JP6079557B2 - Chemical heat storage device - Google Patents

Description

  The present invention relates to a chemical heat storage device used for heating a heating object provided in an exhaust system of an engine.

  As a conventional chemical heat storage device, for example, a device described in Patent Document 1 is known. In the chemical heat storage device described in Patent Document 1, a reactor in which a heat storage material is stored is arranged on the outer periphery of a catalyst (heating target), and the catalyst is heated using reaction heat due to a chemical reaction of the heat storage material. In such a chemical heat storage device, when the temperature of the catalyst is less than the activation temperature, for example, at the start of the engine, the heat storage material and the reaction medium are chemically reacted and the catalyst is heated by the reaction heat ( When the temperature of the exhaust gas is higher than a predetermined temperature, the heat of the exhaust gas is transmitted to the heat storage material, and the reaction medium is separated from the heat storage material by the heat (regeneration reaction).

JP 59-208118 A

  However, in the conventional chemical heat storage device, the heat conductivity of the heat storage material in the reactor is low. For this reason, during the exothermic reaction, the reaction heat generated in the heat storage material is not easily transmitted to the catalyst, and it takes time to heat the catalyst to the activation temperature. During the regeneration reaction, it is difficult for heat from the exhaust gas to be transmitted to the heat storage material, and it takes time for the reaction medium to be separated from the heat storage material.

  Then, the objective of this invention is providing the chemical heat storage apparatus which can improve the thermal conductivity in a reactor.

  A chemical heat storage device according to one aspect of the present invention is a chemical heat storage device that heats a heating target provided inside an exhaust pipe that forms an exhaust system of an engine, and is disposed around the exhaust pipe, and is a reaction medium. Reactor that stores heat storage material that generates heat by chemical reaction with, storage device that stores reaction medium, and connection between the reactor and the reservoir, and the reaction medium moves between the reactor and the reservoir A connecting pipe for causing The heat storage material includes a sheet-like high heat conduction member having a higher thermal conductivity than the heat storage material. Each of the plurality of bent portions formed by bending the high heat conductive member is positioned on the outer peripheral surface side of the reactor to which the connection pipe is connected or on the inner peripheral surface side of the reactor in contact with the exhaust pipe. A plurality of heat conducting surfaces are formed and extend from the outer peripheral surface side to the inner peripheral surface side.

  In the chemical heat storage device having such a configuration, when the temperature of the catalyst is less than the activation temperature, for example, when starting the engine, the reaction medium is supplied from the reservoir to the reactor, and the heat storage material, the reaction medium, The object to be heated is heated by the heat of reaction when a chemical reaction occurs. On the other hand, when the temperature of the exhaust gas is higher than a predetermined temperature, the heat storage material and the reaction medium are separated by heat from the exhaust gas, and the reaction medium is absorbed by the reservoir. The reactor arranged around the exhaust pipe stores a heat storage material containing a sheet-like high heat conduction member having a higher thermal conductivity than the heat storage material. A plurality of heat conducting surfaces extending to the peripheral surface side are formed. For this reason, the heat generated in the heat storage material is transferred to the object to be heated through the high heat conductive member, and the heat from the exhaust gas is transferred to the heat storage material through the high heat conductive member. Improves. As a result, during the exothermic reaction, reaction heat generated in the heat storage material is easily transmitted to the object to be heated, so that the object to be heated can be efficiently heated. Moreover, since heat from the exhaust gas is easily transmitted to the heat storage material during the regeneration reaction, the reaction medium can be efficiently separated from the heat storage material.

  In one embodiment, the high heat conduction member may further form a flat surface substantially parallel to the outer peripheral surface of the exhaust pipe.

  In such a chemical heat storage device, heat can be more efficiently transferred to the portion where the flat surface is formed, and heat from the portion where the flat surface is formed can be more efficiently absorbed. Can do.

  In one embodiment, the flat surface may be provided adjacent to a bent portion located on the inner peripheral surface side.

  In such a chemical heat storage device, the heating object provided on the inner peripheral surface side of the reactor can be heated more efficiently, and from the exhaust gas passing through the inner peripheral surface side of the reactor. Heat can be absorbed more efficiently.

  Moreover, in one Embodiment, the bending part of the high heat conductive member may be exposed from the thermal storage material.

  In such a chemical heat storage device, heat can be more efficiently transferred to the portion where the heat storage material is exposed, and heat from the portion where the heat storage material is exposed can be absorbed more efficiently. Can do.

