JP2015230132A - Heat medium circulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat medium circulation device capable of effectively heating a heat medium.SOLUTION: An exhaust emission control device 1 includes: an exhaust pipe 3 in which exhaust gas circulates; a reactor 11 that is provided around the exhaust pipe 3, and has a reaction material performing exothermic heat due to a chemical reaction with NHand desorption of NHdue to stored heat in a reversible manner; an adsorber 12 that is connected to the reactor 11 by an introduction pipe 15 capable of circulating NH, and stores NH; and a heat transfer fin 20 that is formed so as to project from an inner peripheral surface 3a of the exhaust pipe 3 toward the inside of the exhaust pipe 3 in at least one of the upstream side and downstream side of the reactor 11.

Description

  The present invention relates to a heat medium distribution device for distributing a heat medium such as exhaust gas discharged from an engine.

As a conventional heat medium distribution device, an oxidation catalyst for purifying exhaust gas from an engine is heated by a chemical heat storage device using ammonia (NH ₃ ) as a reaction medium as described in Patent Document 1, for example. Exhaust gas purifiers are known. An exhaust purification device described in Patent Document 1 includes a reservoir for storing NH ₃ , a reactor connected to the reservoir via an introduction pipe and filled with a reaction material, and exhaust gas from an engine. And an oxidation catalyst as a heating object installed in the flowing pipe.

In such an exhaust purification device, when the temperature of the exhaust gas is low, such as when the engine is started, NH ₃ stored in the reservoir is supplied to the reactor via the introduction pipe, and the supplied NH ₃ and The reaction material in the reactor chemically reacts to generate heat. Since the oxidation catalyst is heated by this heat, a predetermined exhaust gas purification performance is ensured even when the temperature of the exhaust gas is low.

JP 2013-234625 A

  By the way, in the exhaust gas purification apparatus of Patent Document 1, since the reactor is provided on the outer peripheral surface of the pipe, a part of the heat generated in the reactor passes through the part of the pipe that contacts the reactor. It is transmitted along the extending direction and is radiated from the flange formed on the pipe. That is, a part of the heat generated in the reactor is wasted without being used for heating the object to be heated.

  An object of the present invention is to provide a heat medium distribution device that can effectively use heat generated in a reactor.

  The heat medium flow device according to the present invention includes a pipe through which the heat medium flows and a reaction material that is provided around the pipe and that reversibly generates heat due to a chemical reaction with the reaction medium and desorbs the reaction medium due to heat storage. A reactor connected to the reactor by a connecting pipe through which the reaction medium can flow and storing the reaction medium, and an inner surface of the pipe from the inner peripheral surface of the pipe on at least one of the upstream side and the downstream side of the reactor And a heat transfer portion formed so as to protrude toward the surface.

  In the heat medium circulating apparatus according to the present invention, heat is generated in the reactor by a chemical reaction between the reaction medium introduced from the reservoir into the reactor and the reaction material in the reactor. At this time, part of the heat generated in the reactor is transmitted along the direction in which the pipe extends through the portion of the pipe that contacts the reactor. In this heat medium circulation device, since it is provided with a heat transfer portion formed to protrude from the inner peripheral surface of the pipe to the inside of the pipe on at least one of the upstream side and the downstream side of the reactor, it is generated in the reactor. Even if part of the heat is transferred to the pipe, the heat can be transferred to the heat medium in the pipe via the heat transfer section. Therefore, the heat generated in the reactor can be efficiently transmitted to the heat medium, and the heat generated in the reactor can be used effectively.

  In the heat medium flow device according to the present invention, the heat transfer section may have a fin shape extending from the inner peripheral surface of the pipe toward the inner diameter center of the pipe. In this case, it is suitable for efficiently transferring the heat transferred to the pipe to the heat medium.

  In the heat medium circulating apparatus according to the present invention, a heat insulating material may be provided around the pipe at the position where the heat transfer section is formed. In this case, it is possible to suppress heat transmitted to the pipe from being radiated from the outer peripheral portion of the pipe by the heat insulating material provided around the pipe.

