EP3857032A1 - Procédé d'exploitation d'une centrale électrique en vue de la production d'énergie électrique par combustion d'un combustible contenant du carbone et système correspondant d'exploitation d'une centrale électrique - Google Patents

Procédé d'exploitation d'une centrale électrique en vue de la production d'énergie électrique par combustion d'un combustible contenant du carbone et système correspondant d'exploitation d'une centrale électrique

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Publication number
EP3857032A1
EP3857032A1 EP19733695.1A EP19733695A EP3857032A1 EP 3857032 A1 EP3857032 A1 EP 3857032A1 EP 19733695 A EP19733695 A EP 19733695A EP 3857032 A1 EP3857032 A1 EP 3857032A1
Authority
EP
European Patent Office
Prior art keywords
power plant
carbon dioxide
fuel
exhaust gas
heat engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19733695.1A
Other languages
German (de)
English (en)
Other versions
EP3857032B1 (fr
Inventor
Peter Moser
Georg Wiechers
Knut Stahl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RWE Power AG
Original Assignee
RWE Power AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RWE Power AG filed Critical RWE Power AG
Publication of EP3857032A1 publication Critical patent/EP3857032A1/fr
Application granted granted Critical
Publication of EP3857032B1 publication Critical patent/EP3857032B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F01K13/00—General layout or general methods of operation of complete plants
    • 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
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • 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
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/006—Auxiliaries or details not otherwise provided for
    • 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
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/064—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle in combination with an industrial process, e.g. chemical, metallurgical
    • 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
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/70—Application in combination with
    • F05D2220/76—Application in combination with an electrical generator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/61—Removal of CO2

Definitions

  • the present invention relates to a method for operating a power plant for generating electrical energy for delivery to at least one consumer by burning a carbon-containing fuel with a carbon dioxide separation and a corresponding system for operating such a power plant.
  • the object of the present invention is to at least partially overcome the disadvantages known from the prior art and, in particular, to achieve an improvement in the overall efficiency of a power plant with downstream carbon dioxide separation.
  • a carbon-containing fuel is preferably understood to mean fossil fuels such as coal, in particular lignite or hard coal, petroleum and / or natural gas, as well as biomass and residues such as tars, waste and / or production waste.
  • fossil fuels such as coal, in particular lignite or hard coal, petroleum and / or natural gas, as well as biomass and residues such as tars, waste and / or production waste.
  • a heat engine for generating electrical energy allows in particular an increase in the current output of the system from the power plant and heat engine at peak loads.
  • a heat engine can be started up quickly and can be controlled over a wide range in terms of the amount of electricity delivered, which does not apply to conventional fossil-fired power plants or only applies to a limited extent. This makes it possible, in the event of peak loads and / or when the energy fed into a power grid breaks in, in particular from regenerative react quickly to energy sources in order to ensure grid stability.
  • the generation of warm exhaust gas in the heat engine permits flexible use of the thermal energy contained therein to further increase the efficiency of the overall system comprising the power plant, carbon dioxide separation, fuel synthesis and, if appropriate, other components such as fuel processing or fuel drying.
  • the heating of combustion air of a power plant is understood in particular to mean that the combustion air used in a firing of the power plant, for example a coal dust furnace, is heated before it flows into the firing.
  • the heating can take place in an air preheater that is operated, for example, by flue gas from the power plant and to which exhaust gas from the heat engine is now at least temporarily supplied, so that the temperature and / or the volume flow of the mixture of flue gas and exhaust gas can be increased.
  • the heating of the process medium of the power plant is understood in particular to mean the heating of water which is heated to generate steam by the firing of the power plant and which, for example, is fed to at least one turbine for tension after simultaneous flow of the firing as steam under pressure for simultaneous power generation.
  • the use in drying the fuel of the power plant is understood to mean that the waste heat from the exhaust gas of the heat engine is used in the drying of the fuel. This is particularly advantageous when considering a coal-fired power plant, since lignite in particular has to dry before being converted into electricity. Especially with dust-fired power drying can also include grinding. Even when electricity is supplied to biomass, it is advantageously possible to dry it at least partially by the waste heat from the heat engine before it is fed to the furnace.
