WO2014147232A1 - Power generation system and method to operate - Google Patents
Power generation system and method to operate Download PDFInfo
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- WO2014147232A1 WO2014147232A1 PCT/EP2014/055725 EP2014055725W WO2014147232A1 WO 2014147232 A1 WO2014147232 A1 WO 2014147232A1 EP 2014055725 W EP2014055725 W EP 2014055725W WO 2014147232 A1 WO2014147232 A1 WO 2014147232A1
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Classifications
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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
- 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
- F01K25/005—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for the working fluid being steam, created by combustion of hydrogen with oxygen
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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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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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
- F01K7/34—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 of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—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 of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Definitions
- Power generation system and method to operate The invention relates to a power generation system comprising an oxy- fuel -burner and a steam cycle.
- the oxygen containing gas is basically pure oxygen with minor impurities generated by for example an air separation unit, which can be of conventional membrane type.
- an oxy- fuel -burner is characterized by burning basically a fuel with an oxygen containing gas wherein said oxygen containing gas has signifi- cant higher oxygen content than ambient air or wherein oxygen is its main component or wherein said oxygen containing gas is preferably pure oxygen with some impurities.
- This oxygen containing gas may contain some further additives but its main component is preferably oxygen.
- the object of enhancing the efficiency of the incipiently defined power generation system is achieved by a power generation system according to the incipiently mentioned type with the further features of the characterizing portion of claim 1. Further the object is achieved by a method of the incipiently mentioned type with the further features of the characterizing portion of the independent method claim.
- One essential aspect of the proposed improvement of the power generation system respectively the method according to the invention is the addition of heat exchangers for preheating of the re-circulated feed water submitted to the oxy-fuel- burner for mixing into exhaust stream of the oxy- fuel -burner (being a working media for a steam cycle) . According to the invention by preheating with extraction steam the cycle performance is improved.
- the steam respective- ly working media (substantially exhaust-fluid of the oxy- fuel-burner) taken from the steam turbine (s) contains carbon- dioxide in a substantial concentration, typically more than 5%, preferably about 10% by volume, which makes the cycle much different from a conventional steam cycle.
- the carbon- dioxide led to the pre-heaters is preferably separated from the pre-heaters and then collected to be routed to an export carbon-dioxide stream.
- a carbon-dioxide compres- sion process for the delivery to a final user - for example enhanced oil recovery or methane synthesis - is integrated in the power generation system respectively method.
- a further beneficial improvement of the process according to the invention is obtained by providing a recuperator respectively first heat exchanger downstream said oxy- fuel -burner before the exhaust-fluid of the oxy- fuel -burner (a first working-media- stream) enters a steam turbine.
- This heat exchanger respectively recuperator re-heats steam respectively the first working-media- stream that has passed a first expansion through said steam turbine, wherein the exhaust-fluid from said oxy- fuel -burner is heating a working-media- stream from said steam turbine.
- This heat exchanger provides a certain protection for the downstream steam turbine as it pro- vides some heat capacity damping thermal gradients from upstream equipment control variations or disturbances. Further this heat exchanger assist in protecting the turbine from possible water droplets carried over from said oxy-fuel- burner .
- Said oxy- fuel -burner is basically a gas generator generating an exhaust gas respectively exhaust fluid from a fuel burned or combusted with essentially pure oxygen.
- This exhaust gas is referred to as exhaust-fluid since it might contain liquid components or parts of the fluid might condense to a liquid.
- this exhaust-fluid is a burned fluid (thus exhaust in this respect) of the oxy-fuel- burner but also a medium for the steam cycle, it is also called working-media- stream in this document. All modifica- tions and processing of this working-media stream within the steam cycle will also be called working-media stream.
- Another beneficial improvement of the invention is given by providing at least one adjustable valve to control the flow through said recirculation line.
- This control feature allows maintaining the desired exhaust-fluid temperature downstream said oxy- fuel -burner (thus also called burner-discharge- fluid) respectively before said exhaust-fluid or working- media- stream enters any turbine equipment.
- a control unit controls the position of said adjustable valve in the recirculation line according to a temperature measurement upstream a turbine (i.e. steam turbine) of the power generation system.
- This control unit is designed such that it receives the measurement results from temperature measurement and submits control signals to said control valve.
- the control method preferably is designed such that the valve opens further when exceeding a temperature limit is recognized.
- valve control unit can be designed such that upper limits of temperature increases respectively steep temperature transients in a turbine of the power generation system are avoided.
- Another preferred embodiment provides a degasification port at said at least one feed water pre-heater to collect gaseous carbon-dioxide from the condensing exhaust-fluid.
- Another preferred embodiment of the invention provides an air separation unit upstream of said oxy- fuel -burner to preferably separate oxygen from ambient air to be burned with a fuel in said oxy- fuel -burner .
- This air separation unit can be of a membrane type .
- figure 1 shows a schematic flow diagram of an oxy fuel power plant comprising the arrangement according to the invention and depicting the method according to the invention.
- FIG. 1 is a schematic depiction of a simplified flow diagram showing a power generation system and illustrating a method according to the invention.
- Fuel F and oxygen 0 2 from an air separation unit ASU are both elevated to a higher pressure level by compressors CI, C2 , C3 , C4 , C5 which compressors CI, C2 , C3 , C4 , C5 are respectively provided with intercoolers INT1, INT2 , INT3 before both fluids are injected in an oxy- fuel -burner OXB at a pressure of for example
- exhaust-fluid first burner-discharge- fluid .
- This exhaust-fluid will be modified as explained in the paragraph below and converted to a first working-media- stream EXH1 - and exits said oxy- fuel -burner OXB and enters a first heat exchanger HEX1 (wherein the first working-media- stream EXH1 heats a second medium) .
- the temperature of said first working-media- stream EXH1 is adjusted by controlling a flow of evaporating media - particularly water as medium - as recirculating stream to the oxy- fuel -burner OXB to be boiled off and thus cool the first burner-discharge- fluid to the right temperature (resulting in the first working-media- stream EXH1 then) to subsequently en- ter a second steam turbine ST2.
- said first working- media- stream EXH1 is expanded in said second steam turbine ST2 , which is a high pressure steam turbine (high pressure means that this pressure level is higher than the pressure level of the downstream turbine - a first steam turbine ST1) .
- the first working-media- stream EXHl exiting said second steam turbine ST2 is divided in a second exhaust-fluid-stream or second working-media- stream EXH2 and a third exhaust-fluid- stream or third working-media- stream EXH3 , wherein preferably approximately above 90% of said first working-media- stream EXHl becomes said third exhaust-fluid-stream EXH3.
- said third working- media- stream EXH3 enters said first heat exchanger HEXl to be reheated taking thermal energy from said first exhaust-fluid- stream EXHl coming from said oxy- fuel -burner OXB .
- the presence of the second steam turbine ST2 and the first heat exchanger HEXl may be optional .
- said third working-media- stream EXH3 enters a first steam turbine ST1 to be expanded from approximately 40 bar pressure down to a pressure of 0.2 bar.
- the pressure values are meant as examples.
- Said first turbine ST1 comprises several extractions of fluid streams so that said expanded third working-media- stream EXH3 is reduced to a seventh exhaust-fluid-stream or seventh working-media- stream EXH7 by extraction of a fourth exhaust-fluid-stream or fourth working-media- stream EXH4 , extraction of a fifth exhaust- fluid-stream or fifth working-media- stream EXH5 and extraction of a sixth exhaust-fluid-stream or sixth working-media- stream EXH6.
- said seventh working-media- stream EXH7 is partly liquefied in a first condenser C0N1 (or more generally, in a water separa- tor) , which is equipped with a degasifier to separate said seventh working-media- stream EXH7 into a gaseous eighth exhaust-fluid-stream or eighth working-media- stream EXH8 and a liquid ninth exhaust-fluid-stream or ninth working-media- stream EXH9 both exiting said first condenser C0N1.
