DE102014216597B4 - Thermal storage device and method for operating a thermal storage device - Google Patents

Abstract

Heat storage device (100), comprising: - a primary storage device (106) which comprises a storage medium (110) and through which a heat transfer medium (108) can flow, so that, during a loading process, heat is transferred from the heat transfer medium (108) to the storage medium (110) and during a discharge process, heat can be transferred from the storage medium (110) to the heat transfer medium (108); - a receiving device (114) for receiving condensate (112) of the heat transfer medium (108) that forms during the loading process; Heat storage device (100), which is designed as a thermochemical storage device; - a fluid duct (116) for supplying the condensate (112) of the heat transfer medium (108) to the secondary storage device (118) of the heat storage device (100).

Description

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

When storing high-temperature heat, for example, a heated air flow can be fed to a solid in order to transfer heat from the air flow to the solid. In this case, water contained in the air flow can condense out, which can result in a reduced efficiency of the heat storage device.

the WO 2014/033132 A1 discloses a heat storage system in which a combination of a liquid storage and a latent heat storage is provided.

the DE 25 38 730 C2 discloses a method and a system for generating cold by means of a compression-absorption cycle process.

the DE 10 2010 044 200 A1 discloses a plant for exothermic high pressure wet chemical reactions.

the WO 2012/010709 A2 discloses a heat storage device with a special thermal coupling between a heat carrier and a heat storage medium.

the DE 21 46 917 A discloses a method and apparatus for generating peak power using heat stores.

the DE 41 21 460 A1 discloses a heat storage system with combined heat storage.

The present invention is based on the object of providing a heat storage device which can be operated simply and efficiently.

• eine Primärspeichervorrichtung, welche ein Speichermedium umfasst und welche mit einem Wärmeträgermedium durchströmbar ist, so dass bei einem Beladevorgang Wärme von dem Wärmeträgermedium auf das Speichermedium und bei einem Entladevorgang Wärme von dem Speichermedium auf das Wärmeträgermedium übertragbar ist;
• eine Aufnahmevorrichtung zur Aufnahme von sich beim Beladevorgang bildendem Kondensat des Wärmeträgermediums;
• eine Sekundärspeichervorrichtung der Wärmespeichervorrichtung, welche als thermochemische Speichervorrichtung ausgebildet ist;
• eine Fluidführung zur Zuführung des Kondensats des Wärmeträgermediums zu der Sekundärspeichervorrichtung der Wärmespeichervorrichtung.

According to the invention, this object is achieved by a heat storage device which comprises the following:

• a primary storage device which comprises a storage medium and through which a heat transfer medium can flow so that heat can be transferred from the heat transfer medium to the storage medium during a loading process and heat from the storage medium to the heat transfer medium during a discharging process;
• a receiving device for receiving condensate of the heat transfer medium which forms during the loading process;
• a secondary storage device of the heat storage device, which is designed as a thermochemical storage device;
• a fluid conduit 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 occurring during operation of the heat storage device can preferably be used to increase the efficiency of the heat storage device.

It can be advantageous if, in the primary storage device, heat can be transferred from the heat transfer medium to the storage medium and / or from the storage medium to the heat transfer medium through direct physical contact of the heat transfer medium with the storage medium.

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

It can be favorable if condensate of the heat transfer medium can be picked up by means of the pick-up device, which condensate is formed in the primary storage device and / or in a separate drying device for drying the heat transfer medium in particular during the loading process.

The drying device is, for example, a pre-drying device for pre-drying the heat transfer medium before it is supplied to the primary storage device for loading the same with heat.

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

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

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

It can be advantageous if the condensate of the heat transfer medium can be fed to the Ruths storage device after part of the sensible heat contained therein has been transferred to the thermochemical storage material of the secondary storage device.

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

In particular, it can be provided that the Ruths storage device of the receiving device is fluidically connected to a storage space of the secondary storage device in such a way that heat transfer medium from the Ruths storage device can be fed to the thermochemical storage material of the secondary storage device.

