JP6877205B2 - Heat storage device - Google Patents

Description

In the present invention, a heat storage material (for example, a chemical heat storage material, zeolite, etc.) reacts with a reaction medium (for example, water, etc.) to release heat, and the heat is stored to desorb the reaction medium (hereinafter, "heat absorption"). It relates to a heat storage device that can repeat heat generation and heat storage by utilizing the action.

In recent years, storage and utilization of exhaust heat in industrial plants and the like, and heat storage devices for storing and utilizing exhaust heat obtained from automobile engines and exhaust gas have been studied.

Therefore, as shown in FIG. 5, the chemical heat storage material composite containing the powder chemical heat storage material 62 and the foam expansion material 63 arranged adjacent to the chemical heat storage material 62 is the inner pipe 61 and the outer pipe 67. A reaction flow path 64, which is accommodated between the two, and through which water vapor as a reaction product / reaction product associated with heat storage / heat dissipation of the chemical heat storage material 62 flows, is formed in the inner pipe 61 and is connected to the chemical heat storage material 62. A heat storage container 6 is proposed in which a heat exchange flow path 66 through which a gaseous fluid, which is a heat exchange medium for heat exchange, flows is provided between an outer tube 67 and an outer wall 65 (Patent Document 1). ..

On the other hand, in order to improve the heat transport amount, a heat storage device has been proposed in which liquid phase water (heat transport fluid L) is supplied as a reaction medium of the heat storage material 12 to the heat storage container 1 containing the heat storage material 12. In this heat storage device, a part of the supplied water reacts with the heat storage material 12 to generate heat, and the rest of the water receives the heat and vaporizes it, thereby functioning as a heat transport medium ( Patent Document 2).

However, when water is supplied to the heat storage material 12 as in the heat storage device 1 of Patent Document 2, the pressure in the heat storage container 11 rises due to the evaporation of water, and the working fluid of the gas phase in the heat storage container 11 Distribution was sometimes hindered. There is a problem that the heat storage / heat dissipation efficiency of the heat storage container 11 and the heat transport efficiency of the heat exchange medium may decrease due to the obstruction of the flow of the working fluid in the gas phase. In addition, when the heat storage device receives heat and stores heat, if the pressure inside the device is high, the reaction medium does not separate from the heat storage material, the heat storage temperature rises, and the time until heat storage is completed becomes long. There was a problem.

Japanese Unexamined Patent Publication No. 2009-228952 International Publication No. 2016/121778

The present invention has been made in view of the above problems, and provides a heat storage device capable of preventing a decrease in heat storage / heat dissipation efficiency and a decrease in heat transport efficiency by preventing a pressure increase in the working fluid of the gas phase in the system. The purpose is to provide.

Aspects of the present invention include a heat storage unit containing a heat storage material, a reaction medium storage unit connected to the heat storage unit via a first piping system, and a reaction medium storage unit that stores a reaction medium that reacts with the heat storage material. It has the heat storage unit and the heat exchange unit connected via the second piping system and the reaction medium storage unit and the heat exchange unit via the third piping system, and has the second piping system or the said. This is a heat storage device in which a pressure adjusting unit is provided in the third piping system.

In the above embodiment, the reaction medium storage unit to the heat storage unit, the heat storage unit to the heat exchange unit, and the heat exchange unit to the reaction medium storage unit are used by the first piping system, the second piping system, and the third piping system, respectively. A circulation system in which the fluid circulates is formed.

An aspect of the present invention is a heat storage device in which the pressure adjusting unit is provided in the third piping system.

An aspect of the present invention is a heat storage device in which the pressure adjusting unit is a decompression means for depressurizing the inside of the heat storage unit.

In an aspect of the present invention, the heat storage portion comprises a tubular body, the heat storage material housed in the tubular body, a flow path penetrating the tubular body in the longitudinal direction, and the heat storage material and the flow path. It is a heat storage device having a diffusion layer provided between them.

Aspects of the present invention include the heat storage unit, the reaction medium storage unit in which the reaction medium of the liquid phase is housed, which is connected to one end of the tubular body via the first piping system. Circulation provided with the other end of the tubular body and the heat exchange section connected via the second piping system and connected via the reaction medium storage section and the third piping system. A heat storage device having a system and the circulation system being airtight and degassed.

Aspects of the present invention include a heat storage unit containing a heat storage material, a reaction medium storage unit connected to the heat storage unit via a first piping system, and a reaction medium storage unit that stores a reaction medium that reacts with the heat storage material. It has the heat storage unit and the heat exchange unit connected via the second piping system and the reaction medium storage unit and the heat exchange unit via the third piping system, and has the second piping system or the said. A heat storage system using a heat storage device provided with a pressure adjusting unit in a third piping system, wherein the reaction medium is supplied to the heat storage unit, the heat storage unit stores heat, and / or the heat storage unit. This is a heat storage system in which the pressure adjusting unit operates at the timing when heat is released from the unit.

According to the aspect of the present invention, the pressure adjusting unit is provided in the second piping system connecting the heat storage unit and the heat exchange unit or the third piping system connecting the heat exchange unit and the reaction medium storage unit. , It is possible to prevent the pressure rise of the working fluid of the gas phase in the circulation system of the heat storage device. Therefore, since the flow of the working fluid of the gas phase in the circulation system of the heat storage device is promoted, it is possible to prevent a decrease in heat storage / heat dissipation efficiency and a decrease in heat transport efficiency.

