JP2018165580A - Heat storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat storage device capable of preventing a decrease in heat storage/radiation efficiency and a decrease in heat transport efficiency by preventing a pressure rise of a vapor-phase working fluid in a system. SOLUTION: A heat storage part in which a heat storage material is accommodated, a reaction medium storage part in which a reaction medium that reacts with the heat storage material is connected, which is connected to the heat storage part via a first piping system, and the heat storage And a heat exchange part connected to the reaction medium storage part via a third piping system, and the second piping system or the third piping system. Accumulator with a pressure adjustment unit installed in the pipe system. [Selection diagram]

Description

  In the present invention, a heat storage material (for example, a chemical heat storage material or zeolite) reacts with a reaction medium (for example, water) to release heat, stores the heat, and the reaction medium is desorbed (hereinafter referred to as “endothermic”). It is related with the heat storage apparatus which can repeat heat_generation | fever and heat storage using an effect | action.

  2. Description of the Related Art In recent years, heat storage devices that store and use waste heat in industrial plants and the like and store and use waste heat obtained from automobile engines and exhaust have been studied.

  Therefore, as shown in FIG. 5, a chemical heat storage material composite containing a powdered chemical heat storage material 62 and a foam expansion material 63 disposed adjacent to the chemical heat storage material 62 includes an inner tube 61 and an outer tube 67. The reaction flow path 64 in which water vapor as a reactant / reaction product accompanying heat storage / radiation of the chemical heat storage material 62 flows is configured in the inner pipe 61 and between the chemical heat storage material 62. There has been proposed a heat storage container 6 in which a heat exchange channel 66 through which a gaseous fluid that is a heat exchange medium for performing heat exchange circulates is provided between an outer tube 67 and an outer wall 65 (Patent Document 1). .

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

  However, when supplying water 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 gas-phase working fluid in the heat storage container 11 Distribution may be hindered. There is a problem in that the heat storage / heat radiation efficiency of the heat storage container 11 and the heat transport efficiency of the heat exchange medium may be reduced due to the inhibition of the flow of the gas-phase working fluid. In addition, when the heat storage device receives heat and stores heat, if the pressure in the device is high, the reaction medium does not detach from the heat storage material, and the heat storage temperature rises, or the time until the heat storage is completed becomes long. There was a problem.

JP 2009-228952 A International Publication No. 2016/121778

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

  Aspects of the present invention include a heat storage section in which a heat storage material is accommodated, a reaction medium storage section in which a reaction medium that reacts with the heat storage material and connected to the heat storage section and the first piping system is stored, A heat exchanger connected to the heat storage unit via a second piping system, and connected to the reaction medium storage unit via a third piping system, and the second piping system or the This is a heat storage device in which a pressure adjusting unit is provided in the third piping system.

  In the above aspect, the first piping system, the second piping system, and the third piping system, respectively, from the reaction medium storage unit to the heat storage unit, from the heat storage unit to the heat exchange unit, and from the heat exchange unit to the reaction medium storage unit. A circulation system through which fluid circulates is formed.

  An aspect of the present invention is the 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 unit that decompresses the heat storage unit.

  According to an aspect of the present invention, the heat storage section includes a tubular body, the heat storage material accommodated in the tubular body, a flow path penetrating the tubular body in a major axis direction, the heat storage material, and the flow path. And a diffusion layer provided therebetween.

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

  Aspects of the present invention include a heat storage section in which a heat storage material is accommodated, a reaction medium storage section in which a reaction medium that reacts with the heat storage material and connected to the heat storage section and the first piping system is stored, A heat exchanger connected to the heat storage unit via a second piping system, and connected to the reaction medium storage unit via a third piping system, and the second piping system or the A heat storage system using a heat storage device in which a pressure adjustment unit is provided in a third piping system, the timing at which the reaction medium is supplied to the heat storage unit, the timing at which the heat storage unit stores heat, and / or the heat storage. This is a heat storage system in which the pressure adjusting unit operates at a 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 that connects the heat storage unit and the heat exchange unit or the third piping system that connects the heat exchange unit and the reaction medium storage unit. In addition, it is possible to prevent an increase in the pressure of the gas-phase working fluid in the circulation system of the heat storage device. Therefore, since the circulation of the gas-phase working fluid 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, by providing the pressure adjustment unit in the second piping system or the third piping system, the excess reaction medium remaining in the heat storage unit is smoothly transported to the reaction medium storage unit, Can be recovered.

