WO2019228809A1

WO2019228809A1 - Power plant facility having electrolyser and fuel synthesis

Info

Publication number: WO2019228809A1
Application number: PCT/EP2019/062459
Authority: WO
Inventors: Thomas ACHTER
Original assignee: Siemens Aktiengesellschaft
Priority date: 2018-05-30
Filing date: 2019-05-15
Publication date: 2019-12-05

Abstract

The invention relates to a power plant (1), which is used to generate electrical and/or thermal energy to be fed into an electrical grid (11) and/or district heating grid (E). The power plant facility comprises: a combustion facility (2) for the combustion of a carbonaceous fuel, as a result of which a CO2-containing waste gas (3) is created; a separation device (4) downstream of the combustion facility (2) for separating CO2 from the waste gas; an electrolyser (5) for producing hydrogen (12) and oxygen (13) from water; and a synthesis device (6) for the synthesis of a synthetic fuel (14) from the separated CO2 and the hydrogen (12) produced in the electrolyser (5). According to the invention, a control device (R) is provided, by which the electrical power consumption of the electrolyser (5) can be controlled according to an electrical power demand of the electrical grid (11), a demand for grid frequency control and/or a power demand of the district heating grid (E).

Description

description

Power plant with electrolyzer and fuel synthesis

Power plants, which are supplied with fossil or biological fuel and emit C02 (hereinafter referred to as thermal power plants), are increasingly under political and legal pressure, emissions

To reduce carbon dioxide (C02). This applies in particular to fossil-fueled thermal power plants. Various technologies are available for the separation of CO 2 from the flue gas of a fossil-fueled power plant. C02 example, can be almost completely separated from the flue gas in a separator by a wet-chemical scrubbing with an absorbent (C02Capture). Such deposition devices, however, are very large and complex due to the high volume flow of the flue gas to be cleaned.

There are several reasons why such

Deposition devices for the separation of CO 2 from power plant exhaust gases have not enforced. On the one hand, the separation is very energy-consuming, so that a separation often does not pay off alone for economic reasons. On the other hand, the question of the further utilization or storage of CO 2 is still not universally clarified, which is why CO 2 separation is often due to a lack of CO 2 separation

Acceptance in the population.

Thermal power plants are preferably under near

Full-load operated and provide network services in the connected to this power grids. frequency

services include, for example, fast increases or decreases in power frequency drop or increase or voltage regulation. Under full load, the power plants achieve their highest efficiency with minimum specific emission of harmful carbon dioxide. Are larger proportions of regenerative energy producers, such as in the same power grid

Photovoltaic or wind turbines, the thermal power plants need the volatile power of the volatile

compensate for regenerative energy producers. This can result in the thermal power plants having to be operated in inefficient partial load conditions, where higher specific CO 2 emissions also occur. In addition, heat is partially decoupled from thermal power plants, which are used for heating purposes of apartments or industrial plants or as process steam in industry for certain

thermal processes is needed. This requires that a thermal power plant is run in a heat-controlled manner, which limits the ability to provide network services.

In addition, if there is a power overproduction by the volatile regenerative power generators, the

Thermal power plants are shut down in power or even taken off the grid, resulting in a significant

Lifetime consumption of the thermal power plants, additional emissions during startup and shutdown and startup costs possibly with expensive secondary fuels. For example, to start up a coal-fired power station expensive oil is often used to start the power plant.

However, it may also be that, for reasons of network technology, a thermal power plant is not run down but is operated at minimum load, although there is too much electrical power in the grid. The reasons for this can be predicted sinking

Power production of solar power plants (sunset) or waning wind in wind turbines. In such a case, due to grid bottlenecks, the wind turbines and / or solar panels are switched off.

For temporary storage of excess electrical energy in the power grid, various systems are already used. For example, are known Battery systems that are very expensive and can store only a limited amount of energy. Batteries can however with high requirements at the

Control speed brings advantages.