  Moreover, in one Embodiment, the bending part located in the inner peripheral surface side among the bending parts of a highly heat-conductive member may be exposed from the thermal storage material.

  In such a chemical heat storage device, the object to be heated provided on the inner peripheral surface side of the reactor can be heated more efficiently and heat from the exhaust gas can be absorbed more efficiently. Can do.

  In one embodiment, a hole for conducting a reaction medium may be formed in the heat conduction surface of the high heat conduction member.

  In such a chemical heat storage device, the reaction medium can freely pass through the high heat conduction member through the hole formed in the heat conduction surface, so that the reaction medium easily enters the entire heat storage material. Thereby, the thermal storage material and the reaction medium can be efficiently chemically reacted.

  In one embodiment, the high thermal conductivity member may be a graphite sheet.

  In such a chemical heat storage device, a sheet-like high heat conduction member can be easily formed.

  In one embodiment, the heat storage material may further contain carbon fiber.

  In such a chemical heat storage device, the carbon fiber having higher thermal conductivity than the heat storage material is further contained in addition to the high heat conductive member, so that heat can be more efficiently conducted.

  According to the present invention, the thermal conductivity in the reactor can be improved.

It is a block diagram which shows the exhaust gas purification system provided with the chemical heat storage apparatus which concerns on one Embodiment. It is a perspective view which shows the molded object stored in the internal space of the reactor shown in FIG. It is the perspective view which expanded and showed a part of molded object shown in FIG. It is the perspective view which extracted and showed the graphite sheet from the molded object shown in FIG. It is drawing which showed the cross section seen from the axial direction of the exhaust pipe about the molded object which concerns on other embodiment. It is drawing which showed the cross section seen from the axial direction of the exhaust pipe about the molded object which concerns on other embodiment. It is drawing which showed the cross section seen from the axial direction of the exhaust pipe about the internal space of the reactor which concerns on other embodiment. It is a block diagram which shows the exhaust gas purification system provided with the chemical heat storage apparatus which concerns on other embodiment.

  Hereinafter, an exhaust gas purification system 1 including a chemical heat storage device 10 according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings do not necessarily match those described.

  FIG. 1 is a schematic configuration diagram illustrating an exhaust gas purification system 1 including a chemical heat storage device 10 according to an embodiment. An exhaust gas purification system 1 shown in FIG. 1 is provided in an exhaust system such as a diesel engine 2 (hereinafter simply referred to as “engine 2”) of a vehicle, and contains harmful substances contained in exhaust gas discharged from the engine 2 ( This system purifies environmental pollutants.

  An exhaust gas purification system 1 includes an oxidation catalyst (DOC) 4, a diesel exhaust particulate removal filter (DPF) 5, and a selective reduction catalyst that are provided in order from an upstream side to a downstream side in an exhaust passage 3 connected to an engine 2. (SCR) 6 and oxidation catalyst (ASC) 7 are provided.

The oxidation catalyst 4 is a catalyst that oxidizes and purifies HC, CO, etc. contained in the exhaust gas. The DPF 5 is a filter that collects and removes PM contained in the exhaust gas. The SCR 6 is a catalyst that supplies urea and NH ₃ (ammonia) from the addition valve 6a to reduce and purify NOx contained in the exhaust gas. The oxidation catalyst 7 is a catalyst that oxidizes ammonia flowing downstream of the SCR 6.

  The oxidation catalyst 4 has a temperature range (activation temperature) that exhibits the ability to purify environmental pollutants. Therefore, it is necessary to heat the oxidation catalyst 4 in order to set the temperature of the oxidation catalyst 4 to the activation temperature. Therefore, the exhaust gas purification system 1 includes a chemical heat storage device 10 that heats the oxidation catalyst 4. The chemical heat storage device 10 is a heating unit that heats the oxidation catalyst 4 (heating target) without energy. The chemical heat storage device 10 stores heat of exhaust gas (exhaust heat) and uses the heat stored when necessary.

The chemical heat storage device 10 includes a reactor 8 and a reservoir 11 that is connected to the reactor 8 via a connection pipe 9 and stores ammonia (NH ₃ ) as a reaction medium. The connecting pipe 9 is a part that connects the reactor 8 and the reservoir 11 and moves ammonia between the reactor 8 and the reservoir 11. The connection pipe 9 is provided with an on-off valve 9a.

