Heat storage system

Abstract

To provide a heat storage system having an excellent heat storage efficiency and heat dissipation efficiency.SOLUTION: A heat storage system includes a honeycomb structure having an outer peripheral wall 11 and a partitioning wall 14 provided on an inner side of the outer peripheral wall 11 and for partitioning and forming a plurality of cells 13 extending from a first end face 12a to a second end face 12b. At least a part of the cells 13 of the honeycomb structure includes: one or more heat storage parts 10 in which a chemical heat storage material 15 is held which can store heat by heating reaction and dissipate heat by reaction with a reactive medium R; a case part 20 which stores the heat storage part 10; a heat transmission part 30 which allows a heat transfer medium to flow inside and can heat the heat transfer medium by the heat dissipated by the heat storage part 10; a storage tank 40 which can supply the reactive medium R to the case part 20 and collect the reactive medium R from the case part 20; a heating mechanism 50 which heats the heat storage part 10 and / or a heat gas supply structure 100; and a flow structure 60 which is connected to the heat transmission part 30 and can heat a heating object part 90 by transferring the heat transfer medium heated by the heat transmission part 30 to the heating object part 90.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heat storage system.

Background Art

[0002] Heat is generated inside a vehicle, and the generated heat may be utilized as thermal energy. For example, the heat generated by an internal combustion engine may be used for heating the vehicle interior. Also, from the viewpoint of energy conservation, technologies for utilizing the thermal energy inside a vehicle for some applications have been developed. On the other hand, an electric vehicle does not have an internal combustion engine and is powered by a secondary battery for driving the electric vehicle. For this reason, the amount of exhaust heat of an electric vehicle is extremely small compared to that of a conventional vehicle. Therefore, there is a demand for a system that can efficiently store heat by heating with external power supply such as during charging while suppressing the usage amount of the battery during driving as much as possible.

[0003] As a system for utilizing thermal energy, for example, there is a heat exchanger. A heat exchanger is a device that performs heat exchange between a first fluid and a second fluid by circulating the first fluid inside and the second fluid outside. In such a heat exchanger, heat can be effectively utilized by performing heat exchange from a high-temperature fluid (for example, exhaust gas, etc.) to a low-temperature fluid (for example, cooling water, etc.).

[0004] As a heat exchanger for recovering heat from a high-temperature fluid such as automotive exhaust gas, Patent Document 1 proposes a heat exchanger (waste heat recovery device) that includes a hollow honeycomb structure and a casing that houses the hollow honeycomb structure. The casing has a cylindrical member arranged to fit around the outer peripheral surface of the hollow honeycomb structure, and a casing body that forms a path for the heat exchange medium outside the cylindrical member. The exhaust gas path flowing into the hollow honeycomb structure has a branch path that branches into the hollow portion and cells of the hollow honeycomb structure, and by changing the ventilation resistance of the exhaust gas path in the hollow portion of the hollow honeycomb structure, the flow rate of the exhaust gas flowing through the cells of the hollow honeycomb structure is controlled. With a heat exchanger having such a structure, miniaturization can be achieved, and the pressure loss can be reduced while increasing the heat recovery amount.

[0005] However, the heat exchanger described in Patent Document 1 performs heat recovery from the exhaust gas and heat transfer to the heat exchange medium of the recovered heat at approximately the same timing, and the timing when the recovered heat can be effectively utilized is limited. For example, when heat is not being recovered from the exhaust gas, heat transfer (i.e., heat exchange) to the heat exchange medium cannot be performed. Also, when heat recovery from the exhaust gas and heat transfer of the recovered heat to the heat exchange medium are performed at approximately the same timing, the heat that cannot be recovered becomes waste heat as it is. In addition, in the heat exchanger described in Patent Document 1, it has been proposed to provide a heat insulating layer composed of a heat storage material or the like outside the path of the heat exchange medium, but this heat insulating layer is intended to suppress heat dissipation from the heat exchange medium and does not expand the timing when the recovered heat can be effectively utilized.

[0006] In the case of others, Patent Document 2 describes a porous honeycomb heat storage structure that recovers and stores the exhaust heat of an automobile using a heat storage material and uses the stored heat for activating a catalyst (exhaust gas treatment catalyst) at the time of the next engine start. This porous honeycomb heat storage structure includes a honeycomb structure body that partitions and forms a plurality of cells extending from one end face to the other end face and has a porous partition wall through which a reaction medium can flow inside, and a heat storage material that stores and releases heat by a reversible chemical reaction or physical adsorption / desorption with the reaction medium is filled in at least a part of the cells, and a formed heat storage part, and the area ratio of the heat storage part to the cross-sectional area of the honeycomb cross section orthogonal to the axial direction of the honeycomb structure body occupies a range of 60 to 90%. Since the reaction medium can flow inside the cells and the porous partition wall, the contact between the heat storage part (heat storage material) and the reaction medium is quickly performed, and the responsiveness of the heat release process is good.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in the heat storage system using the porous honeycomb heat storage structure described in Patent Document 2, the means for adding heat from the outside to the heat storage part and the means for transferring heat from the heat storage part to the outside have not been examined in detail. Therefore, when these means are not appropriate, the heat storage efficiency and the heat release efficiency may not be sufficiently ensured. In addition, although the problems of heat storage efficiency and heat release efficiency in vehicles such as automobiles have been described above, the same problems also exist in fields other than vehicles (for example, industrial furnaces and agriculture).

[0009] The present invention has been made to solve the above-described problems, and an object thereof is to provide a heat storage system excellent in heat storage efficiency and heat dissipation efficiency.

Means for Solving the Problems

[0010] As a result of intensive research on the heat storage system, the inventors of the present invention have found that the above problems can be solved by adopting a specific structure, and have completed the present invention. That is, the present invention is exemplified as follows.

[0011] [1] A honeycomb structure body having an outer peripheral wall and partition walls disposed inside the outer peripheral wall and partitioning and forming a plurality of cells extending from a first end face to a second end face, and at least a part of the cells of the honeycomb structure body One or more heat storage parts in which a chemical heat storage material capable of storing heat by a heating reaction and dissipating heat by a reaction with a reaction medium are held, A case part for housing the heat storage part, A heat transfer part through which a heat transfer medium flows inside and can heat the heat transfer medium by the heat dissipated in the heat storage part, A storage tank capable of supplying the reaction medium to the case part and recovering the reaction medium from the case part, A heating mechanism and / or a heating gas supply structure capable of heating the heat storage part, A flow path structure connected to the heat transfer part and capable of transporting the heat transfer medium heated in the heat transfer part to a heating target part to heat the heating target part A heat storage system comprising:

[0012] [2] The heat storage system according to [1], wherein the case part is in direct or indirect contact with the outer peripheral wall of the honeycomb structure body.

[0013] [3] The heat storage system according to [1] or [2], wherein the heat transfer part has a jacket part disposed at intervals so as to form a flow path of the heat transfer medium on the outer peripheral side of the case part parallel to the direction in which the cells of the honeycomb structure body extend.

