DE102013217607A1 - Method of providing steam and steam delivery device - Google Patents

Abstract

In order to provide a method for providing steam, in particular for providing stored electrical energy, in which the available electrical and thermal energy can be used particularly efficiently, it is proposed that the method comprises: providing a liquid; Heating the liquid using waste heat of a heat engine; Evaporating the liquid using heat from a heat storage device to obtain steam; Heating, in particular overheating, the steam using waste heat of the heat engine.

Description

The present invention relates to a method for providing steam, in particular for providing stored electrical energy.

Electrical energy can be stored for example by conversion to heat by means of thermal energy storage. For this purpose, thermal energy storage, which store sensitive heat at maximum temperatures of, for example, about 500 ° C, with capacities in the GWh range already in commercial use. For example, excess electrical energy of a power plant can be used directly to supply heat to a memory. The heat is then preferably used at a later time to operate a cycle in which the heat is converted into mechanical work. This can in turn be used to drive a generator.

The discharge process of such a thermal energy storage is subject to the limitations of the second law of thermodynamics, from which follows that from a heat quantity of the average temperature T _m in a process with the waste heat temperature T _{waste heat} only a theoretical maximum proportion of 1 - T _m / T _{waste heat} in mechanical work can be converted to drive a generator. In a technical implementation, it is expected that the storage efficiency will be in the range of about 35% to about 40%. The greater part of the supplied electrical energy is thus converted into initially unusable low-temperature heat.

Basically, the mechanical energy and / or electrical energy can be used to transform heat to a higher temperature (so-called heat pump) and thus increase the ability to work this heat. By means of such a heat pump, heat can be removed from a cold storage and fed to this hot storage for additional heating of a hot storage. The energy in the hot storage is thus the sum of the supplied electrical energy and the heat removed from the cold storage. Accordingly, for the drive of an energy converter (generator) during discharge at the same originally recorded electrical energy, a larger amount of heat at a high temperature level is available. The theoretical maximum value of the electrical energy emitted during the discharge corresponds to the value of the electrical energy supplied during the loading. In an ideal implementation of a storage concept with fully reversible operating energy converters and without thermal losses to the environment, the stored electrical energy can preferably be completely removed again as electrical energy during the discharge. Thus theoretically a storage efficiency of 100% can be achieved. The storage efficiency is preferably independent of the thermal efficiency. However, given a given electrical energy to be discharged upon discharge, the heat to be supplied by the hot accumulator is given as the quotient of the electrical energy released during the discharge divided by the thermal efficiency. Thus, the highest possible thermal efficiency is desirable.

The present invention has for its object to provide a method for providing steam, in particular for the storage and provision of electrical energy, in which the available electrical and thermal energy can be used very efficiently.

• – Bereitstellen einer Flüssigkeit;
• – Erhitzen der Flüssigkeit unter Verwendung von Abwärme einer Wärmekraftmaschine;
• – Verdampfen der Flüssigkeit unter Verwendung von Wärme aus einer Wärmespeichervorrichtung, so dass Dampf erhalten wird;
• – Erhitzen, insbesondere Überhitzen, des Dampfes unter Verwendung von Abwärme der Wärmekraftmaschine.

This object is achieved according to the invention by a method for providing steam, which comprises:

• - Providing a liquid;
• Heating the liquid using waste heat from a heat engine;
• Vaporizing the liquid using heat from a heat storage device so that steam is obtained;
• - Heating, in particular overheating, of the steam using waste heat of the heat engine.

By virtue of the fact that according to the invention the evaporation of the liquid takes place using heat from a heat storage device, the steam can be provided in a particularly energy-efficient manner.

The term "steam" is to be understood in particular as superheated steam, superheated steam, saturated steam and / or dry steam.

The liquid and / or the steam comprise, for example, water or are formed from water. However, other liquids or vapors may be provided.

The heat storage device is preferably loaded, that is heated, using electrical energy.

