thermal storage device

Abstract

Heat is efficiently recovered from high-temperature gases using heat storage materials. [Solution] The heat storage device 1, which stores heat in granular heat storage material, has an annular inner layer 11 that forms a gas channel 14 through which high-temperature gas flows, and an annular outer layer 12 that covers the outer circumference of the inner layer 11. A movement path 15, which is a space isolated from the gas channel 14, is located between the inner layer 11 and the outer layer 12. The heat storage material in a heat-releasing state is introduced into the movement path 15 through the introduction section. As it moves through the movement path 15, the heat from the high-temperature gas is transferred via the inner layer 11, causing the heat storage material to enter a heat-storage state. The heat-storage material in the heat-storage state is discharged from the discharge section.

Description

Technical Field

[0001] The present invention relates to a heat storage device that stores heat in a heat storage material.

Background Art

[0002] Conventionally, technologies have been studied to store waste heat discharged from factories, facilities, etc. in a heat storage material and release and utilize the heat when necessary or at different locations. As heat storage materials, those that utilize latent heat by adsorption and desorption of water vapor such as zeolite and haskray, and those that utilize chemical reaction heat through water such as magnesium oxide and calcium oxide are known.

[0003] For example, Patent Document 1 discloses a heat storage system that supplies air heated by a heating unit during heat storage operation to a container housing a heat storage material using a fan. Patent Document 2 discloses a technique for storing or transporting a detachable heat storage container encapsulating a chemical heat storage material.

[0004] Patent Document 3 discloses a technique for storing and releasing heat by moving a heat storage material using gravity on a plate-shaped heat exchange part or between tubular heat exchange parts. Patent Document 3 also mentions a PCM (Phase Change Material) capsule in which a latent heat storage material is encapsulated in a metal capsule.

[0005] Note that Patent Document 4 discloses a technique for recovering heat from an incinerator by arranging a heat transfer tube group in a reburning chamber and using a heat exchanger connected to the heat transfer tube group to recover heat. Also, Patent Document 5 discloses a technique in a pyrolysis residue transfer mechanism for discharging pyrolysis residues from a discharge path onto a receiving plate, allowing them to stay on the receiving plate with a repose angle, and reciprocating the receiving plate to disrupt the stability of the pyrolysis residues and cause them to flow down from both sides of the receiving plate.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-79706 [Patent Document 2] Japanese Patent Publication No. 2015-124931 [Patent Document 3] International Publication No. 2023 / 176406 [Patent Document 4] Japanese Patent Publication No. 2001-286727 [Patent Document 5] Japanese Patent Application Publication No. 9-296919 [Overview of the project] [Problems that the invention aims to solve]

[0007] Incidentally, in order to transfer the heat of high-temperature gas to granular heat storage material, if the heat storage material is placed directly in the high-temperature gas flow path, or if a heat exchanger or similar device is placed in the high-temperature gas flow path to transfer heat to the heat storage material, the flow of high-temperature gas is obstructed, increasing the power consumption of the blower and reducing the efficiency of heat energy recovery. Furthermore, if a heat exchanger is used, energy is also required to drive the heat exchanger.

[0008] This invention has been made in view of the above problems and aims to efficiently recover heat from high-temperature gases. [Means for solving the problem]

[0009] One aspect of the present invention is a heat storage device for storing heat in granular heat storage material, comprising: an annular inner layer that forms a gas channel through which a high-temperature gas flows; an annular outer layer that covers the outer circumference of the inner layer; an introduction section for introducing a heat storage material in a heat-releasing state into a movement path which is a space located between the inner layer and the outer layer and isolated from the gas channel; and an discharge section for discharging the heat storage material, which has entered a heat-storing state as the heat of the high-temperature gas is transferred through the inner layer while moving through the movement path.

[0010] Aspect 2 of the present invention is a heat storage device according to aspect 1, wherein the high-temperature gas is exhaust gas generated in a combustion device.