According to the aspect of the present invention, since the pressure adjusting section is provided in the second piping system or the third piping system, the surplus reaction medium remaining in the heat storage section is smoothly transported to the reaction medium storage section. Can be recovered.

According to the aspect of the present invention, since the pressure adjusting unit is provided in the third piping system connecting the heat exchange unit and the reaction medium storage unit, unnecessary heat dissipation between the heat storage unit and the heat exchange unit is provided. Therefore, the heat transport efficiency is further improved.

According to the aspect of the present invention, since the pressure adjusting unit is a decompression means for depressurizing the inside of the heat storage unit, the desorption of the reaction medium from the heat storage material is promoted, so that the heat storage temperature of the heat storage material can be reduced and the heat storage material can be reduced. The heat storage of the material can be facilitated. Further, since the pressure adjusting unit is a depressurizing means for reducing the pressure in the heat storage unit, the reaction medium can be smoothly supplied from the reaction medium storage unit to the heat storage material in the heat storage unit when the heat storage device is started.

(A) is a side sectional view of the heat storage unit according to the first embodiment, and (b) is a sectional view taken along the line AA'of the heat storage unit in FIG. 1 (a). (A) is a side sectional view of the heat storage unit according to the second embodiment, and (b) is a sectional view of the heat storage unit BB'in FIG. 2 (a). It is explanatory drawing of the heat storage apparatus which concerns on 1st Embodiment example of this invention. It is explanatory drawing of the heat storage apparatus which concerns on 2nd Embodiment of this invention. It is explanatory drawing of the conventional heat storage apparatus.

The heat storage device according to the embodiment of the present invention will be described below. As shown in FIG. 3, the heat storage device 100 according to the first embodiment of the present invention is connected to the heat storage unit 2 in which zeolite 12 is housed as the heat storage material via the heat storage unit 2 and the first piping system 102. The reaction medium storage unit 101 in which the adsorbed material (also referred to as “reaction medium”) adsorbed on the zeolite 12 is stored is connected to the heat storage unit 2 via the second piping system 104 and reacts. It includes a medium storage unit 101 and a heat exchange unit 106 connected via a third piping system 107. Therefore, in the heat storage device 100, the reaction medium storage unit 101 to the heat storage unit 2 and the heat storage unit 2 to the heat exchange unit 106 are used by the first piping system 102, the second piping system 104, and the third piping system 107, respectively. A circulation system capable of circulating fluid is formed from the heat exchange unit 106 to the reaction medium storage unit 101.

Further, the third piping system 107 is provided with a pressure adjusting unit 110. The pressure in the circulation system of the heat storage device 100 is adjusted by the pressure adjusting unit 110.

In the description of the heat storage device according to the embodiment of the present invention described above, first, the heat storage unit used in the heat storage device according to the embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1A, the heat storage unit 1 according to the first embodiment comprises a tubular body 11 which is a tubular body with both ends open and a zeolite 12 arranged inside the tubular body 11. I have. Further, the heat storage unit 1 includes a first lid 15 made of a porous body arranged adjacent to one end 13 side of the tubular body 11 of the zeolite 12, and the other of the tubular body 11 of the zeolite 12. Adjacent to the inner side surface of the zeolite 12 between the second lid 16 made of a porous body arranged adjacent to the end portion 14 side of the first lid 15 and the second lid 16. A first wick structure 17 having a capillary structure, which is a diffusion layer for transporting a liquid, is provided.

As shown in FIG. 1 (b), the radial cross section of the tubular body 11 is circular. Further, the zeolite 12 has a form in which the powder is molded into a tubular shape, and the cross section in the radial direction is circular. The central axis of the tubular body 11 and the central axis of the zeolite 12 which is tubular are arranged coaxially.

Both the first lid body 15 and the second lid body 16 have a circular shape in which a hole portion is formed in the central portion, and the wall surface of the hole portion 15'of the first lid body 15 and the second lid. The wall surface of the hole portion 16'of the body 16 is a part of the wall surface of the flow path 18 described later, and also forms an end portion of the flow path 18. Therefore, the holes 15'and 16'have shapes and dimensions corresponding to the shape and dimensions of the radial cross section of the flow path 18.

As shown in FIGS. 1 (a) and 1 (b), in the heat storage unit 1, the first lid body 15, the second lid body 16, the first wick structure 17, and the inner surface of the tubular body 11 are respectively. It is in direct contact with the site of the opposing zeolite 12. The first lid 15 covers the end face of one end of the zeolite 12, the second lid 16 covers the end face of the other end of the zeolite 12, and the first wick structure 17 is inside the zeolite 12. The side surface is covered, and the inner surface of the tubular body 11 covers the outer side surface of the zeolite 12. The first lid body 15 and the second lid body 16 are housed inside the tubular body 11 more than one end portion 13 and the other end portion 14, respectively. Further, the first wick structure 17 is connected to the peripheral edge of the hole 15'on the surface of the first lid 15 and the peripheral edge of the hole 16'on the surface of the second lid 16, respectively. .. Specifically, one end of the first wick structure 17 comes into contact with the first lid 15 having a hole 15'forming one open end of the flow path 18, and the first The other end of the wick structure 17 of 1 is in contact with a second lid 16 having a hole 16'forming the other open end of the flow path 18. Therefore, in the heat storage unit 1, the zeolite 12 is covered in contact with the inner surface of the first lid 15, the second lid 16, the first wick structure 17, and the tubular body 11.

