WO2014062464A1 - Système de production d'énergie solaire chimique-thermique couplé et procédé s'y rapportant - Google Patents

Système de production d'énergie solaire chimique-thermique couplé et procédé s'y rapportant Download PDF

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Publication number
WO2014062464A1
WO2014062464A1 PCT/US2013/064226 US2013064226W WO2014062464A1 WO 2014062464 A1 WO2014062464 A1 WO 2014062464A1 US 2013064226 W US2013064226 W US 2013064226W WO 2014062464 A1 WO2014062464 A1 WO 2014062464A1
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Prior art keywords
energy storage
storage material
heat transfer
chemical energy
transfer fluid
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PCT/US2013/064226
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English (en)
Inventor
Luke ERICKSON
Russell MUREN
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Abengoa Solar Inc
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Application filed by Abengoa Solar Inc filed Critical Abengoa Solar Inc
Priority to ES201590033A priority Critical patent/ES2544002B1/es
Priority to CN201380053970.1A priority patent/CN104884874A/zh
Priority to US14/430,036 priority patent/US20150253039A1/en
Priority to EP13847674.2A priority patent/EP2909546A4/fr
Publication of WO2014062464A1 publication Critical patent/WO2014062464A1/fr
Priority to ZA2015/01984A priority patent/ZA201501984B/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S80/20—Working fluids specially adapted for solar heat collectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/20—Solar heat collectors using working fluids having circuits for two or more working fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S60/00—Arrangements for storing heat collected by solar heat collectors
    • F24S60/20—Arrangements for storing heat collected by solar heat collectors using chemical reactions, e.g. thermochemical reactions or isomerisation reactions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S90/00—Solar heat systems not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24V—COLLECTION, PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR
    • F24V30/00—Apparatus or devices using heat produced by exothermal chemical reactions other than combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/003—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using thermochemical reactions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Definitions

  • the embodiments disclosed herein include systems and methods in the field of concentrating solar power (“CSP") generation, also known as solar thermal power generation.
  • CSP concentrating solar power
  • the disclosed systems and methods generally utilize two coupled parallel energy pathways, one thermal and one chemical, to convert solar energy to electrical energy at high efficiency.
  • the disclosed embodiments include a solar receiver in communication with separate chemical energy storage material and heat transfer fluid flowing or transported in separate pathways.
  • the chemical energy storage material undergoes low temperature photoreduction at the receiver.
  • heat transfer fluid is heated to an operational temperature at the solar receiver.
  • the chemical energy storage material and HTF are used to drive a power cycle which operates at relatively high temperatures because the chemical energy storage material is exothermically oxidized as, or in sequence with, the HTF being cooled.
  • Concentrating solar technologies may generally be divided into thermal systems for electric power generation and chemical systems for fuels production and chemical processing.
  • Variations on thermal CSP plants are known in the art which utilize different types of reflector configurations such as troughs, dishes, and heliostat fields.
  • Known CSP systems utilize many alternative heat transfer fluids such as oils, molten salts, and steam and can be used to drive various power cycles such as steam Rankine, supercritical steam
  • Another known method features the use of concentrated sunlight to cause water to undergo photolysis through interaction with catalysts, such as described in US Patent 4,045,315.
  • Other technologies use concentrated sunlight and a reduction/oxidation cycle to create hydrogen gas from water or carbon monoxide gas from carbon dioxide, such as described in US Patent Application 2009/0107044.
  • the foregoing chemical methods are not particularly well suited for the generation of electrical power using known power turbine based power cycles.
  • the overall solar-to-electric efficiency is the product of the solar field efficiency, the receiver (solar-to-thermal) efficiency, the storage efficiency, and the power cycle (thermal-to-electric) efficiency.
  • the thermal-to-electric conversion system is very similar to fossil fuel systems at comparable temperatures, however, the conversion efficiency of a solar power cycle is typically much less than that of a combined cycle gas plant due to the lower operational temperatures.
  • the embodiments disclosed herein include concentrating solar power (CSP) systems and methods which couple a thermal and a chemical energy pathway.
  • the thermal pathway utilizes a heat transfer fluid to collect concentrated sunlight as thermal energy at medium temperature and transfer this energy to a thermal-to-electric power cycle.