Preferably, electrical energy may be stored in the method of providing steam by supplying heat to the heat storage device using electrical energy.

The heat storage device can be loaded, for example, by means of a heat pump device, in particular by means of an electrically operated heat pump device.

In such a heat pump device heat is preferably removed from a cold storage and fed to a hot storage.

For this purpose, the heat pump device comprises, for example, a compressor device for compressing and / or releasing a fluid in order to remove heat from the cold accumulator and to supply it to the hot accumulator.

The cold storage, for example, be the environment, so that heat from the environment, in particular from surrounding air, is removed.

However, it can also be provided that the cold accumulator is a low-temperature heat source, for example a waste heat source, a geothermal heat source, an industrial waste heat source and / or a solar thermal device.

By means of the heat pump device, the heat storage device is preferably heated to a temperature which allows the liquid to evaporate by supplying the liquid to the heat storage device and / or thermally contacting the liquid with the heat storage device. In particular, low-temperature waste heat can thereby be upgraded preferably.

In one embodiment of the invention it is provided that the liquid for heating the same again in thermal contact with an exhaust device of the heat engine, then for vaporizing the liquid in thermal contact with the heat storage device and subsequently for heating, in particular superheating, the steam again in thermal contact is brought with the exhaust device.

The liquid and the steam are preferably conducted in a closed circuit, in particular in a common closed circuit.

The liquid is thus preferably evaporated to obtain the vapor. The steam is then preferably re-liquefied to obtain the liquid.

The steam, in particular the superheated steam, is preferably used for driving a steam turbine device.

The steam is thereby preferably cooled.

Before being supplied to a turbine apparatus of the steam turbine apparatus, the steam is preferably compressed.

It can be provided that the steam is compressed in several stages.

It can be advantageous if liquid is added to the vapor. The steam can thereby be cooled, in particular by the evaporation of the added liquid. As a result, the amount of steam and / or the pressure can be increased.

It can be provided that the vapor is added in several stages liquid.

In particular, it can be provided that a plurality of successively connected stages for compression and liquid addition are provided for increasing the amount of steam and the vapor pressure.

The present invention further relates to a method for storing and subsequently providing electrical energy.

The invention is in this respect the task of storing the electrical energy with high efficiency and thus low losses.

• – Beladen einer Wärmespeichervorrichtung mit Wärme unter Verwendung von elektrischer Energie;
• – Entladen der Wärmespeichervorrichtung durch Übertragen der in der Wärmespeichervorrichtung gespeicherten Wärme auf eine Flüssigkeit, so dass die Flüssigkeit verdampft und somit Dampf bereitgestellt wird, insbesondere gemäß dem erfindungsgemäßen Verfahren zum Bereitstellen von Dampf;
• – Nutzen des Dampfes zum Antreiben einer Dampfturbinenvorrichtung zur Erzeugung von elektrischer Energie.

This object is achieved according to the invention by a method for storing and subsequently providing electrical energy, comprising:

• - Loading a heat storage device with heat using electrical energy;
• Discharging the heat storage device by transferring the heat stored in the heat storage device to a liquid, so that the liquid evaporates and thus steam is provided, in particular according to the method according to the invention for providing steam;
• - Using the steam to drive a steam turbine apparatus for generating electrical energy.

The method according to the invention for storing and subsequently providing electrical energy preferably has one or more of the features and / or advantages described in connection with the method according to the invention for providing steam.

The present invention further relates to a steam delivery apparatus for providing steam.

The invention is in this respect the task of providing a steam supply device, by means of which the available thermal and / or electrical energy is as efficient as possible for the provision of steam available.

This object is achieved by a steam supply device for providing steam, which comprises a heat engine, a heat storage device and a fluid guide, wherein the heat engine by means of the fluid guide, a liquid can be supplied, so that the liquid can be heated using waste heat of the heat engine, the Liquid can be supplied by means of the fluid guide of the heat storage device, so that the liquid is heatable using heat from the heat storage device, and wherein a vapor obtainable thereby by means of the fluid guide of the heat engine can be fed, so that the steam using waste heat of the heat engine heated, in particular overheatable, is.