- Said eighth working-media- stream EXH8 is basically gaseous carbon- dioxide and further downstream compressed in an intercooled multistage compressor MCP consisting of the stages CP1, CP2 , CP3 and the intercooling heat exchangers INT3 , INT4.
- Said multistage compressor MCP may receive further gaseous streams of carbon-dioxide at several intermediate pressure levels of compression to be compressed for subsequent usage, here indicated as storage STO.
- said ninth working-media- stream EXH9 Downstream said first condensers C0N1 said ninth working- media- stream EXH9 it delivered to a higher pressure level by a first feed water pump FWP1, which has again an output of a feed-water-pump-output-stream.
- said ninth working-media- stream EXH9 More precisely: said feed-water-pump-output-stream - is split into a tenth exhaust-fluid-stream or tenth working-media- stream or extraction- fluid- stream EXH10 - which basically consists of liquid water H 2 0 - and an eleventh exhaust-fluid- stream or eleventh working-media- stream EXHll, which enters a downstream mixing pre-heater and degasifier MPD .
- said eleventh working- media-stream EXHll mixes with said sixth working-media- stream EXH6 extracted from said first steam turbine ST1 to increase the temperature and further mixes with a 22nd exhaust-fluid- stream or 22nd working-media- stream EXH22, which is throttled by a valve TH3 into said mixing pre-heater and degasifier MPD.
- the gaseous amount generated in said mixing pre-heater and degasifier MPD is directed to said multistage compressor MCP as a twelfth exhaust-fluid-stream or twelfth working- media-stream EXH12.
- the liquid amount from said mixing pre- heater and degasifier MPD is delivered to a downstream second feed-water-pump FWP2 as a thirteenth exhaust-fluid-stream or thirteenth working-media- stream EXH13. Further downstream said thirteenth working-media- stream EXH13 is heated-up in a second sub-cooler SC02 exchanging heat with said 22th working-media-stream EXH22 before the latter enters said mixing pre-heater and degasifier MPD.
- said thir- teenth working-media- stream EXH13 enters in the following order a first feed water pre-heater WPH1, a first (optional) sub-cooler SCOl, a second (optional) feed water pre-heater WPH2 , a third (optional) heat exchanger HEX3 and a third (op- tional) feed water pre-heater WPH3 and a second (optional) heat exchanger HEX2.
- division point DIV1 can be posi- tioned also at other positions in the cycle.
- said thirteenth working- media-stream EXH13 joins or leads into said recirculation line RCL through an adjustable valve WSV to be injected into said oxy- fuel -burner OXB to adjust the temperature of said first working-media- stream EXH1 as said above mentioned cooling media.
- Said third feed water pre-heater WPH3 is heated by said se- cond working-media- stream EXH2 extracted from said second steam turbine ST2 downstream passing said second heat exchanger HEX2 transferring thermal energy to said thirteenth working-media- stream EXH13.
- Said third feed water pre-heater WPH3 splits the hot side of this heat exchange into a gaseous component supplied to the multistage compressor MCP as an eighteenth exhaust-fluid-stream or eighteenth working-media- stream EXH18.
- the liquid component of the hot side of the third feed water pre-heater WPH3 is provided as a heating fluid through a first throttle TH1 into said second feed wa- ter pre-heater WPH2 as 20 th exhaust-fluid-stream or 20 th working-media-stream EXH20.
- Said second feed water pre-heater WPH2 subsequently receives said fourth working-media- stream EXH4 from said first steam turbine ST1 to heat-up said thirteenth working-media- stream EXH13.
- Said second feed water pre-heater WPH2 discharges a gaseous sixteenth exhaust-fluid-stream or sixteenth working-media- stream EXH16 - consisting basically of carbon-dioxide - and a liquid 21st exhaust-fluid-stream or 21st working-media- stream EXH21 both resulting from said incoming fourth working-media- stream EXH4 and said 20 th working-media- stream EXH20.
- Said 21st working-media- stream EXH21 enters the heating side of said first sub-cooler SCOl and further downstream enters said first feed water pre-heater WPHl through a second throttle valve TH2 on the heating side.
- said first feed water pre-heater WPHl receives said fifth working-media- stream EXH5 from said first steam turbine ST1 to heat-up said thirteenth working- media-stream EXH13.
- said first feed water pre-heater WPHl discharges a gaseous fourteenth exhaust-fluid-stream or fourteenth working-media-stream EXH14 - consisting basically of carbon- dioxide - and the liquid 22nd working-media- stream EXH22 both resulting from said incoming fifth working-media- stream EXH5 and said 21st working-media- stream EXH21.
- Said 22nd working- media- stream EXH22 enters the heating side of said second sub-cooler SC02 and further downstream enters said said mixing pre-heater and degasifier MPD through said third throttle valve TH3 on the heating side.
- Said first steam turbine ST1 and said second steam turbine ST2 both drive at least one generator GEN to produce electrical power.
- a direct drive can be provided for example for a compressor or any other unit to be driven.
- Said first condenser C0N1 can be cooled by ambient air, ambient water from a sea or a river or it can be a water spray condenser cooling the fluid to be condensed by water jet.
- Wa- ter can be provided by for example water extracted from said power generation system cooled and re- injected.
- a water treatment WT can be inserted for example in said recir- culation line RCL or at another location in the cycle.
- another water treatment WT can be inserted upstream of the extraction of water H 2 0 as the tenth extraction-fluid-stream EXH10. This location would also improve the quality of water to be extracted for any potential subsequent usage.
- the steam cycle RC is operated with the working-media- streams EXH1, EXH7 , EXH9 , EXH11, EXH13.
- New fluid is provided via the first working-media- streams EXH1, some of the fluid is also extracted from the cycle, e.g. working-media- streams EXH8, EXH12 , EXH14 , EXH16 , EXH18.
- the separation of carbon dioxide (C02) from the first feed water pre-heater WPH1 (or the other feed water pre-heaters WPH2 , WPH3) may differentiate from known feed water preheaters found in other steam cycles, since the magnitude of gas to be separated may be substantial, many percent of the steam turbine extraction flow (here: EXH2 or EXH4 or EXH5) , whereas in known condensers just some ppb (part per billion) levels are separated during normal operation.
- a power generation system PGS comprising
- oxy- fuel -burner OXB an oxy- fuel -burner OXB, wherein said oxy- fuel -burner OXB is made to generate a first burner-discharge- fluid from burning fuel F with an oxygen containing gas 02, said oxygen contain- ing gas 02 having oxygen content which is higher than the oxygen content of ambient air,
- a recirculation line RCL for feeding a first liquid, particularly water, into said oxy- fuel -burner OXB to mix with said generated first burner-discharge-fluid to a first work- ing-media- stream EXH1,
- a steam cycle RC operated with said first working-media- stream EXH1, - wherein said steam cycle RC comprises at least one first steam turbine STl expanding at least a part of said first working-media- stream EXH1, namely a third working-media- stream EXH3 , wherein said first steam turbine STl has at least one output port for expanded fluid, one of which providing a seventh working-media- stream EXH7,
- said steam cycle RC comprises at least one first water separator CONl, particularly a condenser, downstream said first steam turbine STl condensing part of said seventh working-media- stream EXH7, wherein said first water separator CONl has at least one output port for condensed fluid, one of which providing a ninth working-media- stream EXH9,
- said steam cycle RC comprises at least one first feed-water-pump FWP1 downstream of said first water separa- tor CONl delivering said ninth working-media- stream EXH9 to a higher pressure level, with an output of a feed-water-pump- output-stream,
- said steam cycle RC comprises at least one first feed-water pre-heater WPH1 downstream said first feed-water-pump FWP1 heating at least a part of said feed-water-pump-output- stream, namely a thirteenth working-media- stream EXH13,
- said first water separator CONl further extracts carbon- dioxide from said seventh working-media- stream EXH7 via a further output port of said first water separator CONl as an eighth carbon-dioxide- stream EXH8,
- one of said output ports of said first steam turbine STl provides a fifth working-media- stream EXH5 and wherein said at least one first feed water-pre-heater WPH1 is heated via said fifth working-media- stream EXH5.