  The reactor 8 is provided on the outer periphery of an exhaust pipe 13 that is a part of the exhaust passage 3. The exhaust pipe 13 is, for example, a cylindrical pipe, and is made of, for example, stainless steel. An oxidation catalyst 4 as a heating object is provided inside the exhaust pipe 13.

  FIG. 2 is a perspective view showing a molded body stored in the internal space of the reactor. As shown in FIG. 2, a plurality of molded bodies 20 are stored in the internal space of the reactor 8. The molded body 20 is formed in a curved cross section when viewed from the axial direction (exhaust direction) of the exhaust pipe 13. These molded bodies 20 are stored in the internal space of the reactor 8 in a state of being formed into an annular shape by combining a plurality of molded bodies 20. FIG. 3 is an enlarged perspective view of a part (hatched portion) of the molded body shown in FIG. As shown in FIG. 3, the plurality of molded bodies 20 are molded body parts in which a heat storage material 21 including a graphite sheet 23 is compression-molded.

As the heat storage material 21, a material having a composition of M _{a Xz} is used. M is one or more cations selected from alkali metals, alkaline earth metals, aluminum, transition metals, and combinations of these metals. X is one or more anions selected from fluoride ion, chloride ion, bromide ion, iodide ion, nitrate ion, thiocyanate ion, sulfate ion, molybdate ion, and phosphate ion. a is the number of cations per metal salt molecule. x is the number of anions per metal salt molecule. The heat storage material 21 can be formed of, for example, MgCl ₂ . The heat storage material 21 may be formed of CaCl ₂ , NiCl ₂ , MgI ₂ , CaI ₂ , MgBr ₂ or the like. An example of the thermal conductivity of the heat storage material 21 is 0.1 W / (m · K).

  The graphite sheet 23 is a sheet-like high heat conductive member having a higher thermal conductivity than the heat storage material 21. An example of the thickness of the graphite sheet 23 is 100 μm or less, and an example of the thermal conductivity is 300 to 1600 W / (m · K).

  As shown in FIGS. 3 and 4, the graphite sheet 23 is formed by bending the plurality of bent portions 23 b and 23 c so that the outer peripheral surface 8 a side of the reactor 8 to which the connecting pipe 9 is connected or the exhaust is connected. A plurality of heat conducting surfaces 23a are formed so as to be positioned on the inner peripheral surface 8b side of the reactor 8 in contact with the tube 13 and extend from the outer peripheral surface 8a side to the inner peripheral surface 8b side. In the present embodiment, the heat conducting surface 23a is configured as a surface extending in a direction approximately along the radial direction and the axial direction of the exhaust pipe 13. In the present embodiment, a plurality of heat conducting surfaces 23 a are formed along the circumferential direction of the exhaust pipe 13.

  Further, as shown in FIGS. 3 and 4, the graphite sheet 23 forms a flat surface 23 d substantially parallel to the outer peripheral surface 13 a of the exhaust pipe 13. The flat surface 23 d is provided adjacent to the bent portion 23 b located on the inner peripheral surface 8 b side of the reactor 8.

  The bent portions 23 b and 23 c and the flat surface 23 d in the graphite sheet 23 are exposed from the heat storage material 21. In other words, the bent portion 23 c of the graphite sheet 23 is in contact with the outer peripheral surface 8 a of the reactor 8, and the bent portion 23 b and the flat surface 23 d of the graphite sheet 23 are in contact with the inner peripheral surface 8 b of the reactor 8. Moreover, as shown in FIG. 4, the heat conductive surface 23a of the graphite sheet 23 is formed with a hole 23e for conducting ammonia. In the present embodiment, as shown in FIG. 4, the holes 23 e are arranged in a straight line along the circumferential direction of the exhaust pipe 13. However, the present invention is not limited to this.

  By appropriately adjusting the bending method of the graphite sheet 23 and the content of the graphite sheet 23 with respect to the heat storage material 21, it is possible to obtain the molded body 20 having a thermal conductivity that matches the heating object. Specifically, for example, the distance between the adjacent bent portions 23c of the graphite sheet 23 contained in the heat storage material 21 is adjusted, or the volume ratio of the graphite sheet 23 contained in the heat storage material 21 to the molded body 20 is set. By adjusting it, it can be set as the molded object 20 which has the thermal conductivity matched with the heating target object etc.

  The bent graphite sheet 23 in the molded body 20 is formed by compression molding in a state where the powder heat storage material 21 and the previously bent graphite sheet 23 are set in a mold. Alternatively, a graphite sheet 23 is placed in a mold filled with a predetermined amount of powdery heat storage material 21, and, for example, by pressing with a mold corresponding to the shape of the graphite sheet 23 shown in FIG. After forming into the shape shown in FIG. 3, you may form by filling the metal mold | die with the powder-like heat storage material 21, and compression-molding.