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

Preferably, the heat engine, in particular an exhaust device of the heat engine, thermally coupled to the fluid guide or coupled.

Further, preferably, the heat storage device is thermally coupled to the fluid guide or coupled.

Preferably, the steam supply device comprises one or more heat exchangers, by means of which the fluid guide is thermally coupled to the heat engine and / or with the heat storage device or coupled.

It may be advantageous if the steam supply device comprises an electrically operable loading device, in particular a heating device, for example a heat pump device, by means of which the heat storage device for loading the same heat can be supplied.

It can be advantageous if the heat engine comprises an exhaust device.

The fluid guide is preferably configured such that the liquid for heating the same initially in thermal contact with the exhaust device, then for vaporizing the liquid in thermal contact with the heat storage device and then the steam for heating, in particular overheating, of the same in thermal contact with the exhaust device can be brought.

The heat storage device is preferably a latent heat storage device and / or a device for storing sensible heat.

It may be favorable if the fluid guide is a closed fluid guide, by means of which the liquid and the steam can be guided in a closed circuit. In particular, by means of the fluid guide, the liquid and the steam can be conducted in a closed circuit, wherein the liquid is evaporated alternately and the resulting vapor is condensed.

The steam delivery device according to the invention is particularly suitable for use in a gas and steam turbine power plant comprising such a steam supply device.

Such a gas-and-steam turbine power plant preferably has one or more of the features and / or advantages described in connection with the methods according to the invention and / or the devices according to the invention.

The present invention further relates to a storage device for storing and subsequently providing electrical energy.

The invention is in this respect the task of providing a storage device by means of which electrical energy with high efficiency and thus low losses can be stored.

This object is achieved according to the invention by a storage device for storing and subsequently providing electrical energy, which comprises a heat storage device, an electrically operable loading device, in particular a heating device, for supplying heat to the heat storage device using electrical energy, a steam supply device, in particular a steam supply device according to the invention, and a steam turbine device for generating electrical energy, wherein a fluid can be supplied to the heat storage device by means of a fluid guide of the steam supply device, wherein the liquid by means of the heat storage device is vaporisable and wherein the thus obtainable steam for generating electrical energy of the steam turbine device can be fed.

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

It may be favorable if the loading device is a heat pump device.

Preferably, by means of the heat pump device, a fluid flow, in particular a gas flow, are compressed in order to increase its temperature. In particular, it can be provided that the temperature of the fluid flow is increased in several stages.

The heat contained in the fluid stream is preferably transferred to the heat storage device.

Residual heat contained in the fluid stream is preferably used for driving a generator device and / or for driving the compressor device for compressing the fluid flow, for example by means of a turbine device.

Preferably, the vapor is compressed to a pressure of at least about 50 bar, in particular at least about 80 bar, for example about 100 bar.

Furthermore, it may be provided that the steam is heated to a temperature of at least about 400 ° C, for example at least about 500 ° C, in particular about 560 ° C.

By using the heat from the heat storage device to evaporate the liquid, the step of evaporating in the provision of superheated steam from the liquid from the superheating steps by means of the exhaust device of the heat engine is preferably excluded.

The heat engine is in particular an internal combustion engine, in particular an internal combustion engine or a gas turbine device.

Furthermore, the methods and / or devices according to the invention can have one or more of the features and / or advantages described below:
Preferably, electrical energy in a power range between about 5 and about 500 megawatts may be provided as needed, particularly over a period of, for example, about one hour to about twelve hours, for example. Preferably, the storage device for storage of electrical energy is independent of location operable, in particular in contrast to pumped storage power plants.

The storage device may preferably be used in the immediate vicinity of wind power plants and / or photovoltaic power plants.

