DE102014216597A1 - A heat storage device and method of operating a heat storage device - Google Patents

Abstract

In order to provide a heat storage device which is simple and efficient to operate, it is proposed that the heat storage device comprises: a primary storage device, which comprises a storage medium and which can be flowed through by a heat transfer medium, so that in a loading process, heat from the heat transfer medium to the storage medium and heat can be transferred from the storage medium to the heat transfer medium during a discharge process; a receiving device for receiving condensate forming during the loading process of the heat transfer medium; a secondary storage device of the heat storage device, which is formed as a thermochemical storage device; a fluid guide for supplying the condensate of the heat transfer medium to the secondary storage device of the heat storage device.

Description

The present invention relates to a heat storage device, in particular a so-called contact heat storage for storing high-temperature heat.

For example, in the storage of high temperature heat, a heated air stream may be fed to a solid to transfer heat from the air stream to the solid. In this case, water contained in the air stream can condense, which can result in a reduced efficiency of the heat storage device.

The present invention has for its object to provide a heat storage device which is simple and efficient operable.

This object is achieved according to the invention by a heat storage device which comprises:
a primary storage device, which comprises a storage medium and which can be flowed through by a heat transfer medium, so that heat can be transferred from the heat transfer medium to the storage medium during a loading process and heat can be transferred from the storage medium to the heat transfer medium during a discharge process;
a receiving device for receiving condensate forming during the loading process of the heat transfer medium;
a secondary storage device of the heat storage device, which is formed as a thermochemical storage device;
a fluid guide for supplying the condensate of the heat transfer medium to the secondary storage device of the heat storage device.

Because the heat storage device according to the invention comprises a receiving device for receiving condensate and a secondary storage device, the condensate accumulating during operation of the heat storage device can preferably be used to increase the efficiency of the heat storage device.

It may be advantageous if in the primary storage device heat from the heat transfer medium to the storage medium and / or from the storage medium to the heat transfer medium by direct material contact of the heat transfer medium with the storage medium is transferable.

Such a heat storage device is in particular a direct contact heat storage.

It may be favorable if by means of the receiving device condensate of the heat transfer medium can be received, which forms in particular during the loading process in the primary storage device and / or in a separate drying device for drying the heat transfer medium.

The drying device is, for example, a predrying device for predrying the heat transfer medium before it is fed to the primary storage device for charging it with heat.

It can be provided that the heat storage device comprises a heat exchanger, by means of which heat from the condensate of the heat transfer medium to a thermochemical storage material of the secondary storage device is transferable.

In particular, it can be provided that the heat by means of the heat exchanger without material contact between the thermochemical storage material and the condensate of the heat transfer medium of the condensate of the heat transfer medium to the thermochemical storage material is transferable.

In one embodiment of the invention can be provided that the receiving device comprises a Ruths memory which is fluidly connected to the heat exchanger of the heat storage device, in particular such that passed through the heat exchanger condensate of the heat transfer medium can be supplied to the Ruths memory.

It may be advantageous if the condensate of the heat transfer medium after the transfer of a portion of the sensible heat contained therein to the thermochemical storage material of the secondary storage device is the Ruths memory supplied.

It can be provided that the Ruths memory of the recording device is fluidly connected to a storage space of the secondary storage device.

In particular, it may be provided that the Ruths memory of the receiving device is connected in such a fluid-effective manner to a storage space of the secondary storage device that heat transfer medium from the Ruths store can be fed to the thermochemical storage material of the secondary storage device.

The Ruths storage supplied heat transfer medium is in particular condensate of the heat transfer medium.

From the Ruths storage discharged heat transfer medium is in particular vaporous heat transfer medium.

It may be advantageous if the receiving device comprises a compressor device, by means of which from the secondary storage device, in particular from a storage space of the secondary storage device, discharged heat transfer medium is compressible. The discharged and compressed heat transfer medium is then in particular the Ruths memory supplied.