[0011] A third aspect of the present invention is a heat storage device according to aspect 1 (or aspect 1 or 2), wherein the inner layer is formed of a fire-resistant material.

[0012] Aspect 4 of the present invention is a heat storage device according to Aspect 1 (which may be any one of Aspects 1 to 3), wherein the inner layer is the inner wall of the recombustion chamber of an incinerator.

[0013] Aspect 5 of the present invention is a heat storage device according to aspect 1 (which may be any one of aspects 1 to 4), wherein the heat storage material moves within the movement path by gravity.

[0014] Aspect 6 of the present invention is a heat storage device according to Aspect 1 (which may be any one of Aspects 1 to 5), wherein the direction of movement of the heat storage material in the transfer path is parallel to the direction of movement of the high-temperature gas in the gas flow path.

[0015] Aspect 7 of the present invention is a heat storage device according to Aspect 1 (which may be any one of Aspects 1 to 6), wherein the discharge section comprises a discharge port that opens downward in the direction of gravity and discharges the heat storage material from the movement path; an opposing surface that is spaced apart below the discharge port and faces the discharge port, thereby preventing the heat storage material from falling from the discharge port by accumulating and holding the heat storage material between itself and the discharge port; and a moving mechanism that moves the opposing surface to disrupt the holding state of the heat storage material, thereby causing the heat storage material to fall from the discharge port.

[0016] Embodiment 8 of the present invention is a heat storage device according to any one of embodiments 1 to 7, wherein the heat storage material is a chemical heat storage material.

[0017] Aspect 9 of the present invention is a heat storage device according to any one of aspects 1 to 7, wherein the heat storage material is a latent heat storage material. [Effects of the Invention]

[0018] According to the present invention, heat can be efficiently recovered from high-temperature gases. [Brief explanation of the drawing]

[0019] [Figure 1] It is a diagram showing the configuration of an incinerator. [Figure 2] It is a diagram showing the right half of the longitudinal section of the afterburning chamber. [Figure 3] It is a diagram showing the cross section of the afterburning chamber. [Figure 4] It is a diagram showing the introduction part. [Figure 5] It is a diagram showing the discharge part. [Figure 6] It is a diagram showing a heat utilization system. [Figure 7] It is a cross-sectional view showing another example of the heat storage device. [Figure 8] It is a diagram showing another example of the introduction part.

Embodiments for Carrying Out the Invention

[0020] FIG. 1 is a diagram showing the configuration of an incinerator 3 having an afterburning chamber (also referred to as a “secondary combustion chamber”) 34 in which a heat storage device 1 according to the present invention is provided. The incinerator 3 is provided, for example, in a waste incineration facility. The incinerator 3 includes an input hopper 31, an outlet 32, a combustion chamber 33, and an afterburning chamber 34. Waste is input into the input hopper 31 from a waste pit by a waste crane. The waste is supplied from the bottom of the input hopper 31 into the combustion chamber 33. A mechanism for conveying waste is provided at the bottom of the combustion chamber 33, and the waste (mainly ash) after combustion is discharged outside the combustion chamber 33 through the outlet 32.

[0021] The afterburning chamber 34 is a space surrounded by side wall portions and forms a flow path for exhaust gas discharged directly and continuously from the combustion chamber 33. In the example of FIG. 1, the afterburning chamber 34 is a space having a sufficiently small flow path area compared to the floor area of the combustion chamber 33 and extending upward. In the afterburning chamber 34, unburned gas generated in the combustion chamber 33 burns. The exhaust gas discharged from the afterburning chamber 34 is led to exhaust gas treatment equipment provided downstream through an exhaust gas flow path 4.

