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SE1200019A1 - Thermodynamic solar power plant based on gas turbine with flexible electrical dynamics against the power grid - Google Patents

Thermodynamic solar power plant based on gas turbine with flexible electrical dynamics against the power grid Download PDF

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Publication number
SE1200019A1
SE1200019A1 SE1200019A SE1200019A SE1200019A1 SE 1200019 A1 SE1200019 A1 SE 1200019A1 SE 1200019 A SE1200019 A SE 1200019A SE 1200019 A SE1200019 A SE 1200019A SE 1200019 A1 SE1200019 A1 SE 1200019A1
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SE
Sweden
Prior art keywords
thermally conductive
heating member
solar energy
energy
conductive heating
Prior art date
Application number
SE1200019A
Other languages
Swedish (sv)
Inventor
Pierluigi Tenca
Original Assignee
Abb Research Ltd
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Filing date
Publication date
Application filed by Abb Research Ltd filed Critical Abb Research Ltd
Priority to SE1200019A priority Critical patent/SE1200019A1/en
Publication of SE1200019A1 publication Critical patent/SE1200019A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C1/00Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • F02C1/04Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being heated indirectly
    • F02C1/05Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being heated indirectly characterised by the type or source of heat, e.g. using nuclear or solar energy
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03GSPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00Devices for producing mechanical power from solar energy
    • F03G6/06Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/064Devices for producing mechanical power from solar energy with solar energy concentrating means having a gas turbine cycle, i.e. compressor and gas turbine combination
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

Ett system för produktion av elektrisk energi på grundval av solenergi visas. Systemet innefattar en solenergiuppsamlingsenhet, ett termiskt ledande upp-värmningsorgan som är anordnat för överföring av den uppsamlade solenergin till ett fluidflöde med hjälp av ett termiskt värmeöverföringsorgan som är innefattat i det inre av det termiskt ledande uppvärmningsorganet och en elektrisk generator som är kopplad till en turbinenhet som drivs direkt av fluidflödet.Fig 1A system for the production of electrical energy based on solar energy is shown. The system comprises a solar energy collection unit, a thermally conductive heating means arranged for transferring the collected solar energy to a fluid flow by means of a thermal heat transfer means contained within the thermally conductive heating means and an electric generator connected to a turbine unit which is driven directly by the fluid flow. Fig 1

Description

15 20 25 30 35 2 often a suitable turbine. However, such a closed circuit for the circulating fluid may for example require regular maintenance or replacements in case of failure of or severe damage to the closed circuit. The thermal inertia of the circulating fluid may limit the dynamics of the power plant with respect to the power grid or network to which the power plant is connected to. 15 20 25 30 35 2 often a suitable turbine. However, such a closed circuit for the circulating fl uid may for example require regular maintenance or replacements in case of failure of or severe damage to the closed circuit. The thermal inertia of the circulating fluid may limit the dynamics of the power plant with respect to the power grid or network to which the power plant is connected to.

Summary In view of the above discussion, a concern of the present invention is to provide a system for producing electrical energy based on solar energy which may require less maintenance or replacements compared to solar power plants utilizing a closed circuit for circulating fluid.Summary In view of the above discussion, a concern of the present invention is to provide a system for producing electrical energy based on solar energy which may require less maintenance or replacements compared to solar power plants utilizing a closed circuit for circulating fl uid.

A further concern of the present invention is to provide a system for producing electrical energy based on solar energy which may provide increased dynamics with respect to a power grid or network to which the system is connected to.A further concern of the present invention is to provide a system for producing electrical energy based on solar energy which may provide increased dynamics with respect to a power grid or network to which the system is connected to.

A further concern of the present invention is to provide a system for producing electrical energy based on solar energy which may have a decreased or even no reliance on the provision of a combustion chamber and use of fossil fuel.A further concern of the present invention is to provide a system for producing electrical energy based on solar energy which may have a decreased or even no reliance on the provision of a combustion chamber and use of fossil fuel.

