WO2015015619A1

WO2015015619A1 - Exhaust gas purification system

Info

Publication number: WO2015015619A1
Application number: PCT/JP2013/070893
Authority: WO
Inventors: 美智子宮下; 広司深澤
Original assignee: Miyashita Michiko; Fukazawa Hiroshi
Priority date: 2013-08-01
Filing date: 2013-08-01
Publication date: 2015-02-05
Also published as: CN104968911A

Abstract

[Solution] An exhaust gas purification system (3) for purifying exhaust gas discharged from an engine (2) into an exhaust pipe (8), wherein a catalytic device (9) has, as catalyst carriers, at least two oxidation catalyst carriers (40-1/40-2) and/or selective catalytic reduction carriers (62-1/62-2) arranged in parallel or in series within a casing (11), with the casing (11) provided in detachable manner on the exhaust pipe (8). Thus, the exhaust gas from the engine (2) is purified efficiently even when the type of engine or the engine displacement differs, and the entire catalytic device (9) or the catalyst carriers (40-1/40-2, 62-1/62-2) inside the casing (11) can easily be replaced.

Description

Exhaust gas purification system

The present invention relates to an exhaust gas purification system, and more particularly to an exhaust gas purification system that purifies exhaust gas from an engine.

Engines such as automobiles are provided with an exhaust gas purification system to purify exhaust gas as a countermeasure against exhaust gas. Some exhaust gas purification systems include an oxidation catalyst, a reduction catalyst, a three-way catalyst, and the like.
As such an exhaust gas purification system, there are the following prior art documents.

Japanese Patent Laid-Open No. 8-193513 discloses an electric heating catalytic converter and a control method therefor, in which a notch is formed in the radial direction of the catalyst carrier, and a plurality of divided parts are opposite to the notch. In this structure, a continuous portion is formed on the side and electrodes are connected to the divided portions.

However, conventionally, in an exhaust gas purification system, since a catalyst device in which one catalyst carrier is fixed in a casing is used, it is difficult to take measures against exhaust gas when the type of engine and the amount of exhaust are different. When the catalyst carrier fixed in the casing deteriorates, it is difficult to replace only the catalyst carrier, and improvement has been desired.

Therefore, the present invention efficiently purifies exhaust gas from the engine even if the type and displacement of the engine are different, and makes it possible to easily replace the entire catalyst device or the catalyst carrier in the casing. An object is to provide a gas purification system.

The present invention provides an exhaust gas purification system for purifying exhaust gas discharged from an engine into an exhaust pipe, wherein at least two or more catalyst carriers are arranged in parallel and / or in series in the casing, and the casing is disposed in the exhaust pipe. It is characterized in that it is detachably provided.

The present invention can efficiently purify the exhaust gas from the engine even if the type of engine and the displacement are different, and can easily replace the entire catalyst device or the catalyst carrier in the casing.

FIG. 1 is a schematic configuration diagram of a catalyst device. (Example 1) FIG. 2 is a sectional view of the catalyst device. (Example 1) FIG. 3 is a partially enlarged front view of the catalyst carrier. (Example 1) FIG. 4 is a sectional view of the casing in an opened state. (Example 1) FIG. 5 is a cross-sectional view of the carrier holding member. (Example 1) FIG. 6 is a perspective view of the carrier holding member. (Example 1) FIG. 7 is a cross-sectional view of the first attaching means of the carrier holding member. (Example 1) FIG. 8 is a sectional view of the second attaching means of the carrier holding member. (Example 1) FIG. 9 is a cross-sectional view of the exhaust gas guide member of the catalyst device. (Example 1) FIG. 10 is a cross-sectional view of the first connection mechanism of the catalyst device. (Example 1) FIG. 11 is a cross-sectional view of the second connection mechanism of the catalyst device. (Example 1) FIG. 12 is a schematic configuration diagram of the vehicle. (Example 1) FIG. 13 is a schematic configuration diagram of the catalyst device. (Example 2) FIG. 14 is a cross-sectional view of the carrier holding member. (Example 2) FIG. 15 is a schematic configuration diagram of the catalyst device. (Example 3) FIG. 16 is a cross-sectional view of the carrier holding member. (Example 3) FIG. 17 is a schematic configuration diagram of the catalyst device. Example 4 FIG. 18 is a schematic configuration diagram of the catalyst device. (Example 5) FIG. 19 is a schematic configuration diagram of the catalyst device. (Example 6) FIG. 20 is a schematic configuration diagram of the catalyst device. (Example 7) FIG. 21 is a schematic configuration diagram of the catalyst device. (Example 8) FIG. 22 is a front view of the catalyst device. Example 9 FIG. 23 is a side view of the catalyst device. Example 9 FIG. 24 is a side view in which a plurality of catalyst carriers whose catalyst component loading density gradually increases are arranged in series. (Example 10) FIG. 25 is a side view of one catalyst carrier configured so that the catalyst component loading density increases stepwise. (Example 11)

The present invention aims to efficiently purify exhaust gas from the engine even if the type and displacement of the engine are different, and to easily replace the entire catalyst device or the catalyst carrier in the casing. The above catalyst carriers are arranged in parallel and / or in series in the casing, and the casing is detachably provided on the exhaust pipe.