  In the heat medium flow device according to the present invention, the heat transfer section may be formed to protrude from the inner peripheral surface of the pipe on the upstream side and the downstream side of the reactor toward the inside of the pipe. In this case, the heat transferred to both the upstream and downstream piping of the reactor can be transferred to the heat medium in the piping via the heat transfer section. Therefore, the heat generated in the reactor can be more efficiently transmitted to the heat medium, and the heat generated in the reactor can be used more effectively.

  In the heat medium flow device according to the present invention, a heating object is provided inside the pipe corresponding to the portion where the reactor is disposed, and the heat transfer section is provided on at least one of the upstream side and the downstream side of the heating object. It may be formed protruding from the inner peripheral surface of the pipe toward the inside of the pipe. In this case, the heat transfer section transfers not only the heat transferred to the upstream or downstream piping of the reactor but also the heat transferred to the upstream or downstream piping of the object to be heated to the heat medium in the piping. be able to. Therefore, for example, when the heating object enters and is arranged inside the pipe in the axial direction from the reactor, the heat generated in the reactor can be used effectively.

  ADVANTAGE OF THE INVENTION According to this invention, the heat carrier distribution apparatus which can utilize effectively the heat which generate | occur | produces in a reactor can be provided.

It is a schematic block diagram which shows the exhaust gas purification apparatus as a heat carrier distribution apparatus which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing of the principal part of the exhaust gas purification apparatus shown in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is a schematic diagram which shows the mode of the heat radiation in the conventional exhaust purification apparatus. It is a schematic sectional drawing of the principal part of the exhaust gas purification apparatus as a heat carrier circulation apparatus which concerns on 2nd Embodiment. It is a schematic sectional drawing of the principal part of the exhaust gas purification apparatus as a heat carrier circulation apparatus which concerns on 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

(First embodiment)
FIG. 1 is a schematic configuration diagram showing an exhaust purification device as a heat medium flow device according to the first embodiment of the present invention. In the figure, an exhaust emission control device 1 is provided in an exhaust system of a diesel engine 2 (hereinafter simply referred to as an engine 2) of a vehicle, and contains harmful substances (environment) contained in exhaust gas that is a heat medium exhausted from the engine 2. It is a device that purifies (pollutants).

  The exhaust purification apparatus 1 includes a heat exchanger 4 and an oxidation catalyst (DOC: DOC) arranged in order from an upstream side to a downstream side in a cylindrical exhaust pipe (pipe) 3 that is an exhaust passage connected to an engine 2. A Diesel Oxidation Catalyst (DPF) 5, a diesel exhaust particulate filter (DPF) 6, a selective catalytic reduction (SCR) 7, and an oxidation catalyst (ASC: Ammonia Slip Catalyst) 8 are provided.

The heat exchanger 4 is a device that transfers heat between the exhaust gas from the engine 2 and a reactor 11 described later, and has a honeycomb structure. The heat exchanger 4 is not limited to the honeycomb structure, and a known heat exchange structure can be used. The oxidation catalyst 5 is a catalyst that oxidizes and purifies HC, CO, and the like contained in the exhaust gas. The DPF 6 is a filter that collects and removes particulate matter PM (Particulate Matter) contained in the exhaust gas. The SCR 7 is a catalyst that reduces and purifies NOx contained in the exhaust gas with urea or ammonia (NH ₃ ). The oxidation catalyst 8 is a catalyst that oxidizes NH ₃ that has passed through the SCR 7 and has flowed downstream of the SCR 7.

  Further, the exhaust purification device 1 includes a chemical heat storage unit 10. The chemical heat storage unit 10 is an apparatus that heats the heat exchanger 4 without energy by storing heat (exhaust heat) of exhaust gas and using the exhaust heat when necessary. The chemical heat storage unit 10 includes a reactor 11 disposed around the heat exchanger 4 and an adsorber (storage) 12 disposed away from the heat exchanger 4.

