JP7159553B2 - Exhaust purification device - Google Patents

Description

The present application relates to an exhaust purification device.

Patent Literature 1 describes a heat storage material formed as a honeycomb structure having a plurality of cells partitioned by ceramic partition walls and penetrating from one end face to the other end face in the axial direction and having a plurality of cells through which a fluid flows. .

Patent Document 2 describes a main body of a heat storage material having a honeycomb structure, in which a fluid channel through which a fluid flows and a heat storage medium section in which a medium for storing the heat is enclosed are formed. The heat storage medium portion is formed by plugging both end faces of the honeycomb.

JP 2012-255105 A JP 2011-52919 A

In the technique described in Patent Document 1, the partition is arranged so that a plurality of cells communicating between two end surfaces (an inlet end surface and an outlet end surface) are formed, and the interior of the partition is filled with a latent heat storage material. It is Thus, in the structure in which the partition walls are filled with the latent heat storage material, the partition walls are substantially impregnated with the latent heat storage material, and the latent heat storage material may leak out.

In the technology described in Patent Document 2, the plugged cells of the honeycomb structure are provided with a heat storage medium, and the heat storage medium exchanges heat with the exhaust gas through the partition walls of the honeycomb structure. bad.

As described above, the techniques described in any of the patent documents have room for improvement in terms of efficiently exchanging the heat of the exhaust gas with the heat storage material and suppressing leakage of the heat storage material.

An object of the present invention is to efficiently exchange the heat of the exhaust gas with the heat storage material and to suppress the leakage of the heat storage material.

In a first aspect, an exhaust pipe through which exhaust flows; a catalyst carrier provided inside the exhaust pipe and having a honeycomb shape through which the exhaust passes and carrying a catalyst for purifying the exhaust; a heat storage material assembly in which a heat storage material container in which the heat storage material is enclosed is gathered in a honeycomb shape through which the exhaust gas passes.

In this exhaust purification device, the catalyst supported on the catalyst carrier can purify the exhaust gas flowing through the exhaust pipe. Since the catalyst carrier has a honeycomb shape through which the exhaust gas passes, the exhaust gas in the exhaust pipe smoothly passes through the catalyst carrier.

A heat storage material assembly is provided inside the exhaust pipe. Since the heat storage material containers of the heat storage material assembly are gathered in a honeycomb shape through which the exhaust gas passes, the exhaust gas in the exhaust pipe smoothly passes through the heat storage material assembly. Since the heat storage material is enclosed in the heat storage material container, leakage of the heat storage material is suppressed. Since the exhaust gas passes through the heat storage material assembly, heat can be exchanged efficiently between the exhaust gas and the heat storage material.

In a second aspect according to the first aspect, each of the plurality of exhaust passages in the catalyst carrier is aligned with one of the plurality of exhaust passages in the heat storage material assembly when viewed in the flow direction of the exhaust gas. It is a shape that fits.

Therefore, it is possible to suppress an increase in resistance (pressure loss) to the flow of exhaust gas due to the presence of the heat storage material sintered body.

In a third aspect, in the first or second aspect, the catalyst carrier and the heat storage material assembly are in contact with each other in the flow direction of the exhaust gas.

As a result, the heat of the heat storage material assembly can be directly transferred to the catalyst carrier, and the efficiency of heat transfer is high compared to a structure in which the heat storage material assembly is separated from the catalyst carrier.

In a fourth aspect, in any one of the first to third aspects, the catalyst is also supported on the outside of the heat storage material containers that are concentrated.

Exhaust gas can be purified not only by the catalyst supported on the catalyst carrier, but also by the catalyst supported on the outside of the heat storage material container.

In the fifth aspect, the exhaust passes through an exhaust pipe through which the exhaust flows, and a heat storage material container provided inside the exhaust pipe, in which the heat storage material is sealed and in which a catalyst for purifying the exhaust is supported on the outside. and a heat storage material assembly that is gathered in a honeycomb shape.