  According to the aspect of the present invention, unnecessary pressure radiation between the heat storage unit and the heat exchange unit is provided by providing the pressure adjustment unit in the third piping system that connects the heat exchange unit and the reaction medium storage unit. Therefore, heat transport efficiency is further improved.

  According to the aspect of the present invention, since the pressure adjusting unit is a decompression unit that depressurizes 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 The heat storage of the material can be smoothed. Further, since the pressure adjusting unit is a decompression unit that depressurizes the inside of the heat storage unit, the reaction medium can be smoothly supplied from the reaction medium storage unit to the heat storage material of the heat storage unit when the heat storage device is activated.

(A) The figure is side surface sectional drawing of the thermal storage part which concerns on 1st Embodiment, (b) A figure is A-A 'sectional drawing of the thermal storage part in Fig.1 (a). (A) is a side sectional view of a heat storage unit according to the second embodiment, and (b) is a B-B ′ sectional view of the heat storage unit in FIG. 2 (a). It is explanatory drawing of the thermal storage apparatus which concerns on the example of 1st Embodiment of this invention. It is explanatory drawing of the thermal storage apparatus which concerns on the 2nd Example of this invention. It is explanatory drawing of the conventional heat storage apparatus.

  Below, the thermal storage apparatus which concerns on the example of embodiment of this invention is demonstrated. As shown in FIG. 3, the heat storage device 100 according to the first embodiment of the present invention is connected via a heat storage unit 2 in which zeolite 12 is accommodated as a heat storage material, and the heat storage unit 2 and the first piping system 102. The reaction medium storage unit 101 storing the adsorbed object adsorbed on the zeolite 12 (also referred to as “reaction medium”), the heat storage unit 2 and the second piping system 104 are connected and reacted. A medium storage unit 101 and a heat exchange unit 106 connected via a third piping system 107. Accordingly, in the heat storage device 100, the first piping system 102, the second piping system 104, and the third piping system 107 are respectively changed from the reaction medium storage unit 101 to the heat storage unit 2 and from the heat storage unit 2 to the heat exchange unit 106. In addition, a circulation system capable of circulating a 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 adjustment unit 110.

  In describing the heat storage device according to the above-described embodiment of the present invention, 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 to Fig.1 (a), the thermal storage part 1 which concerns on 1st Embodiment has the cylindrical body 11 which is the tubular body which the both ends opened, and the zeolite 12 arrange | positioned inside the cylindrical body 11. As shown in FIG. I have. The heat storage unit 1 includes a first lid 15 made of a porous body disposed adjacent to one end 13 of the cylindrical body 11 of the zeolite 12, and the other of the cylindrical bodies 11 of the zeolite 12. Adjacent to the inner side surface of the zeolite 12 between the first lid body 15 and the second lid body 16, which is made of a porous body disposed adjacent to the end 14 side of the first lid body 15. The 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 cylindrical body 11 is circular shape. Moreover, the zeolite 12 is the aspect by which the powder was shape | molded by the cylinder shape, and the cross section of radial direction is circular shape. The central axis of the cylindrical body 11 and the central axis of the zeolite 12 that is cylindrical are arranged coaxially.

  Each of the first lid 15 and the second lid 16 has a circular shape in which a hole is formed in the center, and the wall surface of the hole 15 ′ of the first lid 15 and the second lid The wall surface of the hole 16 ′ of the body 16 is a part of the wall surface of the flow path 18 described later, and forms the end of the flow path 18. Accordingly, the holes 15 ′ and 16 ′ have shapes and dimensions corresponding to the shapes and dimensions of the radial cross section of the flow path 18.

  As shown to FIG. 1 (a), (b), in the thermal storage part 1, the 1st cover body 15, the 2nd cover body 16, the 1st wick structure 17, and the cylindrical body 11 inner surface are respectively It is in direct contact with the opposing zeolite 12 site. 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 cylindrical body 11 covers the outer side surface of the zeolite 12. The first lid body 15 and the second lid body 16 are accommodated inside the cylindrical body 11 with respect to the one end 13 and the other end 14, respectively. 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. . Specifically, one end portion of the first wick structure 17 is in contact with the first lid body 15 having a hole portion 15 ′ that forms one end portion of the channel 18 that is open, The other end of one wick structure 17 is in contact with a second lid 16 having a hole 16 ′ that forms the other end of the channel 18 that is open. Therefore, in the heat storage unit 1, the zeolite 12 is coated in a state of being in contact with the first lid 15, the second lid 16, the first wick structure 17, and the inner surface of the cylindrical body 11.

