US20190264579A1 - Thermal power station - Google Patents
Thermal power station Download PDFInfo
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- US20190264579A1 US20190264579A1 US16/308,419 US201716308419A US2019264579A1 US 20190264579 A1 US20190264579 A1 US 20190264579A1 US 201716308419 A US201716308419 A US 201716308419A US 2019264579 A1 US2019264579 A1 US 2019264579A1
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- Prior art keywords
- heat exchanger
- air
- container
- heat
- water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/006—Accumulators and steam compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/12—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having two or more accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
- F01K3/186—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters using electric heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
Definitions
- the invention relates to a thermal power station having a steam generator, which comprises a combustion chamber with a feed for combustion air, having a water-steam cycle, which is connected to the steam generator, and having a thermal store, which is connected to the water-steam cycle.
- the invention also relates to a method for storing heat in a thermal power station which comprises a steam generator with a combustion chamber and a feed for combustion air and water-steam cycle.
- thermal energy can be decoupled as required from the water-steam cycle of the power station directly or via a heat exchanger into a thermal store.
- the steam therefore does not necessarily have to be conducted via the turbine set or turbo set for electricity generation, but alternatively can be guided into the thermal store in order to deliver thermal energy.
- the amount of steam used for electricity generation can be reduced and therefore the amount of electricity fed from the power station into the grid can be controlled as required. If the power station then has to be started up again, the heat stored in the thermal store can be decoupled into the steam generator.
- the thermal store can consist of two containers operated in alternation and containing a store medium, for example melted salt.
- the thermal store is thermally coupled to a second heat exchanger which is in turn coupled thermally to a second steam generator.
- a turbine set or turbo set with connected generator is associated with the second steam generator.
- the second heat exchanger is preferably operated if undercapacities in the electricity grid are to be compensated.
- the thermal store can be connected to an air preheating device for preheating combustion air.
- no practicable solution was described regarding how the decoupling of the thermal energy stored in the thermal store via the air preheating device could function.
- WO 2013/014664 A2 discloses another kind of hybrid power station, which mixes thermal energy from different energy sources, stores it and provides it for a generator.
- WO 2014/076849 A1 discloses another kind of device for providing thermal energy for a generator, wherein energy is conducted directly to the generator via a heat carrier fluid cycle and thermal energy is fed to a storage tank via a separate, second heat carrier fluid cycle which thermal energy is conducted to the generator as required.
- EP 2 562 373 A1 presents an IGCC (integrated gasification combined cycle) process, in which some of the thermal energy of the synthesis gas created by said process is converted into electrical energy via a Rankine cycle.
- IGCC integrated gasification combined cycle
- WO 2014/044549 A2 furthermore discloses a different kind of method for charging and discharging a thermal store, in which the corresponding cycles are designed as a Rankine cycle.
- heat is transferred from a gaseous working fluid via a first heat exchanger to a liquid storage medium of the thermal store.
- the object of the present invention is therefore that of creating a thermal power station of the kind mentioned in the introduction of simple design, in which the thermal energy stored in the thermal store can be fed back as efficiently as possible.
- thermal power station having the features of claim 1 and a method for storing heat in a thermal power station having the features of claim 11 .
- the thermal store comprises a first container for a heat store medium when it is cold, a second container for the heat store medium when it is hot, and a heat exchanger which is connected to the first container and to the second container, wherein the heat exchanger is connected to the water-steam cycle via a water-steam feed line and a water-steam discharge line, wherein the heat store medium can be conveyed from the first container via the heat exchanger to the second container in order to absorb heat from the water and steam, wherein the thermal store comprises an additional heat exchanger which is connected to the first container and to the second container, wherein an air feed line for feeding air into the additional heat exchanger and an air discharge line for discharging the air from the additional heat exchanger are provided, wherein the heat store medium can be conveyed from the second container via the additional heat exchanger to the first container in order to dissipate heat to the air, wherein the air discharge line is connected to the feed for combustion air into the combustion chamber.
- the heat store medium When charging the thermal store, the heat store medium is guided from the first container via the heat exchanger into the second container, wherein the heat store medium is heated by absorbing heat from the water and steam.
- the water and steam is preferably branched from the water-steam cycle between the steam generator and the turbine.
- the heat store medium When charging the thermal store the heat store medium itself is advantageously moved, whereby the heat exchange can be particularly efficient.
- discharging the thermal store the heat store medium is conveyed in the opposite direction from the second container via an additional heat exchanger to the first container. During this process, an airflow is guided through the additional heat exchanger, at which the heat store medium outputs its heat. The heat store medium is thus cooled, and the airflow is heated accordingly. The airflow is then fed to the feed into the combustion chamber of the steam generator, such that the thermal energy stored in the thermal store is in turn available for the steam generation. Interventions involving the complex water-steam cycle of the thermal power station can thus be minimised advantageously.
- the steam generator can have a wide range of different embodiments, however these have long been known in the prior art and therefore do not require any further explanations.
- the steam generator can therefore comprise in particular an evaporator, a superheater, a feed water preheater, an air preheater, and a furnace, for example for coal, oil, biomass or gas. It is in any case essential that the charging of the thermal store in the heat exchanger occurs by means of water and steam, and the discharging of the thermal store in the additional heat exchanger occurs by means of air.
- the heat exchanger and the additional heat exchanger are structurally separate from one another here.
- the heat exchanger and the additional heat exchanger can thus be adapted selectively to the different requirements of the charging process and discharging process and also to the various types of heat carrier media (water and steam in the case of the heat exchanger, air in the case of the additional heat exchanger). Since air has a much lower heat transfer coefficient than water and steam, the required heat exchange surfaces in the additional heat exchanger are much greater than in the heat exchanger with identical heat flow and identical temperature difference. By using separate heat exchangers, these differences can be easily taken into account.