To address at least one of these concerns and other concerns, a system in accordance with the independent claim is provided. Preferred embodiments are defined by the dependent claims.To address at least one of these concerns and other concerns, a system in accordance with the independent claim is provided. Preferred embodiments are defined by the dependent claims.

According to the present invention, there is provided a system for producing electrical energy based on solar energy. The system comprises a solar energy collecting unit for collecting solar energy, a thermally conductive heating member arranged to receive a fluid flow and permit passage of the fluid flow through the interior of the thermally conductive heating member.According to the present invention, there is provided a system for producing electrical energy based on solar energy. The system comprises a solar energy collecting unit for collecting solar energy, a thermally conductive heating member arranged to receive a id uid flow and permit passage of the fl uid fl ow through the interior of the thermally conductive heating member.

The solar energy collecting unit is adapted to transfer collected solar energy to the thermally conductive heating member which is arranged to transfer thermal energy from the collected solar energy to the fluid flow when it passes through the interior of the heating member by means of at least one thermal heat transferring element that is comprised in the interior of the thermally conductive heating member. The system also comprises a turbine unit arranged to receive and being directly operable by the fluid flow output from the thermally conductive member, and an electrical generator connected to the turbine unit and being operable by the turbine unit for production of electrical energy. 10 15 20 25 30 35 3 A gist of the present invention is that solar energy may be used to heat the primary operating fluid of a gas turbine directly and in the same geometrical location where the combustion chambers are normally located in gas turbines using fossil fuels. ln principle, the thermally conducting heating member, to which the solar energy is transferred or on which the solar energy is concentrated, may fully replace the combustion chambers used in gas turbines using fossil fuels. The primary operating fluid, which passes through the thermally conducting heating member, receives then quantity of heat needed by the Brayton cycle that is othen/vise supplied by the combustion of the fossil fuel occurring inside the combustion chambers. The present invention may eliminate any intermediate fluid that is first heated by a solar concentrator and then flows through heat exchangers, which have the same role as the combustion chambers with respect to the primary fluid.The solar energy collecting unit is adapted to transfer collected solar energy to the thermally conductive heating member which is arranged to transfer thermal energy from the collected solar energy to the fluid flow when it passes through the interior of the heating member by means of at least one thermal heat transferring element that is comprised in the interior of the thermally conductive heating member. The system also comprises a turbine unit arranged to receive and be directly operable by the fluid fl ow output from the thermally conductive member, and an electrical generator connected to the turbine unit and being operable by the turbine unit for production of electrical energy. 10 15 20 25 30 35 3 A gist of the present invention is that solar energy may be used to heat the primary operating fl uid of a gas turbine directly and in the same geometrical location where the combustion chambers are normally located in gas turbines using fossil fuels . ln principle, the thermally conducting heating member, to which the solar energy is transferred or on which the solar energy is concentrated, may fully replace the combustion chambers used in gas turbines using fossil fuels. The primary operating fluid, which passes through the thermally conducting heating member, then receives quantity of heat needed by the Brayton cycle that is othen / vise supplied by the combustion of the fossil fuel occurring inside the combustion chambers. The present invention may eliminate any intermediate fl uid that is first heated by a solar concentrator and then flows through heat exchangers, which have the same role as the combustion chambers with respect to the primary fl uid.

By “solar energy collecting unit” should, in the context of the present application, be understood any unit which enables sunlight, containing solar energy, to be directed towards the thermally conductive heating member. This may include an arrangement that allows the unit to track the position of the sun during its path over the sky. Examples of solar energy collecting units include, for example, parabolic reflectors, mirror arrays, and/or refractive lenses, etcetera.By “solar energy collecting unit” should, in the context of the present application, be understood any unit which enables sunlight, containing solar energy, to be directed towards the thermally conductive heating member. This may include an arrangement that allows the unit to track the position of the sun during its path over the sky. Examples of solar energy collecting units include, for example, parabolic reflectors, mirror arrays, and / or refractive lenses, etcetera.

