Condensers and chemical heat storage systems

Abstract

To provide a condenser that exercises the effect of stabilizing the cooling of water, and a chemical heat storage system.SOLUTION: A condenser 41 comprises: a condensing part 44 for condensing steam WV2; a cooling part 45 located on the lower side of the condensing part 44, and for cooling water, and a housing part 46 for housing the water cooled by the cooling part 45. The condensing part 44 and the cooling part 45 comprise a first flow passage 42 for circulating a cooling medium CM. The cooling part 45 comprising a second flow passage 45a for circulating the water W2. The second flow passage 45a is arranged so as to be adjacent to the first flow passage 42. The housing part 46 comprises a bottom wall part 46a and a peripheral wall part 46b. The peripheral wall part 46b comprises the cooling part 45.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a condenser and a chemical heat storage system. [Background technology]

[0002] As disclosed in Patent Documents 1 and 2, a chemical heat storage system is known that includes a heat storage device with a chemical heat storage material and a recovery device with an absorbent material that absorbs water vapor. The recovery device promotes the heat storage operation by recovering water vapor generated by a dehydration reaction of the chemical heat storage material in the heat storage device during the heat storage operation of the chemical heat storage system. A condenser is used to condense the water vapor discharged from the absorbent material of such a recovery device. The condenser includes a heat exchanger and a container that houses the heat exchanger. This condenser can also cool the water in the container, so it can also be used to cool the recovery device during the heat storage operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-220165 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-153029 Summary of the Invention [Problem to be solved by the invention]

[0004] In a condenser in which a heat exchanger is disposed inside a vessel to condense steam and cool water as described above, fluctuations in the water level inside the vessel cause changes in the contact area between the water and the heat exchanger, which can lead to unstable cooling of the water by the condenser. [Means for solving the problem]

[0005] A condenser that solves the above problem is a condenser comprising a condensing section that condenses water vapor, a cooling section that is located below the condensing section and cools water, and a storage section that stores the water cooled by the cooling section, wherein the condensing section and the cooling section have a first flow path through which a cooling medium flows, the cooling section has a second flow path through which water flows, the second flow path is arranged adjacent to the first flow path, and the storage section has a bottom wall section and a peripheral wall section, and the peripheral wall section comprises the cooling section.

[0006] This configuration ensures that the water flowing through the second flow path of the cooling unit can exchange heat with the cooling medium flowing through the first flow path of the cooling unit. Furthermore, since the peripheral wall of the storage unit is equipped with the cooling unit, the water in the storage unit is less susceptible to the effects of outside air. This makes it possible to stabilize the water temperature in the storage unit.

[0007] In the above condenser, the condenser unit may include a heat exchanger connected to the first flow path. With this configuration, heat exchange between the cooling medium and the water vapor is promoted, and the water vapor can be efficiently condensed.

[0008] In the condenser, the first flow path and the second flow path of the cooling part may be arranged to run parallel to each other and spiral around the peripheral wall part. With this configuration, it is possible to increase the efficiency of heat exchange between the cooling medium flowing through the first flow path and the water flowing through the second flow path, thereby efficiently cooling the water.

[0009] In the condenser, the cooling medium flowing through the first flow path and the water flowing through the second flow path of the cooling unit may flow in opposite directions. With this configuration, it is possible to increase the efficiency of heat exchange between the cooling medium flowing through the first flow path and the water flowing through the second flow path, thereby efficiently cooling the water.

[0010] In the above condenser, the first flow path of the cooling unit may be arranged on the circumferential wall of the accommodation unit so as to be more inward than the second flow path. With this configuration, a temperature rise of the water accommodated in the accommodation unit can be suppressed by the cooling medium flowing through the first flow path, which is arranged on the circumferential wall unit more inward than the second flow path.

[0011] In the above condenser, an inlet port through which the cooling medium flows into the first flow path may be connected to the condenser portion, and an outlet port through which the cooling medium flows out of the first flow path may be connected to the cooling portion. With this configuration, the condenser portion can be cooled preferentially over the cooling portion, thereby stabilizing the performance of the condenser portion.

