JP2008202932A - Heat storage unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat storage unit, storing generated heat, transporting heat to a separate place, and efficiently storing heat in a short time. <P>SOLUTION: This heat storage unit includes a heat storage container 1a that houses: sodium acetate 3 storing heat by a state change between solid and liquid; and oil 2 which exchanges heat by directly contacting the sodium acetate 3, has smaller specific gravity than that of the sodium acetate 3, and is separated from the sodium acetate 3. The unit also includes: a supply pipe 4 that passes at least through the sodium acetate 3 housed in the heat storage container 1a and supplies the oil 2 into the heat storage container 1a; and a discharge pipe 6 that discharges the oil 2 housed in the heat storage container 1a to the outside of the heat storage container 1a. Then, the supply pipe 4 crosses the boundary surface between the oil 2 and the sodium acetate 3 which are housed in the heat storage container 1a, has a plurality of discharge holes that discharge the supplied oil 2a, and at least one of the discharge holes 6 are positioned in the oil 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat storage unit capable of storing generated heat and transporting heat to a remote place.

  The heat generated in factories, such as steelworks and garbage disposal sites, is used in various facilities near the factories. Moreover, the heat generated in the factory can be temporarily stored in a heat storage body or the like, and the heat storage body can be transported so that the heat can be used even in a place away from the factory. As an apparatus for storing heat, there is an apparatus for exchanging heat by directly contacting a medium such as oil supplied with heat and a metal hydrate to store heat in the metal hydrate.

  For example, the storage container of Patent Document 1 contains a heat storage body such as sodium acetate and oil having a specific gravity smaller than that of the heat storage body. Since the specific gravity of the oil is smaller and the oil and the heat storage body are not mixed, they are stored separately in the vertical direction. And a pipe is arrange | positioned in the oil and the thermal storage body, and each is connected to the heat exchanger. Oil is taken from one pipe into the heat exchanger, heat is supplied, and the oil supplied with heat is discharged from the other pipe into the heat accumulator. Since the discharged oil has a small specific gravity, it rises to the oil at the top. While rising, heat is exchanged by direct contact between the heat storage body and oil. By repeating the above operation, heat is stored in the heat storage body. And the pipe of patent document 1 has a double-pipe structure in order to prevent impurities from being mixed into the pipe or the heat exchanger.

International Publication Number WO 03/019099 (Figure 1)

A heat storage body such as sodium acetate that stores heat uses latent heat of fusion, and by adding heat, the heat storage body changes its state from a solid to a liquid and is stored. For this reason, in Patent Document 1, since the heat storage body is solid at the start of heat supply, even if it is attempted to discharge the heat-supplied oil from the pipe disposed in the heat storage body, the discharge hole becomes a solid heat storage body. The oil cannot be discharged and cannot be supplied to the heat storage body until it is blocked and the heat storage body is heated to become liquid. As a result, a great amount of time is spent on heat storage.
In Patent Document 1, a pipe having a double pipe structure is used in order to prevent impurities from being mixed into the pipe or the heat exchanger. However, this pipe structure has an ordinary pipe structure (simple single pipe). It is more complex than (structure).

  Accordingly, a first object of the present invention is to provide a heat storage unit capable of efficiently storing heat in a short time. The second object of the present invention is to provide a heat storage unit capable of separating a heat storage body and a medium such as oil with a simple structure.

Means and effects for solving the problems

  The present invention stores a heat storage body that stores heat by a change in state between a solid and a liquid, and a heat exchange medium that exchanges heat by directly contacting the heat storage body and has a specific gravity smaller than that of the heat storage body and does not mix with the heat storage body. A storage container, a supply pipe that passes through at least the heat storage body accommodated in the storage container and supplies the heat exchange medium into the storage container, and a discharge pipe that discharges the heat exchange medium accommodated in the storage container to the outside of the storage container; The supply pipe has a plurality of discharge holes for discharging the supplied heat exchange medium across the boundary surface between the heat exchange medium and the heat storage body accommodated in the storage container, and the discharge hole is at least 1 One is located in the heat exchange medium.

  According to this configuration, since the discharge hole is provided on the heat exchange medium side, the heat exchange medium can be discharged from the supply pipe regardless of the state of the heat storage body. The heat storage body is solid during normal times, and changes into a liquid by storing heat. For this reason, at the time of the start of heat storage, even if it provides the discharge hole in the supply pipe arrange | positioned in the heat storage body, the discharge hole is obstruct | occluded with the solid heat storage body. Then, the heat exchange medium supplied can be discharged | emitted by providing a discharge hole in the heat exchange medium side, and heat can be conducted to a thermal storage body. And if a thermal storage body changes from solid to a liquid, a heat exchange medium can be discharged also from the discharge hole provided in the thermal storage body side. Thereby, since a heat storage body and a heat exchange medium can be contacted in a short time, heat storage time can be shortened. In addition, if the heat exchange medium is not provided with a discharge hole, the heat exchange medium passing through the supply pipe may not be discharged due to the exhaust hole provided on the heat storage body being blocked, and heat storage may not be possible. Can be eliminated.

  The supply pipe of the present invention preferably traverses perpendicular to the interface. According to this, when the supply pipe vertically crosses the boundary surface, the heat exchange medium can be discharged along the supply pipe, and heat can be stored from the heat storage body in the vicinity of the supply pipe. Thereby, the heat exchange to the heat storage body by a heat exchange medium can be performed efficiently.

  In this case, it is preferable that the supply pipe has a circulation pipe that is coaxially disposed on the outer periphery of the portion having the discharge hole and raises the heat exchange medium discharged from the discharge hole in the vertical direction. According to this configuration, by circulating the supplied heat exchange medium in the vertical direction along the circulation pipe, a circulation flow accompanying a temperature change is generated around the circulation pipe. Thereby, heat can be efficiently conducted to the heat storage body, and the heat storage time can be shortened.