Hence, the collected solar energy may be transferred from the solar energy collecting unit to the thermally conductive heating member by means of propagating sunlight.Hence, the collected solar energy may be transferred from the solar energy collecting unit to the thermally conductive heating member by means of propagating sunlight.

The thermally conductive heating member may include an exterior surface that efficiently absorbs the solar energy as thermal energy. The exterior surface may for example comprise energy absorbing pigments, flanges, and/or cavities, etcetera.The thermally conductive heating member may include an exterior surface that efficiently absorbs the solar energy as thermal energy. The exterior surface may for example comprise energy absorbing pigments, fl specified, and / or cavities, etcetera.

The thermally conductive heating member also includes a thermally conductive material which enables a good transfer of heat energy, such as a metal, alloy, and/or ceramic, etcetera.The thermally conductive heating member also includes a thermally conductive material which enables a good transfer of heat energy, such as a metal, alloy, and / or ceramic, etcetera.

At least one thermal heat transferring element is comprised in the interior of the thermally conductive heating member to facilitate transfer of thermal energy to the fluid flow as it passes through the interior of the thermally conductive heating member. The at least one heat transferring element may include the same thermally conductive material as the thermally conductive heating member, or other suitable material. 10 15 20 25 30 35 4 The turbine unit may include an impulse turbine. Alternatively or optionally, the turbine unit may include any rotary engine that extracts mechanical energy from a fluid flow.At least one thermal heat transferring element is comprised in the interior of the thermally conductive heating member to facilitate transfer of thermal energy to the fl uid flow as it passes through the interior of the thermally conductive heating member. The at least one heat transferring element may include the same thermally conductive material as the thermally conductive heating member, or other suitable material. 10 15 20 25 30 35 4 The turbine unit may include an impulse turbine. Alternatively or optionally, the turbine unit may include any rotary engine that extracts mechanical energy from a flow uid flow.

The electrical generator is preferably a high speed generator but may also comprise alternative devices that convert mechanical energy to electrical energy. The generated electricity may be alternating current (AC) or direct current (DC).The electrical generator is preferably a high speed generator but may also comprise alternative devices that convert mechanical energy to electrical energy. The generated electricity may be alternating current (AC) or direct current (DC).

According to one example embodiment of the present invention, the thermal heat transferring element comprises a surface in thermal contact with the fluid flow arranged to transfer thermal energy to the fluid flow.According to one example embodiment of the present invention, the thermal heat transferring element comprises a surface in thermal contact with the fl uid flow arranged to transfer thermal energy to the fluid flow.

“Thermal contact” between an element and a fluid flow should, in the context of the present application, be understood as any type of interaction enabling energy exchange between the element and the fluid flow.“Thermal contact” between an element and a fl uid flow should, in the context of the present application, be understood as any type of interaction enabling energy exchange between the element and the fluid flow.

The system may also comprise a plurality of heat members and may include heat transferring elements having a plurality of surfaces in thermal contact with the fluid.The system may also comprise a plurality of heat members and may include heat transferring elements having a plurality of surfaces in thermal contact with the fluid.

According to another example embodiment of the present invention, the at least one thermal heat transferring element comprises a plurality of flanges and/or fins.According to another example embodiment of the present invention, the at least one thermal heat transferring element comprises a plurality of fl scene and / or fi ns.

Flanges and fins are means for enhancing the heat transfer and/or transfer of thermal energy from the thermally conductive heating member to the fluid flow and may include, for example, rib, rims, edges, and/or other projections protruding from the surface of the interior of the heating member.Flanges and fins are means for enhancing the heat transfer and / or transfer of thermal energy from the thermally conductive heating member to the fl uid fl ow and may include, for example, rib, rims, edges, and / or other projections protruding from the surface of the interior of the heating member.