  In the heat storage part 1, the shape of the 1st wick structure 17 is a cylinder shape, and the cross section of radial direction is circular shape. That is, a space that penetrates the cylindrical body 11 in the major axis direction, that is, the flow path 18 is provided inside the first wick structure 17. 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 coated in contact with the inner surface of the first lid 15, the second lid 16, the first wick structure 17, and the cylindrical body 11, the zeolite 12 is liquid as an adsorbed material of the zeolite 12. Even if is used, the shape of the molded zeolite 12 can be maintained. Accordingly, the first wick structure 17 also functions as a holding member having the shape of the zeolite 12. A part of the liquid phase heat transport fluid (reaction medium) L, which is a 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 liquid phase heat transport fluid L 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 liquid-phase heat transport fluid L is along the longitudinal direction of the first wick structure 17, that is, along the long axis direction of the cylindrical body 11. The zeolite 12 is smoothly and reliably diffused from one end 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 quickly adsorbed by the zeolite 12. Thus, 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 liquid-phase heat transport fluid L supplied from one end of the flow path 18. As a result, the liquid-phase heat transport fluid L changes from the liquid phase to the gas phase while moving in the flow path 18 from one end to the other end. The heat transport fluid vaporized in the flow path 18 (that is, the gas phase heat transport fluid G) is discharged from the other end of the flow path 18 to the outside of the heat storage section 1 and further transports the heat H to the heat exchange section. To do. In this way, the flow path 18 functions as a passage for the gas phase heat transport fluid G. 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 cylindrical body 11.

  Thus, the liquid-phase heat transport fluid L functions as an adsorbed substance that contributes to the heat absorption and heat generation of the zeolite 12 in the reaction medium of the heat storage material, the heat storage section 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 unit. Therefore, it is not necessary to make the path of the object to be adsorbed and the path of the heat transport fluid different from each other, and the structure of the piping path can be simplified. Moreover, since the adsorbate in the liquid phase rather than the gas phase is adsorbed on the zeolite, an excellent heat storage density can be obtained.

  As the zeolite 12, for example, one 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 for the heat storage unit 1, heat can be stored in the heat storage unit 1 even when the environmental temperature at which the heat storage unit 1 is disposed is 350 ° C. or less. Therefore, the freedom degree of selection of the installation place of the thermal storage part 1 improves compared with the thermal storage apparatus which uses chemical thermal storage materials, such as calcium oxide.

The zeolite 12 stored in the heat storage unit 1 is represented by the following general formula (1)
_{Me 2 / x O · Al 2} O 3 · mSiO 2 · nH 2 O (1)
(In the formula, Me is a cation, x is a valence of Me, m is 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, silica-alumina ratio) in the general formula (1) is not particularly limited. From the point of obtaining heat storage density, 2.0 or more and less than 5.0 (that is, hydrophilic zeolite) is preferable.

  The first lid body 15 and the second lid body 16 are porous bodies having through-holes with dimensions that allow passage of the liquid-phase heat transport fluid L but not zeolite 12. The dimension (average diameter) of the through-hole of a porous body will not be specifically limited if it is a dimension which has the said function, For example, it is 50 micrometers or less. Moreover, the material of the 1st cover body 15 and the 2nd cover body 16 is not specifically limited, For example, the metal foil which provided the sintered compact of metal powders, such as copper powder, a metal mesh, a foam metal, and a through-hole And a metal plate provided with through holes.

  The first wick structure 17 is not particularly limited as long as it has a capillary structure, and examples thereof include members such as a metal sintered body and a metal mesh constructed by firing a powdered metal material. Can do. Moreover, the 1st wick structure 17 may be a different body from the 1st cover body 15 and the 2nd cover body 16, like the thermal storage part 1, and as the 1st wick structure body 17, copper powder etc. When using a sintered body of metal powder or a metal mesh, the first lid 15 and the second lid 16 may be integrated.

  The material of the cylindrical body 11 is not specifically limited, For example, copper, aluminum, stainless steel etc. can be mentioned. Examples of the liquid-phase heat transport fluid (reaction medium) L include water, alcohol such as ethanol, a mixture of water and alcohol, and the like.