  In another aspect, the present invention relates to a heat storage body that stores heat by a state change between a solid and a liquid, and heat exchange by directly contacting the heat storage body, and has a specific gravity smaller than that of the heat storage body and does not mix with the heat storage body. A storage container for storing the medium, a supply pipe that passes through at least the heat storage body stored in the storage container and supplies the heat exchange medium into the storage container, and the heat exchange medium stored in the storage container is disposed outside the storage container. A discharge pipe for discharging, the supply pipe having a first supply pipe having a discharge hole for discharging the supplied heat exchange medium into the heat storage body, a heat exchange medium accommodated in the storage container, and the heat storage body. And a second supply pipe having an outlet in the heat exchange medium.

  According to this configuration, the heat storage time can be shortened by using the first and second flow pipes. The heat storage body can store heat by changing its state from solid to liquid. For this reason, since the heat storage body is solid at the start of heat storage, the discharge holes provided in the first supply pipe are blocked by the heat storage body, and the supplied heat exchange medium cannot be discharged. On the other hand, since the second supply pipe has an outlet in the heat exchange medium, the supplied heat exchange medium can always be discharged. For this reason, it can conduct heat to a heat storage body by the indirect contact of the heat exchange medium which distribute | circulates a 2nd supply pipe, and can make a heat storage body into a liquid from solid. And since a heat storage body turns into a liquid, a heat exchange medium can be discharged | emitted from the discharge hole of a 1st supply pipe | tube. Thus, the heat storage time can be shortened by switching the two supply pipes to store heat in the heat storage body.

  According to the present invention, in the heat storage body, it is preferable that the second supply pipe has a communication portion that surrounds at least a part including the discharge hole of the first supply pipe and guides the discharge hole to the heat exchange medium. . According to this, since the second supply pipe is surrounded by the first supply pipe, the heat of the surroundings of the second supply pipe and the heat of the first supply pipe is obtained by the heat exchange medium flowing through the second supply pipe. It becomes possible to heat the periphery of the exchange medium discharge hole. By heating these parts early and melting the solid heat storage body, the heat exchange medium is discharged from the first supply pipe at an early stage, and the heat exchange medium is brought into direct contact with the heat storage body, so that the heat storage time Can be shortened.

  In the present invention, it is preferable that a switching valve for switching between supply and shutoff of the heat exchange medium is provided for each of the first and second supply pipes according to the state of the heat storage body. According to this structure, the timing which switches a supply pipe | tube can be changed according to the state of a thermal storage body, and it can store heat more effectively. For example, at the start of heat storage, the heat exchange medium can be supplied to both the first supply pipe and the second supply pipe, and then supplied only to the first supply pipe. Can do.

  In the present invention, when at least a part of the supply pipe or the first supply pipe extends in the horizontal direction, a discharge hole is provided in the part extending in the horizontal direction so as to open vertically downward. Also good. According to this, since the specific gravity of the heat exchange medium is smaller than that of the heat storage body, there is no possibility that the heat storage body enters the supply pipe from the discharge hole when the discharge hole faces downward.

  According to the present invention, in the heat storage body, it is preferable that the supply pipe or the first supply pipe has a widened shape having a divergent shape and a bottom surface provided with the discharge hole. According to this configuration, since the specific gravity of the heat exchange medium is smaller than that of the heat storage body, there is no possibility that the heat storage body enters the supply pipe from the discharge hole when the discharge hole faces downward. Furthermore, by making it a diverging shape, more heat exchange media can be discharged, and the heat storage time can be shortened.

  Further, in another aspect, the present invention performs heat exchange by directly contacting the heat storage body that stores heat due to a change in state between solid and liquid, and has a specific gravity smaller than that of the heat storage body and does not mix with the heat storage body. A storage container that stores the heat exchange medium, a supply pipe that passes through at least the heat storage body stored in the storage container and supplies the heat exchange medium into the storage container, and a heat exchange medium stored in the storage container A discharge pipe for discharging to the outside, and the supply pipe has at least one of a first supply pipe having an outlet for discharging the supplied heat exchange medium into the stored heat storage body, and at least one of the first supply pipes. And a second supply pipe having a discharge hole for discharging the supplied heat exchange medium into the heat storage body.

  According to this configuration, regardless of the state of the heat storage body, the heat exchange medium can always flow through the first supply pipe, so that heat can be conducted to the heat exchange medium in the second supply pipe, High temperature can be maintained. Thereby, since a high temperature heat exchange medium can be discharged | emitted from an exhaust hole, it can fully accumulate heat.

  In the present invention, when the supply pipes are arranged in parallel in the heat storage body, the heat storage body between the supply pipes is preferably provided with a heat conducting member for conducting heat of the supply pipe. According to this, heat can be supplied to the heat storage body in a shorter time, and the heat storage time can be shortened.

  It is preferable that at least a part of the supply pipe of the present invention is provided on the bottom surface of the storage container. According to this configuration, the discharged heat exchange medium rises because its specific gravity is lighter than that of the heat storage body, but by providing the supply pipe at the bottom, the contact time between the discharged heat exchange medium and the heat storage body is increased. Can be longer. Moreover, in this invention, it is preferable that the 2nd supply pipe | tube is provided in the bottom face so that the bottom face of a storage container may be covered. According to this, since the contact surface of a 2nd supply pipe and a thermal storage body is large, and it can accumulate heat from the bottom part of a thermal storage body, thermal storage time can be shortened.

  It is preferable that the connection port of the supply pipe of the present invention is located above the connection port of the discharge pipe. According to this configuration, by positioning the connection port of the supply pipe higher than the connection port of the discharge pipe, when the heat storage body or the heat exchange medium flows backward, the heat exchange medium can be reversed from the discharge pipe first. It is possible to avoid the danger that the stored heat storage body will flow backward.

  It is preferable that the present invention has a wave-dissipating plate that is arranged in parallel to the boundary surface along the boundary surface between the heat storage body and the heat exchange medium and prevents stirring at the boundary surface. According to this configuration, it is possible to prevent agitation at the boundary surface due to vibration caused during transportation in the heat storage state.

  The discharge pipe of the present invention preferably includes a separation mechanism that separates the heat storage body and the heat exchange medium. According to this structure, when the heat storage body is mixed in the heat exchange medium discharged to the outside of the storage container, it can be removed. In this case, the separation mechanism has a separation body that horizontally flows the captured heat exchange medium and the heat storage body in one direction, and a discharge hole that discharges the precipitated heat storage body from the separation body. It is preferable to have a shape for guiding the precipitated heat storage body to the discharge hole. Thereby, a thermal storage body and a heat exchange medium are separable with a simple structure.

