Chemical heat storage reactor

Abstract

To provide a chemical heat storage reactor which can suppress a delay of a heat radiation operation using a hydration reaction of a chemical heat storage material.SOLUTION: A chemical heat storage reactor 21 comprises: a chemical heat storage material HM for storing heat by a dehydration reaction, and radiating heat by a hydration reaction; a first heat exchanger 22 provided so as to be exchangeable in heat with the chemical heat storage material HM; and a first vessel 23 having a heat storage chamber 23a in which the chemical heat storage material HM and the first heat exchanger 22 are arranged. The first heat exchanger 22 has a plurality of flow passage pipes FT, a first connection flow passage pipe FT1 for connecting first end parts FTa out of the first end parts FTa and second end parts FTb being both end parts of the plurality of flow passage pipes FT, and a second connection flow passage pipe FT2 for connecting the second end parts FTb. The first vessel 23 has: a flow-in part 23b for making a heat medium flow into the first connection flow passage pipe F1; and a flow-out part 23c for making the heat medium flow out of the second connection flow passage pipe FT2. The chemical heat storage reactor 21 further comprises a heat transmission passage part 25 for transmitting heat to the first vessel 23 from the first heat exchanger 22.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to chemical heat storage reactors. [Background technology]

[0002] As described in Patent Document 1 and Patent Document 2, a chemical heat storage reactor is known that includes a chemical heat storage material, a heat exchanger that is provided so as to be able to exchange heat with the chemical heat storage material, and a container having a heat storage chamber in which the chemical heat storage material and the heat exchanger are arranged. The chemical heat storage material stores heat by a dehydration reaction. The chemical heat storage material releases heat by a hydration reaction. Patent Document 2 describes a technology that prevents condensation liquid generated on the inner surface of the container of the chemical heat storage reactor from adhering to the heat exchanger. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-158299 A [Patent Document 2] JP 2017-015329 A Summary of the Invention [Problem to be solved by the invention]

[0004] As described in Patent Document 2, the water vapor supplied to the container for a hydration reaction with the chemical heat storage material may condense on the inner surface of the container of the chemical heat storage reactor. Such condensation of water vapor may hinder the supply of water vapor to the chemical heat storage material, which may delay the heat dissipation operation utilizing the hydration reaction of the chemical heat storage material. [Means for solving the problem]

[0005] The chemical heat storage reactor that solves the above problem is a chemical heat storage reactor comprising: a chemical heat storage material that stores heat through a dehydration reaction and releases heat through a hydration reaction; a heat exchanger that is arranged to be able to exchange heat with the chemical heat storage material; and a container having a heat storage chamber in which the chemical heat storage material and the heat exchanger are arranged, wherein the heat exchanger has a plurality of flow path pipes, and of first ends and second ends which are both ends of the plurality of flow path pipes, a first connecting flow path pipe that connects the first ends and a second connecting flow path pipe that connects the second ends, and the container has an inlet portion that flows a heat medium into the first connecting flow path pipe and an outlet portion that flows the heat medium out of the second connecting flow path pipe, and further comprises a heat transfer path portion that transfers heat from the heat exchanger to the container.

[0006] According to this configuration, the heat of the heat exchanger can be transferred to the container by the heat transfer path. Therefore, the heat of the heat exchanger can be used to promote an increase in the temperature of the container. As a result, when water vapor is supplied into the container during the heat dissipation operation, it is possible to suppress condensation of water vapor on the inner surface of the container. Effect of the Invention

[0007] The present disclosure exhibits the effect of making it possible to suppress delays in the heat dissipation operation utilizing the hydration reaction of a chemical heat storage material. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a chemical heat storage system in a first embodiment. [Diagram 2] FIG. 2 is a schematic diagram illustrating the heat storage operation of the chemical heat storage system. [Diagram 3] FIG. 3 is a schematic diagram illustrating the regenerative operation of the chemical heat storage system. [Figure 4] FIG. 4 is a schematic diagram illustrating the first heat dissipation operation of the chemical heat storage system. [Diagram 5] FIG. 5 is a schematic diagram illustrating the second heat dissipation operation of the chemical heat storage system. [Figure 6] FIG. 6 is a vertical cross-sectional view showing a chemical heat storage reactor. [Figure 7] FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. [Figure 8] FIG. 8 is a vertical cross-sectional view showing the chemical heat storage reactor of the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. [Figure 11] FIG. 11 is a schematic diagram showing a chemical heat storage reactor of the third embodiment. [Figure 12] FIG. 12 is a schematic diagram showing a state in which the first liquid delivery channel is used. [Figure 13] FIG. 13 is a schematic diagram showing a state in which the second liquid supply channel is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (First embodiment) Hereinafter, a first embodiment of the chemical heat storage reactor will be described with reference to the drawings. First, the configuration and operation of a chemical heat storage system using a chemical heat storage reactor will be described.

[0010] <Overall configuration of chemical heat storage system> 1, the chemical heat storage system 11 includes a chemical heat storage reactor 21, a recovery vessel 31, a condenser 41, an evaporator 51, and an ejector EJ. The chemical heat storage system 11 can be used as a chemical heat pump that stores heat from an exhaust heat source HS and then releases heat at a temperature higher than that of the exhaust heat source HS. The chemical heat storage system 11 can send water vapor to a heating target 61 during heat release operation.

