JP5397327B2 - Chemical heat storage device - Google Patents

Description

  The present invention relates to a chemical heat storage device that extracts heat using reaction heat of a substance and stores it by thermal decomposition.

  Conventionally, the thing of patent document 1 is known as a chemical heat generating apparatus used as a heat source for rapid heatings, such as a vehicle. In the prior art of Patent Document 1, a reactor filled with an alkaline earth metal oxide, a water tank, a water supply pipe for supplying water from the water tank to the reactor, and a reflux pipe for returning water from the reactor to the water tank are sealed. A cycle is formed, and a reversible reaction between an alkaline earth metal oxide and water is performed in a closed system. According to this, the heat of about 200-500 degreeC can be output.

JP-A-7-180539

  However, in the prior art of Patent Document 1 above, the composition ratio of the alkaline earth metal oxide and water in the closed cycle is an excess water composition, so the heat capacity in the reactor is increased due to the presence of unreacted water. growing. Thereby, there exists a problem that the temperature rise in a reactor is inhibited and the high temperature heat of 500 degreeC or more cannot be output.

  Moreover, in the prior art of the above-mentioned Patent Document 1, since alkaline earth metal oxide and water reach 400 ° C. or higher by reaction in a closed cycle, the water in the cycle becomes a supercritical fluid, and the inside of the apparatus is very There is a problem of high pressure.

  An object of this invention is to provide the chemical thermal storage apparatus which can output a high temperature heat | fever, suppressing the raise of the pressure in an apparatus in view of the said point.

  In order to achieve the above object, in the invention described in claim 1, the object to be heated (7) is produced by the reaction heat generated when the first reactant (A) and the second reactant (B) are reacted to produce a compound. In the chemical heat storage device that stores the heat by separating the compound into the first reactant (A) and the second reactant (B) by external heat that is heat generated outside the system, While having a heat exchanger for regeneration (11a, 12a) for heating, the first and second reactors (11, 12) for accommodating the first reactant (A) and the second reactant (B) are accommodated. The storage container (2), the condensing means (6) for condensing the second reactant (B) in the gaseous state, and the second reactant (B) accommodated in the storage container (2) in the liquid state are subjected to the first reaction. The first passage (41) leading to the reactor (11) and the gas state first produced in the first reactor (11) A second passage (42) for introducing the reactant (B) to the second reactor (12) and a second reactant (B) in a gaseous state generated when the compound is separated in the second reactor (12). A third passage (43) that leads to the condensing means (6), and a fourth passage (42) that guides the liquid second reactant (B) condensed by the condensing means (6) to the storage container (2). The second reactor (12) is characterized in that it is thermally connected to the heating object (7).

  According to this, the second reactant (B) in the liquid state is supplied from the storage container (2) to the first reactor (11) via the first passage (41). The supplied second reactant (B) in the liquid state reacts with the first reactant (A) in the first reactor (11) to form a compound, and heat of reaction is generated at that time.

  At this time, the unreacted liquid second reactant (B) present in the first reactor (11) is heated by the reaction heat and evaporated. The evaporated second reactant (B) is supplied to the second reactor (12) through the second passage (42). The supplied second reactant (B) in the gaseous state reacts with the first reactant (A) in the second reactor (12) to form a compound, and heat of reaction is generated at that time. At this time, since the second reactor (12) and the heating object (7) are thermally connected, the heating object (7) is heated by the reaction heat generated in the second reactor (12). can do.

  In this way, the second reactant (B) in the gaseous state at a high temperature and high pressure heated by the reaction heat generated in the first reactor (11) is supplied to the second reactor (12), and the second reactor is supplied. By reacting again with the first reactant (A) in (12), it is possible to output high-temperature heat as compared to a conventional chemical heat storage device having only one reactor. At this time, since the pressure in the chemical heat storage device becomes an equilibrium pressure at the reaction temperature of the first reactant (A) in the second reactor (12), an increase in the internal pressure of the device can be suppressed. Therefore, it is possible to output high-temperature heat while suppressing an increase in pressure in the apparatus.