  • the chemical pathway uses a redox material which undergoes direct photoreduction in the receiver to store the solar energy as chemical potential. This redox material is then oxidized at very high temperatures in the power cycle in series with the thermal pathway heat exchanger.
  • This coupling allows the receiver to perform at the high efficiencies typical of state of the art thermal power towers while simultaneously achieving the power cycle efficiencies typical of natural gas combustion plants and achieving a very high overall solar- to-electric conversion efficiency.
  • One disclosed embodiment is a CSP system comprising a solar receiver configured to receive concentrated solar flux and a quantity of heat transfer fluid (HTF) in thermal communication with the solar receiver such that concentrated solar flux heats the HTF.
  • the system also includes a heat exchanger in thermal communication with the HTF providing for heat exchange between the HTF and the working fluid of a power generation cycle.
  • the system also includes a chemical energy storage material flowing in a chemical pathway coupled to the thermal pathway.
  • the chemical energy storage material is also in communication with the solar receiver such that concentrated solar flux reduces a quantity of the chemical energy storage material in the reduction portion of an oxidation- reduction reaction.
  • the chemical energy storage material can be alternatively referred to as a redox material.
  • the system further includes an oxidizer in communication with the chemical energy storage material, the oxidizer providing for the exothermic oxidation of the chemical energy storage material and further providing for heat exchange between the chemical energy storage material and the working fluid of the power cycle.
  • the system utilizes parallel energy pathways, one thermal and one chemical. The use of two pathways coupled at the solar receiver results in a high- efficiency CSP plant.
  • the system may further include thermal energy storage operatively associated with a HTF conduit.
  • the system may include separate chemical energy storage including a reduced chemical storage system operatively receiving reduced chemical energy storage material from the solar receiver; and/or an oxidized chemical storage system receiving oxidized chemical energy storage material from the oxidizer.
  • An alternative embodiment disclosed herein comprises a power generation method having certain steps which may be performed in any suitable order and which typically will be performed in a cyclical fashion.
  • the method embodiments are initiated by providing a solar receiver configured to receive concentrated solar flux.
  • HTF of any suitable type is flowed, transported or otherwise brought into thermal communication with the solar receiver where the HTF is heated with the concentrated solar flux.
  • the heated HTF is then flowed or transported from the solar receiver to a heat exchanger in a heat transfer fluid conduit. In the heat exchanger heat is exchanged between the heated heat transfer fluid and the working fluid of a power cycle.
  • a chemical energy storage (redox) material in communication with the solar receiver is irradiated by the concentrated solar flux thereby causing a quantity of the chemical energy storage material to be reduced.
  • the reduced chemical energy storage material is then flowed or transported between the solar receiver and an oxidizer element.
  • the chemical energy storage material is oxidized causing the release of heat energy.
  • the released heat energy is exchanged with the working fluid of the power cycle. Power may then be generated with the heated working fluid of the power cycle,
  • the disclosed embodiments all feature dual thermal and chemical energy pathways.
  • the embodiments may be implemented in any type of concentrating solar power apparatus and with any type of power generation cycle or cycles.
  • FIG. 1 is a simplified system schematic diagram illustrating a prior art CSP system.
  • FIG. 2 is a simplified system schematic diagram illustrating one embodiment of a system having thermal and chemical energy pathways as described herein.
  • FIG. 3 is a schematic diagram illustrating a redox cycle.
  • FIG. 4 is a simplified power cycle schematic illustrating a representative power cycle suitable for implementation with the systems disclosed herein.
  • FIG. 5 is simplified receiver schematics illustrating how the coupled pathways disclosed herein reduce radiative losses.
  • FIG. 6 is a simplified system schematic diagram illustrating an alternative received design.
  • FIG. 7 is a flow chart representation of a representative method as disclosed herein.
  • the concentrated solar radiation is transferred as thermal energy to the receiver and captured with an intermediate heat transfer fluid.
  • Thermal energy is then stored as hot stock heat transfer fluid in large tanks.
  • the hot heat transfer fluid is sent to the power cycle via a heat exchanger.
  • thermal energy is converted into electricity in a thermodynamic power cycle.