The reactor 11 includes a reaction material 13 that reversibly generates heat due to a chemical reaction with NH ₃ that is a gaseous reaction medium and desorbs NH 3 due to heat storage. As the reaction material 13, a material having a composition MXa of a halide is used. Here, M is an alkaline earth metal such as Mg, Ca, or Sr, or a transition metal such as Cr, Mn, Fe, Co, Ni, Cu, or Zn. X is Cl, Br, I or the like. a is 2-3. The reactor 11 may include a high thermal conductor such as stainless steel, metal beads, SiC beads, Si beads, carbon beads, and alumina beads.

The adsorber 12 includes an adsorbent 14 that can be held and desorbed by physical adsorption of NH ₃ . As the adsorbent 14, activated carbon, carbon black, mesoporous carbon, nanocarbon, zeolite, or the like is used. Adsorber 12, by physically adsorbed NH ₃ to the adsorbent 14, storing NH _3.

The reactor 11 and the adsorber 12 are connected via an introduction pipe 15 which is a connection pipe capable of circulating NH ₃ . The introduction pipe 15 is provided with an electromagnetic valve 16 that is an on-off valve that opens and closes a flow path between the reactor 11 and the adsorber 12. The solenoid valve 16 is controlled by a controller (not shown).

In such a chemical heat storage unit 10, when the temperature of the exhaust gas from the engine 2 is low, NH ₃ is supplied from the adsorber 12 to the reactor 11 through the introduction pipe 15 by opening the electromagnetic valve 16. The reaction material 13 (for example, MgBr ₂ ) in the reactor 11 and NH ₃ chemically react and chemisorb (coordinate bond), and heat is generated from the reaction material 13. That is, a reaction from the left side to the right side (exothermic reaction) in the following reaction formula (A) occurs. The heat exchanger 4 is heated by the heat generated in the reactor 11 and the exhaust gas is heated via the heat exchanger 4.
MgBr ₂ + xNH ₃ ＭｇMg (NH ₃ ) xBr ₂ + heat (A)

On the other hand, when the temperature of the exhaust gas from the engine 2 increases, exhaust heat is given to the reaction material 13 of the reactor 11 so that the reaction material 13 and NH ₃ are separated. That is, a reaction (regeneration reaction) from the right side to the left side in the above reaction formula (A) occurs. Then, NH ₃ desorbed from the reaction material 13 returns to the adsorber 12 through the introduction pipe 15 and is physically adsorbed (recovered) by the adsorbent 14 of the adsorber 12.

  Then, with reference to FIG.2 and FIG.3, the structure of the principal part of the exhaust gas purification apparatus (heat medium distribution apparatus) 1 which concerns on this embodiment is demonstrated in detail. FIG. 2 is a schematic cross-sectional view of the main part of the exhaust emission control device 1 shown in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  As shown in FIG. 2, the heat exchanger 4 (heating target) is disposed inside the exhaust pipe 3 corresponding to the portion where the reactor 11 is disposed. The heat exchanger 4 can pass exhaust gas flowing through the exhaust pipe 3. The reactor 11 is disposed around the exhaust pipe 3 at the position where the heat exchanger 4 is disposed. The reactor 11 includes an annular case 11a fixed to the outer peripheral surface 3b of the exhaust pipe 3 by welding or the like, and the reaction material 13 filled in the case 11a. That is, the exhaust pipe 3 constitutes an inner cylinder of the reactor 11. The introduction pipe 15 is connected to the case 11a.

  An upstream flange 17 is formed integrally with the exhaust pipe 3 located on the upstream side of the reactor 11. A downstream flange 18 is formed integrally with the exhaust pipe 3 located on the downstream side of the reactor 11. Here, the upstream side and the downstream side refer to the upstream side and the downstream side in the direction in which the exhaust gas flows in the exhaust pipe 3. The upstream flange 17 and the downstream flange 18 are portions for disposing the heat exchanger 4 between the upstream exhaust pipe 3 and the downstream exhaust pipe 3. The exhaust pipe 3 is made of, for example, stainless steel.