  The heat storage body of the present invention may be erythritol. According to this, heat can be efficiently stored in a short time.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
The heat storage unit 1 according to the first embodiment of the present invention is suitably used for a portable heat storage unit. For example, as shown in FIG. 1, when a factory 60 that generates heat and a facility 70 that uses the heat are separated from each other, the present invention is applied to a heat transport system that transports heat. The heat storage unit 1 is attachable to and detachable from the connection ports 51 and 52 of the heat exchangers 5a and 5b that store and radiate heat with respect to the heat storage unit 1, and is connected to the factory 60 by a transport device 50 such as a truck. It is transported between the facilities 70. The factory 60 is a waste incineration plant, a power plant, a steel mill, or the like, and heat generated therein is stored in the heat storage unit 1 through the heat exchanger 5a. The facility 70 is a facility such as a hot water pool or a hospital, and the heat stored in the heat storage unit 1 is applied to temperature control equipment in the facility 70 via the heat exchanger 5b. In the following description, heat exchange on the factory 60 side will be described.

  The heat storage unit 1 is supplied with a heat storage container 1a (storage container) containing oil 2 (heat exchange medium) and sodium acetate trihydrate 3 (heat storage body) (hereinafter referred to as sodium acetate 3), A tube 4 and a discharge tube 6 are provided. Oil 2 and sodium acetate 3 are not mixed with each other, and since oil 2 has a lower specific gravity than sodium acetate 3, the heat storage container 1a contains oil 2 in the upper layer and sodium acetate 3 in the lower layer. It has become so. Further, since the oil 2 and the sodium acetate 3 are not mixed with each other, no member or the like is provided between the oil 2 and the sodium acetate 3 so that the oil 2 and the sodium acetate 3 are directly connected. In contact.

  Oil 2 exchanges heat with sodium acetate 3 by direct contact with sodium acetate 3. When the oil 2 is taken into the heat exchanger 5a from the discharge pipe 6 to be described later and heat is supplied in the heat exchanger 5a (in the following description, the oil 2 supplied with heat by the heat exchanger 5a is replaced with the oil 2a). Is discharged into the sodium acetate 3 through the supply pipe 4. Since the discharged oil 2 a has a specific gravity smaller than that of sodium acetate 3, it rises to the upper oil 2 and is taken into the oil 2. During this rise, the heat supplied to the oil 2 a is conducted to the sodium acetate 3 by direct contact with the sodium acetate 3.

  Sodium acetate 3 stores the heat conducted from the oil 2a described above. Sodium acetate 3 has a melting point of about 58 degrees, and is solid at normal times (room temperature). Then, heat is conducted from the oil 2a by direct contact, so that the state changes from solid to liquid, and heat is stored in the liquid state.

  The supply pipe 4 extends through the upper layer portion of the heat storage container 1a where the stored oil 2 is located, and the connection port 41 is detachably connected to the connection port 51 of the heat exchanger 5a. The supply pipe 4 penetrating the heat storage container 1a vertically enters the sodium acetate 3 across the boundary surface between the oil 2 and the sodium acetate 3, and is bent in an L shape and extends horizontally. The supply pipe 4 has an internal space, and the oil 2a supplied with heat to the heat exchanger 5a flows through the internal space.

  Further, the supply pipe 4 has a plurality of discharge holes 4a and 4b for discharging the oil 2a flowing therethrough along the axial direction thereof. A plurality of discharge holes 4a are provided in the supply pipe 4 at the boundary between the oil 2 and sodium acetate 3 above the boundary, that is, on the oil 2 side. One or more discharge holes 4b are provided below the boundary surface, that is, in the supply pipe 4 on the sodium acetate 3 side. In addition, the discharge hole 4b provided in the part bent in the L-shape of the supply pipe 4 and extended horizontally is provided so that it may open in the perpendicular downward direction. Accordingly, the specific gravity of sodium acetate 3 is larger than that of oil 2a, so that the oil 2a discharged from the discharge hole 4b is pushed away, so that the sodium acetate 3 does not enter the supply pipe 4, and the inside of the supply pipe 4 It is possible to prevent the sodium acetate 3 from becoming hard and clogging.

  The discharge pipe 6 is penetrated in the upper layer part of the heat storage container 1a in which the stored oil 2 is located. And the connection port 61 of the discharge pipe 6 is detachably connected to the connection port 52 of the heat exchanger 5a, and the oil 2 in the heat storage container 1a is taken into the heat exchanger 5a. At this time, the connection port 61 of the discharge pipe 6 is arranged below the connection port 41 of the supply pipe 4, that is, the discharge pipe 6 is arranged below the supply pipe 4 in the heat storage container 1 a. When the supply pipe 4 and the discharge pipe 6 are removed from the heat exchanger 5a in the wrong procedure, the oil 2 or sodium acetate 3 may flow backward due to the difference in pressure between the outside and the inside of the heat storage container 1a. For this reason, by disposing the discharge pipe 6 below the supply pipe 4, the oil 2 that is not heated before the discharge pipe 6 flows backward. Thereby, there is no pressure difference with the outside, and it is possible to suppress the risk that the stored sodium acetate 3 flows backward from the supply pipe 4.

  The heat exchanger 5a stores heat generated in the factory 60 in the heat storage container 1a. As described above, the supply pipe 4 and the discharge pipe 6 are detachably connected to the heat exchanger 5a. The supply pipe 4 and the discharge pipe 6 communicate with each other in the heat exchanger 5a. Furthermore, the heat exchanger 5a is connected to a pipe (not shown) that takes in the heat generated in the factory 60 as steam and a pipe (not shown) that discharges the steam from which the heat has been removed. In the exchanger 5a, it communicates via a pipe arranged so as to surround a communicating portion between the supply pipe 4 and the discharge pipe 6. In addition, a pump (not shown) is disposed at the connection port 51 of the heat exchanger 5a. The heat exchanger 5a takes in the oil 2 and the taken oil 2 is sent into the heat storage container 1a.

