WO2012065734A1 - Verfahren und vorrichtung zur verdampfung organischer arbeitsmedien - Google Patents
Verfahren und vorrichtung zur verdampfung organischer arbeitsmedien Download PDFInfo
- Publication number
- WO2012065734A1 WO2012065734A1 PCT/EP2011/005778 EP2011005778W WO2012065734A1 WO 2012065734 A1 WO2012065734 A1 WO 2012065734A1 EP 2011005778 W EP2011005778 W EP 2011005778W WO 2012065734 A1 WO2012065734 A1 WO 2012065734A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- medium
- heat
- supplying
- temperature
- evaporator
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
- B01F25/3142—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit the conduit having a plurality of openings in the axial direction or in the circumferential direction
- B01F25/31425—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit the conduit having a plurality of openings in the axial direction or in the circumferential direction with a plurality of perforations in the axial and circumferential direction covering the whole surface
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/002—Control by recirculating flue gases
Definitions
- the present invention relates to a device for direct evaporation of organic working media for generating electrical energy from heat sources by the use of organic media.
- ORC Organic Rankine Cycle
- the working medium is brought to a working pressure by a feed pump, and it is supplied to it in a heat exchanger energy in the form of heat, which is provided by a combustion or a waste heat flow available.
- the working fluid flows via a pressure tube to an ORC turbine, where it is expanded to a lower pressure.
- the expanded working medium vapor flows through a condenser, in which a heat exchange between the vaporous working medium and a cooling medium takes place, after which the condensed working medium is returned by a feed pump to the evaporator in a cyclic process.
- organic media have significantly lower decomposition temperatures compared to water, ie, temperatures at which the molecule bonds of the medium break, resulting in destruction of the working medium and decomposition into corrosive or toxic reaction products. Even if the temperature of the live steam is lower than the decomposition temperature of the medium, the latter can be significantly exceeded at insufficiently flowed through points, as is possible in particular on steam-exposed areas of the heat exchanger. Also, a failure of the feed pump causes the flow through the heat exchanger is interrupted and the working fluid is thus exposed directly to the temperature of the heat source used for evaporation.
- intermediate circuits are conventionally used in ORC plants, in which the heat from the hot medium used for evaporation (flue gas) is transported via an intermediate circuit to the evaporator.
- a thermal oil is typically used whose temperature stability is higher than that of the working medium.
- the single-phase heat transfer with the help of thermal oil allows a more even flow through the heat exchanger, in which the evaporation of the working medium takes place.
- thermal oils are typically combustible, and thus the thermal oil circuit must be pre-pressurized with nitrogen to prevent oxidation of the thermal oil, making the equipment technically complex and expensive.
- thermal oils age due to the high thermal load and must be replaced at regular intervals. This results in downtime for the plant and an increase in costs.
- the circulating pump which transports the oil due to the high viscosity of the thermal oil to perform a large electrical power. Then, the use of the thermal oil results in a significant reduction of the heat transferable and thus the electrical power obtained in comparison to the direct evaporation of a working medium, which manages without an intermediate circuit. It is therefore the object of the present invention to provide an improved ORC process which overcomes the abovementioned disadvantages and in particular is able to guarantee a temperature of the working medium below the decomposition temperature.
- the task is to regulate the temperature at a heat exchanger so that excessive temperatures can be avoided.
- a device comprising a heat exchanger for transferring heat of a heat-supplying medium to a different working fluid from this; a first supply means configured to supply a flow of the heat-supplying medium at a first temperature from a heat source to the heat exchanger; and a second supply means configured to at least partially transfer the heat-supplying medium after passing through the heat exchanger and / or another medium each having a second temperature lower than the first temperature to the flow of the heat-supplying medium to deliver the first temperature.
- the heat exchanger may be provided in particular in the form of an evaporator, in which the working medium is evaporated.
- the temperature of the heat-supplying medium is not only given by the heat source upon exposure of the heat exchanger / evaporator, but it is governed by the return of the heat-carrying medium after passing through the heat exchanger and / or the other medium in the flow of the heat-supplying medium to the Heat exchanger is delivered, regulated.
- another medium may be supplied to the flow of the heat-carrying medium at the second temperature.
- This additional medium may in particular be ambient air that is supplied from outside the device.
- the heat-supplying medium may, in particular, be a hot flue gas, as arises, for example, in the combustion of fossil fuels as a heat source.
- the working medium may in particular be an organic material.