[0011] <Outline of chemical heat storage reactor> The chemical heat storage reactor 21 has a chemical heat storage material HM that undergoes a dehydration reaction during the heat storage operation of the chemical heat storage system 11 and a hydration reaction during the heat dissipation operation of the chemical heat storage system 11. The chemical heat storage material HM includes, for example, particles of a chemical heat storage material having deliquescent properties. The chemical heat storage material HM may be composed of only the chemical heat storage material, or may be a material in which particles of the chemical heat storage material are bound with a water vapor permeable binder such as a water vapor permeable resin. Examples of the chemical heat storage material include alkaline earth metal halides. One type of chemical heat storage material HM may be used, or multiple types may be used in combination.

[0012] The dehydration and hydration reactions of calcium chloride, which is a type of chemical heat storage material, are represented by, for example, the following formula (A). CaCl2·H2O+H2O⇔CaCl2·2H2O···(A) The chemical heat storage reactor 21 includes a first heat exchanger 22 that is provided so as to be able to exchange heat with the chemical heat storage material HM. The chemical heat storage reactor 21 generates saturated steam in a flow path of the first heat exchanger 22 by utilizing heat generated from the chemical heat storage material HM. The chemical heat storage reactor 21 includes a first container 23. The first container 23 of the chemical heat storage reactor 21 is configured so as to be able to introduce water vapor used in the hydration reaction of the chemical heat storage material HM. In addition, the first container 23 of the chemical heat storage reactor 21 is configured so as to discharge water vapor generated by the dehydration reaction of the chemical heat storage material HM.

[0013] Examples of the first heat exchanger 22 of the chemical heat storage reactor 21 include a fin-tube type heat exchanger, a finless heat exchanger, etc. As for the heat exchanger described below, a similar heat exchanger can be used unless otherwise specified.

[0014] <Collector> The recovery device 31 has an absorbent material LM that absorbs water vapor. The recovery device 31 recovers water vapor generated from the chemical heat storage material HM of the chemical heat storage reactor 21 by the absorbent material LM. The recovery device 31 includes a second heat exchanger 32 that exchanges heat with the absorbent material LM, and a second container 33 that accommodates the absorbent material LM and the second heat exchanger 32.

[0015] The absorbent LM is used to lower the temperature at which the chemical heat storage material HM undergoes a dehydration reaction. By using the absorbent LM, it is possible to advance the dehydration reaction of the chemical heat storage material HM and store heat even with exhaust heat at a lower temperature. A substance capable of undergoing a dehydration reaction at the temperature of the exhaust heat source HS is used as the absorbent LM. This makes it possible to regenerate the absorbent LM by utilizing the heat of the exhaust heat source HS.

[0016] The equilibrium vapor pressure VP2C of the absorbent LM at the temperature of the cooling source CS is lower than the equilibrium vapor pressure VP1H of the chemical heat storage material HM at the temperature of the exhaust heat source HS, so that the dehydration reaction of the chemical heat storage material HM can be favorably promoted. On the other hand, it is preferable that the equilibrium vapor pressure VP2H of the absorbent LM at the temperature of the exhaust heat source HS is higher than the equilibrium vapor pressure VP1H of the chemical heat storage material HM at the temperature of the exhaust heat source HS. Since such an absorbent LM is easier to dehydrate than the chemical heat storage material HM, it can be efficiently used for the next heat storage operation by regenerating the absorbent LM using the exhaust heat source HS. In addition, it is preferable that the equilibrium vapor pressure VP2H of the absorbent LM at the temperature of the exhaust heat source HS is higher than the equilibrium vapor pressure VP3C of water at the temperature of the cooling source CS. As a result, the absorbent LM can be efficiently regenerated by condensing the water vapor generated by heating the absorbent LM with the exhaust heat source HS by cooling with the cooling source CS.

[0017] Examples of the absorbent LM include zeolite, lithium hydroxide, magnesium sulfate, strontium bromide, activated carbon, porous metal complexes (MOF), etc. The absorbent LM may be used alone or in combination of two or more kinds.

[0018] The dehydration and hydration reactions of strontium bromide, which is one type of absorbent material LM, are represented, for example, by the following formula (B). SrBr2·H2O+5H2O⇔SrBr2·6H2O···(B) <Condenser> The condenser 41 condenses the water vapor generated from the absorbent LM. The condenser 41 also cools the recovery device 31. The condenser 41 includes a third heat exchanger 42 through which a cooling medium supplied from a cooling source CS flows, and a third container 43 that houses the third heat exchanger 42. The third heat exchanger 42 cools the water vapor flowing into the third container 43 of the condenser 41, thereby condensing it.

[0019] The condenser 41 is configured to supply water to the second heat exchanger 32 of the recovery device 31. The condenser 41 is configured to receive water that has passed through the second heat exchanger 32 of the recovery device 31. The condenser 41 has, for example, a nozzle 44 provided in a third container 43. The nozzle 44 can eject the water that has passed through the second heat exchanger 32 of the recovery device 31 into the third container 43. In the third container 43, the water may be cooled by utilizing flash evaporation of the water ejected from the nozzle 44. By setting the pressure condition in the third container 43 to a pressure condition lower than the equilibrium vapor pressure at the temperature of the water that has passed through the second heat exchanger 32 of the recovery device 31, the water can be cooled by utilizing flash evaporation.