  • waste heat serves as a heat source in such a carbon dioxide separation process.
  • the waste heat can at least partially supply the heating of a solvent stream with energy, so that an input of other energy, for example via hot steam, can be reduced.
  • An embodiment is preferred in which the exhaust gas is fed to the flue gas of the power plant.
  • Flue gas and at least part of the exhaust gas are thus mixed. Since at least part of its waste heat is regularly removed from the flue gas for reasons of efficiency increase, an increase in the efficiency of the overall system can be achieved in a simple manner, since by adding the exhaust gas an adjustment of the temperature of the mixture, preferably an increase in the temperature of the Mixture can be achieved and thermal use can take place in existing facilities such as heat exchangers.
  • the addition to the flue gas is also preferably carried out after part of the waste heat of the exhaust gas has already been used for at least one of the processes a) to d). In this context, it is preferred that the exhaust gas is supplied to the flue gas before it is supplied to at least one of the following processes: i) heating the combustion air of the power plant;
  • the process medium preferably comprises water and / or water vapor.
  • Water vapor and water are regularly heated in the circuit as a process medium by the firing of the power plant in order to drive at least one turbine to generate electricity by means of the pressurized water vapor, whereby the steam is expanded and, if necessary, at least partially condensed to water, which then is warmed up again and evaporated.
  • a carbon dioxide cycle can be achieved by carrying out a carbon dioxide separation for separating the carbon dioxide from the flue gas and the exhaust gas, since the carbon dioxide from the exhaust gas, which is produced by the combustion of the fuel generated from the separated carbon dioxide, can be separated again.
  • the efficiency of the corresponding process and thus the overall efficiency of the power plant can be increased.
  • a diesel engine has proven to be particularly efficient, since on the one hand it can be operated with high efficiency and on the other hand the fuel dimethyl ether or methanol or mixtures comprising dimethyl ether and methanol, which are preferably synthesized from carbon dioxide, can be burned directly therein .
  • the fuels methane and methanol can advantageously be combusted in a gas engine, in particular a gas Otto engine or a gas diesel engine.
  • a gasoline engine or a Stirling engine can also preferably be used as the internal combustion engine.
  • a process control is preferred in which the fuel comprises at least one of the following substances:
  • methanol and methane can be used as raw materials for the synthesis of other fuels.
  • both methanol and methane can be burned directly in heat engines.
  • DME is particularly preferred because DME is also available as a raw material for the synthesis of other substances and, moreover, practically burns soot free.
  • the method described here leads to an increase in the overall efficiency and a reduction in the carbon dioxide emissions and also the emissions of nitrogen oxides (NO x ) and soot.
  • DME is preferably obtained via a catalytic conversion of carbon dioxide with (electrolytically generated) hydrogen.
  • An embodiment is preferred in which the at least one consumer of electrical energy is connected to the power plant via a power network.
  • the supply of a power grid in which usually several electrical consumers are at least partially connected to the power plant for power supply, is a preferred application of the present invention.
  • the heat engine also feeds the generated electrical energy at least partially into the power grid.
  • a method is preferred in which the heat engine is operated as a function of the electrical load in the power grid.
  • this allows the heat engine to be switched on when a nominal power of the power plant is exceeded, i.e. a higher electrical power would have to be fed into the power grid than the power plant can nominally deliver, ie a peak load situation exists.
  • a pure (binary) connection of the heat engine can take place, but operation can also take place as a function of the electrical load in the power grid, in which the power output of the heat engine is at least in some areas dependent on the load in question Power grid is done.
  • the heat engine is therefore preferably operated in such a way that the electrical power it outputs is defined as a function of the electrical load in the power grid.