[0012] One aspect of the chemical heat storage system that solves the above-mentioned problems is a chemical heat storage system that includes a heat accumulator having a chemical heat storage material that undergoes a dehydration reaction during a heat storage operation and a hydration reaction during a heat release operation and a heat exchanger that exchanges heat with the chemical heat storage material, a recovery device that has an absorbent material that absorbs water vapor and recovers water vapor generated from the chemical heat storage material, a condenser that condenses water vapor generated from the absorbent material, and an evaporator that supplies water vapor to the heat accumulator, wherein the recovery device has a heat exchanger that exchanges heat with the absorbent material, the evaporator has a heat exchanger to which a heating medium is supplied from an exhaust heat source, and a recovery device cooling device that sends water cooled by the condenser to the heat exchanger of the recovery device. and a collector heating flow path that sends water heated in the evaporator or water vapor generated in the evaporator to the heat exchanger of the collector, the collector cooling flow path and the collector heating flow path are configured to be switchable, the condenser has a condensing section that condenses water vapor, a cooling section located below the condensing section that cools water, and a storage section that stores water cooled by the cooling section, the condensing section and the cooling section have a first flow path through which a cooling medium flows, the cooling section has a second flow path through which water flows, the second flow path is arranged adjacent to the first flow path, the storage section has a bottom wall section and a peripheral wall section, and the peripheral wall section has the cooling section. [Effects of the Invention]

[0013] The present invention has the effect of stabilizing the cooling of water. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram showing a chemical heat storage system in a first embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating the heat storage operation of the chemical heat storage system. [Figure 3] FIG. 2 is a schematic diagram illustrating a regenerating operation of the chemical heat storage system. [Figure 4] FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 4. [Figure 7] FIG. 6 is a cross-sectional view showing a condenser in a second embodiment. [Figure 8] FIG. 10 is a cross-sectional view showing a condenser in a third embodiment. [Figure 9] FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 8. [Figure 10] FIG. 10 is a cross-sectional view showing a condenser in a fourth embodiment. [Figure 11] FIG. 10 is a cross-sectional view showing a condenser in a fifth embodiment. [Figure 12] FIG. 10 is a cross-sectional view showing a condenser in a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] (First embodiment) Hereinafter, a first embodiment of a condenser and a chemical heat storage system will be described with reference to the drawings.

[0016] <Overall configuration of chemical heat storage system> 1, the chemical heat storage system 11 includes a heat accumulator 21, a recovery device 31, a condenser 41, and an evaporator 51. The chemical heat storage system 11 can be used as a chemical heat pump that stores heat using a waste heat source HS and then releases heat at a temperature higher than that of the waste heat source HS. During the heat release operation of the chemical heat storage system 11, water vapor can be sent to a heating target 61.

[0017] <Heat storage device> The heat storage device 21 has a chemical heat storage material HM that undergoes a dehydration reaction during heat storage operation of the chemical heat storage system 11 and a hydration reaction during heat release operation of the chemical heat storage system 11. A well-known solid material can be used as the chemical heat storage material HM. The chemical heat storage material HM may be composed of only a chemical heat storage substance, or may be a material in which a particulate chemical heat storage substance is bound with a water vapor permeable binder such as a water vapor permeable resin. Examples of chemical heat storage materials include alkaline earth metal halides and calcium sulfate. One type of chemical heat storage material HM may be used, or multiple types may be used in combination.

[0018] The dehydration reaction and hydration reaction 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 heat accumulator 21 includes a first heat exchanger 22 that exchanges heat with the chemical heat storage material HM. The heat accumulator 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 heat accumulator 21 includes a first container 23 that accommodates the chemical heat storage material HM and the first heat exchanger 22. The first container 23 of the heat accumulator 21 is configured so that water vapor used in the hydration reaction of the chemical heat storage material HM can be introduced. Furthermore, the first container 23 of the heat accumulator 21 is configured so that water vapor generated in the dehydration reaction of the chemical heat storage material HM can be discharged.

[0019] Examples of the first heat exchanger 22 of the heat accumulator 21 include a fin-tube type heat exchanger and a finless heat exchanger. Note that similar heat exchangers can also be used for the heat exchangers described below.

[0020] <Collector> The recovery device 31 has an absorbent material LM that absorbs water vapor, and recovers the water vapor generated from the chemical thermal storage material HM of the heat accumulator 21. The recovery device 31 is equipped with 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.

[0021] The absorbent material LM is used to lower the temperature at which the dehydration reaction of the chemical heat storage material HM occurs. By using the absorbent material LM, it becomes possible to promote the dehydration reaction of the chemical heat storage material HM and store heat even with waste heat at a lower temperature. Furthermore, the absorbent material LM is made of a substance that can undergo a dehydration reaction at the temperature of the heating medium of the waste heat source HS. This allows the absorbent material LM to be regenerated using the waste heat source HS.