  Next, the heat storage unit according to the second embodiment will be described with reference to the drawings. In addition, about the same component as the thermal storage part which concerns on 1st Embodiment, it demonstrates using the same code | symbol. As shown in FIGS. 2 (a) and 2 (b), in the heat storage unit 2 according to the second embodiment, the shape of the long axis is cylindrical, and the cross section in the radial direction is circular. An inner tube 19, which is a tube material having both ends opened, 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 tube 19 is a wall surface of the flow path 28. Further, the inner pipe 19 is thermally connected to the first wick structure 17 by contacting the inner peripheral surface of the first wick structure 17 and the outer face of the inner pipe 19.

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

  In the heat storage section 2 according to the second embodiment, the heat H received by the first wick structure 17 is supplied from one end of the flow path 28 via the inner pipe 19. To the liquid phase heat transport fluid L. 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. Furthermore, since the inner tube 19 can prevent the shape of the first wick structure 17 from changing, the shape of the flow path 28 can be reliably maintained.

  The material of the inner tube 19 is not particularly limited, and examples thereof include copper, aluminum, and stainless steel. In addition, the heat storage part 2 which concerns on 2nd Embodiment is a heat storage part used for the heat storage apparatus which concerns on the above-mentioned 1st Embodiment of this invention.

  Next, the operation of the heat storage unit according to each embodiment described above will be described. Here, the heat storage unit 1 according to the first embodiment will be described as an example. For example, when the heat storage unit 1 is installed close to a fluid (for example, exhaust gas) that is a heat recovery target, the outer surface of the cylindrical 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 cylindrical body 11 is transferred to the thermally connected zeolite 12 by contacting the inner surface of the cylindrical body 11. When the zeolite 12 receives the heat, the zeolite 12 releases the adsorbed material as a gas.

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

  The heat H released from the zeolite 12 is transmitted 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 changes from the liquid phase to the gas phase. . The gas phase heat transport fluid G that has undergone a phase change from the liquid phase in the flow path 18 is transported from the heat storage section 1 to the heat exchange section as a heat medium that transports the heat H, that is, a heat transport fluid.

  Note that the heat storage unit 1 may include heat exchange means such as fins on the outer surface of the cylindrical body 11 in order to improve the efficiency of heat recovery from the fluid that is the target of heat recovery.

  Next, the example of a manufacturing method of the thermal storage part used with the thermal storage apparatus of this invention is demonstrated. Here, the heat storage unit 2 according to the second embodiment will be described as an example. Although the manufacturing method of the heat storage part 2 is not specifically limited, For example, the zeolite 12 is first inserted into the cylinder shape along the inner surface of the cylinder body 11 in the major axis direction of the cylinder body 11. At this time, if necessary, the slurry containing the zeolite 12 may contain a binder, an additive, or the like in addition to the zeolite 12 particles. Examples of the binder include clay-based minerals (such as sepiolite and talc), organic binders such as vinyl alcohol and (meth) acrylic, and inorganic binders such as alumina sol. When the binder is used, it can remain together with the particles of the zeolite 12 and can be solidified. The particles can be connected to each other and can be in close contact with the cylindrical body 11 of the heat storage section 2. In the meantime, higher heat transfer properties can be obtained. Examples of the additive include a dispersant and a viscosity modifier, and known ones can be used. Next, the inner tube 19 is inserted along the long axis direction of the cylindrical 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 powdered metal material) that becomes one wick structure 17 is filled. Next, a material that becomes the first lid 15 on one end side of the zeolite 12 (for example, a powdered metal material), and a material that becomes the second lid 16 on the other end side of the zeolite 12 ( For example, powder metal materials) are respectively filled. After filling each material, heat treatment is performed, and the inner side surface is the first wick structure 17, one end is the first lid, and the other end is the second lid. The heat storage part 2 having the covered zeolite 12 can be manufactured.

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

  In the case where the first wick structure 17 is formed of a metal mesh or the like, for example, a core rod is inserted into the cylindrical body 11 and the metal mesh or the like is disposed and fixed on the outer peripheral surface of the core rod. The wick structure 17 is formed. Then, the heat storage part 2 may be manufactured by filling and arranging the zeolite 12 in the gap formed between the inner surface of the cylindrical 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 used. First, the zeolite 12 is formed into a shape having a hole having a plurality of openings communicating with each other, and the core rod having a shape corresponding to the path of the hole is formed from the opening to the zeolite 12 formed. Insert. Next, a material (for example, a powdered metal material) that becomes 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, a diffusion layer can be provided on the surface of the zeolite 12 by pulling out the core rod.