In order to maintain a stable grid frequency, especially thermal power plants take over the function of the frequency control in the power grid by a positive and negative primary,

Secondary and tertiary control. By rotating masses in the power plants power reserves in the form of coupled in synchronous frequency inertia for the primary control can be provided in the millisecond range. For the

Secondary control power reserves are available, for example, by throttled steam valves, additional boiler firing or gas turbine overfire, which can be provided in the second to minute range. Within 10-20 minutes there are more for tertiary control

Powerhouse blocks in standby, which can be started up at short notice and connected to the grid. The controllability of thermal

Power plants requires that even with excess electricity

thermal power plants are operated on the grid and

must be turned off regenerative sources that do not meet this condition.

The object of the invention is to provide a device and a

Specify a method by which a common,

efficient and economical operation of thermal power plants can be improved together with renewable energy generators in the same power grid of the kind that a higher grid stability exists. It is another object of the invention to avoid or reduce shutdown of volatile regenerative energy sources due to network congestion, so that harmful C02 emissions are reduced in the overall balance, and extends the life of thermal power plants and the

Economic efficiency of thermal power plants can be improved. The object of the invention directed to a device is solved by a power plant of independent claim 1.

The power plant according to the invention according to claim 1 is used to generate electrical and / or thermal energy for

Infeed into a power and / or district heating network. It includes an incinerator for the combustion of a

Carbonaceous fuel, whereby a C02-containing exhaust gas is produced, a separation device connected downstream of the incinerator for separating CO 2 from the exhaust gas, an electrolyzer for generating hydrogen H 2 and oxygen 0 from water, a synthesis device for

Synthesis of a synthetic fuel from the separated CO 2 and the hydrogen produced in the electrolyzer H2.

According to the invention, a control device is provided by which the electrical power consumption of the electrolyzer in dependence on

an electrical power requirement of the power grid, a request of the grid frequency control and / or a power requirement of the district heating network

is controllable.

The invention is based on the consideration that by the electrolyzer an additional adjustable or adjustable load (electrical load) is connected to the power grid, through which the power grid can be stabilized by

Power fluctuations are compensated by regenerative energy producers. The electrolyzer is used according to the invention for frequency support. The invention recognizes that this is possible because an electrolyzer can provide load gradients of about 10% per second, and thus also for

Frequency support of the primary control can be used. The

The invention combines a CO 2 separation device, an electrolyzer and a synthesis device of the type

with each other, that is an efficient and more frequency secure

Operation of renewable energy producers and thermal power plants is made possible. The removal of C02 from the flue gas significantly reduces the harmful emissions. The problem of storing / using the separated CO2 is eliminated by converting the CO2 into methanol or other synthetic fuels (e-fuels) which can be re-used for the chemical industry or as a fuel, thereby limiting the use of other basic materials such as carbon dioxide Reduce oil and natural gas. Also can be dispensed with other storage solutions, such as expensive and capacity-limited battery systems as a sole solution.

A significant advantage of the invention is that the fossil-fired power plant no longer has to be shut down and taken off the grid, since even if the power plant does not have to feed power into the public grid, a minimum power for the electrolyser must be provided. The minimum load of the power plant corresponds to the maximum power consumption of the electrolyzer in this operation. By avoiding unnecessary shutdowns, the lifetime consumption of

Power plants minimized what maintenance intervals

extended and thus costs reduced. Even cost-intensive and inefficient starting processes of the power plant are reduced. Also avoided is the shutdown of

Regenerative power generation plants due to

Network bottlenecks.

Furthermore, by integrating the electrolyzer in the power plant, the thermal power plant can be operated more often under full load, and thus efficient, and emitting lower emissions than under partial load. Since the thermal power plants are relieved by the invention and in particular of mains frequency control measures, operation is better under and thermal

more efficient conditions possible. If the secondary

control measures completely taken over by the electrolyser can also be the technical complexity of a

thermal power plant to be reduced.

The C02 can either partially or almost completely from the flue gas of the power plant by the

Deposition device are deposited. As a result, the thermal power plant can contribute to the politically desired reduction of the C02 footprint. A complete shutdown of fossil fueled power plants is not foreseeable for lack of storage capacity in the near future and the continued operation of these systems in low load without active power to the network with full power frequency control capability coupled coupled rotating mass offers great benefits for the network. This will lead to a significant increase in public acceptance, so that thermal power plants will also be seen as a reliable and necessary component of the energy mix. Existing thermal power plants can thus continue to be operated by retrofitting and to rebuild the central power supply in the direction of a C02 neutral

Contribute to power supply.