Preferably, by using the heat from the heat storage device to evaporate the liquid, the temperature difference between the liquid and / or the steam in the exhaust device of the heat engine is minimized, whereby an increase in efficiency in the use of the waste heat of the heat engine is possible.

In particular for loading the heat storage device, a fluid flow, in particular a gas flow, is preferably compressed in multiple stages in order to increase the temperature of the fluid flow.

It can be provided that heat is supplied to the fluid flow at different points and at different compression stages.

The exhaust device of the heat engine is in particular a waste heat boiler, which is used for generating steam, in particular by utilizing the heat of the exhaust gases. In the power plant area, turbine waste gases are preferably used in waste heat boilers to generate steam. The generated steam may, for example, drive a turbine.

It can be provided that a plurality of steam circuits for loading the heat storage device connected in series, that is cascaded, are.

For example, in a first steam cycle, ammonia (NH ₃ ) can be compressed by absorbing ambient heat and with an electrical power of, for example, 0.382 W, so that condensation at 110 ° C. is possible. With the released heat of condensation is then evaporated in a second steam cycle water at about 100 ° C. Part of the heat released in the ammonia during the recooling of the condensate can be supplied to the heat storage device, for example. In a multi-stage compressor, the pressure and temperature of the water vapor can be increased to, for example, about 105 bar and / or 390 ° C.

The heat is then preferably supplied to the heat storage device. The thermal power is for example about 1.858 W.

For example, during discharge, the previously stored heat may be supplied to a reheat steam cycle with the maximum process temperature being at about 370 ° C, for example. During discharge, for example, about 71% of the originally supplied electrical energy is then released again.

For example, an ammonia steam cycle may be eliminated if a waste heat source is available that allows evaporation of water at about 100 ° C. The waste heat can then be supplied for example directly to the steam cycle. For loading, for example, only an electrical power of about 0.618 W is required. With such a load and the discharge as described above, it is then preferable for the electrical energy delivered to exceed the value of the electrical energy supplied during the loading, for example by approximately 15%.

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

In the drawings show:

1 a schematic perspective view of a first embodiment of a combined cycle power plant, in which the guided in a steam cycle fluid is preheated by means of an exhaust device, evaporated and superheated;

2 a schematic diagram for illustrating the heat transfer from the exhaust gas to the guided in the steam cycle fluid according to the in 1 illustrated embodiment of the combined cycle power plant;

3 a schematic representation of a second embodiment of a combined cycle power plant, in which the guided in a steam cycle fluid is evaporated by means of a heat storage device, wherein the heat storage device is in a discharge state;

4 one of the 3 corresponding schematic representation of the second embodiment of the gas-and-steam turbine power plant, wherein the heat storage device is in a loading state;

5 one of the 2 corresponding diagram illustrating the heat transfer from the exhaust gas to the guided in the steam cycle fluid according to that in the 3 and 4 illustrated second embodiment of the combined cycle power plant;

6 a schematic representation of a third embodiment of a combined cycle power plant, in which a solar thermal device of a solar device for loading a heat storage device is provided; and

7 a schematic representation of a fourth embodiment of a combined cycle power plant, in which a photovoltaic device of a solar device for driving a heat pump device is provided, wherein by means of the heat pump device, a heat storage device is loaded.

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

An in 1 illustrated first embodiment of a whole as 100 referred gas-and-steam turbine power plant comprises a heat engine 102 , in particular a gas turbine device 104 , and a steam turbine apparatus 106 ,

The gas turbine device 104 includes a compressor device 108 , a combustion chamber device 110 , a turbine device 112 , a generator device 114 and an exhaust device 116 ,

By means of the compressor device 108 the gas turbine device 104 Fuel and / or oxidizer can be compressed.

In the combustion chamber device 110 the gas turbine device 104 a mixture of fuel and / or oxidizer is burned.

The exhaust gases from the combustion chamber device 110 be about the turbine device 112 relaxed.