The thermal heat transferring element may comprise organs of other shapes and having at least one surface in thermal contact with the fluid. A relatively large surface in thermal contact is preferred over a relatively small surface, since a relatively large surface may further facilitate heat transfer compared to a relatively small surface. The organs may include a honeycomb shape, porous material, and/or a folded surface, etcetera.The thermal heat transferring element may comprise organs of other shapes and having at least one surface in thermal contact with the fl uid. A relatively large surface in thermal contact is preferred over a relatively small surface, since a relatively large surface may further facilitate heat transfer compared to a relatively small surface. The organs may include a honeycomb shape, porous material, and / or a folded surface, etcetera.

According to one example embodiment of the present invention, the solar energy collecting unit comprises a plurality of reflectors adapted to direct sunlight towards the thermally conducting heating member.According to one example embodiment of the present invention, the solar energy collecting unit comprises a plurality of reactors adapted to direct sunlight towards the thermally conducting heating member.

According to another example embodiment of the present invention, the system comprises a Compressor unit adapted to compress the fluid flow prior to being input into the thermally conducting heating member and/or prior to being input into the turbine unit. 10 15 20 25 30 35 5 The Compressor may be directly connected to, and driven by, the turbine unit, and/or be driven by electric power. The compressor increases the pressure in the fluid and may include, for example, centrifugal compressors, axial-flow compressors, and/or rotary vane compressors, etcetera.According to another example embodiment of the present invention, the system comprises a Compressor unit adapted to compress the fl uid flow prior to being input into the thermally conducting heating member and / or prior to being input into the turbine unit. 10 15 20 25 30 35 5 The Compressor may be directly connected to, and driven by, the turbine unit, and / or be driven by electric power. The compressor increases the pressure in the fl uid and may include, for example, centrifugal compressors, axial-flow compressors, and / or rotary vane compressors, etcetera.

According to yet another example embodiment of the present invention, the system further comprises a gear box unit via which the turbine unit and the electrical generator are connected.According to yet another example embodiment of the present invention, the system further comprises a gear box unit via which the turbine unit and the electrical generator are connected.

The gear box unit provides speed and torque conversions from the rotating turbine unit to the generator and may, advantageously, be used for controlling the operation of the electrical generator.The gear box unit provides speed and torque conversions from the rotating turbine unit to the generator and may, advantageously, be used for controlling the operation of the electrical generator.

According to one example embodiment of the present invention, the system comprises a heat exchanger adapted to recover thermal heat energy from the fluid flow output from the turbine unit.According to one example embodiment of the present invention, the system comprises a heat exchanger adapted to recover thermal heat energy from the fluid and output from the turbine unit.

The heat exchanger may include a tube heat exchanger, a plate heat exchanger, fluid heat exchanger, or any other solution for transfer thermal energy from the fluid flow output to a second fluid. Using a heat exchanger advantageously increases the plant efficiency, especially if acting as a heat energy source in a separate plant. More specifically it can act as a water boiler for a secondary Rankine cycle in the same system, or in a separate steam plant. The system can also be run in a cogeneration configuration, where the energy recovered by the heat exchanger is used for space or water heating, or drives a unit for cooling or refrigeration.The heat exchanger may include a tube heat exchanger, a plate heat exchanger, fl uid heat exchanger, or any other solution for transfer thermal energy from the fl uid flow output to a second fluid. Using a heat exchanger advantageously increases the plant efficiency, especially if acting as a heat energy source in a separate plant. More specifically it can act as a water boiler for a secondary Rankine cycle in the same system, or in a separate steam plant. The system can also be run in a cogeneration configuration, where the energy recovered by the heat exchanger is used for space or water heating, or drives a unit for cooling or refrigeration.

According to another example embodiment of the present invention, the system comprises an electrical energy storage system for storing electric energy generated by the electrical generator.According to another example embodiment of the present invention, the system comprises an electrical energy storage system for storing electric energy generated by the electrical generator.