The separated CO 2 is in the connected synthesis, or other suitable device, together with the

Hydrogen from the electrolyzer is processed to high purity methanol or other e-fuel. To generate additional revenue, the methanol or other e-fuel is sold as a product by the operator of the power plant. Methanol e.g. is in demand by the chemical industry. Even fossil fuels can be replaced or

which would reduce dependency on oil and gas imports.

Even if the synthesized methanol is burned again and the CO 2 bound therein is released, there is one

improved global carbon footprint, as fossil-fueled power plants are now more efficient and have lower emissions

can be operated or because of network bottlenecks no or less surplus power of wind and sun must be discarded and by the use of the

Methanol or other e-fuels other fossil fuels are subsumed.

By the invention can be especially regenerative

Operate energy producers and thermal power plants better in the common power grid and the flexibility

increase. This is particularly important in view of the expected expansion of the proportion of volatile regenerative energy producers. This is possible on the one hand by the fact that thermal power plants, and thus the rotating masses, even in excess electricity

regenerative energy generator for frequency support can be kept coupled to the network.

The power plant, which serves as C02 source, can also be a cogeneration plant.

In a further development of the invention, the

Power plant continues to use a battery for a

Storage capacity is designed in seconds, and which is located between power grid and electrolyzer. The battery additionally supports a requirement for the mains frequency control. The battery may also serve to maintain a black start capability, rebuild a possible network crash, and provide very fast grid control requirements of less than one second. The battery can

Be part of a battery storage system. The battery is in particular an improvement of

Control possibilities in the range <1 second achieved.

Preferably, the synthetic fuel is methanol. But it is also possible to produce other fuels, such as synthetic diesel or kerosene.

In a particular further development of the invention, the power plant further comprises a turbo set with a Turbine and a generator, which are arranged on a common shaft, and a coupling, which is arranged in the shaft between turbine and generator. Through the coupling of the generator of the turbine can be decoupled. By the

Decoupling allows the generator to remain connected to the mains, even when the turbine is off. Due to the electrical connection to the network, a rotating mass is held in the network, which also serves as a frequency support.

In a further embodiment of the power plant, the electrolyzer is followed by a compressor and a storage, so that hydrogen produced is compressed and temporarily stored. Likewise, in a further embodiment of the

Power plant provided that the separator a compressor and a memory are connected downstream, so that separated C02 is compressed and cacheable.

Caching provides additional flexibility in the operation of the power plant.

In a further development of the power plant, is

Furthermore, a connecting line is provided which the

Electrolyzer connects with the combustion device, so that produced in the electrolyzer oxygen in the

Combustion device is conductive. The Verbrennungsvor direction is the combustion chamber of a gas turbine. By using the generated oxygen, which is largely pure, the combustion can be made cleaner and the gas turbine can be operated more efficiently, since less inert gas must be transported through the gas turbine. Because less or no nitrogen is passed through the gas turbine, which heats up strongly as a result of the combustion, the loss of hot exhaust gas through the chimney can be reduced.

The object of the invention directed to a method is solved by the features of independent claim 8. In the inventive method for operating a

Power plant for generating electrical and / or

thermal energy for feeding into a power and / or district heating network, is in a combustion process

burned carbonaceous fuel, wherein a C02-containing exhaust gas is formed in a C02 deposition process downstream of the combustion process, C02 separated from the exhaust gas, in an electrolysis process hydrogen and oxygen separated from water, and in a synthesis process from the C02 from the deposition process and the generated

Hydrogen from the electrolysis process produces a synthetic fuel. According to the invention by a

Regulating process the electrical power consumption of the

Electrolysis process depending on

an electrical power requirement of the power grid, a request of the grid frequency control, and / or a power requirement of the district heating network

regulated, so by the electrolysis process as

additional adjustable or adjustable load the power grid

is stabilized.