The turbine device 112 and the generator device 114 are on a common wave 118 the gas turbine device 104 arranged so that by means of the turbine device 112 generated rotational movement on the generator device 114 transferable and by means of the generator device 114 is convertible into electrical energy.

Also the compressor device 108 is preferably on the shaft 118 arranged and / or with the wave 118 coupled, so that by means of the turbine device 112 generated rotational movement of the shaft 118 also for driving the compressor device 108 is usable.

That in the turbine device 112 relaxed exhaust gas from the combustion chamber device 110 is via the exhaust device 116 dissipated.

The exhaust device 116 includes in particular a waste heat boiler 120 ,

To use the heat contained in the exhaust gas is the steam turbine device 106 intended.

The steam turbine device 106 includes a steam cycle 122 , a fluid guide 124 , a turbine device 126 , a generator device 128 and several heat exchangers 130 ,

By means of the fluid guide 124 the steam turbine device 106 may be a fluid in a circuit, in particular in the steam cycle 122 be guided.

For driving the fluid may be a pump device 132 be provided.

By means of the turbine device 126 can in the steam cycle 122 generated steam can be relaxed, in particular to the rotational movement generated thereby to the generator device 128 to transmit and generate electrical energy.

By means of the heat exchanger 130 can that in the fluid guide 124 guided fluid supplied heat and / or out of the fluid guide 124 guided fluid heat are removed.

At the in 1 illustrated embodiment of the gas-and-steam turbine power plant 100 are in particular three heat exchangers 130 provided by means of which the fluid guide 124 with the exhaust device 116 the gas turbine device 104 is coupled.

By means of the heat exchanger 130 are a preheater 134 , an evaporator 136 and a superheater 138 the steam turbine device 106 educated.

By means of the preheater 134 can in the fluid guide 124 guided liquid fluid, that is, a liquid to be preheated.

By means of the evaporator 136 For example, the fluid, in particular the liquid, can be vaporized.

By means of the superheater 138 the steam can be overheated.

The heat exchanger 130 are with the exhaust device 116 so coupled that from the combustion chamber device 110 discharged and through the turbine device 112 passed exhaust gas first to the superheater 138 , then the evaporator 136 and finally the preheater 134 is supplied.

By means of the steam turbine device 106 can thus be using the exhaust gas from the gas turbine apparatus 104 Steam will be provided. In particular, superheated steam can be provided.

The steam turbine device 106 is or includes a steam delivery device 140 ,

The gas and steam turbine power plant described above 100 works as follows:
In the combustion chamber device 110 the gas turbine device 104 be fuel and oxidizer, which optionally by means of the compressor device 108 previously compacted, chemically reacted. The energy released in this case is by means of the turbine device 112 for driving the generator device 114 the gas turbine device 104 and thus used for generating electrical energy.

That from the turbine device 112 discharged exhaust gas is via the exhaust device 116 the gas turbine device 104 dissipated.

The energy still present in the form of heat in the exhaust gas is produced by means of the steam turbine device 106 used by the in the fluid guide 124 guided fluid by means of the heat exchanger 130 , in particular by means of the preheater 134 , by means of the evaporator 136 and by means of the superheater 138 , preheated, evaporated and finally overheated. That in the fluid guide 124 guided fluid is doing in liquid form the preheater 134 fed and finally as superheated steam from the superheater 138 dissipated.

The superheated steam becomes the turbine device 126 which is connected to the generator device 128 is coupled, so that the energy contained in the superheated steam can be used to generate electrical energy.

Subsequently, the steam is cooled and liquefied and thus stands as a liquid for reuse, in particular for renewed supply to the preheater 134 , ready.

The fluid is thus in a steam cycle 122 in which the fluid is present alternately as a liquid and as a vapor.

As in particular from the illustration of heat transfer in 2 As can be seen, the exhaust gas and the fluid flow through the exhaust device 116 the gas turbine device 104 or the associated heat exchanger 130 in opposite directions.