1 to 12 show Embodiment 1 of the present invention.
As shown in FIG. 12, the vehicle 1 is equipped with an engine 2 and an exhaust gas purification system 3 of the engine 2.
The exhaust gas purification system 3 includes an exhaust manifold 5 attached to the engine 2 via a manifold attachment flange 4, and an exhaust pipe 8 connected to a manifold side connection flange 6 of the exhaust manifold 5 via an exhaust pipe side flange 7. And a catalyst device (catalytic converter) 9 attached in the middle of the exhaust pipe 8 and a muffler 10 attached to the exhaust pipe 8 on the downstream side of the catalyst device 9.

As shown in FIGS. 1 and 2, the catalyst device 9 includes a casing 11.
The casing 11 includes, for example, a one-side case portion 12 having a semicircular cross section on the upper side and an other case portion 13 having a semicircular cross section on the lower side so as to face the one side case portion 12. The joining surface of the one side case part 12 and the joining surface of the other side case part 13 are joined via a sealing material.
In the casing 11, the joined one-side case portion 12 and the other-side case portion 13 are connected by the one-side joined portion 14 with the hinge 15 and the other-side joined portion 16 by the coupling means 17.
For example, as shown in FIG. 2, the coupling means 17 includes a hook 19 that is rotatably supported by the one side case portion 12 by a support shaft 18, and the other case portion 13 that is engaged with the hook 19. And a hook stopper 20 fixed to the head.
Therefore, as shown in FIG. 4, the casing 11 is opened by removing the hook 19 from the hook stopper 20, thereby facilitating attachment / detachment of a catalyst carrier described later.

Further, as shown in FIG. 1, the casing 11 includes a case cylindrical portion 21 having a diameter larger than that of the exhaust pipe 8 and the case cylindrical shape by connecting the one side case portion 12 and the other side case portion 13. A case upstream end portion 22 at the upstream end of the portion 21 and a case downstream end portion 23 at the downstream end of the case cylindrical portion 21 are formed. Note that the case upstream end 22 can be formed in a divergent shape that extends from the upstream side to the downstream side of the exhaust gas flow. The case downstream end portion 23 can be formed in a constricted shape so as to become narrower from the upstream side to the downstream side of the exhaust gas flow.
An upstream connection pipe 24 is connected to the case upstream end 22. A downstream connection pipe 25 is connected to the case downstream end 23.

As shown in FIG. 12, the casing 11 is detachably attached to the exhaust pipe 8 by an upstream first connection mechanism 26 and a downstream second connection mechanism 27.

For example, as shown in FIG. 10, the first connection mechanism 26 includes a first exhaust pipe side connection flange 28 of the exhaust pipe 8 and a first connection pipe 24 attached to the first exhaust pipe side connection flange 28. A first attachment bolt 32 inserted through the case side connection flange 29, the first exhaust pipe side attachment hole 30 of the first exhaust pipe side connection flange 28, and the first case side attachment hole 31 of the first case side connection flange 29. And a first mounting nut 33 that is screwed onto the first mounting bolt 32.
In addition, the first exhaust pipe side mounting hole 30 and the first case side mounting hole 31 are formed not only in a circular shape but also in a long hole or a slanted hole, so that a dimensional error is absorbed at the time of mounting and the mounting work is improved. Can be made.

For example, as shown in FIG. 11, the second connection mechanism 27 includes a second exhaust pipe side connection flange 34 of the exhaust pipe 8 and a second side of the downstream side connection pipe 25 attached to the second exhaust pipe side connection flange 34. Second mounting bolts 38 inserted through the case side connection flange 35, the second exhaust pipe side mounting hole 36 of the second exhaust pipe side connection flange 34, and the second case side mounting hole 37 of the second case side connection flange 35. And a second mounting nut 39 that is screwed onto the second mounting bolt 38.
The second exhaust pipe side mounting hole 36 and the second case side mounting hole 37 are formed not only in a circular shape but also in a long hole or a slanted hole, thereby absorbing a dimensional error during mounting and improving the mounting work. Can be made.

The first connection mechanism 26 and the second connection mechanism 27 can easily attach / remove the casing 11 of the catalyst device 9 to / from the exhaust pipe 8, and can easily replace the catalyst device 9 as a whole.