[0022] Figure 2 shows the right half of the longitudinal section of the recombustion chamber 34. Figure 3 shows a cross-section of the recombustion chamber 34. The recombustion chamber 34 has an inner layer 11, an outer layer 12, an intermediate layer 13, and an outermost layer, a casing 18. The inner layer 11 is a refractory layer and is made of a refractory material. The inner layer 11 is annular, and the inside of the inner layer 11 is a gas flow path 14 through which the exhaust gas, which is a high-temperature gas, flows from bottom to top. That is, the inner layer 11 is the inner wall of the recombustion chamber 34 of the incinerator 3 and forms the gas flow path 14. The outer layer 12 is annular and (indirectly) covers the outer circumference of the inner layer 11. The outer layer 12 is an outer insulating layer. The casing 18 is made of, for example, metal.

[0023] The intermediate layer 13 is an annular insulating layer located between the inner layer 11 and the outer layer 12. The intermediate layer 13 and the outer layer 12 suppress the transfer of heat from the exhaust gas to the casing 18. Between the inner layer 11 and the outer layer 12, there is a passage 15 through which the heat storage material 9 moves. As shown in Figure 2, the passage 15 extends parallel to the gas flow path 14, and in this embodiment, it extends in the vertical direction in the direction of gravity. As shown in Figure 3, a plurality of passages 15 are arranged in the circumferential direction. The passages 15 are provided so as to be located within the insulating layer formed by the intermediate layer 13 and the outer layer 12. Preferably, there is little to no insulating material between the inner layer 11 and the passage 15 forming the intermediate layer 13.

[0024] The heat storage device 1 includes the inner layer 11, the outer layer 12, the introduction section 16 shown in Figure 2, and the discharge section 17. Of the inner layer 11, outer layer 12, and intermediate layer 13, the portion that forms the transfer path 15 (hereinafter referred to as the "transfer path forming section") can be considered as one of the components of the heat storage device 1. The transfer path forming section may be formed from a different material than the inner layer 11, outer layer 12, and intermediate layer 13, or may be partially formed from a different material. The introduction section 16 stores the heat storage material 9 in a heat-releasing state and introduces the heat storage material 9 from outside the outer layer 12 into the transfer path 15 via the introduction pipe 161. The discharge section 17 stores the heat storage material 9 discharged from the transfer path 15 via the discharge pipe 171.

[0025] The transfer path 15 is located between the inner layer 11 and the outer layer 12 and is a space isolated from the gas flow path 14. As the heat storage material 9 moves downward in the direction of gravity within the transfer path 15, it enters a heat storage state as heat from the exhaust gas is transferred through the inner layer 11. The heat storage material 9 is then discharged from the discharge section 17. In the example shown in Figure 2, the discharge section 17 discharges and stores the heat storage material 9. Any type of heat storage material 9 can be used, but preferably a chemical heat storage material or a latent heat storage material is used.

[0026] When magnesium hydroxide is used as the chemical heat storage material before heat storage, the heat storage material 9 becomes hot due to heat transfer or radiant heat from the inner layer 11, and in the subsequent dehydration reaction in which water is removed from the magnesium hydroxide, the main component of the heat storage material 9 changes to magnesium oxide. Mg(OH)2+heat of dehydration → MgO+H2O Heat is stored in the heat storage material 9. The generated water vapor rises along the transport path 15.

[0027] Figure 4 shows the introduction section 16. The introduction section 16 has an introduction pipe 161, a storage section 162, and a steam discharge pipe 163. Granular heat storage material 9 is stored in the storage section 162. The introduction pipe 161 extends diagonally downward from the bottom of the storage section 162. The heat storage material 9 moves from the storage section 162 to the introduction pipe 161 using gravity. The steam discharge pipe 163 branches off from the introduction pipe 161 and extends upward. Steam generated in the transfer path 15 rises and is guided from the introduction pipe 161 to the steam discharge pipe 163. The steam discharge pipe 163 is connected to a heat exchanger 81, where heat is recovered from the steam and water obtained by the condensation of the steam is also recovered.

[0028] In detail, the inlet pipe 161 branches into several branch pipes along its course and connects to some of the multiple transfer paths 15 shown in Figure 3. The inlet sections 16 are provided at multiple locations around the re-combustion chamber 34, thereby introducing the heat storage material 9 into all of the transfer paths 15. In addition, to assist in the rise of water vapor, air may be gently introduced into the transfer paths 15 from the lower end.