[0020] <Evaporator> The evaporator 51 supplies water vapor to be reacted with the chemical heat storage material HM to the chemical heat storage reactor 21. The evaporator 51 includes a fourth heat exchanger 52 to which a heating medium is supplied from the exhaust heat source HS, and a fourth container 53 that accommodates the fourth heat exchanger 52. The fourth heat exchanger 52 of the evaporator 51 generates water vapor by heating water W1, which is an evaporation fluid. The evaporator 51 is preferably configured so that the water W2 of the condenser 41 can be delivered through a flow path not shown. This allows the water W2 of the condenser 41 to be reused as the water W1 of the evaporator 51. The evaporator 51 can also be configured so that water can be supplied from the outside.

[0021] <Ejector> The ejector EJ supplies the water vapor supplied from the evaporator 51 to the chemical heat storage reactor 21. The ejector EJ pressurizes the water vapor supplied from the evaporator 51 by using driving steam supplied from the outside. The ejector EJ is equipped with a nozzle, a diffuser, and the like. As the driving steam for the ejector EJ, for example, a part of the steam generated in the boiler B can be used. As the boiler B, for example, a boiler that is already installed for another purpose in a facility such as a factory can be used. The driving steam for the ejector EJ can also be supplied from an existing steam pipe.

[0022] <Flow path configuration> Next, a description will be given of a main flow path configuration of the chemical heat storage system 11. First, a description will be given of the flow paths used for the heat storage operation of the chemical heat storage system 11.

[0023] As shown in FIG. 2, the chemical heat storage system 11 has a recovery steam flow path L1 that sends steam WV1 from the chemical heat storage reactor 21 to the recovery device 31. The chemical heat storage system 11 has a reactor heating flow path L2 that sends water W1 heated in the evaporator 51 to the first heat exchanger 22 of the chemical heat storage reactor 21 by a pump 62, and a first evaporator flow path L3 that returns the water W1 through the first heat exchanger 22 to the evaporator 51. The chemical heat storage system 11 has a recovery device cooling flow path L4 that sends water W2 cooled in the condenser 41 to the second heat exchanger 32 of the recovery device 31 by a pump 63, and a first condenser flow path L5 that returns the water W2 through the second heat exchanger 32 to the condenser 41. In this way, between the condenser 41 and the recovery device 31, there is a flow path that allows the water W2 cooled in the condenser 41 to be circulated to the second heat exchanger 32 of the recovery device 31.

[0024] Next, the flow paths used in the regenerating operation of the chemical heat storage system 11 will be described. 3, the chemical heat storage system 11 has a second condenser flow path L6 that sends water vapor WV2 from the recovery device 31 to the condenser 41. The chemical heat storage system 11 has a recovery device heating flow path L7 that sends the water W1 heated in the evaporator 51 to the second heat exchanger 32 of the recovery device 31 by a pump 62, and a second evaporator flow path L8 that returns the water W1 that has passed through the second heat exchanger 32 to the evaporator 51.

[0025] The chemical heat storage system 11 is configured to be switchable between the collector cooling flow path L4 shown in Fig. 2 and the collector heating flow path L7 shown in Fig. 3. This allows for alternately storing heat in the chemical heat storage material HM using the collector cooling flow path L4 and regenerating the absorbent material LM using the collector heating flow path L7. Note that the collector cooling flow path L4 and the collector heating flow path L7 can be switched between by opening and closing a valve.

[0026] Next, the flow paths used for the heat dissipation operation of the chemical heat storage system 11 will be described. As shown in Fig. 4, the chemical heat storage system 11 has a first water vapor flow path L9a for the reactor that sends the water vapor WV3 generated in the evaporator 51 to the chemical heat storage reactor 21. As shown in Fig. 5, the chemical heat storage system 11 has a second water vapor flow path L9b for the reactor that sends the water vapor WV3 generated in the evaporator 51 to the chemical heat storage reactor 21 using the ejector EJ. The second water vapor flow path for the reactor sends the water vapor WV4 pressurized by the ejector EJ to the chemical heat storage reactor 21.

[0027] The chemical heat storage system 11 includes a steam supply passage L10 that sends water vapor in the first heat exchanger 22 of the chemical heat storage reactor 21 to a heating target 61. The heating target 61 is not particularly limited. Examples of the heating target 61 include a steam generator.

[0028] <Operation of chemical heat storage system> Next, an example of the operation of the chemical heat storage system 11 will be described. (Heat storage operation of chemical heat storage system) As shown in FIG. 2, in the heat storage operation of the chemical heat storage system 11, the water vapor WV1 discharged from the chemical heat storage material HM of the chemical heat storage reactor 21 is recovered by the recovery device 31. In detail, the water vapor WV1 discharged from the chemical heat storage material HM of the chemical heat storage reactor 21 is sent to the recovery device 31 through the recovery water vapor flow path L1. The water W2 cooled in the condenser 41 is sent to the second heat exchanger 32 of the recovery device 31 through the recovery device cooling flow path L4. The water W2 sent to the second heat exchanger 32 of the recovery device 31 is returned to the condenser 41 through the condenser first flow path L5. The water W2 cooled in the condenser 41 in this way is circulated between the condenser 41 and the second heat exchanger 32 of the recovery device 31 through the recovery device cooling flow path L4 and the condenser first flow path L5.