In the casing 11, as shown in FIG. 1, two honeycomb-shaped oxidation catalyst carriers (honeycomb oxidation catalyst carriers) 40-1 and 40-2 are used as at least two catalyst carriers in the casing 11. Are arranged in parallel in the vertical direction.
The oxidation catalyst carriers 40-1 and 40-2 have the same size (the same diameter and the same length), and, as shown in FIG. 3, for example, a plurality of carriers 40A having a circular cross section such as cordierite or ceramics. An exhaust gas passage hole 40B is formed, and a catalyst component (catalyst metal) 40C is supported on the inner peripheral surface of each exhaust gas passage hole 40B at a predetermined density by a predetermined adhesion amount or a predetermined supporting method. Therefore, it is used for purifying the exhaust gas of a gasoline engine.
The oxidation catalyst carriers 40-1 and 40-2 are held in the casing 11 by the carrier holding member 41.
The oxidation catalyst carriers 40-1 and 40-2 are not limited to a circular cross section, and may be formed in other shapes. Further, the exhaust gas passage hole 40B can have various cross sections.

As shown in FIGS. 5 and 6, the carrier holding member 41 includes, for example, the oxidation catalyst carriers 40-1 and 40-2 so as to hold the oxidation catalyst carriers 40-1 and 40-2 in parallel in the vertical direction. Holding curved portions 42-1 and 42-2 that hold more than half of the circular shape on one side, a connecting portion 43 between the oxidation catalyst carrier 40-1 and the oxidation catalyst carrier 40-2, and both ends in the longitudinal direction. The mounting end portions 44-1 and 44-2 are formed.
More specifically, the carrier holding member 41 is formed by bending a single plate material (for example, made of stainless steel). As shown in FIG. 5, the carrier holding member 41 has an end surface portion of the holding curved portion 42-1 so that the oxidation catalyst carriers 40-1 and 40-2 are not held and removed. 45-1 and 45-1 and end face portions 45-2 and 45-2 of the holding curved portion 42-2 are more predetermined than a center line M passing through the centers C and C of the holding curved portions 42-1 and 42-2. It protrudes to the open side with a length H. The length H can be arbitrarily set.

In the carrier holding member 41, as shown in FIG. 5, when the oxidation catalyst carriers 40-1 and 40-2 are fitted into the holding curved portions 42-1 and 42-2, the oxidation catalyst carriers 40-1 and 40-2 are fitted. -2 is pushed from the opening side of the holding curved portions 42-1 and 42-2 (indicated by the solid arrow P), the end surface portions of the holding curved portions 42-1 and 42-2 are directed in the direction of the center line M. It is possible to insert the oxidation catalyst carriers 40-1 and 40-2 into the holding curved portions 33-1 and 33-2 by elastic deformation so as to spread. Thereafter, when the oxidation catalyst carriers 40-1 and 40-2 are completely accommodated in the holding curved portions 42-1 and 42-2, the oxidation catalyst carriers 40-1 and 40-2 are held by the holding curved portions 42-. It is firmly held by the urging force in the contraction direction of 1.42-2.
On the other hand, when removing the oxidation catalyst carriers 40-1 and 40-2 from the holding curved portions 42-1 and 42-2, the oxidation catalyst carriers 40-1 and 40-2 are held by the holding curved portions 42-1 and 42-2. When pulled out, the end surface portions of the holding curved portions 42-1 and 42-2 are elastically deformed so as to expand in the direction of the center line M, and the oxidation catalyst carriers 40-1 and 40-2 are held by the holding curved portions 42-1 and 42-1. It can be removed from within 42-2.
Such a structure of the carrier holding member 41 facilitates the assembly and removal of the oxidation catalyst carriers 40-1 and 40-2, facilitates the replacement of the oxidation catalyst carriers 40-1 and 40-2, and has a structure that is It can be simple and inexpensive.

As shown in FIG. 2, the carrier holding member 41 incorporating the oxidation catalyst carriers 40-1 and 40-2 has the mounting end portions 44-1 and 44-2 as one side mounting means 46-1 and the other side mounting means. By being detachably attached to the inner peripheral surface of the casing 11 by 46-2, it is fixedly arranged in the casing 11.
For example, as shown in FIG. 7, the one-side mounting means 46-1 includes a fitting protrusion 46B that protrudes from the inner peripheral surface of the one-side case 12 of the casing 11 and includes an end fitting groove 46A. The end fitting groove 46A fits and firmly holds the mounting end 44-1 of the carrier holding member 41.
For example, as shown in FIG. 8, the other-side mounting means 46-2 includes a fitting protrusion 46D that protrudes from the inner peripheral surface of the other case portion 13 of the casing 11 and includes an end fitting groove 46C. The end fitting groove 46C fits and firmly holds the mounting end 44-2 of the carrier holding member 41.