In this exhaust purification device, a heat storage material assembly is provided inside the exhaust pipe. Since the heat storage material containers are gathered in a honeycomb shape through which the exhaust gas passes, the exhaust gas in the exhaust pipe smoothly passes through the heat storage material assembly. Since the exhaust gas passes through the heat storage material assembly, heat can be exchanged efficiently between the exhaust gas and the heat storage material.

Since the catalyst is supported on the outside of the heat storage material container, the catalyst can purify the exhaust gas.

Since the heat storage material is enclosed in the heat storage material container, leakage of the heat storage material is suppressed. Since the heat storage material and the catalyst are located close to each other between the inside and the outside of the heat storage material container, the heat of the heat storage material is efficiently transferred to the catalyst compared to a structure in which the heat storage material and the catalyst are separated. be able to.

In a sixth aspect, in any one of the first to fifth aspects, the heat storage material assembly is a heat storage material sintered body obtained by sintering a plurality of heat storage material containers.

With the heat storage material sintered body, a plurality of heat storage material containers can be sintered and maintained in a single shape. Since a plurality of heat storage material containers are sintered and an adhesive or the like for gathering the heat storage material containers is unnecessary, a large surface area of the heat storage material containers can be secured. As a result, it becomes possible to support a large amount of catalyst on the surface of the heat storage material container and efficiently transfer heat between the inside and the outside of the heat storage material container.

In a seventh aspect, in any one of the first to sixth aspects, the heat storage material container is made of ceramic.

Compared to a configuration in which the heat storage material container is made of metal, for example, the heat storage material container is made of ceramic, so it is easy to maintain high resistance to exhaust gas.

In an eighth aspect, in any one of the first to seventh aspects, the heat storage material is a latent heat storage material having a melting point equal to or higher than the activation temperature of the catalyst.

That is, the temperature at which the heat storage material undergoes a phase change from the liquid phase to the solid phase is equal to or higher than the activation temperature of the catalyst. The solidification heat of the heat storage material makes it easier to maintain the catalyst at the activation temperature or higher, and the catalyst can efficiently purify the exhaust gas.

The heat of the exhaust gas can be efficiently exchanged with the heat storage material, and leakage of the heat storage material can be suppressed.

FIG. 1 is a cross-sectional view showing the exhaust purification device of the first embodiment along the longitudinal direction of the exhaust pipe. FIG. 2 is a perspective view showing the catalyst carrier of the exhaust purification device of the first embodiment. FIG. 3 is a front view showing a partially enlarged catalyst carrier of the exhaust purification device of the first embodiment. FIG. 4 is a partially enlarged front view showing an example different from FIG. 3 of the catalyst carrier of the exhaust purification device of the first embodiment. FIG. 5 is a partially enlarged front view showing an example different from FIGS. 3 and 4 of the catalyst carrier of the exhaust purification device of the first embodiment. FIG. 6 is a perspective view showing the heat storage material sintered body of the exhaust purification device of the first embodiment. FIG. 7 is a front view showing a partially enlarged heat storage material sintered body of the exhaust purification device of the first embodiment. FIG. 8 is a front view showing the heat storage material sintered body of the exhaust gas purifying device of the first embodiment further enlarged from FIG. FIG. 9 is a perspective view showing a partially broken heat storage material container of the exhaust emission control device of the first embodiment. FIG. 10 is a cross-sectional view showing the exhaust purification device of the second embodiment along the longitudinal direction of the exhaust pipe. FIG. 11 is a partially broken perspective view showing an example of a heat storage material container applicable to the exhaust emission control system of the first embodiment, different from FIG. 9 . FIG. 12 is an explanatory diagram showing the relationship between the gaps of the catalyst carrier and the gaps of the heat storage material sintered body in the exhaust emission control system of the first embodiment. FIG. 13 is an explanatory diagram showing a first modification different from FIG. 12 of the relationship between the gap between the catalyst carrier and the gap between the heat storage material sintered body in the exhaust purification system of the first embodiment. FIG. 14 is an explanatory diagram showing a second modification different from FIGS. 12 and 13 of the relationship between the gap between the catalyst carrier and the gap between the heat storage material sintered body in the exhaust purification system of the first embodiment.