Thus, that comes by means of the superheater 138 to superheated fluid first with the very hot exhaust thermally in contact while the means of the evaporator 136 to be evaporated fluid thermally comes into contact with the already slightly cooled exhaust gas. The preheating of the fluid by means of the preheater 134 used exhaust gas then has due to the already made heat to the superheater 138 and the evaporator 136 an even lower temperature.

In 2 the ranges I, II and III are indicated. Region I is the area in which the fluid by means of the preheater 134 is preheated. The area II is the area where the fluid by means of the evaporator 136 is evaporated. Region III is the region in which the fluid passes through the superheater 138 is overheated.

As 2 can be seen, resulting in particular in the region II, that is, during evaporation, high temperature differences between the exhaust gas and the fluid. Even without heat loss to the environment, the heat transfer is associated with a reduction in working capacity, which depends on the temperature difference between the working media.

The efficiency of the steam turbine device 106 the first embodiment of the combined cycle power plant 100 is therefore not optimal.

One in the 3 and 4 illustrated second embodiment of a combined cycle power plant 100 is different from the one in 1 illustrated first embodiment essentially in that the steam supply device 140 the steam turbine device 106 with a storage device 142 for the storage and subsequent provision of electrical energy cooperates or part of such a storage device 142 is.

The storage device 142 in particular comprises a heat storage device 144 , For example, a latent heat storage device 146 ,

The storage device 142 further comprises a loading device 148 , in particular a heating device 150 For example, a heat pump device 152 ,

By means of the loading device 148 can the heat storage device 144 preferably be charged using electrical energy.

In particular 3 it can be seen in the in the 3 and 4 illustrated second embodiment of the combined cycle power plant 100 provided that only the preheater 134 and the superheater 138 thermally with the exhaust device 116 are coupled.

The evaporator 136 is with the heat storage device 144 coupled.

At the in 3 illustrated discharge of the heat storage device 144 That is, in the use of the in the heat storage device 144 stored heat is the in the fluid guide 124 the steam turbine device 106 thus guided fluid using exhaust gas from the gas turbine apparatus 104 preheated (area I), then using heat from the heat storage device 144 vaporized (region II) and finally using heat from the exhaust gas of the gas turbine apparatus 104 overheated (area III).

As in particular the associated diagram to illustrate the heat transfer in 5 As can be seen, there is thus a clear approximation of the temperature curve of the fluid to the temperature curve of the exhaust gas in the transfer of heat from the exhaust gas from the gas turbine apparatus 104 to the fluid in the fluid guide 124 ,

Area II (see in comparison 2 ), in which the fluid is evaporated, is thus in the in the 3 and 4 illustrated second embodiment of the combined cycle power plant 100 outsourced to achieve increased efficiency.

In particular, the loss of operability of the exhaust heat can be reduced thereby.

In 4 is the second embodiment of the combined cycle power plant 100 in a loading state in which the heat storage device 144 is loaded.

For this purpose, by means of the loading device 148 the heat storage device 144 Heat supplied.

This can be done in particular by means of the heat pump device 152 done using electrical energy.

The for driving the heat pump device 152 used electrical energy is thus converted into thermal energy, that is heat, and in particular for later use in the heat storage device 144 saved.

The loading can be done, for example, two stages and / or using low-temperature heat. In particular, the heat storage device 144 preferably be brought to a temperature which is sufficient to the evaporation of the in the fluid guide 124 guided fluid in the discharge of the heat storage device 144 to enable.

In this embodiment of the combined cycle power plant 100 For example, it is possible to reduce the startup time, which in particular depends on the permissible temporal temperature gradients in the steam supply device 140 depends.

As the heat storage device 144 , which is used for steam generation, already at the end of the loading process, the operating temperature of the subsequent discharge process, have essential parts of the steam delivery device 140 preferably always the required operating temperature, so that a starting process of the gas-and-steam turbine power plant 100 can be abbreviated.