Further, as shown in FIG. 1, an exhaust gas guide member 47 that leads the exhaust gas to the upper and lower oxidation catalyst carriers 40-1 and 40-2 is disposed in the casing 11 so as to be connected to the upstream connecting pipe 24. Is done.
As shown in FIG. 8, the exhaust gas guide member 47 includes a curved surface portion 48 that is connected to the upstream connecting pipe 24 and contacts the outer peripheral surfaces of the upstream ends of the upper and lower oxidation catalyst carriers 40-1 and 40-2. And an end member 50 in the vertical direction provided with openings 49-1 and 49-2 facing the end surfaces of the upper and lower oxidation catalyst carriers 40-1 and 40-2.
The downstream ends of the oxidation catalyst carriers 40-1 and 40-2 are opened to a collecting space 51 having a large capacity at the rear portion in the casing 11.
In the casing 11, the

internal spaces

52 and 52 around the oxidation catalyst carriers 40-1 and 40-2 and the exhaust gas guide member 47 are formed so as to communicate with the collective space 51.

In the structure of the casing 11 as shown in FIG. 1, the parallel oxidation catalyst carriers 40-1 and 40-2 are arranged at the central portion, and upstream of the oxidation catalyst carriers 40-1 and 40-2. The exhaust gas from the engine 2 side is formed by arranging the side connecting pipe 24 and the curved surface portion 48 of the exhaust gas guide member 47 and forming a collective space 51 on the downstream side of the oxidation catalyst carriers 40-1 and 40-2. The resistance to the gas flow is reduced, the exhaust gas can be prevented from flowing backward in the upstream portion of the catalyst device 9, and the exhaust gas flow can be made favorable.

Next, the operation of the first embodiment will be described.
The exhaust gas from the engine 2 flows from the exhaust manifold 5 to the catalyst device 9 in the exhaust pipe 8 as shown in FIG.
In this catalyst device 9, when the exhaust gas smoothly flows from the exhaust gas guide member 47 into the oxidation catalyst carriers 40-1 and 40-2 without flowing back, harmful components in the exhaust gas are parallel to the oxidation catalyst carrier 40. -1 and 40-2, and the exhaust gas is purified.
Thereafter, the purified exhaust gas flows out into the collecting space 51 having a large capacity and also flows into the

internal spaces

52 and 52. Therefore, the catalyst device 9 can perform a muffler function to mute the exhaust gas.
Then, when it is desired to replace the entire catalyst device 9 due to deterioration of the catalyst device 9 or a difference in engine type or displacement, as shown in FIG. 12, the first connection mechanism 26 and the second connection mechanism 27 Is removed from the exhaust pipe 8, and then a new catalyst device 9 is attached to the exhaust pipe 8 by the first connection mechanism 26 and the second connection mechanism 27. Exchange can be easily performed.
Further, when the oxidation catalyst carriers 40-1 and 40-2 are to be exchanged due to deterioration of the oxidation catalyst carriers 40-1 and 40-2 in the casing 11 of the catalyst device 9 or different engine types and displacements. First, the catalyst device 9 is removed from the exhaust pipe 8, and, as shown in FIG. 4, the one side case portion 12 and the other side case portion 13 of the casing 11 are opened, and the one side attachment from the casing 11 is performed. The means 46-1 and the other side attaching means 46-2 are released, and the current oxidation catalyst carrier is removed from the carrier holding member 41. Thereafter, as shown in FIG. 5, a new oxidation catalyst carrier is attached to the carrier holding member 41, and the carrier holding member 41 is firmly fixed in the casing 11 by the one side attachment means 46-1 and the other side attachment means 46-2. Further, the casing 11 is attached to the exhaust pipe 8 by the first connection mechanism 26 and the second connection mechanism 27.
As a result, when it is desired to replace the deteriorated oxidation catalyst carrier in the casing 11 or to exchange the oxidation catalyst carrier due to a difference in engine type or displacement, the replacement operation can be performed easily.
Furthermore, by making the two oxidation catalyst carriers 40-1 and 40-2 the same size (the same diameter and the same length), the casing 11 and the carrier holding member 41 can be made versatile and the number of parts can be reduced. The structure can be made simple and inexpensive.

13 and 14 show a second embodiment of the present invention.
In the following embodiments, portions that perform the same functions as those of the first embodiment will be described with the same reference numerals.
The features of the second embodiment are as follows. That is, in the catalyst device 9 having the same structure as that of the first embodiment, as shown in FIG. 13, three honeycomb-shaped oxidation catalyst carriers 40-1 are used as at least two catalyst carriers in the casing 11. 40-2 and 40-3 are arranged in parallel in the vertical direction, and the casing 11 is detachably provided on the exhaust pipe 8 by a first connection mechanism 26 and a second connection mechanism 27.
In this case, as shown in FIG. 14, the carrier holding member 53 holds the oxidation catalyst carriers 40-1, 40-2, 40-3 in parallel in the vertical direction. Between the holding curved portions 54-1, 54-2, 54-3 that hold more than half of the circular shape on one side of 2.40-3, and between the oxidation catalyst carrier 40-1 and the oxidation catalyst carrier 40-2. A first connecting portion 55-1, a second connecting portion 55-2 between the oxidation catalyst carrier 40-2 and the oxidation catalyst carrier 40-3, and attachment end portions 56-1,. 56-2.
With such a structure, the parallel oxidation catalyst carriers 40-1, 40-2, and 40-3 effectively purify the exhaust gas even for a gasoline engine having a large displacement, and The exchange or the exchange of the oxidation catalyst carrier 40-1, 40-2, 40-3 can be easily performed.