  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, one end portion 13 of the cylindrical body 11 of the heat storage unit 2 that is opened is provided via the first piping system 102. It is connected to a reaction medium storage unit 101 in which a liquid heat transport fluid L that functions as an adsorbent (reaction medium) is stored. The first piping system 102 includes a first valve 103 which is a supply unit for 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 liquid-phase heat transport fluid L is transferred from the reaction medium reservoir 101 to the inside of the heat accumulator 2, that is, through the one end 13 opened of the cylindrical body 11. 1 wick structure 17 and the inside of the inner tube 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 heat H is released. On the other hand, the heat transported fluid L in the liquid phase that has flowed into the flow path 28 of the heat storage section 2 moves while moving the flow path 28 from the one end 13 side to the other end 14 side. H is received and vaporized to become a gas phase heat transport fluid G. The vapor-phase heat transport fluid G vaporized in the flow path 28 is discharged as the heat transport fluid from the other open end 14 of the cylindrical body 11, that is, from the heat storage section 2 to the second piping system 104. Is done.

  As shown in FIG. 3, in the first piping system 102, a partition wall 105 that is a porous body is disposed as a backflow suppressing member between the first valve 103 and the heat storage unit 2. By the partition wall 105, the first piping system 102 is separated into the heat storage unit 2 side and the reaction medium storage unit 101 side. The porous body, which is the material of the partition wall 105, has a through-hole having a dimension that allows the liquid-phase heat transport fluid L to pass therethrough. Therefore, when the first valve 103 is opened, the porous body forming the partition wall 105 is impregnated with the liquid heat transport fluid L, and the liquid heat transport fluid L is contained in the reaction medium reservoir. 101 passes through the partition wall 105 and is supplied to the heat storage unit 2. The partition wall 105, which is a porous body, functions as a member that prevents the backflow of the gas phase heat transport fluid G toward the first piping system 102.

  The dimension (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 function. For example, the diameter when the through hole is converted into a circle in a predetermined cross section. Or less than 50 micrometers. Moreover, the material of the porous body is not particularly limited, and examples thereof include the same material as the first lid body 15 and the second lid body 16. Specifically, for example, metal powder such as copper powder can be used. And a sintered metal, a metal mesh, a foam metal, a metal foil provided with a through hole, a metal plate provided with a through hole, and the like.

  Further, the backflow suppressing member is not limited to the partition wall 105 which is a porous body as long as it can prevent the backflow of the gas phase heat transport fluid G in the flow path 28, and has, for example, one hole. A member, a current plate, etc. may be sufficient and a valve may be sufficient.

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

  The gas phase heat transport fluid G introduced into the heat exchanging unit 106 is condensed and changed into a liquid phase, thereby becoming a liquid phase heat transport fluid L and releasing 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.

  Furthermore, 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. Through the third piping system 107, the liquid-phase heat transport fluid L that has undergone a phase change from the gas phase in the heat exchange unit 106 is returned to the reaction medium storage unit 101. Further, the third piping system 107 is provided with a second valve 108 which is a supply means for the liquid-phase heat transport fluid L.

  Therefore, the heat storage device 100 includes the first piping system 102, the second piping system 104, and the third piping system 107, respectively, from the reaction medium storage unit 101 to the heat storage unit 2, and from the heat storage unit 2 to the heat exchange unit. 106, a circulation system is formed in which a heat transport fluid as a 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 circulation system has a loop heat pipe structure.

  As shown in FIG. 3, the third piping system 107 of the heat storage device 100 is provided with a pressure adjustment unit 110. The pressure adjustment unit 110 has a function of making the pressures different between the heat storage unit 2 side and the reaction medium storage unit 101 side in the third piping system 107. During the heat radiation of the zeolite 12, the circulation and circulation of the heat transport fluid in the second piping system 104 and the third piping system 107 are promoted by reducing the pressure of the heat storage unit 2 side of the pressure adjusting unit 110. That is, by operating the pressure adjusting unit 110, the gas phase heat transport fluid G (gas phase adsorbed material) is smoothly guided to the heat exchange unit 106, and the gas phase heat transport fluid G is circulated and circulated. It is possible to prevent a decrease in heat storage and heat dissipation efficiency and a decrease in heat transport efficiency due to the inhibition of the heat.