[0014] [4] The heat transfer part is provided in the central region of the honeycomb structure parallel to the direction in which the cells of the honeycomb structure extend, for the heat storage system according to [1] or [2].

[0015] [5] The heat storage system according to [4], wherein the heat transfer part has a honeycomb structure.

[0016] [6] The heat storage system according to any one of [1] to [3], wherein the heating mechanism has at least one heater or a pair of electrodes that contact at least a part of the honeycomb structure.

[0017] [7] The heating gas supply structure has a heating gas supply port provided in the case part, The heat storage system according to any one of [1] to [3] and [6], wherein the heating gas supply port is connected to a pipe through which the heating gas flows.

[0018] [8] The heat storage system according to [7], wherein the heating gas is heated by an internal combustion engine and / or a heater.

[0019] [9] The case part and the storage tank are connected by at least one pipe, The heat storage system according to any one of [1] to [8], wherein a decompression mechanism is provided to decompress the case part side when supplying the reaction medium from the storage tank to the case part.

[0020]

[10] The heat storage system according to any one of [1] to [9], wherein the reaction medium supplied to the case part is in a liquid state.

[0021]

[11] The heat storage system according to any one of [1] to [9], wherein the reaction medium supplied to the case part is in a gaseous state, and a heater for vaporizing the reaction medium is provided in the storage tank.

[0022]

[12] The heat storage system according to any one of [1] to

[11] , wherein the chemical heat storage material is filled in the cell.

[0023]

[13] The heat storage system according to any one of [1] to

[12] , wherein porous plugging portions are provided on the first end face side and the second end face side of the cell filled with the chemical heat storage material.

[0024]

[14] The heat storage system according to any one of [1] to

[13] , wherein the ratio of the cells in which the chemical heat storage material is held in all the cells of the honeycomb structure is 10% or more.

[0025]

[15] The heat storage system according to any one of [1] to

[14] , wherein the reaction medium is at least one selected from water, ammonia, alcohol, and carbon dioxide.

[0026]

[16] The heat storage system according to any one of [1] to

[15] , wherein the partition wall is porous.

[0027]

[17] The heat storage system according to any one of [1] to

[16] , which is for vehicle-mounted use.

[0028]

[18] The heat storage system according to

[17] , wherein the chemical heat storage material is at least one selected from hydroxides of alkali metals and hydroxides of alkaline earth metals.

[0029]

[19] The heat storage system according to

[17] or

[18] , wherein heat storage in the heat storage part is performed during charging or running of the vehicle.

[0030]

[20] The heat storage system according to any one of

[17] to

[19] , wherein heat dissipation in the heat storage part is performed during warm-up operation or start of running of the vehicle.

[0031]

[21] The heat storage system according to any one of

[17] to

[20] , wherein the part to be heated is a battery.

[0032]

[22] The heat storage system according to any one of [1] to

[16] , wherein the object to be heated is an industrial furnace.

[0033]

[23] The heat storage system according to any one of [1] to

[16] , wherein the object to be heated is a greenhouse.

Advantages of the Invention

[0034] According to the present invention, a heat storage system excellent in heat storage efficiency and heat dissipation efficiency can be provided.

Brief Description of the Drawings

[0035]

Figure 1

Figure 2A

Figure 2B

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10A

Figure 10B

Figure 11

Embodiments for Carrying Out the Invention

[0036] The present invention includes a honeycomb structure having an outer peripheral wall and a partition wall disposed inside the outer peripheral wall and partitioning a plurality of cells extending from a first end face to a second end face, and at least a part of the cells of the honeycomb structure contains one or more heat storage parts in which a chemical heat storage material capable of storing heat by a heating reaction and dissipating heat by reacting with a reaction medium is held; a case part for housing the heat storage part; a heat transfer part through which a heat transfer medium flows and can be heated by the heat dissipated in the heat storage part; a storage tank capable of supplying a reaction medium to the case part and recovering the reaction medium from the case part; a heating mechanism and / or a heating gas supply structure capable of heating the heat storage part; and a flow path structure connected to the heat transfer part and capable of transporting the heat transfer medium heated in the heat transfer part to a heating target part to heat the heating target part. The heat storage system having such a configuration can be efficiently heated by a heating mechanism and / or a heating gas supply structure capable of heating the heat storage part, so it has excellent heat storage efficiency. Further, this heat storage system can efficiently transport the heat transfer medium to the heating target part by the flow path structure connected to the heat transfer part, so it also has excellent heat dissipation efficiency.

[0037] Hereinafter, embodiments of the heat storage system of the present invention will be specifically described with reference to the drawings. The present invention is not limited to the following embodiments, and it should be understood that modifications and improvements can be appropriately added to the following embodiments based on the ordinary knowledge of those skilled in the art without departing from the gist of the present invention, and such modified and improved embodiments also fall within the scope of the present invention.

[0038] (Embodiment 1) FIG. 1 is an overall schematic configuration diagram of the heat storage system according to Embodiment 1 of the present invention. As shown in FIG. 1, the heat storage system according to Embodiment 1 of the present invention includes a heat storage unit 10, a case unit 20, a heat transfer unit 30, a storage tank 40, a heating mechanism 50, and a flow path structure 60.

[0039] Cross-sectional views of the heat storage unit 10 are shown in FIGS. 2A and 2B. FIG. 2A is a cross-sectional view parallel to the direction in which the cells 13 of the heat storage unit 10 extend, and FIG. 2B is a cross-sectional view taken along line a-a' of FIG. 2A. As shown in FIGS. 2A and 2B, the heat storage unit 10 includes a honeycomb structure having an outer peripheral wall 11 and a partition wall 14 disposed inside the outer peripheral wall 11 and partitioning and forming a plurality of cells 13 extending from a first end face 12a to a second end face 12b. A chemical heat storage material 15 capable of storing heat by a heating reaction and radiating heat by reacting with a reaction medium R is held in at least a part of the cells 13 of the honeycomb structure. In FIG. 1, an example is shown in which one heat storage unit 10 housed in the case unit 20 is used, but two or more heat storage units 10 housed in the case unit 20 may be provided. For example, as shown in FIG. 3, by adjusting the shapes of the case unit 20 and the heat transfer unit 30, two or more (three in FIG. 2) heat storage units 10 can be housed in the case unit 20. Here, FIG. 3 is a modified example of a part composed of the heat storage unit 10, the case unit 20, and the heat transfer unit 30 in FIG. 1.

[0040] The shape (outer shape) of the honeycomb structure constituting the heat storage unit 10 is not particularly limited and can be various shapes. Examples of the shape (outer shape) of the honeycomb structure include a cylinder, an elliptical cylinder, a quadrangular prism, or other polygonal prisms.

[0041] The partition wall 14 is not particularly limited, but as shown in FIG. 4 in a cross-section perpendicular to the direction in which the cells 13 extend, it can have a first partition wall 14a extending in the radial direction and a second partition wall 14b extending in the circumferential direction. Heat from the chemical heat storage material 15 held in the cells 13 can be efficiently transmitted to the outer peripheral wall 11. Note that FIG. 4 is a cross-section perpendicular to the direction in which the cells 13 extend.