15 and 16 show a third embodiment of the present invention.
The features of the third embodiment are as follows. That is, in the catalyst device 9, two oxidation catalyst carriers 40-1 and 40-2 are arranged in series in the casing 11 as at least two or more catalyst carriers, and the casing 11 is connected to the exhaust pipe 8. The first connection mechanism 26 and the second connection mechanism 27 are detachably provided. In this case, as shown in FIG. 15, an exhaust gas guide cylinder 57 is disposed between the upstream communication pipe 24 and the upstream oxidation catalyst carrier 40-1, and the upstream oxidation catalyst carrier 40-1 A connecting cylinder part 58-1 is arranged between the downstream side oxidation catalyst carrier 40-2.
As shown in FIG. 16, the carrier holding member 59 has a holding curved portion 60 that holds more than half of the circular shape on one side of the oxidation catalyst carrier 40-1, and a longitudinal direction so as to hold the oxidation catalyst carrier 40-1. It is provided with mounting end portions 61-1 and 61-2 at both ends in the direction.
Note that the carrier holding member that holds the oxidation catalyst carrier 40-2 has the same structure as the carrier holding member 59 described above, and a detailed description thereof will be omitted here.
With such a structure, the exhaust gas is effectively purified in two stages by the series oxidation catalyst carriers 40-1 and 40-2, and the entire catalyst device 9 is replaced or the oxidation catalyst carriers 40-1 and 40-2 are replaced. Exchange can be easily performed.

FIG. 17 shows Embodiment 4 of the present invention.
The features of the fourth embodiment are as follows. That is, in the catalyst device 9, two oxidation catalyst carriers 40-1 and 40-2 are arranged in parallel in the vertical direction as at least two catalyst carriers in the casing 11, and the oxidation catalyst carrier 40- Two oxidation catalyst carriers 40-3 and 40-4 are arranged in parallel in the vertical direction on the downstream side of 1 and 40-2, and the casing 11 is connected to the exhaust pipe 8 with the first connection mechanism 26 and the second connection mechanism 27. It was detachably provided.
In this case, the first connecting cylinder part 58-1 is disposed between the oxidation catalyst carrier 40-1 and the oxidation catalyst carrier 40-3 in series, and the oxidation catalyst carrier 40-2 and the oxidation catalyst carrier 40- in series. The second connecting cylinder part 58-2 is arranged between
In Example 4, the carrier holding members 41 shown in FIGS. 5 and 6 are used as the carrier holding members of the oxidation catalyst carriers 40-1 and 40-2 and the oxidation catalyst carriers 40-3 and 40-4. Detailed description thereof will be omitted.
According to such a structure, the oxidation catalyst carriers 40-1 and 40-2 arranged in parallel in the vertical direction, and the oxidation catalyst carriers 40-3 and 40 downstream of the oxidation catalyst carriers 40-1 and 40-2. -4, the exhaust gas is effectively purified by a two-stage structure in parallel and in series, and the entire catalyst device 9 is replaced or the oxidation catalyst carriers 40-1 and 40-2 and the oxidation catalyst carriers 40-3 and 40 -4 can be exchanged easily.

FIG. 18 shows Embodiment 5 of the present invention.
The features of the fifth embodiment are as follows. That is, in the catalyst device 9, two oxidation catalyst carriers 40-1 and 40-2 are arranged in parallel in the vertical direction as at least two catalyst carriers in the casing 11, and the oxidation catalyst carrier 40- Two selective catalytic reduction carriers (SCR catalyst carriers) 62-1 and 62-2 are arranged in parallel in the vertical direction on the downstream side of 1.40-2, and the casing 11 is connected to the exhaust pipe 8 with the first connection mechanism 26. The second connection mechanism 27 is detachably provided.
Selective catalytic reduction carrier 62-1, 62-2, a catalyst carrier of the NO _X measures to selective reduction of NO _X with NH _3, and used for purifying exhaust gas of diesel engines.
In this case, the first connecting cylinder portion 58-1 is disposed between the series oxidation catalyst carrier 40-1 and the selective catalyst reduction carrier 62-1, and the series oxidation catalyst carrier 40-2 and the selective catalyst reduction carrier 62-1. The second connecting cylinder part 58-2 is arranged between the terminal 62-1.
In Example 5, the carrier holding members 41 shown in FIGS. 5 and 6 are used as the carrier holding members of the oxidation catalyst carriers 40-1 and 40-2 and the selective catalyst reduction carriers 62-1 and 62-2. Therefore, the detailed description is abbreviate | omitted.
According to such a structure, the oxidation catalyst carriers 40-1 and 40-2 arranged in parallel in the vertical direction and the selection arranged in parallel in the vertical direction on the downstream side of the oxidation catalyst carriers 40-1 and 40-2. The catalyst reduction carriers 62-1 and 62-2 effectively purify the exhaust gas of the gasoline engine and the diesel engine and replace the entire catalyst device 9 or the oxidation catalyst carriers 40-1 and 40-2 and the selective catalyst reduction. The exchange of the carriers 62-1 and 62-2 can be easily performed.
If the exhaust gas of the diesel engine is mainly to be purified, the selective catalyst reduction carriers 62-1 and 62-2 are disposed in the casing 11 upstream of the oxidation catalyst carriers 40-1 and 40-2. Is also possible.