  The heat exchanger 5a takes in the oil 2 in the heat storage container 1a through a discharge pipe 6 by a pump, and takes in steam generated in the factory 60 through a pipe. The taken-in steam conducts heat to the taken-in oil 2 by indirect contact between the pipes at the communication portion between the supply pipe 4 and the discharge pipe 6. Thereafter, the heat-supplied oil 2 a is supplied into the heat storage container 1 a through the supply pipe 4. The steam from which heat has been removed is exhausted through a pipe. The heat exchanger 5 a repeats the above operation, so that the heat generated in the factory 60 can be stored in the sodium acetate 3 of the heat storage unit 1.

  Next, a method for storing heat in the heat storage unit 1 will be described.

  Steam generated in the factory 60 is taken into the heat exchanger 5a. On the other hand, the oil 2 in the heat storage container 1a is taken into the heat exchanger 5a through the discharge pipe 6. And in the heat exchanger 5a, the heat | fever of a vapor | steam is conducted by the oil 2 taken in. The heat-supplied oil 2 a is returned to the heat storage container 1 a through the supply pipe 4.

  The oil 2a flows through the supply pipe 4 and is discharged from the discharge holes 4a and 4b. Since the sodium acetate 3 at the start of heat storage is solid and the discharge hole 4b is provided on the sodium acetate 3 side, the discharge hole 4b is closed by the solid sodium acetate 3. For this reason, at the start of heat storage, the oil 2a is not discharged from the discharge hole 4b.

  On the other hand, since the discharge hole 4a is provided on the oil 2 side, the oil 2a can be discharged without the discharge hole 4a being blocked. The oil 2 a discharged from the discharge hole 4 a conducts heat to the sodium acetate 3 in the vicinity of the boundary surface between the oil 2 and the sodium acetate 3. Thereby, the state of the sodium acetate 3 gradually changes from the upper part to the liquid state, and the oil 2a is discharged from the discharge hole 4b. Heat is stored in the sodium acetate 3 by direct contact with the discharged oil 2a. The oil 2 a flowing through the supply pipe 4 conducts heat to the sodium acetate 3 through indirect contact via the supply pipe 4. Thereby, the sodium acetate 3 can be changed from solid to liquid earlier, and the heat storage time can be shortened.

  When the sodium acetate 3 is in a liquid state and the oil 2a is discharged into the sodium acetate 3, the specific gravity of the oil 2a is smaller than that of the sodium acetate 3, so that the oil 2a rises and is taken up. The oil 2a conducts heat to the sodium acetate 3 while rising. By repeating the above operation, heat can be stored in the sodium acetate 3.

  Heretofore, the heat exchange on the factory 60 side has been described, but the same applies to the heat exchange on the facility 70 side. That is, the sodium acetate 3 becomes a liquid in a state where heat is stored, and the stored heat can be taken out from the liquid. The supply pipe 4 and the discharge pipe 6 of the heat storage unit 1 are detachably connected to a heat exchanger 5b that takes out the heat stored in the heat storage unit 1, and further, a gas or a liquid is supplied to the heat exchanger 5b. A pipe to be taken in and a pipe that supplies the heated gas or liquid to the temperature control equipment of the facility 70 are connected.

  The heat exchanger 5 b discharges the oil 2 into the sodium acetate 3 that is stored heat via the supply pipe 4. As the discharged oil 2 rises, heat is conducted from the sodium acetate 3 by direct contact. As a result, heat is supplied to the upper oil 2 and is taken from the discharge pipe 6 into the heat exchanger 5b. On the other hand, liquid such as gas or water is taken into the heat exchanger 5b. Then, the heat is transferred from the heated oil 2 to gas or liquid. The thermally conducted gas or liquid is supplied to the temperature control equipment in the facility 70 through the pipe. By repeating the above operation, the heat stored in the sodium acetate 3 can be taken out.

  Next, a heat transport system using the heat storage unit 1 according to the first embodiment will be described. The heat generated by the incineration of garbage at the factory 60 is stored in the heat storage unit 1 by repeating the above-described operation. Since the heat storage unit 1 is detachably connected to the heat exchanger 5a, the heat storage unit 1 is removed after completion of the heat storage, and is transported to the facility 70 that needs the stored heat by the transport device 50 such as a truck. The transported heat storage unit 1 is connected to the heat exchanger 5b, and the heat stored in the heat storage unit 1 is taken out and used for temperature control equipment of the facility 70 or the like.

  As described above, in the present embodiment, the discharge hole 4a is provided on the oil 2 side of the supply pipe 4, so that the oil 2a is discharged even if the sodium acetate 3 is solid at the start of heat storage. By discharging from 4a, solid sodium acetate 3 can be changed to liquid in a shorter time. Thereby, the heat storage time with respect to the sodium acetate 3 can be shortened.

  Further, by vertically crossing the boundary surface between the oil 2 and the sodium acetate 3 in the supply pipe 4, the oil 2a discharged from the discharge hole 4a changes the sodium acetate 3 nearer to the supply pipe 4 from a solid to a liquid state. The oil 2a can be discharged from the discharge hole 4b earlier. Therefore, the heat storage time can be further shortened.

  As a modification of the present embodiment, a circulation pipe 4c may be provided as shown in FIG. The circulation pipe 4c is provided so as to surround the outer periphery of the supply pipe 4 that perpendicularly crosses the boundary surface between the oil 2 and the sodium acetate 3, and is discharged from the discharge hole 4b after the state of the sodium acetate 3 changes to a liquid. It serves as a guide for raising the oil 2a in the vertical direction. As the heat-supplied oil 2a discharged through the discharge hole 4b rises along the circulation pipe 4c, the low-temperature liquid sodium acetate 3 moves to the lower part of the circulation pipe 4c. A circulating flow is generated around the circulation pipe 4c. Thereby, heat can be circulated, and the effect of shortening the heat storage time is achieved by efficiently storing heat in the sodium acetate 3.

  As another modification of the present embodiment, as shown in FIG. 4, a plurality of plates 11 (wave-dissipating plates) are provided so as to cross the boundary surface between the oil 2 and the sodium acetate 3 vertically. Also good. By providing the plate 11, when the heat storage unit 1 is transported, the oil 2 and the sodium acetate 3 vibrate, so that a wave is generated and stirring at the boundary surface can be prevented. By preventing stirring, the heat stored in the sodium acetate 3 can be maintained.