  Further, as in the invention according to claim 2, in the chemical heat storage device according to claim 1, the first passage opening and closing means (51) for opening and closing the first passage (41) and the third passage (43) are provided. A third passage opening / closing means (53) for opening and closing may be provided.

  According to a third aspect of the present invention, in the chemical heat storage device according to the first or second aspect, which is applied to a vehicle having an internal heat engine, the object to be heated is an exhaust gas having a catalyst for purifying the exhaust gas of the internal combustion engine. The purification device (7), the external heat is the heat of the exhaust gas of the internal combustion engine, and the exhaust gas from the internal combustion engine flows through the first and second reactors (11, 12) and the exhaust gas purification device (7). The second reactor (12) is accommodated in the exhaust pipe (8), and is arranged on the upstream side of the exhaust gas flow with respect to the exhaust gas purification device (7).

  Thus, by disposing the second reactor (12) on the upstream side of the exhaust flow of the exhaust purification device (7), the reaction heat generated in the second reactor (12) is exhausted via the exhaust. (7) can be transmitted. That is, the reaction heat generated in the second reactor (12) is transferred to the exhaust purification device (7) with a simple configuration without providing a circuit for transferring the reaction heat to the exhaust purification device (7). Can be heated.

  In addition, by arranging the first and second reactors (11, 12) in the exhaust pipe (8), the heat of the exhaust can be used as a heat source for regeneration. That is, without providing a circuit for transferring external heat into the first and second reactors (11, 12), the first and second reactors (11, 11, The compound in 12) can be regenerated to the first reactant (A).

  According to a fourth aspect of the present invention, in the chemical heat storage device according to any one of the first to third aspects, the first and second reactors (11, 12) are for regeneration for heating a compound. The heating source (9) is accommodated.

  According to this, the compounds in the first and second reactors (11, 12) are heated by the regeneration heating source (9) and separated into the first reactant (A) and the second reactant (B). Can be made. For this reason, it is particularly effective when the compounds in the first and second reactors (11, 12) cannot be separated into the first reactant (A) and the second reactant (B) only by external heat. .

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a conceptual diagram which shows the chemical heat storage apparatus which concerns on 1st Embodiment. It is a whole block diagram which shows the chemical heat storage apparatus which concerns on 1st Embodiment. It is a graph which shows the equilibrium line of the water absorption reaction of the calcium oxide at the time of the thermal radiation mode in 1st Embodiment, and the vapor-liquid equilibrium line of water. It is a whole block diagram which shows the chemical heat storage apparatus which concerns on 2nd Embodiment. It is a whole block diagram which shows the chemical heat storage apparatus which concerns on 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a conceptual diagram showing a chemical heat storage device according to the first embodiment.

  The chemical heat storage device of the present embodiment includes a heat release mode in which the object to be heated is heated by reaction heat generated when the first reactant A and the second reactant B are reacted to generate a compound, and the compound is converted into the first reactant. By separating A and the second reactant B, the heat storage mode for storing external heat, which is heat generated outside the reaction system, can be switched.

  The chemical heat storage device includes first and second reactors 11 and 12 that contain a first reactant A in a solid state, and a storage container 2 that contains a second reactant B in a liquid state. The first and second reactors 11 and 12 accommodate regeneration heat exchange units 11a and 12a for heating the insides of the first and second reactors 11 and 12 with external heat, respectively.

  The chemical heat storage device of the present embodiment includes a first heat medium circuit 31 that circulates the first heat medium between the external heat source 3 and the heat exchangers 11a and 12a for regeneration. For this reason, in the heat storage mode, the first heat medium heated by the external heat source 3 is supplied to the heat exchangers 11a and 12a for regeneration, and the first and second reactors 11 and 12 are inside by the first heat medium. It is supposed to be heated.