[0029] Figure 5 shows the discharge section 17. The discharge section 17 includes a discharge pipe 171, a blocking plate 172, a cover 173, and a moving mechanism 176. The discharge pipe 171 extends diagonally downward from the lower end of the moving path 15. The lower end of the discharge pipe 171 is an outlet 174 that opens downward in the direction of gravity. The outlet 174 discharges the heat storage material 9 guided from the moving path 15. The blocking plate 172 is a horizontal plate, and its upper surface is an opposing surface 175 that faces the outlet 174. The space between the shaft 172a of the blocking plate 172 and the cover 173 is sealed with a gland seal or the like. The blocking plate 172 is moved by the moving mechanism 176.

[0030] The opposing surface 175 is positioned below the outlet 174, spaced apart, and faces the outlet 174. The opposing surface 175 holds the heat storage material 9 between itself and the outlet 174, thereby preventing the heat storage material 9 from falling from the outlet 174. That is, the heat storage material 9 falling from the outlet 174 spreads out on the opposing surface 175 and accumulates in a mountain-like shape at approximately the angle of repose. However, when the height of the accumulated heat storage material 9 reaches the height of the outlet 174, the outlet 174 is blocked by the heat storage material 9, and the falling of the heat storage material 9 stops.

[0031] When the heat storage material 9 is dropped from the discharge port 174, the moving mechanism 176 moves the opposing surface 175 horizontally as indicated by arrow 176a, or moves the opposing surface 175 so that it is tilted (i.e., rotated), thereby breaking the holding state of the heat storage material 9. The holding state of the heat storage material 9 may also be broken by the downward movement of the opposing surface 175. The heat storage material 9 is dropped periodically for predetermined intervals. The dropped heat storage material 9 is discharged from the opening 177 at the bottom of the cover 173 and stored in a heat storage material tank (not shown) located below the opening 177. This recovers the heat storage material 9 in its heat-storing state. When the heat storage material 9 drops from the discharge port 174, the heat storage material 9 in the moving path 15 moves downward, and the heat storage material 9 is supplied to the moving path 15 from the introduction section 16.

[0032] By utilizing the opposing surface 175 to deposit and hold the heat storage material 9 between the opposing surface 175 and the discharge port 174, and by utilizing the natural fall of the heat storage material 9 for discharge, the discharge of the heat storage material 9 can be controlled with a simple structure.

[0033] In detail, the heat storage material 9 is guided from multiple transfer paths 15 to a single discharge pipe 171. Discharge sections 17 are provided at multiple locations around the re-combustion chamber 34, thereby guiding the heat storage material 9 from all the transfer paths 15 to the multiple discharge sections 17. Note that the heat storage material tank located below the opening 177 may also be considered as part of the discharge section 17.

[0034] In the heat storage device 1 described above, heat can be recovered from high-temperature gas without installing structures such as heat exchangers in the gas flow path 14. This reduces the energy required to circulate the high-temperature gas and allows for efficient heat recovery from the high-temperature gas. Furthermore, compared to supplying gas heated by high-temperature gas into the storage tank of the heat storage material 9, the energy required for blowing air during heat storage can be significantly reduced. Since there is no need to install structures in the gas flow path 14, the costs required for maintenance of structures in the gas flow path 14, such as the cost of removing soot and dust adhering to the structures or the cost of replacing structures due to corrosion caused by chlorine in the exhaust gas, can be reduced.

[0035] By installing the heat storage device 1 on the side wall of the re-combustion chamber 34, heat can be stored in the heat storage material 9 without significantly altering the design of the re-combustion chamber 34. As a result, the increase in design and manufacturing costs of the re-combustion chamber 34 can be suppressed. Furthermore, since the heat storage device 1 is not a device that stores heat while circulating a heat transfer medium, it can have a simple structure, and requires less space to install the heat storage device 1.