[0042] The thickness of the outer peripheral wall 11 is preferably greater than the thickness of the partition wall 14. By adopting such a configuration, the strength of the outer peripheral wall 11, which is likely to be damaged (e.g., cracked, fissured, etc.) due to external impact, thermal stress, etc., can be enhanced. The thickness of the outer peripheral wall 11 is preferably more than 0.3 mm and not more than 10 mm, more preferably 0.5 mm to 5 mm, and still more preferably 1 mm to 3 mm. The thickness of the partition wall 14 is preferably 0.1 mm to 1 mm, and more preferably 0.2 mm to 0.6 mm. By setting the thickness of the partition wall 14 to be 0.1 mm or more, the mechanical strength of the honeycomb structure can be made sufficient. Also, by setting the thickness of the partition wall 14 to be 1 mm or less, it is possible to suppress a decrease in the holding amount of the chemical heat storage material 15 due to a decrease in the opening area.

[0043] The partition wall 14 is preferably porous. By making the partition wall 14 porous, when the chemical heat storage material 15 held in the cell 13 reacts with the reaction medium R, the reaction medium R flows through the inside of the partition wall 14, so that the contact between the chemical heat storage material 15 and the reaction medium R proceeds promptly, and an exothermic reaction can be carried out rapidly. Note that the outer peripheral wall 11 may also be porous in the same manner as the partition wall 14. Here, in this specification, "porous" means having open pores and a porosity of 1% or more. The porosity can be, for example, 5% or more, 10% or more, 15% or more, or 20% or more, but is preferably 10 to 30%. Note that in this specification, "porosity" means the porosity measured by the mercury intrusion method in accordance with JIS R1655:2003.

[0044] The materials of the outer peripheral wall 11 and the partition wall 14 are not particularly limited, but it is preferable that ceramics be the main component. Here, in this specification, "having ceramics as the main component" means that the mass ratio of ceramics in the total mass is 50% by mass or more.

[0045] The outer peripheral wall 11 and the partition wall 14 preferably contain SiC (silicon carbide) having high thermal conductivity as a main component. Since SiC is also excellent in high-temperature resistance and chemical resistance, it becomes possible to use various types of chemical heat storage materials 15, reaction medium R, and the like. Here, in this specification, "containing SiC (silicon carbide) as a main component" means that the mass ratio of SiC (silicon carbide) in the total mass is 50% by mass or more.

[0046] More specifically, as materials for the outer peripheral wall 11 and the partition wall 14, Si-impregnated SiC, (Si + Al)-impregnated SiC, metal composite SiC, recrystallized SiC, Si 3 N 4 , and SiC, etc. can be used. Among them, it is preferable to use Si-impregnated SiC and (Si + Al)-impregnated SiC because of their high thermal conductivity.

[0047] The cell density (that is, the number of cells 13 per unit area) in the cross-section of the honeycomb structure perpendicular to the direction in which the cell 13 extends is not particularly limited and can be adjusted as appropriate, but it is preferably in the range of 4 to 320 cells / cm 2 . By setting the cell density to 4 cells / cm 2 or more, it is possible to sufficiently ensure the strength of the partition wall 14, and thus the strength of the honeycomb structure itself and the effective GSA (geometric surface area). Also, by setting the cell density to 320 cells / cm 2 or less, an increase in the pressure loss when the first fluid flows can be suppressed.

[0048] The isostatic strength of the honeycomb structure is not particularly limited, but it is preferably more than 100 MPa, more preferably 150 MPa or more, and still more preferably 200 MPa or more. When the isostatic strength of the honeycomb structure exceeds 100 MPa, the honeycomb structure becomes excellent in durability. The isostatic strength of the honeycomb structure can be measured according to the measurement method of the isostatic fracture strength specified in the JASO standard M505 - 87, which is an automotive standard issued by the Japan Society of Automotive Engineers.

[0049] The diameter (outer diameter) of the outer peripheral wall 11 in a cross section perpendicular to the direction in which the cell 13 extends is not particularly limited, but is preferably 20 to 200 mm, and more preferably 30 to 100 mm. By setting the diameter in such a manner, the heat storage efficiency can be improved. When the outer peripheral wall 11 is not circular, the diameter of the maximum circle inscribed in the cross-sectional shape of the outer peripheral wall 11 is defined as the diameter of the outer peripheral wall 11.

[0050] The thermal conductivity of the honeycomb structure is not particularly limited, but at 25°C, it is preferably 10 W / (m·K) or more, more preferably 100 to 300 W / (m·K), and still more preferably 120 to 300 W / (m·K). By setting the thermal conductivity of the honeycomb structure within such a range, the thermal conductivity becomes good, and the heat stored in the heat storage part 10 can be efficiently transferred to the outside. Note that the value of the thermal conductivity is a value measured by the laser flash method (JIS R1611:1997).

[0051] A chemical heat storage material 15 is held in a part of the cells 13 of the honeycomb structure. As a method for holding the chemical heat storage material 15 in the cell 13, it is not particularly limited, and various methods can be used. For example, the chemical heat storage material 15 may be applied and fixed to the partition wall 14 that forms the cell 13, or as shown in FIGS. 2A and 2B, the cell 13 may be filled with the chemical heat storage material 15. When the chemical heat storage material 15 is applied and fixed to the partition wall 14, it is only necessary that a layer of the chemical heat storage material 15 is formed on the surface of the partition wall 14, and there may be a portion where the chemical heat storage material 15 does not exist in the central region of the cell 13. However, it is preferable that the chemical heat storage material 15 is filled in the cell 13. By filling the cell 13 with the chemical heat storage material 15, the holding amount of the chemical heat storage material 15 increases, so that the heat storage amount and the heat release amount can be increased.

[0052] In the honeycomb structure, the position of the cell 13 that holds the chemical heat storage material 15 is not particularly limited. For example, in a cross-section perpendicular to the direction in which the cell 13 extends, as shown in FIGS. 2A and 2B, the chemical heat storage material 15 can be evenly held in all the cells 13 of the honeycomb structure. Also, in a cross-section perpendicular to the direction in which the cell 13 extends, the chemical heat storage material 15 may be held approximately evenly on the central side and the outer peripheral side of the honeycomb structure (upper diagram in FIG. 4), or the chemical heat storage material 15 may be held mainly on the outer peripheral side of the honeycomb structure (middle diagram in FIG. 4), or the chemical heat storage material 15 may be held mainly on the central side of the honeycomb structure (lower diagram in FIG. 4).

[0053] It is preferable that the cell 13 filled with the chemical heat storage material 15 is provided with porous plugging portions 16 on the first end face 12a side and the second end face 12b side. By adopting such a configuration, it is possible to prevent the chemical heat storage material 15 from falling out of the cell 13. The material of the plugging portion 16 is not particularly limited, and the same material as that of the outer peripheral wall 11 and the partition wall 14 can be used. Also, the plugging portion 16 may be formed using a resin sheet or the like. The method for forming the plugging portion 16 is not particularly limited and can be carried out according to a known method.