FIG. 19 shows Embodiment 6 of the present invention.
The features of the sixth embodiment are as follows. That is, in the catalyst device 9, two oxidation catalyst carriers 40-1 and 40-2 are arranged in parallel in the vertical direction as at least two catalyst carriers in the casing 11, and the oxidation catalyst carrier 40- Two selective catalytic reduction carriers 62-1 and 62-2 are arranged in parallel in the vertical direction on the downstream side of 1 and 40-2, and further on the downstream side of the selective catalytic reduction carriers 62-1 and 62-2. Two oxidation catalyst carriers 40-3 and 40-4 are arranged in parallel in the vertical direction, and the casing 11 is detachably provided on the exhaust pipe 8 by a first connection mechanism 26 and a second connection mechanism 27.
In this case, the first connecting cylinder part 58-1 is disposed between the oxidation catalyst carrier 40-1 and the selective catalyst reduction carrier 62-1, and the oxidation catalyst carrier 40-2 and the selective catalyst reduction carrier 62-2 are arranged. The second connecting cylinder part 58-2 is arranged between them, and the third connecting cylinder part 58-3 is arranged between the selective catalyst reduction support 62-1 and the oxidation catalyst support 40-3, and the selective catalyst reduction is performed. A fourth connecting cylinder portion 58-4 is disposed between the carrier 62-2 and the oxidation catalyst carrier 40-4.
In Example 6, the carrier holding members of the oxidation catalyst carriers 40-1 and 40-2, the selective catalyst reduction carriers 62-1 and 62-2, and the oxidation catalyst carriers 40-3 and 40-4 are: Since the carrier holding member 41 shown in FIGS. 5 and 6 is used, detailed description thereof is omitted.
According to such a structure, the exhaust gas from the engine 2 is first purified by the upstream oxidation catalyst carriers 40-1 and 40-2, and then purified by the selective catalyst reduction carriers 62-1 and 62-2. In addition, since it is purified by the oxidation catalyst carrier 40-3 and 40-4 on the downstream side, large gasoline engines and diesel engines can be dealt with, and exhaust gases from large gasoline engines and diesel engines can be used. While purifying effectively, the entire catalyst device 9 is replaced, or the oxidation catalyst carriers 40-1 and 40-2, the selective catalyst reduction carriers 62-1 and 62-2, or the oxidation catalyst carriers 40-3 and 40-4 are replaced. Exchange can be easily performed.
In this case, when it is mainly desired to purify the exhaust gas of the diesel engine, the selective catalyst reduction carriers 62-1 and 62-2 can be arranged on the most upstream side in the casing 11.

FIG. 20 shows Embodiment 7 of the present invention.
The features of the seventh embodiment are as follows. That is, in the catalyst device 9, two oxidation catalyst carriers 40-1 and 40-2 are arranged in parallel in the vertical direction as at least two catalyst carriers in the casing 11, and the oxidation catalyst carrier 40- One selective catalytic reduction carrier 62-1 is arranged at an intermediate position at a predetermined interval L on the downstream side of 1.40-2, and further, a predetermined interval is provided on the downstream side of the selective catalytic reduction carrier 62-1. L is opened and the two oxidation catalyst carriers 40-3 and 40-4 are arranged in parallel in the vertical direction, and the casing 11 is detachably provided on the exhaust pipe 8 by the first connection mechanism 26 and the second connection mechanism 27. It was.
In Example 7, the carrier holding members 41 shown in FIGS. 5 and 6 are used as the carrier holding members of the oxidation catalyst carriers 40-1 and 40-2 and the oxidation catalyst carriers 40-3 and 40-4. On the other hand, since the carrier holding member 59 shown in FIG. 16 can be used as the carrier holding member of the selective catalyst reduction carrier 62-1, the description thereof is omitted here.
According to such a structure, the upstream side oxidation catalyst carriers 40-1 and 40-2, the intermediate selective catalyst reduction carrier 62-1 and the downstream side oxidation catalyst carriers 40-3 and 40-4 each have predetermined Since they are separated by an interval L, the exhaust gas from the upstream oxidation catalyst carriers 40-1 and 40-2 flows into the selective catalyst reduction carrier 62-1, or outside the selective catalyst reduction carrier 62-1. The flow further changes direction to the outside of the oxidation catalyst carriers 40-3 and 40-4 and the oxidation catalyst carriers 40-3 and 40-4. As described above, by changing the flow of the exhaust gas, the exhaust gas of the gasoline engine or the diesel engine can be further effectively purified, and the exhaust noise can be effectively suppressed.
Further, the entire catalyst device 9 can be replaced, or the oxidation catalyst carriers 40-1 and 40-2, the selective catalyst reduction carrier 62-1 or the oxidation catalyst carriers 40-3 and 40-4 can be easily replaced. .