[0036] Incidentally, as shown in Figures 2 and 3 of the aforementioned International Publication WO2023 / 176406, when a high-temperature heat transfer medium flows through a pipe perpendicular to the direction of movement of the heat storage material, that is, when the direction of movement of the heat storage material intersects with the direction of movement of the heat transfer medium, the heat transfer medium moves while losing heat to the heat storage material, so the temperature of the heat transfer medium differs between the inlet and outlet of the pipe. As a result, it becomes difficult to uniformly heat the heat storage material near the discharge point. In contrast, in the heat storage device 1 shown in Figures 2 to 7, the heat storage material 9 moves parallel to (including cases where it is almost parallel; the same applies hereinafter) the direction of flow of the high-temperature gas, so the heat storage material 9 does not receive heat only on the inlet side of the re-combustion chamber 34 or only on the outlet side, and even if there is a difference in the temperature of the high-temperature gas between the inlet side and the outlet side of the re-combustion chamber 34, the heat storage material 9 can be uniformly heated near the discharge point. As a result, the heat storage material 9, which is uniformly heated with a simple structure, can be discharged from the entire circumferential direction, and heat can be efficiently stored in the heat storage material. The same effect can be obtained by increasing the diameter or length of the travel path 15.

[0037] Furthermore, since it is preferable for the heat storage material 9 to receive heat from the hottest gas during the discharge stage of the heat storage material 9, the direction of movement of the heat storage material 9 is more preferably opposite to the direction of movement of the hot gas. Also, preferably, the direction of movement of the heat storage material 9 is downward in the direction of gravity. Of course, the direction of movement of the heat storage material 9 in the movement path 15 and the direction of movement of the hot gas do not have to be parallel and can be changed in various ways.

[0038] Figure 6 shows a heat utilization system 2 that utilizes the heat storage device 1. The heat utilization system 2 includes the heat storage device 1, heat storage material tanks 21a and 21b, a heat dissipation device 22, and heat utilization equipment 23. In the heat storage device 1, heat is stored in the heat storage material 9. "Storing heat" means "heat storage," which is the accumulation of thermal energy. In the heat dissipation device 22, the heat storage material 9 releases heat. "Releasing heat" means "heat dissipation," which is the release of thermal energy. The heat storage material tanks 21a and 21b are tanks that store granular heat storage material 9 and are transportable. The heat storage material 9 in the heat storage material tank 21a is supplied to the storage section 162 in Figure 4 of the introduction section 16. Note that the heat storage material tank 21a itself may be the storage section 162. The heat storage material 9 may be supplied from the heat storage material tank 21a to the storage section 162 using a conveyor or the like.

[0039] The heat storage material tank 21b stores the heat storage material 9 discharged from the discharge section 17. For example, the heat storage material tank 21b is located below the opening 177 in Figure 5. The heat storage material 9 may be transported from below the opening 177 to the heat storage material tank 21b using a conveyor or the like. The heat storage material tank 21b is transported to the heat dissipation device 22 and connected to the heat dissipation device 22. When the heat storage material 9 is magnesium oxide, when water vapor is supplied to the heat storage material 9, the heat storage material 9 generates heat through the following hydration reaction. MgO + H2O → Mg(OH)2 + heat of reaction The extracted heat is used for hot water supply, air conditioning, etc., in the heat utilization equipment 23. When the heat storage material 9 is in a heat-releasing state, the heat storage material tank 21b is transported to the heat storage device 1 as the heat storage material tank 21a, and the heat-releasing heat storage material 9 is supplied to the introduction section 16.

[0040] The heat utilization system 2 enables the use of the heat recovered in the re-combustion chamber 34 of the incinerator 3 in the desired amount and at the desired time. Note that the storage and transport of the heat storage material 9 does not necessarily have to be in the heat storage material tanks 21a and 21b. Any container capable of holding the heat storage material 9 will suffice, such as a bag or container. Furthermore, the heat storage material 9 may be transported between the heat storage device 1 and the heat dissipation device 22 by means other than a container, for example, by a conveyor.