Hereinafter, the exhaust purification device 12 of the first embodiment will be described with reference to the drawings.

Exhaust purification device 12 is applied to an automobile having an engine, for example. In a first embodiment, as shown in FIG. 1, an exhaust purification device 12 has a catalyst carrier 16 mounted inside an exhaust pipe 14 of an automobile. The catalyst carrier 16 is made of ceramic or metal, for example.

In the example shown in FIG. 1, the exhaust pipe 14 has a substantially cylindrical shape, but a portion in the longitudinal direction is a large-diameter pipe 14B having a larger diameter than the other portions. The catalyst carrier 16 is arranged in the large-diameter pipe 14B.

In the following description, the terms "upstream side" and "downstream side" respectively refer to the upstream side and the downstream side in the flow direction of exhaust gas in the exhaust pipe 14 (arrow F1 direction).

In the first embodiment, as also shown in FIGS. 2 and 3, the catalyst carrier 16 is a cylindrical member that contacts the inner peripheral surface of the large-diameter pipe 14B and has a honeycomb inside. The "honeycomb shape" means that the exhaust flow path in the catalyst carrier 16 is divided into a plurality of parts when viewed in the exhaust flow direction (arrow F1 direction) by the plurality of walls 20 extending in the exhaust flow direction. Shape. In particular, in the present embodiment, the structure is such that exhaust passages (gap GP) having a constant shape are patterned and aligned when viewed in the flow direction of the exhaust. Therefore, the exhaust gas can pass through the gap GP created between the walls 20 and flows along the walls 20 as the exhaust gas passes through the gap GP in this way. That is, in the range where the honeycomb-shaped catalyst carrier 16 exists, the area of the members with which the exhaust gas contacts is increased.

The catalyst carrier 16 carries a catalyst 18 (see FIG. 3) for purifying exhaust gas discharged from the engine.

The shape of the wall when viewed in the exhaust flow direction may be, for example, a square shape (lattice shape) as shown in FIG. 5 may be triangular. Since the catalyst carrier 16 is formed in various honeycomb shapes to secure a large surface area, a large amount of the catalyst 18 can be carried on the surface. By passing the exhaust gas through the gap GP of the catalyst carrier 16, the exhaust gas is brought into contact with the catalyst 18 carried in such a large amount, and the exhaust gas can be purified efficiently. 4 and 5, hatching of the wall 20 and illustration of the catalyst 18 are omitted.

As shown in FIG. 1, inside the large-diameter pipe 14B, a heat storage material sintered body 24 is arranged upstream of a portion where the catalyst carrier 16 is arranged. In the example shown in FIG. 1, the heat storage material sintered body 24 is in contact with the catalyst carrier 16 in the flow direction of the exhaust gas.

As shown in FIG. 8, the heat storage material sintered body 24 is a member formed into an integral shape by sintering a plurality of heat storage material containers 34, and is an example of a heat storage material assembly.

As shown in FIG. 9, the heat storage material container 34 is a container in which a heat storage material 36 is enclosed. In the example shown in FIG. 9, the heat storage material container 34 has a spherical outer shell 38, and the outer diameter of the outer shell 38 is, for example, about 1 to 10 μm. The material of the outer shell 38 of the heat storage material container 34 may be, for example, metal, but is ceramic in this embodiment. A heat storage material 36 is enclosed inside the outer shell 38 . The heat storage material 36 receives heat from the high-temperature exhaust gas and can store the heat, and can release the stored heat to a low-temperature environment. A plurality of catalysts 18 are also carried on the outside of the outer shell 38 of the heat storage material container 34 .