  • a synthesis system for synthesizing a fuel from carbon dioxide characterized in that a heat engine is formed, by means of which the fuel is combustible with the generation of electrical energy and exhaust gas, the heat engine at least temporarily thermally with at least one of the following elements for transmission at least part of the waste heat of the exhaust gas can be connected:
  • the system preferably further comprises at least one mixer for mixing exhaust gas (the heat engine) and a flue gas from the power plant.
  • the details and advantages disclosed for the method according to the invention can be transferred and applied to the system according to the invention and vice versa.
  • the method and the system according to the invention allow a significant increase in the overall efficiency of the system compared to conventionally operated power plants with carbon dioxide separation or compared to synthesis plants for the synthesis of a fuel from carbon dioxide from other sources, for example from the air.
  • the invention and the technical environment are explained in more detail with reference to the fi gures. It should be pointed out that the invention is not intended to be limited by the exemplary embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and / or knowledge from other figures and / or the present description. They show schematically:
  • Fig. 1 shows a system from a power plant with carbon dioxide separation
  • FIG. 2 shows an example of a carbon dioxide separation system as part of a system for operating a power plant
  • Fig. 3 shows an example of a drying plant as an optional element
  • 9 shows an example of a power network with consumers; and 10 shows an example of a system with a power plant.
  • FIG. 1 schematically shows a power plant 1.
  • a carbon-containing fuel is burned, thereby generating steam, which in turn is used to generate electrical energy via the expansion via at least one turbine.
  • the resulting flue gas from the power plant 1 is kohlendioxidhal.
  • the power plant 1 is preferably a fossil-fired power plant, in which fossil fuels such as coal, in particular lignite or hard coal, petroleum and / or gas are burned, and / or a power plant for burning biomass. In this case, the configuration as a dry lignite power plant is preferred.
  • the diagram shown in FIG. 1 does not relate to the design of the power plant 1 as such, which is known; rather, FIG. 1 shows the thermal interaction of certain elements of the power plant 1 and other elements.
  • the overall system has, in addition to the power plant 1, a carbon dioxide separation system 2 and a drying system 3. Furthermore, the system shown comprises a heat engine 4.
  • a typical carbon dioxide separation process is based on a so-called amine scrubbing, in which the gas containing carbon dioxide (for example the flue gas from power plant 1) is produced by an alkaline aqueous solution of amines, for example monoethanolamine (MEA), Diethanolamine (DEA), methyldiethanolamine (MDEA)), piperazine (PZ), aminomethylpropanol (AMP) and / or diglycolamine (DGA), and the carbon dioxide is separated from the gas by changing absorption and desorption processes.
  • An example of a carbon dioxide separation plant 2 is shown schematically in FIG. 2, which corresponds to the prior art.
  • the carbon dioxide separation system 2 comprises an absorber 201 and a desorber 202.
  • the absorber 201 is flowed through by the flue gas 7 of the power plant 1.
  • the exhaust gas 203 which essentially consists of nitrogen, leaves the absorber 201; the carbon dioxide was dissolved in the absorber 201 in a solvent, an aqueous solution of at least one amine.
  • the absorber 201 is charged with a first solvent inflow 204, a first solvent outflow 205 is discharged from the absorber 201.
  • the first solvent inflow 204 is low in carbon dioxide, while the first solvent outflow 205 is rich in carbon dioxide.
  • the first solvent inflow 204 is fed to the absorber 201 at a comparatively low temperature of approximately 40-60 ° C.
  • the first solvent outflow 205 is fed to a heat exchanger 206, which is designed as a countercurrent heat exchanger.
  • the first solvent outflow 205 is heated in the heat exchanger 206 by heat exchange with a second solvent outflow 207.
  • This second solvent stream stream 207 leaves the desorber 202.
  • the second solvent stream stream 207 is also low in carbon dioxide, but is at a significantly higher temperature level than the first solvent stream 204 when it flows into the absorber 201. As a result, it heats up second solvent outflow 207 via the heat exchanger 206 to the second solvent outflow 205 which, after heating, leads to the desorber 202 as the second solvent inflow 208.
  • hot steam flows against the solvent stream, which is generated from solvent in a reboiler 209.