- PGS power generation system
- a steam cycle RC comprising at least one first steam turbine ST1, at least one first water separator CONl, particularly a condenser, downstream said first steam turbine ST1, at least one first feed-water-pump FWP1 downstream said first water separator CONl, at least one first feed-water- preheater WPH1 downstream said first feed-water-pump FWP1,
- said tenth extraction- fluid- stream EXH10 being particularly water
- Power generation system comprising
- a recirculation line extracting a part of said exhaust-fluid from said steam cycle (RC) and feeding said exhaust-fluid-stream into said oxy- fuel -burner (OXB) to mix with said continuously generated exhaust-fluid
- said steam cycle (RC) comprises at least one first steam turbine (ST1) expanding at least a part of said exhaust-fluid, namely a third exhaust-fluid-stream (EXH3), - wherein said steam cycle (RC) comprises at least one first condenser (CON1) downstream said first steam turbine (ST1) condensing at least a part of said third exhaust-fluid-stream (EXH3), namely a seventh exhaust-fluid-stream (EXH7) ,
- said steam cycle (RC) comprises at least one first feed-water-pump (FWP1) downstream of said first condenser (CON1) delivering at least a part of said seventh exhaust- fluid- stream (EXH7) to a higher pressure level, namely a ninth exhaust-fluid-stream (EXH9)
- said steam cycle (RC) comprises at least one first feed- water-preheater (WPH1) downstream said first feed-water-pump (FWP1) heating at least a part of said seventh exhaust-fluid- stream (EXH7) , namely a thirteenth exhaust-fluid-stream
- said at least one first feed water-preheater (WPH1) is heated with an exhaust-fluid-stream extracted from said first steam turbine (ST1) , namely a fifth exhaust-fluid- stream (EXH5) .
- PGS power generation system
- RC steam cycle
- ST1 first steam turbine
- C0N1 first condenser
- WP1 first feed-water-pump
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Abstract
A power generation system (PGS) comprising an oxy-fuel-burner (OXB), a steam cycle (RC), a recirculation line (RCL) for feeding a part of working media of said steam cycle into said oxy-fuel-burner (OXB). To improve efficiency a system and a method is proposed • - providing at least one first feed-water-preheater (WPH1) and • - wherein said steam cycle (RC) joins into said recirculation line (RCL) downstream said at least one first feed water preheater (WPH1) and • - extracting a tenth working-media-stream (EXH10) from said steam cycle (RC), • - extracting an eighth working-media-stream (EXH8) as carbon-dioxide downstream said first condenser (CON1), • - wherein said at least one first feed water-preheater (WPH1) is heated with a working media stream extracted from said first steam turbine (ST1), namely a fifth working-media-stream (EXH5).
Description
Description
Power generation system and method to operate The invention relates to a power generation system comprising an oxy- fuel -burner and a steam cycle.
Power generation systems and respective methods to operate such systems are known for a long time since mechanical power or electrical power is generated especially by burning a fuel with an oxygen containing gas. Recently concerns came up about carbon-dioxide content in air increasing up to an amount where a so called green-house effect might occur.
Since such awareness is rising several projects are initiated to reduce the emission of carbon-dioxide. One of those projects is burning a fuel with an oxygen containing gas other than air to a avoid the generation of NOx (nitrogen oxides) and to avoid the mixing of essential inert components with the carbon-dioxide generated during combustion to more easily enable the separation of carbon-dioxide from the exhaust gas generated. This easy separation simplifies storage of pure carbon-dioxide in a final storage capacity. Essentially pure carbon-dioxide can further better be used for subsequent chemical processes. The oxygen containing gas is basically pure oxygen with minor impurities generated by for example an air separation unit, which can be of conventional membrane type. In the context of this invention an oxy- fuel -burner is characterized by burning basically a fuel with an oxygen containing gas wherein said oxygen containing gas has signifi- cant higher oxygen content than ambient air or wherein oxygen is its main component or wherein said oxygen containing gas is preferably pure oxygen with some impurities. This oxygen containing gas may contain some further additives but its main component is preferably oxygen.
One known power generation system is disclosed in
US 7,021,063 B2 , which deals with an oxy- fuel -burner respectively gas generator comprising a recuperative heat exchanger
for reheating of steam that has passed a first expansion machine stage, which heat exchanger is heated by outlet steam respectively exhaust from said gas generator. The total efficiency of a conventional power generation system with an oxy- fuel -burner is significantly below the efficiency of an ordinary power generation system if the energy consumption of the air separation unit is considered. The efficiency is therefore to be improved to make this technology economically feasible and to have a positive effect on the environment .
It is one object of the invention to improve the efficiency of the known power generation system comprising an oxy- fuel - burner.
The object of enhancing the efficiency of the incipiently defined power generation system is achieved by a power generation system according to the incipiently mentioned type with the further features of the characterizing portion of claim 1. Further the object is achieved by a method of the incipiently mentioned type with the further features of the characterizing portion of the independent method claim. One essential aspect of the proposed improvement of the power generation system respectively the method according to the invention is the addition of heat exchangers for preheating of the re-circulated feed water submitted to the oxy-fuel- burner for mixing into exhaust stream of the oxy- fuel -burner (being a working media for a steam cycle) . According to the invention by preheating with extraction steam the cycle performance is improved.
In the cycle according to the invention the steam respective- ly working media (substantially exhaust-fluid of the oxy- fuel-burner) taken from the steam turbine (s) contains carbon- dioxide in a substantial concentration, typically more than 5%, preferably about 10% by volume, which makes the cycle
much different from a conventional steam cycle. The carbon- dioxide led to the pre-heaters is preferably separated from the pre-heaters and then collected to be routed to an export carbon-dioxide stream. Preferably a carbon-dioxide compres- sion process for the delivery to a final user - for example enhanced oil recovery or methane synthesis - is integrated in the power generation system respectively method.
A further beneficial improvement of the process according to the invention is obtained by providing a recuperator respectively first heat exchanger downstream said oxy- fuel -burner before the exhaust-fluid of the oxy- fuel -burner (a first working-media- stream) enters a steam turbine. This heat exchanger respectively recuperator re-heats steam respectively the first working-media- stream that has passed a first expansion through said steam turbine, wherein the exhaust-fluid from said oxy- fuel -burner is heating a working-media- stream from said steam turbine. This heat exchanger provides a certain protection for the downstream steam turbine as it pro- vides some heat capacity damping thermal gradients from upstream equipment control variations or disturbances. Further this heat exchanger assist in protecting the turbine from possible water droplets carried over from said oxy-fuel- burner .
Said oxy- fuel -burner according to the invention is basically a gas generator generating an exhaust gas respectively exhaust fluid from a fuel burned or combusted with essentially pure oxygen. This exhaust gas is referred to as exhaust-fluid since it might contain liquid components or parts of the fluid might condense to a liquid. As this exhaust-fluid is a burned fluid (thus exhaust in this respect) of the oxy-fuel- burner but also a medium for the steam cycle, it is also called working-media- stream in this document. All modifica- tions and processing of this working-media stream within the steam cycle will also be called working-media stream.
Another beneficial improvement of the invention is given by providing at least one adjustable valve to control the flow through said recirculation line. This control feature allows maintaining the desired exhaust-fluid temperature downstream said oxy- fuel -burner (thus also called burner-discharge- fluid) respectively before said exhaust-fluid or working- media- stream enters any turbine equipment. Preferably a control unit controls the position of said adjustable valve in the recirculation line according to a temperature measurement upstream a turbine (i.e. steam turbine) of the power generation system. This control unit is designed such that it receives the measurement results from temperature measurement and submits control signals to said control valve. The control method preferably is designed such that the valve opens further when exceeding a temperature limit is recognized.