  As shown in FIGS. 2 and 3, in the present embodiment, a fin-like heat transfer section is provided on the inner peripheral surface 3 a of the exhaust pipe 3 located on the upstream side of the reactor 11 (heat exchanger 4). A plurality of heat fins 20 are provided. The heat transfer fins 20 are formed so as to protrude from the inner peripheral surface 3 a toward the inside in the radial direction of the exhaust pipe 3. The heat transfer fins 20 are integrally formed with the exhaust pipe 3 by the same material as the exhaust pipe 3. For example, the heat transfer fins 20 are formed of stainless steel, and are connected and fixed to the inner peripheral surface 3a of the exhaust pipe 3 by welding or the like.

  The heat transfer fins 20 preferably have a shape and size that do not affect the flow of exhaust gas inside the exhaust pipe 3. For example, the heat transfer fin 20 is a thin plate member that extends from the inner peripheral surface 3 a toward the inner diameter center P of the exhaust pipe 3. The heat transfer fins 20 are erected on the inner peripheral surface 3 a toward the inner diameter center P of the exhaust pipe 3, and are located in front of the upstream flange 17 from the heat exchanger 4 along the inner peripheral surface 3 a of the exhaust pipe 3. It extends between. The length of the heat transfer fins 20 along the axial direction of the exhaust pipe 3 is not particularly limited to the illustrated length, and may be closer to the heat exchanger 4 or further to the upstream flange 17. It may be close. Further, the length of the heat transfer fin 20 may be shorter than the illustrated length.

  The heat transfer fin 20 includes a side surface 20 a extending in the axial direction and the radial direction of the exhaust pipe 3, and an end surface 20 b toward the inner diameter center P of the exhaust pipe 3. The length of the side surface 20a in the radial direction of the exhaust pipe 3 is, for example, half or less of the inner diameter of the exhaust pipe 3. A plurality of such heat transfer fins 20 are arranged in parallel on the inner peripheral surface 3a of the exhaust pipe 3 at substantially equal intervals. That is, the side surfaces 20a of the plurality of heat transfer fins 20 are separated from each other. The plurality of heat transfer fins 20 are arranged at point-symmetrical positions with the inner diameter center P as the center, for example. That is, the end faces 20b of the plurality of heat transfer fins 20 are separated from each other. Thus, the plurality of heat transfer fins 20 are formed so as not to contact each other.

  Next, with reference to FIG. 4, the effect of the exhaust purification apparatus (heat medium distribution apparatus) 1 which concerns on this embodiment is demonstrated. FIG. 4 is a schematic diagram showing a state of heat dissipation in a conventional exhaust purification device.

  In the conventional exhaust purification apparatus 100, a part of the heat generated in the reactor 11 is transmitted in the extending (axial) direction A of the exhaust pipe 3 through the portion of the exhaust pipe 3 that contacts the reactor 11, Heat is radiated from the upstream flange 17 formed in the pipe 3. As a result, the heat generated in the reactor 11 cannot be efficiently transferred to the heat exchanger 4, and as a result, there is a problem that the exhaust gas cannot be heated efficiently.

  In addition, since the reactor 11 and the exhaust pipe 3 are connected by welding or the like, it is difficult to provide a heat insulating material or the like between the reactor 11 and the exhaust pipe 3, which is effective for the above heat dissipation. There was no proper countermeasure. As a result, in order to appropriately raise the temperature of the exhaust gas in the conventional exhaust purification device 100, the amount of the reaction material 13 in the reactor 11 must be increased, and there is a problem that the reactor 11 increases. It was.

On the other hand, according to the exhaust purification device (heat medium flow device) 1 according to the present embodiment, NH ₃ introduced from the adsorber 12 through the introduction pipe 15 into the reactor 11 and the reaction material in the reactor 11. Due to the chemical reaction with 13, heat is generated in the reactor 11. The exhaust purification apparatus 1 includes the heat transfer fins 20 that protrude from the inner peripheral surface 3a of the exhaust pipe 3 on the upstream side of the reactor 11 toward the inside in the radial direction of the exhaust pipe 3. Even if a part of the heat generated in the heat transfer pipe 11 is transferred to the exhaust pipe 3 connected to the reactor 11, the heat can be transferred to the exhaust gas in the exhaust pipe 3 through the heat transfer fins 20. Therefore, the heat generated in the reactor 11 not only heats the exhaust gas via the heat exchanger 4 but also efficiently transfers the heat generated in the reactor 11 to the exhaust gas. The heat to be used can be used effectively.