It can be favorable if the heat storage device comprises a discharge device, by means of which in particular through the storage space of the secondary storage device passed heat transfer medium can be discharged.

Furthermore, by means of the discharge device preferably through the storage space of the secondary storage device led heat transfer medium can be supplied to a heated by means of the primary storage device heat transfer medium.

The heat transfer medium to be supplied to the heat transfer medium flow can be fed to the heat transfer medium flow in particular by means of one or more jet pump devices.

The heat transfer medium is preferably a gaseous or vaporous medium.

The heat transfer medium may for example be air or comprise air.

The condensate of the heat transfer medium is preferably a condensate of a component of the heat transfer medium. For example, the condensate of the heat transfer medium is water.

In particular, from the Ruths storage removed or discharged heat transfer medium is then preferably water vapor.

The thermochemical storage material is preferably a hydrate-forming material.

The present invention further relates to a method of operating a heat storage device.

The invention is in this respect the task of providing a method by which a heat storage device is easy and efficient operable.

This object is achieved according to the invention by a method for operating a heat storage device, in particular a heat storage device according to the invention, the method comprising:
Flowing through a storage medium of a primary storage device with a heated heat transfer medium, wherein heat is transferred from the heat transfer medium to the storage medium;
Receiving condensate of the heat transfer medium, which forms in particular when supplying heat to the storage medium, by means of a receiving device of the heat storage device;
Supplying the condensate of the heat transfer medium to a formed as a thermochemical storage device secondary storage device of the heat storage device.

The method according to the invention preferably has one or more of the features and / or advantages described in connection with the heat storage device according to the invention.

It may be advantageous if the condensate of the heat transfer medium is supplied to a heat exchanger. By means of the heat exchanger, heat from the condensate is preferably transferred indirectly to a thermochemical storage material of the secondary storage device.

Under an indirect transfer of heat is in particular a transfer to understand, which takes place without material contact between the heat-emitting and the heat-absorbing material.

It may be favorable if the thermochemical storage material of the secondary storage device reacts chemically and / or physically during the absorption of heat and thereby emits heat transfer medium, in particular gaseous heat transfer medium.

The heat transfer medium discharged from the thermochemical storage material is preferably compressed by means of a compressor device and in particular supplied to a Ruths memory of the receiving device.

It may be advantageous if the condensate of the heat transfer medium, in particular after the indirect heat transfer to the thermochemical storage material of the secondary storage device, a Ruths memory of the receiving device is supplied.

The condensate of the heat transfer medium is preferably removed in vapor form from the Ruths store and introduced as heat transfer medium vapor into a storage space of the secondary storage device.

It may be favorable if at least part of the heat transfer medium reacts exothermically with a thermochemical storage material of the secondary storage device arranged in the storage space of the secondary storage device, in particular reacting exothermically chemically.

Furthermore, it can be provided that a part of the heat transfer medium is passed through the storage space. Due to the exothermic reaction of the part of the heat transfer medium is preferably heated. About a discharge device, the part of the heat transfer medium is preferably removed, in particular supplied to a heated by means of the primary storage device heat transfer medium flow.

Furthermore, the heat storage device according to the invention and / or the method according to the invention for operating a heat storage device can have one or more of the features and / or advantages described below:
The heat storage device is preferably a direct contact heat storage device.

In particular, it can be provided that the heat storage device is a regenerator, which is operable in direct contact operation.

The heat storage device according to the invention is particularly suitable for use in combined cycle power plants, CHP plants, solar tower power plants with air receivers and / or adiabatic compressed air storage power plants (A-CAES).

The resulting condensate in processes with heat storage condensate can be used as a reaction partner within a separate thermochemical heat storage. In this case, preferably not only the sensible heat of the condensate is used, but also low-temperature heat from the regenerator storage could be "pumped" through the thermochemical storage to a higher temperature level. This can preferably contribute to improving the overall efficiency of the system.