  Moreover, since the desorption of the adsorbed material from the zeolite 12 is promoted by the pressure adjusting unit 110 reducing the pressure in the heat storage unit 2, the heat storage temperature of the zeolite 12 can be reduced, and the heat storage time of the zeolite 12 can be shortened. can do. Furthermore, when the pressure adjustment unit 110 reduces the pressure in the heat storage unit 2, when the heat storage device 100 is activated, the liquid phase heat transport fluid smoothly flows from the reaction medium storage unit 101 to the zeolite 12 accommodated in the heat storage unit 2. L can be supplied. As a result, the heat storage device 100 can be activated quickly.

  Moreover, the excess pressure gas phase heat transport fluid G remaining in the heat storage unit 2 can be smoothly recovered to the reaction medium storage unit 101 by the pressure adjustment unit 110. Furthermore, unnecessary pressure radiation between the heat storage unit 2 and the heat exchange unit 106 is achieved by providing the pressure adjusting unit 110 in the third piping system 107 that connects the heat exchange unit 106 and the reaction medium storage unit 101. Therefore, the heat transport efficiency of the heat storage device 100 is further improved.

  Examples of the pressure adjusting unit 110 include a pump and a compressor (compressor).

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

  Next, the example of the thermal storage system of the thermal storage apparatus of this invention is demonstrated using the component of the thermal storage apparatus 100 of FIG. When the heat storage unit 2 stores heat, the heat storage unit 2 receives heat from the external environment in a state where the first valve 103 of the heat storage device 100 is closed and the second valve 108 is opened. When the heat storage unit 2 receives heat from the external environment, the zeolite 12 releases a gas-phase adsorbate. At this time, the pressure adjusting unit 110 is operated to depressurize the inside of the heat storage unit 2 to promote the release of the adsorbed substance in the gas phase from the zeolite 12 (that is, the heat storage action of the zeolite 12). The vapor-phase adsorbate released from the zeolite 12 is smoothly transferred to the second piping system 104 and the heat exchange unit 106 (in the heat exchange unit 106, the adsorbate is phase-changed from the gas phase to the liquid phase). Circulate. Then, it is transported and stored as a liquid-phase adsorbed substance (that is, a liquid-phase heat transport fluid L) 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 radiation temperature. Further, for example, after a heat release operation of the heat storage unit 2, when a predetermined time has elapsed from the start of the heat release of the zeolite 12 (or the opening of the first valve 103), the liquid-phase heat transport fluid L is stored in the reaction medium. The timing for closing the first valve 103 may be determined 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.

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

  The second valve 108 may be closed according to the storage amount of the liquid-phase heat transport fluid L in the reaction medium storage unit 101. The storage amount of the liquid-phase heat transport fluid L may be obtained by actually measuring the volume in the reaction medium storage unit 101. The heat release time and heat release amount of the zeolite 12, the weight of the reaction medium storage unit 101, the heat exchange unit 106 It may be determined from the amount of heat release, the amount of discharge of the liquid heat transport fluid L from the heat exchange unit 106, or the like.

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

  Next, a heat storage device according to a second embodiment of the present invention will be described with reference to the drawings. In addition, about the same component as the thermal storage apparatus which concerns on 1st Embodiment, it demonstrates using the same code | symbol.

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

  Also in the heat storage device 200, the circulation and circulation of the gas phase heat transport fluid G in the circulation system of the heat storage device 200 is promoted by operating the pressure adjusting unit 110. Therefore, also in the heat storage device 200, it is possible to prevent a decrease in heat storage / heat radiation efficiency and a decrease in heat transport efficiency due to the inhibition of the circulation and circulation of the gas phase heat transport fluid G. Also in the heat storage device 200, the pressure adjustment unit 110 reduces the pressure in the heat storage unit 2 to promote the desorption of the adsorbed substances from the zeolite 12, so that the heat storage temperature of the zeolite 12 can be reduced, and the zeolite 12 The heat storage effect can be smoothed. Furthermore, when the pressure adjusting unit 110 reduces the pressure in the heat storage unit 2, the liquid phase heat transport fluid L is smoothly transferred from the reaction medium storage unit 101 to the zeolite 12 accommodated in the heat storage unit 2 when the heat storage device 100 is activated. Can supply.