The heat transfer medium supplied to the Ruths storage facility is in particular condensate from the heat transfer medium.

The heat transfer medium discharged from the Ruths storage facility is in particular a vaporous heat transfer medium.

It can be advantageous if the receiving device comprises a compressor device, by means of which heat transfer medium discharged from the secondary storage device, in particular from a storage space of the secondary storage device, can be compressed. The discharged and compressed heat transfer medium can then, in particular, be fed to the Ruths storage unit.

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

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

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

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

The heat transfer medium can 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, the heat transfer medium withdrawn or discharged from the Ruths memory is then preferably water vapor.

The thermochemical storage material is preferably a hydrate forming material.

The present invention also relates to a method for operating a heat storage device.

In this regard, the invention is based on the object of providing a method by means of which a heat storage device can be operated simply and efficiently.

According to the invention, this object is achieved by a method for operating a heat storage device, in particular a heat storage device according to the invention, the method comprising: a heated heat transfer medium flowing through a storage medium of a primary storage device, heat being transferred from the heat transfer medium to the storage medium;
Taking up condensate of the heat transfer medium, which forms in particular when heat is supplied to the storage medium, by means of a receiving device of the heat storage device;
Feeding the condensate of the heat transfer medium to a secondary storage device of the heat storage device designed as a thermochemical 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 can be advantageous if the condensate of the heat transfer medium is fed to a heat exchanger. By means of the heat exchanger, heat is preferably transferred indirectly from the condensate to a thermochemical storage material of the secondary storage device.

An indirect transfer of heat is to be understood in particular as a transfer which takes place without material contact between the heat-emitting and the heat-absorbing material.

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

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

It can 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, is fed to a Ruths storage device of the receiving device.

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

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

Furthermore, it can be provided that part of the heat transfer medium is passed through the storage space. Because of the exothermic reaction, the part of the heat transfer medium is preferably heated. The part of the heat transfer medium is preferably discharged via a discharge device, in particular fed to a heat transfer medium flow heated by means of the primary storage device.

• Die Wärmespeichervorrichtung ist vorzugsweise eine Direktkontaktwärmespeichervorrichtung.

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 thermal storage device is preferably a direct contact thermal storage device.

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

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

In thermochemical energy storage, the heat of reaction from a chemical conversion is stored in the form of chemical energy. For example, a compound of type AB can be converted _{into components A and B by absorbing heat (positive enthalpy of reaction 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 reconversion 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 for as long as desired without loss. When A and B are brought together, the reaction proceeds in the opposite direction, whereby the _{heat of reaction ΔH R} then released must be dissipated and can be used elsewhere. $$\text{AWAY}+{\Delta }_{\text{R.}}\text{H}\to \text{A.}+\text{B.}$$

A heterogeneous gas-solid reaction is proposed here as the reaction system. The reason is the easy separation of products A and B due to different aggregate states. The molecules of these reactions are small, but the reaction enthalpies are large, so that potentially high storage densities can be achieved. The thermal loading of the storage tank is detected, for example, through dehydration (endothermic reaction), the discharge, for example, through hydration (exothermic reaction): $$\text{AWAY}={\Delta }_{\text{R.}}\text{H}\leftarrow \text{A.}+\text{B.}$$

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

It can be favorable if the heat storage device is a regenerator store in which a condensate drain is integrated. Depending on different process parameters such as pressure and temperature, different positions in the system diagram can prove to be advantageous.

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

A Ruths storage system is, in particular, a latent heat storage system which uses the liquid-vapor phase change, the heat transfer medium being steam. To feed in energy, steam is fed into a liquid reservoir, for example, in a large container, this condensing and thereby increasing the liquid temperature and the container pressure (saturation state). To remove steam, the steam space is opened so that the container pressure and the associated liquid temperature (saturation temperature) decrease. Here the saturated water is brought to the boil and thus used to generate steam.