In thermochemical energy storage, the heat of reaction of a chemical reaction is stored in the form of chemical energy. Thus, for example, a compound of type AB can be converted into components A and B with heat absorption (positive reaction enthalpy Δ _R H), with the amount of heat Δ _R H being converted (stored) into the chemical energy of system A + B.

If, in the case of a reversible reaction, the reversion of the products A + B to the starting compound AB is prevented by the separation of the substances A or B, the energy stored in chemical form can be stored loss-free for any length of time. When A and B are brought together, the reaction proceeds in the opposite direction, whereby the then released reaction heat ΔH _R must be dissipated and used elsewhere. AB + Δ _R H → A + B

The reaction system proposed here is a heterogeneous gas-solid reaction. The reason is the easy separation of products A and B due to different states of aggregation. The molecules of these reactions are small, but the reaction enthalpies large, so that potentially high storage densities can be achieved. The thermal loading of the memory is heard, for example, by a dehydration (endothermic reaction), the discharge, for example by a hydration (exothermic reaction): AB + Δ _R H ← A + B

The following table lists examples of the dehydration of metal hydroxides and salt hydrates, each with associated temperature ranges at ambient pressure in which the reactions take place. Depending on which temperature is present at the "cold" end of the regenerator storage or at which temperature and at which pressure the condensate accumulates, different reaction systems can be advantageous. reaction type reaction Temperature range in ° C Thermal dehydrogenation of metal hydrides MgH ₂ ↔ Mg + H ₂ Mg ₂ NiH ₄ ↔ Mg ₂ Ni + 2H ₂ 200-400 150-300 Thermal deoxygenation of metal oxides BaO ₂ ↔ BaO + ½O ₂ 2KO ₂ ↔ K ₂ O + 3 / 2O ₂ 750-850 600-800 Dehydration of metal hydroxides Mg (OH) ₂ ↔ MgO + H ₂ O Ca (OH) ₂ ↔ CaO + H ₂ O Ba (OH) ₂ ↔ BaO + H ₂ O 250-350 450-550 700-800 Dehydration of salt hydrates MgSO ₄ .7H ₂ O ↔ MgSO ₄ + 7H ₂ O CuSO ₄ .5H ₂ O ↔ CuSO ₄ + 5H ₂ O CaCl ₂ .2H ₂ O ↔ CaCl _2. 1H ₂ O + 1H ₂ O 100-150 180-250 150-200 Decarboxylation of metal carbonates ZnCO ₃ ↔ ZnO + CO ₂ MgCO ₃ ↔ MgO + CO ₂ CaCO ₃ ↔ CaO + CO ₂ 100-150 350-450 850-950

It may be favorable if the heat storage device is a regenerator storage, in which a condensate removal is integrated. Depending on different process parameters such as pressure and temperature, different positioning in the system diagram may prove advantageous.

For example, when using the heat storage device in an adiabatic compressed air storage power plant, it may be provided that the heat storage device (in particular the Regeneratorwärmespeicher) between compressor and turbine on the one hand and cavern on the other hand is arranged. The pressure is for example between about 60 bar and about 70 bar. For example, condensate (water) drops between about 120 ° C and about 150 ° C. By means of the heat storage device according to the invention, preferably the sensible heat of the condensate can be used to increase the efficiency.

A Ruths memory is in particular a latent heat store, which uses the phase change liquid-vapor, wherein the heat transfer medium is steam. For energy supply steam is fed for example in a large container in a liquid receiver, which condenses and thereby increase the liquid temperature and the container pressure (saturation state). To remove steam, the steam space is opened, so that the tank pressure and the associated liquid temperature (saturation temperature) drop. Here, the saturated water is brought to a boil and thus used for steam generation.