- the cross-section of the line arrangement in the additional heat exchanger can thus be much greater than the cross-section of the line arrangement in the heat exchanger.
- a first shut-off device is provided between the first container and the heat exchanger and/or a second shut-off device is provided between the first container and the additional heat exchanger and/or a third shut-off device is provided between the second container and the heat exchanger and/or a fourth shut-off device is provided between the second container and the additional heat exchanger.
- the aforesaid shut-off devices can be switched between an open position enabling the passage of the heat store medium and a blocking position blocking the passage of the heat store medium.
- the first shut-off device and the third shut-off device in the charging state of the thermal store are arranged in the open position, such that the heat store medium can flow from the first container via the heat exchanger to the second container.
- At least the second shut-off device in particular also the fourth shut-off device, is arranged in the closed position in the charging state of the thermal store, such that the heat store medium cannot pass from the first container into the heat exchanger.
- the switched positions of the shut-off devices can be reversed.
- at least the third shut-off device, in particular also the first shut-off device, in the charging state of the thermal store can be arranged in the closed position, such that the heat store medium cannot pass from the second container into the heat exchanger.
- the fourth shut-off device and the second shut-off device are arranged in the open position in the discharging state of the thermal store, such that the heat store medium can flow from the second container via the additional heat exchanger into the first container.
- Solid particles in particular sand or corundum, are preferably arranged as heat store medium in the first and/or second container.
- This embodiment in particular is associated with the advantage that these heat store media can be used at much higher temperatures. These materials also have particularly high long-term stability and can be acquired economically.
- the additional heat exchanger is designed for discharging the thermal store for a direct heat exchange between the solid particles and the air.
- the surfaces of the solid particles advantageously form large heat exchange surfaces which enable an effective dissipation of heat to the air.
- the heat exchanger for charging the thermal store is preferably designed for indirect heat transfer between the heat store medium and the water and steam, for example by means of a line arrangement.
- a fluidised bed heat exchanger is provided each as heat exchanger and/or as additional heat exchanger.
- the air required for the fluidisation of the heat store medium in the additional heat exchanger can additionally be used as heat carrier medium for the withdrawal of thermal energy.
- the low heat transfer coefficient of air can advantageously be compensated by the very large heat exchanger surfaces in the fluidised layer.
- the volume flow of the air in the additional heat exchanger during discharging can be much higher than the volume flow of a fluidisation air of the heat exchanger during charging of the thermal store.
- a direct heat exchange can take place between the air and the heat store medium.
- an indirect heat exchange preferably can be provided between the water and steam and the heat store medium in the heat exchanger for charging the thermal store.
- the water-steam feed line and the water-steam discharge line can be connected within the heat exchanger by a line arrangement, in particular by a tube bundle.
- the line arrangement comprises heat exchange surfaces for heat exchange between the heat store medium and the water and steam.
- an air preheater for preheating the combustion air is preferably provided for the combustion chamber.
- the air preheater can be connected on the one hand to a fresh air inlet and on the other hand to an output line for waste combustion gases leading away from the combustion chamber of the steam generator, such that the combustion air flowing from the fresh air inlet into the air preheater is preheated by heat exchange with the waste combustion gases before the combustion air enters the combustion chamber.
- the air feed for the additional heat exchanger is branched from a connection line between the air preheater and the combustion chamber.
- a shut-off element is preferably provided between the air preheater and the air feed for the additional heat exchanger which shut-off element preferably is adjustable substantially continuously between an open position allowing the airflow to pass through and a closed position blocking the passage of the airflow.
- the connection line preferably comprises a further shut-off element which likewise is adjustable preferably substantially continuously between an open position and a closed position. The volume flow for the air feed into the additional heat exchanger can thus be adjusted.
- a first volume flow can be branched from the connection line via the bypass line into the air feed for the additional heat exchanger, wherein the first volume flow is designed to enable the withdrawal of the thermal energy of the heat store medium in the airflow.
- the air preheater and the air feed for the additional heat exchanger in the discharging state of the thermal store are therefore connected in series.
- a second volume flow can be branched from the connection line into a further air feed for the heat exchanger in a preferred embodiment in order to enable a fluidisation of the heat store medium in the heat exchanger.
- the second volume flow of the branched airflow can be lower than the first volume flow, since the air in the heat exchanger can be used merely for fluidisation, but not for heat absorption.
- the air preheater is connected to a fresh air inlet, wherein the air feed for the additional heat exchanger is connected to a fluidisation air inlet.
- the air feed for the additional heat exchanger is connected to a dedicated fluidisation air inlet, via which an airflow for the additional heat exchanger can be provided independently of the fresh air inlet for the air preheater.
- An adaptation to the different pressure conditions and mass flows can thus be achieved advantageously.
- the flow path between the fluidisation air inlet and the air feed for the additional heat exchanger is preferably free from an air preheater, such that air at ambient temperature can be introduced into the additional heat exchanger. This has the advantage that the temperature spread for the cooling of the heat store medium in the heat exchange with the air can be maximised.
- the fresh air inlet is connected to a fresh air fan and/or the fluidisation air inlet is connected to a fluidisation fan.
- the volume flows at the fresh air inlet and at the fluidisation air inlet can therefore advantageously be controlled independently of one another.
- an output line for discharging waste combustion gases from the combustion chamber is preferably provided, which output line comprises a line portion leading into the air preheater and a further line portion leading into a water preheater of the water-steam cycle.
- an electrical heating element in particular a resistance heater, is installed in the heat exchanger.
- the electrical heating element can be connected in particular to an electricity grid in order to use excess power to heat the heat store medium.