- Said heat exchanger may be a shell and tube heat exchanger, such as a flue or water tube boiler, or a plate heat exchanger, in which the working medium is guided in a jacket of the boiler, through which the flue gas is passed in tubes.
- the above device is part of a steam power plant, in particular an Organic Rankine Cycle (ORC) plant.
- the ORC system further comprises an expansion machine, such as a turbine, a generator, and means for providing the working fluid vaporized in the evaporator to the turbine.
- the expanded, vaporized working fluid may be delivered to a condenser by condensing means (e.g., a pipeline) for condenser, and the working fluid liquefied there may be returned to the heat exchanger in a circulatory process by a feed pump.
- condensing means e.g., a pipeline
- a decomposition of the organic working medium can be reliably prevented according to the invention by appropriate control of the temperature of the heat-supplying medium below the decomposition temperature of the working medium to the heat exchanger.
- the second supply device comprises a fan or a vacuum device in order to return the cooled heat-supplying medium, after it has passed through the heat exchanger, and / or the further medium into the flow, which acts on the heat exchanger.
- a blower represents a cost low-cost and efficient means of recycling.
- the first feed device may comprise a vacuum device in order to suck the medium from the second feed device.
- the second supply device is designed to supply the heat-supplying medium, after it has passed through the heat exchanger, and / or the further medium to the flow of the heat-supplying medium at the first temperature in such a way that it is distributed over the circumference of the stream becomes.
- the first supply means may comprise a first conduit for conducting the heat-supplying medium at the first temperature
- the second supply means may comprise a second conduit for conducting the heat-supplying medium after passing through the heat exchanger, and / or of the further medium
- the device comprising a mixing section or a mixing section, which is for a fluid connection of the heat-supplying medium with the first temperature in the first conduit and the heat-carrying medium after it has passed through the heat exchanger, and / or the other medium in the second line is formed.
- the mixing section or the mixing section may include a portion of the first conduit having openings formed therein in the shell thereof and a portion of the second conduit surrounding the portion of the first conduit (see also detailed description below).
- the present invention also provides a steam power plant with a device according to one of the above examples of the device according to the invention.
- the additional medium may be ambient air provided outside or inside the steam power plant.
- the step of returning the at least one part of the heat-carrying medium after passing through the evaporator or supplying the further medium, e.g. ambient air, can be performed by means of a fan and / or a vacuum device.
- the at least part of the heat-supplying medium may be mixed after passing through the evaporator with the flow of the heat-supplying medium supplied from the heat source to the evaporator at the first temperature distributed over the circumference of this flow.
- the additional medium can also be supplied over the circumference of the flow of the heat-supplying medium supplied by the heat source to the evaporator.
- the working medium may be or include an organic material and the heat-carrying medium may be or comprise flue gas.
- an increased flexibility in the adaptation of the mixing temperature of the heat-supplying medium when entering the heat exchanger can be provided in that the heat-carrying medium is heated or cooled as desired after exiting the heat exchanger.
- the heat-supplying Medium after passing through the evaporator and before being supplied to the flow of heat supplied from the heat source to the evaporator supplied heat medium to the second temperature or cooled.
- the other medium such as outside air, may be heated or cooled before being supplied to the flow of the heat-supplying medium supplied from the heat source to the evaporator.
- the method may further include the steps of supplying the working medium evaporated in the evaporator to an expansion machine for expanding the evaporated working medium, supplying the expanded, evaporated working medium to a condenser for liquefying the expanded, evaporated working medium, and supplying the liquefied working medium include the evaporator.
- Figure 1 shows a schematic diagram for a conventional ORC system without (left) and with (right) an intermediate circuit.
- Figure 2 illustrates a schematic diagram of an example of an ORC system according to the present invention.
- FIG. 3 shows TQ diagrams for a conventional evaporation process by direct evaporation (left) and the process according to the invention including recirculated cooled flue gas (right).
- FIG. 4 shows a design for a mixing piece for mixing hot flue gas and cooled recirculated flue gas.
- FIG. 1 shows a conventional ORC system with direct evaporation (left) or with an intermediate circuit (right).
- Heat is supplied to a vaporizer 1, which functions as a heat exchanger or heat exchanger, from a heat source (not shown), for example, by a flue gas resulting from combustion of a fuel, as indicated by the left arrow in the left part of FIG .
- a vaporizer 1 which functions as a heat exchanger or heat exchanger, from a heat source (not shown), for example, by a flue gas resulting from combustion of a fuel, as indicated by the left arrow in the left part of FIG .
- a working medium supplied through a feed pump 2.