The electrical energy storage system may for example comprise an electrical battery that converts electrical energy into stored chemical energy, and/or vice versa. This enables energy to be stored as electrical energy instead of thermal inertia of the fluid mass, which may render a faster response and hence facilitate or enable a more flexible electrical dynamics towards a power grid to which the system may be connected.The electrical energy storage system may for example comprise an electrical battery that converts electrical energy into stored chemical energy, and / or vice versa. This enables energy to be stored as electrical energy instead of thermal inertia of the fl uid mass, which may render a faster response and hence facilitate or enable a more flexible electrical dynamics towards a power grid to which the system may be connected.

Use of an electrical energy storage system may facilitate or allow for a decoupling between the dynamics of the solar driven system, such as power Variations caused by sunlight fluctuations, and the dynamics requested by a power grid to which the system is connected. 10 15 20 25 30 35 6 The electrical energy storage system may further comprise a power converter that adapts the energy output from the system to the power grid dynamics.Use of an electrical energy storage system may facilitate or allow for a decoupling between the dynamics of the solar driven system, such as power Variations caused by sunlight fluctuations, and the dynamics requested by a power grid to which the system is connected. 10 15 20 25 30 35 6 The electrical energy storage system may further comprise a power converter that adapts the energy output from the system to the power grid dynamics.

According to yet another example embodiment of the present invention, the fluid flow comprises air from the surroundings of the system.According to yet another example embodiment of the present invention, the fluid comprises ow comprises air from the surroundings of the system.

Further objects and advantages of the present invention are described in the following by means of exemplifying embodiments. lt is noted that the present invention relates to all possible combinations of features recited in the claims. Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following description. Those skilled in the art realize that different features of the present invention can be combined to create embodiments other than those described in the following.Further objects and advantages of the present invention are described in the following by means of exemplifying embodiments. lt is noted that the present invention relates to all possible combinations of features recited in the claims. Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following description. Those skilled in the art realize that different features of the present invention may be combined to create embodiments other than those described in the following.

Brief description of the drawinqs ln the following, an embodiment of the present invention will be described in more detail with reference to the accompanying drawings, in which: Fig. 1 is a plan view of a system according to an embodiment of the present invention, and Fig. 2 is a vertical cross sectional view of a thermally conductive heating member in accordance with an embodiment of the present invention.Brief description of the drawinqs ln the following, an embodiment of the present invention will be described in more detail with reference to the accompanying drawings, in which: Fig. 1 is a plan view of a system according to an embodiment of the present invention, and Fig. 2 is a vertical cross sectional view of a thermally conductive heating member in accordance with an embodiment of the present invention.

Detailed description The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which an exemplifying embodiment of the present invention is shown. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will convey the scope of the invention to those skilled in the art. Furthermore, like numbers refer to like or similar elements or components throughout. ln the following description, an embodiment of the present invention is described with reference to a system for producing electrical energy based on solar energy.Detailed description The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which an exemplifying embodiment of the present invention is shown. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will convey the scope of the invention to those skilled in the art. Furthermore, like numbers refer to like or similar elements or components throughout. In the following description, an embodiment of the present invention is described with reference to a system for producing electrical energy based on solar energy.

Fig. 1 schematically illustrates a system in which the solar energy is collected by a solar energy collecting unit 1 and transferred to a thermally conductive heating member 3. 10 15 20 25 30 35 7 The collecting unit 1 comprises an array of mirrors 2 that are adapted to focus sunlight onto the thermally conductive heating member 3.Fig. 1 schematically illustrates a system in which the solar energy is collected by a solar energy collecting unit 1 and transferred to a thermally conductive heating member 3. 10 15 20 25 30 35 7 The collecting unit 1 comprises an array of mirrors 2 that are adapted to focus sunlight onto the thermally conductive heating member 3.

The thermally conductive heating member 3 is vertically arranged with a downwardly directed inlet 4 for receiving an air flow, and an upwardly directed outlet 5 for outputting the air flow.The thermally conductive heating member 3 is vertically arranged with a downwardly directed inlet 4 for receiving an air flow, and an upwardly directed outlet 5 for outputting the air flow.