In the heat storage unit 1, the shape of the first wick structure 17 is tubular, and the cross section in the radial direction is circular. That is, inside the first wick structure 17, a space portion that penetrates the tubular body 11 in the major axis direction, that is, a flow path 18 is provided. Therefore, the inner peripheral surface of the first wick structure 17 is the wall surface of the flow path 18.

Since the zeolite 12 is covered in contact with the inner surface of the first lid 15, the second lid 16, the first wick structure 17, and the tubular body 11, it is a liquid as an adsorbed object of the zeolite 12. Can be used to maintain the shape of the molded zeolite 12. Therefore, the first wick structure 17 also functions as a holding member in the shape of the zeolite 12. A part of the liquid phase heat transport fluid (reaction medium) L, which is the working fluid of the heat storage device, is supplied to one end of the zeolite 12 via the first lid 15. Further, due to the capillary force of the first wick structure 17, the heat transport fluid L of the liquid phase is smoothly supplied from one end of the zeolite 12 to the entire inner side surface of the zeolite 12. That is, due to the capillary force of the first wick structure 17, the heat transport fluid L of the liquid phase is moved along the longitudinal direction of the first wick structure 17, that is, along the major axis direction of the tubular body 11. , Is smoothly and reliably diffused from one end of the zeolite 12 to the other end.

Since the first wick structure 17 is in contact with the inner peripheral surface of the zeolite 12, the liquid phase heat transport fluid L absorbed by the first wick structure 17 is rapidly adsorbed by the zeolite 12. Heat H is released. That is, the zeolite 12 functions as a heat storage material.

The heat H released from the zeolite 12 moves to the heat transport fluid L of the liquid phase supplied from one end of the flow path 18. As a result, the heat transport fluid L in the liquid phase undergoes a phase change from the liquid phase to the gas phase while moving from one end to the other in the flow path 18. The heat transport fluid vaporized in the flow path 18 (that is, the heat transport fluid G in the gas phase) is discharged from the other end of the flow path 18 to the outside of the heat storage section 1, and further transports heat H to the heat exchange section. To do. In this way, the flow path 18 functions as a passage for the heat transport fluid G in the gas phase. In the heat storage unit 1, the radial cross section of the flow path 18 is circular, and the central axis of the flow path 18 is arranged coaxially with the central axis of the tubular body 11.

As described above, the liquid phase heat transport fluid L functions as an object to be adsorbed that contributes to heat absorption and heat generation of the zeolite 12 in the reaction medium of the heat storage material and the heat storage unit 1, and heats the heat stored in the zeolite 12. It also functions as a medium for heat transport to be transported to the exchange section. Therefore, it is not necessary to separate the path of the object to be adsorbed and the path of the heat transport fluid from each other, and the structure of the piping path can be simplified. Further, since the object to be adsorbed in the liquid phase instead of the gas phase is adsorbed on the zeolite, an excellent heat storage density can be obtained.

As the zeolite 12, for example, a zeolite 12 having a heat storage temperature of 150 ° C. or higher and 350 ° C. or lower is stored in the heat storage unit 1. By using the zeolite 12 in the heat storage unit 1, heat can be stored in the heat storage unit 1 even when the environmental temperature in which the heat storage unit 1 is arranged is 350 ° C. or lower. Therefore, the degree of freedom in selecting the installation location of the heat storage unit 1 is improved as compared with the heat storage device using a chemical heat storage material such as calcium oxide.

The zeolite 12 stored in the heat storage unit 1 has the following general formula (1).
Me _{2 / x} O ・ Al ₂ O ₃・ mSiO ₂・ nH ₂ O (1)
(In the formula, Me means a cation, x means a valence of Me, m means 2.0 or more, and n is not particularly limited and is appropriately selected, and examples thereof include 0 to 15.). expressed. The value of m (that is, the silica-alumina ratio) in the general formula (1) is not particularly limited, but when water is used as the adsorbed material, the adsorption characteristics of the adsorbed material on the zeolite 12 are improved, which is good. From the viewpoint of obtaining heat storage density, 2.0 or more and less than 5.0 (that is, hydrophilic zeolite) is preferable.

The first lid 15 and the second lid 16 are porous bodies having through holes having dimensions that allow the heat transport fluid L in the liquid phase to pass through but not the zeolite 12. The size (average diameter) of the through hole of the porous body is not particularly limited as long as it has the above-mentioned function, and is, for example, 50 micrometers or less. The material of the first lid 15 and the second lid 16 is not particularly limited, and for example, a sintered body of a metal powder such as copper powder, a metal mesh, a foamed metal, or a metal foil provided with a through hole. , A metal plate provided with a through hole and the like can be mentioned.