  According to the exhaust gas purification apparatus 1, the heat generated in the reactor 11 can be used effectively. As a result, the reaction material 13 mounted on the reactor 11 can be reduced, and thus the increase in the reactor 11 is suppressed. be able to.

  In the exhaust purification device 1, the heat transfer fins 20 extend from the inner peripheral surface 3 a of the exhaust pipe 3 toward the inner diameter center P of the exhaust pipe 3. Therefore, it is suitable for efficiently transferring the heat transferred to the exhaust pipe 3 to the exhaust gas without hindering the flow of the exhaust gas inside the exhaust pipe 3.

  Since the plurality of heat transfer fins 20 are formed so as not to contact each other, the heat transferred to the exhaust pipe 3 is efficiently transmitted to the exhaust gas without obstructing the flow of the exhaust gas inside the exhaust pipe 3. It is suitable for.

(Second Embodiment)
Next, the structure of the exhaust emission control device (heat medium circulation device) according to the second embodiment will be described. The exhaust gas purification apparatus according to the second embodiment includes the reactor 11, the adsorber 12, and the heat transfer fins 20, as in the exhaust gas purification apparatus 1 according to the first embodiment.

  FIG. 5 is a schematic cross-sectional view of a main part of an exhaust purification device as a heat medium circulation device according to the second embodiment. As shown in FIG. 5, the exhaust purification device 1 </ b> B according to the second embodiment is different from the exhaust purification device 1 according to the first embodiment in that a heat insulating material 30 is further provided around the exhaust pipe 3. .

  The heat insulating material 30 is provided around the exhaust pipe 3 at a position where the heat transfer fins 20 are formed. The heat insulating material 30 is wound around the exhaust pipe 3. The heat insulating material 30 extends, for example, so as to cover the space from the upstream flange 17 to the reactor 11 in the exhaust pipe 3. The heat insulating material 30 is composed of a high-performance heat insulating material such as ceramic fiber.

As described above, also in the exhaust gas purification apparatus 1B according to the second embodiment, the reaction is caused by the chemical reaction between NH ₃ introduced from the adsorber 12 through the introduction pipe 15 into the reactor 11 and the reaction material 13 in the reactor 11. Heat is generated in the vessel 11. This exhaust purification apparatus 1B includes the heat transfer fins 20 formed so as to protrude from the inner peripheral surface 3a of the exhaust pipe 3 on the upstream side of the reactor 11 toward the inside in the radial direction of the exhaust pipe 3, so that the reactor Even if a part of the heat generated in the heat transfer pipe 11 is transferred to the exhaust pipe 3 connected to the reactor 11, the heat can be transferred to the exhaust gas in the exhaust pipe 3 through the heat transfer fins 20. Therefore, similarly to the exhaust gas purification apparatus 1 according to the first embodiment, not only the exhaust gas is heated via the heat exchanger 4 by the heat generated in the reactor 11, but also the heat generated in the reactor 11 is efficiently generated. The heat can be transmitted to the exhaust gas, and the heat generated in the reactor 11 can be used effectively.

  Furthermore, according to the exhaust emission control device 1B, the heat transmitted to the exhaust pipe 3 can be prevented from being radiated from the outer peripheral portion of the exhaust pipe 3 by the heat insulating material 30 provided around the exhaust pipe 3.

(Third embodiment)
Next, the structure of the exhaust emission control device (heat medium circulation device) according to the third embodiment will be described. The exhaust gas purification apparatus according to the third embodiment includes the reactor 11, the adsorber 12, and the heat transfer fins 20 as in the exhaust gas purification apparatus 1 according to the first embodiment.