  • a representative system 100 includes one or more thermal pathways 102 consisting of a heat transfer fluid (HTF) such as steam/water, molten or solid salt, molten or solid metal, oil a phase change material or other suitable HTF in thermal communication with a solar receiver 104.
  • HTF heat transfer fluid
  • the solar receiver 104 is typically associated with a central receiver tower and receives concentrated solar flux reflected by a field of heliostats.
  • the methods disclosed herein could be implemented with other CSP designs however, including but not limited to parabolic trough, linear Fresnel, and dish/engine systems.
  • HTF heated at the solar receiver 104 is flowed or transported to a heat exchanger 106 in a heat transfer fluid conduit 108.
  • HTF heat transfer fluid
  • the system and methods may be implemented with a liquid, solid, gaseous or phase-changing HTF.
  • the heat transfer fluid conduit 108 may be a system of pipes or ducts and valves suitable for the control of fluid flow, or the heat transfer fluid conduit 108 may be any type of system suitable for transporting solids.
  • the heat transfer fluid conduit 108 may include some fluid flow sections and some solid transport sections.
  • thermal energy is exchanged between the HTF and the working fluid of a power cycle.
  • the heat exchanger(s) may be of any type or any level of sophistication needed to provide for heat exchange between the HTF and a power generation cycle working fluid.
  • the heat exchanger 106 and other subsystems are, for technical convenience, described and shown in the figures as simple schematic elements. All elements of a commercial system would be implemented with more complex apparatus.
  • the heated working fluid drives a power generation cycle 1 10. Accordingly, the working fluid is, either directly or through an intermediate power cycle fluid, converted to mechanical energy and then electrical energy.
  • the system 100 and methods disclosed herein also include a parallel chemical energy pathway which includes a chemical energy storage material which undergoes reversible reduction and oxidation reactions (alternatively referred to herein as a "redox material").
  • a chemical energy storage material which undergoes reversible reduction and oxidation reactions
  • the redox material is reduced in the receiver 104 and oxidized in an oxidizer 112.
  • the oxidizer or an associated apparatus also provides for heat exchange with the working fluid of the power cycle 1 10.
  • the redox material is flowed or transported between the receiver and oxidizer in a chemical energy storage material conduit 1 14 which may be configured for fluid flow or solid transport as described above with respect to the HTF conduit 108.
  • the redox material is directly photoreduced by the high concentration of incident photons in the receiver 104, thus, the redox material stores the absorbed electromagnetic energy as a chemical potential.
  • the redox material is oxidized, thereby releasing high temperature thermal energy.
  • a representative diagram of this type of chemical process is shown in Fig. 3 and described below. It is important to note that the oxidizer element 1 12 will typically be implemented with apparatus of significantly more complexity than is shown on Fig. 2.
  • the oxidizer 112 may include separate oxidation chambers, air or gas supplies, fluidized bed, heat exchanger and other elements.
  • CSP systems achieve a certain level of efficiency when implemented, for example, with current state of the art steam or molten salt receivers.
  • power plants implemented with combustive power cycles have very good performance (for example, combined cycle natural gas plants).
  • the coupled thermal-chemical architecture described herein allows a CSP system to take advantage of both power generation technologies without any fossil fuel consumption or environmentally harmful emissions.
  • the disclosed systems and methods have an advantage over known state-of-the-art CSP plants in increased thermal-to-electric conversion efficiency due in part to the high temperature of the oxidation process.
  • typical steam or molten salt CSP based power generation plants achieve thermal-to-electric efficiencies of 40-44%.
  • the disclosed systems and methods can achieve temperatures suitable to drive a power generation system having overall efficiencies of approximately 60% which are much closer to the efficiencies exhibited by combined cycle natural gas plants
  • the chemical energy pathway described above represents new system architecture in the CSP industry. Whereas a thermal pathway transfers energy by heating and cooling a heat transfer fluid, a chemical pathway transfers energy by storing energy in a material via an endothermic reaction and releasing it in an exothermic reaction. As noted above, the chemical pathway will consist of a material undergoing reversible reduction and oxidation reactions. For illustration purposes, one potential set of reactions is shown in Fig. 3, although the embodiments disclosed herein can be implemented with many alternative redox materials.
  • a representative redox cycle features a reduction step (top box) which takes place in the solar receiver.