[0022] The equilibrium vapor pressure VP2C of the absorbent material 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, thereby suitably promoting the dehydration reaction of the chemical heat storage material HM. On the other hand, the equilibrium vapor pressure VP2H of the absorbent material LM at the temperature of the exhaust heat source HS is preferably higher than the equilibrium vapor pressure VP1H of the chemical heat storage material HM at the same temperature of the exhaust heat source HS. Such an absorbent material LM is easier to dehydrate than the chemical heat storage material HM, so by regenerating the absorbent material LM using the exhaust heat source HS, it can be efficiently used for the next heat storage operation. Furthermore, the equilibrium vapor pressure VP2H of the absorbent material LM at the temperature of the exhaust heat source HS is preferably higher than the equilibrium vapor pressure VP3C of water at the temperature of the cooling source CS. This allows the absorbent material LM to be efficiently regenerated by condensing the water vapor generated by heating the absorbent material LM with the exhaust heat source HS through cooling by the cooling source CS.

[0023] Examples of the absorbent material LM include zeolite, lithium hydroxide, magnesium sulfate, strontium bromine, activated carbon, and porous metal complexes (MOFs). One type of absorbent material LM may be used, or multiple types may be used in combination.

[0024] The dehydration reaction and hydration reaction of strontium bromide, which is one type of absorbent material LM, are represented by, for example, the following formula (B). SrBr2·H2O+5H2O⇔SrBr2·6H2O···(B) <Condenser> The condenser 41 condenses the water vapor generated from the absorbent material LM. The condenser 41 includes a first flow path 42 through which a cooling medium supplied from a cooling source CS flows, and a third container 43. The first flow path 42 of the condenser 41 condenses the water vapor introduced into the third container 43 of the condenser 41. The first flow path 42 of the condenser 41 also cools the water W2 flowing into the third container 43 of the condenser 41. Details of the structure of the condenser 41 of this embodiment will be described later.

[0025] <Evaporator> The evaporator 51 supplies water vapor to the heat accumulator 21 to be reacted with the chemical thermal storage material HM. 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 houses the fourth heat exchanger 52. The evaporator 51 can generate water vapor by heating the water W1 in the fourth container 53 with the fourth heat exchanger 52. The evaporator 51 is configured so that the water W2 of the condenser 41 can be delivered to it via a flow path not shown. As a result, the water W2 of the condenser 41 is reused as water W1 for the evaporator 51.

[0026] <Flow path configuration> Next, the main flow path configuration of the chemical heat storage system 11 will be described. First, the flow paths used for the heat storage operation of the chemical heat storage system 11 will be described.

[0027] 2, the chemical heat storage system 11 has a water vapor recovery flow path L1 that sends water vapor WV1 from the heat accumulator 21 to the recovery device 31. The chemical heat storage system 11 has a heat accumulator heating flow path L2 that sends water W1 heated in the evaporator 51 to the first heat exchanger 22 of the heat accumulator 21 by a pump 71, and a first evaporator flow path L3 that returns the water W1 that has passed 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 72, and a first condenser flow path L5 that returns the water W2 that has passed through the second heat exchanger 32 to the condenser 41.

[0028] Next, the flow paths used in the regenerating operation of the chemical heat storage system 11 will be described. As shown in Fig. 3, the chemical heat storage system 11 has a second condenser flow path L6 that sends water vapor WV2 from the collector 31 to the condenser 41. The chemical heat storage system 11 has a collector heating flow path L7 that sends water W1 heated in the evaporator 51 to the second heat exchanger 32 of the collector 31 by a pump 71, 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. The chemical heat storage system 11 is configured so that the above-mentioned collector cooling flow path L4 and the collector heating flow path L7 can be switched. This allows for alternately storing heat in the chemical heat storage material HM using the above-mentioned collector cooling flow path L4 and regenerating the absorbent material LM using the collector heating flow path L7. Switching between the collector cooling flow path L4 and the collector heating flow path L7 can be performed by opening and closing a valve.

[0029] Next, the flow paths used for the heat dissipation operation of the chemical heat storage system 11 will be described. 1, the chemical heat storage system 11 has a heat accumulator water vapor flow path L9 that sends water vapor from the evaporator 51 to the heat accumulator 21. The chemical heat storage system 11 also has a steam supply flow path L10 that sends water vapor in the first heat exchanger 22 of the heat accumulator 21 to an object to be heated 61. The object to be heated 61 is not particularly limited. For example, the object to be heated 61 may be a steam generator or the like.

[0030] <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) 2, in the heat storage operation of the chemical heat storage system 11, water vapor WV1 discharged from the chemical heat storage material HM of the heat storage device 21 is recovered by the recovery device 31. In detail, the water vapor WV1 discharged from the chemical heat storage material HM of the heat storage device 21 is sent to the recovery device 31 through a recovery steam flow path L1. Water W2 cooled in the condenser 41 is sent to the second heat exchanger 32 of the recovery device 31 through a 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.