In particular, when the secondary storage device comprises a formed as a hydrate forming material thermochemical storage material, preferably, an optimized use of the condensate of the heat transfer medium. In particular, when parallel to the thermal discharge of the regenerator (Endladevorgang the primary storage device) steam is removed from the Ruths memory by opening a valve and passed through the storage space of the secondary storage device, a hydration reaction can take place. The level of the equilibrium temperature of the hydration is preferably substantially higher than in the dehydration, since this takes place at a higher pressure. This can be explained in particular by the Van't Hoff equation: ln (p) = - ((Δ _R H) / RT) + K

Preferably, this results in a higher temperature when unloading the secondary storage device than when loading the same.

By means of the secondary storage device, a heat transformation can therefore be realized in particular.

Preferably, by the use of condensate from the primary storage device also according to the principle of Le Chatelier the targeted shift of the chemical equilibrium position towards hydrate formation can be used. The heat released in the reaction is preferably transported along by the exiting steam, which can preferably be supplied to the heated heat carrier medium flow from the primary storage device by means of a jet pump.

The heat storage device is particularly suitable for use as a high-temperature heat storage in power plant technology and / or as a hot blast.

Further preferred features and / or advantages of the invention are the subject of the following description and the drawings of an embodiment.

In the drawings show:

1 a schematic representation of a heat storage device comprising a primary storage device and a secondary storage device for increasing the efficiency of the primary storage device, wherein the heat storage device is in a loading state, in which the primary storage device, heat is supplied; and

2 one of the 1 corresponding schematic representation of the heat storage device, wherein the heat storage device is in a discharge state in which heat is removed from the primary storage device.

Identical or functionally equivalent elements are provided with the same reference numerals in all figures.

One in the 1 and 2 illustrated first embodiment of a whole as 100 designated thermal storage device finds, for example, in a compressed air storage power plant 102 Application.

By means of the heat storage device 100 In particular, heat can come from one in a main line 104 of the compressed air storage power plant 102 be cached guided heat transfer medium flow.

The heat storage device 100 comprises a primary storage device 106 , which is filled with a storage medium, such as a solid.

The primary storage device 106 is with the heat transfer medium, which subsequently as 108 is referred to, permeable to heat from the heat transfer medium 108 on the following with 110 to transfer designated storage medium or heat from the storage medium 110 on the heat transfer medium 108 transferred to.

The heat transfer medium 108 is for example air and contains gaseous water or water vapor.

In particular, when transferring heat from the heat transfer medium 108 on the storage medium 110 can thus form liquid water.

This water is especially condensate 112 the heat transfer medium 108 , The heat storage device 100 preferably comprises a receiving device 114 to absorb the condensate 112 the heat transfer medium 108 ,

In particular, by means of the receiving device 114 the condensate 112 the heat transfer medium 108 from the primary storage device 106 removable.

The heat storage device 100 further includes a fluid guide 116 , by means of which the from the primary storage device 106 removed condensate 112 a secondary storage device 118 the heat storage device 100 can be fed.

The secondary storage device 118 includes in particular a memory space 120 , which contains a thermochemical storage material 122 is filled.

In addition, the heat storage device includes 100 a heat exchanger 124 , by means of which the fluid guide 116 and that in the storage room 120 the secondary storage device 118 arranged thermochemical storage material 122 thermally connected to each other.

By means of the heat exchanger 124 can thus heat from that in the fluid guide 116 guided condensate 112 on that in the storage space 120 arranged thermochemical storage material 122 be transferred, in particular without material contact between the condensate 112 and the thermochemical storage material 122 ,

The heat storage device 100 , in particular the receiving device 114 , further comprises a Ruths memory 126 from which the primary storage device 106 removed condensate 112 the heat transfer medium 108 can be fed.

By means of a discharge device 128 can in the ruths store 126 contained condensate 112 from the Ruths store 126 be removed.

By means of a compressor device 130 the heat storage device 100 can one from the storage space 120 the secondary storage device 118 withdrawn gas or one from the storage space 120 the secondary storage device 118 extracted liquid to be compressed, in particular to the gas or the liquid the Ruths memory 126 supply.

