EP3757359A1 - Cycle régénératif parallèle dans un cycle de rankine organique comportant une source de chaleur par convection - Google Patents
Cycle régénératif parallèle dans un cycle de rankine organique comportant une source de chaleur par convection Download PDFInfo
- Publication number
- EP3757359A1 EP3757359A1 EP19182579.3A EP19182579A EP3757359A1 EP 3757359 A1 EP3757359 A1 EP 3757359A1 EP 19182579 A EP19182579 A EP 19182579A EP 3757359 A1 EP3757359 A1 EP 3757359A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat recovery
- recovery unit
- regenerator
- rankine cycle
- fluid
- 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.)
- Withdrawn
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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
- F01K25/08—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
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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
- 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
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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
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Definitions
- the present invention relates generally to an Organic Rankine Cycle system and, more particularly, to an improved overall energy conversion of an Organic Rankine Cycle (ORC) in a convective heat source, like a gas turbine + ORC combined cycle power plant.
- ORC Organic Rankine Cycle
- Gas turbine combined cycle power plants based on a water-steam bottoming cycle are a well-known technology.
- the Organic Rankine Cycle is a similar technology like water-steam but the ORC uses an organic working fluid which can be selected based on the available heat source temperature and the application.
- the liquid working fluid is therefore pumped via a heat exchanger (called regenerator) into a waste heat recovery unit (WHRU).
- regenerator is a heat exchanger between the ORC turbine outlet and the condenser inlet to utilize the superheated energy at the turbine exhaust to heat-up the liquid working fluid before entering the WHRU.
- the liquid ORC working fluid will be heated up to approximately 125°C at the outlet of the regenerator before entering the waste heat recovery unit.
- a further goal of the invention is to provide a method for operating an Organic Rankine Cycle system.
- an Organic Rankine Cycle system comprising, arranged one behind the other in the direction of flow of an organic fluid in an Organic Rankine Cycle, a turbine, a regenerator with a first side, a condenser, a feed pump, the regenerator with a second side and a heat recovery unit with first heating surfaces.
- the invention is characterized in that the organic Rankine Cycle branches out between the condenser and the regenerator and reunites between the regenerator and the heat recovery unit, forming first and second branches, wherein the first branch includes the regenerator and the second branch includes a second heating surface arranged in the heat recovery unit behind the first heating surfaces in the direction of flow of a flue gas through the heat recovery unit.
- the invention is for so called direct heat exchange cycles where the convective heat source is used in a Waste Heat Recovery Unit (WHRU) to evaporate the ORC working fluid.
- WHRU Waste Heat Recovery Unit
- the essential idea of the present invention is that the ORC bottoming cycle design is changed in that way that the liquid ORC working fluid will be split into two streams.
- the first stream is the "normal" way to the regenerator to heat-up the liquid working fluid as done in the standard cycle design in an ORC bottoming cycle;
- the second stream is routed without pre-heating directly to a separate, additional economizer of the Waste Heat Recovery Unit to cool down the flue gas further before leaving the stack.
- the heat recovery unit is connected downstream of a gas turbine in the direction of flow of an exhaust gas.
- split ratio of amounts of organic fluid flowing through the first and second branches is adjustable.
- the split ratio can be adjusted based on the specific needs to optimize the heat recovery and overall energy conversion.
- the split ratio is an additional optimization parameter in the design of the combined cycle power plant with gas turbine and Organic Rankine Cycle.
- a separator is arranged between the heat recovery unit and the turbine. There the evaporated portion is separated from the non-evaporated portion of the organic fluid. The evaporated portion is fed to the downstream turbine and drives it. The non-evaporated portion is returned to the inlet of the WHRU.
- a liquid organic fluid is circulated to first heating surfaces of a heat recovery unit, where heat is introduced to the fluid in order to convert it to vapor, with the vapor then passing through a turbine, with the resulting cooled vapor then passing through a first side of a regenerator and a condenser one after the other.
- the method according to the present invention is now characterized in that before the organic fluid flows through a second side of the regenerator a stream of the organic fluid is divided into first and second partial streams, wherein the first partial stream passes through the second side of the regenerator and the second partial stream passes through a second heating surface of the heat recovery unit, wherein the second heating surface is arranged in the heat recovery unit behind the first heating surfaces in the direction of flow of a flue gas through the heat recovery unit.
- the Organic Rankine Cycle system according to the invention as well as the corresponding method utilize the hot flow from the convective heat source (like a gas turbine exhaust) much more compared to the standard ORC cycle design without increasing too much the heat loss in the condenser which will result into a higher power output of the ORC bottoming cycle and thus results into a higher overall energy conversion (CCPP efficiency).
- the convective heat source like a gas turbine exhaust
- the parallel regenerative cycle utilizes the available heat from the convective heat source much better compared to prior art ORC by reducing the stack outlet temperature without increasing too much the loss in the condenser.