  In addition, the chemical heat storage device communicates the first passage 41, the first reactor 11, and the second reactor 12 that guide the second reactant B accommodated in the storage container 2 to the first reactor 11 in a liquid state. A second passage 42 is provided.

  The first passage 41 is provided with a first passage opening / closing valve 51 for opening and closing the first passage 41 and a pump 52 for supplying the second reactant B in a liquid state to the first reactor 11. The first passage opening / closing valve 51 is configured to adjust the passage area of the first passage 41. In the present embodiment, the first passage opening / closing valve 51 is disposed on the downstream side of the pump 52.

  Moreover, the one end part of the 1st channel | path 41 is connected to the surface (in this embodiment vertical direction lower surface) which is contacting the 2nd reactant B in the storage container 2. FIG. Thereby, the 2nd reactant B can be supplied to the 1st reactor 11 in a liquid state.

  The second passage 42 guides the second reactant B in the gaseous state generated when the first reactant A and the second reactant B in the liquid state are reacted in the first reactor 11 to the second reactor 12. It is configured. More specifically, since the reaction in which the first reactant A and the second reactant B in the liquid state are reacted in the first reactor 11 to generate a compound is an exothermic reaction, the second heat in the liquid state is generated by the reaction heat. Reactant B is heated to evaporate. The second reactant B in the gaseous state is supplied into the second reactor 12 through the second passage 42.

  The chemical heat storage device includes a condenser 6 as a condensing unit that condenses the second reactant B in a gaseous state generated when the compounds are separated. The condenser 6 is a heat exchanger that performs heat exchange between the second reactant B in a gaseous state and the outside air to condense the second reactant B.

  In addition, the chemical heat storage device includes a third passage 43 that guides the second reactant B in a gaseous state generated when the compound is separated in the second reactor 12 to the condenser 6, and a liquid state condensed in the condenser 6. And a fourth passage 44 for guiding the second reactant B to the storage container 2. A third passage opening / closing valve 53 that opens and closes the third passage 43 is provided in the third passage 43. The third passage opening / closing valve 53 is configured to adjust the passage area of the third passage 43.

  The second reactor 12 is thermally connected to the heating object 7. Specifically, the chemical heat storage device circulates the second heat medium between the heat recovery heat exchange unit 12b disposed in the second reactor 12, the heat recovery heat exchange unit 12b, and the heating object 7. And a heat output circuit 71. The heat recovery heat exchanger 12b is a heat exchanger that heats the second heat medium with the reaction heat stopped by the reaction of the first reactant A and the second reactant B in the second reactor 12. For this reason, the reaction heat generated in the second reactor 12 is transferred to the heating object 7 through the second heat medium.

  Next, the operation of the present embodiment in the above configuration will be described with reference to FIG. First, the operation in the heat dissipation mode will be described.

  In the heat dissipation mode, the first passage opening / closing valve 51 is fully opened, the third passage opening / closing valve 53 is fully closed, and the pump 52 is activated. For this reason, the second reactant B in the liquid state accommodated in the storage container 2 flows into the first reactor 11 in the liquid state. And in the 1st reactor 11, the 1st reactant A accommodated in the 1st reactor 11 and the 2nd reactant B in the liquid state which flowed in from the storage container 2 react, and a compound is generated. In addition, reaction heat is generated.

  For this reason, in the 1st reactor 11, the 2nd reactant B in the unreacted liquid state is heated and evaporated by reaction heat. Then, the second reactant B in the gaseous state flows into the second reactor 12 through the second passage 42.

  In the second reactor 12, the first reactant A accommodated in the second reactor 12 reacts with the second reactant B in the gaseous state flowing in from the first reactor 11 to produce a compound. In addition, reaction heat is generated. The reaction heat generated during this reaction is transferred to the heating object 7 through the second heat medium.

  Next, the operation in the heat storage mode will be described. This heat storage mode is performed after the heat dissipation mode.