A laxative device 132 the heat storage device 100 serves the discharge of through the storage space 120 the secondary storage device 118 passed heat transfer medium 108 ,

By means of a jet pump 134 the heat storage device 100 that's about the laxative 132 dissipated heat transfer medium 108 in particular back into the heat transfer medium flow in the main line 104 of the compressed air storage power plant 102 introduced.

The heat storage device 100 finally includes several valves 136 , by means of which in particular between a loading process (loading condition), which in 1 is shown, and a discharging (discharge), which in 2 is shown, the heat storage device 100 can be switched.

The heat storage device described above 100 works as follows:
When using the heat storage device 100 Heat from the heat transfer medium 108 of the compressed air storage power plant 102 is to be stored, then one in the main line 104 arranged valve 136 closed to that in the main line 104 guided heat transfer medium 108 into the primary storage device 106 the heat storage device 100 initiate.

In the primary storage device 106 comes the heat transfer medium 108 with the storage medium 110 in contact and transmits doing in the heat transfer medium 108 contained heat at least partially on the storage medium 110 ,

Due to the resulting cooling of the heat transfer medium 108 may be in the primary storage device 106 a condensate 112 the heat transfer medium 108 form.

This condensate 112 the heat transfer medium 108 is by means of the recording device 114 added.

In particular, the condensate 112 via the fluid guide 116 from the primary storage device 106 dissipated and first the heat exchanger 124 fed.

The still relatively hot condensate 112 gives some of its heat by means of the heat exchanger 124 without material contact with the thermochemical storage material 122 in the memory space 120 the secondary storage device 118 from.

After flowing through the heat exchanger 124 becomes the condensate 112 the heat transfer medium 108 the Ruths store 126 the cradle 114 fed.

This is due to the heat transfer from the condensate 112 the heat transfer medium 108 heated thermochemical storage material 122 , which is in particular a hydrate-forming storage material, gives off water while absorbing heat. In particular, the thermochemical storage material 122 thereby dehydrated.

In the storage room 120 the secondary storage device 118 thus gaseous or vaporous water collects, which preferably also via the fluid guide 116 the Ruths store 126 is supplied.

Since that is in storage space 120 the secondary storage device 118 collecting gaseous or vaporous water at a lower pressure than the pressure in Ruths storage 126 may be from the storage space 120 discharged gaseous or vaporous water preferably first by means of the compressor device 130 compressed it before the Ruths memory 126 is supplied.

In the heat storage device 100 is thus in the in 1 loading state shown in the primary storage device 106 accumulating condensate 112 for dehydration of the thermochemical storage material 122 the secondary storage device 118 and finally the Ruths store 126 fed.

By switching the valves 136 the heat storage device 100 can the heat storage device 100 in the in 2 shown Endladezustand be brought.

In this Endladezustand is heat transfer medium 108 through the primary storage device 106 led to heat from the storage medium 110 the primary storage device 106 on the heat transfer medium 108 to transfer and thus again a heated heat transfer medium flow for forwarding in the main line 104 to create.

The means of the recording device 114 during the loading process of the heat storage device 100 absorbed condensate 112 is here to increase the efficiency of the heat storage device 100 used.

In particular, the heat transfer medium 108 from the Ruths store 126 taken and into the storage room 120 the secondary storage device 118 initiated.

By removing the heat transfer medium 108 from the Ruths store 126 The pressure in the Ruths memory drops 126 , which also decreases the saturation temperature. By means of the Ruths memory 126 can thus in particular continuously vaporous heat transfer medium 108 , in particular steam, are provided.

The, in particular vaporous, heat transfer medium 108 comes in the storage room 120 the secondary storage device 118 with the thermochemical storage material 122 in contact.