The advantages of the method according to the invention are analogous to the advantages of the device according to the invention.

In an advantageous further development, a battery is further provided for storage capacity in the

Seconds is arranged, and which is arranged between power grid and electrolyzer, so that a requirement for the grid frequency control is additionally supported.

Preferably, methanol is produced as a synthetic fuel.

In a further advantageous embodiment of the

According to the invention, a turbine set with a turbine and a generator is further provided, which are arranged on a common shaft, wherein by a coupling in the shaft between turbine and generator the generator is decoupled from the turbine.

In an advantageous embodiment of the method, the electrolyzer downstream of a compressor and a memory, so that generated hydrogen compressed and

is cached. Likewise, it is advantageous the

Separator device a compressor and a storage

downstream so that separated C02 is compressed and cached.

In a preferred embodiment of the invention

Method, the generated in the electrolyzer oxygen of the combustion device via a connecting line which connects the electrolyzer with the combustion device supplied.

Embodiments of the invention are described below with reference to figures. It shows:

1 shows a power plant according to the invention with a thermal power plant, a C02

Deposition apparatus, an electrolyzer and a synthesizer.

Figure 2 is a further development of the invention

Power plant.

FIG. 3 shows diagrams for illustrating cases of

Operating modes of the control device R.

Figure 1 shows the power plant 1 according to the invention, comprising a combustion process 2, in which a

carbon-containing fuel is supplied, and in which a CO 2 -containing exhaust gas 3 is formed, a CO 2 separation device 4 for separating CO 2 from the exhaust gas 3, an electrolyzer 5 for generating hydrogen 12 and

Oxygen 13 from air, and a synthesizer 6. The Synthesizer 6 is a device for e-fuel

Preparation, such as methanol 14 or methane.

The CO 2 -containing exhaust gas 3 is supplied to the CO 2 precipitation device 4. The CO 2 separation device 4 leaves a partially or largely exempt from C02 exhaust gas 7, as well as separated CO 2 8. The power plant 1 is connected to the

Power transmission network 11 connected. In addition, regenerative power generators are connected to the power transmission network 11, e.g. Wind turbines 19 and photovoltaic power plants 20. The electric power transmission network 11 has limited transmission capacity C, which results in excess power over production that wind or solar energy must be discarded.

By combustion of a carbonaceous fuel in the combustion process 2, a heat engine 9 is driven, which in turn drives a generator 10 Stromer generation. The combustion process 2 may be a fired boiler that generates steam that is expanded in a steam turbine. The Ver

combustion process 2 may also be the combustion chamber of a gas turbine, wherein the fuel gas is expanded in the expansion part of the gas turbine. The combustion process 2 can also be

Piston engine be burned in the fuel in cylinders. The components combustion process 2,

Heat engine 9 and generator 10 form a

conventional thermal power plant D which with

Carbon-containing fuel is operated. Optionally, heat E, e.g. in the form of steam from the thermal power plant D and sold as a product (e.g., district heating or process steam).

The generator 10 is connected to the power grid 11. Also connected to the mains 11 is the electrolyzer 5, which is powered by electricity. The electrolyzer 5 generates

Hydrogen 12 and oxygen 13. The hydrogen 12 from the electrolyzer 5 is taken together with the CO 2 8 from the Deposition device 4 passed into the synthesis device or other device for e-fuel production 6. In the synthesis device or other device for e-fuel production 6, for example, methanol 14 is generated from hydrogen 12 and CO 2 8.

The electrolyzer 5 is controlled by a control device R, which determines the electrical power consumption of

Electrolyzer 5 depending on one or more parameters controls.

A first parameter is the electrical power requirement of the power network 11. By the control device R, the electrolyzer 5 is dependent on the power grid

to be provided power or regulated so that the electrolyzer 5 as electrical load more or less

Power from the power grid 11 pulls. This will

excess power in the power grid 11, which

for example, by the regenerative energy sources

is introduced, received by the electrolyzer 5.

As a result, the thermal power plant D does not have to be throttled in the line.