[0054] The ratio of the cells 13 in which the chemical heat storage material 15 is held in all the cells 13 of the honeycomb structure is not particularly limited, but the higher the ratio, the greater the heat storage amount and the heat release amount. The ratio is preferably 10% or more, more preferably 30% or more, still more preferably 50% or more, and particularly preferably 80% or more. However, if the ratio is too high, it becomes difficult for the reaction medium R to come into contact with the chemical heat storage material 15. Therefore, the ratio is preferably 90% or less.

[0055] The chemical heat storage material 15 is not particularly limited, and those known in the technical field can be used. For the chemical heat storage material 15, it is preferable to use, for example, one having a heat storage density of 200 kJ / kg or more. Examples of the chemical heat storage material 15 include hydroxides of alkali metals such as NaOH and LiOH; Ca(OH) 2 、Mg(OH)2 Hydroxides of alkaline earth metals such as; MgCl 2 ·2NH 3 、CaCl 2 ·4NH 3 Ammonia complexes such as, MgCO 3 、CaCO 3 Carbonates such as etc. may be mentioned. These are selected according to the type of the reaction medium R and can be used alone or in combination of two or more. For example, hydroxides of alkali metals and hydroxides of alkaline earth metals are used when the reaction medium R is water. Ammonia complexes are used when the reaction medium R is ammonia. Carbonates are used when the reaction medium R is carbon dioxide. In particular, when the heat storage system is for vehicle use, since it is preferable that the reaction medium R is water, the chemical heat storage material 15 is preferably at least one selected from hydroxides of alkali metals and hydroxides of alkaline earth metals.

[0056] The shape of the chemical heat storage material 15 filled in the cell 13 is not particularly limited and can be various shapes such as powdery, granular, rod-shaped, etc. Further, when the chemical heat storage material 15 is applied and fixed to the partition wall 14 partitioning the cell 13, a coating composition containing the chemical heat storage material 15 and a binder may be used.

[0057] The heat storage unit 10 can be manufactured according to a method known in the art. For example, the heat storage unit 10 can be manufactured according to the method described below. First, the green body containing ceramic powder is extruded into a desired shape to produce a honeycomb formed body. At this time, by selecting an appropriate die and jig, the shape and density of the cells 13, the shape and thickness of the outer peripheral wall 11 and the partition wall 14, etc. can be controlled. Further, as the material of the honeycomb formed body, the above-described ceramics can be used. For example, when manufacturing a honeycomb formed body mainly composed of an Si-impregnated SiC composite material, a binder, water and / or an organic solvent are added to a predetermined amount of SiC powder, and the obtained mixture is kneaded to form a green body, which is then molded to obtain a honeycomb formed body of a desired shape. Then, the obtained honeycomb formed body is dried, and a honeycomb structure having cells 13 partitioned by the partition wall 14 is obtained by impregnating and firing the honeycomb formed body with metallic Si in a reduced-pressure inert gas or in a vacuum. Examples of the method of impregnating and firing with metallic Si include a method in which a lump containing metallic Si and the honeycomb formed body are arranged in contact with each other and fired. Next, a chemical heat storage material 15 is held in some of the cells 13 of the honeycomb structure. As the holding method, the method described above can be used. Further, when filling the chemical heat storage material 15 in some of the cells 13 of the honeycomb structure, a plugging portion 16 may be formed at one end of the cell 13 to be filled with the chemical heat storage material 15, and then the chemical heat storage material 15 may be filled from the other end, and a plugging portion 16 may be formed at the other end.

[0058] The case portion 20 is a member that houses the heat storage portion 10. Therefore, the case portion 20 is not particularly limited as long as it has a structure capable of housing the heat storage portion 10. For example, the shape of the case portion 20 may be appropriately selected according to the shape of the heat storage portion 10 to be housed, and can be various shapes such as a cylindrical shape and a rectangular tube shape. In FIG. 1, the case portion 20 is shown as one member, but the case portion 20 may be composed of two or more members. For example, the case portion 20 may be configured by combining a main body portion and a lid portion.

[0059] The case part 20 has a communication port 21 through which the reaction medium R can be supplied from the storage tank 40 and recovered to the storage tank 40. The number of the communication ports 21 may be one as shown in FIG. 1, or may be two. The communication port 21 is preferably provided so as to face the first end face 12a or 12b of the honeycomb structure constituting the heat storage part 10. By providing the communication port 21 at such a position, the supply and recovery of the reaction medium R become easier.

[0060] The case part 20 preferably contacts directly or indirectly with the outer peripheral wall 11 of the honeycomb structure constituting the heat storage part 10. By adopting such a configuration, the heat released from the heat storage part 10 can be easily transmitted to the heat transfer medium through the case part 20, so that the heating target part 90 can be efficiently heated.

[0061] The case part 20 preferably fits on the surface of the outer peripheral wall 11 of the honeycomb structure constituting the heat storage part 10. Here, in this specification, "fitting" means that the honeycomb structure and the target member (case part 20) are fixed in a state where they are fitted to each other. Therefore, in the fitting between the honeycomb structure and the case part 20, in addition to the fixing methods by fitting such as clearance fit, interference fit, and shrink fit, cases where the honeycomb structure and the case part 20 are fixed to each other by brazing, welding, diffusion bonding, etc. are also included.

[0062] The material of the case part 20 is not particularly limited, but is preferably a metal from the viewpoint of manufacturability. Further, when the case part 20 is made of metal, it is also excellent in that welding with other members can be easily performed. As the material of the case part 20, for example, stainless steel, titanium alloy, copper alloy, aluminum alloy, brass, etc. can be used. Among them, stainless steel is preferable because of its high durability and reliability and low cost.

[0063] The thickness of the case part 20 is not particularly limited, but is preferably 0.1 mm or more, more preferably 0.3 mm or more, and still more preferably 0.5 mm or more. By setting the thickness of the case part 20 to 0.1 mm or more, reliable durability can be ensured. Further, the thickness of the case part 20 is preferably 10 mm or less, more preferably 5 mm or less, and still more preferably 3 mm or less. By setting the thickness of the case part 20 to 10 mm or less, the thermal resistance can be reduced and the thermal conductivity can be increased.

[0064] The heat transfer part 30 is a member in which a heat transfer medium flows inside and the heat transfer medium can be heated by the heat radiated from the heat storage part 10. As the heat transfer part 30, it can have a jacket part arranged at intervals so as to form a flow path for the heat transfer medium on the outer peripheral side of the case part 20 parallel to the direction in which the cells 13 of the honeycomb structure extend. By using a jacket part having such a structure, the above functions can be easily obtained.