By chemical reaction between the heat transfer medium 108 and the thermochemical storage material 122 Heat is preferably released. In particular, there is a hydration of the thermochemical storage material 122 instead of.

The amount of out of the Ruths store 126 the storage space 120 the secondary storage device 118 supplied heat transfer medium 108 is chosen so that only a part of the heat transfer medium 108 with the thermochemical storage material 122 reacts and is thus used for heat release. The other part of the heat transfer medium 108 which is the storage space 120 is supplied, is heated by means of the heat released and the discharge device 132 from the storage room 120 dissipated. This part of the heat transfer medium 108 is thus only by the memory space 120 the secondary storage device 118 passed.

By means of the jet pump 134 that's about the laxative 132 dissipated heat transfer medium 108 finally again in the main line 104 guided heat transfer medium flow of the compressed air storage device 102 fed.

By doing that from the Ruths store 126 extracted heat transfer medium 108 through the secondary storage device 118 can be passed through it and thereby heated, which also first as condensate 112 undesirable accumulating heat transfer medium 108 contribute to the provision of a heated heat transfer medium flow.

The heat storage device 100 This can have a high efficiency.

LIST OF REFERENCE NUMBERS

100

 Heat storage device

102

 Compressed air energy storage

104

 main

106

 Primary storage device

108

 Heat transfer medium

110

 storage medium

112

 condensate

114

 cradle

116

 fluid guide

118

 Secondary storage device

120

 storage space

122

 storage material

124

 Heat exchanger

126

 Ruths storage

128

 drain system

130

 compressor device

132

 discharge device

134

 jet pump

136

 Valve

Claims (18)