[0041] The water recovered from the heat storage material 9 in the heat storage device 1 (see Figure 4) may be used as water (water vapor) when releasing heat in the heat dissipation device 22. This allows for efficient heat utilization even in environments where water is scarce. If the distance between the heat storage device 1 and the heat dissipation device 22 is short, the water recovered in the heat storage device 1 may be guided to the heat dissipation device 22 via a water pipe.

[0042] Figure 7 is a cross-sectional view showing another example of the heat storage device 1 (re-combustion chamber 34). Components similar to those in Figure 3 are denoted by the same reference numerals. In the heat storage device 1, the entire space between the inner layer 11 and the outer layer 12 forms the transfer passage 15. The transfer passage 15 is a so-called jacket type. The structure of the introduction section 16 that guides the heat storage material 9 into the transfer passage 15 and the discharge section 17 that discharges the heat storage material 9 from the transfer passage 15 is the same as the structure described with reference to Figures 2, 4, and 5. In the heat storage device 1 of Figure 7, because the transfer passage 15 is wide, a large amount of heat from the exhaust gas flowing through the gas flow path 14 can be simultaneously supplied to the heat storage material 9.

[0043] Figure 8 shows another example of the inlet section 16. The structure of the inlet section 16 in Figure 8 is similar to the structure of the discharge section 17 in Figure 5. The inlet section 16 has an inlet pipe 161, a storage section 162, a blocking plate 164, a cover 165, and a moving mechanism 169. The inlet pipe 161 extends downward while inclined toward the upper end of the movement path 15. The lower end of the storage section 162 is an outlet 166 that opens downward in the direction of gravity. The outlet 166 discharges the heat storage material 9 guided from the storage section 162. The blocking plate 164 is a horizontal plate, and its upper surface is an opposing surface 167 facing the outlet 166. The space between the axis of the blocking plate 164 and the cover 165 is sealed with a gland seal or the like. The blocking plate 164 is moved by the moving mechanism 169.

[0044] The opposing surface 167 is positioned below the outlet 166 and spaced apart from it, facing the outlet 166. The opposing surface 167 holds the heat storage material 9 between itself and the outlet 166, preventing the heat storage material 9 from falling from the outlet 166. That is, the heat storage material 9 falling from the outlet 166 spreads out on the opposing surface 167 and accumulates in a mountain-like shape at approximately the angle of repose. However, when the height of the accumulated heat storage material 9 reaches the height of the outlet 166, the outlet 166 is blocked by the heat storage material 9, preventing the heat storage material 9 from falling and stopping it.

[0045] When dropping the heat storage material 9 from the discharge port 166, the moving mechanism 169 moves the opposing surface 167 horizontally, or moves the opposing surface 167 so that it is tilted (i.e., rotated), thereby breaking the holding state of the heat storage material 9. The holding state of the heat storage material 9 may also be broken by the downward movement of the opposing surface 167. As a result, the heat storage material 9 falls from the discharge port 166 and is supplied to the transport path 15 via the introduction pipe 161. By utilizing the opposing surface 167, the supply of the heat storage material 9 can be controlled with a simple structure.

[0046] A steam outlet 168 is provided at the top of the cover 165. Steam generated in the transport path 15 rises and is guided from the introduction pipe 161 to the steam outlet 168. The steam outlet 168 is connected to a heat exchanger 81, where heat is recovered from the steam and water obtained by the condensation of the steam is also recovered. In addition, air may be gently introduced into the transport path 15 from the lower end to assist in the rise of the steam.

[0047] The heat storage device 1 and heat utilization system 2 described above are merely examples, and various modifications are possible.

