portion with one end fitted in a casing in which the oxidation catalyst is accommodated, and a closed portion that closes the other end of the cylindrical portion. A cap member opened with the opening for flowing to the side,
A pressure adjusting plate disposed in front of the opening in the inner space of the cap member and creating a pressure difference between the space on the opening side and the space on the opposite side;
I have a,
The opening has a flat shape in the flow direction of the exhaust gas in the oxidation catalyst,
The exhaust gas purifying apparatus according to claim 1, wherein the pressure adjusting plate is disposed such that a distance from the opening becomes longer from one end side in the longitudinal direction of the opening toward the other end side .
前記還元剤供給口は、前記屈曲部分における前記連通管の排気上流端を臨む位置に設けられていることを特徴とする請求項３に記載の排気ガス浄化装置。 The connection member has a bent portion bent from the opening of the cap member toward the exhaust upstream end of the communication pipe,
The exhaust gas purifying apparatus according to claim 3 , wherein the reducing agent supply port is provided at a position facing the exhaust upstream end of the communication pipe in the bent portion.
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