Further the valve control unit can be designed such that upper limits of temperature increases respectively steep temperature transients in a turbine of the power generation system are avoided.
Another preferred embodiment provides a degasification port at said at least one feed water pre-heater to collect gaseous carbon-dioxide from the condensing exhaust-fluid. Another preferred embodiment of the invention provides an air separation unit upstream of said oxy- fuel -burner to preferably separate oxygen from ambient air to be burned with a fuel in said oxy- fuel -burner . This air separation unit can be of a membrane type .
The above mentioned attributes and other features and advantageous of this invention and the manner of attaining them will become more apparent and the invention itself will be understood by reference to the following description of the currently known best mode of carrying out the invention taken in conjunction with the accompanying drawings, wherein
figure 1 shows a schematic flow diagram of an oxy fuel power plant comprising the arrangement according to the invention and depicting the method according to the invention.
Figure 1 is a schematic depiction of a simplified flow diagram showing a power generation system and illustrating a method according to the invention. Fuel F and oxygen 02 from an air separation unit ASU are both elevated to a higher pressure level by compressors CI, C2 , C3 , C4 , C5 which compressors CI, C2 , C3 , C4 , C5 are respectively provided with intercoolers INT1, INT2 , INT3 before both fluids are injected in an oxy- fuel -burner OXB at a pressure of for example
150 bar. In said oxy- fuel -burner OXB - which can also be con- sidered as a gas generator - combustion takes place of said fuel F with said oxygen 02 generating exhaust gas hereinafter referred to as exhaust-fluid or first burner-discharge- fluid . This exhaust-fluid will be modified as explained in the paragraph below and converted to a first working-media- stream EXH1 - and exits said oxy- fuel -burner OXB and enters a first heat exchanger HEX1 (wherein the first working-media- stream EXH1 heats a second medium) .
The temperature of said first working-media- stream EXH1 is adjusted by controlling a flow of evaporating media - particularly water as medium - as recirculating stream to the oxy- fuel -burner OXB to be boiled off and thus cool the first burner-discharge- fluid to the right temperature (resulting in the first working-media- stream EXH1 then) to subsequently en- ter a second steam turbine ST2.
Downstream said first exchanger HEX1 said first working- media- stream EXH1 is expanded in said second steam turbine ST2 , which is a high pressure steam turbine (high pressure means that this pressure level is higher than the pressure level of the downstream turbine - a first steam turbine ST1) .
The first working-media- stream EXHl exiting said second steam turbine ST2 is divided in a second exhaust-fluid-stream or second working-media- stream EXH2 and a third exhaust-fluid- stream or third working-media- stream EXH3 , wherein preferably approximately above 90% of said first working-media- stream EXHl becomes said third exhaust-fluid-stream EXH3.
Downstream said second steam turbine ST2 said third working- media- stream EXH3 enters said first heat exchanger HEXl to be reheated taking thermal energy from said first exhaust-fluid- stream EXHl coming from said oxy- fuel -burner OXB .
The presence of the second steam turbine ST2 and the first heat exchanger HEXl may be optional .
Further downstream said third working-media- stream EXH3 enters a first steam turbine ST1 to be expanded from approximately 40 bar pressure down to a pressure of 0.2 bar. The pressure values are meant as examples. Said first turbine ST1 comprises several extractions of fluid streams so that said expanded third working-media- stream EXH3 is reduced to a seventh exhaust-fluid-stream or seventh working-media- stream EXH7 by extraction of a fourth exhaust-fluid-stream or fourth working-media- stream EXH4 , extraction of a fifth exhaust- fluid-stream or fifth working-media- stream EXH5 and extraction of a sixth exhaust-fluid-stream or sixth working-media- stream EXH6. Downstream said first steam turbine ST1 said seventh working-media- stream EXH7 is partly liquefied in a first condenser C0N1 (or more generally, in a water separa- tor) , which is equipped with a degasifier to separate said seventh working-media- stream EXH7 into a gaseous eighth exhaust-fluid-stream or eighth working-media- stream EXH8 and a liquid ninth exhaust-fluid-stream or ninth working-media- stream EXH9 both exiting said first condenser C0N1. Said eighth working-media- stream EXH8 is basically gaseous carbon- dioxide and further downstream compressed in an intercooled multistage compressor MCP consisting of the stages CP1, CP2 , CP3 and the intercooling heat exchangers INT3 , INT4. Said
multistage compressor MCP may receive further gaseous streams of carbon-dioxide at several intermediate pressure levels of compression to be compressed for subsequent usage, here indicated as storage STO.
Downstream said first condensers C0N1 said ninth working- media- stream EXH9 it delivered to a higher pressure level by a first feed water pump FWP1, which has again an output of a feed-water-pump-output-stream. At a downstream division point DIV1 (which can be located at many different positions in the cycle, though) said ninth working-media- stream EXH9 - more precisely: said feed-water-pump-output-stream - is split into a tenth exhaust-fluid-stream or tenth working-media- stream or extraction- fluid- stream EXH10 - which basically consists of liquid water H20 - and an eleventh exhaust-fluid- stream or eleventh working-media- stream EXHll, which enters a downstream mixing pre-heater and degasifier MPD . In said mixing pre-heater and degasifier MPD said eleventh working- media-stream EXHll mixes with said sixth working-media- stream EXH6 extracted from said first steam turbine ST1 to increase the temperature and further mixes with a 22nd exhaust-fluid- stream or 22nd working-media- stream EXH22, which is throttled by a valve TH3 into said mixing pre-heater and degasifier MPD. The gaseous amount generated in said mixing pre-heater and degasifier MPD is directed to said multistage compressor MCP as a twelfth exhaust-fluid-stream or twelfth working- media-stream EXH12. The liquid amount from said mixing pre- heater and degasifier MPD is delivered to a downstream second feed-water-pump FWP2 as a thirteenth exhaust-fluid-stream or thirteenth working-media- stream EXH13. Further downstream said thirteenth working-media- stream EXH13 is heated-up in a second sub-cooler SC02 exchanging heat with said 22th working-media-stream EXH22 before the latter enters said mixing pre-heater and degasifier MPD. Further downstream said thir- teenth working-media- stream EXH13 enters in the following order a first feed water pre-heater WPH1, a first (optional) sub-cooler SCOl, a second (optional) feed water pre-heater WPH2 , a third (optional) heat exchanger HEX3 and a third (op-
tional) feed water pre-heater WPH3 and a second (optional) heat exchanger HEX2.
As already indicated the division point DIV1 can be posi- tioned also at other positions in the cycle.
Downstream this pre-heating sequence said thirteenth working- media-stream EXH13 joins or leads into said recirculation line RCL through an adjustable valve WSV to be injected into said oxy- fuel -burner OXB to adjust the temperature of said first working-media- stream EXH1 as said above mentioned cooling media.
Said third feed water pre-heater WPH3 is heated by said se- cond working-media- stream EXH2 extracted from said second steam turbine ST2 downstream passing said second heat exchanger HEX2 transferring thermal energy to said thirteenth working-media- stream EXH13. Said third feed water pre-heater WPH3 splits the hot side of this heat exchange into a gaseous component supplied to the multistage compressor MCP as an eighteenth exhaust-fluid-stream or eighteenth working-media- stream EXH18. The liquid component of the hot side of the third feed water pre-heater WPH3 is provided as a heating fluid through a first throttle TH1 into said second feed wa- ter pre-heater WPH2 as 20th exhaust-fluid-stream or 20th working-media-stream EXH20.