  • a partial stream of the solvent which is drawn off in the desorber sump 214 of the desorber 202, is heated by steam 213, here low-pressure steam.
  • the solvent releases the carbon dioxide, which is in the top of the desorber 202 withdrawn as a carbon dioxide stream 210 and then cooled by a cooler 211 ge and fed for further use.
  • FIG. 3 shows an example of a conventional drying process for lignite in a drying plant 3.
  • Raw lignite 301 is fed to a raw lignite bunker 302 and from there fed to a dryer 304 via various mills 303 as required.
  • the dryer 304 is heated by steam 305, which emits its heat to the lignite to be dried, which is finely milled in the mills 303, and leaves the dryer 304 again as condensate 306.
  • the dried lignite also referred to as dry lignite 307, is discharged from the dryer 304 via a cooler 308 after a possible subsequent grinding in a mill 309 Power plant 1.
  • the vapors 310 formed in the dryer 304 are cleaned in a filter 311 of the lignite dust contained therein, which is also added to the dry lignite 307. After filtering, the vapors 310 are condensed in a vapor condenser 312 which is flowed through, for example, by a process medium (boiler feed water) or combustion air, which are heated thereby. The resulting vapor condensate 313 is removed.
  • the vapor 310 can optionally be compressed via a vapor compressor 314.
  • the power plant 1 has thermal sources, on the one hand, from heat sources, that is to say process areas which provide heat or from which heat is to be dissipated, which can be used in other processes.
  • a turbine 5 in addition to the flue gas not shown in FIG. 1, this is, for example, a turbine 5 (see FIG. 1) by means of which a turbine (not shown) is shown. ter generator is driven to generate electricity.
  • the turbine 5, particularly in modern power plants 1, is often the combination of a high-pressure turbine, in which the steam generated is first expanded from a high pressure level to a medium pressure level, and at least one subsequent turbine, for example a low-pressure turbine the steam is expanded from a medium pressure level to a low pressure level or a combination of a medium pressure and a low pressure turbine.
  • the turbines each have a generator for power generation.
  • the steam present when leaving the turbine 5 is comparatively warm, in particular has temperatures from 100 ° C [degrees Celsius] to 300 ° C.
  • heat sinks ie used in process steps that are endothermic, ie to process steps that require the supply of thermal energy to be supplied by the steam supplied.
  • This is necessary, for example, in the context of carbon dioxide separation 2 in detergent regeneration 6.
  • the steam can be fed to a drying system 3.
  • Another heat source in the system is, for example, the desorber vapors 212 of the carbon dioxide separation system 2 (see description of FIG.
  • the desorber vapor 212 can be used for preheating the combustion air of the power plant 1 by supplying the desorber vapor 212 to an air preheater 11.
  • Other heat sources are, for example, the vapors 310 of the drying system 3, depending on the use of a vapor compressor 314 as an uncompressed vapor 17 or as a compressed vapor 18.
  • the corresponding vapor 310 can be used as a heat source, for example for preheating the feed water of the boiler of the power plant 1, preheating the condensate or serve to preheat the steam supplied to a high-pressure or low-pressure turbine. Alternatively or additionally, the vapor 310 can be used for preheating the combustion air of the power plant 1.
  • the system also has at least one heat engine 4 which can increase the electrical power output of the power plant 1 in times of increased load.
  • This is a combustion engine, a diesel engine, a gas engine and / or a gas turbine.
  • This heat engine 4 is operated with a fuel which is generated from the carbon dioxide, which is deposited in the carbon dioxide separation plant 2 and then converted into a fuel, for example DME.
  • the combustion of the fuel produces an exhaust gas 8, which is also a heat source, at least part of the thermal energy of the exhaust gas 8 being used in at least one of the processes a) to d) described.
  • FIG. 4 schematically shows a detail of a power plant 1 with a furnace 9, in which coal dust is preferably burned.
  • the boiler 9 operates a boiler system (not shown) for generating and possibly at least temporarily overheating water vapor.