Heat storage device ( 100 ), comprising: - a primary storage device ( 106 ), which is a storage medium ( 110 ) and which with a heat transfer medium ( 108 ) is flowed through, so that in a loading process heat from the heat transfer medium ( 108 ) on the storage medium ( 110 ) and during a discharge heat from the storage medium ( 110 ) on the heat transfer medium ( 108 ) is transferable; A receiving device ( 114 ) for receiving condensate forming during the loading process ( 112 ) of the heat transfer medium ( 108 ); A secondary storage device ( 118 ) of the heat storage device ( 100 ), which is formed as a thermochemical storage device; A fluid guide ( 116 ) for supplying the condensate ( 112 ) of the heat transfer medium ( 108 ) to the secondary storage device ( 118 ) of the heat storage device ( 100 ). Heat storage device ( 100 ) according to claim 1, characterized in that in the primary storage device ( 106 ) Heat from the heat transfer medium ( 108 ) on the storage medium ( 110 ) and / or from the storage medium ( 110 ) on the heat transfer medium ( 108 ) by direct material contact of the heat transfer medium ( 108 ) with the storage medium ( 110 ) is transferable. Heat storage device ( 100 ) according to one of claims 1 or 2, characterized in that by means of the receiving device ( 114 ) Condensate ( 112 ) of the heat transfer medium ( 108 ), which is in the loading process in the primary storage device ( 106 ) and / or in a separate drying device for drying the heat transfer medium ( 108 ). Heat storage device ( 100 ) according to one of claims 1 to 3, characterized in that the heat storage device ( 100 ) a heat exchanger ( 124 ) by means of which heat from the condensate ( 112 ) of the heat transfer medium ( 108 ) to a thermochemical storage material ( 122 ) of the secondary storage device ( 118 ) is transferable. Heat storage device ( 100 ) according to one of claims 1 to 4, characterized in that the receiving device ( 114 ) a Ruths memory ( 126 ), which fluid-effectively with the heat exchanger ( 124 ) of the heat storage device ( 100 ), in particular such that through the heat exchanger ( 124 ) passed condensate ( 112 ) of the heat transfer medium ( 108 ) the Ruths store ( 126 ) can be fed. Heat storage device ( 100 ) according to claim 5, characterized in that the Ruths memory ( 126 ) of the receiving device ( 114 ) fluidly effective with a storage space ( 120 ) of the secondary storage device ( 118 ), in particular such that the heat transfer medium ( 108 ) from the Ruths store ( 126 ) the thermochemical storage material ( 122 ) of the secondary storage device ( 118 ) can be fed. Heat storage device ( 100 ) according to one of claims 1 to 6, characterized in that the receiving device ( 114 ) a compactor device ( 130 ), by means of which from the secondary storage device ( 118 ) dissipated heat transfer medium ( 108 ) and in particular the Ruths memory ( 126 ) can be fed. Heat storage device ( 100 ) according to one of claims 1 to 7, characterized in that the heat storage device ( 100 ) a discharge device ( 132 ), by means of which by the memory space ( 120 ) of the secondary storage device ( 118 ) guided heat transfer medium ( 108 ) and in particular one by means of the primary storage device ( 106 ) is fed to heated heat transfer medium flow. Heat storage device ( 100 ) according to one of claims 1 to 8, characterized in that the heat transfer medium ( 108 ) is a gaseous or vaporous medium, in particular air. Heat storage device ( 100 ) according to one of claims 1 to 9, characterized in that the thermochemical storage material ( 122 ) is a hydrate forming material. Method for operating a heat storage device ( 100 ), in particular a heat storage device ( 100 ) according to one of claims 1 to 10, the method comprising: - flowing through a storage medium ( 110 ) a primary storage device ( 106 ) with a heated heat transfer medium ( 108 ), wherein heat from the heat transfer medium ( 108 ) on the storage medium ( 110 ) is transmitted; - picking up condensate ( 112 ) of the heat transfer medium ( 108 ), which in particular when supplying heat to the storage medium ( 110 ), by means of a receiving device ( 114 ) of the heat storage device ( 100 ); - feeding the condensate ( 112 ) of the heat transfer medium ( 108 ) to a secondary storage device designed as a thermochemical storage device ( 118 ) of the heat storage device ( 100 ). Process according to claim 11, characterized in that the condensate ( 112 ) of the heat transfer medium ( 108 ) a heat exchanger ( 124 ) and that by means of the heat exchanger ( 124 ) Heat from the condensate ( 112 ) indirectly to a thermochemical storage material ( 122 ) of the secondary storage device ( 118 ) is transmitted. A method according to claim 12, characterized in that the thermochemical storage material ( 122 ) of the secondary storage device ( 118 ) reacts chemically and / or physically during the absorption of heat and thereby heat transfer medium ( 108 ), in particular gaseous heat transfer medium ( 108 ). A method according to claim 13, characterized in that the from the thermochemical storage material ( 122 ) discharged heat transfer medium ( 108 ) by means of a compressor device ( 130 ) and in particular a Ruths memory ( 126 ) of the receiving device ( 114 ) is supplied. Method according to one of claims 11 to 14, characterized in that the condensate ( 112 ) of the heat transfer medium ( 108 ), in particular after the indirect heat transfer to the thermochemical storage material ( 122 ) of the secondary storage device ( 118 ), a Ruths store ( 126 ) of the receiving device ( 114 ) is supplied. Process according to claim 15, characterized in that the condensate ( 112 ) of the heat transfer medium ( 108 ) in vapor form from the Ruths store ( 126 ) and removed as heat transfer medium vapor into a storage space ( 120 ) of the secondary storage device ( 118 ) is initiated. A method according to claim 16, characterized in that at least a part of the heat transfer medium ( 108 ) with one in memory space ( 120 ) of the secondary storage device ( 118 ) arranged thermochemical storage material ( 122 ) of the secondary storage device ( 118 ) reacts exothermically. A method according to claim 17, characterized in that a part of the heat transfer medium ( 108 ) through the memory space ( 120 ), thereby heated due to the exothermic reaction and via a discharge device ( 132 ), in particular one by means of the primary storage device ( 106 ) supplied heated heat transfer medium flow is.

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