[0048] The direction in which the heat storage material 9 moves within the movement path 15 may be any direction. Preferably, it is downward in the direction of gravity (it may be inclined), and more preferably, downward in the vertical direction. Preferably, the heat storage material 9 moves within the movement path 15 due to gravity. Because the direction in which the heat storage material 9 moves within the movement path 15 is downward in the direction of gravity, the upper part of the heat storage material 9 within the movement path 15 also receives heat from the lower part of the heat storage material 9, so heat is stored efficiently and the discharge rate of the heat storage material 9 can be improved. In other words, the time required to store heat in a unit amount of heat storage material 9 can be shortened.

[0049] The shape of the transport path 15 can be changed in various ways. The cross-sectional shape of the transport path 15 can be various shapes such as circular, rectangular, or trapezoidal, and the area of ​​the cross-section does not need to be constant. For example, the cross-sectional area of ​​the transport path 15 may gradually increase or decrease along the direction of movement of the heat storage material 9. Furthermore, the direction of flow of the high-temperature gas and the direction of movement of the heat storage material 9 do not have to be parallel. The direction of movement of the heat storage material 9 in the transport path 15 is not limited to downward in the direction of gravity, but may be horizontal or inclined. Similarly, the direction of movement of the high-temperature gas in the gas flow path 14 may also be horizontal or inclined.

[0050] The control of the movement of the heat storage material 9 is not limited to the structures shown in Figure 5 and Figure 8. For example, the movement of the heat storage material 9 may be controlled using a general-purpose valve.

[0051] The materials of the inner layer 11, outer layer 12, intermediate layer 13, and casing 18 can be varied. The materials of these annular layers (they do not need to be strictly annular, but approximately annular) are appropriately selected according to the required heat resistance temperature. For example, if the inner layer 11 becomes hot enough to require fire resistance, the material of the inner layer 11 is preferably a sintered material such as ceramic.

[0052] The inner layer 11, outer layer 12, intermediate layer 13, and casing 18 do not necessarily have to be single layers, but may be multi-layered. For example, the casing 18 may be formed by an inner layer whose material is selected according to the temperature of the outer layer 12, and an outer layer made of metal. If the outer layer 12 can also perform the function of the casing 18, the casing 18 may be omitted. The inner layer 11, outer layer 12, and intermediate layer 13 do not need to be clearly distinguished, and it is sufficient if there are layers that can be roughly understood as the inner layer 11, outer layer 12, and intermediate layer 13. As illustrated in Figure 7, the intermediate layer 13 may be substantially absent. In this case, the layer of heat storage material 9 may function as an insulating layer.

[0053] The shape of the re-combustion chamber 34 in a cross-section perpendicular to the direction of gas flow is not limited to a circle, but may be rectangular or polygonal. Furthermore, it may be honeycomb-shaped with multiple gas flow paths arranged in parallel.

[0054] The re-combustion chamber 34 of the incinerator 3 reaches extremely high temperatures (800-1000°C), making it suitable for the installation of a heat storage device 1 that does not utilize a heat transfer medium. However, the heat storage device 1 may be installed in a high-temperature gas flow path other than the re-combustion chamber 34. The heat storage device 1 may be installed upstream or downstream of the re-combustion chamber 34 of the incinerator 3. The heat storage device 1 may be installed in equipment other than the incinerator 3. Preferably, the heat storage device 1 is installed in a flow path through which exhaust gas generated in the combustion device flows. Combustion devices include, for example, incinerators in waste incineration facilities, thermal power generation equipment, and plants that utilize heat from combustion. The high-temperature gas is not limited to exhaust gas, and the heat storage device 1 may be installed in equipment other than the combustion device.

[0055] Parts of the introduction section 16 and the discharge section 17 may also serve as part of the section forming the transport path 15. In other words, the transport path 15, introduction section 16, and discharge section 17 do not need to be clearly distinguishable structural parts; any section that can be roughly understood as the transport path 15, introduction section 16, and discharge section 17 is sufficient. The structure for supplying and discharging the heat storage material 9 to and from the transport path 15 is not limited to those described above, and may include a conveyor, a drop pipe, various other things, or a combination thereof.