A second parameter is the requirement of

Power frequency control. Again, by the

Regulating device R of the electrolyzer 5 as a function of the mains frequency increased or decreased, so that the

Electrolyzer 5 as an electrical load more or less

Power from the power grid 11 pulls. As a result, a support of the mains frequency is possible. It is advantageous that the generator of the thermal power plant D can remain on the power grid 11, and thus additionally supports the network frequency as a rotating mass.

A third parameter is the power requirement of the optional existing district heating network. In this case, the control device R controls the electrolyzer 5 depending on the amount of energy or steam taken, so that despite a possible, fluctuating energy extraction, the thermal power plant D can be operated at a constant power.

The control device R can take into account one of these parameters. It makes sense, however, all parameters are taken into account, which on the driving style of the thermal

Power plant D have influence. The aim of the control is always to allow a constant as possible operation of the thermal power plant D.

Figure 2 shows a further development of the power plant according to the invention of Figure 1. This includes as well as Figure 1 a combustion process 2, a CO 2 separation device 4, an electrolyzer 5 and a

Synthesizer 6. The synthesizer 6 in which the synthetic fuel is produced is a means for producing methanol 14.

In the further development of Figure 2 is still a

Battery B is provided, which is designed for a storage capacity in the second range. The battery B is disposed between the power grid 11 and 5 electrolyzer. By the

Battery B can thus make a request to the

Grid frequency control can be additionally supported.

The battery is preferably located in

partially charged state. By charging the battery B via the mains 11 becomes negative, and by discharging positive

Provide control energy. The power plant D is no longer subjected to strong load fluctuations by avoiding strong temperature fluctuations

has life-prolonging effect. So is by the

Electrolyzer in conjunction with the battery ensures full positive and negative controllability.

Figure 2 shows a further embodiment of the invention with a coupling A in the shaft between turbine 9 and Generator 10, which together form a turbo set. Through the coupling of the generator of the turbine can be decoupled.

FIG. 2 also shows an embodiment in which

Electrolyzer 5 a compressor 17 and a hydrogen storage 18 are connected downstream. Furthermore, the C02

Separator 4 downstream of a compressor 15 and a C02 memory 16 so that separated C02 is compressed and cacheable. The compressors 15, 17 may be operated by an electric motor. The compression of C02 and H2 can occur depending on the process requirements. The design of the memory 16, 18 is to vote on the expected operating regime of the power plant 1 with respect to flow, heat or methanol or e-fuel guided driving style.

Furthermore, a connecting line is provided, which connects the electrolyzer 5 with the combustion device 2, so that in the electrolyzer 5 generated oxygen 13 can be conducted into the combustion device 2.

All embodiments shown in Figure 2 are preferably realized in an advantageous embodiment of the power plant.

Figure 3 shows a diagram I) to IV) by the cases of operations of the control device R to be illustrated. In the graphs, power P is plotted in percent% over time t. The lines show the behavior of the power, measured at different points in the power grid 11.

Diagram I:

31 is the power measured in the power grid after the

Infeed through the power plant. The power 31 is equal to the amount of electricity requested by the power grid 11. In this example, the performance 31 is the one demanded

Current amount constant. 32 is the power that are introduced by the regenerative energy generator 21 in the power grid. In this example, the power 32 introduced by the regenerative power sources 21 constantly increases to exceed 100% of the requested power 31, resulting in a power surplus in the power grid (11).

33 is the power that is fed by the power plant 1 into the power grid 11. The power plant 1 must compensate for the power 32 introduced by the regenerative energy sources 21, so that the power introduced in the power grid is equal to the demanded amount of electricity.

The power 33 is the output power of the power plant 1 and is composed of the power 35 of the generator 10, the power 34 of the electrolyzer 5 and the power 36 of the batteries B.

Chart II)

35 is the power introduced into the grid by the generator 10. The generator 10 of the thermal

Kraftwerkes D becomes with the usual in its expression Stellstellgeschwindigkeit the controlled variable power output in

Seconds to minutes range and used for voltage regulation.