The heat storage material sintered body 24 is formed by integrating a plurality of heat storage material containers 34 by sintering. As shown in FIG. 7, the heat storage material sintered body 24 as a whole has a honeycomb shape like the catalyst carrier 16 and has a plurality of wall bodies 40 . Therefore, the exhaust gas can pass through the gap GQ of the wall 40 of the heat storage material sintered body 24 . The gap GQ forms an exhaust flow path in the heat storage material sintered body 24 when viewed in the exhaust flow direction (arrow F1 direction).

In this embodiment, the shape of the honeycomb-shaped sintered heat storage material 24 when viewed in the flow direction of the exhaust gas is the same as the shape of the catalyst carrier 16 when viewed in the flow direction of the exhaust gas. That is, in the present embodiment, as also shown in FIG. 12, the gap GQ, which is the exhaust flow path in the heat storage material sintered body 24, has the same shape (square shape) as the gap GP, which is the exhaust flow path in the catalyst carrier 16. be. The plurality of gaps GQ and the plurality of gaps GP correspond one-to-one, and the centers of corresponding gaps GQ and gaps GP are aligned. Therefore, the gap GQ and the gap GP are continuous with the same shape when viewed in the flow direction of the exhaust gas. In other words, the region occupied by the catalyst carrier 16 (the region through which the exhaust gas cannot pass) is the same as the region occupied by the heat storage material sintered body 24 when viewed in the flow direction of the exhaust gas. Therefore, the structure is such that the resistance (pressure loss) to the flow of the exhaust gas does not increase due to the presence of the heat storage material sintered body 24 .

In order to suppress the situation where the resistance to the flow of the exhaust gas increases due to the presence of the heat storage material sintered body 24, the shape of the gap GQ when viewed in the flow direction of the exhaust gas should be adjusted to the gap GP does not have to match the shape of the That is, even if the shape of the gap GQ seen in the flow direction of the exhaust gas is larger than the shape of the gap GP, the presence of the heat storage material sintered body 24 increases the resistance to the flow of the exhaust gas. , can be realized by the structure shown in FIG. In the first modification shown in FIG. 13, the gap GQ has a rectangular shape with vertical sides approximately twice as long as in the example shown in FIG. 12 when viewed in the flow direction of the exhaust gas. Two gaps GP are accommodated in one gap GQ. Also, in the second modification shown in FIG. 14, the gap GQ is a square whose vertical and horizontal sides are approximately twice as long as those in the example shown in FIG. 12 when viewed in the exhaust flow direction. One gap GQ contains four gaps GP. In this way, if each of the plurality of gaps GP has a shape that fits (does not protrude) into one of the plurality of gaps GQ, a portion of the heat storage material sintered body 24 fills the gap GP in the flow direction of the exhaust gas. Since it is not closed, an increase in pressure loss due to the heat storage material sintered body 24 can be suppressed. Although FIGS. 12 to 14 show the range in which the gaps GP appear in a 4×4 matrix, the catalyst carrier 16 actually has a shape with more gaps GP.

Even when the shape of the catalyst carrier 16 viewed in the flow direction of the exhaust gas is the shape shown in FIGS. It has a shape that suppresses the resistance increase of That is, the heat storage material sintered body 24 is shaped such that each of the plurality of gaps GP of the catalyst carrier 16 is accommodated (does not protrude) into one of the plurality of gaps GQ of the heat storage material sintered body 24. .

Since the catalyst carrier 16 and the heat storage material sintered body 24 are both honeycomb-shaped, the catalyst carrier 16 and the heat storage material sintered body 24 form a honeycomb structure portion 42 inside the exhaust pipe 14 . It can be said that the structure is In the first embodiment, the heat storage material sintered body 24 is formed from the upstream end portion 42A to the intermediate portion 42C of the honeycomb structure portion 42, and the catalyst carrier 16 is formed from the intermediate portion 42C to the downstream end portion 42B. is.

Next, the operation of this embodiment will be described.