  Activated carbon is enclosed in the reservoir 11. The reservoir 11 stores ammonia by physically adsorbing the ammonia to the enclosed activated carbon. The reservoir 11 may be filled with, for example, a mesoporous material (mesoporous silica having mesopores, mesoporous carbon, mesoporous alumina, etc.), zeolite, silica gel, or the like.

When the exhaust gas purification system 1 is configured as described above, when the temperature of the exhaust gas from the engine 2 is low, such as immediately after the engine 2 is started (when the temperature of the exhaust gas is lower than the activation temperature of the catalyst), the on-off valve 9a Is opened, and ammonia is supplied from the reservoir 11 to the reactor 8 through the connecting pipe 9. Thereby, the heat storage material 21 (for example, MgCl ₂ ) and ammonia (NH ₃ ) formed as the formed body 20 chemically react and chemically adsorb (coordinate bond), and heat is generated from the heat storage material 21. That is, the reaction from the left side to the right side in the following reaction formula occurs. Then, the heat generated from the heat storage material 21 is transmitted to the oxidation catalyst 4 through the exhaust pipe 13, and the oxidation catalyst 4 is heated to an activation temperature suitable for purification of pollutants.
MgCl ₂ + _x NH ₃ Ｍｇ Mg (NH ₃ ) _x Cl ₂ + heat

  In the above embodiment, the heat storage material 21 including the graphite sheet 23 having a higher thermal conductivity than the heat storage material 21 is stored in the reactor 8 disposed around the exhaust pipe 13. The graphite sheet 23 forms a plurality of heat conducting surfaces 23a extending from the outer peripheral surface 8a side to the inner peripheral surface 8b side. For this reason, since the heat generated in the heat storage material 21 is transmitted to the oxidation catalyst 4 via the graphite sheet 23, the thermal conductivity in the reactor 8 is improved. As a result, during the exothermic reaction, the reaction heat generated in the heat storage material 21 is easily transmitted to the oxidation catalyst 4 that is the object to be heated, so that the oxidation catalyst 4 can be efficiently heated.

On the other hand, when the temperature of the exhaust gas from the engine 2 increases, the heat from the exhaust gas is applied to the heat storage material 21 (for example, MgCl ₂ ) formed as the molded body 20, and MgCl ₂ and NH ₃ are converted. To separate. That is, the reaction from the right side to the left side in the above reaction formula occurs. Then, NH ₃ separated from MgCl ₂ is absorbed by the reservoir 11 through the connecting pipe 9.

  Moreover, in the said embodiment, since the heat | fever from exhaust gas is transmitted through the graphite sheet 23 similarly to the time of exothermic reaction, the heat conductivity in the reactor 8 improves. As a result, heat from the exhaust gas is easily transferred to the heat storage material 21 during the regeneration reaction, so that ammonia can be efficiently separated from the heat storage material 21.

  Moreover, in the said embodiment, in the graphite sheet 23, the flat surface 23d substantially parallel to the outer peripheral surface 13a of the exhaust pipe 13 is formed adjacent to the bending part 23b located in the inner peripheral surface 8b side. For this reason, heat can be more efficiently transferred to the portion where the flat surface 23d is formed, that is, the portion where the oxidation catalyst 4 is provided, and heat from the exhaust gas can be absorbed more efficiently. Can do.

  In the above embodiment, the bent portions 23 b and 23 c of the graphite sheet 23 are exposed from the heat storage material 21. For this reason, heat can be more efficiently transmitted from the heat storage material 21 to the portion where the graphite sheet 23 is exposed, and heat from the portion where the heat storage material is exposed can be absorbed more efficiently. Can do.

  Moreover, in the said embodiment, the hole 23e for making ammonia conduct | electrically_connect is formed in the heat conductive surface 23a of the graphite sheet 23. FIG. For this reason, ammonia can freely pass through the graphite sheet 23 through the hole 23e formed in the heat conduction surface 23a. As a result, ammonia can easily enter the entire heat storage material 21, and the heat storage material 21 and ammonia can be efficiently chemically reacted.