  • a photon hits the oxidized material and breaks it into a reduced material and free oxygen. This step depends only on the photon directly supplying energy to break the bond between the metal and oxygen atoms.
  • the reduced material (MnO in this example) is transferred to a storage tank. When it is needed, it is transferred to the power cycle where it is burned in oxygen releasing heat and closing the loop by recreating the original oxidized material.
  • the foregoing representative redox process is governed by the balance between the energy of the chemical bonds and the energy of the photon.
  • the bond energies are typically described in terms of Gibbs free energy, AG, and the energy required to drive an endothermic reaction or the energy released by an exothermic reaction can be calculated with Equation 1.
  • Reference AG values can be obtained from chemistry texts, NIST databases, or other sources.
  • the coefficients come from the balanced chemical equation.
  • the energy of the photon causing the reaction must be higher than the free energy required to drive the reaction.
  • the photon energy can be calculated from Equation 2. Equation 2
  • h Planck's constant
  • c the speed of light
  • ⁇ the photon's wavelength
  • Photons available for solar collection are generally in the visible range, 380-750nm.
  • transition metal oxides For example, manganese oxides and cobalt oxides with additions of iron oxide and aluminum oxide have previously been identified as prime candidates for direct photoreduction technologies. See, for example, General Atomics. "Thermochemical heat storage for concentrated solar power based on multivalent metal oxides. " DOE Program Review, May 201 1. http://wwwl .eere.energy.gov/solar/csp_pr201 l .html accessed on Dec 19, 201 1, which disclosure is incorporated herein in its entirety.
  • heat loss management was identified as a problem in the above rotary kiln reactor study. Additionally, the fraction of material undergoing reduction was low, on the order of 3%, leading to high capital costs.
  • the systems and methods disclosed herein use solar photons to directly photoreduce the redox material.
  • the energy does not go through a thermal state in between the electromagnetic (solar photon) and the chemical potential state.
  • the disclosed technology works best with materials that do not thermochemically dissociate below 1400°C, the desired power cycle hot temperature, which is much hotter than achievable with known CSP technologies.
  • the system and methods disclosed herein can be utilized to drive any type of power generation cycles.
  • the known power cycle most suited to operation at efficiencies near or above 60% is however, an air-Brayton cycle or a variation thereof.
  • a highly simplified diagram of one possible representative and non-limiting power cycle layout 400 is illustrated in Fig. 4.
  • the Fig. 4 example layout illustrates how the thermal and chemical heat sources described above could be integrated into an air-Brayton power cycle 402 in conjunction with a steam Rankine bottoming cycle 404.
  • other power cycles could also be used.
  • Certain advantages can be realized if the working fluid contains an oxidizing agent. For example, an open-loop supercritical carbon dioxide or steam cycle could be used where the CO2 or H2O would be reduced to CO or 3 ⁇ 4, respectively, which could then be used for liquid fuel generation or as fuel for fuel cells.
  • the upper open air Brayton cycle utilizes air as a working fluid and oxidizing agent.
  • the air is initially compressed in compressor 406 which is driven by a mechanical connection to a downstream turbine 408.
  • the compressed air from the compressor 406 is heated through heat exchange with the HTF in heat exchanger 106.
  • the heated and compressed air oxidizes the chemical energy storage material in the oxidizer 112 and thus is further heated by direct contact or indirect heat exchange with the chemical energy storage material as it releases heat during the exothermic oxidation reaction.
  • the now high temperature air drives one or more turbines 408 which in turn drive the compressor 406 and one or more generators (not shown on Fig. 4) to generate electrical energy.
  • the Fig. 4 embodiment also includes a lower steam Rankine bottoming cycle 404 receiving somewhat cooled air from the outlet of the turbine 408. Heat is exchanged between the air and a secondary working fluid, for example steam, in a recuperator/heat exchanger 410. The heated steam then drives a second turbine 412 or a second series of turbines which in turn drive one or more generators to generate electrical energy. Steam exiting the turbine 412 is condensed in a condenser 414 and pumped as water back to the recuperator/heat exchanger 410 by pump 416.
  • a secondary working fluid for example steam
  • thermochemical and direct photoreduction chemical receivers One source of inefficiency for thermochemical and direct photoreduction chemical receivers is heat loss during the reduction stages.