Incidentally, the right in the 3 and 4 illustrated second embodiment of the combined cycle power plant 100 in terms of structure and function with the in 1 illustrated first embodiment, so that reference is made to the above description in this respect.

An in 6 illustrated third embodiment of a combined cycle power plant 100 is different from the one in the 3 and 4 illustrated second embodiment essentially in that a solar device 154 is provided.

The solar device 154 includes in particular a solar thermal device 156 and a photovoltaic device 158 ,

By means of the solar thermal device 156 Low-temperature heat is preferably provided, in particular by this low-temperature heat for loading the heat storage device 144 and thus to increase the efficiency of the combined cycle power plant 100 to use.

Preferably, by means of the solar thermal device 156 Generates steam whose pressure is slightly above atmospheric pressure.

By using the low-temperature heat can by means of the photovoltaic device 158 provided and stored electrical energy is preferably stored particularly efficient.

In particular, by the use of the solar thermal device 156 provided low-temperature heat, for example, the electrical energy emitted during the discharge are about 15% higher than the electrical energy that was supplied during the loading.

Assuming that the thermal efficiency of the solar thermal device 156 is about 60%, that is for the solar thermal device 156 required area about half the area of a photovoltaic device 158 if its efficiency is about 15% and this photovoltaic device 158 the means of solar thermal device 156 provide provided thermal energy in the form of electrical energy.

Incidentally, the in 6 illustrated third embodiment of the gas-and-steam turbine power plant 100 in terms of structure and function with in the 3 and 4 illustrated second embodiment, so that reference is made to the above description in this respect.

An in 7 illustrated fourth embodiment of a combined cycle power plant 100 is different from the one in 6 illustrated third embodiment substantially in that instead of the solar thermal device 156 for loading the heat storage device 144 a loading device 148 is provided, which is a photovoltaic device 158 and a separate loading cycle 160 , For example, an ammonia cycle includes.

By means of the photovoltaic device 158 the loading device 148 may preferably be a heat pump device (not shown) 152 the loading device 148 be electrically powered to heat for loading the heat storage device 144 provide.

Preferably, when using photovoltaic devices 158 for loading the heat storage device 144 Compressors are used, which are driven by direct current, while in the discharge preferably generator devices 128 be used to generate the alternating current.

The storage device 142 thus preferably assumes the function of an inverter, so that in particular the investment costs can be reduced.

Incidentally, the in 7 illustrated fourth embodiment of the combined cycle power plant 100 in terms of structure and function with the in 6 illustrated third embodiment, so that reference is made to the above description thereof in this regard.

LIST OF REFERENCE NUMBERS

100

 Gas and steam turbine power plant

102

 Heat engine

104

 Gas turbine device

106

 steam device

108

 compressor device

110

 combustion chamber device

112

 turbine device

114

 generator device

116

 exhaust device

118

 wave

120

 waste heat boiler

122

 Steam cycle

124

 fluid guide

126

 turbine device

128

 generator device

130

 Heat exchanger

132

 pump device

134

 preheater

136

 Evaporator

138

 superheater

140

 Steam supply device

142

 storage device

144

 Heat storage device

146

 Latent heat storage device

148

 loader

150

 heater

152

 heat pump device

154

 solar device

156

 solar thermal device

158

 photovoltaic device

160

 Beladekreislauf

Claims (17)