Said second feed water pre-heater WPH2 subsequently receives said fourth working-media- stream EXH4 from said first steam turbine ST1 to heat-up said thirteenth working-media- stream EXH13.
Said second feed water pre-heater WPH2 discharges a gaseous sixteenth exhaust-fluid-stream or sixteenth working-media- stream EXH16 - consisting basically of carbon-dioxide - and a liquid 21st exhaust-fluid-stream or 21st working-media- stream EXH21 both resulting from said incoming fourth working-media- stream EXH4 and said 20th working-media- stream EXH20. Said
21st working-media- stream EXH21 enters the heating side of said first sub-cooler SCOl and further downstream enters said first feed water pre-heater WPHl through a second throttle valve TH2 on the heating side.
Partly already explained, said first feed water pre-heater WPHl receives said fifth working-media- stream EXH5 from said first steam turbine ST1 to heat-up said thirteenth working- media-stream EXH13.
Further, said first feed water pre-heater WPHl discharges a gaseous fourteenth exhaust-fluid-stream or fourteenth working-media-stream EXH14 - consisting basically of carbon- dioxide - and the liquid 22nd working-media- stream EXH22 both resulting from said incoming fifth working-media- stream EXH5 and said 21st working-media- stream EXH21. Said 22nd working- media- stream EXH22 enters the heating side of said second sub-cooler SC02 and further downstream enters said said mixing pre-heater and degasifier MPD through said third throttle valve TH3 on the heating side.
Said first steam turbine ST1 and said second steam turbine ST2 both drive at least one generator GEN to produce electrical power. As an alternative a direct drive can be provided for example for a compressor or any other unit to be driven.
Said first condenser C0N1 can be cooled by ambient air, ambient water from a sea or a river or it can be a water spray condenser cooling the fluid to be condensed by water jet. Wa- ter can be provided by for example water extracted from said power generation system cooled and re- injected.
To prevent accumulation of undesired products in the cycle a water treatment WT can be inserted for example in said recir- culation line RCL or at another location in the cycle. Alternatively or in addition (as shown in the figure) another water treatment WT can be inserted upstream of the extraction of water H20 as the tenth extraction-fluid-stream EXH10. This
location would also improve the quality of water to be extracted for any potential subsequent usage.
It has to be noted that the extraction-fluid-stream EXH10 could be extracted at a lot of different positions in the cycle .
The steam cycle RC is operated with the working-media- streams EXH1, EXH7 , EXH9 , EXH11, EXH13. New fluid is provided via the first working-media- streams EXH1, some of the fluid is also extracted from the cycle, e.g. working-media- streams EXH8, EXH12 , EXH14 , EXH16 , EXH18.
In an embodiment, the separation of carbon dioxide (C02) from the first feed water pre-heater WPH1 (or the other feed water pre-heaters WPH2 , WPH3) may differentiate from known feed water preheaters found in other steam cycles, since the magnitude of gas to be separated may be substantial, many percent of the steam turbine extraction flow (here: EXH2 or EXH4 or EXH5) , whereas in known condensers just some ppb (part per billion) levels are separated during normal operation.
Some of the features as explained in the embodiment above are optional. The following setup is sufficient:
A power generation system PGS comprising
- an oxy- fuel -burner OXB, wherein said oxy- fuel -burner OXB is made to generate a first burner-discharge- fluid from burning fuel F with an oxygen containing gas 02, said oxygen contain- ing gas 02 having oxygen content which is higher than the oxygen content of ambient air,
- a recirculation line RCL for feeding a first liquid, particularly water, into said oxy- fuel -burner OXB to mix with said generated first burner-discharge-fluid to a first work- ing-media- stream EXH1,
- a steam cycle RC operated with said first working-media- stream EXH1,
- wherein said steam cycle RC comprises at least one first steam turbine STl expanding at least a part of said first working-media- stream EXH1, namely a third working-media- stream EXH3 , wherein said first steam turbine STl has at least one output port for expanded fluid, one of which providing a seventh working-media- stream EXH7,
- wherein said steam cycle RC comprises at least one first water separator CONl, particularly a condenser, downstream said first steam turbine STl condensing part of said seventh working-media- stream EXH7, wherein said first water separator CONl has at least one output port for condensed fluid, one of which providing a ninth working-media- stream EXH9,
- wherein said steam cycle RC comprises at least one first feed-water-pump FWP1 downstream of said first water separa- tor CONl delivering said ninth working-media- stream EXH9 to a higher pressure level, with an output of a feed-water-pump- output-stream,
wherein,
said steam cycle RC comprises at least one first feed-water pre-heater WPH1 downstream said first feed-water-pump FWP1 heating at least a part of said feed-water-pump-output- stream, namely a thirteenth working-media- stream EXH13,
- wherein said steam cycle RC leads into said recirculation line RCL downstream said at least one first feed water pre- heater WPH1 feeding said thirteenth working-media- stream EXH13 into said recirculation line RCL as said first liquid,
- wherein a part of working media in said steam cycle RC is extracted from said steam cycle RC, particularly downstream said first feed-water-pump FWP1, as a tenth extraction- fluid- stream EXH10, said tenth extraction- fluid- stream EXH10 being particularly water,
- said first water separator CONl further extracts carbon- dioxide from said seventh working-media- stream EXH7 via a further output port of said first water separator CONl as an eighth carbon-dioxide- stream EXH8,
- wherein one of said output ports of said first steam turbine STl provides a fifth working-media- stream EXH5 and
wherein said at least one first feed water-pre-heater WPH1 is heated via said fifth working-media- stream EXH5.
The following method steps will be performed for such a sys- tern:
Method to operate a power generation system (PGS) defined by the following steps:
- generating a first burner-discharge- fluid from burning an oxygen containing gas (02) and fuel (F) ,
- wherein an oxygen content of said oxygen containing gas (02) is higher than the oxygen content of ambient air,
- providing a steam cycle RC comprising at least one first steam turbine ST1, at least one first water separator CONl, particularly a condenser, downstream said first steam turbine ST1, at least one first feed-water-pump FWP1 downstream said first water separator CONl, at least one first feed-water- preheater WPH1 downstream said first feed-water-pump FWP1,
- extracting a part of working media from said steam cycle RC by a recirculation line RCL and feeding a first liquid, particularly water, as said part of said working media into said oxy- fuel -burner OXB to mix with said generated first burner- discharge- fluid to result in a first working-media- stream EXH1,
- operating said steam cycle RC with said first working- media- stream EXH1,
- expanding at least a part of said first working-media- stream EXH1, namely a third working-media- stream EXH3 by said at least one first steam turbine ST1,
- condensing at least a part of said expanded third working- media- stream EXH3 , namely a seventh working-media- stream EXH7, by said at least one first water separator CONl,
- delivering at least a part of said seventh working-media- stream EXH7 downstream of said first water separator CONl to a higher pressure level, namely a ninth working-media- stream EXH9, by said at least one first feed-water-pump FWP1, and outputting a feed-water-pump-output-stream by said at least one first feed-water-pump FWP1,
- heating at least a part of said feed-water-pump-output- stream, namely a thirteenth working-media- stream EXH13 by at least one first feed-water-preheater WPH1,
- feeding at least a part of said thirteenth working-media- stream EXH13 from said steam cycle RC as said first liquid into said recirculation line RCL downstream said at least one first feed water pre-heater WPH1,