  • some or most of the heat losses from the redox material can be recaptured by the thermal receiver and any residual heat stored in the redox material at the outlet of the receiver can be transferred back to pre-heat the cool HTF entering the receiver.
  • FIG. 5 A diagram illustrating a receiver design with improved heat loss management is shown in Fig. 5.
  • Incident solar radiation (shown as arrows 502) is concentrated on the receiver 104 where some of the photons are absorbed by the redox material (dots 504).
  • a large part of the remaining incident photons are absorbed by the thermal receiver (illustrated as panel 506).
  • HTF is flowing within the panel 506 absorbing heat.
  • the photons absorbed by the redox material some cause photoreduction while others directly heat the redox material. Some of this absorbed heat is radiated and lost to the environment but some is reabsorbed by the thermal receiver (illustrated by the dashed arrows 508).
  • the receiver will still maintain high total efficiency.
  • the receiver embodiment of Fig. 5 couples a gravity fed curtain of redox material with a traditional cavity receiver tube sheet having HTF cooling.
  • the receiver element may be implemented as a rotating cavity receiver 104 in which the walls are cooled by HTF and baffles are used to continuously drop the redox material 600 through the cavity space.
  • the redox material particles are contained in one or more rotating cavity receivers 602. As the receiver 602 rotates, the particles 600 are agitated and fall through the space, absorbing solar radiation. Some of the photons will be absorbed by the reactor walls instead of the particles and will be converted to heat.
  • the reactor walls will be cooled by the thermal pathway's heat transfer fluid 604. This configuration provides for minimized radiative and convective heat losses and maximizes the conversion of solar energy to thermal energy and chemical potential.
  • a further advantage of the coupled thermal-chemical pathway system is that the parallel thermal and chemical systems can be used to store energy over different time scales.
  • Thermal CSP systems such as molten salt towers, provide for relatively low cost short term (day scale) thermal energy storage.
  • heated HTF may be stored directly in a hot thermal storage system 1 16 operatively associated with the HTF conduit 108 receiving flow from the receiver 104 before the heat exchanger 106.
  • heated HTF could be used to heat a separate thermal storage medium through heat exchange at the hot thermal storage system. Heat may then be provided to the HTF from the hot thermal storage system 1 16 during periods of low solar flux, in the evening or during periods of cloud cover for example.
  • cooled HTF may be stored, or used to heat a separate heat storage medium in a cold thermal energy storage system 1 18.
  • the cold thermal energy storage system 1 18 could be operatively associated with the HTF conduit 108 to receive flow from the heat exchanger 106 to the receiver 104 and used as above during periods of lower solar radiation.
  • oxidized or reduced redox material can be stored for an extended period of time in an oxidized chemical storage material storage system 120 and reduced chemical storage material storage system 122 respectively.
  • Both chemical storage systems 120 and 122 could be operatively associated with the chemical energy storage material conduit with the oxidized material storage system being downstream from the oxidizer 1 12 and the reduced material storage system being downstream from the receiver 104.
  • One representative embodiment of the system 100 uses an aluminum silicon (AlSi) phase change material (PCM) as the HTF or in this example, the heat transfer material.
  • AlSi PCM phase change material
  • the disclosed system and methods may advantageously be implemented in a power tower configuration consisting of a heliostat field focused on a receiver on top of a tower structure.
  • the AlSi PCM (or other suitable HTF) and the redox material will be transferred from the receiver to storage vessels or storage systems at the base of the tower.
  • the PCM or other suitable HTF and redox materials may then be transferred to the power cycle as needed for electricity generation.
  • one suitable but non-exclusive thermal-to-electric conversion system is an open air-Brayton power cycle with a steam Rankine bottoming cycle.
  • the inlet air will be compressed to high pressure, passed through a heat exchanger with the AlSi PCM or other HTF to heat it to medium temperatures, then passed through the oxidation chamber to oxidize the redox material and heat the air the very high temperatures.
  • the highly heated air will be used to power a turbine and electric generator.
  • the exhaust air will be used as the heat source for a typical steam bottoming Rankine cycle via a heat recovery steam generator.
  • the disclosed embodiments also include power generation methods, for example the power generation method 700 illustrated in Fig. 7.