FIG. 21 shows Embodiment 8 of the present invention.
The features of the eighth embodiment are as follows. That is, in the catalyst device 9, three oxidation catalyst carriers 40-1, 40-2, and 40-3 are arranged in parallel in the vertical direction in the casing 11 as at least two or more catalyst carriers, and The selective catalytic reduction carriers 62-1 62-2, and 62-3 are arranged in parallel in the vertical direction on the downstream side of the catalyst carriers 40-1, 40-2, and 40-3, and the casing 11 is first connected to the exhaust pipe 8. The connection mechanism 26 and the second connection mechanism 27 are detachably provided.
Further, in this case, the first connecting cylinder portion 58-1 is disposed between the oxidation catalyst carrier 40-1 and the selective catalyst reduction carrier 62-1, and the oxidation catalyst carrier 40-2 and the selective catalyst reduction carrier 62-. 2 is connected to the second connecting cylinder part 58-2, and the third connecting cylinder part 58-3 is arranged between the oxidation catalyst carrier 40-3 and the selective catalyst reduction carrier 62-3. .
In Example 7, the carrier holding members of the oxidation catalyst carriers 40-1, 40-2, and 40-3 and the selective catalyst reduction carriers 62-1 62-2, and 62-3 are the carriers shown in FIG. Since the holding member 53 can be used, the description thereof is omitted here.
According to such a structure, a large gasoline engine is composed of the upstream oxidation catalyst carrier 40-1, 40-2, 40-3 and the downstream selective catalyst reduction carrier 62-1, 62-2, 62-3. And exhaust gas from diesel engines can be effectively purified.
In addition, the entire catalyst device 9 can be easily replaced, or the oxidation catalyst carrier 40-1, 40-2, the selective catalyst reduction carrier 62-1, or the selective catalyst reduction carrier 62-1, 62-2, 62-3 can be easily exchanged. Can be done.
In Example 8, the selective catalytic reduction carriers 62-1 62-2 and 62-3 are arranged on the upstream side, while the oxidation catalyst carriers 40-1, 40-2 and 40-3 are arranged on the downstream side. It is also possible to arrange.

22 and 23 show Embodiment 9 of the present invention.
The features of the ninth embodiment are as follows. That is, in the catalyst device 9, in the casing 11, at least two or more catalyst carriers are arranged in parallel with the oxidation catalyst carrier 40-1 at the central portion and around the oxidation catalyst carrier 40-1 in front view. Four oxidation catalyst carriers 40-2, 40-3, 40-4, and 40-5 are arranged at equal intervals in the circumferential direction, and these oxidation catalyst carriers 40-1 to 40-4 and 40-5 are arranged as carrier holding members. Hold at 63. The oxidation catalyst carriers 40-1 to 40-5 have the same diameter.
The carrier holding member 63 is composed of, for example, a pair of holding disks 64-1 and 64-2 separated by a certain distance. As shown in FIG. 22, the holding disks 64-1 and 64-2 are formed with five mounting holes 65-1 to 65-5 into which the oxidation catalyst carriers 40-1 to 40-5 are inserted. Yes.
According to such a structure, the exhaust gas from the engine 2 is effectively purified by the five oxidation catalyst carriers 40-1 to 40-5, the casing 11 is made compact, and the exhaust device 9 is downsized. Can do.
In addition, by making the five oxidation catalyst carriers 40-1 to 40-5 the same size (same diameter and length), the casing 11 and the carrier holding member 63 can be made versatile and the number of parts can be reduced. The structure can be made simple and inexpensive.
In Example 9, the oxidation catalyst carrier and the selective catalyst reduction carrier can be combined.