- extracting a part of working media of said steam cycle RC from said steam cycle RC, particularly downstream said first feed-water-pump FWP1, as a tenth extraction-fluid-stream
EXH10, said tenth extraction- fluid- stream EXH10 being particularly water,
- extracting a part of said seventh exhaust-fluid-stream EXH7 as carbon-dioxide downstream said first water separator CONl, namely an eighth carbon-dioxide- stream EXH8,
- heating said at least one first feed water-preheater WPH1 by an output-stream extracted from said first steam turbine ST1, namely a fifth working-media- stream EXH5. Just in slightly different wording, the previously explained system and method are substantially equivalent to the following system and method (identical or similar elements are identified by the same reference numberals) : Power generation system comprising
- an oxy- fuel -burner (OXB) , wherein said oxy- fuel -burner (OXB) is made to generate exhaust-fluid from burning fuel (F) with an oxygen containing gas (02), which' s oxygen content is higher than the oxygen con-tent of ambient air,
- a steam cycle (RC) operated with said exhaust-fluid generated by said oxy- fuel -burner (OXB) ,
- a recirculation line (RCL) extracting a part of said exhaust-fluid from said steam cycle (RC) and feeding said exhaust-fluid-stream into said oxy- fuel -burner (OXB) to mix with said continuously generated exhaust-fluid,
- wherein said steam cycle (RC) comprises at least one first steam turbine (ST1) expanding at least a part of said exhaust-fluid, namely a third exhaust-fluid-stream (EXH3),
- wherein said steam cycle (RC) comprises at least one first condenser (CON1) downstream said first steam turbine (ST1) condensing at least a part of said third exhaust-fluid-stream (EXH3), namely a seventh exhaust-fluid-stream (EXH7) ,
- wherein said steam cycle (RC) comprises at least one first feed-water-pump (FWP1) downstream of said first condenser (CON1) delivering at least a part of said seventh exhaust- fluid- stream (EXH7) to a higher pressure level, namely a ninth exhaust-fluid-stream (EXH9)
wherein,
said steam cycle (RC) comprises at least one first feed- water-preheater (WPH1) downstream said first feed-water-pump (FWP1) heating at least a part of said seventh exhaust-fluid- stream (EXH7) , namely a thirteenth exhaust-fluid-stream
(EXH13) ,
- wherein said steam cycle (RC) joins into said recirculation line (RCL) downstream said at least one first feed water pre- heater (WPH1) feeding at least a part of said thirteenth exhaust-fluid-stream (EXH13) into said recirculation line
(RCL) , namely a nineteenth exhaust-fluid-stream (EXH19) ,
- wherein a part of said ninth exhaust-fluid-stream (EXH9) is extracted from said steam cycle (RC) downstream said first feed-water-pump (FWP1) as a tenth exhaust-fluid-stream
(EXH10) ,
- wherein a part of said seventh exhaust-fluid-stream (EXH8) is extracted as carbon-dioxide downstream said first condenser (CON1) , namely an eighth exhaust-fluid-stream (EXH8) ,
- wherein said at least one first feed water-preheater (WPH1) is heated with an exhaust-fluid-stream extracted from said first steam turbine (ST1) , namely a fifth exhaust-fluid- stream (EXH5) .
The corresponding method will be executed on such a system: Method to operate a power generation system (PGS) defined by the following steps:
- generating exhaust-fluid from burning an oxygen containing gas (02) and fuel (F) ,
- wherein an oxygen content of said oxygen containing gas (02) is higher than the oxygen content of ambient air,
- providing a steam cycle (RC) comprising at least one first steam turbine (ST1) , at least one first condenser (C0N1) downstream said first steam turbine (ST1) , at least one first feed-water-pump (FWP1) downstream said first condenser
(C0N1) , at least one first feed-water-preheater (WPH1) downstream said first feed-water-pump (FWP1) ,
- operating said steam cycle (RC) with said exhaust-fluid generated by said oxy- fuel -burner (OXB) ,
- extracting a part of said exhaust-fluid from said steam cycle (RC) by a recirculation line (RCL) and feeding said exhaust-fluid-stream into said oxy- fuel -burner (OXB) to mix with said continuously generated exhaust-fluid,
- expanding at least a part of said exhaust-fluid, namely a third exhaust-fluid-stream (EXH3) by said at least one first steam turbine (ST1) ,
- condensing at least a part of said third exhaust-fluid- stream (EXH3), namely a seventh exhaust-fluid-stream (EXH7) , by said at least one first conden-ser (C0N1) ,
- delivering at least a part of said seventh exhaust-fluid- stream (EXH7) downstream of said first conden-ser (C0N1) to a higher pressure level, namely a ninth exhaust-fluid-stream (EXH9) , by said at least one first feed-water-pump (FWP1) , - heating at least a part of said seventh exhaust-fluid- stream (EXH7) , namely a thirteenth exhaust-fluid-stream
(EXH13) by at least one first feed-water-preheater (WPH1) ,
- feeding at least a part of said thirteenth exhaust-fluid- stream (EXH13) from said steam cycle (RC) into said recircu- lation line (RCL) , namely a nineteenth exhaust-fluid-stream (EXH19) , downstream said at least one first feed water pre- heater (WPH1) ,
- extracting a part of said ninth exhaust-fluid-stream (EXH9) from said steam cycle (RC) downstream said first feed-water- pump (FWP1) as a tenth exhaust-fluid-stream (EXH10) ,
- extracting a part of said seventh exhaust-fluid-stream (EXH8) as carbon-dioxide downstream said first condenser (C0N1) , namely an eighth exhaust-fluid-stream (EXH8) ,
- heating said at least one first feed water-preheater (WPH1) by an exhaust-fluid-stream extracted from said first steam turbine (ST1) , namely a fifth exhaust-fluid-stream (EXH5) .
Claims
Patent claims
1. Power generation system (PGS) comprising
- an oxy- fuel -burner (OXB) , wherein said oxy- fuel - burner (OXB) is made to generate a first burner- discharge- fluid from burning fuel (F) with an oxygen containing gas (02) , said oxygen containing gas (02) having oxygen content which is higher than the oxygen content of ambient air,
- a recirculation line (RCL) for feeding a first liquid, particularly water, into said oxy- fuel -burner (OXB) to mix with said generated first burner-discharge- fluid to a first working-media- stream (EXH1) ,
- a steam cycle (RC) operated with said first working- media-stream (EXH1) ,
- wherein said steam cycle (RC) comprises at least one first steam turbine (ST1) expanding at least a part of said first working-media- stream (EXH1) , namely a third working-media- stream (EXH3), wherein said first steam turbine (ST1) has at least one output port for expanded fluid, one of which providing a seventh working-media- stream (EXH7) , - wherein said steam cycle (RC) comprises at least one first water separator (C0N1) , particularly a condenser, downstream said first steam turbine (ST1) condensing part of said seventh working-media- stream (EXH7) , wherein said first water separator (C0N1) has at least one output port for condensed fluid, one of which providing a ninth working-media- stream (EXH9) ,
- wherein said steam cycle (RC) comprises at least one first feed-water-pump (FWP1) downstream of said first water separator (C0N1) delivering said ninth working- media-stream (EXH9) to a higher pressure level, with an output of a feed-water-pump-output-stream,
characterized in that, said steam cycle (RC) comprises at least one first feed water pre-heater (WPH1) downstream said first feed- water-pump (FWP1) heating at least a part of said feed- water-pump-output-stream, namely a thirteenth working- media-stream (EXH13),
- wherein said steam cycle (RC) leads into said recircu lation line (RCL) downstream said at least one first feed water pre-heater (WPH1) feeding said thirteenth working-media- stream (EXH13) into said recirculation line (RCL) as said first liquid,
- wherein a part of working media in said steam cycle (RC) is extracted from said steam cycle (RC) , particularly downstream said first feed-water-pump (FWP1) , as a tenth extraction-fluid-stream (EXH10) , said tenth extraction- fluid- stream (EXH10) being particularly water,
- said first water separator (CON1) further extracts carbon-dioxide from said seventh working-media- stream (EXH7) via a further output port of said first water separator (CON1) as an eighth carbon-dioxide- stream (EXH8) ,
- wherein one of said output ports of said first steam turbine (ST1) provides a fifth working-media- stream (EXH5) and wherein said at least one first feed water-pre-heater (WPH1) is heated via said fifth working-media-stream (EXH5) .