[0031] The water vapor WV1 discharged from the chemical heat storage material HM of the heat accumulator 21 is sent to the recovery device 31, whereby a dehydration reaction of the chemical heat storage material HM occurs. 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, water W1 heated in the evaporator 51 is circulated between the first heat exchanger 22 of the heat accumulator 21 and the evaporator 51 through the heat accumulator heating flow path L2 and the first evaporator flow path L3. In the evaporator 51, the water W1 can be heated by supplying the heating medium from the exhaust heat source HS to the fourth heat exchanger 52 of the evaporator 51.

[0032] 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 heat storage device 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 heat storage device 21 and the recovery device 31.

[0033] (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 a second condenser flow path L6. A cooling medium is supplied to a first flow path 42 of the condenser 41 from a cooling source CS. 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.

[0034] (Heat dissipation operation of chemical heat storage system) In the heat dissipation operation of the chemical heat storage system 11, 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 in the evaporator 51. The water vapor generated in the evaporator 51 is sent to the heat accumulator 21 through the heat accumulator water vapor flow path L9 shown in Fig. 1. This causes a hydration reaction of the chemical heat storage material HM in the heat accumulator 21.

[0035] The water in the flow path of the first heat exchanger 22 of the heat storage device 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 shown in Fig. 1. The heat dissipation operation of the chemical heat storage system 11 can be stopped by closing the valve between the evaporator 51 and the heat storage device 21.

[0036] 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 heat accumulator 21 through the heat accumulator heating flow path L2 before the heat dissipation operation. <Heat storage method> In the heat storage method using the above-described chemical heat storage system 11, it is possible to repeat a heat storage step in which a dehydration reaction of the chemical heat storage material HM is carried out, and a heat release step in which a hydration reaction of the chemical heat storage material HM is carried out. In the heat storage method, after the heat storage step, a regeneration step in which the absorbent material LM is regenerated is carried out before the start of the next heat storage step. In the heat storage method, a regeneration step in which the absorbent material LM is regenerated using the above-described recovery vessel heating flow path L7 and a heat storage step in which heat is stored in the chemical heat storage material HM using the above-described recovery vessel cooling flow path L4 are switched. It is preferable that the heat storage method includes a heat storage unit heating step in which the first heat exchanger 22 of the heat storage unit 21 is heated using the above-described heat storage unit heating flow path L2 before the heat release step.

[0037] <Details of condenser configuration and operation> As shown in Figure 4, the condenser 41 includes a condensation section 44 that condenses water vapor WV2, a cooling section 45 located below the condensation section 44 that cools water W2, and a storage section 46 that stores the water W2 cooled by the cooling section 45.

[0038] As shown in FIGS. 4 to 6, the condenser section 44 and the cooling section 45 have a first flow path 42 through which the cooling medium CM flows. As described above, the cooling medium CM is supplied to the first flow path 42 from the cooling source CS. More specifically, the third container 43 has a first inlet T1a and a first outlet T1b. The first inlet T1a is connected to the condenser section 44. The first outlet T1b is connected to the cooling section 45. The first flow path 42 flows the cooling medium CM through the condenser section 44 and then the cooling section 45. That is, the first flow path 42 flows the cooling medium CM downward.

[0039] 4, the third container 43 has a water vapor inlet portion 43a through which water vapor WV2 flows into the condenser portion 44. The water vapor WV2 that flows into the third container 43 from the water vapor inlet portion 43a is cooled by the cooling medium CM that flows through the first flow path 42 of the condenser portion 44. In this embodiment, the water vapor inlet portion 43a is provided on the top wall of the third container 43, but it may also be provided so as to penetrate the peripheral wall of the third container 43.

[0040] As shown in FIGS. 4 to 6, the cooling unit 45 has a second flow path 45a through which the water W2 flows. The second flow path 45a is disposed adjacent to the first flow path 42. More specifically, as shown in FIGS. 4 and 6, the third container 43 has a second inlet portion T2a through which the water W2 flows. The water W2 that flows in from the second inlet portion T2a and flows through the second flow path 45a flows into the storage unit 46. That is, the second flow path 45a causes the water W2 to flow upward.