The first wick structure 17 is not particularly limited as long as it has a structure having a capillary structure, and examples thereof include members such as a metal sintered body and a metal mesh constructed by firing a powdery metal material. Can be done. Further, the first wick structure 17 may be separate from the first lid 15 and the second lid 16 like the heat storage unit 1, and the first wick structure 17 may be made of copper powder or the like. When a metal powder sintered body or a metal mesh is used, it may be integrated with the first lid body 15 and the second lid body 16.

The material of the tubular body 11 is not particularly limited, and examples thereof include copper, aluminum, and stainless steel. Examples of the liquid phase heat transport fluid (reaction medium) L include water, alcohol such as ethanol, and a mixture of water and alcohol.

Next, the heat storage unit according to the second embodiment will be described with reference to the drawings. The same components as the heat storage unit according to the first embodiment will be described with reference to the same reference numerals. As shown in FIGS. 2A and 2B, in the heat storage unit 2 according to the second embodiment, the first wick has a tubular shape in the long axis direction and a circular cross section in the radial direction. An inner pipe 19 which is a pipe material having both ends open is fitted into the inner peripheral surface of the structure 17. Therefore, in the heat storage unit 2 according to the second embodiment, the inner surface of the inner pipe 19 is the wall surface of the flow path 28. Further, the inner peripheral surface of the first wick structure 17 and the outer surface of the inner tube 19 come into contact with each other, so that the inner tube 19 is thermally connected to the first wick structure 17.

The radial cross section of the inner tube 19 is circular, and the central axis of the inner tube 19 (that is, the central axis of the flow path 28) is arranged coaxially with the central axis of the tubular body 11. Further, the end portion of the inner pipe 19 is located inside the one end portion 13 and the other end portion 14 of the tubular body 11.

In the heat storage unit 2 according to the second embodiment, the heat H received by the first wick structure 17 is received in the flow path 28 supplied from one end of the flow path 28 via the inner pipe 19. , Move to the heat transport fluid L of the liquid phase. Further, by inserting the inner tube 19 into the inner peripheral surface of the first wick structure 17, the inner side surface of the first wick structure 17 is protected from the external environment. Further, since the inner pipe 19 can prevent the shape change of the first wick structure 17, the shape of the flow path 28 can be surely maintained.

The material of the inner tube 19 is not particularly limited, and examples thereof include copper, aluminum, and stainless steel. The heat storage unit 2 according to the second embodiment is a heat storage unit used in the heat storage device according to the first embodiment of the present invention described above.

Next, the operation of the heat storage unit according to each of the above embodiments will be described. Here, the heat storage unit 1 according to the first embodiment will be described as an example. When the heat storage unit 1 is installed close to, for example, a fluid (for example, exhaust gas) to be recovered from heat, the outer surface of the tubular body 11 receives heat from the fluid and transfers the received heat into the heat storage unit 1. To do. The heat transferred from the fluid through the outer surface of the tubular body 11 is transferred to the zeolite 12 which is thermally connected by contacting with the inner surface of the tubular body 11. When the zeolite 12 receives the heat, it releases the adsorbed substance as a gas.

On the other hand, the heat transport fluid L of the liquid phase supplied to the heat storage unit 1 is adsorbed by the heat-stored zeolite 12, and the heat H is released from the zeolite 12.

The heat H released from the zeolite 12 is transferred to the liquid phase heat transport fluid L supplied to the heat storage unit 1, and a part of the liquid phase heat transport fluid L undergoes a phase change from the liquid phase to the gas phase. .. The heat transport fluid G of the gas phase that has undergone a phase change from the liquid phase in the flow path 18 is transported from the heat storage unit 1 to the heat exchange unit as a heat medium that transports the heat H, that is, as a heat transport fluid.

The heat storage unit 1 may be provided with heat exchange means, for example, fins or the like on the outer surface of the tubular body 11 in order to improve the heat recovery efficiency from the fluid to be heat recovered.

Next, an example of a method for manufacturing a heat storage unit used in the heat storage device of the present invention will be described. Here, the heat storage unit 2 according to the second embodiment will be described as an example. The method for manufacturing the heat storage unit 2 is not particularly limited, but for example, first, the zeolite 12 is inserted in a tubular shape along the inner surface of the tubular body 11 in the long axis direction of the tubular body 11. At this time, if necessary, as the slurry containing the zeolite 12, a slurry containing a binder, an additive, or the like in addition to the particles of the zeolite 12 may be used. Examples of the binder include clay-based minerals (sepiolite, talc, etc.), vinyl alcohol-based, (meth) acrylic-based organic binders, and inorganic binders such as alumina sol. When a binder is used, it can remain and solidify together with the particles of the zeolite 12, and these particles can be interconnected and adhere to the tubular body 11 of the heat storage unit 2, so that the zeolite 12 and the tubular body 11 can be brought into close contact with each other. Higher heat transfer can be obtained between them. Examples of the additive include a dispersant, a viscosity modifier, and the like, and known ones can be used. Next, the inner tube 19 is inserted along the long axis direction of the tubular body 11, and a diffusion layer is formed in a gap formed between the outer surface of the inner tube 19 and the inner peripheral surface of the zeolite 12. A material (for example, a powdery metal material) that becomes the wick structure 17 of 1 is filled. Next, a material that becomes the first lid 15 on one end side of the zeolite 12 (for example, a powdery metal material), and a material that becomes the second lid 16 on the other end side of the zeolite 12 (for example, a powdery metal material). For example, powdered metal material) is filled in each. After filling each of the above materials, heat treatment is performed so that the inner side surface portion becomes the first wick structure 17, one end portion becomes the first lid body, and the other end portion becomes the second lid body. , The heat storage unit 2 having the covered zeolite 12 can be manufactured.