In particular when the secondary storage device comprises a thermochemical storage material designed as a hydrate-forming material, the condensate of the heat transfer medium can preferably be used in an optimized manner. A hydration reaction can take place in particular when, parallel to the thermal discharge of the regenerator store (discharge process of the primary storage device), steam is removed from the Ruths store by opening a valve and passed through the storage space of the secondary storage device. The level of the equilibrium temperature of the hydration is preferably significantly higher than that of the dehydration, since this takes place at a higher pressure. This can be explained in particular by the Van-'t-Hoff equation: $$\text{ln}\left(p\right)=-\left(\left({\Delta }_{\text{R.}}\text{H}\right)/\text{RT}\right)+\text{K}$$

In this way, a higher temperature is preferably achieved when the secondary storage device is unloaded than when the same is loaded.

In particular, a heat transformation can thus be implemented by means of the secondary storage device.

Preferably, by using condensate from the primary storage device, the targeted shift of the chemical equilibrium in the direction of hydrate formation can also be used in accordance with the principle of Le Chatelier. The heat released during the reaction is preferably also transported by the emerging steam, which can preferably be fed to the heated heat transfer 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 store in power plant technology and / or as a wind heater.

Further preferred features and / or advantages of the invention are the subject matter of the following description and the graphic representation of an exemplary embodiment.

• 1 eine schematische Darstellung einer Wärmespeichervorrichtung, welche eine Primärspeichervorrichtung und eine Sekundärspeichervorrichtung zur Effizienzsteigerung der Primärspeichervorrichtung umfasst, wobei die Wärmespeichervorrichtung in einem Beladezustand vorliegt, in welchem der Primärspeichervorrichtung Wärme zugeführt wird; und
• 2 eine der 1 entsprechende schematische Darstellung der Wärmespeichervorrichtung, wobei die Wärmespeichervorrichtung in einem Entladezustand vorliegt, in welchem Wärme aus der Primärspeichervorrichtung entnommen wird.

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 is supplied with heat; and
• 2 one of the 1 corresponding schematic representation of the heat storage device, the heat storage device being 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 symbols in all figures.

One in the 1 and 2 The illustrated first embodiment of a heat storage device designated as a whole by 100 takes place, for example, in a compressed air storage power plant 102 Use.

By means of the heat storage device 100 can in particular heat from a in a main line 104 of the compressed air storage power plant 102 guided heat transfer medium flow are temporarily stored.

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

The primary storage device 106 can be flowed through with the heat transfer medium, which is referred to as 108 in the following, in order to remove heat from the heat transfer medium 108 to transfer to the storage medium designated below with 110 or to 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 This means that liquid water can form.

This water is especially condensate 112 of the heat transfer medium 108 .

The heat storage device 100 preferably comprises a receiving device 114 to collect the condensate 112 of the heat transfer medium 108 .

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

The heat storage device 100 furthermore comprises a fluid guide 116 , by means of which that from the primary storage device 106 removed condensate 112 a secondary storage device 118 the heat storage device 100 is feedable.

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

In addition, the heat storage device comprises 100 a heat exchanger 124 , by means of which the fluid guide 116 and that in the storage space 120 the secondary storage device 118 arranged thermochemical storage material 122 are 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 are transferred, in particular without material contact between the condensate 112 and the thermochemical storage material 122 .

The heat storage device 100 , especially the receiving device 114 , also includes a Ruths memory 126 which that from the primary storage device 106 removed condensate 112 of the heat transfer medium 108 is feedable.

By means of a drainage device 128 can in the Ruths store 126 contained condensate 112 from the Ruths memory 126 can 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 withdrawn liquid are compressed, in particular to the gas or the liquid to the Ruths memory 126 to feed.

A discharge device 132 the heat storage device 100 serves to discharge through the storage space 120 the secondary storage device 118 heat transfer medium passed through 108 .

Using a jet pump 134 the heat storage device 100 is that about the discharge device 132 discharged heat transfer medium 108 especially back into the heat transfer medium flow in the main line 104 of the compressed air storage power plant 102 initiable.