- the parallel regenerative cycle is the optimum in both: partially regenerate to limit the loss in the condenser, partially further extract heat from the convective heat source.
- the parallel regenerative cycle design can be used with different ORC working fluids and is not limited to a single working fluid. The behavior is the same, regardless of the ORC working fluid.
- Figure 1 shows a well-known closed Organic Rankine Cycle system 1 commonly used for the purpose of producing electrical power.
- the embodiment of Figure 1 comprises an Organic Rankine Cycle 2 and a gas turbine 14 as the source of heat to the heat recovery unit 9 with first heating surfaces 10.
- the closed Organic Rankine Cycle 2 comprises a heat recovery unit 9 for the evaporation of the organic fluid, a turbine 3 fed with vapor from the heat recovery unit 9 to drive the generator 16 or other load, a condenser 6 for condensing the exhaust vapors from the turbine 3 and a feed pump 7, for recycling the condensed fluid to the heat recovery unit 9.
- the Organic Rankine Cycle 2 shown in Figure 1 further comprises a regenerator 4, which is a heat exchanger between the turbine outlet 17 and the condenser inlet 18 to utilize the superheated energy at the turbine exhaust to heat-up the liquid working fluid before entering the heat recovery unit 9.
- a first side 5 of the regenerator 4 is therefore arranged in the Organic Rankine Cycle 2 between the turbine 3 and the condenser 6, whereas a second side 8 of the regenerator 4 is arranged between the feed pump 3 and the heat recovery unit 9.
- a separator 15 is arranged between the heat recovery unit 9 and the turbine 3 in order to separate the liquid from the vapor phase of the organic fluid.
- Figure 2 shows an Organic Rankine Cycle system 1 according to the invention. It distinguishes from the prior art by a change in the ORC bottoming cycle design. It is changed in that the liquid ORC working fluid is split into two partial streams.
- a first branch 11 for a first partial stream is the "normal" way to the regenerator 4 to heat-up the liquid working fluid as done in the standard cycle design in an ORC bottoming cycle shown in Figure 1 .
- the second partial stream is routed via a second branch 12 without pre-heating directly to a second heating surface 13 arranged in the heat recovery unit 9 behind the first heating surfaces 10 in the direction of flow of a flue gas through the heat recovery unit 9.
- the second heating surface 13 acts like a separate, additional economizer of the heat recovery unit 9 to cool down the flue gas further before leaving the stack.
- a split ratio of amounts of organic fluid flowing through the first 11 and second branches 12 is adjustable.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19182579.3A EP3757359A1 (fr) | 2019-06-26 | 2019-06-26 | Cycle régénératif parallèle dans un cycle de rankine organique comportant une source de chaleur par convection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19182579.3A EP3757359A1 (fr) | 2019-06-26 | 2019-06-26 | Cycle régénératif parallèle dans un cycle de rankine organique comportant une source de chaleur par convection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3757359A1 true EP3757359A1 (fr) | 2020-12-30 |
Family
ID=67070759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19182579.3A Withdrawn EP3757359A1 (fr) | 2019-06-26 | 2019-06-26 | Cycle régénératif parallèle dans un cycle de rankine organique comportant une source de chaleur par convection |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP3757359A1 (fr) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10052414A1 (de) * | 2000-10-23 | 2002-05-08 | Frank Eckert | Verfahren zum Betreiben einer Energieumwandlungseinrichtung sowie Vorrichtung zur Durchführung eines solchen Verfahrens |
| US20060207255A1 (en) * | 2003-07-31 | 2006-09-21 | Boettger Matthias | Method and device for carrying out a thermodynamic cycle |
| DE102009014185A1 (de) * | 2009-03-20 | 2010-09-30 | GMK-Gesellschaft für Motoren und Kraftanlagen mbH | Vorrichtung zur Energieumwandlung nach dem ORC-Prinzip, ORC-Anlage mit einer derartigen Vorrichtung und Verfahren zur Inbetriebnahme und/oder zum Betreiben einer derartigen Vorrichtung |
-
2019
- 2019-06-26 EP EP19182579.3A patent/EP3757359A1/fr not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10052414A1 (de) * | 2000-10-23 | 2002-05-08 | Frank Eckert | Verfahren zum Betreiben einer Energieumwandlungseinrichtung sowie Vorrichtung zur Durchführung eines solchen Verfahrens |
| US20060207255A1 (en) * | 2003-07-31 | 2006-09-21 | Boettger Matthias | Method and device for carrying out a thermodynamic cycle |
| DE102009014185A1 (de) * | 2009-03-20 | 2010-09-30 | GMK-Gesellschaft für Motoren und Kraftanlagen mbH | Vorrichtung zur Energieumwandlung nach dem ORC-Prinzip, ORC-Anlage mit einer derartigen Vorrichtung und Verfahren zur Inbetriebnahme und/oder zum Betreiben einer derartigen Vorrichtung |
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