If necessary, the heat storage unit 2 manufactured as described above may be further flattened to form a flat heat storage unit.

When the first wick structure 17 is formed of a metal mesh or the like, for example, a core rod is inserted into the tubular body 11, and a metal mesh or the like is arranged and fixed on the outer peripheral surface of the core rod, and the first wick structure 17 is formed. Wick structure 17 is formed. After that, the heat storage portion 2 may be manufactured by filling and arranging the zeolite 12 in the gap portion formed between the inner surface of the tubular body 11 and the outer surface of the first wick structure 17.

Further, as a method of providing the diffusion layer (first wick structure 17) on the surface of the zeolite 12, for example, the following method can be adopted. First, the zeolite 12 is formed into a shape having holes having a plurality of openings communicating with each other, and a core rod having a shape corresponding to the path of the holes is formed from the openings to the zeolite 12 formed. To insert. Next, a material (for example, a powdery metal material) to be a diffusion layer (first wick structure 17) is inserted between the outer surface of the core rod and the inner surface of the hole, and the material is heated or Sinter. Then, by pulling out the core rod, a diffusion layer can be provided on the surface of the zeolite 12.

Next, the heat storage device of the present invention will be described with reference to the drawings. Here, a heat storage device using the heat storage unit 2 according to the second embodiment will be described as an example.

As shown in FIG. 3, in the heat storage device 100 according to the first embodiment of the present invention, the open end 13 of the tubular body 11 of the heat storage unit 2 is interposed via the first piping system 102. The liquid phase heat transport fluid L that functions as an adsorbed object (reaction medium) is connected to the reaction medium storage unit 101 in which the heat transport fluid L is stored. The first piping system 102 includes a first valve 103 that is a means for supplying the liquid phase heat transport fluid L. As described above, the liquid phase heat transport fluid L functions as an adsorbed substance that contributes to heat storage and heat generation of the zeolite 12, and also functions as a heat transport medium by changing the phase from the liquid phase to the gas phase. By opening the first valve 103, the heat transport fluid L of the liquid phase flows from the reaction medium storage unit 101 through the open end 13 of the tubular body 11 into the heat storage unit 2, that is, the first valve 103. It flows into the wick structure 17 of 1 and the inside of the inner pipe 19 (that is, the flow path 28). The number of heat storage units 2 installed in the heat storage device 100 is not limited to one, and a plurality of heat storage units 2 may be incorporated in a header unit (not shown) and connected in parallel.

The liquid phase heat transport fluid L flowing into the first wick structure 17 is adsorbed by the zeolite 12, and the heat H is released. On the other hand, the heat released while the liquid phase heat transport fluid L flowing into the flow path 28 of the heat storage unit 2 moves the flow path 28 from one end 13 side to the other end 14 side. It receives heat from H and vaporizes it to become the heat transport fluid G in the gas phase. The heat transport fluid G of the gas phase vaporized in the flow path 28 is discharged as a heat transport fluid from the other end portion 14 of the tubular body 11 opened, that is, from the heat storage portion 2 to the second piping system 104. Will be done.

As shown in FIG. 3, in the first piping system 102, a partition wall 105 which is a porous body is arranged between the first valve 103 and the heat storage unit 2 as a backflow suppressing member. The partition wall 105 separates the first piping system 102 into a heat storage unit 2 side and a reaction medium storage unit 101 side. The porous body, which is the material of the partition wall 105, has through holes having dimensions that allow the heat transport fluid L of the liquid phase to pass through. Therefore, when the first valve 103 is opened, the porous body forming the partition wall 105 is impregnated with the heat transport fluid L of the liquid phase, and the heat transport fluid L of the liquid phase is the reaction medium storage unit. It is supplied from 101 through the partition wall 105 to the heat storage unit 2. Further, the partition wall 105, which is a porous body, functions as a member for preventing the backflow of the heat transport fluid G in the gas phase to the first piping system 102 side.

The size (average diameter) of each through hole of the porous body forming the partition wall 105 is not particularly limited as long as it has the above-mentioned function. For example, the diameter when the through hole is converted into a circle in a predetermined cross section. It is less than 50 micrometers. The material of the porous body is not particularly limited, and examples thereof include the same materials as the first lid body 15 and the second lid body 16. Specifically, for example, a metal powder such as copper powder. Examples thereof include a sintered body, a metal mesh, a foamed metal, a metal foil provided with a through hole, and a metal plate provided with a through hole.

Further, the backflow suppressing member is not limited to the partition wall 105 which is a porous body as long as it is a member capable of preventing the backflow of the heat transport fluid G of the gas phase in the flow path 28, and has, for example, one hole. It may be a member, a rectifying plate, or the like, or it may be a valve.

As shown in FIG. 3, the other open end 14 of the tubular body 11 of the heat storage unit 2 is connected to the heat exchange unit 106 (for example, a condenser) via the second piping system 104. The gas phase heat transport fluid G discharged from the other end 14 of the tubular body 11 to the second piping system 104 moves in the second piping system 104 in the direction of the heat exchange section 106. It is introduced into the heat exchange unit 106. The heat exchange unit 106 changes the phase of the gas phase heat transport fluid G introduced from the second piping system 104 into a liquid phase by, for example, cooling.