  • the Fig. 7 method includes several steps which may be performed in any suitable order and which typically will be performed in a cyclical fashion.
  • the method is initiated by providing a solar receiver configured to receive concentrated solar flux (step 702).
  • Heat transfer fluid of any type is flowed, transported or otherwise brought into in thermal communication with the solar receiver where the HTF is heated with the concentrated solar flux (step 704).
  • the heated HTF is then flowed or transported from the solar receiver to a heat exchanger in a heat transfer fluid conduit (Step 706). In the heat exchanger heat is exchanged between the heated heat transfer fluid and the working fluid of a power cycle (Step 708).
  • a chemical energy storage (redox) material in communication with the solar receiver is irradiated by the concentrated solar flux thereby causing a quantity of the chemical energy storage material to be reduced (Step 710).
  • the reduced chemical energy storage material is then flowed or transported between the solar receiver and an oxidizer in a chemical energy storage material conduit (Step 712).
  • the chemical energy storage material is oxidized causing the release of heat energy (Step 714).
  • the released heat energy is exchanged with the working fluid of the power cycle (Step 716). Power may then be generated with the heated working fluid of the power cycle (Step 718).
  • the coupled chemical-thermal pathway systems and methods offer two other significant benefits.
  • the two energy pathways offer two means of energy storage.
  • the thermal pathway can utilize any existing thermal storage system for short term storage. This is an important advantage that CSP holds over wind and photovoltaic technologies because it allows CSP plants to match demand while reducing the LCOE.
  • the described system can also couple inexpensive short term storage with long term chemical storage to match seasonal demand.
  • the redox material can be stored in an inert environment for very long periods of time and used for power production as needed. This will further allow CSP to meet grid demands during times when very little renewable generation is available.
  • the second additional benefit is the ability to produce syngas.
  • the redox material could be combusted with carbon dioxide or steam to produce carbon monoxide or hydrogen. Together, these two gases constitute syngas which can be used to create liquid fuels. This process would possibly decrease the electric generation capacity of the system but may be a relatively efficient way to produce renewable carbon-neutral fuels.

Abstract

L'invention porte sur un système centrale solaire thermique à concentration (CSP), qui couple une voie de production d'énergie thermique et une voie de production d'énergie chimique. La voie thermique utilise un fluide caloporteur pour collecter la lumière du soleil concentrée sous forme d'énergie thermique à une température moyenne et transférer cette énergie à un cycle de conversion d'énergie thermique en énergie électrique. En parallèle, la voie chimique utilise un matériau redox qui subit une photoréduction directe dans le receveur pour stocker l'énergie solaire sous forme de potentiel chimique. Ce matériau redox est ensuite oxydé à des températures très élevées dans le cycle de production d'énergie en série avec l'échangeur de chaleur de la voie thermique. Ce couplage permet le fonctionnement du receveur aux rendements élevés typiques de tours de production d'énergie thermique de l'état de la technique tout en atteignant simultanément les rendements de cycles de production d'énergie typiques d'installations de combustion de gaz naturel et en atteignant un rendement global de conversion de l'énergie solaire en énergie électrique très élevé.
PCT/US2013/064226 2012-10-16 2013-10-10 Système de production d'énergie solaire chimique-thermique couplé et procédé s'y rapportant WO2014062464A1 (fr)

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CN201380053970.1A CN104884874A (zh) 2012-10-16 2013-10-10 耦合的化学-热太阳能发电系统及其方法
US14/430,036 US20150253039A1 (en) 2012-10-16 2013-10-10 Coupled chemical-thermal solar power system and method
EP13847674.2A EP2909546A4 (fr) 2012-10-16 2013-10-10 Système de production d'énergie solaire chimique-thermique couplé et procédé s'y rapportant
ZA2015/01984A ZA201501984B (en) 2012-10-16 2015-03-23 Coupled chemical-thermal solar power system and method

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CN104884874A (zh) 2015-09-02
EP2909546A1 (fr) 2015-08-26
ZA201501984B (en) 2016-09-28
ES2544002B1 (es) 2016-10-06
US20150253039A1 (en) 2015-09-10
CL2015000934A1 (es) 2016-03-28

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