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

• Wenn mittels der Wärmespeichervorrichtung 100 Wärme aus dem Wärmeträgermedium 108 des Druckluftspeicherkraftwerks 102 gespeichert werden soll, so wird ein in der Hauptleitung 104 angeordnetes Ventil 136 geschlossen, um das in der Hauptleitung 104 geführte Wärmeträgermedium 108 in die Primärspeichervorrichtung 106 der Wärmespeichervorrichtung 100 einzuleiten.

The heat storage device described above 100 works like this:

• If by means of the heat storage device 100 Heat from the heat transfer medium 108 of the compressed air storage power plant 102 is to be saved, a will appear 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 thereby transfers that 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 can reside in the primary storage device 106 a condensate 112 of the heat transfer medium 108 form.

This condensate 112 of the heat transfer medium 108 is by means of the receiving device 114 recorded.

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

The condensate, which is still relatively hot 112 gives part of its heat by means of the heat exchanger 124 without material contact with the thermochemical storage material 122 in the storage space 120 the secondary storage device 118 away.

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

That through the heat transfer from the condensate 112 of the heat transfer medium 108 heated thermochemical storage material 122 , which is in particular a hydrate-forming storage material, releases 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 fed.

Since that is in the storage space 120 the secondary storage device 118 collecting gaseous or vaporous water has a lower pressure than the pressure in Ruths memory 126 may have, that is from the storage space 120 discharged gaseous or vaporous water preferably initially by means of the compressor device 130 compressed before it goes to Ruths memory 126 is fed.

In the case of the heat storage device 100 is thus in the in 1 load state shown in the primary storage device 106 accumulating condensate 112 for dehydrating the thermochemical storage material 122 the secondary storage device 118 used and finally the Ruths memory 126 fed.

By switching the valves 136 the heat storage device 100 can the heat storage device 100 in the in 2 shown discharge state are brought.

In this discharge state it becomes a heat transfer medium 108 by 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.

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

In particular, the heat transfer medium 108 from the Ruths memory 126 removed and placed in the storage room 120 the secondary storage device 118 initiated.

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

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

Through chemical reaction between the heat transfer medium 108 and the thermochemical storage material 122 heat is preferably released. In particular, the thermochemical storage material is hydrated 122 instead of.

The amount from Ruth's memory 126 the storage space 120 the secondary storage device 118 supplied heat transfer medium 108 is chosen so that only part of the heat transfer medium 108 with the thermochemical storage material 122 reacts and is therefore used to release heat. The other part of the heat transfer medium 108 which corresponds to the storage space 120 is supplied, is heated by means of the released heat and via the discharge device 132 from the storage room 120 discharged. This part of the heat transfer medium 108 is thus only due to the storage space 120 the secondary storage device 118 passed through.

Using the jet pump 134 this is done via the discharge device 132 discharged heat transfer medium 108 finally again the one in the main line 104 guided heat transfer medium flow of the compressed air storage device 102 fed.

Because that's from Ruth's memory 126 removed heat transfer medium 108 by the secondary storage device 118 is passed through and heated in the process, this can also initially be carried out as condensate 112 unwanted heat transfer medium 108 contribute to the provision of a heated heat transfer medium flow.

The heat storage device 100 can thus have a high level of efficiency.

List of reference symbols

100

Heat storage device

102

Compressed air storage power plant

104

Main line

106

Primary storage device

108

Heat transfer medium

110

Storage medium

112

condensate

114

Cradle

116

Fluid guidance

118

Secondary storage device

120

Storage space

122

Storage material

124

Heat exchanger

126

Ruths store

128

Drainage device

130

Compressor device

132

Discharge device

134

Jet pump

136

Valve

Claims (18)