[0065] The heat transfer part 30 has a supply port 31 through which the heat transfer medium can be supplied to the inside and a discharge port 32 through which the heat transfer medium can be discharged to the outside. By providing such a supply port 31 and a discharge port 32, the heat transfer medium can be circulated inside the heat transfer part 30. The positions of the supply port 31 and the discharge port 32 are not particularly limited, but from the viewpoint of heat exchange performance, it is preferable to provide them on both end faces (the first end face 12a and the second end face 12b) of the honeycomb structure, respectively.

[0066] The heat transfer part 30 is preferably fixed to both ends of the case part 20 parallel to the direction in which the cells 13 of the honeycomb structure extend. The fixing method is not particularly limited, but in addition to fixing methods by fitting such as clearance fitting, interference fitting, and shrink fitting, brazing, welding, diffusion bonding, etc. can be used.

[0067] The shape of the heat transfer part 30 is not particularly limited and can be various cylindrical shapes such as a cylindrical shape and a rectangular tube shape. The material of the heat transfer part 30 is not particularly limited, and the same material as that of the case part 20 can be used. Also, the thickness of the heat transfer part 30 is not particularly limited, and it may be about the same as the thickness of the case part 20.

[0068] The storage tank 40 is a member capable of supplying the reaction medium R to the case part 20 and recovering the reaction medium R from the case part 20. That is, the storage tank 40 has a tank structure or a tank structure provided with a space capable of storing the reaction medium R that chemically reacts (exothermic reaction) with the chemical heat storage material 15 inside, and a supply port 41 and a recovery port 42 for the reaction medium R are provided. The case part 20 (communication port 21) and the storage tank 40 (supply port 41 and recovery port 42) are connected by at least one pipe 70.

[0069] As the reaction medium R that can be stored in the storage tank 40, any substance that causes a chemical reaction (exothermic reaction) upon contact with the chemical heat storage material 15 may be used, and water, ammonia, alcohol, carbon dioxide, etc. can be used. Among these, if the reaction medium R is water, it is advantageous in terms of easy availability and easy handling. Also, when constructing a heat storage system, special facilities are not required, and it is possible to facilitate the handling in case of leakage, etc., so the equipment cost and operating cost can be reduced. In particular, when the heat storage system is for in-vehicle use, the reaction medium R is preferably water from the above viewpoints.

[0070] When water is used as the reaction medium R, the type of water is not particularly limited. For example, in addition to tap water (city water) and well water, distilled water, ion-exchanged water, etc. can be appropriately used. However, since the reaction medium R is repeatedly used in the heat storage system, it is preferably water (for example, ion-exchanged water) that can be used over a long period with components such as organic substances removed. By using such water, it is possible to suppress the deposition of organic substances, etc. in the storage tank 40 and the case part 20, etc., so that the operation of replacing water over a long period becomes unnecessary.

[0071] The material constituting the storage tank 40 is not particularly limited as long as it is not corroded by the reaction medium R and has sufficient strength not to break during use. Examples of typical materials can be metal materials, resin materials, or combinations of these materials.

[0072] The pipe 70 is provided with a cooling unit 71 for cooling and liquefying the gaseous reaction medium R generated during the heat storage process. The cooling unit 71 is not particularly limited, and a known cooling device can be used. For example, an air-cooling type cooling device having a plurality of heat dissipation plates and capable of cooling by increasing the contact area with the outside air, or a refrigerant type cooling device capable of cooling by contact with water or other refrigerants can be used.

[0073] The reaction medium R supplied from the storage tank 40 into the case part 20 may be in a gaseous state or a liquid state. When the reaction medium R supplied from the storage tank 40 into the case part 20 is in a gaseous state, as shown in FIG. 1, the pipe 70 connected to one communication port 21 of the case part 20 branches into two in the middle and is preferably connected to the supply port 41 and the recovery port 42 of the storage tank 40 respectively. Further, a valve 80 for switching the flow path of the reaction medium R flowing through the pipe 70 to the supply port 41 side or the recovery port 42 side is preferably provided at the branch part of the pipe 70. By switching the valve 80 so as to open the flow path on the supply port 41 side in the heat release process, the gaseous reaction medium R can be supplied into the case part 20. At this time, for example, by providing a decompression mechanism for decompressing the case part 20 side (for example, a decompression device such as a suction pump for decompressing the inside of the case part 20), the gaseous reaction medium R can be smoothly supplied to the case part 20. It should be noted that by switching the valve 80 so as to open the flow path on the recovery port 42 side in the heat storage process, the reaction medium R can be recovered from the inside of the case part 20.

[0074] Also, when the reaction medium R supplied from the storage tank 40 into the case portion 20 is in a gaseous state, as shown in FIG. 1, a heater 43 for vaporizing the reaction medium R is provided in the storage tank 40. The heater 43 is electrically connected to the power supply P, and the reaction medium R can be made gaseous by heating the reaction medium R with the heater 43.

[0075] An example of the heat storage system when the reaction medium R supplied from the storage tank 40 into the case portion 20 is in a liquid state is shown in FIG. 5. As shown in FIG. 5, it is preferable that the two communication ports 21 of the case portion 20 are respectively connected to the supply port 41 and the recovery port 42 of the storage tank 40 by pipes 70. Also, it is preferable that each pipe 70 is provided with a valve 81 capable of opening and closing each flow path. By opening the valve 81 provided in the pipe 70 connecting the communication port 21 of the case portion 20 and the supply port 41 of the storage tank 40 in the heat dissipation process, the liquid reaction medium R can be supplied into the case portion 20. Note that the pipe 70 connecting the communication port 21 of the case portion 20 and the supply port 41 of the storage tank 40 may be configured to be in direct contact with the heat storage portion 10. Also, by opening the valve 81 provided in the pipe 70 connecting the communication port 21 of the case portion 20 and the recovery port 42 of the storage tank 40 in the heat storage process, the reaction medium R can be recovered from within the case portion 20.

[0076] The heating mechanism 50 is not particularly limited as long as it is a mechanism capable of heating the heat storage portion 10. For example, the heating mechanism 50 can have at least one heater or a pair of electrodes that contact at least a part of the honeycomb structure. Here, FIG. 1 is an example of a heat storage system provided with a heater 51 as the heating mechanism 50. In this heat storage system, the heat storage portion 10 can be heated by heating the heater 51 electrically connected to the power supply P. FIG. 6 shows an example of a heat storage system provided with a pair of electrodes 52 as a heating mechanism 50. In this heat storage system, since the honeycomb structure generates heat by applying a voltage to a pair of electrodes 52 electrically connected to a power source P, the heat storage unit 10 can be heated. Although not shown in FIG. 6, when a pair of electrodes 52 are provided as the heating mechanism 50, it is preferable to provide an insulating structure around the pair of electrodes 52. The insulating structure is not particularly limited, and an insulator may be arranged so that the pair of electrodes 52 are not electrically connected to the case portion 20 and the heat transfer portion 30.