  In the heat storage mode, the third passage opening / closing valve 53 is fully opened, the first passage opening / closing valve 51 is fully closed, and the pump 52 is stopped. For this reason, the compounds in the first and second reactors 11 and 12 are heated by the external heat generated by the external heat source 3 and separated into the first reactant A and the second reactant B. As a result, the compounds in the first and second reactors 11 and 12 are regenerated into the first reactant A. Thereby, external heat can be stored.

  On the other hand, the gaseous second reactant B generated in the first and second reactors 11 and 12 flows into the condenser 6 through the third passage 43. The gaseous second reactant B flowing into the condenser 6 is cooled and condensed by the outside air, flows into the storage container 2 through the fourth passage 44, and is stored in the storage container 2.

  Subsequently, the above-described chemical heat storage device stores the heat of the exhaust from the exhaust system of the internal combustion engine (engine) of the vehicle, and uses that heat for warming up (heating) the exhaust gas purifying catalyst. An example applied to a heat storage device will be described.

  FIG. 2 is an overall configuration diagram showing the chemical heat storage device according to the first embodiment. As shown in FIG. 2, the first and second reactors 11 and 12 are arranged inside an exhaust pipe 8 through which exhaust gas from an internal combustion engine (not shown) flows. The first and second reactors 11 and 12 respectively have a plurality of exhaust passages 11c and 12c through which exhaust flows, and the first reactant A in a solid state is between the plurality of exhaust passages 11c and 12c. It is configured to be accommodated.

  Here, in this embodiment, calcium oxide (CaO) is used as the first reactant A, water is used as the second reactant B, and the compound is calcium hydroxide. The object to be heated is an exhaust purification device 7 including a catalyst for purifying exhaust, and the external heat is the heat of the exhaust.

  The exhaust gas purification device 7 is disposed inside the exhaust pipe 8 on the downstream side of the exhaust flow of the first and second reactors 11 and 12. In the present embodiment, the first reactor 11, the second reactor 12, and the exhaust purification device 7 are arranged in series in this order from the exhaust flow upstream side.

  Next, the operation of the present embodiment in the above configuration will be described with reference to FIG. First, the operation in the heat dissipation mode will be described.

  In the heat dissipation mode, the first passage opening / closing valve 51 is fully opened, the third passage opening / closing valve 53 is fully closed, and the pump 52 is activated. For this reason, the water accommodated in the storage container 2 flows into the 1st reactor 11 with a liquid state. And in the 1st reactor 11, while the calcium oxide accommodated in the 1st reactor 11 and the water of the liquid state which flowed in from the storage container 2 react, calcium hydroxide is produced | generated, and reaction heat Occurs.

  For this reason, in the 1st reactor 11, unreacted water is heated by reaction heat, evaporates, and turns into water vapor | steam. Then, the water vapor flows into the second reactor 12 through the second passage 42.

  In the 2nd reactor 12, the calcium oxide accommodated in the 2nd reactor 12 and the water vapor | steam which flowed in from the 1st reactor 11 react, a calcium hydroxide is produced | generated and reaction heat arises. The reaction heat generated during this reaction is transferred to the heating object 7 through the exhaust.

  In the first and second reactors 11 and 12, the chemical formula of the reaction that occurs in the heat release mode is represented by the following chemical formula 1.

(Chemical formula 1)
CaO + H ₂ O → Ca (OH) ₂
Next, the operation in the heat storage mode will be described. This heat storage mode is performed after the temperature of the exhaust gas reaches the renewable temperature of calcium oxide.

  In the heat storage mode, the third passage opening / closing valve 53 is fully opened, the first passage opening / closing valve 51 is fully closed, and the pump 52 is stopped. For this reason, the calcium hydroxide in the 1st, 2nd reactors 11 and 12 is heated with the heat which exhaust_gas | exhaustion has, and it isolate | separates into calcium oxide and water (water vapor | steam). Thereby, the calcium hydroxide in the first and second reactors 11 and 12 is regenerated into calcium oxide. Thereby, the heat of the exhaust can be stored.