[0056] When heat storage and release are performed using water vapor, a small amount of gas (air) may be supplied from the bottom to the top of the transport path 15 in order to efficiently discharge the water vapor.

[0057] As already explained, the heat storage material 9 may be a heat storage material other than a chemical heat storage material, such as a latent heat storage material or an adsorbent that adsorbs water vapor, such as zeolite or hask clay. When PCM capsules are used as the latent heat storage material, handling of water vapor becomes unnecessary.

[0058] When the heat storage material 9 is a chemical heat storage material, it can generally be described as a material that stores heat through the dehydration reaction of an alkaline earth metal hydroxide and releases heat through the hydration reaction of the oxide of the alkaline earth metal. The alkaline earth metal contained in the heat storage material 9 is not limited to magnesium. Preferably, the heat storage material 9 contains at least one selected from the group consisting of magnesium and calcium. Other alkaline earth metals besides magnesium and calcium can also be used.

[0059] The shape of the individual particles of the heat storage material 9 (hereinafter referred to as "heat storage material particles") is preferably a so-called "pellet shape". For example, the heat storage material particles are cylindrical with a diameter of 1 mm to 10 mm and a length of 1 mm to 10 mm. More preferably, they are cylindrical with a diameter of 1 mm to 5 mm and a length of 1 mm to 5 mm. The heat storage material particles may also be spherical with a diameter of 1 mm to 10 mm. Preferably, the heat storage material particles are spherical with a diameter of 1 mm to 5 mm. The shape of the heat storage material particles may also be other shapes such as a rectangular parallelepiped.

[0060] The configurations in the above embodiments and each modified example may be combined as appropriate, as long as they do not contradict each other. [Explanation of symbols]

[0061] 1 Heat storage device 3. Incinerator (combustion device) 9. Heat storage material 11 Inner Layer 12 Outer layer 14 ガス flow path 15 moving path 16. Import Section 17 Discharge section 34 Re-combustion Chamber 174 Discharge outlet 175 facing each other 176 Mobile mechanisms

Claims

1. A heat storage device that stores heat in granular heat storage material, An annular inner layer that forms a gas channel through which high-temperature gas flows, An annular outer layer covering the outer circumference of the inner layer, An introduction section for introducing a heat storage material in a heat-dissipating state into a transfer path, which is a space isolated from the gas flow path located between the inner layer and the outer layer, A discharge section for discharging the heat storage material, which has entered a heat storage state due to the transfer of heat from the high-temperature gas through the inner layer while moving within the aforementioned transport path, A heat storage device equipped with the following features.

2. A heat storage device according to claim 1, The aforementioned high-temperature gas is the exhaust gas generated in the combustion device, which is used in the heat storage device.

3. A heat storage device according to claim 1, A heat storage device in which the inner layer is formed of a fire-resistant material.

4. A heat storage device according to claim 1, The aforementioned inner layer is the inner wall portion of the recombustion chamber of the incinerator, in this heat storage device.

5. A heat storage device according to claim 1, A heat storage device in which the heat storage material moves by gravity within the aforementioned transport path.

6. A heat storage device according to claim 1, A heat storage device in which the direction of movement of the heat storage material in the transfer path is parallel to the direction of movement of the high-temperature gas in the gas flow path.

7. A heat storage device according to claim 1, The aforementioned discharge unit, An outlet that opens downward in the direction of gravity and discharges the heat storage material from the transport path, An opposing surface is positioned below the discharge port at a distance from it, and by facing the discharge port, it prevents the heat storage material from falling out of the discharge port by accumulating and holding the heat storage material between itself and the discharge port, A moving mechanism that moves the opposing surfaces to disrupt the holding state of the heat storage material, thereby causing the heat storage material to fall from the discharge port, A heat storage device equipped with the following features.

8. A heat storage device according to any one of claims 1 to 7, A heat storage device in which the heat storage material is a chemical heat storage material.

9. A heat storage device according to any one of claims 1 to 7, A heat storage device in which the heat storage material is a latent heat storage material.

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