Power generation system (PGS) according to claim 1, wherein a second steam turbine (ST2) is provided downstream of said oxy- fuel -burner (OXB) and upstream of said first steam turbine (ST1) receiving said first working-media- stream (EXH1) from said oxy- fuel-
burner (OXB)
Power generation system (PGS) according to claim 2, wherein a first heat exchanger (HEX1) , is provided downstream said oxy- fuel -burner (OXB) and upstream said second steam turbine (ST2) wherein at least a part of said first working-media- stream (EXH1) exiting said second steam turbine (ST2) , namely a third working-media- stream (EXH3) is heated up by said first heat exchanger (HEX1) receiving thermal energy from said first working-media- stream (EXH1) .
Power generation system (PGS) according to at least one of the preceding claims 1 to 3 ,
wherein said recirculation line (RCL) comprises at least one adjustable valve (WSV) to control the flow through said recirculation line (RCL) .
Power generation system (PGS) according to at least one of the preceding claims 1 to 4 ,
wherein said at least one first feed water-pre-heater (WPH1) comprises a degasification part to collect gaseous working media from the condensing of the provided said fifth working-media- stream (EXH5) .
Power generation system (PGS) according to at least one of the preceding claims,
wherein upstream said oxy- fuel -burner (OXB) is provided an air separation unit (ASU) as part of said power generation system (PGS) to provide pure oxygen from ambient air .
Method to operate a power generation system (PGS) defined by the following steps:
- generating a first burner-discharge- fluid from burning an oxygen containing gas (02) and fuel (F) ,
- wherein an oxygen content of said oxygen containing gas (02) is higher than the oxygen content of ambient
air,
- providing a steam cycle (RC) comprising at least one first steam turbine (ST1) , at least one first water separator (CON1) , particularly a condenser, downstream said first steam turbine (ST1) , at least one first feed- water-pump (FWP1) downstream said first water separator (CON1) , at least one first feed-water- preheater (WPH1) downstream said first feed-water- pump (FWP1) ,
- extracting a part of working media from said steam cycle (RC) by a recirculation line (RCL) and feeding a first liquid, particularly water, as said part of said working media into said oxy- fuel -burner (OXB) to mix with said generated first burner-discharge-fluid to re- suit in a first working-media- stream (EXH1) ,
- operating said steam cycle (RC) with said first working-media-stream (EXH1) ,
- expanding at least a part of said first working-media- stream (EXH1) , namely a third working-media- stream (EXH3) by said at least one first steam turbine (ST1) ,
- outputting a seventh working-media- stream (EXH7) from at least one output port for an expanded fluid of said first steam turbine (ST1) , the expanded fluid being a part of said third working-media- stream (EXH3),
- condensing a part of said seventh working-media- stream (EXH7) by said at least one first water separator (CON1) ,
- delivering at least a part of said seventh working- media-stream (EXH7) downstream of said first water separator (CON1) to a higher pressure level, namely a ninth working-media- stream (EXH9) , by said at least one first feed-water-pump (FWP1) , and outputting a feed-water- pump-output- stream by said at least one first feed- water-pump (FWP1) ,
characterized by the further steps:
- heating at least a part of said feed-water-pump- output-stream, namely a thirteenth working-media-
stream (EXH13) by at least one first feed-water- preheater (WPH1) ,
- feeding at least a part of said thirteenth working- media-stream (EXH13) from said steam cycle (RC) as said first liquid into said recirculation line (RCL) downstream said at least one first feed water pre- heater (WPH1) ,
- extracting a part of working media of said steam cycle (RC) from said steam cycle (RC) , particularly downstream said first feed-water-pump (FWP1) , as a tenth extraction-fluid-stream (EXH10) , said tenth extraction- fluid-stream (EXH10) being particularly water,
- extracting a part of said seventh exhaust-fluid- stream (EXH7) as carbon-dioxide downstream said first water separator (CON1) , namely an eighth carbon-dioxide- stream (EXH8) ,
- heating said at least one first feed water- preheater (WPH1) by an output-stream extracted from said first steam turbine (ST1) , namely a fifth working-media- stream (EXH5) .
Method according to claim 7 further comprising the step of
expanding received said first working-media- stream
(EXH1) from said oxy- fuel -burner (OXB) by a second steam turbine (ST2) downstream of said oxy- fuel -burner (OXB) and upstream of said first steam turbine (ST1) .
Method according to claim 7 or 8 further comprising the step of
heating up at least a part of said first working-media- stream (EXH1) exiting said second steam turbine (ST2), namely a third working-media- stream (EXH3) by a first heat exchanger (HEX1) receiving thermal energy from said first working-media- stream (EXH1) , said first heat exchanger (HEX1) being provided downstream said oxy- fuel - burner (OXB) and upstream said second steam turbine
(ST2)
Method according to claim 7, 8 or 9 further comprising the step of
controlling the flow through said recirculation line (RCL) by at least one adjustable valve (WSV) or pump or compressor.
11. Method according to at least one of the claims 7 - 10 further comprising the step of,
degasifying to collect gaseous working media from the condensing of the provided said fifth working-media- stream (EXH5) .
Method according to at least one of the claims 7 - 11 further comprising the step of,
providing an air separation unit (ASU) as part of said power generation system (PGS) to provide pure oxygen from ambient air upstream said oxy- fuel -burner (OXB) .
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016503676A JP2016519239A (en) | 2013-03-21 | 2014-03-21 | Power generation system and operation method |
| US14/777,253 US20160010511A1 (en) | 2013-03-21 | 2014-03-21 | Power generation system and method to operate |
| CN201480016865.5A CN105051328A (en) | 2013-03-21 | 2014-03-21 | Power generation system and method to operate |
| EP14713426.6A EP2951406A1 (en) | 2013-03-21 | 2014-03-21 | Power generation system and method to operate |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13160404.3 | 2013-03-21 | ||
| EP13160404 | 2013-03-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014147232A1 true WO2014147232A1 (en) | 2014-09-25 |
Family
ID=47913187
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2014/053446 Ceased WO2014146861A1 (en) | 2013-03-21 | 2014-02-21 | Power generation system and method to operate |
| PCT/EP2014/055725 Ceased WO2014147232A1 (en) | 2013-03-21 | 2014-03-21 | Power generation system and method to operate |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2014/053446 Ceased WO2014146861A1 (en) | 2013-03-21 | 2014-02-21 | Power generation system and method to operate |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20160010511A1 (en) |
| EP (1) | EP2951406A1 (en) |
| JP (1) | JP2016519239A (en) |
| CN (1) | CN105051328A (en) |
| WO (2) | WO2014146861A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723557B (en) * | 2019-01-28 | 2023-08-01 | 华北电力大学 | Oxy-fuel combustion carbon dioxide power generation system with integrated solar methane dry reforming |