  • combustion air 10 which is supplied to the furnace 9, is heated.
  • an air preheater 11 is formed, which comprises a heat exchanger, via which the combustion air 10 usually passes a heat exchange with the flue gas 7 of the power plant 1 is heated.
  • exhaust gas 8 from the heat engine 4 is mixed with the flue gas 7 upstream of the air preheater 11 at least temporarily. This brings about an increase in the efficiency of the power plant 1 by increasing the temperature of the combustion air 10 reached in the air preheater 11.
  • FIG. 5 shows an alternative situation in which the air preheater 11 is operated exclusively with exhaust gas 8 from the heat engine 4.
  • a mixing device not shown here, is preferably formed, by means of which the exhaust gas 8 is mixed with the flue gas 7 and the mixing ratio between flue gas 7 and exhaust gas 8 can be varied.
  • FIG. 6 schematically shows a further section of a power plant 1, which is designed as a coal-fired power plant with a coal dust burner as a furnace 9.
  • a drying system 3 is formed, which is basically designed, for example, as shown in FIG. 3. Reference is made to the comments made on this figure.
  • the corresponding dryer 304 is usually operated with steam 305.
  • the corresponding dryer 305 can be operated at least partially with waste heat 12, which is transferred from the exhaust gas 8 of the heat engine 4 to the steam 305, for example in a heat exchanger (not shown).
  • the slightly cooled exhaust gas 8 in the heat exchanger can be fed to the flue gas 7 in particular in front of an air preheater 7. This increases the efficiency of the entire power plant 1.
  • Fig. 7 shows schematically a further detail of a power plant 1 with a Fe tion 9.
  • a process medium preheater 13 is formed through which a process medium 14, for example water and / or steam, before implementation can be warmed up and / or overheated by the furnace 9.
  • the process medium preheater 13 which is designed here as a heat exchanger, is simultaneously flowed through by the exhaust gas 8 of the heat engine 4, so that the waste heat 12 of the exhaust gas 8 is used to heat the process medium 13.
  • the exhaust gas 8 cooled thereby can then be added to the flue gas 7 of the power plant upstream of an air preheater 11. In this way, significant increases in the overall efficiency of the power plant 1 can be achieved.
  • FIG. 8 schematically shows a detail of a carbon dioxide separation plant 2 of a power plant, such as the carbon dioxide separation plant 2 shown in FIG. 2.
  • a reboiler 209 is formed, by means of which the solvent in the desorber 202 is heated.
  • the reboiler 209 is at least partially heated at least partially by waste heat 12 from the heat engine 4.
  • a heat exchanger (not shown here) is preferably formed, by means of which at least some of the waste heat 12 is transferred from the exhaust gas 8 to the steam 213, for example.
  • the exhaust gas 8 cooled in this way can then be mixed, for example, with the flue gas 7 of the power plant 1 upstream of an air preheater 11 and / or a process medium preheater 13. As a result, the overall efficiency of the power plant 1 can be increased.
  • FIG. 9 shows, very schematically, a power plant 1 which is connected to a power network 15 with several consumers 16. Basically, it is possible, based on the carbon dioxide separated from the flue gas 7, to carry out energy storage in times of a reduced load on the power network 15, in which a fuel such as DME is synthesized from the carbon dioxide and stored. If the load of the power grid 15 rises above a nominal value, this fuel becomes heat generator 4 for generating electricity burned.
  • a fuel such as DME
  • the carbon dioxide of the exhaust gas 8 of the heat engine 4 can at least partially be separated out of it again, so that a carbon dioxide cycle can be created which one reduces the emissions of carbon dioxide and on the other hand enables a further increase in the overall efficiency of the power plant 1.
  • FIG. 10 schematically shows a system 100 for operating a power plant 1, in particular proposed according to the method according to the invention, comprising the power plant 1, a carbon dioxide separation plant 2 and a synthesis plant 101 for synthesizing a fuel from carbon dioxide.
  • the flue gas 7 is the Koh lendioxidabscheidestrom 2 supplied.