  Furthermore, as another modification, the separation device 12 may be provided in the middle of the discharge pipe 6. The separation device 12 is a device that separates the oil 2 and the sodium acetate 3 when the sodium acetate 3 is mixed in the taken-in oil 2. For example, although not shown, the separation device 12 has a structure in which the taken-in oil 2 is taken out from the upper portion of the separation device 12 while rotating in a spiral shape. In this case, since sodium acetate 3 has a higher specific gravity than oil 2, when it hits the side wall surface of separation device 12 by centrifugal force, sodium acetate 3 is discharged from the outlet at the bottom of separation device 12 along the side wall surface. Only the oil 2 is taken into the exchanger 5a. Thereby, the sodium acetate 3 can be removed from the oil 2 taken into the heat exchanger 5a, and there is no possibility of failure or the like caused by the sodium acetate 3 entering the heat exchanger 5a. The above modification can also be applied to embodiments described later.

  In the above-described embodiment, the supply pipe 4 crosses the boundary surface between the oil 2 and the sodium acetate 3 vertically. However, the supply pipe 4 may cross diagonally instead of vertically. In addition, the supply pipe 4 is bent in an L shape and extends in the horizontal direction, but may not extend in the horizontal direction. Any shape that can discharge the oil 2a into the sodium acetate 3 may be used. Further, as shown in FIG. 6, the side surface may have a diverging shape, or a diverging-shaped supply unit 13 (enlarged portion) may be provided in the middle of the supply pipe 4. In this case, it may be conical or hemispherical. Further, in this case, by providing the discharge hole 13a in the bottom portion, there is no possibility that the sodium acetate 3 enters the inside.

  Moreover, in this Embodiment, although the discharge hole 4b provided in the part of the supply pipe | tube 4 extended horizontally in the sodium acetate 3 is provided in the downward direction of the supply pipe | tube 4, even if it exists above Good. Further, in the present embodiment, sodium acetate is used as a substance for storing heat, and oil is used as a substance for conducting heat, but the present invention is not limited to this. For example, the heat storage body may be erythritol. Since erythritol can be heated with oil having a temperature of 120 ° C. or higher, it has the effect of being able to store heat efficiently in a short time.

(Second Embodiment)
Next, a heat storage unit according to the second embodiment of the present invention will be described. The heat storage unit according to the present embodiment is different from the first embodiment in that it includes two supply pipes. Only the differences will be described below. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 7, the heat storage unit 1 according to the present embodiment includes a first supply pipe 7 (first supply pipe) and a second supply pipe 8 (second supply pipe). . The 1st supply pipe 7 and the 2nd supply pipe 8 are penetrated by the upper layer part of the heat storage container 1a in which the accommodated oil 2 is located, and are further connected to the heat exchanger 5a so that attachment or detachment is possible. Specifically, the connection port of one supply pipe 11 is detachably connected to the connection port 51 of the heat exchanger 5a, and branches from the supply pipe 11 into a first supply pipe 7 and a second supply pipe 8. is doing. The first supply pipe 7 and the second supply pipe 8 penetrating the heat storage container 1a enter the sodium acetate 3 vertically across the boundary surface between the oil 2 and the sodium acetate 3, and are further L-shaped. It bends and extends horizontally. Further, the second supply pipe 8 vertically crosses the boundary surface between the oil 2 and the sodium acetate 3 from the end of the horizontally extending portion. The first supply pipe 7 and the second supply pipe 8 have an internal space, and the oil 2a supplied with heat by the heat exchanger 5a flows therethrough.

  The first supply pipe 7 has a plurality of discharge holes 7 a for discharging the supplied oil 2 a into the sodium acetate 3 along the axial direction. The second supply pipe 8 has an outlet 8 a that discharges the supplied oil 2 a into the oil 2. The outlet 8a is provided at the end of the second supply pipe 8, and the oil 2a supplied from the heat exchanger 5a flows through the second supply pipe 8 and is discharged into the oil 2 from the outlet 7a. ing. The discharge hole 4b provided in the portion extending in the horizontal direction of the first supply pipe 7 is provided in the vertically downward direction. The first supply pipe 7 may have a discharge hole on the oil 2 side, as in the first embodiment.

  As described above, the supply pipe 11 is detachably connected to the heat exchanger 5 a and is separated into the first supply pipe 7 and the second supply pipe 8. The first supply pipe 7 and the second supply pipe 8 are provided with valves 9a and 9b (switching valves), respectively. By opening and closing the valves 9a and 9b, the supply and shutoff of the oil 2a to the first supply pipe 7 and the second supply pipe 8 can be switched.

  The valves 9a and 9b open and close according to the state of the sodium acetate 3. Specifically, when the sodium acetate 3 is solid, the valve 9b is tightened so that the oil 2a is not supplied to the second supply pipe 8 so that the oil 2a is supplied only to the first supply pipe 7. Further, when the sodium acetate 3 is liquid, the valve 9a is closed, the valve 9b is opened, and the oil 2a is supplied only to the second supply pipe 8. The valves 9a and 9b may be manually opened and closed by an operator, or may be automatically opened and closed by connecting a controller. Since other members are the same as those in the first embodiment, description thereof will be omitted.

  Next, a method for storing heat in the heat storage unit 1 will be described.

  Steam is taken from the factory 60 through the pipe into the heat exchanger 5a. On the other hand, the oil 2 in the heat storage container 1a is taken into the heat exchanger 5a through the discharge pipe 6. And in the heat exchanger 5a, the heat | fever of the vapor | steam was supplied by heat conduction to the oil 2 taken in. At the start of heat storage, only the valve 9 b is opened, the oil 2 a is supplied only to the second supply pipe 8, and the heat-supplied oil 2 a flows through the second supply pipe 8. The oil 2a flows through the second supply pipe 8 and is discharged into the oil 2 from the outlet 8a. The oil 2a flowing through the second supply pipe 8 conducts heat to the sodium acetate 3 through indirect contact through the second supply pipe 8, whereby the solid sodium acetate 3 changes to a liquid.