A method of providing steam comprising: providing a liquid; Heating the liquid using waste heat from a heat engine ( 102 ); Vaporizing the liquid using heat from a heat storage device ( 144 ), so that steam is obtained; Heating, in particular superheating, of the steam using waste heat from the heat engine ( 102 ). Method according to claim 1, characterized in that the heat storage device ( 144 ) is charged using electrical energy. Method according to one of claims 1 or 2, characterized in that the heat storage device ( 144 ) by means of a heat pump device ( 152 ) is loaded. Method according to one of claims 1 to 3, characterized in that the liquid for heating the first in thermal contact with an exhaust device ( 116 ) of the heat engine ( 102 followed by evaporation of the liquid in thermal contact with the heat storage device ( 144 ) and thereafter for heating, in particular superheating, the steam again in thermal contact with the exhaust device ( 116 ) is brought. Method according to one of claims 1 to 4, characterized in that the liquid and the steam in a closed circuit ( 122 ). Method according to one of claims 1 to 5, characterized in that the steam, in particular the superheated steam, for driving a steam turbine device ( 106 ) is being used. A method according to claim 6, characterized in that the steam before being fed to a turbine device ( 126 ) of the steam turbine device ( 106 ) is compressed in several stages. Method according to one of claims 6 or 7, characterized in that the vapor is added liquid. A method for storing and subsequently providing electrical energy, comprising: - loading a heat storage device ( 144 ) with heat using electrical energy; - unloading the heat storage device ( 144 ) by transmitting in the heat storage device ( 144 ) stored on a liquid, so that the liquid evaporates and thus steam is provided, in particular according to a method according to one of claims 1 to 8; The use of steam to drive a steam turbine device ( 106 ) for generating electrical energy. Steam delivery device ( 140 ) for providing steam, comprising Heat engine ( 102 ), a heat storage device ( 144 ) and a fluid guide ( 124 ), wherein the heat engine ( 102 ) by means of the fluid guide ( 124 ) is a liquid supplied, so that the liquid using waste heat of the heat engine ( 102 ) is heated, wherein the liquid by means of the fluid guide ( 124 ) of the heat storage device ( 144 ) is supplied, so that the liquid using heat from the heat storage device ( 144 ) is vaporisable, whereby a vapor obtainable thereby by means of the fluid guide ( 124 ) of the heat engine ( 102 ) is supplied, so that the steam using waste heat of the heat engine ( 102 ) is heatable, in particular overheatable, is. Steam delivery device ( 140 ) according to claim 10, characterized in that the steam supply device ( 140 ) an electrically operable loading device ( 148 ), in particular heating device ( 150 ), by means of which of the heat storage device ( 144 ) can be supplied for loading the same heat. Steam delivery device ( 140 ) according to one of claims 10 or 11, characterized in that the heat engine ( 102 ) an exhaust device ( 116 ) and that the fluid guide ( 124 ) is designed such that the liquid for heating the same initially in thermal contact with the exhaust device ( 116 followed by evaporation of the liquid in thermal contact with the heat storage device ( 144 and thereafter the steam for heating, in particular overheating, thereof in thermal contact with the exhaust device ( 116 ) can be brought. Steam delivery device ( 140 ) according to one of claims 10 to 12, characterized in that the heat storage device ( 144 ) a latent heat storage device ( 146 ). Steam delivery device ( 140 ) according to one of claims 10 to 13, characterized in that the fluid guide ( 124 ) a closed fluid guide ( 124 ) by means of which the liquid and the vapor are in a closed circuit ( 122 ) are feasible. Gas and steam turbine power plant ( 100 ) comprising a steam delivery device ( 140 ) according to one of claims 10 to 14, wherein the heat engine ( 102 ) a gas turbine apparatus ( 104 ). Storage device ( 142 ) for storing and subsequently providing electrical energy, comprising a heat storage device ( 144 ), an electrically operable loading device ( 148 ), in particular heating device ( 150 ), for supplying heat to the heat storage device ( 144 ) using electrical energy, a steam delivery device ( 140 ), in particular according to one of claims 10 to 14, and a steam turbine device ( 106 ) for generating electrical energy, wherein by means of a fluid guide ( 124 ) of the steam delivery device ( 140 ) of the heat storage device ( 144 ) is supplied to a liquid, wherein the liquid by means of the heat storage device ( 144 ) and wherein the steam obtainable thereby for generating electrical energy of the steam turbine apparatus ( 106 ) can be fed. Storage device ( 142 ) according to claim 16, characterized in that the loading device ( 148 ) a heat pump device ( 152 ).

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