- the thermal power station comprises at least a first and a second operating state. In the first operating state the heat store medium, as described before, can be heated via the water and steam and cooled via the air. In the second operating state the electrical heating element is switched on in order to perform or support the heating of the heat store medium alternatively or in parallel to the absorption of heat from the water and steam, for example in order to reach an optimal operating temperature.
- the method according to the invention for storing heat of a thermal power station which comprises a steam generator with a combustion chamber and a feed for combustion air and a water-steam cycle comprises at least the following steps:
- FIG. 1 shows a block diagram of a thermal power station according to the invention, in which the thermal energy of a steam flow branched between a steam generator and a turbine is dissipated in a heat exchanger to a powdery heat store medium, wherein the stored thermal energy is fed back as required in an additional heat exchanger from the heat store medium into an airflow for a combustion chamber of the steam generator;
- FIG. 2 shows a block diagram of the essential components of the thermal power station according to FIG. 1 ;
- FIG. 3 shows a block diagram of a further thermal power station according to the invention.
- FIG. 1 schematically shows a thermal power station 1 in the form of a steam power station with a steam generator 2 which comprises a combustion chamber 3 (shown separately for the sake of clarity) with a feed 4 for combustion air and a feed 39 for fuel.
- a water-steam cycle 5 is connected to the steam generator 2 .
- the steam generator 2 is connected via a first valve 6 to a turbine 7 , to which there is connected a generator G.
- the water-steam cycle 5 additionally comprises further components provided as standard in the prior art, in particular a condenser 8 , a feedwater pump 9 and a feed water preheater 10 .
- the thermal power station 1 additionally comprises a thermal store 11 shown in a simplified manner in FIG. 1 and visible in detail in FIG. 2 for buffering thermal energy of the steam guided in the water-steam cycle 5 .
- the thermal store device 11 comprises a first container 12 for a heat store medium when it is cold, a second container 13 for the heat store medium when it is hot and a heat exchanger 14 connected to the first container 12 and to the second container 13 .
- a bed of solid particles, in particular sand, is provided as heat store medium.
- the heat exchanger 14 is connected to the water-steam cycle 5 via a water-steam feed line 15 and a water-steam discharge line 16 .
- a pump 17 visible in FIG. 1 is arranged in the water-steam discharge line 16 in order to compensate for any pressure losses.
- a valve 40 is provided in the water-steam feed line 15 .
- the heat store medium can be conveyed from the first container 12 via the heat exchanger 14 to the second container 13 in order to absorb heat from the water and steam.
- the thermal store 11 comprises an additional heat exchanger 18 , which is connected to the first container 12 and to the second container 13 .
- An air feed 19 for feeding air into the additional heat exchanger 18 and an air discharge line 20 for discharging the air once it has passed through the additional heat exchanger 18 is also provided.
- the heat store medium is conveyed from the second container 13 via the additional heat exchanger 18 to the first container 12 in order to dissipate heat to the air.
- the air discharge line 20 is connected to the feed 4 into the combustion chamber 3 , such that the air heated in the additional heat exchanger 18 in the heat exchange with the heat store medium can be introduced as combustion air into the combustion chamber 3 .
- a first shut-off device 21 is provided between the first container 12 and the heat exchanger 14
- a second shut-off device 22 is provided between the first container 12 and the additional heat exchanger 18
- a third shut-off device 23 is provided between the second container 13 and the heat exchanger 14
- a fourth shut-off device 24 is provided between the second container 13 and the additional heat exchanger 18 .
- fluidised bed heat exchangers are provided as heat exchanger 14 and as additional heat exchanger 18 .
- the heat exchanger 14 comprises a fluidisation air feed (not shown in FIG. 2 ), by means of which the bed of heat store medium can be fluidised.
- the fluidisation air is not provided as a heat carrier medium for charging the heat store medium in the heat exchanger 14 .
- the heat is dissipated to the heat store medium substantially completely by the steam fed via the water-steam feed line 15 .
- the thermal power station 1 comprises an air preheater 25 for preheating the combustion air prior to entry into the combustion chamber 3 .
- the air preheater 25 is connected via a fresh air fan 26 to a fresh air inlet 27 .
- the waste combustion gases generated in the combustion chamber 3 are delivered into an output line 28 , which is connected to the air preheater 25 .
- a heat exchange between the waste combustion gases in the output line 28 and the fresh air coming from the fresh air inlet 27 occurs in the air preheater 25 , such that the waste combustion gases are cooled and the fresh air is preheated accordingly.
- the cooled waste combustion gases can then be released into the surrounding environment.
- a bypass line 29 leads away from a connection line 30 between the air preheater 25 and the combustion chamber 3 which bypass line 29 is connected to the air feed 19 into the additional heat exchanger 18 .
- the air discharge line 20 from the additional heat exchanger 18 leads back into the connection line 30 .
- a shut-off element 31 is arranged in the bypass line 29 .
- An additional shut-off element 32 is arranged in the connection line 30 . With the aid of the shut-off element 31 and the additional shut-off element 32 , the volume flow in the bypass line 29 can be adjusted.
- a volume flow of air that is much higher as compared to a fluidisation volume flow is guided via the bypass line 29 into the additional heat exchanger 18 , so that the airflow can function as a heat carrier medium for the thermal energy stored in the heat store medium.
- An electrical heating element in the form of a resistance heater 40 is additionally visible in FIG. 2 schematically and is guided into the heat exchanger 14 .
- the resistance heater 40 is connected to a power grid in order to be able to heat the heat store medium in the heat exchanger 14 as required by conversion of electrical energy into thermal energy.