[0041] As shown in FIGS. 4 to 6, the storage unit 46 has a bottom wall 46a and a peripheral wall 46b. The peripheral wall 46b includes the cooling unit 45. The second flow paths 45a of the cooling unit 45 are connected to the space above the storage unit 46. As a result, the water W2 that flows through the second flow paths 45a flows over the flow path wall that defines the second flow paths 45a and into the space inside the peripheral wall 46b. That is, the water W2 overflows from the second flow paths 45a and flows into the space inside the peripheral wall 46b. Note that a through-hole that connects the second flow paths 45a and the space inside the peripheral wall 46b may be provided in the upper part of the flow path wall that defines the second flow paths 45a. The water W2 that flows through the second flow paths 45a can also flow into the space inside the peripheral wall 46b through such a through-hole. In this way, the water W2 that has passed through the second flow path 45a is stored inside the peripheral wall portion 46b of the storage portion 46, i.e., inside the cooling portion 45. The storage portion 46 has a second outlet portion T2b through which the water W2 flows out. In this embodiment, the second outlet portion T2b is provided so as to penetrate the lower part of the peripheral wall portion 46b, but it may also be provided so as to penetrate the bottom wall portion 46a.

[0042] In the condenser 41 configured as described above, the water vapor WV2 that flows into the condenser section 44 is condensed by being cooled by the cooling medium CM flowing through the first flow path 42. The water condensed in the condenser section 44 flows down from the condenser section 44 to the cooling section 45. That is, the water condensed in the condenser section 44 can be used as water W2 in the cooling section 45. Furthermore, in the condenser 41, the water W2 flowing through the second flow path 45a is cooled by heat exchange with the cooling medium CM flowing through the first flow path 42. In the condenser 41, the water W2 cooled by the cooling medium CM can be stored in the storage section 46.

[0043] <Actions and Effects of the First Embodiment> The operation and effects of the first embodiment will be described. (1-1) In the condenser 41, the condensing section 44 and the cooling section 45 have a first flow path 42 through which the cooling medium CM flows. The cooling section 45 has a second flow path 45a through which the water W2 flows. The second flow path 45a is disposed adjacent to the first flow path 42. The accommodation section 46 of the condenser 41 has a bottom wall portion 46a and a peripheral wall portion 46b, and the peripheral wall portion 46b is provided with the cooling portion 45. With this configuration, the water W2 flowing through the second flow path 45a of the cooling section 45 can be reliably heat-exchanged with the cooling medium CM flowing through the first flow path 42 of the cooling section 45. Furthermore, because the peripheral wall portion 46b of the accommodation section 46 is provided with the cooling portion 45, the water W2 in the accommodation section 46 is less susceptible to the influence of outside air. This makes it possible to stabilize the water temperature in the accommodation section 46. Therefore, the cooling of the water W2 can be stabilized.

[0044] (1-2) The cooling medium CM circulating through the first flow path 42 of the cooling unit 45 flows downward. Meanwhile, the water W2 circulating through the second flow path 45a of the cooling unit 45 flows upward. That is, the cooling medium CM circulating through the first flow path 42 of the cooling unit 45 and the water W2 circulating through the second flow path 45a flow in opposite directions. In this case, the efficiency of heat exchange between the cooling medium CM circulating through the first flow path 42 and the water W2 circulating through the second flow path 45a can be increased, thereby efficiently cooling the water W2.

[0045] (1-3) The first inlet T1a through which the cooling medium CM flows into the first flow path 42 is connected to the condenser 44. The outlet through which the cooling medium CM flows from the first flow path 42 is connected to the cooler 45. In this case, the condenser 44 can be cooled preferentially over the cooler 45. This makes it possible to stabilize the performance of the condenser 44.

[0046] (1-4) The chemical heat storage system 11 includes 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, and a recovery device heating flow path L7 that sends water W1 heated in the evaporator 51 to the second heat exchanger 32 of the recovery device 31. The recovery device cooling flow path L4 and the recovery device heating flow path L7 are configured to be switchable.

[0047] According to this configuration, the collector 31 can be cooled and heated by water W2 flowing through the collector cooling flow path L4, which is independent from the cooling medium flow path of the cooling source CS, and water W1 flowing through the collector heating flow path L7, which is independent from the heating medium flow path of the exhaust heat source HS. Therefore, in the second heat exchanger 32 of the collector 31, mixing of the heating medium of the exhaust heat source HS with the cooling medium of the cooling source CS can be prevented. 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. Furthermore, in the second heat exchanger 32 of the collector 31, mixing of the cooling medium of the cooling source CS with the heating medium of the exhaust heat source HS can be prevented. 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 systems of the cooling source CS and the exhaust heat source HS in an independent state in the location where the chemical thermal storage system 11 is installed.

[0048] (1-5) The chemical heat storage system 11 further includes a heat accumulator heating flow path L2 that sends the water W1 heated in the evaporator 51 to the first heat exchanger 22 of the heat accumulator 21 before the heat dissipation operation. In this case, the first heat exchanger 22 of the heat accumulator 21 can be preheated before the heat dissipation operation, and therefore, during the heat dissipation operation, the heat generated from the chemical heat storage material HM can be efficiently transported.