The gas phase heat transport fluid G introduced into the heat exchange unit 106 is condensed and phase-changed into a liquid phase to become a liquid phase heat transport fluid L and release latent heat. The latent heat released by the heat exchange unit 106 is transported to a heat utilization destination (not shown) thermally connected to the heat exchange unit 106. As described above, in the heat storage device 100, the medium adsorbed on the zeolite 12 (that is, the object to be adsorbed) is also used as a heat transport fluid for transporting the heat released from the zeolite 12 to the heat exchange unit 106.

Further, the heat storage device 100 includes a third piping system 107 that connects the heat exchange unit 106 and the reaction medium storage unit 101. The heat transport fluid L of the liquid phase whose phase has changed from the gas phase in the heat exchange unit 106 is returned to the reaction medium storage unit 101 via the third piping system 107. Further, the third piping system 107 is provided with a second valve 108 which is a means for supplying the heat transport fluid L of the liquid phase.

Therefore, in the heat storage device 100, the reaction medium storage unit 101 to the heat storage unit 2 and the heat storage unit 2 to the heat exchange unit are provided by the first piping system 102, the second piping system 104, and the third piping system 107, respectively. A circulation system is formed in which the heat transport fluid, which is the working fluid, circulates from the heat exchange unit 106 to the reaction medium storage unit 101. The circulatory system is airtight and degassed. That is, the circulatory system has a loop-shaped heat pipe structure.

Further, as shown in FIG. 3, the pressure adjusting unit 110 is provided in the third piping system 107 of the heat storage device 100. The pressure adjusting unit 110 has a function of making the pressure different between the heat storage unit 2 side and the reaction medium storage unit 101 side in the third piping system 107. When the zeolite 12 dissipates heat, the pressure on the heat storage section 2 side of the pressure adjusting section 110 is reduced, so that the flow and circulation of the heat transport fluid in the second piping system 104 and the third piping system 107 are promoted. That is, when the pressure adjusting unit 110 operates, the heat transport fluid G (subject to be adsorbed in the gas phase) of the gas phase is smoothly guided to the heat exchange unit 106, and the heat transport fluid G of the gas phase flows and circulates. It is possible to prevent a decrease in heat storage / heat dissipation efficiency and a decrease in heat transport efficiency due to the inhibition.

Further, since the pressure adjusting unit 110 depressurizes the inside of the heat storage unit 2, the desorption of the adsorbed substance from the zeolite 12 is promoted, so that the heat storage temperature of the zeolite 12 can be reduced and the heat storage time of the zeolite 12 is shortened. can do. Further, the pressure adjusting unit 110 depressurizes the inside of the heat storage unit 2, so that when the heat storage device 100 is started, the heat transport fluid of the liquid phase is smoothly transferred from the reaction medium storage unit 101 to the zeolite 12 housed in the heat storage unit 2. L can be supplied. As a result, the heat storage device 100 can be started quickly.

Further, the pressure adjusting unit 110 can smoothly recover the excess gas phase heat transport fluid G remaining in the heat storage unit 2 to the reaction medium storage unit 101. Further, since the pressure adjusting unit 110 is provided in the third piping system 107 connecting the heat exchange unit 106 and the reaction medium storage unit 101, unnecessary heat dissipation between the heat storage unit 2 and the heat exchange unit 106 is provided. Therefore, the heat transport efficiency of the heat storage device 100 is further improved.

Examples of the pressure adjusting unit 110 include a pump, a compressor, and the like.

The pressure adjusting action of the pressure adjusting unit 110, the capillary force of the first wick structure 17, and the temperature difference between the inside of the heat storage unit 2 which is relatively high temperature and the inside of the heat exchange unit 106 which is relatively low temperature. Due to the vapor pressure difference of the heat transport fluid between the inside of the heat storage unit 2 and the inside of the heat exchange unit 106, the heat transport fluid smoothly circulates in the circulation system of the heat storage device 100.

Next, an example of the heat storage system of the heat storage device of the present invention will be described using the components of the heat storage device 100 of FIG. When the heat storage unit 2 stores heat, the heat storage unit 2 receives heat from the external environment with the first valve 103 of the heat storage device 100 closed and the second valve 108 open. When the heat storage unit 2 receives heat from the external environment, the zeolite 12 releases the adsorbed substance in the gas phase. At this time, by operating the pressure adjusting unit 110 to reduce the pressure inside the heat storage unit 2, the release of the gas phase adsorbed substance from the zeolite 12 (that is, the heat storage action of the zeolite 12) is promoted. The vapor-phase adsorbed material released from the zeolite 12 smoothly moves to the second piping system 104 and the heat exchange unit 106 (in the heat exchange unit 106, the adsorbed material changes phase from the gas phase to the liquid phase). To circulate. Then, as an object to be adsorbed in the liquid phase (that is, the heat transport fluid L in the liquid phase), it is transported and stored from the heat exchange unit 106 to the reaction medium storage unit 101 via the third piping system 107.