[0029] The water vapor WV1 discharged from the chemical heat storage material HM of the chemical heat storage reactor 21 is sent to the recovery vessel 31, whereby a dehydration reaction of the chemical heat storage material HM is carried out. Here, as the dehydration reaction of the chemical heat storage material HM progresses, the temperature of the chemical heat storage material HM decreases. When the temperature of the chemical heat storage material HM becomes lower than the temperature of the heating medium of the exhaust heat source HS, the water W1 heated by the evaporator 51 is circulated between the first heat exchanger 22 of the chemical heat storage reactor 21 and the evaporator 51 through the reactor heating flow path L2 and the first evaporator flow path L3. The evaporator 51 can heat the water W1 by supplying the heating medium from the exhaust heat source HS to the fourth heat exchanger 52 of the evaporator 51.

[0030] As described above, the dehydration reaction of the chemical heat storage material HM is advanced by heating the chemical heat storage material HM in the chemical heat storage reactor 21 using the exhaust heat source HS. The heat storage operation of the chemical heat storage system 11 can be stopped by closing the valve between the chemical heat storage reactor 21 and the recovery vessel 31.

[0031] (Regeneration operation of chemical heat storage system) 3, in the regeneration operation of the chemical heat storage system 11, the water vapor WV2 discharged from the absorbent LM of the recovery device 31 is condensed by the condenser 41. In detail, the water vapor WV2 discharged from the absorbent LM of the recovery device 31 is sent to the condenser 41 through the second condenser flow path L6. A cooling medium is supplied from a cooling source CS to the third heat exchanger 42 of the condenser 41. The regeneration operation of the chemical heat storage system 11 can be stopped by closing the valve between the recovery device 31 and the condenser 41.

[0032] (Heat dissipation operation of chemical heat storage system) The heat dissipation operation of the chemical heat storage system 11 includes a first heat dissipation operation shown in FIG. 4 and a second heat dissipation operation shown in FIG. 5. In the first heat dissipation operation and the second heat dissipation operation, a heating medium is supplied from the exhaust heat source HS to the fourth heat exchanger 52 of the evaporator 51, thereby generating water vapor WV3 in the evaporator 51. In the first heat dissipation operation, the water vapor WV3 generated in the evaporator 51 is sent to the chemical heat storage reactor 21 through the first water vapor flow path L9a for the reactor. The second heat dissipation operation is performed after the first heat dissipation operation. In the second heat dissipation operation, the water vapor WV3 generated in the evaporator 51 is supplied to the ejector EJ. The ejector EJ sends water vapor WV4 obtained by pressurizing the water vapor WV3 to the chemical heat storage reactor 21.

[0033] The water in the flow path of the first heat exchanger 22 of the chemical heat storage reactor 21 is heated by heat generated by the hydration reaction of the chemical heat storage material HM. This makes it possible to generate water vapor in the flow path of the first heat exchanger 22. The water vapor in the flow path of the first heat exchanger 22 is sent to the heating target 61 through the steam supply flow path L10.

[0034] The heat dissipation operation of the chemical heat storage system 11 can be stopped by closing the valve between the evaporator 51 and the chemical heat storage reactor 21. In the chemical heat storage system 11, it is preferable to send the water W1 heated in the evaporator 51 to the first heat exchanger 22 of the chemical heat storage reactor 21 through the reactor heating flow path L2 before the heat dissipation operation.

[0035] <How to use the chemical heat storage system> The above-mentioned method of using the chemical heat storage system 11 includes a heat storage step of performing the heat storage operation, a regeneration step of performing the regeneration operation, and a heat dissipation step of performing the heat dissipation operation. The heat storage step and the heat dissipation step can be alternately repeated. The regeneration step can be performed after the heat storage step and before the next heat storage step is started. In the method of using the chemical heat storage system 11, it is possible to switch between a regeneration step of regenerating the absorbent material LM using the above-mentioned collector heating flow path L7 and a heat storage step of storing heat in the chemical heat storage material HM using the above-mentioned collector cooling flow path L4. The heat dissipation step of this embodiment includes a first heat dissipation step of performing the above-mentioned first heat dissipation operation and a second heat dissipation step of performing the above-mentioned second heat dissipation operation. In the method of using the chemical heat storage system 11, a reactor heating step of heating the first heat exchanger 22 of the chemical heat storage reactor 21 may be performed before the heat dissipation step. In the reactor heating step, as shown in FIG. 2, water W1 heated in the evaporator 51 is circulated between the first heat exchanger 22 of the chemical heat storage reactor 21 and the evaporator 51 through the reactor heating flow path L2 and the first evaporator flow path L3.

[0036] <Details of the chemical heat storage reactor> Next, the chemical heat storage reactor 21 will be described in detail. As shown in Fig. 6 and Fig. 7, the first heat exchanger 22 of the chemical heat storage reactor 21 has a plurality of flow tubes FT. The chemical heat storage material HM is disposed between adjacent flow tubes FT of the first heat exchanger 22. Each of the plurality of flow tubes FT has a first end FTa and a second end FTb which are both ends. The first heat exchanger 22 has a first connecting flow tube FT1 which connects the first end FTa of the plurality of flow tubes FT, and a second connecting flow tube FT2 which connects the second end FTb.

[0037] The first container 23 has a heat storage chamber 23a in which the chemical heat storage material HM and the first heat exchanger 22 are arranged. The first container 23 has an inflow section 23b through which the heat medium flows into the first connecting flow passage pipe FT1, and an outflow section 23c through which the heat medium flows out from the second connecting flow passage pipe FT2. The first container 23 is made of, for example, a metal wall. The first container 23 may have a metal wall and a heat insulating layer laminated on the outer surface of the metal wall.