[0049] (1-6) When the heating medium of the exhaust heat source HS is supplied to the first heat exchanger 22 of the heat accumulator 21, the first heat exchanger 22 is affected by the properties and cleanliness of the heating medium of the exhaust heat source HS. This may require time and effort for maintenance of the first heat exchanger 22, for example. In contrast, the chemical heat storage system 11 of this embodiment further includes a heat accumulator heating flow path L2 that sends the water W1 heated in the evaporator 51 to the first heat exchanger 22 of the heat accumulator 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 heat accumulator 21. This may reduce the time and effort required for maintenance of the first heat exchanger 22 of the heat accumulator 21, for example.

[0050] (Second embodiment) The second embodiment in which the condenser 41 is modified will be described, focusing on the differences from the first embodiment.

[0051] As shown in FIG. 7 , the second embodiment differs from the first embodiment in the configuration of the first flow path 42 and the second flow path 45a of the cooling unit 45 in the condenser 41. The first flow path 42 and the second flow path 45a of the cooling unit 45 of this embodiment are arranged to run parallel to each other. The first flow path 42 and the second flow path 45a of the cooling unit 45 are arranged to spirally surround the peripheral wall portion 46b. The cooling medium CM flowing through the first flow path 42 of the cooling unit 45 flows downward in a spiral. The water W2 flowing through the second flow path 45a of the cooling unit 45 flows upward in a spiral. The spiral first flow path 42 and the spiral second flow path 45a have flow path walls that extend at an angle in FIG. 7 , but the hatching of these flow path walls is omitted. As with FIG. 7 , the hatching of the flow path walls is also omitted in the following FIGS. 8 and 10 .

[0052] The operation and effects of the second embodiment will be described. (2-1) In the second embodiment, the same effects as those described in sections (1-1) to (1-6) of the first embodiment can be obtained.

[0053] (2-2) The first flow path 42 and the second flow path 45a of the cooling unit 45 are arranged to run parallel to each other and spiral around the peripheral wall portion 46b. In this case, the efficiency of heat exchange between the cooling medium CM flowing through the first flow path 42 and the water W2 flowing through the second flow path 45a can be increased, and the water W2 can be efficiently cooled.

[0054] (Third embodiment) The third embodiment, in which the condenser 41 is modified, will be described, focusing on the differences from the first embodiment.

[0055] 8 and 9, the first flow path 42 and the second flow path 45a of the cooling section 45 in the third embodiment are arranged to spirally surround the peripheral wall portion 46b, as in the second embodiment. The condenser 41 in this embodiment has a condenser section 44 connected to the first flow path 42. The water vapor WV2 that flows into the condenser section 44 is cooled by the cooling medium CM circulating through the third heat exchanger 81, thereby condensing. Examples of the third heat exchanger 81 include a fin-tube heat exchanger and a finless heat exchanger. From the viewpoint of promoting the downward flow of condensed water, the third heat exchanger 81 is preferably arranged so as to be open at the top and bottom.

[0056] The operation and effects of the third embodiment will be described. (3-1) In the third embodiment, the same effects as those described in sections (1-1) to (1-6) of the first embodiment and section (2-2) of the second embodiment can be obtained.

[0057] (3-2) The condensing section 44 of the condenser 41 includes the third heat exchanger 81, which promotes heat exchange between the cooling medium CM and the water vapor WV2, thereby enabling the water vapor WV2 to be efficiently condensed.

[0058] (Fourth embodiment) The fourth embodiment, in which the condenser 41 is modified, will be described, focusing on the differences from the first and second embodiments.

[0059] 10, in the condenser 44 of the fourth embodiment, of the flow path walls forming the first flow paths 42, the wall surfaces that come into contact with the water vapor WV2 are changed from flat surfaces to first uneven surfaces 44a. Note that in the condenser 44, of the flow path walls forming the first flow paths 42, the wall surfaces that come into contact with the cooling medium CM may be changed from flat surfaces to the first uneven surfaces. Also, in the condenser 44, of the flow path walls forming the first flow paths 42, both the wall surfaces that come into contact with the water vapor WV2 and the wall surfaces that come into contact with the cooling medium CM may be changed to the first uneven surfaces.

[0060] In the cooling section 45 of this embodiment, of the two wall surfaces of the partition wall separating the first flow path 42 and the second flow path 45a, the wall surface on the second flow path 45a side is changed from a flat surface to a second uneven surface 45b. Note that in the cooling section 45, of the two wall surfaces of the partition wall separating the first flow path 42 and the second flow path 45a, the wall surface on the first flow path 42 side may be changed from a flat surface to a second uneven surface. Also, in the cooling section 45, of the two wall surfaces of the partition wall separating the first flow path 42 and the second flow path 45a, both wall surfaces may be changed to the second uneven surface. In this embodiment, the first uneven surface 44a and the second uneven surface 45b are corrugated uneven surfaces, but they may also be changed to uneven surfaces with a shape other than a corrugated shape.