  When the sodium acetate 3 becomes substantially liquid, the valve 9b is closed and the valve 9a is opened, whereby the second supply pipe 8 is shut off and the oil 2a is supplied to the first supply pipe 7. The oil 2a supplied to the first supply pipe 7 flows through the first supply pipe 7 and is discharged into the sodium acetate 3 from the discharge hole 7a. When the oil 2a is discharged, it rises to the upper oil 2 and is taken in. Heat is conducted to the sodium acetate 3 by direct contact with the sodium acetate 3 during its rise. Thereby, heat can be stored in the sodium acetate 3.

  As described above, in the present embodiment, two supply pipes for supplying the heat-supplied oil 2a are used, that is, the first supply pipe 7 and the second supply pipe 8, and according to the state of the sodium acetate 3. Thus, heat can be efficiently stored in the sodium acetate 3. Since the sodium acetate 3 is solid at the start of heat storage, the oil 2a is no longer discharged from the discharge hole provided in the sodium acetate 3. For this reason, when the sodium acetate 3 is solid, the oil 2a is supplied to the second supply pipe 8 and thermally conducted to the sodium acetate 3 by indirect contact. When the sodium acetate 3 becomes liquid, the oil 2a is supplied to the first supply pipe 7. Can be efficiently stored in sodium acetate 3 by conducting heat to sodium acetate 3 by direct contact.

  In addition, at the start of heat storage, the first supply pipe 7 may rupture because the oil 2a supplied from the discharge hole 7a is not discharged. For this reason, by switching the 1st supply pipe 7 and the 2nd supply pipe 8, the burst of the 1st supply pipe 7 etc. can be prevented and the heat storage unit 1 can be used safely.

  In the present embodiment, the oil 2 is supplied to only one of the first supply pipe 7 and the second supply pipe 8 according to the state of the sodium acetate 3, but the present invention is not limited to this. For example, at the start of heat storage, the oil 2a may be supplied only to the second supply pipe 8, and then the oil 2a may be supplied to both the first supply pipe 7 and the second supply pipe 8. Moreover, in the above-mentioned embodiment, although the 1st supply pipe | tube 7a does not have a discharge hole, you may have a discharge hole. Furthermore, the valves 9a and 9b may not be provided.

(Third embodiment)
Next, a heat storage unit according to the third embodiment of the present invention will be described. The heat storage unit according to the present embodiment is the same as the second embodiment in that it includes two supply pipes, but one supply pipe surrounds the other supply pipe. Is different. Only the differences will be described below. The same members as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 8, the heat storage unit 1 according to the present embodiment has two first supply pipes 7 and second supply pipes 10. The 1st supply pipe | tube 7 and the 2nd supply pipe | tube 10 are penetrated by the upper layer part of the heat storage container 1a in which the accommodated oil 2 is located, and are further connected to the heat exchanger 5a so that attachment or detachment is possible. Specifically, the connection port of one supply pipe 11 is detachably connected to the connection port 51 of the heat exchanger 5a, and branches from the supply pipe 11 into the first supply pipe 7 and the second supply pipe 10. is doing. In the heat storage container 1 a, the first supply pipe 7 is disposed so as to surround the second supply pipe 10. The first supply pipe 7 and the second supply pipe 10 vertically enter the sodium acetate 3 across the boundary surface between the oil 2 and the sodium acetate 3, and are bent in an L shape and extend horizontally. The first supply pipe 7 and the second supply pipe 10 have an internal space, and the oil 2a supplied with heat by the heat exchanger 5a flows therethrough. As described above, the first supply pipe 7 is disposed in the internal space of the second supply pipe 10.

  A plurality of supply cylinders 10 a that vertically traverse the boundary surface between the oil 2 and the sodium acetate 3 are disposed in the horizontally extending portion of the second supply pipe 10. The supply cylinder 10a has an outlet 10b on the oil 2 side. As shown in FIG. 9, the oil 2a flowing through the second supply pipe 10 passes through the supply cylinder 10a and is discharged into the oil 2 from the outlet 10b. It has become so. Further, as shown in FIG. 10, in the second supply pipe 10, oil 2 a flowing through the first supply pipe 7 is placed in the sodium acetate 3 at a position where it overlaps with the discharge hole 7 a of the surrounding first supply pipe 7. A communication part 10c for discharging is provided. Since other members are the same as those in the first embodiment, description thereof will be omitted.

  Next, a method for storing heat in the heat storage unit 1 will be described.

  Steam is taken from the factory 60 through the pipe into the heat exchanger 5a. On the other hand, the oil 2 in the heat storage container 1a is taken into the heat exchanger 5a through the discharge pipe 6. And in the heat exchanger 5a, it is supplied to the oil 2 in which the heat of steam was taken. At the start of heat storage, only the valve 9b is opened, and the oil 2a is supplied only to the second supply pipe 10. Accordingly, the heat-supplied oil 2a flows through the second supply pipe 10, passes through the supply cylinder 10a, and is discharged into the oil 2 from the outlet 10b.

  When the oil 2a supplied with heat flows through the second supply pipe 10 and the supply cylinder 10a, the oil 2a conducts heat to the sodium acetate 3 by indirect contact via the second supply pipe 10 and the supply cylinder 10a. To do. Thereby, sodium acetate 3 changes gradually from solid to liquid. When the sodium acetate 3 becomes liquid, the valve 9b is closed and the valve 9a is opened. As a result, the oil 2 a is supplied to the first supply pipe 7. Since the sodium acetate 3 becomes a liquid, the discharge hole 7a and the communication part 10c are not blocked, and the oil 2a can be discharged from the discharge hole 7a and the communication part 10c. Further, when the oil 2a flows through the first supply pipe 7, heat is conducted from the oil 2a flowing through the surrounding second supply pipe 10. Thereby, temperature rises further and the time which heat-stores in the sodium acetate 3 can further be shortened.

  As described above, in the present embodiment, in addition to the effects of the second embodiment, the oil 2b that flows through the first supply pipe 7 by surrounding the first supply pipe 7 with the second supply pipe 10. However, heat is further supplied from the second supply pipe 10, and the oil 2a is discharged to the sodium acetate 3, whereby heat can be stored more quickly. Furthermore, the area | region of the 1st supply pipe 7 and the 2nd supply pipe 10 arrange | positioned in the sodium acetate 3 can be decreased.