[0038] The chemical heat storage reactor 21 further includes an outer container 24 that houses the first container 23, and an insulating space 24a between the first container 23 and the outer container 24. Examples of materials for the outer container 24 include metal and fiber-reinforced plastic. The insulating space 24a can be configured as a gas-filled section filled with a gas such as air, or a vacuum insulating section. From the viewpoint of further improving the insulating performance of the insulating space 24a, it is preferable that the insulating space 24a is configured as a vacuum insulating section. When the insulating space 24a is configured as a vacuum insulating section in this way, the outer container 24 has an exhaust section (not shown). The air in the insulating space 24a is exhausted to the outside of the outer container 24 through this exhaust section, and then the exhaust section is closed, whereby a vacuum insulating section can be provided. From the viewpoint of further improving the insulating performance, the pressure of the vacuum insulating section is preferably 100 Pa or less.

[0039] The chemical heat storage reactor 21 further includes a heat transfer path section 25 that transfers heat from the first heat exchanger 22 to the first container 23. The heat transfer path section 25 in this embodiment is composed of a heat conductive member 26 that connects the outer circumferential surface of the second connection flow path pipe FT2 and the inner surface of the first container 23. Examples of materials for the heat conductive member 26 include metal materials such as copper and stainless steel, ceramic materials such as aluminum nitride, and heat conductive resin materials. The heat conductive member 26 is connected to at least one of the inner surface of the side wall and the inner surface of the ceiling wall of the first container 23, for example.

[0040] There is no particular limitation on the shape of the thermally conductive member 26. Examples of the shape of the thermally conductive member 26 include a plate shape, a block shape, etc. The number of the thermally conductive members 26 may be one or more.

[0041] Next, an example of the operation and main actions of the chemical heat storage reactor 21 will be described. As shown in Fig. 2, for example, during the heat storage operation of the chemical heat storage reactor 21, a heat medium is circulated through the first heat exchanger 22 of the chemical heat storage reactor 21. At this time, as shown in Figs. 6 and 7, the chemical heat storage reactor 21 is provided with a heat transfer path section 25. According to this configuration, the heat of the first heat exchanger 22 can be transferred to the first container 23 by the heat transfer path section 25. Therefore, it is possible to promote an increase in the temperature of the first container 23 by utilizing the heat of the first heat exchanger 22. As a result, when water vapor WV3 is supplied into the first container 23 in the heat dissipation operation, it is possible to suppress condensation of the water vapor WV3 on the inner surface of the first container 23.

[0042] Furthermore, even if the chemical heat storage reactor 21 is not in a state of heat storage operation, by circulating a heat medium through the first heat exchanger 22 of the chemical heat storage reactor 21, it is possible to promote an increase in the temperature of the first container 23 using the heat of the first heat exchanger 22.

[0043] For example, when the first heat exchanger 22 is heated using an exhaust heat source HS of 80°C, the heat transfer path section 25 of the chemical heat storage reactor 21 can raise the temperature of the first container 23 to approximately 80°C. The first heat dissipation operation is performed by supplying water vapor WV3 generated using an exhaust heat source HS of 80°C into the first container 23 heated in this manner. At this time, the temperature difference between the temperature of the water vapor WV3 and the temperature of the inner surface of the first container 23 becomes smaller, so that condensation of the water vapor WV3 on the inner surface of the first container 23 can be suppressed.

[0044] When the chemical heat storage material HM contains calcium chloride as a chemical heat storage substance, in the first heat dissipation operation in which the water vapor WV3 is supplied to the first container 23, the temperature of the first heat exchanger 22 can be raised to about 140°C. Therefore, the heat transfer path portion 25 of the chemical heat storage reactor 21 can raise the temperature of the first container 23 to about 140°C. Subsequently, in the second heat dissipation operation, by using the ejector EJ, for example, water vapor WV4 pressurized to about 100 kPa can be supplied into the first container 23. The temperature at which the water vapor WV4 of about 100 kPa condenses is about 100°C. Therefore, by heating the first container 23 to a temperature of about 140°C by heat transfer from the heat transfer path portion 25 during the first heat dissipation operation, it is possible to prevent condensation of water vapor on the inner surface of the first container 23 during the second heat dissipation operation.

[0045] <Action and Effects> The operation and effects of this embodiment will be described. (1-1) The chemical heat storage reactor 21 includes a chemical heat storage material HM that stores heat by a dehydration reaction and releases heat by a hydration reaction, and a first heat exchanger 22 that is provided so as to be able to exchange heat with the chemical heat storage material HM. The first heat exchanger 22 includes a plurality of flow tubes FT, and a first connecting flow tube FT1 that connects the first end FTa and a second connecting flow tube FT2 that connects the second end FTb of the first end FTa and the second end FTb, which are both ends of the plurality of flow tubes FT. The chemical heat storage reactor 21 includes a first container 23 having a heat storage chamber 23a in which the chemical heat storage material HM and the first heat exchanger 22 are disposed. The first container 23 includes an inflow section 23b that flows the heat medium into the first connecting flow tube FT1, and an outflow section 23c that flows the heat medium out of the second connecting flow tube FT2. The chemical heat storage reactor 21 further includes a heat transfer path 25 that transfers heat from the first heat exchanger 22 to the first container 23 .