[0077] When a heater 51 is used as the heating mechanism 50, the type of the heater 51 is not particularly limited, and known heaters such as a band heater, a wire heater, a sheet heater, and an infrared heater can be used. The installation position of the heater 51 is not particularly limited, but as shown in FIG. 1, it is preferably provided on the end face side of the honeycomb structure on the side opposite to the communication port 21 of the case portion 20. By providing it at such a position, it becomes difficult to inhibit the contact between the chemical heat storage material 15 and the reaction medium R.

[0078] The shape of the heater 51 is not particularly limited, but it is preferably columnar with various cross-sectional shapes such as a circle, an ellipse, and a polygon (triangle, quadrilateral). Here, FIG. 7 shows an example of the cross-sectional shape of the columnar heater 51. Note that a plurality of heaters 51 having different shapes may be used in combination. By using the columnar heater 51 having such a cross-sectional shape, the heat storage unit 10 can be efficiently heated.

[0079] The position and number of the heaters 51 are not particularly limited, and can be appropriately adjusted according to the size of the heat storage unit 10 and the like. Here, FIG. 8 shows an example of the installation of the heater 51. FIG. 8 is a top view of the surface on which the heater 51 is installed.

[0080] When using a pair of electrodes 52 as the heating mechanism 50, the positions of the pair of electrodes 52 are not particularly limited. For example, as shown in FIG. 6, a pair of electrodes 52 can be provided on the surface of the outer peripheral wall 11 parallel to the direction in which the cells 13 of the honeycomb structure extend. Although not shown, a pair of electrodes 52 may be provided on both end faces (the first end face 12a and the second end face 12b).

[0081] The material of the pair of electrodes 52 is not particularly limited. For example, a material (metal or alloy) containing one or more selected from aluminum (Al), stainless steel (SUS), nickel (Ni), silver (Ag), and copper (Cu) can be used. Also, an ohmic electrode capable of making ohmic contact with the outer peripheral wall 11 and the partition wall 14 can be used. The ohmic electrode contains, for example, at least one selected from Al, Au, Ag, and In as a base metal and at least one selected from Ni, Si, Zn, Ge, Sn, Se, and Te for an n-type semiconductor as a dopant. The pair of electrodes 52 may have a single-layer structure or a laminated structure of two or more layers. When the pair of electrodes 52 has a laminated structure of two or more layers, the materials of each layer may be of the same type or different types.

[0082] The thickness of the pair of electrodes 52 is not particularly limited and can be appropriately set according to the formation method of the pair of electrodes 52. Examples of the formation method of the pair of electrodes 52 include metal deposition methods such as sputtering, evaporation, electrolytic deposition, and chemical deposition. Also, the pair of electrodes 52 can be formed by applying an electrode paste and then baking it, or by thermal spraying. Furthermore, the pair of electrodes 52 may be formed by joining a metal plate or an alloy plate.

[0083] The flow path structure 60 is connected to the heat transfer part 30 and is structured to transport the heat transfer medium heated in the heat transfer part 30 to the heating target part 90 to heat the heating target part 90. The flow path structure 60 can be formed by a pipe 61. The heating target part 90 is not particularly limited and can be appropriately selected according to the application of the heat storage system. For example, when the heat storage system is for a vehicle, the heating target part 90 is an engine, mechanism, device, drive circuit, system, etc. that requires heat supply. Specific examples of the heating target part 90 include an air conditioning system, a battery, oil, a transmission, a fuel injection valve, a fuel cell, etc. Among these, it is preferable to use the battery as the heating target part 90.

[0084] For example, electric vehicles such as EVs (electric vehicles) and HEVs (hybrid vehicles) are equipped with a battery composed of a lithium-ion battery or the like for supplying power to a driving motor. However, the output characteristics of this battery vary with temperature changes. In particular, when an electric vehicle is parked for a long time in a cold region and the battery is in an extremely low temperature state, the output characteristics of the battery will significantly decrease. In a state where the output has significantly decreased, sufficient power cannot be supplied to the driving motor. Also, in such a low temperature state, in order to stabilize the output of the battery, the battery body must be heated, and power is consumed for heating, resulting in a reduction in the cruising range of the vehicle. Therefore, by using the battery as the heating target part 90, the cruising range of the electric vehicle can be improved.

[0085] Also, for example, an industrial furnace releases heat together with exhaust gas, and the heat loss from the exhaust gas is large. Therefore, by using the waste heat recovered from the exhaust gas for heating inside the industrial furnace, fuel reduction becomes possible, and as a result, it can also contribute to the reduction of CO 2 Normally, an exhaust heat recovery device is generally used for the utilization of waste heat. However, since the waste heat recovered needs to be used immediately, it will be discarded without being used when the heat is not needed. Therefore, by using the heat storage system according to Embodiment 1 of the present invention, heat can be used at the desired timing without being used immediately, and the heat that is usually discarded can be significantly reduced. Therefore, when the heat storage system is applied to the exhaust system of an industrial furnace, the heating target part 90 can be the industrial furnace. Specifically, by supplying the reaction medium R into the case part 20, the heat dissipation reaction is started, and the heat can be utilized for heating in the industrial furnace. In the above description, an example of using the heat storage system in a stationary manner has been described. However, after heat storage, a part of the heat storage system (for example, the case part 20 that houses the heat storage part 10) may be removed, and the removed part may be installed in a heat storage system installed at another location for use. For example, in agricultural facilities, the removed part may be installed and used in a heat storage system used for heating greenhouses such as vinyl houses. After use, the part may be removed and installed in the original heat storage system to carry out the heat storage process.

[0086] Next, the heat storage process (heat storage in the heat storage part 10) and the heat dissipation process (heat dissipation in the heat storage part 10) of the heat storage system will be described. The heat storage process is performed by heating the heat storage part 10 by the heating mechanism 50. At this time, in the heat storage system shown in FIG. 1, the valve 80 is switched so as to release the flow path on the recovery port 42 side. When the heat storage part 10 is heated, the chemical heat storage material 15 changes by an endothermic reaction (for example, a dehydration reaction). For example, when Ca(OH) 2 is used as the chemical heat storage material 15, it changes to CaO by an endothermic reaction (dehydration reaction). Similarly, when Mg(OH) 2 is used as the chemical heat storage material 15, it changes to MgO by an endothermic reaction (dehydration reaction). CaO and MgO can maintain their states as they are even when the temperature drops as long as there is no contact with water. The reaction medium R (water vapor) generated by the endothermic reaction in the heat storage process passes through the pipe 70, is cooled and liquefied in the cooling part 71, and is recovered in the storage tank 40.

[0087] When the heat storage process is for a vehicle, it is preferably performed during charging of the vehicle. By performing the heat storage process during charging of the vehicle, heat can be stored without reducing the capacity of the battery, leading to an improvement in the cruising range.

[0088] The heat release process is performed by supplying the reaction medium R to the case portion 20 and bringing the reaction medium R into contact with the chemical heat storage material 15. When the reaction medium R is brought into contact with the chemical heat storage material 15, an exothermic reaction (for example, a hydration reaction) occurs and heat is generated. In the heat storage system shown in FIG. 1, by switching the valve 80 so as to open the flow path on the supply port 41 side and heating the reaction medium R with the heater 43 to make the reaction medium R gaseous, the gaseous reaction medium R can be supplied into the case portion 20.