  In the present embodiment, the second supply pipe 10 surrounds substantially all of the first supply pipe 7 in the sodium acetate 3, but surrounds only a part of the first supply pipe 7. There may be. Similarly to the second embodiment, the oil 2a may be supplied to both the first supply pipe 7 and the second supply pipe 10 after the sodium acetate 3 has changed to a liquid. Further, the valves 9a and 9b may not be provided.

(Fourth embodiment)
Next, a heat storage unit according to the fourth embodiment of the present invention will be described. The heat storage unit according to the present embodiment includes two supply pipes, and is the same as the third embodiment in that one supply pipe surrounds the other supply pipe. The tube structure is different. Only the differences will be described below. In addition, about the same member as the 1st-3rd embodiment, the same code | symbol is attached and the description is abbreviate | omitted.

  As shown in FIG. 11, the heat storage unit 1 according to the present embodiment has two first supply pipes 15 and second supply pipes 16. The 1st supply pipe | tube 15 and the 2nd supply pipe | tube 16 are penetrated by the upper layer part of the heat storage container 1a in which the accommodated oil 2 is located, Furthermore, it connects to the heat exchanger 5a so that attachment or detachment is possible. Specifically, the connection port of one supply pipe 11 is detachably connected to the connection port 51 of the heat exchanger 5a, and branches from the supply pipe 11 into a first supply pipe 15 and a second supply pipe 16. is doing.

  The first supply pipe 15 and the second supply pipe 16 cross the boundary surface between the oil 2 and the sodium acetate 3 vertically and enter the sodium acetate 3, and are bent in an L shape and extend horizontally. The first supply pipe 15 is further provided with an outlet 15a that is bent in an L shape, crosses the boundary surface again vertically, and discharges the oil 2a at the tip bent in an L shape. The 1st supply pipe | tube 15 and the 2nd supply pipe | tube 16 have internal space, and the oil 2a heat-supplied by the heat exchanger 5a distribute | circulates. The second supply pipe 16 surrounds the first supply pipe 15 in a portion where the supply pipes 15 and 16 extend horizontally.

  The horizontally extending portions of the supply pipes 15 and 16 are disposed on the bottom surface of the storage container 1a. Thereby, the contact time of the oil 2a discharged | emitted from the discharge hole 16a and the sodium acetate 3 can be lengthened, and the heat of the oil 2a can fully be conducted to the sodium acetate 3. Further, when the sodium acetate 3 is liquefied, the oil 2a has a specific gravity smaller than that of the sodium acetate 3 and therefore rises when discharged from the discharge hole 16a. Therefore, the sodium acetate 3 near the bottom of the heat storage container 1a. However, by arranging the supply pipes 15 and 16 on the bottom surface, sufficient heat can be stored in the sodium acetate 3 near the bottom surface, and the heat storage time can be shortened. It can be done.

  The second supply pipe 16 is provided with a discharge hole 16a for discharging the oil 2a into the sodium acetate 3 in the direction opposite to the bottom surface side of the storage container 1a. Thereby, the oil 2a supplied to the supply pipe 11 passes through the first supply pipe 15 and is discharged into the oil 2 from the outlet 15a, while passing through the second supply pipe 16 and into the sodium acetate 3 from the discharge hole 16a. It is supposed to be discharged.

  Next, a method for storing heat in the heat storage unit 1 will be described.

  Steam is taken from the factory 60 through the pipe into the heat exchanger 5a. On the other hand, the oil 2 in the heat storage container 1a is taken into the heat exchanger 5a through the discharge pipe 6. And in the heat exchanger 5a, it is supplied to the oil 2 in which the heat of steam was taken. Thereafter, the heat-supplied oil 2 a is supplied to the supply pipe 11 and flows through the first supply pipe 15 and the second supply pipe 16. The oil 2a flowing through the first supply pipe 15 is discharged into the oil 2 from the outlet 15a. Further, the oil 2a flowing through the second supply pipe 16 is discharged into the sodium acetate 3 from the discharge hole 16a.

  At the start of heat storage, since the sodium acetate 3 is solid, the oil 2a is difficult to be discharged from the discharge hole 16a, so the outlet is blocked, and the oil 2a is not easily circulated through the second supply pipe 16. And in the meantime, there exists a possibility that the temperature of the oil 2a may fall. On the other hand, since the outlet 15a of the first supply pipe 15 is provided in the oil 2, the oil 2a can always flow through the first supply pipe 15 regardless of the state of the sodium acetate 3 at the start of heat storage, As for the oil 2a in the 1st supply pipe | tube 15, the hot oil 2a always distribute | circulates. For this reason, the oil 2a in the second supply pipe 16 is always in contact with the first supply pipe 15 through which the high-temperature oil 2a circulates, so that heat is conducted, and the high temperature can be maintained without lowering the temperature. Thereby, the hot oil 2a can be discharged to the sodium acetate 3 from the discharge hole 16a. In addition, the second supply pipe 16 can also maintain a high temperature, and heat can be conducted to the sodium acetate 3 in the vicinity of the second supply pipe 16.

  In the present embodiment, the supply pipes 15 and 16 are disposed on the bottom surface of the heat storage container 1a, but may not be disposed on the bottom surface. In this case, the arrangement position of the discharge hole 16a is not limited as described above. When the supply pipes 15 and 16 are not disposed on the bottom surface, the supply pipes 15 and 16 are preferably disposed close to the bottom surface.

  As described above, in the present embodiment, since the oil 2a discharged from the discharge hole 16a is thermally conducted from the first supply pipe 15, it is possible to always maintain a high temperature and shorten the heat storage time. Can do. Moreover, the contact time of the discharged | emitted oil 2a and the sodium acetate 3 can be made longer by arrange | positioning a supply pipe | tube to the bottom face of the storage container 1a. And since oil 2a has a high specific gravity and rises after discharge, it is difficult to store heat in the lower sodium acetate 3, but it can store heat in the entire sodium acetate 3 by arranging the supply pipe on the bottom surface. become.

  As a modification of the present embodiment, as shown in FIG. 12, the supply pipes 15 and 16 may be arranged side by side at equal intervals in the horizontal direction. By arranging in parallel, the oil 2a, the supply pipes 15 and 16 and the sodium acetate 3 can be brought into direct contact over a wider range, and the heat storage time can be further shortened. In this case, it is preferable to provide a wave-shaped conductive plate 17 (heat conducting member) so as to be continuous with the supply pipes 15 and 16.