[0046] According to this configuration, as described above, it is possible to promote the increase in temperature of the first container 23 by utilizing the heat of the first heat exchanger 22. Therefore, when the water vapor WV3 is supplied into the first container 23 in the heat dissipation operation, it is possible to suppress the condensation of the water vapor WV3 on the inner surface of the first container 23. Therefore, it is possible to suppress the delay in the heat dissipation operation utilizing the hydration reaction of the chemical heat storage material HM.

[0047] (1-2) The heat transfer path portion 25 of the chemical heat storage reactor 21 is configured with a heat conductive member 26 that connects the outer peripheral surface of the second connecting flow path pipe FT2 of the first heat exchanger 22 and the inner surface of the first container 23. By configuring the heat transfer path portion 25 with the heat conductive member 26 in this manner, the heat transfer path portion 25 can have a relatively simple structure.

[0048] (1-3) The heat conductive member 26 is arranged to transfer heat from the second connecting flow path pipe FT2, not the first connecting flow path pipe FT1, to the first container 23. That is, the heat conductive member 26 transfers the heat of the heat medium after passing through the multiple flow path pipes FT of the first heat exchanger 22 to the first container 23. For this reason, it is possible to suppress the influence of the heat conductive member 26 on the heat exchange between the multiple flow path pipes FT of the first heat exchanger 22 and the chemical heat storage material HM. That is, during the heat storage operation, it is possible to suppress the influence of the heat transfer from the heat conductive member 26 to the inner surface of the first container 23 on the dehydration reaction of the chemical heat storage material HM during the heat storage operation.

[0049] (1-4) The chemical heat storage reactor 21 can be used for performing a first heat dissipation operation in which the water vapor WV3 is supplied into the first container 23, and a second heat dissipation operation in which the water vapor WV4 having a higher pressure than the water vapor WV3 is supplied into the first container 23. Here, the heat transfer path portion 25 of the chemical heat storage reactor 21 of this embodiment can also promote heat transfer from the first heat exchanger 22 heated by the chemical heat storage material HM during the first heat dissipation operation to the inner surface of the first container 23. For this reason, in the second heat dissipation operation, it is also possible to suppress condensation of the water vapor WV4 on the inner surface of the first container 23. Therefore, it is possible to suppress delays in the second heat dissipation operation.

[0050] (1-5) The chemical heat storage reactor 21 further includes an outer container 24 that houses the first container 23, and an insulating space 24a between the first container 23 and the outer container 24. In this case, it is possible to suppress the heat transferred from the heat transfer path 25 to the first container 23 from being dissipated to the outside. Therefore, in the heat dissipation operation, when water vapor WV3 is supplied into the first container 23, it is possible to further suppress condensation of the water vapor WV3 on the inner surface of the first container 23.

[0051] (1-6) The chemical heat storage system 11 includes a collector cooling flow path L4 that sends the water W2 cooled in the condenser 41 to the second heat exchanger 32 of the collector 31, and a collector heating flow path L7 that sends the water W1 heated in the evaporator 51 to the second heat exchanger 32 of the collector 31. The collector cooling flow path L4 and the collector heating flow path L7 are configured to be switchable. Note that the collector heating flow path L7 can also be changed so as to send the water vapor generated in the evaporator 51 to the second heat exchanger 32 of the collector 31.

[0052] In this case, the recovery device 31 can be cooled and heated by the water W2 passing through the recovery device cooling flow path L4, which is independent of the flow path of the cooling medium of the cooling source CS, and the water W1 passing through the recovery device heating flow path L7, which is independent of the flow path of the heating medium of the exhaust heat source HS. Therefore, in the second heat exchanger 32 of the recovery device 31, it is possible to prevent the heating medium of the exhaust heat source HS from mixing with the cooling medium of the cooling source CS. As a result, the system of the cooling source CS is not affected by the properties of the heating medium of the exhaust heat source HS. Also, in the second heat exchanger 32 of the recovery device 31, it is possible to prevent the cooling medium of the cooling source CS from mixing with the heating medium of the exhaust heat source HS. As a result, the system of the exhaust heat source HS is not affected by the properties of the cooling medium of the cooling source CS. Therefore, it is possible to maintain the system of the cooling source CS and the system of the exhaust heat source HS in an independent state at the site where the chemical heat storage system 11 is introduced.

[0053] (1-7) In the case where the heating medium of the exhaust heat source HS is supplied to the first heat exchanger 22 of the chemical heat storage reactor 21, the first heat exchanger 22 is affected by the properties and cleanliness of the heating medium of the exhaust heat source HS. As a result, for example, the maintenance of the first heat exchanger 22 may require a lot of work. In contrast, the chemical heat storage system 11 of this embodiment further includes a reactor heating flow path L2 that sends the water W1 heated by the evaporator 51 to the first heat exchanger 22 of the chemical heat storage reactor 21. In this case, it is easy to stabilize the properties and ensure the cleanliness of the water W1 supplied to the first heat exchanger 22 of the chemical heat storage reactor 21. As a result, for example, it is possible to reduce the work of maintaining the first heat exchanger 22 of the chemical heat storage reactor 21. Even when the water vapor generated by the evaporator 51 is supplied to the first heat exchanger 22 of the chemical heat storage reactor 21, the same action and effect can be obtained.