[0061] The operation and effects of the fourth embodiment will be described. (4-1) In the fourth embodiment, the same effects as those described in sections (1-1) to (1-6) of the first embodiment and section (2-2) of the second embodiment can be obtained.

[0062] (4-2) In the condenser 44, at least one of the wall surfaces in contact with the water vapor WV2 and the wall surface in contact with the cooling medium CM among the flow path walls forming the first flow path 42 can be configured with the first uneven surface 44a. This promotes heat exchange between the cooling medium CM and the water vapor WV2, thereby enabling the water vapor WV2 to be efficiently condensed.

[0063] (4-3) In the cooling unit 45, at least one of the two wall surfaces of the partition wall separating the first flow path 42 and the second flow path 45a can be configured as the second uneven surface 45b. This promotes heat exchange between the cooling medium CM and the water W2, thereby enabling the water W2 to be cooled efficiently.

[0064] (Fifth embodiment) The fifth embodiment, in which the condenser 41 is modified, will be described, focusing on the differences from the first embodiment.

[0065] 11 , a condenser 41 of the fifth embodiment differs from the first embodiment in the flow path configuration of a cooling section 45. The first flow paths 42 of the cooling section 45 of the first embodiment described above are arranged so as to be outside the second flow paths 45a on the peripheral wall portion 46b of the accommodation section 46. In contrast, the first flow paths 42 of the cooling section 45 of the fifth embodiment are arranged so as to be inside the second flow paths 45a on the peripheral wall portion 46b of the accommodation section 46. The second flow paths 45a have through flow paths T2c that penetrate the first flow paths 42, and water W2 that has flowed through the through flow paths T2c flows into the space inside the peripheral wall portion 46b.

[0066] The operation and effects of the fifth embodiment will be described. (5-1) In the fifth embodiment, the same effects as those described in sections (1-1) to (1-6) of the first embodiment can be obtained.

[0067] (5-2) The first flow path 42 of the cooling unit 45 is arranged to be more inward than the second flow path 45a on the peripheral wall portion 46b of the storage portion 46. In this case, the temperature rise of the water W2 stored in the storage portion 46 can be suppressed by the cooling medium CM flowing through the first flow path 42, which is arranged more inward than the second flow path 45a. Therefore, it is possible to more stably cool the water W2.

[0068] (Sixth embodiment) The sixth embodiment, in which the condenser 41 is modified, will be described, focusing on the differences from the first and fifth embodiments.

[0069] 12, the condenser 41 of the sixth embodiment differs from the first and fifth embodiments in the flow path configuration of the cooling unit 45. The first flow paths 42 of the cooling unit 45 in the sixth embodiment are disposed in both positions on the peripheral wall 46b of the accommodation unit 46, one on the inner side of the second flow paths 45a and the other on the outer side of the second flow paths 45a. The third container 43 has a pair of first inflow portions T1a through which the cooling medium CM flows into each of the first flow paths 42 located on both sides of the second flow path 45a. The third container 43 has a pair of first outflow portions T1b through which the cooling medium CM flows out from each of the first flow paths 42 located on both sides of the second flow path 45a.

[0070] The operation and effects of the sixth embodiment will be described. (6-1) In the sixth embodiment, the same effects as those described in sections (1-1) to (1-6) of the first embodiment and section (5-2) of the fifth embodiment can be obtained.

[0071] (6-2) The first flow passage 42 of the cooling unit 45 is disposed at positions on both sides of the second flow passage 45a on the peripheral wall portion 46b of the storage portion 46. In this case, it is possible to more efficiently cool the water W2 flowing through the second flow passage 45a.

[0072] (Example of change) The above embodiment may be modified as follows: The above embodiment and the following modifications may be implemented in combination with each other within the scope of technical compatibility.

[0073] In the condenser 41 of each of the above embodiments, the first inlet portion T1a through which the cooling medium CM flows into the first flow path 42 is connected to the condenser portion 44, and the first outlet portion T1b through which the cooling medium CM flows out from the first flow path 42 is connected to the cooling portion 45. This configuration is not limited to this, and the first inlet portion T1a through which the cooling medium CM flows into the first flow path 42 may be connected to the cooling portion 45, and the first outlet portion T1b through which the cooling medium CM flows out from the first flow path 42 may be connected to the condenser portion 44.