Chart III)

34 is the power supplied to the grid

Electrolyser 5. The electrolyser absorbs active power in the range of seconds, e.g. 10 seconds

regulated. In this example, the electrolyser operates at full load with a negative power of 20%.

IV)

36 is the power supplied by the battery B in the power grid. The manipulated variable becomes the battery Active power input and output, as well as the voltage, regulated in the millisecond range.

The control device R regulates the parameters voltage and active power to generator 10, electrolyzer 5 and battery B so that they to the setpoint at the connection of

Power plant to meet the grid and the

Power plant fully controllable remains.

Power surplus in the network using the example of diagram I):

At time 0, the proportion of power 32 introduced into the grid by regenerative energy sources 21 is about 20% and the fraction of power 33 introduced by the fossil-fired power plant is about 80%. In this operating state of the fossil-fired power plant, the power plant runs at full load. The power consumption of the electrolyzer 5 is controlled in this case by the control device to 20%.

At time 1, the share of imported power in the electricity grid by renewable energy sources has risen to 100%. Without the control device R would have

fossil-fueled power plant down to 0%, or have to be taken off the grid. The regulating device R regulates

According to the invention, however, and increases the power consumption of the electrolyzer, so that the fossil-fired

Power plant must not be taken off the grid, but can be operated with a cheap primary fuel in minimum load at, for example, 20%. The whole

generated electric power 35 is received by the electrolyzer. The electrolyzer is designed at least for this load case. That is, the maximum

Load capacity 34 of the electrolyzer corresponds to at least the minimum load in which the fossil-fired power plant can be operated on the grid.

As a result, the power grid limited in capacity is not burdened and made possible by the amount of electricity from the power plant so that shutdowns of renewable sources such as wind and photovoltaic are avoided or largely reduced.

Because of the power plant with the power grid

remain connected, the full control ability is maintained. The controllability of positive active power, negative active power, frequency (cos cp) and voltage consists of:

The synchronously rotating mass inertia (generator and

Prime mover)

Short nominal load jumps (<ls) by means of optional battery

Positive load jumps (~ 10s) by relieving the

Electrolysers or shutdown of the heat engine (while the generator is decoupled mechanically via the clutch A remains electrically synchronously coupled to the mains and supports it by its inertia and voltage or power factor control.

The aforementioned measures 2 and 3 can be combined and run slower in time. Thus, the primary, secondary and tertiary control of the power plant is also available when no active power is supplied to the power grid or even power is absorbed.

Such a procedure reduces the number of starts of the power plant to a minimum, which reduces its lifetime consumption, starting costs with expensive secondary fuel

avoids and reduces start-up emissions.

For electricity prices that allow an economical operation of the fossil-fired power plant, and none

Restrictions of the power grid with regard to active power, the power plant is operated in partial to full load operation with primary fuel.

The control device according to the invention controls the

Depending on the conditions on the electrolyser Reserve energy market, heat and e-fuel market in

Partial load operation.

For example, the operation of the electrolyzer at half load allows an active power jump of the power plant by 50% of the electrolysis power in the positive direction by relieve or allow in the negative direction by loading.

For the operator of the power plant there is a

Optimization option between electricity, e-fuel,

Control energy and heat revenues. Especially with heat-controlled thermal power plants, the feed of electricity and heat generation is decoupled resulting in operational and

marketing properties of the plant.

By the invention, the life of the

fossil-fueled power plant by avoiding steep temperature gradients for new and old plants

extend. In addition, an optimization between electricity, e-fuel, control energy and heat revenues is made possible. Furthermore, a network stabilizing operation of the power plant is possible without delivery or even with the inclusion of active power with complete preservation of the voltage or frequency control with a corresponding discharge of the transmission networks. Thus, the shutdown of volatile regenerative

Generators such as wind and solar power plants are avoided. Finally, by the invention of C02 emissions in the overall balance of volatile regenerative

Generators, power plant and methanol / e-fuel

Economy diminished.