[0054] Second embodiment The second embodiment will be described focusing on the differences from the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[0055] 8 to 10, the chemical heat storage reactor 21 of the second embodiment differs from the chemical heat storage reactor 21 of the first embodiment in the configuration of the heat transfer path section 25. In addition, in Fig. 8 to 10, in order to make the configuration of the heat transfer path section 25 of the chemical heat storage reactor 21 easy to understand, the flow of the heat medium flowing out from the second connecting flow path pipe FT2 of the first heat exchanger 22 is indicated by an outline arrow, and the first heat exchanger 22 is omitted from the illustration.

[0056] The heat transfer path section 25 of this embodiment includes a heat transfer use flow path 27 provided between the second connection flow path pipe FT2 of the first heat exchanger 22 and the outlet portion 23c of the first container 23. The heat transfer use flow path 27 allows the heat medium flowing out from the second connection flow path pipe FT2 to flow along the inner surface of the first container 23. From the viewpoint of ensuring a wider heat transfer area between the inner surface of the first container 23 and the heat medium, the heat transfer use flow path 27 is preferably arranged to meander along the inner surface of the first container 23 as shown in FIG. 8. In this embodiment, the heat transfer use flow path 27 is arranged to meander along a pair of inner surfaces facing each other in the first container 23, but the arrangement of the heat transfer use flow path 27 can be changed depending on the shape of the first container 23, etc.

[0057] Examples of the outer circumferential shape in cross section of the flow passage pipe constituting the heat transfer flow passage 27 include a semicircular shape, a circular shape, an elliptical shape, and a polygonal shape. The outer circumferential shape in cross section of the flow passage pipe constituting the heat transfer flow passage 27 of this embodiment is a semicircular shape as shown in Fig. 10. This outer circumferential shape preferably has a flat portion that is, for example, a semicircular shape, a triangular shape, a rectangular shape, or the like. In this case, by arranging the flat portion of the flow passage pipe so as to contact the flat portion of the inner surface of the first container 23, it is possible to ensure a wider heat transfer area between the flow passage pipe constituting the heat transfer flow passage 27 and the first container 23.

[0058] The operation and effects of the second embodiment will be described. (2-1) The chemical heat storage reactor 21 of the second embodiment also provides the same effects as those described in sections (1-1), (1-3) to (1-5) of the first embodiment.

[0059] (2-2) The heat transfer path section 25 of the chemical heat storage reactor 21 of the second embodiment is configured by a heat transfer flow path 27 provided between the second connection flow path pipe FT2 and the outflow section 23c. The heat transfer flow path 27 allows the heat medium flowing out of the second connection flow path pipe FT2 of the first heat exchanger 22 to flow along the inner surface of the first container 23. In this case, for example, the heat transfer resistance between the heat of the heat medium flowing through the first heat exchanger 22 and the first container 23 can be reduced, so that the heat of the heat medium flowing through the first heat exchanger 22 can be efficiently transferred to the first container 23. This can further promote the rise in temperature of the first container 23. Therefore, it is possible to further suppress the condensation of the water vapor WV3 described above. Therefore, it is possible to further suppress the delay in the heat dissipation operation using the hydration reaction of the chemical heat storage material HM.

[0060] Third embodiment The third embodiment will be described focusing on the differences from the second embodiment. Configurations similar to those of the first and second embodiments are given the same reference numerals as those of the first and second embodiments, and descriptions thereof will be omitted.

[0061] As shown in FIG. 11, the chemical heat storage reactor 21 of the third embodiment includes a first liquid supply flow path L11 that connects the second connection flow path FT2 of the first heat exchanger 22 and the heat transfer flow path 27. The chemical heat storage reactor 21 of the third embodiment also includes a second liquid supply flow path L12 that causes the heat medium flowing through the second connection flow path FT2 of the first heat exchanger 22 to flow outside the first container 23 without flowing through the heat transfer flow path 27. As shown in FIG. 12 and FIG. 13, the chemical heat storage reactor 21 is configured to be able to switch between the first liquid supply flow path L11 and the second liquid supply flow path L12. In FIG. 11 to FIG. 13, only the main components used in the heat storage operation are shown in a schematic manner.

[0062] For example, when the temperature of the first container 23 is lower than the temperature of the heat medium during the heat storage operation, the heat medium can be circulated through the heat transfer flow path 27 using the first liquid supply flow path L11 as shown in Fig. 12. Also, when the temperature of the first container 23 is higher than the temperature of the heat medium during the heat storage operation, the second liquid supply flow path L12 can be used as shown in Fig. 13. Note that switching between the first liquid supply flow path L11 and the second liquid supply flow path L12 can be performed by opening and closing a valve.

[0063] The operation and effects of the third embodiment will be described. (3-1) The chemical heat storage reactor 21 of the third embodiment also provides the same effects as those described in sections (2-1) and (2-2) of the second embodiment.

[0064] (3-2) The chemical heat storage reactor 21 of the third embodiment is configured to be switchable between a first liquid supply flow path L11 that sends the heat medium flowing through the second connecting flow path pipe FT2 to the heat transfer flow path 27 and a second liquid supply flow path L12 that causes the heat medium to flow out of the first container 23 without flowing through the heat transfer flow path 27. In this case, when the temperature of the first container 23 is higher than the temperature of the heat medium flowing through the first heat exchanger 22, the second liquid supply flow path L12 can be used to prevent the heat medium from flowing into the heat transfer flow path 27. Therefore, by heating the first container 23 using the heat medium flowing through the heat transfer flow path 27 only when necessary, it is possible to maintain the temperature of the inner surface of the first container 23 at an appropriate temperature.