As shown in FIG. 1 , the exhaust gas flowing through the exhaust pipe 14 passes through the heat storage material sintered body 24 . Since the heat storage material 36 is enclosed in the plurality of heat storage material containers 34 of the heat storage material sintered body 24 as shown in FIG. For example, when the temperature of the exhaust gas is higher than the temperature of the heat storage material 36, heat is transferred from the exhaust gas to the heat storage material 36. Conversely, when the temperature of the exhaust gas is lower than the temperature of the heat storage material 36, heat is transferred from to the exhaust.

As shown in FIG. 7, the heat storage material sintered body 24 is formed in a honeycomb shape by sintering the heat storage material container 34 . Therefore, the exhaust in the exhaust pipe 14 smoothly passes through the gap GQ of the heat storage material sintered body 24 .

Since the exhaust smoothly passes through the heat storage material sintered body 24 , heat can be efficiently exchanged between the exhaust and the heat storage material 36 .

Moreover, the heat storage material 36 is sealed in the heat storage material container 34 as shown in FIG. Therefore, leakage of the heat storage material 36 is suppressed. Since the heat storage material 36 does not directly contact the exhaust gas, it does not react with the exhaust gas.

In the exhaust pipe 14 the exhaust gas also passes through a catalyst carrier 16 . Exhaust gas can be purified by the catalyst 18 carried on the catalyst carrier 16 . Since the catalyst carrier 16 also has a honeycomb shape similar to the heat storage material sintered body 24, the exhaust smoothly passes through the gap GP (see FIG. 3) of the catalyst carrier 16. As shown in FIG. For example, even when the engine speed and generated torque are high and the pressure of the exhaust gas is high, the exhaust gas can flow smoothly through the exhaust pipe 14 . In other words, even under conditions where high torque and high rotation are required and the flow rate of the exhaust gas flowing through the exhaust pipe 14 is large, the pressure loss to the exhaust gas is reduced and the output torque and rotation speed of the engine are improved. It is possible to reduce the impact.

As described above, in this embodiment, when high-temperature exhaust flows through the exhaust pipe 14 , the heat of the exhaust can be efficiently stored in the heat storage material 36 .

For example, when the engine is stopped while the heat is stored in the heat storage material 36 , the exhaust gas stops flowing through the exhaust pipe 14 . In this case, the heat stored in the heat storage material 36 acts on the catalyst 18 of the catalyst carrier 16 to suppress the temperature drop of the catalyst 18 . The temperature of the catalyst 18 can be maintained high, for example, at the activation temperature or higher for a long period of time as compared with an exhaust purification device having no heat storage material 36 . This "activation temperature" is the lower limit temperature at which the catalyst 18 exhibits a high effect of purifying exhaust gas.

For example, even if the stopped engine is restarted and low-temperature exhaust flows through the exhaust pipe 14, if the temperature of the catalyst 18 of the catalyst carrier 16 is maintained high, the catalyst 18 has the effect of purifying the exhaust gas. can be highly exhibited.

Furthermore, when a catalytic reaction with the catalyst 18 occurs in the heat storage material sintered body 24, the temperature of the passing exhaust gas can be raised by this catalytic reaction. Then, by causing the heat of the exhaust gas whose temperature has been raised to act on the catalyst 18 of the catalyst carrier 16, it is possible to suppress the temperature drop of the catalyst 18 of the catalyst carrier 16 and shorten the temperature rise time. is.

In this embodiment, the heat storage material sintered body 24 is in contact with the catalyst carrier 16 in the flow direction of the exhaust gas. Therefore, the heat of the heat storage material sintered body 24 can be directly transmitted to the catalyst 18 of the catalyst support 16, and the heat storage material sintered body 24 is separated from the catalyst support 16 (not in contact). high heat transfer efficiency compared to

As described above, in the present embodiment, when high-temperature exhaust gas flows through the exhaust pipe 14, the heat of the exhaust gas can be efficiently applied to the heat storage material 36 and stored. By allowing the heat stored in the heat storage material 36 to act on the catalyst of the catalyst carrier 16, the effect of the catalyst in purifying the exhaust gas can be maintained at a high level.