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

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

  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. In addition, a groove having a capillary force formed on the outer surface of the inner tube may be used.

  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. However, the present invention is not limited thereto, and heat is released by reacting with a liquid reaction medium (for example, water) such as CaO or MgO. Chemical heat storage materials may be used.

  Moreover, in the heat storage part of each said embodiment, although the 1st wick structure was members, such as a metal sintered compact and a metal mesh constructed | assembled by baking a powdery metal material, Instead, the groove | channel which has the capillary force formed in the inner surface of a cylindrical body may be sufficient. Further, a second wick structure having a capillary structure may be provided on the inner surface of the inner tube.

  In the heat storage part of each of the above-described embodiments, the radial cross section of the cylindrical body is circular, but the shape of the cross section is not particularly limited. For example, in addition to the above flat type, an elliptical shape, a triangular shape Alternatively, a polygonal shape such as a rectangular shape, an oval shape, a rounded rectangular shape, or the like may be used. Furthermore, in the heat storage unit of each of the above-described embodiments, the first lid and the second lid are porous bodies, but instead of this, 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 body having the hole portion is used, but instead, the first lid body having no hole portion 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 section, so that the first lid body having no hole portion is connected to one end of the zeolite cylindrical body. It can arrange | position adjacent to a part side.

  Moreover, in the thermal storage part of each said embodiment, although the installation number of the 1st wick structure was one, the installation number is not specifically limited, You may provide two or more according to the condition used. . Moreover, in the heat storage part of each said embodiment, although the number of installation of the flow path provided inside the 1st wick structure was one, the number of installation is not specifically limited, The situation used A plurality of them may be provided depending on the situation. Moreover, although the wick structure is used as the diffusion layer in the heat storage section of each of the above-described embodiments, a pore structure of zeolite may be used instead.

  The method of using the heat storage device of the present invention is not particularly limited other than for the warming-up device of an internal combustion engine mounted on a vehicle. For example, the heat storage device may be used for a heating device in a vehicle. It may be used to recover, store, and use waste heat from the plant. Furthermore, other heat utilization destinations of the heat storage device of the present invention include, for example, indoor heating, a water heater, a dryer, and the like.

  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, 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 and heat dissipation efficiency and a decrease in heat transport efficiency by adjusting the pressure of the gas-phase working fluid in the system. It has high utility value in the field where it is mounted on a vehicle to collect, store, and use waste heat.

DESCRIPTION OF SYMBOLS 1, 2 Thermal storage part 12 Zeolite 100, 200 Thermal storage apparatus 101 Reaction medium storage part 106 Heat exchange part

Claims (6)

A heat storage section in which a heat storage material is housed, a reaction medium storage section connected to the heat storage section via the first piping system, in which a reaction medium that reacts with the heat storage material is stored, the heat storage section and the second And a heat exchange section connected via the piping system and the reaction medium reservoir and the third piping system,
A heat storage device in which a pressure adjusting unit is provided in the second piping system or the third piping system.   The heat storage device according to claim 1, wherein the pressure adjusting unit is provided in the third piping system.   The heat storage device according to claim 1, wherein the pressure adjusting unit is a decompression unit that decompresses the inside of the heat storage unit.   The heat storage section includes a tubular body, the heat storage material accommodated in the tubular body, a flow path penetrating the tubular body in the long axis direction, and a diffusion provided between the heat storage material and the flow path. The heat storage device according to claim 1, further comprising a layer. The heat storage unit;
The reaction medium storage unit containing the liquid phase reaction medium, connected to one end of the tubular body via the first piping system;
Connected to the other end of the tubular body via the second piping system, and the heat exchange unit connected to the reaction medium reservoir via the third piping system;
Having a circulatory system with
The heat storage device according to claim 4, wherein the circulation system is in an airtight state and is deaerated. A heat storage section in which a heat storage material is housed, a reaction medium storage section connected to the heat storage section via the first piping system, in which a reaction medium that reacts with the heat storage material is stored, the heat storage section and the second And a heat exchange part connected via the third piping system to the second piping system or the third piping system. A heat storage system using a heat storage device provided with a pressure adjustment unit,
A heat storage system in which the pressure adjusting unit operates at a timing at which the reaction medium is supplied to the heat storage unit, a timing at which the heat storage unit stores heat, and / or a timing at which heat is released from the heat storage unit.

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