The first valve 103 may be closed when the heat storage unit 2 reaches a predetermined heat dissipation temperature. Further, for example, when a predetermined time elapses from the start of heat release of the zeolite 12 (or the opening of the first valve 103) after the heat release operation of the heat storage unit 2, the heat transport fluid L of the liquid phase is stored in the reaction medium. The timing of closing the first valve 103 may be determined from the time when a predetermined amount is returned to the unit 101 or when the heat dissipation amount of the heat exchange unit 106 reaches a predetermined value.

The temperature change of the heat storage unit 2 is measured by a sensor or the like (not shown), and when it is determined that the heat storage is completed, the operation of the pressure adjusting unit 110 is stopped, and not only the first valve 103 but also the second valve 108 is also closed, and the heat transport fluid (reaction medium) L of the liquid phase is confined in the reaction medium storage unit 101.

The second valve 108 may be closed according to the amount of heat transport fluid L stored in the liquid phase in the reaction medium storage unit 101. The amount of heat transport fluid L stored in the liquid phase may be measured by measuring the volume in the reaction medium storage section 101, such as the heat dissipation time and amount of heat radiation of the zeolite 12, the weight of the reaction medium storage section 101, and the heat exchange section 106. It may be determined from the amount of heat radiated, the amount of heat transport fluid L discharged from the liquid phase from the heat exchange unit 106, and the like.

On the other hand, when transporting the heat stored in the heat storage unit 2 from the heat storage unit 2 to the heat exchange unit 106 (starting the heat storage device 100), the first valve 103 of the heat storage device 100 is opened to liquid the fluid. The phase heat transport fluid L is supplied from the reaction medium storage unit 101 to the heat storage unit 2. Further, the second valve 108 is also opened to open the circulation system of the heat storage device 100, whereby the heat storage device 100 is operated. At this time, by operating the pressure adjusting unit 110 prior to opening the first valve 103, the heat transport fluid L of the liquid phase can be smoothly supplied from the reaction medium storage unit 101 to the heat storage unit 2. Further, by continuously operating the pressure adjusting unit 110 even after the opening of the second valve 108, the heat transport fluid G of the gas phase can be smoothly and quickly transported from the heat storage unit 2 to the heat exchanger 106, and the heat storage device can be operated. The heat transport efficiency of 100 is improved.

Next, the heat storage device according to the second embodiment of the present invention will be described with reference to the drawings. The same components as the heat storage device according to the first embodiment will be described with reference to the same reference numerals.

In the heat storage device according to the first embodiment, the pressure adjusting unit 110 is arranged in the third piping system 107 that connects the heat exchange unit 106 and the reaction medium storage unit 101, but instead of this, FIG. 4 As shown in the above, in the heat storage device 200 according to the second embodiment, the pressure adjusting unit 110 is arranged in the second piping system 104 that connects the heat storage unit 2 and the heat exchange unit 106.

In the heat storage device 200 as well, the operation of the pressure adjusting unit 110 promotes the circulation and circulation of the gas phase heat transport fluid G in the circulation system of the heat storage device 200. Therefore, even in the heat storage device 200, it is possible to prevent a decrease in heat storage / heat dissipation efficiency and a decrease in heat transfer efficiency due to obstruction of the flow and circulation of the heat transport fluid G in the gas phase. Further, also in the heat storage device 200, since the pressure adjusting unit 110 depressurizes the inside of the heat storage unit 2 promotes the desorption of the adsorbed substance from the zeolite 12, the heat storage temperature of the zeolite 12 can be reduced, and the zeolite 12 can also be reduced. The heat storage action can be smoothed. Further, the pressure adjusting unit 110 depressurizes the inside of the heat storage unit 2, so that when the heat storage device 100 is started, the liquid phase heat transport fluid L is smoothly transferred from the reaction medium storage unit 101 to the zeolite 12 housed in the heat storage unit 2. Can be supplied.

Next, an example of a warm-up device using the heat storage device of the present invention will be described. For example, by mounting the heat storage unit of the heat storage device on the exhaust pipe connected to the internal combustion engine (engine or the like) mounted on the vehicle, the heat of the exhaust gas flowing in the exhaust pipe can be stored in the heat storage unit. By arranging the heat storage unit so that at least a part of the outer surface of the tubular body of the heat storage unit is in direct contact with the exhaust gas flowing in the exhaust pipe, the heat storage unit can be thermally connected to the heat source.

The heat derived from the exhaust gas stored in the heat storage section is transported from the heat storage section to the heat exchange section in the circulation system of the heat storage device, and further transported from the heat exchange section to the warm-up device of the internal combustion engine which is the heat utilization destination. To.

Next, another embodiment of the present invention will be described. In the heat storage unit according to the second embodiment, the first wick structure is a member such as a metal sintered body or a metal mesh constructed by firing a powdered metal material, but instead of this. Alternatively, it may be a groove having a capillary force formed on the outer surface of the inner tube.

In the heat storage device of each of the above embodiments, the case where zeolite is used as the heat storage material has been described, but the present invention is not limited to this, and heat is released by reacting with a liquid reaction medium (for example, water) such as CaO and MgO. A chemical heat storage material may be used.