- the resistance heater 40 can be activated alternatively or additionally to the water-steam cycle 5 , for example so as to set an optimal operating temperature of the heat store medium.
- FIG. 3 shows an alternative variant which differs from the embodiment of FIG. 1 in respect of the discharging process. Merely the differences between the embodiment according to FIG. 3 and that of FIG. 1 will be discussed hereinafter.
- the air feed 19 for the additional heat exchanger 18 is connected to a fluidisation air inlet 33 separate from the fresh air inlet 27 .
- the key advantage of this embodiment lies in the possibility of being able to use fans or compressors especially adapted to the volume flows and pressures.
- the air preheater 25 can be decoupled from the higher pressure after the fluidisation air inlet 33 , which leads to a more economical embodiment of the air preheater 25 .
- the fluidisation air inlet 33 is connected in the shown embodiment to a fluidisation fan 34 .
- the output line 28 comprises a line portion 35 leading into the air preheater 25 and a further line portion 37 leading into a water preheater 36 of the water-steam cycle 5 .
- the waste combustion gases are guided via the line portion 35 to the air preheater 25 .
- the waste combustion gases are discharged into the surrounding environment.
- the discharging state the waste combustion gases are guided via the line portion 37 into the water preheater 36 of the water-steam cycle 5 .
- the waste combustion gases can thus be effectively cooled during the discharge in the switched-off state of the fresh air fan 26 .
- a shut-off valve 38 is arranged in each of the line portions 35 and 37 .
- a method having at least the following steps can therefore be carried out: conveying a heat store medium when it is cold from a first container 12 via a heat exchanger 14 to a second container 13 , and in the meantime conducting water and steam of the water-steam cycle 5 of the thermal power station 1 through the heat exchanger 14 with dissipation of heat to the heat store medium, conveying the heat store medium when it is hot from the second container 13 via the additional heat exchanger 18 into the first container 12 , and in the meantime conducting air through the additional heat exchanger with absorption of heat from the heat store medium when it is hot, and then feeding the air as combustion air into the combustion chamber 3 .
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Abstract
The invention relates to a thermal power station and a method for storing heat by means of a steam generator a water-steam cycle which is connected to the steam generator and to a thermal store. Said thermal store comprises a first container for a heat store medium when it is cold, a second container for the heat store medium when it is hot, and a heat exchanger which is connected to the two containers and which is connected to the heat-steam cycle via a water-steam feed line and a water-steam discharge line. The thermal store has an additional heat exchanger which is connected to the two containers, an air feed line and an air discharge line being provided, the air discharge line being connected to the combustion air feed line leading to the combustion chamber.
Description
- The invention relates to a thermal power station having a steam generator, which comprises a combustion chamber with a feed for combustion air, having a water-steam cycle, which is connected to the steam generator, and having a thermal store, which is connected to the water-steam cycle.
- The invention also relates to a method for storing heat in a thermal power station which comprises a steam generator with a combustion chamber and a feed for combustion air and water-steam cycle.
- Due to the ongoing development of renewable energies, both overcapacities and undercapacities of the electrical power can occur over the course of time. The fluctuations are compensated for with the aid of conventional power stations. For this purpose, fossil-fired power stations, in particular coal-fired power stations, with steam generators are often used, however these are associated with the disadvantage that the amount of power to be delivered to the power grid cannot be altered arbitrarily or sufficiently quickly.
- For this reason, a generic thermal power station has already been proposed in
DE 10 2012 103 617 A1, with which an adaptation to the fluctuating feed-in demand of the connected electricity grid is made possible. For this purpose, thermal energy can be decoupled as required from the water-steam cycle of the power station directly or via a heat exchanger into a thermal store. The steam therefore does not necessarily have to be conducted via the turbine set or turbo set for electricity generation, but alternatively can be guided into the thermal store in order to deliver thermal energy. With constant steam generation, the amount of steam used for electricity generation can be reduced and therefore the amount of electricity fed from the power station into the grid can be controlled as required. If the power station then has to be started up again, the heat stored in the thermal store can be decoupled into the steam generator. The thermal store can consist of two containers operated in alternation and containing a store medium, for example melted salt. In one embodiment the thermal store is thermally coupled to a second heat exchanger which is in turn coupled thermally to a second steam generator. A turbine set or turbo set with connected generator is associated with the second steam generator. The second heat exchanger is preferably operated if undercapacities in the electricity grid are to be compensated. Furthermore, it was mentioned generally inDE 10 2012 103 617 A1 that the thermal store can be connected to an air preheating device for preheating combustion air. However, no practicable solution was described regarding how the decoupling of the thermal energy stored in the thermal store via the air preheating device could function. - WO 2013/014664 A2 discloses another kind of hybrid power station, which mixes thermal energy from different energy sources, stores it and provides it for a generator.
- WO 2014/076849 A1 discloses another kind of device for providing thermal energy for a generator, wherein energy is conducted directly to the generator via a heat carrier fluid cycle and thermal energy is fed to a storage tank via a separate, second heat carrier fluid cycle which thermal energy is conducted to the generator as required.
-
EP 2 562 373 A1 presents an IGCC (integrated gasification combined cycle) process, in which some of the thermal energy of the synthesis gas created by said process is converted into electrical energy via a Rankine cycle. - WO 2014/044549 A2 furthermore discloses a different kind of method for charging and discharging a thermal store, in which the corresponding cycles are designed as a Rankine cycle. In the charging cycle heat is transferred from a gaseous working fluid via a first heat exchanger to a liquid storage medium of the thermal store.
- The object of the present invention is therefore that of creating a thermal power station of the kind mentioned in the introduction of simple design, in which the thermal energy stored in the thermal store can be fed back as efficiently as possible.