[0074] In the condenser 41 of each of the above embodiments, the cooling medium CM flowing through the first flow path 42 of the cooling unit 45 and the water W2 flowing through the second flow path 45a flow in opposite directions. However, this is not limited thereto, and the condenser 41 may be modified so that the cooling medium CM flowing through the first flow path 42 of the cooling unit 45 and the water W2 flowing through the second flow path 45a flow in the same direction.

[0075] In the chemical heat storage system 11 of each of the above embodiments, the water W1 heated by the evaporator 51 is supplied to the first heat exchanger 22 of the heat accumulator 21, but water vapor generated by the evaporator 51 may be supplied to the first heat exchanger 22 of the heat accumulator 21. Even in this case, for example, the actions and effects described in section (1-5) of the first embodiment can be obtained.

[0076] In the chemical heat storage system 11 of the above embodiment, the water W1 heated in the evaporator 51 is supplied to the first heat exchanger 22 of the heat accumulator 21, but it is also possible to change so that the heating medium of the exhaust heat source HS is supplied to the first heat exchanger 22 of the heat accumulator 21.

[0077] The heat storage operation of the chemical heat storage system 11 of the above embodiment can also be performed using the condenser 41 and the recovery device 31. That is, in the 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 that is 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.

[0078] The condenser 41 of each of the above embodiments can also be used in a chemical heat storage system other than the chemical heat storage system 11. Furthermore, the condenser 41 of each of the above embodiments can also be used for purposes other than chemical heat storage systems. [Explanation of symbols]

[0079] 11...Chemical heat storage system 21... Heat storage device 22...First heat exchanger 31...Collector 32…Second heat exchanger 41...Condenser 42...First flow path 44...Condenser section 45…Cooling section 45a...Second flow path 46...Storage section 46a…Bottom wall part 46b...peripheral wall part 51...Evaporator 52...Fourth heat exchanger 81…Third heat exchanger CM…Cooling medium HM…Chemical heat storage material HS…Exhaust heat source LM...Absorbent material L4: Collector cooling channel L7: Receiver heating channel T1a...first inflow section T1b…1st outflow part W1, W2...Water WV1, WV2...water vapor

Claims

1. a condensation section for condensing water vapor; a cooling section located below the condensation section and configured to cool water; A condenser comprising: an accommodation portion that accommodates water cooled by the cooling portion, the condenser and the cooling unit each have a first flow path through which a cooling medium flows, the cooling section has a second flow path through which water flows, the second flow path is disposed adjacent to the first flow path, The condenser, wherein the accommodation portion has a bottom wall portion and a peripheral wall portion, and the peripheral wall portion is provided with the cooling portion.

2. The condenser according to claim 1 , wherein the condenser section includes a heat exchanger connected to the first flow path.

3. 3 . The condenser according to claim 1 , wherein the first flow path and the second flow path of the cooling portion are arranged to run parallel to each other and to spiral around the peripheral wall portion. 4 .

4. 4. The condenser according to claim 1, wherein the cooling medium flowing through the first flow path of the cooling unit and the water flowing through the second flow path flow in opposite directions.

5. The condenser according to claim 1 , wherein the first flow path of the cooling section is disposed on the peripheral wall of the accommodation section so as to be located more inward than the second flow path.

6. 6. The condenser according to claim 1, wherein an inlet portion through which the cooling medium flows into the first flow path is connected to the condenser portion, and an outlet portion through which the cooling medium flows out of the first flow path is connected to the cooling portion.

7. A heat accumulator having a chemical heat storage material that undergoes a dehydration reaction during heat storage operation and a hydration reaction during heat release operation and a heat exchanger that exchanges heat with the chemical heat storage material; A recovery device having an absorbent material that absorbs water vapor and recovers water vapor generated from the chemical heat storage material; a condenser that condenses the water vapor generated from the absorbent; An evaporator that supplies water vapor to the heat storage device to react with the chemical heat storage material, The recovery device has a heat exchanger that exchanges heat with the absorbent material, the evaporator has a heat exchanger to which a heating medium is supplied from an exhaust heat source, a collector cooling flow path that sends water cooled by the condenser to the heat exchanger of the collector; a recovery vessel heating flow path that sends water heated in the evaporator or steam generated in the evaporator to the heat exchanger of the recovery vessel, The collector cooling flow path and the collector heating flow path are configured to be switchable, The condenser is a condensation section for condensing water vapor; a cooling section located below the condensation section and configured to cool water; a storage unit that stores the water cooled by the cooling unit, the condenser and the cooling unit each have a first flow path through which a cooling medium flows, the cooling section has a second flow path through which water flows, the second flow path is disposed adjacent to the first flow path, The storage unit has a bottom wall and a peripheral wall, and the peripheral wall is provided with the cooling unit.

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