| CN115234318B (en) * | 2022-09-22 | 2023-01-31 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system matched with thermal power plant deep peak regulation and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998017897A1 (en) * | 1996-10-21 | 1998-04-30 | Siemens Westinghouse Power Corporation | Hydrogen fueled power plant |
| GB2351323A (en) * | 1999-06-21 | 2000-12-27 | Newtonville Ltd | Heat and power generation plant. |
| WO2003049122A2 (en) * | 2001-12-03 | 2003-06-12 | Clean Energy Systems, Inc. | Coal and syngas fueled power generation systems featuring zero atmospheric emissions |
Family Cites Families (38)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3459953A (en) * | 1967-03-20 | 1969-08-05 | Univ Oklahoma State | Energy storage system |
| CH558975A (en) * | 1972-09-11 | 1975-02-14 | Siemens Ag | NUCLEAR POWER PLANT WITH A STEAM GENERATOR. |
| US3973402A (en) * | 1974-01-29 | 1976-08-10 | Westinghouse Electric Corporation | Cycle improvement for nuclear steam power plant |
| US3998695A (en) * | 1974-12-16 | 1976-12-21 | Cahn Robert P | Energy storage by means of low vapor pressure organic heat retention materials kept at atmospheric pressure |
| US4003786A (en) * | 1975-09-16 | 1977-01-18 | Exxon Research And Engineering Company | Thermal energy storage and utilization system |
| US4338789A (en) * | 1980-02-01 | 1982-07-13 | Dolan John E | Method of varying turbine output of a supercritical-pressure steam generator-turbine installation |
| JPS61205309A (en) * | 1985-03-08 | 1986-09-11 | Hitachi Ltd | Protective operation method and device for feed water heater |
| US5140818A (en) * | 1991-05-09 | 1992-08-25 | Westinghouse Electric Corp. | Internal moisture separation cycle |
| DE4407619C1 (en) * | 1994-03-08 | 1995-06-08 | Entec Recycling Und Industriea | Fossil fuel power station process |
| DE4409196A1 (en) * | 1994-03-17 | 1995-09-21 | Siemens Ag | Process for operating a gas and steam turbine plant and plant operating thereafter |
| JP2880925B2 (en) * | 1995-02-20 | 1999-04-12 | 株式会社東芝 | Hydrogen combustion gas turbine plant |
| US5644911A (en) * | 1995-08-10 | 1997-07-08 | Westinghouse Electric Corporation | Hydrogen-fueled semi-closed steam turbine power plant |
| US5953900A (en) * | 1996-09-19 | 1999-09-21 | Siemens Westinghouse Power Corporation | Closed loop steam cooled steam turbine |
| JP3890104B2 (en) * | 1997-01-31 | 2007-03-07 | 株式会社東芝 | Combined cycle power plant and steam supply method for cooling the same |
| EP0900921A3 (en) * | 1997-09-05 | 2000-01-26 | Mitsubishi Heavy Industries, Ltd. | Hydrogen burning turbine plant |
| DE19745272C2 (en) * | 1997-10-15 | 1999-08-12 | Siemens Ag | Gas and steam turbine plant and method for operating such a plant |
| DE69931548T2 (en) * | 1998-04-07 | 2007-05-10 | Mitsubishi Heavy Industries, Ltd. | turbine plant |
| JP2000009308A (en) * | 1998-06-19 | 2000-01-14 | Ishikawajima Harima Heavy Ind Co Ltd | Exhaust white smoke prevention device for water injection type gas turbine |
| CA2409700C (en) * | 2000-05-12 | 2010-02-09 | Clean Energy Systems, Inc. | Semi-closed brayton cycle gas turbine power systems |
| US6945029B2 (en) * | 2002-11-15 | 2005-09-20 | Clean Energy Systems, Inc. | Low pollution power generation system with ion transfer membrane air separation |
| WO2004081479A2 (en) | 2003-03-10 | 2004-09-23 | Clean Energy Systems, Inc. | Reheat heat exchanger power generation systems |
| US7074033B2 (en) * | 2003-03-22 | 2006-07-11 | David Lloyd Neary | Partially-open fired heater cycle providing high thermal efficiencies and ultra-low emissions |
| DE10325111A1 (en) * | 2003-06-02 | 2005-01-05 | Alstom Technology Ltd | Method for generating energy in a gas turbine comprehensive power generation plant and power plant for performing the method |
| WO2005100754A2 (en) * | 2004-04-16 | 2005-10-27 | Clean Energy Systems, Inc. | Zero emissions closed rankine cycle power system |
| US20070044479A1 (en) * | 2005-08-10 | 2007-03-01 | Harry Brandt | Hydrogen production from an oxyfuel combustor |
| WO2007098239A2 (en) * | 2006-02-21 | 2007-08-30 | Clean Energy Systems, Inc. | Hybrid oxy-fuel combustion power process |
| US20080115500A1 (en) * | 2006-11-15 | 2008-05-22 | Scott Macadam | Combustion of water borne fuels in an oxy-combustion gas generator |
| RU2335642C1 (en) * | 2007-02-19 | 2008-10-10 | Олег Николаевич Фаворский | Electric power generator with high-temperature steam turbine |
| US8091369B2 (en) * | 2008-07-11 | 2012-01-10 | Air Products And Chemicals, Inc. | Method and apparatus for generating electrical power |
| US20100326084A1 (en) * | 2009-03-04 | 2010-12-30 | Anderson Roger E | Methods of oxy-combustion power generation using low heating value fuel |
| DE102009014447A1 (en) * | 2009-03-23 | 2010-09-30 | Man Turbo Ag | Power plant for IGSC process |
| US20110094228A1 (en) * | 2009-10-22 | 2011-04-28 | Foster Wheeler Energy Corporation | Method of Increasing the Performance of a Carbonaceous Fuel Combusting Boiler System |
| US20130074515A1 (en) * | 2011-09-23 | 2013-03-28 | General Electric Company | Gas turbine engine system and method of providing a fuel supplied to one or more combustors in a gas turbine engine system |
| AU2012332494B2 (en) * | 2011-11-02 | 2016-07-07 | 8 Rivers Capital, Llc | Power generating system and corresponding method |
| EP2666977A1 (en) * | 2012-05-21 | 2013-11-27 | Alstom Technology Ltd | High-temperature steam turbine power plant with double reheat |
| US9284857B2 (en) * | 2012-06-26 | 2016-03-15 | The Regents Of The University Of California | Organic flash cycles for efficient power production |
| US20160033128A1 (en) * | 2013-03-21 | 2016-02-04 | Siemens Aktiengesellschaft | Power generation system and method to operate |
| JP6250332B2 (en) * | 2013-08-27 | 2017-12-20 | ８ リバーズ キャピタル，エルエルシー | Gas turbine equipment |
-
2014
- 2014-02-21 WO PCT/EP2014/053446 patent/WO2014146861A1/en not_active Ceased
- 2014-03-21 US US14/777,253 patent/US20160010511A1/en not_active Abandoned
- 2014-03-21 WO PCT/EP2014/055725 patent/WO2014147232A1/en not_active Ceased
- 2014-03-21 CN CN201480016865.5A patent/CN105051328A/en active Pending
- 2014-03-21 JP JP2016503676A patent/JP2016519239A/en active Pending
- 2014-03-21 EP EP14713426.6A patent/EP2951406A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998017897A1 (en) * | 1996-10-21 | 1998-04-30 | Siemens Westinghouse Power Corporation | Hydrogen fueled power plant |
| GB2351323A (en) * | 1999-06-21 | 2000-12-27 | Newtonville Ltd | Heat and power generation plant. |
| WO2003049122A2 (en) * | 2001-12-03 | 2003-06-12 | Clean Energy Systems, Inc. | Coal and syngas fueled power generation systems featuring zero atmospheric emissions |
Non-Patent Citations (2)
| Title |
|---|
| CICCONARDI S P ET AL: "Steam power-plants fed by high pressure electrolytic hydrogen", INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, ELSEVIER SCIENCE PUBLISHERS B.V., BARKING, GB, vol. 29, no. 5, 1 April 2004 (2004-04-01), pages 547 - 551, XP004488750, ISSN: 0360-3199, DOI: 10.1016/S0360-3199(03)00085-5 * |
| STERNFELD H J: "WASSERSTOFF/SAUERSTOFF-DAMPFERZEUGER IN DER ENERGIETECHNIK", VDI BERICHTE, DUESSELDORF, DE, 1 March 1987 (1987-03-01), pages 231 - 247, XP002047184, ISSN: 0083-5560 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2016519239A (en) | 2016-06-30 |
| US20160010511A1 (en) | 2016-01-14 |
| EP2951406A1 (en) | 2015-12-09 |
| WO2014146861A1 (en) | 2014-09-25 |
| CN105051328A (en) | 2015-11-11 |
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