- This object is achieved by a thermal power station having the features of
claim 1 and a method for storing heat in a thermal power station having the features ofclaim 11. - In accordance with the invention the thermal store comprises a first container for a heat store medium when it is cold, a second container for the heat store medium when it is hot, and a heat exchanger which is connected to the first container and to the second container, wherein the heat exchanger is connected to the water-steam cycle via a water-steam feed line and a water-steam discharge line, wherein the heat store medium can be conveyed from the first container via the heat exchanger to the second container in order to absorb heat from the water and steam, wherein the thermal store comprises an additional heat exchanger which is connected to the first container and to the second container, wherein an air feed line for feeding air into the additional heat exchanger and an air discharge line for discharging the air from the additional heat exchanger are provided, wherein the heat store medium can be conveyed from the second container via the additional heat exchanger to the first container in order to dissipate heat to the air, wherein the air discharge line is connected to the feed for combustion air into the combustion chamber.
- When charging the thermal store, the heat store medium is guided from the first container via the heat exchanger into the second container, wherein the heat store medium is heated by absorbing heat from the water and steam. The water and steam is preferably branched from the water-steam cycle between the steam generator and the turbine.
- When charging the thermal store the heat store medium itself is advantageously moved, whereby the heat exchange can be particularly efficient. When discharging the thermal store the heat store medium is conveyed in the opposite direction from the second container via an additional heat exchanger to the first container. During this process, an airflow is guided through the additional heat exchanger, at which the heat store medium outputs its heat. The heat store medium is thus cooled, and the airflow is heated accordingly. The airflow is then fed to the feed into the combustion chamber of the steam generator, such that the thermal energy stored in the thermal store is in turn available for the steam generation. Interventions involving the complex water-steam cycle of the thermal power station can thus be minimised advantageously. The steam generator can have a wide range of different embodiments, however these have long been known in the prior art and therefore do not require any further explanations. The steam generator can therefore comprise in particular an evaporator, a superheater, a feed water preheater, an air preheater, and a furnace, for example for coal, oil, biomass or gas. It is in any case essential that the charging of the thermal store in the heat exchanger occurs by means of water and steam, and the discharging of the thermal store in the additional heat exchanger occurs by means of air. The heat exchanger and the additional heat exchanger are structurally separate from one another here. The heat exchanger and the additional heat exchanger can thus be adapted selectively to the different requirements of the charging process and discharging process and also to the various types of heat carrier media (water and steam in the case of the heat exchanger, air in the case of the additional heat exchanger). Since air has a much lower heat transfer coefficient than water and steam, the required heat exchange surfaces in the additional heat exchanger are much greater than in the heat exchanger with identical heat flow and identical temperature difference. By using separate heat exchangers, these differences can be easily taken into account. If, for example, the water and steam in the heat exchanger and the air in the additional heat exchanger are guided through line arrangements, in particular tube bundles, the cross-section of the line arrangement in the additional heat exchanger can thus be much greater than the cross-section of the line arrangement in the heat exchanger.
- In accordance with a particularly preferred embodiment a first shut-off device is provided between the first container and the heat exchanger and/or a second shut-off device is provided between the first container and the additional heat exchanger and/or a third shut-off device is provided between the second container and the heat exchanger and/or a fourth shut-off device is provided between the second container and the additional heat exchanger. The aforesaid shut-off devices can be switched between an open position enabling the passage of the heat store medium and a blocking position blocking the passage of the heat store medium. In a preferred embodiment the first shut-off device and the third shut-off device in the charging state of the thermal store are arranged in the open position, such that the heat store medium can flow from the first container via the heat exchanger to the second container. By contrast, at least the second shut-off device, in particular also the fourth shut-off device, is arranged in the closed position in the charging state of the thermal store, such that the heat store medium cannot pass from the first container into the heat exchanger. In the discharging state of the thermal store the switched positions of the shut-off devices can be reversed. Thus, at least the third shut-off device, in particular also the first shut-off device, in the charging state of the thermal store can be arranged in the closed position, such that the heat store medium cannot pass from the second container into the heat exchanger. By contrast, the fourth shut-off device and the second shut-off device are arranged in the open position in the discharging state of the thermal store, such that the heat store medium can flow from the second container via the additional heat exchanger into the first container.
- Solid particles, in particular sand or corundum, are preferably arranged as heat store medium in the first and/or second container. This embodiment in particular is associated with the advantage that these heat store media can be used at much higher temperatures. These materials also have particularly high long-term stability and can be acquired economically.
- In a preferred embodiment the additional heat exchanger is designed for discharging the thermal store for a direct heat exchange between the solid particles and the air. The surfaces of the solid particles advantageously form large heat exchange surfaces which enable an effective dissipation of heat to the air. By contrast, the heat exchanger for charging the thermal store is preferably designed for indirect heat transfer between the heat store medium and the water and steam, for example by means of a line arrangement.
- An embodiment in which a fluidised bed heat exchanger is provided each as heat exchanger and/or as additional heat exchanger is particularly preferred. When discharging the thermal store, the air required for the fluidisation of the heat store medium in the additional heat exchanger can additionally be used as heat carrier medium for the withdrawal of thermal energy. The low heat transfer coefficient of air can advantageously be compensated by the very large heat exchanger surfaces in the fluidised layer. Here, the volume flow of the air in the additional heat exchanger during discharging can be much higher than the volume flow of a fluidisation air of the heat exchanger during charging of the thermal store. In the additional heat exchanger for discharging the thermal store, a direct heat exchange can take place between the air and the heat store medium. By contrast, an indirect heat exchange preferably can be provided between the water and steam and the heat store medium in the heat exchanger for charging the thermal store. For this purpose, the water-steam feed line and the water-steam discharge line can be connected within the heat exchanger by a line arrangement, in particular by a tube bundle. The line arrangement comprises heat exchange surfaces for heat exchange between the heat store medium and the water and steam.