  FIG. 6 is a schematic cross-sectional view of a main part of an exhaust purification device as a heat medium circulation device according to the third embodiment. As shown in FIG. 6, in the exhaust gas purification apparatus 1C according to the third embodiment, in addition to the inner peripheral surface 3a of the exhaust pipe 3 located on the upstream side of the reactor 11 (heat exchanger 4), the reactor 11 It differs from the exhaust gas purification apparatus 1 according to the first embodiment in that the heat transfer fins 20 are also provided on the inner peripheral surface 3a of the exhaust pipe 3 located on the downstream side of the (heat exchanger 4).

  The heat transfer fins 20 on the downstream side of the reactor 11 are at least upstream of the most downstream oxidation catalyst 8. For example, the heat transfer fins 20 are provided on the inner peripheral surface 3 a of the exhaust pipe 3 located on the downstream side of the reactor 11 and on the upstream side of the oxidation catalyst 5. The heat transfer fins 20 are erected on the inner peripheral surface 3 a toward the inner diameter center P of the exhaust pipe 3, from the heat exchanger 4 to the downstream flange 18 along the inner peripheral surface 3 a of the exhaust pipe 3. It extends between. The shape and size of the heat transfer fins 20 on the downstream side of the reactor 11 are the same as the shape and size of the heat transfer fins 20 on the upstream side of the reactor 11.

As described above, also in the exhaust gas purification apparatus 1C according to the third embodiment, the reaction is caused by the chemical reaction between NH ₃ introduced from the adsorber 12 through the introduction pipe 15 into the reactor 11 and the reaction material 13 in the reactor 11. Heat is generated in the vessel 11. This exhaust purification device 1C includes the heat transfer fins 20 that are formed so as to protrude radially inward of the exhaust pipe 3 from the inner peripheral surface 3a of the exhaust pipe 3 on the upstream side and the downstream side of the reactor 11. Even if a part of the heat generated in the reactor 11 is transferred to the exhaust pipe 3 connected to the reactor 11, the heat is transferred to the exhaust gas in the exhaust pipe 3 through these heat transfer fins 20. be able to. Therefore, similarly to the exhaust gas purification apparatus 1 according to the first embodiment, not only the exhaust gas is heated via the heat exchanger 4 by the heat generated in the reactor 11, but also the heat generated in the reactor 11 is efficiently generated. The heat can be transmitted to the exhaust gas, and the heat generated in the reactor 11 can be used effectively.

  Furthermore, according to the exhaust purification device 1C, the heat transmitted to the exhaust pipe 3 on both the upstream side and the downstream side of the reactor 11 is transmitted to the exhaust gas flowing through the exhaust pipe 3 via the heat transfer fins 20. be able to. Thereby, for example, the exhaust gas that could not be warmed by the heat transfer fins 20 on the upstream side of the reactor 11 is warmed by heat transfer via the heat transfer fins 20 on the downstream side of the reactor 11, or the reactor 11 It is possible to keep the exhaust gas warmed by the heat transfer fins 20 on the upstream side by heat transfer through the heat transfer fins 20 on the downstream side of the reactor 11. Therefore, the heat generated in the reactor 11 can be more efficiently transmitted to the exhaust gas, and the exhaust gas can be heated more efficiently.

  As mentioned above, although various embodiment of this invention was described, this invention is not limited to the said embodiment, It deform | transformed in the range which does not change the summary described in each claim, or applied to others It may be a thing.

  For example, the heat transfer fin 20 may be formed on the inner peripheral surface 3 a of the exhaust pipe 3 on at least one of the upstream side and the downstream side of the reactor 11, and is not necessarily inside the exhaust pipe 3 on the upstream side of the reactor 11. It does not need to be formed on the peripheral surface 3a. Further, the heat exchanger 4 may be arranged so as to enter the inside of the exhaust pipe 3 in the axial direction from the reactor 11, for example. At this time, the heat transfer fins 20 are formed so as to protrude from the inner peripheral surface 3 a of the exhaust pipe 3 toward the radially inner side of the exhaust pipe 3 on at least one of the upstream side and the downstream side of the heat exchanger 4. In this case, not only the heat transferred to the exhaust pipe 3 upstream or downstream of the reactor 11 by the heat transfer fins 20 but also the heat transferred to the exhaust pipe 3 upstream or downstream of the heat exchanger 4 is exhausted. The heat can be transmitted to the exhaust gas in the pipe 3, and the heat generated in the reactor 11 can be used effectively.