Further, in the present embodiment, both the catalyst carrier 16 and the sintered heat storage material 24 are honeycomb-shaped, and the shape of the catalyst carrier 16 and the sintered heat storage material 24 when viewed in the flow direction of the exhaust gas is is the same in Therefore, the presence of the heat storage material sintered body 24 suppresses an increase in the resistance (pressure loss) to the flow of the exhaust gas, thereby realizing a smooth flow of the exhaust gas.

Next, a second embodiment will be described. In the second embodiment, elements, members, and the like that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 10, the exhaust purification device 52 of the second embodiment also has a honeycomb-shaped heat storage material sintered body 24 . In the second embodiment, the heat storage material sintered body 24 is provided in the honeycomb structure portion 42 from the upstream end portion 42A to the downstream end portion 42B. In other words, the entire honeycomb structure portion 42 is configured by the heat storage material sintered body 24 .

In the exhaust gas purification device 52 of the second embodiment configured as described above, the exhaust gas flowing through the exhaust pipe 14 passes through the heat storage material sintered bodies 24 and passes through the heat storage material 36 enclosed in the plurality of heat storage material containers 34. can exchange heat with

Since the heat storage material sintered body 24 is formed in a honeycomb shape by sintering the heat storage material container 34 , the exhaust gas can smoothly pass through and the heat storage material 36 can efficiently exchange heat. Since the heat storage material 36 is enclosed in the heat storage material container 34, leakage of the heat storage material 36 is suppressed.

In the second embodiment, the heat storage material container 34 supporting the catalyst 18 is arranged in the entire honeycomb structure 42 (from the upstream end 42A to the downstream end 42B). This catalyst 18 can purify the exhaust gas.

Since the heat storage material 36 can store heat by receiving the heat of the exhaust gas, this heat acts on the catalyst 18 to suppress the temperature drop of the catalyst 18. For example, the temperature of the catalyst 18 can be maintained at the activation temperature or higher for a long period of time. can. Even if low-temperature exhaust flows through the exhaust pipe 14 when the engine is restarted, if the temperature of the catalyst 18 in the heat storage material container 34 is maintained high, the effect of purifying the exhaust can be highly exhibited.

When the exhaust gas reacts with the catalyst 18 on the upstream side of the heat storage material sintered body 24, reaction heat is generated. There is also the effect of suppressing the temperature drop of the catalyst 18 on the downstream side of the heat storage material sintered body 24 due to the exhaust gas whose temperature has been raised by this reaction heat.

In addition, in the first embodiment, it is also possible to use the heat storage material container 54 of the modification shown in FIG. The heat storage material container 54 has a structure in which the catalyst 18 is not supported on the outside of the outer shell 38 . Even with such a structure using a heat storage material sintered body obtained by sintering the heat storage material container 54, exhaust gas can be purified by the catalyst 18 of the catalyst carrier 16 positioned downstream. On the other hand, in the heat storage material sintered body 24 using the heat storage material container 34 shown in FIG.

In each of the above-described embodiments, the material of the outer shell 38 of the heat storage material container 34 may be, for example, metal. In addition, falling off of the catalyst 18 from the outer shell 38 can be suppressed.

Further, by making the outer shell 38 of ceramic, it is possible to suppress deterioration due to contact with exhaust gas, compared to, for example, metal. By suppressing the deterioration of the outer shell 38, the heat storage material 36 can be kept sealed with the outer shell 38 for a long period of time.

In the exhaust purification device of the above-described embodiment, the heat storage material sintered body 24 obtained by sintering the heat storage material container 34 was exemplified as the heat storage material aggregate. is not limited to 24. For example, a heat storage material assembly in which a plurality of heat storage material containers 34 are adhered with an adhesive and formed into a predetermined shape may be used. In the heat storage material sintered body 24 of each of the above-described embodiments, a member such as an adhesive for fixing the heat storage material container 34 to each other is unnecessary, so that efficient heat exchange between the exhaust gas and the heat storage material 36 is possible. be.