- As is generally usual in thermal power stations, an air preheater for preheating the combustion air is preferably provided for the combustion chamber. The air preheater can be connected on the one hand to a fresh air inlet and on the other hand to an output line for waste combustion gases leading away from the combustion chamber of the steam generator, such that the combustion air flowing from the fresh air inlet into the air preheater is preheated by heat exchange with the waste combustion gases before the combustion air enters the combustion chamber.
- In a structurally simple variant the air feed for the additional heat exchanger is branched from a connection line between the air preheater and the combustion chamber. A shut-off element is preferably provided between the air preheater and the air feed for the additional heat exchanger which shut-off element preferably is adjustable substantially continuously between an open position allowing the airflow to pass through and a closed position blocking the passage of the airflow. In addition, the connection line preferably comprises a further shut-off element which likewise is adjustable preferably substantially continuously between an open position and a closed position. The volume flow for the air feed into the additional heat exchanger can thus be adjusted. In the discharging state of the thermal store a first volume flow can be branched from the connection line via the bypass line into the air feed for the additional heat exchanger, wherein the first volume flow is designed to enable the withdrawal of the thermal energy of the heat store medium in the airflow. In this embodiment the air preheater and the air feed for the additional heat exchanger in the discharging state of the thermal store are therefore connected in series.
- In the charging state of the thermal store, a second volume flow can be branched from the connection line into a further air feed for the heat exchanger in a preferred embodiment in order to enable a fluidisation of the heat store medium in the heat exchanger. The second volume flow of the branched airflow can be lower than the first volume flow, since the air in the heat exchanger can be used merely for fluidisation, but not for heat absorption.
- In a further preferred variant, the air preheater is connected to a fresh air inlet, wherein the air feed for the additional heat exchanger is connected to a fluidisation air inlet. In this variant the air feed for the additional heat exchanger is connected to a dedicated fluidisation air inlet, via which an airflow for the additional heat exchanger can be provided independently of the fresh air inlet for the air preheater. An adaptation to the different pressure conditions and mass flows can thus be achieved advantageously. In this embodiment the flow path between the fluidisation air inlet and the air feed for the additional heat exchanger is preferably free from an air preheater, such that air at ambient temperature can be introduced into the additional heat exchanger. This has the advantage that the temperature spread for the cooling of the heat store medium in the heat exchange with the air can be maximised.
- In order to provide the necessary volume flows in the charging and discharging state of the thermal store, it is favourable if the fresh air inlet is connected to a fresh air fan and/or the fluidisation air inlet is connected to a fluidisation fan. The volume flows at the fresh air inlet and at the fluidisation air inlet can therefore advantageously be controlled independently of one another.
- In order to be able to guide the waste combustion gases in the charging state of the thermal store via the air preheater and to ensure effective cooling of the waste combustion gases in the discharging state, an output line for discharging waste combustion gases from the combustion chamber is preferably provided, which output line comprises a line portion leading into the air preheater and a further line portion leading into a water preheater of the water-steam cycle.
- In a preferred embodiment an electrical heating element, in particular a resistance heater, is installed in the heat exchanger. The electrical heating element can be connected in particular to an electricity grid in order to use excess power to heat the heat store medium. In this embodiment the thermal power station comprises at least a first and a second operating state. In the first operating state the heat store medium, as described before, can be heated via the water and steam and cooled via the air. In the second operating state the electrical heating element is switched on in order to perform or support the heating of the heat store medium alternatively or in parallel to the absorption of heat from the water and steam, for example in order to reach an optimal operating temperature.
- The method according to the invention for storing heat of a thermal power station which comprises a steam generator with a combustion chamber and a feed for combustion air and a water-steam cycle comprises at least the following steps:
-
- conveying a heat store medium when it is cold from a first container via a heat exchanger to a second container,
- conducting water and steam from the water-steam cycle through the heat exchanger with heat being exchanged with the heat store medium,
- conveying the heat store medium when it is hot from the second container via an additional heat exchanger into the first container,
- conducting air through the additional heat exchanger with heat being exchanged with the heat store medium when it is hot, and
- feeding the air as combustion air into the combustion chamber.