[0089] The heat generated in the heat release process exchanges heat with the heat transport medium in the heat transfer portion 30 flowing outside the case portion 20, and the heat transport medium is heated. The heated heat transport medium is transported to the heating target portion 90, and the heating target portion 90 is heated.

[0090] When the heat release process is for a vehicle, it is preferably performed during warm-up operation or start of travel of the vehicle. By performing the heat release process during warm-up operation or start of travel of the vehicle, the power consumption for the heating target portion 90 such as the battery can be suppressed, leading to an improvement in the cruising range.

[0091] (Embodiment 2) FIG. 9 is an overall schematic configuration diagram of a heat storage system according to Embodiment 2 of the present invention. As shown in FIG. 9, the heat storage system according to Embodiment 2 of the present invention includes a heat storage portion 10, a case portion 20, a heat transfer portion 30, a storage tank 40, a heating gas supply structure 100, and a flow path structure 60. That is, the heat storage system according to Embodiment 2 of the present invention is different from the heat storage system according to Embodiment 1 of the present invention in that a heating gas supply structure 100 is used instead of the heating mechanism 50. In addition, components having the same reference numerals as those appearing in the description of the heat storage system according to Embodiment 1 of the present invention are the same as the components of the heat storage system according to Embodiment 2 of the present invention, and thus detailed descriptions thereof are omitted.

[0092] The heating gas supply structure 100 has a heating gas supply port 22 provided in the case portion 20. The heating gas supply port 22 is connected to a pipe 110 through which the heating gas flows. By supplying the heating gas into the case portion 20, the heat storage portion 10 can be heated.

[0093] The heating gas is not particularly limited, but can be a gas heated by an internal combustion engine and / or a heater. Note that FIG. 9 shows an example of a form in which a gas heated by a heat source 120 such as an internal combustion engine, a heater, or an industrial furnace is used. As specific examples of the heating gas, exhaust gas discharged from an internal combustion engine or an industrial furnace, a gas (air or exhaust gas) heated by various heaters, etc. can be used. The latter gas includes exhaust gas heated by an electric heating type catalyst device (EHC), etc. Among these, by using the heated exhaust gas, the heat of the exhaust gas can be effectively utilized, and it becomes possible to perform the heat storage process during running.

[0094] From the viewpoint of stably supplying the heating gas into the case portion 20, the heating gas supply structure 100 may include a blower 130. Further, when the gas is heated by a heater, the heater may be located upstream of the blower 130 or downstream of the blower 130. Also, the heating gas supply structure 100 preferably includes a valve 82 capable of opening and closing the flow path of the pipe 110. By providing the valve 82, it is possible to suppress the reaction medium R from entering the heating gas supply structure 100 during the heat dissipation process.

[0095] The heat storage process (heat storage in the heat storage portion 10) of this heat storage system will be described. Note that the heat dissipation process (heat dissipation in the heat storage portion 10) of this heat storage system is the same as the above-described heat storage system, and thus the description thereof is omitted. The heat storage process is performed by supplying a heating gas to the case part 20 and heating the heat storage part 10. At this time, in the heat storage system shown in FIG. 9, the valve 80 is switched so as to release the flow path on the recovery port 42 side. When the heat storage part 10 is heated, the chemical heat storage material 15 changes by an endothermic reaction (for example, dehydration reaction). The reaction medium R (water vapor) generated by the endothermic reaction of the heat storage process passes through the pipe 70, is cooled and liquefied in the cooling part 71, and is recovered in the storage tank 40. The heat storage process as described above is preferably performed when the vehicle is charging or running when the heat storage system is for a vehicle. By performing the heat storage process when the vehicle is charging, heat can be stored without reducing the capacity of the battery, which leads to an improvement in the cruising range. In addition, by performing the heat storage process when the vehicle is running, the heat of the exhaust gas can be effectively utilized by the heat storage system.

[0096] (Embodiment 3) FIGS. 10A and 10B are overall schematic configuration diagrams of the heat storage system according to Embodiment 3 of the present invention. FIG. 10A is a state diagram during the heat storage process of this heat storage system, and FIG. 10B is a state diagram during the heat release process of this heat storage system. Further, FIG. 11 is a cross-sectional view perpendicular to the direction in which the cells of the heat storage part and the heat transfer part of the heat storage system according to Embodiment 3 of the present invention extend.

[0097] As shown in FIGS. 10A and 10B, the heat storage system according to Embodiment 3 of the present invention is common to the heat storage system according to Embodiment 2 of the present invention in that it includes a heat storage part 10, a case part 20, a heat transfer part 30, a storage tank 40, a heating gas supply structure 100, and a flow path structure 60. However, the heat storage system according to Embodiment 3 of the present invention is different from the heat storage system according to Embodiment 2 of the present invention in the structures of the heat storage part 10, the case part 20, the heat transfer part 30, and the members related thereto. Note that components having the same reference numerals as those appearing in the descriptions of the heat storage systems according to Embodiments 1 and 2 of the present invention are the same as the components of the heat storage system according to Embodiment 3 of the present invention, and thus detailed descriptions thereof are omitted. Further, within a range that does not inhibit the effects of the heat storage system according to Embodiment 3 of the present invention, each configuration of the heat storage systems according to Embodiments 1 and 2 of the present invention can be applied.

[0098] In this heat storage system, the heat transfer part 30 is provided in the central region of the honeycomb structure body constituting the heat storage part 10 in a direction parallel to the direction in which the cells 13 of the honeycomb structure body extend. The heat transfer part 30 may be a hollow region, but preferably has a honeycomb structure. By having a honeycomb structure, the heat storage part 10 can be efficiently heated by the heating gas in the heat storage process.

[0099] The heat storage part 10 and the heat transfer part 30 may be manufactured by individually manufacturing each honeycomb structure body and fitting them together, or after manufacturing one honeycomb structure body, each honeycomb structure body corresponding to the heat storage part 10 and the heat transfer part 30 may be formed by performing processing such as cutting. When individually manufacturing the honeycomb structure body constituting the heat transfer part 30, it may be manufactured using the same material and method as the honeycomb structure body constituting the heat storage part 10.

[0100] As shown in FIG. 11, the heat storage part 10 is a hollow honeycomb structure body (honeycomb structure part) in which the chemical heat storage material 15 is held in at least a part of the cells 13, and is arranged around the heat transfer part 30 in a cross section perpendicular to the direction in which the cells 13 extend. Further, the heat transfer part 30 is a solid honeycomb structure body (honeycomb structure part) arranged inside the hollow honeycomb structure body (honeycomb structure part) constituting the heat storage part 10 in a cross section perpendicular to the direction in which the cells 13 extend.

[0101] The case part 20 is arranged to be in direct or indirect contact with the outer peripheral wall 11 of the honeycomb structure that constitutes the heat storage part 10 and to have a space between the first end face 12a and the second end face 12b. By providing the case part 20 in this way, it becomes possible to supply the reaction medium R from the storage tank 40 to the heat storage part 10 and to recover the reaction medium R from the heat storage part 10 to the storage tank 40.