In the exhaust gas purifiers of the above-described embodiments, the heat storage material 36 is not particularly limited as long as it can receive and store heat from high-temperature exhaust gas and can dissipate heat to low-temperature exhaust gas. For example, a molten salt having a melting point in the range of 100° C. or higher and 600° C. or lower can be used. Molten salt is a substance that melts salts and oxides that are solid at room temperature to liquid by heating, and is composed of cations and anions. Then, the enthalpy changes with the phase change (melting, primary transition, or secondary transition) to store and release heat.

In each embodiment, the phase change of the heat storage material 36 when heat is actually stored and released may be melting accompanied by a phase transition between a solid phase and a liquid phase, and the heat storage material stores and releases heat as latent heat during the phase change. . Alternatively, heat may be stored and released by a phase change that does not involve a phase transition between a solid phase and a liquid phase.

The phase change temperature of the heat storage material 36 is preferably a temperature equal to or higher than the activation temperature of the catalyst 18 . As a result, the temperature of the heat storage material 36 at the time of phase transition becomes equal to or higher than the activation temperature of the catalyst 18, so that the catalyst 18 can easily maintain a state in which it can efficiently purify the exhaust gas.

Even in a temperature range in which the heat storage material does not undergo a phase transition, heat is stored and released as sensible heat.

Among molten salts, in particular, molten salts having a phase change temperature in the range of 100° C. or higher and 600° C. or lower can efficiently perform heat exchange with the exhaust gas, and can be preferably applied to the exhaust gas purifiers of the embodiments and modifications. .

Note that, depending on the type of molten salt, there is also a molten salt that undergoes a volume change due to a phase change. In the case of using a molten salt whose volume changes, the heat storage material container 34 should have a sufficient volume inside the outer shell 38 so as to absorb the volume change of the molten salt.

12 Exhaust purification device 14 Exhaust pipe 16 Catalyst carrier 18 Catalyst 24 Heat storage material sintered body 34 Heat storage material container 36 Heat storage material 38 Outer shell 42 Honeycomb structure 42A Upstream end 42B Downstream end 42C Intermediate portion 52 Exhaust purification device 54 heat storage material container

Claims (8)

an exhaust pipe through which exhaust flows;
a catalyst carrier that is provided inside the exhaust pipe, has a honeycomb shape through which the exhaust passes, and carries a catalyst that purifies the exhaust;
By sintering and integrating a plurality of heat storage material containers provided inside the exhaust pipe and containing the heat storage material, the heat storage material containers form a honeycomb shape through which the exhaust gas passes. a heat storage material aggregate having a
Exhaust purification device having. 2. The exhaust gas purification system according to claim 1, wherein each of the plurality of exhaust passages in the catalyst carrier has a shape that fits in one of the plurality of exhaust passages in the heat storage material assembly when viewed in the flow direction of the exhaust gas. Device. 3. The exhaust emission control system according to claim 1, wherein said catalyst carrier and said heat storage material assembly are in contact with each other in the flow direction of said exhaust gas. 4. The exhaust emission control system according to claim 1, wherein the catalyst is also supported on the outside of the heat storage material containers that are concentrated. an exhaust pipe through which exhaust flows;
By sintering and integrating a plurality of heat storage material containers, which are provided inside the exhaust pipe and in which a heat storage material is enclosed and a catalyst for purifying exhaust gas is supported on the outside, the heat storage material container , a heat storage material aggregate formed in a honeycomb shape through which the exhaust gas passes;
Exhaust purification device having. The exhaust emission control device according to any one of claims 1 to 5, wherein the heat storage material assembly is a heat storage material sintered body obtained by sintering a plurality of heat storage material containers. 7. The exhaust purification device according to claim 1, wherein the heat storage material container is made of ceramic. The exhaust emission control system according to any one of claims 1 to 7, wherein the heat storage material is a latent heat storage material having a melting point equal to or higher than an activation temperature of the catalyst.

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