  Although one embodiment has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

  In the above embodiment, in the graphite sheet 23, an example in which a flat surface 23d substantially parallel to the outer peripheral surface 13a of the exhaust pipe 13 is formed adjacent to the bent portion 23b located on the inner peripheral surface 8b side will be described. However, the present invention is not limited to this. FIG. 5 is a cross-sectional view of the molded body 120 disposed in the internal space of the reactor 8 as viewed from the axial direction of the exhaust pipe 13. As shown in FIG. 5, without providing a flat surface 23d (see FIG. 3 or 4) on the inner peripheral surface 8b side or the outer peripheral surface 8a of the reactor 8, the graphite sheet 23 viewed from the axial direction of the exhaust pipe 13 You may comprise so that a cross section may become what is called a bellows shape.

  Moreover, in the said embodiment, although the bending part 23b located in the inner peripheral surface 8b side of the reactor 8 and the flat surface 23d were mentioned and demonstrated in the graphite sheet 23, the example was exposed from the heat storage material 21, but this invention was demonstrated. Is not limited to this. The bent portion 23b and the flat surface 23d may be arranged so as not to be exposed on the inner peripheral surface 8b side of the heat storage material 21, or only the bent portion 23b is exposed, and the flat surface 23d is in the heat storage material 21. It may be arranged. Similarly, the bent portion 23 c arranged on the outer peripheral surface 8 a side of the reactor 8 may be arranged so as not to be exposed on the outer peripheral surface 8 a side of the heat storage material 21.

  FIG. 6 is a cross-sectional view of the molded body 220 disposed in the internal space of the reactor 8 as viewed from the axial direction of the exhaust pipe 13. As shown in FIG. 6, the heat storage material 21 may contain a graphite sheet 23 having a higher thermal conductivity than the heat storage material 21 and a carbon fiber 25 having a higher thermal conductivity than the heat storage material 21. That is, a molded body 220 in which the heat storage material 21, the graphite sheet 23, and the carbon fiber 25 are compression-molded may be disposed in the internal space of the reactor 8. In such a molded body 220, since the carbon fiber 25 having higher thermal conductivity than the heat storage material 21 is contained in addition to the graphite sheet 23, heat can be more efficiently conducted. Note that holes 23e as shown in FIG. 4 may be formed in the graphite sheet 23. In this case, the heat of the heat storage material 21 can be more efficiently conducted by the carbon fiber 25 entering the hole 23e.

  Moreover, in the said embodiment, although the molded object 20,120,220 gave and demonstrated the example (it was formed in the cross-sectional curve shape seeing from the axial direction of the exhaust pipe 13), it demonstrated, The present invention is not limited to this, and may be formed in, for example, a rectangular parallelepiped, a cube, or a hollow cylindrical shape.

  Moreover, in the said embodiment, the molded object 20 in which the thermal storage material 21 and the graphite sheet 23 were compression-molded, or the molded object 220 in which the thermal storage material 21, the graphite sheet 23, and the carbon fiber 25 were compression-molded are reactors. Although the example stored in the internal space 8 has been described, the present invention is not limited to this. FIG. 7 is a cross-sectional view of the internal space of the reactor 8 as viewed from the axial direction of the exhaust pipe 13. For example, as shown in FIG. 7, a graphite sheet 23 bent into the shape shown in FIG. 7 is installed in a predetermined space 27 formed in the reactor 8, and thereafter, a powder heat storage material 21 is filled. Also good. Thus, even if it is a case where it is not the structure as a molded object, the effect similar to the said embodiment can be acquired. In addition, here, an example in which the bent portion 23c arranged on the outer peripheral surface 8a side is not exposed from the heat storage material 21 has been described, but the bent portion 23c may be exposed from the heat storage material 21. The shape of the graphite sheet 23 disposed on the heat storage material 21 can be various shapes as described above.

  In the said embodiment, although the example which employ | adopted the graphite sheet 23 as a sheet-like high heat conductive member contained in the thermal storage material 21 was given and demonstrated, this invention is not limited to this, For example, the thermal storage material 21 It may be a sheet-like member made of SUS, aluminum, copper or the like having a higher thermal conductivity. In addition, it is preferable that the sheet-like high heat conductive member contained in the heat storage material 21 is a material that is not corroded by the reaction medium.

  Moreover, in the said embodiment, as shown in FIG.3 and FIG.4, while the heat conductive surface 23a is comprised as a surface extended in the direction which follows the radial direction and axial direction of the exhaust pipe 13, Although a plurality of configurations formed along the circumferential direction has been described as an example, the present invention is not limited to this. For example, the heat conduction surface 23 a is configured as a surface extending in a direction approximately along the radial direction and the circumferential direction of the exhaust pipe 13, and a plurality of the heat conduction surfaces 23 a are formed along the axial direction of the exhaust pipe 13. It may be a configuration.