  In the first and second reactors 11 and 12, the chemical formula of the reaction that occurs in the heat storage mode is expressed by the following chemical formula 2.

(Chemical formula 2)
Ca (OH) ₂ → CaO + H ₂ O ↑
On the other hand, the steam generated in the first reactor 11 flows into the second reactor 12 through the second passage 42, and together with the steam generated in the second reactor 12, the condenser 6 through the third passage 43. Flow into. The water vapor flowing into the condenser 6 is cooled and condensed by the outside air, flows into the storage container 2 through the fourth passage 44, and is stored in the storage container 2.

  By disposing the second reactor 12 on the upstream side of the exhaust gas flow of the exhaust gas purification device 7, the heat of reaction generated in the second reactor 12 can be transmitted to the exhaust gas purification device 7 through the exhaust gas. That is, the reaction heat generated in the second reactor 12 can be transferred to the exhaust purification device 7 with a simple configuration without providing a heat output circuit. At this time, the surface in contact with the calcium oxide in the exhaust passage 12c of the second reactor 12 constitutes a heat exchanging heat exchanger.

  In addition, by arranging the first and second reactors 11 and 12 in the exhaust pipe 8, the heat of the exhaust can be used as a heat source for regeneration. That is, without providing the first heat medium circuit, the calcium hydroxide in the first and second reactors 11 and 12 can be regenerated to calcium oxide by the heat of the exhaust gas with a simple configuration. At this time, the surfaces in contact with calcium hydroxide in the exhaust passages 11c and 12c of the first and second reactors 11 and 12 constitute a heat exchange section for regeneration.

  FIG. 3 is a graph showing the equilibrium line of the water absorption reaction of calcium oxide and the vapor-liquid equilibrium line of water in the heat dissipation mode in the first embodiment. The horizontal axis in FIG. 3 represents the reciprocal of the temperature, and the vertical axis represents the gas pressure. Moreover, in FIG. 3, the continuous line represents the equilibrium line in the water absorption reaction of calcium oxide, and the broken line represents the vapor-liquid equilibrium line of water.

  As shown in FIG. 3, in the heat dissipation mode, when the initial temperature is 0 ° C., the temperature and pressure in the first and second reactors 11 and 12 are point A in the figure. Here, when water is supplied into the first reactor 11, the calcium oxide and water in the first reactor 11 are changed from point A to point B in the figure along with the reaction shown in the above chemical formula 1 (water absorption reaction). Both temperature and pressure increase. At this time, high-temperature (about 150 ° C.) high-pressure steam flows into the second reactor 12 through the second passage 42.

  The calcium oxide in the second reactor 12 then reacts with the high-temperature and high-pressure steam produced in the first reactor 11 (see point B in the figure) and further the reaction shown in Formula 1 above (water absorption reaction). The temperature rises to about 560 ° C. (see point C in the figure). The reaction heat in this reaction is used to heat the exhaust purification device 7. For this reason, in the chemical heat storage device of this embodiment, high-temperature heat of about 560 ° C. can be output.

  By the way, in the chemical heat storage device of the present embodiment, when calcium oxide and water are in an unreacted state, the amount of calcium oxide in the device is nA [mol], and the amount of water in the device and water is nB [mol]. , Calcium oxide and water are enclosed so that nB / nA is in the range of 1 to 1.2. That is, the molar ratio of water to calcium oxide is in the range of 1 to 1.2.

  Here, if there is more water than the amount of calcium oxide, the unreacted water increases the heat capacity. That is, since the temperature rise in the first reactor 11 is suppressed by the heat capacity of unreacted water, the temperature of the heat output by the second reactor 12 is also lowered. For this reason, it is desirable that the molar ratio of water to be reacted is ideally 1 with respect to calcium oxide. However, since it is difficult to transport all the water from the storage container 2 to the first reactor 11, the molar ratio of water to calcium oxide is in the range of 1 to 1.2, so that the output heat can be reduced. The chemical heat storage device can be operated efficiently while suppressing a decrease in temperature.