  In the above embodiment, the heat transfer fin 20 that is a fin-shaped heat transfer portion is a thin plate member that extends from the inner peripheral surface 3 a of the exhaust pipe 3 toward the inner diameter center P of the exhaust pipe 3. Although it has been erected on the inner peripheral surface 3a toward the center P, it is not limited thereto. For example, the heat transfer fin 20 is formed by arranging a member formed by integrally bending a plurality of fins along the inner peripheral surface 3a of the exhaust pipe 3, and welding the member and the inner peripheral surface 3a. It may be formed.

The reaction medium introduced into the reactor 11 is not limited to NH ₃ , and may be H ₂ O, for example. In this case, as the reaction material to _{H 2} o and a chemical reaction, using CaO, MnO, CuO, _Al 2 _{O 3,} or the like.

  Moreover, in the said embodiment, although the reactor 11 was arrange | positioned around the exhaust pipe 3 in the position where the heat exchanger 4 is arrange | positioned, it is not restricted to this. For example, you may arrange | position around the exhaust pipe 3 in the position where the oxidation catalyst 5 is arrange | positioned. In this case, the oxidation catalyst 5 becomes a heating object provided in the exhaust pipe 3 corresponding to the portion where the reactor 11 is disposed. That is, the reactor 11 is not limited to the one that heats the heat exchanger 4, and can also be applied to one that heats other parts provided in the exhaust system of the engine 2 such as the oxidation catalyst 5 of the exhaust pipe 3. is there. Moreover, the reactor 11 is applicable also to what heats the part in the exhaust pipe 3 in which the heating target object does not exist. Further, the heat medium is not limited to the exhaust gas, and may be, for example, exhaust oil flowing in the pipe.

  DESCRIPTION OF SYMBOLS 1,1B, 1C ... Exhaust gas purification apparatus (heat medium distribution apparatus), 3 ... Exhaust pipe (pipe), 3a ... Inner peripheral surface, 4 ... Heat exchanger (heating object), 11 ... Reactor, 12 ... Adsorber (Reservoir), 13 ... reactive material, 15 ... introducing pipe (connecting pipe), 20 ... heat transfer fin (heat transfer part), 30 ... heat insulating material, P ... center of inner diameter.

Claims (5)

Piping through which the heat medium flows;
A reactor provided around the pipe and having a reaction material that reversibly generates heat due to a chemical reaction with the reaction medium and desorption of the reaction medium due to heat storage;
A reservoir connected to the reactor by a connecting pipe capable of circulating the reaction medium, and storing the reaction medium;
A heat transfer section formed to protrude from the inner peripheral surface of the pipe toward the inside of the pipe on at least one of the upstream side and the downstream side of the reactor;
A heat medium distribution device comprising: The heat transfer section has a fin shape extending from the inner peripheral surface of the pipe toward the inner diameter center of the pipe.
The heat medium distribution apparatus according to claim 1.   The heat medium distribution device according to claim 1, wherein a heat insulating material is provided around the pipe at a position where the heat transfer unit is formed. The heat transfer section is formed to protrude from the inner peripheral surface of the pipe on the upstream side and the downstream side of the reactor toward the inside of the pipe.
The heat carrier circulating apparatus according to any one of claims 1 to 3. A heating object is provided inside the pipe corresponding to the portion where the reactor is disposed,
The heat transfer section is formed to protrude from the inner peripheral surface of the pipe toward the inside of the pipe on at least one of the upstream side and the downstream side of the heating object.
The heat carrier circulating apparatus according to any one of claims 1 to 4.

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