Further, in the heat storage section of each of the above embodiments, the first wick structure is a member such as a metal sintered body or a metal mesh constructed by firing a powdered metal material. Alternatively, a groove having a capillary force formed on the inner surface of the tubular body may be used. Further, a second wick structure having a capillary structure may be provided on the inner surface of the inner tube.

In the heat storage portion of each of the above embodiments, the radial cross section of the tubular body is circular, but the shape of the cross section is not particularly limited. For example, in addition to the flat shape described above, an elliptical shape or a triangular shape is formed. It may be a polygonal shape such as a square shape, an ellipse shape, a rounded rectangle, or the like. Further, in the heat storage section of each of the above embodiments, the first lid and the second lid are porous, but instead, a wick structure having a capillary structure may be used.

In the heat storage unit according to each of the above embodiments, the first lid having a hole is used, but instead of this, the first lid having no hole may be used. In this case, the length of the inner tube is appropriately made shorter than the length of the inner tube of the heat storage portion so that the first lid having no pores can be made into one end of the zeolite tubular body. It can be arranged adjacent to the part side.

Further, in the heat storage unit of each of the above-described embodiments, the number of installations of the first wick structure is one, but the number of installations is not particularly limited, and a plurality of first wick structures may be installed depending on the usage situation. .. Further, in the heat storage unit of each of the above-described embodiments, the number of flow paths provided inside the first wick structure is one, but the number of installations is not particularly limited and is used. A plurality may be provided according to the above. Further, in the heat storage section of each of the above-described embodiments, a wick structure is used as the diffusion layer, but instead of this, the pore structure of zeolite may be used.

The method of using the heat storage device of the present invention is not particularly limited to the warming device of the internal combustion engine mounted on the vehicle, and may be used, for example, for the heating device in the vehicle. It may be used for recovery, storage and utilization of waste heat from a plant. Further, as another heat utilization destination of the heat storage device of the present invention, for example, an indoor heater, a water heater, a dryer and the like can be mentioned.

In the heat storage device according to each embodiment of the present invention, the heat storage unit according to the second embodiment is used, but instead of this, the heat storage unit according to another embodiment may be used.

The heat storage device of the present invention can be used in a wide range of fields because it can prevent a decrease in heat storage / heat dissipation efficiency and a decrease in heat transport efficiency by adjusting the pressure of the working fluid of the gas phase in the system, for example. , High utility value in the field of collecting, storing and using exhaust heat by mounting it on a vehicle.

1, 2 Heat storage unit 12 Zeolite 100, 200 Heat storage device 101 Reaction medium storage unit 106 Heat exchange unit

Claims (4)

The heat storage unit containing the heat storage material, the reaction medium storage unit connected to the heat storage unit via the first piping system and storing the reaction medium that reacts with the heat storage material, the heat storage unit and the second It has a heat exchange unit which is connected via the piping system of the above and is connected to the reaction medium storage unit and the third piping system.
Before SL pressure regulator is provided in the third piping system, the pressure adjusting portion is a said heat storage portion is a decompression means for decompressing the heat storage device,
The reaction medium storage section to the heat storage section, the heat storage section to the heat exchange section, and the heat exchange section to the reaction by the first piping system, the second piping system, and the third piping system. A heat storage device in which a circulation system capable of circulating fluid is formed in the medium storage section. Diffusion provided between the tubular body, the heat storage material housed in the tubular body, a flow path penetrating the tubular body in the longitudinal direction, and the heat storage material and the flow path. heat storage device according to claim 1 having a layer, the. With the heat storage unit
A reaction medium storage portion containing the reaction medium in a liquid phase, which is connected to one end of the tubular body via the first piping system.
The heat exchange section connected to the other end of the tubular body via the second piping system, and connected to the reaction medium storage section and the heat exchange section via the third piping system.
Has a circulatory system,
The heat storage device according to claim 2 , wherein the circulatory system is in an airtight state and is degassed. The heat storage unit containing the heat storage material, the reaction medium storage unit connected to the heat storage unit via the first piping system and storing the reaction medium that reacts with the heat storage material, the heat storage unit and the second is connected via a piping system, and has a heat exchange unit connected through the reaction medium reservoir and the third piping system, the pressure adjustment portion is provided in front Symbol third piping system The pressure adjusting unit is a heat storage system using a heat storage device which is a decompression means for depressurizing the inside of the heat storage unit.
The reaction medium storage unit to the heat storage unit, the heat storage unit to the heat exchange unit, and the heat exchange unit to the reaction by the first piping system, the second piping system, and the third piping system. A circulation system in which fluid can be circulated is formed in the medium storage section.
The pressure adjusting unit operates at the timing when the reaction medium is supplied to the heat storage unit, the timing when the heat storage unit stores heat, and / or the timing when heat is released from the heat storage unit.
At the time of heat storage of the heat storage unit, the first valve provided in the first piping system is closed, and the second valve provided in the third piping system is opened in the heat storage unit. Heat is received from the external environment, the pressure adjusting unit is operated to reduce the pressure inside the heat storage unit, and the pressure is reduced.
When transporting the heat stored in the heat storage unit from the heat storage unit to the heat exchange unit, the first valve is opened to supply the reaction medium from the reaction medium storage unit to the heat storage unit. A heat storage system in which the heat storage device is operated by opening the second valve to open the circulation system, and the pressure adjusting unit is operated prior to the opening of the first valve .

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