  According to the present embodiment, liquid water is supplied from the storage container 2 to the first reactor 11 through the first passage 41 in the heat dissipation mode. The supplied liquid water reacts with calcium oxide in the first reactor 11 to generate calcium hydroxide, and heat of reaction is generated at that time.

  At this time, unreacted water present in the first reactor 11 is heated by the reaction heat and evaporated. The vaporized water (water vapor) is supplied to the second reactor 12 via the second passage 42. The supplied water vapor reacts with calcium oxide in the second reactor 12 to generate calcium hydroxide, and heat of reaction is generated at that time. At this time, the exhaust gas purification device 7 is disposed on the downstream side of the exhaust flow of the second reactor 12, that is, the second reactor 12 and the exhaust gas purification device 7 are thermally connected. The reaction heat generated in 12 is transferred to the exhaust purification device 7 through the exhaust, and the exhaust purification device 7 can be heated.

  In this way, the high-temperature and high-pressure steam heated by the reaction heat generated in the first reactor 11 is supplied to the second reactor 12, and is reacted again with calcium oxide in the second reactor 12. Compared with the conventional chemical heat storage device provided with only one, high-temperature (500 ° C. or higher) heat can be output. At this time, since the pressure in the chemical heat storage device becomes the saturated vapor pressure at the temperature of the water in the first reactor 11, an increase in the internal pressure of the device can be suppressed. Therefore, it is possible to output high-temperature heat while suppressing an increase in pressure in the apparatus.

  By the way, in order to warm up the exhaust gas purification device 7 at an early stage, the chemical heat storage device as the warm-up means must be quickly heated. For this reason, it is important how to increase the hydration reaction rate of calcium oxide and water, but the reaction rate is governed by the vapor pressure of water. That is, in order to increase the hydration reaction rate, it is important to heat the water to be reacted in a short time.

  In the present embodiment, since the liquid water is directly supplied to the first reactor 11, the reaction heat of the hydration reaction can be immediately transferred to the water, thereby increasing the reaction rate. Can be obtained.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment in the arrangement of the first and second reactors 11 and 12 and the exhaust purification device 7.

  FIG. 4 is an overall configuration diagram showing a chemical heat storage device according to the second embodiment. As shown in FIG. 4, the second reactor 12, the exhaust purification device 7, and the first reactor 11 are arranged in this order from the upstream side of the exhaust flow inside the exhaust pipe 8.

  When the temperature of the exhaust gas flowing into the exhaust pipe 8 becomes higher than the temperature of the first reactor 11, the first reactor 11 cools the exhaust gas. In a system in which such an operating condition occurs, the first reactor 11 is disposed on the downstream side of the exhaust gas flow with respect to the exhaust gas purification device 7 as in the second embodiment. Can be prevented from interfering with the warming up of the exhaust emission control device 7.

  Moreover, even when there is no space for arranging two reactors 11 and 12 on the upstream side of the exhaust gas flow of the exhaust gas purification device 7, it is effective to apply the chemical heat storage device of the second embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment is different from the second embodiment in that a regeneration heat source is disposed in the first and second reactors 11 and 12.

  FIG. 5 is an overall configuration diagram showing a chemical heat storage device according to the third embodiment. As shown in FIG. 5, an electric heater 9 as a regeneration heat source for heating calcium hydroxide is disposed inside the first and second reactors 11 and 12.

  In order to warm up the exhaust purification device 7 early, it is necessary that the calcium oxide in the first and second reactors 11 and 12 is regenerated. However, when calcium oxide is regenerated using the heat of the exhaust as in the first and second embodiments, there is a possibility that the regeneration time and the temperature required for regeneration cannot be sufficiently ensured depending on the use situation. If the regeneration of calcium oxide is insufficient in such a situation, in the next operation, the exhaust purification device 7 cannot be warmed up early, but the hydration reaction cannot be performed. The containers 11 and 12 themselves increase the heat capacity, and rather delay the warm-up.