Claims

claims

1. Power plant (1) for generating electrical and / or thermal energy for feeding into a power (11) and / or district heating network (E), comprising an incinerator

(2) for the combustion of a carbonaceous substance

Fuel, whereby a CO 2 -containing exhaust gas (3) is formed, one of the incinerator (2) downstream

Separating device (4) for separating CO 2 from the exhaust gas

(3), an electrolyzer (5) for generating hydrogen

(12) and oxygen (13) from water, a synthesizing device (6) for synthesizing a synthetic fuel (14) from the separated CO 2 (8) and that produced in the electrolyzer (5)

Hydrogen (12),

characterized in that a control device (R) is provided, through which the electrical

Power consumption of the electrolyzer (5) in response to an electrical power requirement of the power grid (11), a requirement of the grid frequency control and / or a power requirement of the district heating network (E) is controllable, so by the electrolyzer (5) as an additional adjustable or adjustable load the power grid (11) is stabilized.

2. Power plant (1) according to claim 1, further

comprising a battery (B), which is designed for a storage capacity in the second range, and which is arranged between the power grid (11) and electrolyzer (5), so that a

Requirement for the mains frequency control in addition

is supported.

3. Power plant (11) according to claim 1 or 2, wherein the synthetic fuel (14) is methanol.

4. Power plant (1) according to one of claims 1 to 3, further comprising a turbine set with a turbine (9) and a generator (10) mounted on a common shaft

are arranged, characterized in that a coupling (A) in the shaft between turbine (9) and generator (10) is arranged, through which the generator (10) of the turbine (9) can be decoupled.

5. Power plant (1) according to one of claims 1 to 4, characterized in that the electrolyzer (5) a

Compressor (17) and a memory (18) are connected downstream, so that generated hydrogen (12) compressed and

is temporarily storable.

6. power plant (1) according to one of claims 1 to 5, characterized in that the separating device (4) a compressor (15) and a memory (16) are connected downstream, so that separated C02 (8) compacted and

is cacheable.

7. Power plant according to one of claims 1 to 6, characterized in that further comprises a

Connecting line is provided which connects the electrolyzer (5) with the combustion device (2), so that in the electrolyzer (5) generated oxygen (13) in the

Combustion device is conductive.

8. A method for operating a power plant (1) for generating electrical and / or thermal energy for

Infeed into a power (11) and / or district heating network (E), in which in a combustion process (2) a

combusting carbonaceous fuel to produce a CO 2 -containing exhaust gas (3) in a CO 2 precipitation process (4) downstream of the combustion process (2),

C02 (8) is separated from the exhaust gas, in one

Electrolysis process (5) hydrogen (12) and oxygen (13) are separated from water, and in a synthesis process (6) from the CO 2 (8) from the deposition process (4) and the

produced hydrogen (12) from the electrolysis process (5) a synthetic fuel (14) is generated, wherein by a control process (R), the electrical power consumption of the

Electrolysis process (5) as a function of a

electric power requirement (11), one Requirement of network frequency control, and / or one

Power requirement of the district heating network (E) adjustable

is regulated, so that the power grid (11) is stabilized by the electrolysis process (5) as an additional adjustable or adjustable load.

9. The method of claim 8, further comprising a battery (B) provided for storage capacity in the

Seconds is designed, and between the power grid (11) and electrolyzer (5) is arranged so that a

Requirement for the mains frequency control in addition

is supported.

10. The method according to claim 8 or 9, wherein as

Synthetic fuel (14) methanol is produced.

11. The method of claim 8 to 10, further comprising a turbine set with a turbine (9) and a generator (10) which are arranged on a common shaft, wherein, by a coupling (A) in the shaft between turbine ( 9) and generator (10) of the generator (10) from the turbine (9) is decoupled.

12. The method according to claim 8 to 11, wherein the

Electrolyzer (5) a compressor (17) and a memory (18) are connected downstream, so that generated hydrogen (12) is compressed and cached.

13. The method of claim 8 to 12, wherein the

Separator (4) a compressor (15) and a memory (16) are connected downstream, so that separated C02 (8) is compressed and cached.

14. The method of claim 8 to 11, wherein the

Combustion device (2) via a connecting line which connects the electrolyzer (5) with the combustion device (2), in the electrolyzer (5) generated oxygen (13) is supplied.