- The invention will be explained in greater detail hereinafter with reference to preferred exemplary embodiments, but is not limited thereto. In the drawing:
-
FIG. 1 shows a block diagram of a thermal power station according to the invention, in which the thermal energy of a steam flow branched between a steam generator and a turbine is dissipated in a heat exchanger to a powdery heat store medium, wherein the stored thermal energy is fed back as required in an additional heat exchanger from the heat store medium into an airflow for a combustion chamber of the steam generator; -
FIG. 2 shows a block diagram of the essential components of the thermal power station according toFIG. 1 ; and -
FIG. 3 shows a block diagram of a further thermal power station according to the invention. -
FIG. 1 schematically shows athermal power station 1 in the form of a steam power station with asteam generator 2 which comprises a combustion chamber 3 (shown separately for the sake of clarity) with a feed 4 for combustion air and afeed 39 for fuel. A water-steam cycle 5 is connected to thesteam generator 2. Thesteam generator 2 is connected via afirst valve 6 to a turbine 7, to which there is connected a generator G. The water-steam cycle 5 additionally comprises further components provided as standard in the prior art, in particular acondenser 8, a feedwater pump 9 and afeed water preheater 10. - The
thermal power station 1 additionally comprises athermal store 11 shown in a simplified manner inFIG. 1 and visible in detail inFIG. 2 for buffering thermal energy of the steam guided in the water-steam cycle 5. - As can be seen in particular from
FIG. 2 , thethermal store device 11 comprises afirst container 12 for a heat store medium when it is cold, asecond container 13 for the heat store medium when it is hot and a heat exchanger 14 connected to thefirst container 12 and to thesecond container 13. A bed of solid particles, in particular sand, is provided as heat store medium. The heat exchanger 14 is connected to the water-steam cycle 5 via a water-steam feed line 15 and a water-steam discharge line 16. Apump 17 visible inFIG. 1 is arranged in the water-steam discharge line 16 in order to compensate for any pressure losses. Avalve 40 is provided in the water-steam feed line 15. The heat store medium can be conveyed from thefirst container 12 via the heat exchanger 14 to thesecond container 13 in order to absorb heat from the water and steam. - In addition, the
thermal store 11 comprises anadditional heat exchanger 18, which is connected to thefirst container 12 and to thesecond container 13. Anair feed 19 for feeding air into theadditional heat exchanger 18 and anair discharge line 20 for discharging the air once it has passed through theadditional heat exchanger 18 is also provided. In a discharging process the heat store medium is conveyed from thesecond container 13 via theadditional heat exchanger 18 to thefirst container 12 in order to dissipate heat to the air. Theair discharge line 20 is connected to the feed 4 into thecombustion chamber 3, such that the air heated in theadditional heat exchanger 18 in the heat exchange with the heat store medium can be introduced as combustion air into thecombustion chamber 3. - As can be seen from
FIG. 2 , a first shut-offdevice 21 is provided between thefirst container 12 and the heat exchanger 14, a second shut-offdevice 22 is provided between thefirst container 12 and theadditional heat exchanger 18, a third shut-offdevice 23 is provided between thesecond container 13 and the heat exchanger 14, and a fourth shut-offdevice 24 is provided between thesecond container 13 and theadditional heat exchanger 18. - In the shown embodiment, fluidised bed heat exchangers are provided as heat exchanger 14 and as
additional heat exchanger 18. In this case the heat exchanger 14 comprises a fluidisation air feed (not shown inFIG. 2 ), by means of which the bed of heat store medium can be fluidised. The fluidisation air, however, is not provided as a heat carrier medium for charging the heat store medium in the heat exchanger 14. The heat is dissipated to the heat store medium substantially completely by the steam fed via the water-steam feed line 15. - As can be seen from
FIG. 1 , thethermal power station 1 comprises anair preheater 25 for preheating the combustion air prior to entry into thecombustion chamber 3. Theair preheater 25 is connected via afresh air fan 26 to afresh air inlet 27. The waste combustion gases generated in thecombustion chamber 3 are delivered into anoutput line 28, which is connected to theair preheater 25. A heat exchange between the waste combustion gases in theoutput line 28 and the fresh air coming from thefresh air inlet 27 occurs in theair preheater 25, such that the waste combustion gases are cooled and the fresh air is preheated accordingly. The cooled waste combustion gases can then be released into the surrounding environment. - In the variant of
FIG. 1 abypass line 29 leads away from aconnection line 30 between theair preheater 25 and thecombustion chamber 3 which bypassline 29 is connected to theair feed 19 into theadditional heat exchanger 18. Theair discharge line 20 from theadditional heat exchanger 18 leads back into theconnection line 30. A shut-offelement 31 is arranged in thebypass line 29. An additional shut-offelement 32 is arranged in theconnection line 30. With the aid of the shut-offelement 31 and the additional shut-offelement 32, the volume flow in thebypass line 29 can be adjusted. In the discharging state a volume flow of air that is much higher as compared to a fluidisation volume flow is guided via thebypass line 29 into theadditional heat exchanger 18, so that the airflow can function as a heat carrier medium for the thermal energy stored in the heat store medium. - An electrical heating element in the form of a
resistance heater 40 is additionally visible inFIG. 2 schematically and is guided into the heat exchanger 14. Theresistance heater 40 is connected to a power grid in order to be able to heat the heat store medium in the heat exchanger 14 as required by conversion of electrical energy into thermal energy. Theresistance heater 40 can be activated alternatively or additionally to the water-steam cycle 5, for example so as to set an optimal operating temperature of the heat store medium. -
FIG. 3 shows an alternative variant which differs from the embodiment ofFIG. 1 in respect of the discharging process. Merely the differences between the embodiment according toFIG. 3 and that ofFIG. 1 will be discussed hereinafter. - According to
FIG. 3 theair feed 19 for theadditional heat exchanger 18 is connected to afluidisation air inlet 33 separate from thefresh air inlet 27. The key advantage of this embodiment lies in the possibility of being able to use fans or compressors especially adapted to the volume flows and pressures. In addition, theair preheater 25 can be decoupled from the higher pressure after thefluidisation air inlet 33, which leads to a more economical embodiment of theair preheater 25. Thefluidisation air inlet 33 is connected in the shown embodiment to afluidisation fan 34. In this embodiment theoutput line 28 comprises a line portion 35 leading into theair preheater 25 and afurther line portion 37 leading into awater preheater 36 of the water-steam cycle 5. In the charging state the waste combustion gases are guided via the line portion 35 to theair preheater 25. Once the waste combustion gases have cooled in theair preheater 25, the waste combustion gases are discharged into the surrounding environment. In the discharging state the waste combustion gases are guided via theline portion 37 into thewater preheater 36 of the water-steam cycle 5. The waste combustion gases can thus be effectively cooled during the discharge in the switched-off state of thefresh air fan 26. In order to be able to conduct the waste combustion gases to theair preheater 25 during the charging process and to thewater preheater 36 during the discharging process, a shut-offvalve 38 is arranged in each of theline portions 35 and 37. - A method having at least the following steps can therefore be carried out: conveying a heat store medium when it is cold from a
first container 12 via a heat exchanger 14 to asecond container 13, and in the meantime conducting water and steam of the water-steam cycle 5 of thethermal power station 1 through the heat exchanger 14 with dissipation of heat to the heat store medium, conveying the heat store medium when it is hot from thesecond container 13 via theadditional heat exchanger 18 into thefirst container 12, and in the meantime conducting air through the additional heat exchanger with absorption of heat from the heat store medium when it is hot, and then feeding the air as combustion air into thecombustion chamber 3.