  In the above-described embodiment, the example in which the plurality of molded bodies 20 are arranged along the axial direction of the exhaust pipe 13 and the circumferential direction of the exhaust pipe 13 has been described. However, these numbers can be set as appropriate. .

In the above-described embodiment, an example in which heat is generated by chemically reacting ammonia as a reaction medium and MgCl _{2 as the} heat storage material 21 has been described. However, as the reaction medium, ammonia (NH ₃ ) is particularly used. For example, H ₂ O may be used. In this case, CaO or the like can be used as a heat storage material that chemically reacts with H ₂ O.

  Moreover, although the said embodiment gave and demonstrated the example which uses the oxidation catalyst 4 provided in the exhaust system of the engine 2 as a heating target object, this invention is not limited to this, For example, a selective reduction catalyst (SCR) 6 may be the heating object, and the exhaust pipe 13 may be the heating object. Further, in the present invention, as shown in FIG. 8, a heat exchanger 14 made of a member having high thermal conductivity such as a metal honeycomb structure is disposed in an exhaust pipe upstream of a catalyst such as an oxidation catalyst (DOC) 4. The present invention is also applicable to the exhaust gas purification system 1A. In this case, the heat exchanger 14 may be a heating target, the reactor 12 may be disposed on the outer peripheral portion of the heat exchanger 14, and the heat exchanger 14 may be heated from the outer peripheral side. In the above embodiment, the example applied to the exhaust system of the diesel engine 2 has been described. However, the present invention is not limited to this example, and is applied to the exhaust system of a gasoline engine. May be used as an object to be heated, and other than the internal combustion engine may be used as an object to be heated.

  DESCRIPTION OF SYMBOLS 1,1A ... Exhaust gas purification system, 2 ... Diesel engine, 3 ... Exhaust passage, 4 ... Oxidation catalyst (object to be heated), 6a ... Addition valve, 7 ... Oxidation catalyst, 8, 12 ... Reactor, 8a ... Outer peripheral surface, 8b ... inner peripheral surface, 9 ... connecting pipe, 9a ... open / close valve, 10 ... chemical heat storage device, 11 ... reservoir, 13 ... exhaust pipe, 13a ... outer peripheral surface, 14 ... heat exchanger, 20, 120, 220 ... molding Body, 21 ... heat storage material, 23 ... graphite sheet (high heat conduction member), 23a ... heat conduction surface, 23b, 23c ... bent portion, 23d ... flat surface, 23e ... hole, 25 ... carbon fiber, 27 ... space.

Claims (7)

In a chemical heat storage device for heating a heating object provided inside an exhaust pipe that forms an exhaust system of an engine,
A reactor that is disposed around the exhaust pipe and stores a heat storage material that chemically reacts with the reaction medium to generate heat;
A reservoir for storing the reaction medium;
A connecting pipe for connecting the reactor and the reservoir and moving a reaction medium between the reactor and the reservoir;
The heat storage material includes a sheet-like high heat conduction member having a higher thermal conductivity than the heat storage material,
Each of the plurality of bent portions formed by bending the high thermal conductivity member is on the outer peripheral surface side of the reactor to which the connecting pipe is connected or on the inner peripheral surface side of the reactor in contact with the exhaust pipe. And a plurality of heat conductive surfaces extending from the outer peripheral surface side to the inner peripheral surface side, and forming a flat surface substantially parallel to the outer peripheral surface of the exhaust pipe, Chemical heat storage device. The chemical heat storage device according to claim 1 , wherein the flat surface is provided adjacent to the bent portion located on the inner peripheral surface side. The bent portion of the high thermal conductivity member is exposed from the heat storage material, the chemical heat storage device according to claim 1 or 2. The chemical heat storage device according to claim 3 , wherein the bent portion located on the inner peripheral surface side of the bent portion of the high heat conductive member is exposed from the heat storage material. The chemical heat storage device according to any one of claims 1 to 4 , wherein a hole for conducting the reaction medium is formed in the heat conducting surface of the high heat conducting member. The chemical heat storage device according to any one of claims 1 to 5 , wherein the high thermal conductive member is a graphite sheet. The chemical heat storage device according to any one of claims 1 to 6 , wherein the heat storage material further contains carbon fiber.

Images