- the working medium vapor is fed via a pressure line of a turbine 3.
- the turbine 3 drives an electric energy generator 4 (indicated by the right arrow in FIG. 1, respectively).
- the relaxed working medium vapor is condensed in a condenser 5 and the liquefied working medium is fed back to the evaporator 1 via
- an intermediate circuit 6 is used, as shown in the right-hand part of FIG. 1, the heat transfer of the flue gas does not take place directly at the evaporator to the working medium, but by means of a medium, for example a thermo-oil, of the intermediate circuit 6.
- the intermediate circuit 6 comprises a heat exchanger 7, at which the flue gas transfers heat to the medium of the intermediate circuit 6.
- the heat exchanger 7, the medium of the intermediate circuit 6 is supplied by a pump 8. From the heat exchanger 7, the medium of the intermediate circuit 6 passes to the evaporator 1, where it leads to the evaporation of the working medium, which is supplied to the turbine 3.
- FIG. 2 illustrates an exemplary embodiment of the present invention. Elements which have already been described with reference to the prior art shown in Figure 1, are given the same reference numerals.
- the medium eg a flue gas
- the evaporator 1 partially led to the ORC system again.
- the ORC system itself can be, for example, a geothermal or solar thermal system or also have the combustion of fossil fuels as a heat source.
- working media all "dry media” used in conventional ORC systems, such as R245fa, "wet” media, such as ethanol or “isentropic media”, such as R134a, may be used, as well as silicone-based synthetic working media, such as GL160.
- FIG. 3 shows a comparison of the temperature-transferable heat (TQ) diagrams for a conventional evaporation method by direct evaporation (left) and the method according to the invention with reference to the recirculated cooled flue gas.
- TQ temperature-transferable heat
- the residual heat of the recirculated cooled flue gas which is simply lost in conventional methods, is made available again for the heat transfer in the evaporator 1 and is indicated in the right-hand illustration of FIG. 3 with the aid of the hatched bar.
- the pinch point of the next approximation of the TQ curves of flue gas and working medium is at the end of the preheater, which is typically upstream of the evaporator 1 or can be considered as a part thereof, and thus reduces the heat transferable in the evaporator 1 at a constant held Pinch Point Temperature AT Pi nch (temperature difference between exothermic (relatively hot) and heat-absorbing (relatively cold) mass flow, here the difference at the point of the next approximation of the TQ curves of flue gas and working medium).
- the temperature gradient between the temperature of the inlet of the mixed flue gas and the temperature of the flue gas at the outlet from the evaporator 1 is lower compared to the conventional method, however, since the evaporator 1 is flowed through by a larger mass flow per unit time, the heat transfer coefficient U increases that for a same throughput of flue gas theoretically no significant increase in the area A of the evaporator is necessary. In practice, however, one will adjust the area so as not to increase the exhaust back pressure too much.
- the transmittable heat flow per unit time of the evaporator 1 to U ⁇ A ⁇ ⁇ determined ⁇ , where with ⁇ ⁇ the mean logarithmic driving temperature difference is called.
- Typical rates for the recirculation mass flow are in the range of 10 to 60% of the flue gas mass flow for mixing temperatures when the flue gas enters the heat exchanger from 300 ° C to 200 ° C.
- the additional amount of heat of the recirculated gas according to the invention leads to a mitigation of the effect of reducing the amount of heat transferable due to the lower flue gas inlet temperature.
- the mixture may be via a mixing piece comprising a portion 21 of a first conduit for directing the hot flue gas flow having openings 22 formed therein in the shell thereof and a portion 23 of a second conduit for conducting the recirculated flue gas, the portion 23 of the second conduit surrounds the part 21 of the first conduit and is sealed with this outside by a seal 24, as illustrated in Figure 4.