  The conductive plate 17 has a corrugated shape in which circular arcs are alternately reversed, and the second supply pipe 16 is fitted to the circular arc portion, and is arranged on the bottom surface by being in close contact by welding or the like. As a result, the contact area between the second supply pipe 16 and the conductive plate 17 increases, and the amount of heat conducted to the conductive plate 17 increases, so that sufficient heat is applied to the sodium acetate 3 between the supply pipes 15 and 16. Can be conducted. Thereby, heat storage time can be shortened more. The conductive plate 17 is preferably made of a metal having high thermal conductivity such as copper, aluminum, or iron. The conductive plate 17 may have a plate shape instead of a corrugated shape. Furthermore, the supply pipes 15 and 16 may be arranged side by side in the vertical direction, and the adjacent supply pipes 15 and 16 may not be equally spaced.

  As another modified example, as shown in FIGS. 13 and 14, the second supply pipe 16 covers substantially the entire bottom surface of the storage container 1a, and further, the second supply pipe 16 covers the bottom surface. Alternatively, the first supply pipe 15 may be stretched around. By arrange | positioning so that the 2nd supply pipe | tube 16 may cover the bottom face substantially, heat can be conducted for sodium acetate 3 from the whole lower part, and heat storage time can be shortened. Furthermore, since the 1st supply pipe 15 distribute | circulates the 2nd supply pipe 16 whole, the oil 2a in the 2nd supply pipe 16 can be maintained at high temperature. In this case, it is preferable that the first supply pipe 15 passes through the vicinity of the discharge hole 16a. Thereby, the oil 2a discharged | emitted from the discharge hole 16a can also be maintained as high temperature as possible, and heat storage time can be shortened.

  Furthermore, as another modification, a separation device 14 (separation mechanism) as shown in FIG. 15 may be provided between the outlet 15 a of the first supply pipe 15 and the discharge pipe 6. The separation device 14 is a device that separates the oil 2 and the sodium acetate 3 when the sodium acetate 3 is mixed in the taken-in oil 2. The separation device 14 has a main body 14 a (separator) that takes in the oil 2 containing sodium acetate 3. The main body 14a is filled with oil 2, and the oil 2 taken in horizontally flows in one direction horizontally and is then discharged. The bottom surface of the main body 14a has a horizontal surface and an inclined surface, and a hole 14b for discharging the sodium acetate 3 is provided on the horizontal surface. As will be described in detail later, since the bottom surface has an inclined surface, the precipitated sodium acetate 3 is guided to the hole 14b.

  When the oil 2 contains the sodium acetate 3, the sodium acetate 3 having a specific gravity larger than that of the oil 2 precipitates while flowing horizontally in the main body 14a. The precipitated sodium acetate 3 is discharged from the hole 14b. In addition, since the bottom surface of the main body 14a has an inclined surface, the sodium acetate 3 precipitated on the inclined surface also slides toward the hole 14b and is discharged from the hole 14b. By providing the separation device 14 between the outlet 15a and the discharge pipe 6, the oil 2a does not contain sodium acetate 3, and even if sodium acetate 3 is contained, Since precipitation can be removed, there is no possibility of a failure or the like caused by sodium acetate 3 entering the heat exchanger 5a. Note that the separation device 14 may be provided in the middle of the discharge pipe 6.

  Although the present invention has been described in the preferred embodiments above, the present invention is not so limited. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

1 is an overall schematic diagram of a heat transport system of the present invention. Sectional drawing of the heat storage unit which concerns on the 1st Embodiment of this invention. The modification of the heat storage unit which concerns on 1st Embodiment. Another modification of the heat storage unit which concerns on 1st Embodiment. Another modification of the heat storage unit which concerns on 1st Embodiment. Another modification of the heat storage unit which concerns on 1st Embodiment. Sectional drawing of the heat storage unit which concerns on the 2nd Embodiment of this invention. Sectional drawing of the heat storage unit which concerns on the 3rd Embodiment of this invention. Sectional drawing in the IX-IX line of FIG. Sectional drawing in the XX of FIG. Sectional drawing of the heat storage unit which concerns on the 4th Embodiment of this invention. Sectional drawing in the XII-XII line | wire of FIG. 11 in the modification of the heat storage unit which concerns on 4th Embodiment. Sectional drawing in the XIII-XIII line of FIG. 11 in another modification of the heat storage unit which concerns on 4th Embodiment. Sectional drawing in the XIV-XIV line | wire of FIG. 11 in another modification of the heat storage unit which concerns on 4th Embodiment. The expanded sectional view of a separation device in another modification of the heat storage unit concerning a 4th embodiment.

Explanation of symbols

1 heat storage unit 1a heat storage container 2 oil 2a (heated) oil 3 sodium acetate 4 supply pipes 4a and 4b discharge holes 5a and 5b heat exchanger 6 discharge pipe

Claims (4)

A heat storage body that stores heat by changing the state of the solid and the liquid;
Heat exchange by directly contacting the heat storage body, a storage container containing a heat exchange medium having a specific gravity smaller than that of the heat storage body and not mixed with the heat storage body;
A supply pipe that passes through at least the heat storage body accommodated in the storage container and supplies the heat exchange medium into the storage container;
A discharge pipe for discharging the heat exchange medium accommodated in the storage container to the outside of the storage container;
The said exhaust pipe is provided with the separation mechanism which isolate | separates the said thermal storage body and the said heat exchange medium, The heat storage unit characterized by the above-mentioned.   The heat storage unit according to claim 1, wherein the separation mechanism separates the heat storage body and the heat exchange medium by a specific gravity difference.   The separation mechanism includes a separation body that horizontally distributes the heat exchange medium and the heat storage body taken in the separation mechanism in one direction, and a discharge hole that discharges the heat storage body that precipitates due to a difference in specific gravity from the separation body. The heat storage unit according to claim 1 or 2, characterized by comprising:   The heat storage unit according to claim 3, wherein the separator has a shape that guides the heat storage body precipitated due to the difference in specific gravity to the discharge hole.

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