  On the other hand, as in this embodiment, by providing the electric heater 9 as a regeneration heat source for heating calcium hydroxide inside the first and second reactors 11 and 12, even in the above-described situation, it can be ensured. In addition, calcium oxide can be regenerated, and it is possible to cope with various operating conditions.

  This is particularly effective when the chemical heat storage device is applied to a plug-in hybrid vehicle that can charge a secondary battery using a power source outside the vehicle. That is, since the plug-in hybrid vehicle has low heat of the exhaust, it is difficult to sufficiently regenerate the calcium oxide in the first and second reactors 11 and 12 only with the heat of the exhaust. However, since the calcium hydroxide can be heated by the heat of the electric heater 9 by energizing the electric heater 9 when charging the secondary battery, the calcium oxide can be reliably regenerated.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows without departing from the spirit of the present invention.

  (1) In each of the above embodiments, an example in which the heat of exhaust gas is used as external heat and the exhaust gas purification device 7 is used as an object to be heated has been described, but is not limited thereto, for example, solar heat, factory exhaust heat, or electric heater And a heating unit of a fuel cell or a thermoelectric conversion device may be used as a heating object.

  (2) In each of the above embodiments, an example in which calcium oxide is used as the first reactant A has been described. However, the present invention is not limited thereto, and an alkaline earth metal oxide such as magnesium oxide may be used.

  (3) Each embodiment mentioned above may be combined suitably in the possible range.

2 Storage container 6 Condenser (condensing means)
7 Exhaust gas purification device (object to be heated)
8 Exhaust pipe 9 Electric heater (regeneration heating source)
11 1st reactor 12 2nd reactor 41 1st channel | path 42 2nd channel | path 43 3rd channel | path 44 4th channel | path

Claims (4)

External heat which is heat generated outside the system by heating the object to be heated (7) by reaction heat generated when the first reactant (A) and the second reactant (B) are reacted to produce a compound. A chemical heat storage device for storing heat by separating the compound into the first reactant (A) and the second reactant (B) by:
A first and second reactor (11, 12) having a regeneration heat exchange section (11a, 12a) for heating the compound by the external heat and containing the first reactant (A);
A storage container (2) containing the second reactant (B);
Condensing means (6) for condensing the second reactant (B) in a gaseous state;
A first passage (41) for guiding the second reactant (B) contained in the storage container (2) to the first reactor (11) in a liquid state;
A second passage (42) for guiding the second reactant (B) in a gaseous state generated in the first reactor (11) to the second reactor (12);
A third passage (43) for guiding the second reactant (B) in a gaseous state generated when the compound is separated in the second reactor (12) to the condensing means (6);
A fourth passage (42) for guiding the second reactant (B) in a liquid state condensed by the condensing means (6) to the storage container (2),
The chemical heat storage device, wherein the second reactor (12) is thermally connected to the heating object (7). A first passage opening / closing means (51) for opening and closing the first passage (41);
The chemical heat storage device according to claim 1, further comprising third passage opening / closing means (53) for opening and closing the third passage (43). The chemical heat storage device according to claim 1 or 2, applied to a vehicle including an internal heat engine,
The heating object is an exhaust purification device (7) including a catalyst for purifying exhaust of the internal combustion engine,
The external heat is heat that the exhaust of the internal combustion engine has,
The first and second reactors (11, 12) and the exhaust purification device (7) are accommodated in an exhaust pipe (8) through which exhaust gas from the internal combustion engine flows,
The chemical heat storage device, wherein the second reactor (12) is disposed on the upstream side of the exhaust gas flow with respect to the exhaust gas purification device (7).   4. The heating source for regeneration (9) for heating the compound is accommodated in the first and second reactors (11, 12), according to claim 1. Chemical heat storage device.

Images