- the pressurized by a blower recirculated flue gas is forced through the openings 22 in the part of the jacket of the first line in this, so that it can mix homogeneously with the hot flue gas.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180055672.7A CN103282719B (zh) | 2010-11-17 | 2011-11-16 | 用于蒸发有机工作介质的方法和装置 |
JP2013539164A JP6047098B2 (ja) | 2010-11-17 | 2011-11-16 | 有機作動媒体を蒸発させる方法および装置 |
US13/883,882 US9829194B2 (en) | 2010-11-17 | 2011-11-16 | Method and apparatus for evaporating organic working media |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10014706.5 | 2010-11-17 | ||
EP10014706.5A EP2455658B1 (de) | 2010-11-17 | 2010-11-17 | Verfahren und Vorrichtung zur Verdampfung organischer Arbeitsmedien |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012065734A1 true WO2012065734A1 (de) | 2012-05-24 |
Family
ID=44148713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/005778 WO2012065734A1 (de) | 2010-11-17 | 2011-11-16 | Verfahren und vorrichtung zur verdampfung organischer arbeitsmedien |
Country Status (5)
Country | Link |
---|---|
US (1) | US9829194B2 (de) |
EP (1) | EP2455658B1 (de) |
JP (2) | JP6047098B2 (de) |
CN (1) | CN103282719B (de) |
WO (1) | WO2012065734A1 (de) |
Cited By (1)
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US20160254674A1 (en) * | 2014-02-07 | 2016-09-01 | Isuzu Motors Limited | Waste heat recovery system |
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EP2455658B1 (de) * | 2010-11-17 | 2016-03-02 | Orcan Energy AG | Verfahren und Vorrichtung zur Verdampfung organischer Arbeitsmedien |
JP6485688B2 (ja) * | 2014-12-25 | 2019-03-20 | パナソニックIpマネジメント株式会社 | 熱発電装置 |
FR3036178A1 (fr) * | 2015-05-13 | 2016-11-18 | Aqylon | Procede de refroidissement d'une source chaude destinee a echanger avec un fluide de travail d'un systeme thermodynamique, installation mettant en œuvre ce procede et systeme thermodynamique |
CN105937759A (zh) * | 2016-04-28 | 2016-09-14 | 上海光热实业有限公司 | 用于电厂烟气余热利用的orc省煤器和系统及方法 |
JP6718802B2 (ja) * | 2016-12-02 | 2020-07-08 | 株式会社神戸製鋼所 | 熱エネルギー回収装置及びその立ち上げ運転方法 |
JP7009227B2 (ja) * | 2018-01-18 | 2022-01-25 | 株式会社神戸製鋼所 | 熱エネルギー回収装置 |
JP6980546B2 (ja) * | 2018-01-31 | 2021-12-15 | 株式会社神戸製鋼所 | 熱エネルギー回収装置 |
US11421663B1 (en) | 2021-04-02 | 2022-08-23 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power in an organic Rankine cycle operation |
US11493029B2 (en) | 2021-04-02 | 2022-11-08 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power at a drilling rig |
US11236735B1 (en) | 2021-04-02 | 2022-02-01 | Ice Thermal Harvesting, Llc | Methods for generating geothermal power in an organic Rankine cycle operation during hydrocarbon production based on wellhead fluid temperature |
US11293414B1 (en) | 2021-04-02 | 2022-04-05 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power in an organic rankine cycle operation |
US11359576B1 (en) | 2021-04-02 | 2022-06-14 | Ice Thermal Harvesting, Llc | Systems and methods utilizing gas temperature as a power source |
US11644015B2 (en) | 2021-04-02 | 2023-05-09 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power at a drilling rig |
US11592009B2 (en) | 2021-04-02 | 2023-02-28 | Ice Thermal Harvesting, Llc | Systems and methods for generation of electrical power at a drilling rig |
US11486370B2 (en) | 2021-04-02 | 2022-11-01 | Ice Thermal Harvesting, Llc | Modular mobile heat generation unit for generation of geothermal power in organic Rankine cycle operations |
US11480074B1 (en) | 2021-04-02 | 2022-10-25 | Ice Thermal Harvesting, Llc | Systems and methods utilizing gas temperature as a power source |
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2011
- 2011-11-16 JP JP2013539164A patent/JP6047098B2/ja active Active
- 2011-11-16 WO PCT/EP2011/005778 patent/WO2012065734A1/de active Application Filing
- 2011-11-16 CN CN201180055672.7A patent/CN103282719B/zh active Active
- 2011-11-16 US US13/883,882 patent/US9829194B2/en active Active
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2015
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US9819193B2 (en) * | 2014-02-07 | 2017-11-14 | Isuzu Motors Limited | Waste heat recovery system |
Also Published As
Publication number | Publication date |
---|---|
US9829194B2 (en) | 2017-11-28 |
EP2455658A1 (de) | 2012-05-23 |
JP2014501899A (ja) | 2014-01-23 |
EP2455658B1 (de) | 2016-03-02 |
JP2015158205A (ja) | 2015-09-03 |
CN103282719B (zh) | 2016-04-20 |
CN103282719A (zh) | 2013-09-04 |
US20160047540A1 (en) | 2016-02-18 |
JP6047098B2 (ja) | 2016-12-21 |
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