A thermal storage device (100) comprising: - A primary storage device (106) which comprises a storage medium (110) and through which a heat transfer medium (108) can flow, so that during a loading process heat from the heat transfer medium (108) to the storage medium (110) and during a discharge process heat from the Storage medium (110) can be transferred to the heat transfer medium (108); - A receiving device (114) for receiving condensate (112) of the heat transfer medium (108) which forms during the loading process; - A secondary storage device (118) of the heat storage device (100), which is designed as a thermochemical storage device; - A fluid duct (116) for feeding 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) to the storage medium (110) and / or from the storage medium (110) to the heat transfer medium (108) through direct material contact of the heat transfer medium (108) with the Storage medium (110) is transferable. Heat storage device (100) according to one of the Claims 1 or 2 , characterized in that by means of the receiving device (114) condensate (112) of the heat transfer medium (108) can be picked up, which is formed during 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 the Claims 1 until 3 , characterized in that the heat storage device (100) comprises a heat exchanger (124), by means of which heat can be transferred from the condensate (112) of the heat transfer medium (108) to a thermochemical storage material (122) of the secondary storage device (118). Heat storage device (100) according to one of the Claims 1 until 4th , characterized in that the receiving device (114) comprises a Ruths storage tank (126) which is fluidly connected to the heat exchanger (124) of the heat storage device (100), in particular in such a way that condensate (112) passed through the heat exchanger (124) of the heat transfer medium (108) can be fed to the Ruths memory (126). Heat storage device (100) according to Claim 5 , characterized in that the Ruths memory (126) of the receiving device (114) is fluidically connected to a storage space (120) of the secondary storage device (118), in particular such that the heat transfer medium (108) from the Ruths memory (126) to the thermochemical Storage material (122) of the secondary storage device (118) can be fed. Heat storage device (100) according to one of the Claims 1 until 6th , characterized in that the receiving device (114) comprises a compression device (130) by means of which the heat transfer medium (108) discharged from the secondary storage device (118) can be compressed and, in particular, fed to the Ruths storage device (126). Heat storage device (100) according to one of the Claims 1 until 7th , characterized in that the heat storage device (100) comprises a discharge device (132) by means of which heat transfer medium (108) passed through the storage space (120) of the secondary storage device (118) can be discharged and in particular can be fed to a heat transfer medium flow heated by means of the primary storage device (106). Heat storage device (100) according to one of the Claims 1 until 8th , 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 the Claims 1 until 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 the Claims 1 until 10 , wherein the method comprises: - A heated heat transfer medium (108) flowing through a storage medium (110) of a primary storage device (106), heat being transferred from the heat transfer medium (108) to the storage medium (110); - Taking up condensate (112) of the heat transfer medium (108), which forms in particular when heat is supplied 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 (118) of the heat storage device (100) designed as a thermochemical storage device. Procedure according to Claim 11 , characterized in that the condensate (112) of the heat transfer medium (108) is fed to a heat exchanger (124) and that by means of the heat exchanger (124) heat from the condensate (112) is transferred indirectly to a thermochemical storage material (122) of the secondary storage device (118) is transmitted. Procedure according to Claim 12 , characterized in that the thermochemical storage material (122) of the secondary storage device (118) reacts chemically and / or physically when absorbing heat and thereby emits heat transfer medium (108), in particular gaseous heat transfer medium (108). Procedure according to Claim 13 , characterized in that the heat transfer medium (108) released from the thermochemical storage material (122) is compressed by means of a compressor device (130) and in particular fed to a Ruths storage device (126) of the receiving device (114). Method according to one of the Claims 11 until 14th , 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), is fed to a Ruths storage device (126) of the receiving device (114). Procedure according to Claim 15 , characterized in that the condensate (112) of the heat transfer medium (108) is removed in vapor form from the Ruths memory (126) and introduced as heat transfer medium vapor into a storage space (120) of the secondary storage device (118). Procedure according to Claim 16 , characterized in that at least part of the heat transfer medium (108) reacts exothermically with a thermochemical storage material (122) of the secondary storage device (118) arranged in the storage space (120) of the secondary storage device (118). Procedure according to Claim 17 , characterized in that part of the heat transfer medium (108) is passed through the storage space (120), heated due to the exothermic reaction and discharged via a discharge device (132), in particular fed to a heat transfer medium flow heated by the primary storage device (106).

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