FIG. 24 shows Embodiment 10 of the present invention.
The features of the tenth embodiment are as follows. That is, in the catalyst device 9, for example, the first oxidation catalyst carrier 66 and the second oxidation catalyst carrier 67 are sequentially provided in the casing 11 as at least two or more catalyst carriers sequentially from the upstream side to the downstream side of the exhaust gas flow. And the third oxidation catalyst carrier 68 are arranged in series.
The first oxidation catalyst carrier 66 is configured such that the catalyst component (catalyst metal) 40C supported on the inner peripheral surface of the exhaust gas passage hole 40B of the carrier 40A (see FIG. 3) has a relatively low density (coarse). Construction).
The second oxidation catalyst carrier 67 can change the density of the catalyst component (catalyst metal) 40C by changing the amount of the catalyst component (catalyst metal) 40C to be carried on the inner peripheral surface of the exhaust gas passage hole 40B of the carrier 40A and the carrying method. The first oxidation catalyst carrier 66 is configured to have a predetermined height (medium roughness structure).
The third oxidation catalyst carrier 68 has the density of the catalyst component (catalyst metal) 40C changed by changing the amount of the catalyst component (catalyst metal) 40C to be carried on the inner peripheral surface of the exhaust gas passage hole 40B of the carrier 40A and the carrying method. The second oxidation catalyst carrier 67 is configured to have a predetermined height (fine structure).
With such a structure, in the catalyst device 9, the density of the catalyst component can be increased stepwise by the first oxidation catalyst carrier 66, the second oxidation catalyst carrier 67, and the third oxidation catalyst carrier 68. First, after the exhaust gas is roughly purified by the first oxidation catalyst carrier 66 on the upstream side, the exhaust gas is finely purified by the second oxidation catalyst carrier 67 and the third oxidation catalyst carrier 68 on the downstream side. Thus, the purification function of each oxidation catalyst carrier can be fully exerted, the exhaust gas purification performance can be improved as a whole, and the service life of each oxidation catalyst carrier can be extended.
In Example 10, instead of the oxidation catalyst carrier, the selective catalyst reduction carrier can have the same structure.

FIG. 25 shows Embodiment 11 of the present invention.
The features of the eleventh embodiment are as follows. That is, one oxidation catalyst carrier 69 is configured by, for example, the first carrier portion 70A, the second carrier portion 70B, and the third carrier portion 70C sequentially from the upstream side to the downstream side of the exhaust gas flow.
As shown in FIG. 3, the first carrier portion 70A is configured to have a relatively low density of a catalyst component (catalyst metal) 40C (see FIG. 3) supported on the inner peripheral surface of the exhaust gas passage hole 40B of the carrier 40A. (Coarse structure).
The second carrier portion 70B can reduce the density of the catalyst component (catalyst metal) 40C by changing the amount of the catalyst component (catalyst metal) 40C to be carried on the inner peripheral surface of the exhaust gas passage hole 40B of the carrier 40A and the carrying method. The first carrier portion 70A is configured to have a predetermined height (medium roughness structure).
The third carrier portion 70C reduces the density of the catalyst component (catalyst metal) 40C by changing the amount of the catalyst component (catalyst metal) 40C to be carried on the inner peripheral surface of the exhaust gas passage hole 40B of the carrier 40A and the carrying method. The second carrier portion 70B is configured to have a predetermined height (fine structure).
With such a structure, the density of the catalyst component can be increased stepwise in one oxidation catalyst carrier 69, so that the exhaust gas can be efficiently purified by the oxidation catalyst carrier 69. It can be optimally used for vehicles and the like.
In Example 11, instead of the oxidation catalyst carrier, the selective catalyst reduction carrier can have the same structure.

In the present invention, it is also possible to arrange the catalyst carriers in parallel and / or in series, with the catalyst carriers not having the same shape but having a different shape, and having different shapes.

The exhaust gas purification system according to the present invention can be applied not only to four-wheeled vehicles but also to other vehicles such as two-wheeled vehicles and heavy machinery and power generation devices.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 Exhaust gas purification system 5 Exhaust manifold 8 Exhaust pipe 9 Catalytic device (catalytic converter)
DESCRIPTION OF SYMBOLS 11 Casing of catalyst apparatus 12 One side case part 13 Other side case part 17 Coupling means 24 Upstream side connection pipe 25 Downstream side connection pipe 26 1st connection mechanism 27 2nd connection mechanism 40-1 and 40-2 Oxidation catalyst carrier 41 Carrier Holding member 46-1 One side mounting means 46-2 Other side mounting means 47 Exhaust gas guide member 51 Collecting space 52 Internal space 62-1 and 62-2 Selective catalytic reduction carrier

Claims

In an exhaust gas purification system for purifying exhaust gas discharged from an engine into an exhaust pipe, at least two or more catalyst carriers are arranged in parallel in the casing, and the casing is detachably provided on the exhaust pipe. A featured exhaust gas purification system.
In an exhaust gas purification system for purifying exhaust gas discharged from an engine into an exhaust pipe, at least two or more catalyst carriers are arranged in series in the casing, and the casing is detachably provided on the exhaust pipe. A featured exhaust gas purification system.
In an exhaust gas purification system for purifying exhaust gas discharged from an engine into an exhaust pipe, at least two or more catalyst carriers are arranged in parallel and in series in the casing, and the casing is detachably provided on the exhaust pipe. An exhaust gas purification system characterized by that.
The oxidation catalyst carrier and / or the selective catalyst reduction carrier as the at least two or more catalyst carriers are arranged in parallel and / or in series in the casing. The exhaust gas purification system described in 1.