  • the carbon dioxide 19 separated there is fed to the synthesizing plant 101.
  • the fuel 20 synthesized in the synthesis plant 101 for example DME, is stored in a store 102.
  • the system 100 further comprises a heat engine 4 through which the fuel 20 is combustible to produce electrical energy and exhaust gas 8.
  • the exhaust gas 8 can be fed to a mixer 103, in which it can be mixed with the flue gas 7 directly downstream of the power plant 1 and / or the flue gas 7 after leaving the carbon dioxide separation plant 2.
  • the exhaust gas 8 can also first serve as a heat source in the carbon dioxide separator 2 and then be guided into the mixer 103.
  • the mixer 103 is preferably also operated in such a way that the mixture of flue gas 7 and exhaust gas 8 is finally fed to the carbon dioxide separating system 2 for separating the carbon dioxide.
  • the power plant 1 is supplied with dry lignite 307 from a drying plant 3, which is burned with combustion air 8.
  • the combustion air 8 is heated in an air preheater 11, which is at least partially with flue gas 7 and / or exhaust gas 8 is heated, which is emitted by the mixer 103.
  • a process medium 14, such as water is fed to the power plant 1 via a process medium preheater 13.
  • the process medium 13 is preheated at least partially via flue gas 7 and / or exhaust gas, which is emitted by the mixer 103.
  • the exhaust gas 8 can alternatively or additionally be guided through the drying system 3 before flowing into the mixer 103.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un procédé d'exploitation d'une centrale électrique (1) en vue de la production d'énergie électrique destinée à être fournie à au moins un consommateur (16) par combustion d'un combustible contenant du carbone. Le dioxyde de carbone (19) est séparé des gaz de fumée (7) de la centrale électrique (1) et le dioxyde de carbone (19) séparé est au moins partiellement converti en un carburant (20). Le procédé selon l'invention est caractérisé en ce que le carburant (20) est brûlé au moins temporairement dans au moins un moteur thermique (4) avec formation d'un gaz d'échappement (8), de l'énergie électrique étant générée par le moteur thermique (4), laquelle est délivrée à au moins un consommateur (16), et au moins une partie de l'énergie thermique du gaz d'échappement (8) étant utilisée dans au moins un des processus suivants : a) pour le chauffage d'un air de combustion (10) d'une centrale électrique (1) ; b) pour le chauffage d'un fluide de processus (14) de la centrale électrique (1) ; c) dans le cadre d'un séchage du combustible de la centrale électrique (1) ; et d) dans le cadre d'une séparation du dioxyde de carbone.
EP19733695.1A 2018-09-24 2019-06-18 Procédé d'exploitation d'une centrale électrique en vue de la production d'énergie électrique par combustion d'un combustible contenant du carbone et système correspondant d'exploitation d'une centrale électrique Active EP3857032B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018123417.1A DE102018123417A1 (de) 2018-09-24 2018-09-24 Verfahren zum Betrieb eines Kraftwerkes zur Erzeugung von elektrischer Energie durch Verbrennung eines kohlenstoffhaltigen Brennstoffs und entsprechendes System zum Betreiben eines Kraftwerkes
PCT/EP2019/066097 WO2020064156A1 (fr) 2018-09-24 2019-06-18 Procédé d'exploitation d'une centrale électrique en vue de la production d'énergie électrique par combustion d'un combustible contenant du carbone et système correspondant d'exploitation d'une centrale électrique

Publications (2)

Publication Number Publication Date
EP3857032A1 true EP3857032A1 (fr) 2021-08-04
EP3857032B1 EP3857032B1 (fr) 2022-09-21

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WO2020064156A1 (fr) 2020-04-02
DE102018123417A1 (de) 2020-03-26
DK3857032T3 (da) 2022-11-07
LT3857032T (lt) 2022-10-25
US20210363899A1 (en) 2021-11-25
US11913360B2 (en) 2024-02-27
EP3857032B1 (fr) 2022-09-21

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