Claims (11)
1. A thermal power station having a steam generator, which comprises a combustion chamber with a feed for combustion air, having a water-steam cycle, which is connected to the steam generator, and having a thermal store, which is connected to the water-steam cycle, wherein the thermal store comprises a first container for a heat store medium when it is cold, a second container for the heat store medium when it is hot, and a heat exchanger which is connected to the first container and to the second container, wherein the heat exchanger is connected to the water-steam cycle via a water-steam feed line and a water-steam discharge line, wherein the heat store medium can be conveyed from the first container via the heat exchanger to the second container in order to absorb heat from the water and steam, wherein the thermal store comprises an additional heat exchanger which is connected to the first container and to the second container, wherein an air feed line for feeding air into the additional heat exchanger and an air discharge line for discharging the air from the additional heat exchanger are provided, wherein the heat store medium can be conveyed from the second container via the additional heat exchanger to the first container in order to dissipate heat to the air, wherein the air discharge line is connected to the feed for combustion air into the combustion chamber.
2. The thermal power station according to claim 1 , wherein a first shut-off device is provided between the first container and the heat exchanger and/or a second shut-off device is provided between the first container and the additional heat exchanger and/or a third shut-off device is provided between the second container and the heat exchanger and/or a fourth shut-off device is provided between the second container and the additional heat exchanger.
3. The thermal power station according to claim 1 , wherein solid particles, including sand or corundum, are arranged as heat store medium in the first and/or second container.
4. The thermal power station according to claim 1 , wherein a fluidised bed heat exchanger is provided each as the heat exchanger and/or as the additional heat exchanger.
5. The thermal power station according to claim 1 , wherein air preheater for preheating the combustion air for the combustion chamber is provided.
6. The thermal power station according to claim 5 , wherein the air feed line for the additional heat exchanger is branched from a connection line between the air preheater and the combustion chamber.
7. The thermal power station according to claim 5 , wherein the air preheater is connected to a fresh air inlet, wherein the air feed line for the additional heat exchanger is connected to a fluidisation air inlet.
8. The thermal power station according to claim 7 , wherein the fresh air inlet is connected to a fresh air fan and/or the fluidisation air inlet is connected to a fluidisation fan.
9. The thermal power station according to claim 6 , wherein an output line for discharging waste combustion gases from the combustion chamber is provided, where the output line comprises a line portion leading into the air preheater and an additional line portion leading into a water preheater of the water-steam cycle.
10. The thermal power station according to claim 1 , wherein an electrical heating element, including a resistance heater, is installed in the heat exchanger.
11. A method for storing heat in a thermal power station which comprises a steam generator with a combustion chamber and a feed for combustion air and a water-steam cycle, said method having the following steps:
conveying a heat store medium when it is cold from a first container via a heat exchanger to a second container,
conducting water and steam from the water-steam cycle (5) through the heat exchanger with heat being exchanged with the heat store medium,
conveying the heat store medium when it is hot from the second container via an additional heat exchanger into the first container,
conducting air through the additional heat exchanger with heat being exchanged with the heat store medium when it is hot, and
feeding the air as combustion air into the combustion chamber.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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ATA50530/2016 | 2016-06-10 | ||
AT505302016 | 2016-06-10 | ||
ATA50922/2016 | 2016-10-14 | ||
ATA50922/2016A AT518186B1 (en) | 2016-06-10 | 2016-10-14 | Thermal power plant and method for storing heat |
PCT/AT2017/060149 WO2017210713A1 (en) | 2016-06-10 | 2017-06-09 | Thermal power station |
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US20190264579A1 true US20190264579A1 (en) | 2019-08-29 |
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US16/308,419 Abandoned US20190264579A1 (en) | 2016-06-10 | 2017-06-09 | Thermal power station |
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US (1) | US20190264579A1 (en) |
EP (1) | EP3469191A1 (en) |
AT (1) | AT518186B1 (en) |
WO (1) | WO2017210713A1 (en) |
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CN112761745B (en) * | 2021-01-20 | 2022-06-03 | 中国科学院力学研究所 | Hot water energy storage system and method for thermal generator set |
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JP5461666B1 (en) * | 2012-11-15 | 2014-04-02 | 三井造船株式会社 | Thermal storage power generation apparatus and control method thereof |
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- 2016-10-14 AT ATA50922/2016A patent/AT518186B1/en active
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2017
- 2017-06-09 US US16/308,419 patent/US20190264579A1/en not_active Abandoned
- 2017-06-09 WO PCT/AT2017/060149 patent/WO2017210713A1/en unknown
- 2017-06-09 EP EP17733340.8A patent/EP3469191A1/en not_active Withdrawn
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US3974642A (en) * | 1973-01-26 | 1976-08-17 | Fives-Cail Babcock Societe Anonyme | Hybrid cycle power plant with heat accumulator for storing heat exchange fluid transferring heat between cycles |
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EP3469191A1 (en) | 2019-04-17 |
WO2017210713A1 (en) | 2017-12-14 |
AT518186B1 (en) | 2017-08-15 |
AT518186A4 (en) | 2017-08-15 |
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