[0102] The heating gas supply structure 100 is connected to the upstream end of the heat transfer part 30 with reference to the flow of the heating gas. The pipe 110 that constitutes the heating gas supply structure 100 branches into two in the middle. One is connected to a heat source 120 such as an internal combustion engine or an industrial furnace, and the other is connected to a supply port for taking in ambient gas. Further, a valve 83 for switching the flow path is provided at the branch part of the pipe 110.

[0103] The flow path structure 60 is connected to the downstream end of the heat transfer part 30 with reference to the flow of the heating gas. The pipe 61 that constitutes the flow path structure 60 branches into two in the middle. One is connected to the part to be heated 90, and the other is connected to a discharge port for discharging the gas. Further, a valve 84 for switching the flow path is provided at the branch part of the pipe 61.

[0104] The heat storage process and the heat release process of the heat storage system having the above structure will be described. In the heat storage process, as shown in FIG. 10A, the valve 83 is switched so that the heating gas from the heat source 120 flows in the heating gas supply structure 100, and the valve 84 is switched so that the gas is discharged in the flow path structure 60. Next, the heat storage part 10 is heated by supplying the heating gas from the heat source 120 to the heat transfer part 30. When the heat storage part 10 is heated, the chemical heat storage material 15 changes by an endothermic reaction (for example, a dehydration reaction). The reaction medium R (water vapor) generated by the endothermic reaction in the heat storage process passes through the pipe 70, is cooled and liquefied in the cooling part 71, and is recovered in the storage tank 40.

[0105] In the heat release process, as shown in FIG. 10B, the valve 83 is switched so as to take in the ambient gas in the heating gas supply structure 100, and the valve 84 is switched so that the gas flows through the heat target portion 90 in the flow path structure 60. Next, the reaction medium R is supplied from the storage tank 40 into the case portion 20, and the reaction medium R is brought into contact with the chemical heat storage material 15 of the heat storage portion 10. When the reaction medium R (the reaction medium R at this time may be supplied in a liquid state or a gaseous state) is brought into contact with the chemical heat storage material 15, an exothermic reaction (for example, a hydration reaction) occurs and heat is generated. The generated heat exchanges heat with the ambient gas flowing inside the heat storage portion 10 to heat the ambient gas (heat transport medium), and the heated ambient gas is transported to the heat target portion 90 to heat the heat target portion 90.

Explanation of Signs

[0106] 10 Heat storage portion 11 Outer peripheral wall 12a First end face 12b Second end face 13 Cell 14 Partition wall 14a First partition wall 14b Second partition wall 15 Chemical heat storage material 16 Plugging portion 20 Case portion 21 Communication port 22 Heating gas supply port 30 Heat transfer portion 40 Storage tank 41 Supply port 42 Recovery port 43 Heater 50 Heating mechanism 60 Flow path structure 61 Pipe 70 Pipe 71 Cooling portion 80,81,82,83,84 Valve 90 Heat target portion 100 Heating gas supply structure 110 Pipe 120 Heat source 130 Blower

Claims

1. A honeycomb structure having an outer peripheral wall and partition walls disposed inside the outer peripheral wall and defining a plurality of cells extending from a first end face to a second end face, wherein at least one heat storage section is held in at least some of the cells of the honeycomb structure, the heat storage section being capable of storing heat by a heating reaction and releasing heat by a reaction with a reaction medium; A case portion that houses the heat storage portion; a heat transfer section through which a heat transport medium flows and capable of heating the heat transport medium by heat dissipated from the heat storage section; A storage tank capable of supplying the reaction medium to the case portion and recovering the reaction medium from the case portion; A heating mechanism and / or a heating gas supply structure capable of heating the heat storage unit; a flow path structure connected to the heat transfer section, capable of transporting the heat transport medium heated by the heat transfer section to a heating target section and heating the heating target section; A heat storage system comprising:

2. The heat storage system according to claim 1 , wherein the case portion is in direct or indirect contact with the outer peripheral wall of the honeycomb structure.

3. The heat storage system according to claim 1 or 2, wherein the heat transfer section has a jacket section arranged at intervals on the outer periphery of the case section parallel to the extension direction of the cells of the honeycomb structure so as to form a flow path for the heat transport medium.

4. The heat storage system according to claim 1 or 2, wherein the heat transfer portion is provided in a central region of the honeycomb structure, the central region being parallel to a direction in which the cells of the honeycomb structure extend.

5. The heat storage system according to claim 4 , wherein the heat transfer portion has a honeycomb structure.

6. The heat storage system according to claim 1 or 2, wherein the heating mechanism has at least one heater or a pair of electrodes in contact with at least a portion of the honeycomb structure.

7. the heating gas supply structure has a heating gas supply port provided in the case portion, The heat storage system according to claim 1 or 2, wherein the heating gas supply port is connected to a pipe through which the heating gas flows.

8. The heat storage system according to claim 7 , wherein the heating gas is heated by an internal combustion engine and / or a heater.

9. The case and the storage tank are connected by at least one pipe, The heat storage system according to claim 1 , further comprising a pressure reducing mechanism that reduces the pressure on the case side when the reaction medium is supplied from the storage tank to the case.

10. The heat storage system according to claim 1 or 2, wherein the reaction medium supplied to the case portion is in a liquid state.

11. The heat storage system according to claim 1 or 2, wherein the reaction medium supplied to the case portion is in a gaseous state, and a heater for vaporizing the reaction medium is provided in the storage tank.

12. The heat storage system according to claim 1 or 2, wherein the chemical heat storage material is filled in the cells.

13. The heat storage system according to claim 1 , wherein porous plugging portions are provided on the first end face side and the second end face side of the cells filled with the chemical heat storage material.

14. The heat storage system according to claim 1 or 2, wherein a ratio of the cells in which the chemical heat storage material is held to all the cells of the honeycomb structure is 10% or more.

15. The heat storage system according to claim 1 or 2, wherein the reaction medium is at least one selected from the group consisting of water, ammonia, alcohol, and carbon dioxide.

16. The heat storage system according to claim 1 or 2, wherein the partition walls are porous.

17. The heat storage system according to claim 1 or 2, which is mounted on a vehicle.

18. The heat storage system according to claim 17, wherein the chemical heat storage material is at least one selected from the group consisting of hydroxides of alkali metals and hydroxides of alkaline earth metals.

19. The heat storage system according to claim 17, wherein heat storage in the heat storage section is performed when the vehicle is being charged or traveling.

20. The heat storage system according to claim 17, wherein the heat storage section releases heat when the vehicle is warmed up or starts running.

21. The heat storage system according to claim 17 , wherein the part to be heated is a battery.

22. The heat storage system according to claim 1 or 2, wherein the heating target is an industrial furnace.

23. The heat storage system according to claim 1 or 2, wherein the object to be heated is a greenhouse.

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