[0065] <Example of change> The above embodiment may be modified as follows: The above embodiment and the following modified examples may be implemented in combination with each other to the extent that there is no technical contradiction.

[0066] The chemical heat storage reactor 21 is used for performing the first heat dissipation operation and the second heat dissipation operation as the heat dissipation operation, but can also be used for performing only the first heat dissipation operation. In the above-mentioned chemical heat storage reactor 21, the heat transfer path section 25 is arranged to transfer heat from the second connecting passage pipe FT2 to the first container 23, but it can also be arranged to transfer heat from the first connecting passage pipe FT1 to the first container 23. That is, the heat conductive member 26 of the first embodiment can be changed to a heat conductive member that connects the outer circumferential surface of the first connecting passage pipe FT1 and the inner surface of the first container 23. Also, the heat transfer use flow path 27 of the second embodiment can be changed to a heat transfer use flow path provided between the inlet portion 23b and the first connecting passage pipe FT1. In this modified example, the heat transfer use flow path flows the heat medium flowing out from the first connecting passage pipe FT1 along the inner surface of the first container 23.

[0067] In the above-mentioned chemical heat storage reactor 21, the outer vessel 24 may be omitted. In the third embodiment, the valve for switching between the first liquid supply flow path L11 and the second liquid supply flow path L12 is disposed inside the first container 23, but the valve can also be disposed outside the first container 23. That is, the valve can be disposed between the first container 23 and the outer container 24, or can be disposed outside the outer container 24.

[0068] In the above-described chemical heat storage system 11, as shown in FIG. 2, the water W1 heated in the evaporator 51 is supplied to the first heat exchanger 22 of the chemical heat storage reactor 21. However, the system can be modified so that the heating medium of the exhaust heat source HS is supplied to the first heat exchanger 22 of the chemical heat storage reactor 21.

[0069] 3, the chemical heat storage system 11 is provided with a recovery device heating flow path L7 that sends the water W1 heated in the evaporator 51 to the second heat exchanger 32 of the recovery device 31, but this flow path may be omitted. In other words, the system may be modified so that the heating medium of the exhaust heat source HS is supplied to the second heat exchanger 32 of the recovery device 31.

[0070] In the heat storage operation of the above-mentioned chemical heat storage system 11, the recovery of the water vapor WV1 generated from the chemical heat storage material HM can also be performed using the condenser 41 and the recovery device 31. That is, in the above-mentioned heat storage method, the heat storage step of performing a dehydration reaction of the chemical heat storage material HM may include a condenser operation step and a recovery device operation step performed after the condenser operation step. In the condenser operation step, the water vapor WV1 generated from the chemical heat storage material HM is introduced into the condenser 41. In the recovery device operation step, the water vapor WV1 generated from the chemical heat storage material HM is introduced into the recovery device 31.

[0071] The chemical heat storage reactor 21 can also be used in a chemical heat storage system other than the chemical heat storage system 11. [Explanation of symbols]

[0072] 21...Chemical heat storage reactor 22...First heat exchanger 23...First container 23a...Heat storage chamber 23b...Inflow part 23c...Outflow part 24...Outer container 24a…Insulated space 25…Heat transfer path 26...Heat conductive material 27...Heat transfer channel FT...Flow pipe FTa...first end FTb…Second end FT1: First connecting pipe FT2: Second connecting pipe HM…Chemical heat storage material L11: First liquid supply channel L12: Second liquid supply channel

Claims

1. A chemical heat storage material that stores heat through a dehydration reaction and releases heat through a hydration reaction; A heat exchanger that is capable of exchanging heat with the chemical heat storage material; A chemical heat storage reactor comprising: a container having a heat storage chamber in which the chemical heat storage material and the heat exchanger are arranged; The heat exchanger includes a plurality of flow tubes, a first connecting flow passage pipe connecting the first end portions of the plurality of flow passage pipes, the first end portions being first end portions and second end portions being second end portions; a second connecting flow passage pipe connecting the second end portions, The container has an inlet portion through which a heat medium flows into the first connecting flow passage pipe; an outlet portion through which the heat medium flows out from the second connecting flow passage pipe, The chemical heat storage reactor further comprises a heat transfer path portion that transfers heat from the heat exchanger to the container.

2. The chemical heat storage reactor according to claim 1 , wherein the heat transfer path portion includes a thermally conductive member that connects an outer circumferential surface of the second connection flow passage pipe and an inner surface of the container.

3. 2. The chemical heat storage reactor according to claim 1, wherein the heat transfer path portion is provided between the second connecting flow path pipe and the outlet portion, and includes a heat transfer flow path through which the heat medium flowing out from the second connecting flow path pipe flows along an inner surface of the container.

4. 4. The chemical heat storage reactor according to claim 3, wherein the chemical heat storage reactor is configured to be switchable between a first liquid supply flow path that sends the heat medium circulating in the second connecting flow path to the heat transfer flow path and a second liquid supply flow path that causes the heat medium to flow outside the container without passing through the heat transfer flow path.

5. The chemical heat storage reactor of claim 1 , further comprising an outer vessel that houses the vessel, and an insulating space between the vessel and the outer vessel.

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