Fig. 2 shows a thermally conductive heating member 3 made of copper and provided with a black, heat absorbing surface. Its interior comprises heat transferring elements 17 in the shape of copper flanges, arranged in thermal contact with the air flow. ln alternative or in addition to copper as choice of material for the thermally conductive heating member 3, the thermally conductive heating member 3 may comprise another metal or another material capable of conducting heat.Fig. 2 shows a thermally conductive heating member 3 made of copper and provided with a black, heat absorbing surface. Its interior comprises heat transferring elements 17 in the shape of copper flanges, arranged in thermal contact with the air flow. ln alternative or in addition to copper as choice of material for the thermally conductive heating member 3, the thermally conductive heating member 3 may comprise another metal or another material capable of conducting heat.

With further reference to Fig. 1, the system comprises an upstream turbine unit 6 connected by a shaft 7 to a downstream compressor 8. Below the compressor 8 and the inlet 4, an electrical AC generator 9 is connected to the rotating shaft 7 via a gear box 10.With further reference to Fig. 1, the system comprises an upstream turbine unit 6 connected by a shaft 7 to a downstream compressor 8. Below the compressor 8 and the inlet 4, an electrical AC generator 9 is connected to the rotating shaft 7 via a gear box 10.

A battery unit 11 is mounted between the generator 9 and a power grid, indicated by reference numeral 12. The battery unit 11 is adapted to store electrical energy generated by electrical generator 9.A battery unit 11 is mounted between the generator 9 and a power grid, indicated by reference numeral 12. The battery unit 11 is adapted to store electrical energy generated by electrical generator 9.

At the top of the system an air-water heat exchanger 13 is provided. lt is arranged to receive the air flow output 15 from the turbine unit and to recover thermal energy from the air. The air-water heat exchanger 13 is connected to a combined gas/steam plant, in which it acts as a water boiler for a secondary Rankine cycle.At the top of the system an air-water heat exchanger 13 is provided. lt is arranged to receive the air flow output 15 from the turbine unit and to recover thermal energy from the air. The air-water heat exchanger 13 is connected to a combined gas / steam plant, in which it acts as a water boiler for a secondary Rankine cycle.

The inlet air 16 is first accelerated in the compressor 8, driven by the rotating shaft 7 output from the turbine unit 6, which increases the pressure and temperature of the air. The air then passes to the interior of the thermally conductive heating member 3, where the thermal energy from the collected solar energy is transferred to the air flow by means of the arrangement of the thermally conductive heating member 3.The inlet air 16 is first accelerated in the compressor 8, driven by the rotating shaft 7 output from the turbine unit 6, which increases the pressure and temperature of the air. The air then passes to the interior of the thermally conductive heating member 3, where the thermal energy from the collected solar energy is transferred to the air flow by means of the arrangement of the thermally conductive heating member 3.

Sunlight, impinging on the solar energy collecting unit 1, is collected and focused onto the thermally conductive heating member 3, thereby transferring the solar energy as thermal energy to the thermally conductive heating member 3.Sunlight, impinging on the solar energy collecting unit 1, is collected and focused onto the thermally conductive heating member 3, thereby transferring the solar energy as thermal energy to the thermally conductive heating member 3.

The transfer of heat to the air flow causes the volume of the air to increase. The expanding air is forced into the turbine unit 6. 10 15 8 The turbine unit 6, operated by the expanding fluid, e.g. air, drives the gear box 10 that adapts the rotational speed and torque to the electrical generator 9. The gear box 10 enables the generator 9 to be disconnected from the rotating shaft 7.The transfer of heat to the air flow causes the volume of the air to increase. The expanding air is forced into the turbine unit 6. 10 15 8 The turbine unit 6, operated by the expanding fluid, e.g. air, drives the gear box 10 that adapts the rotational speed and torque to the electrical generator 9. The gear box 10 enables the generator 9 to be disconnected from the rotating shaft 7.

Electrical energy generated by the system may be stored in the battery unit 11 and used later on, e.g. when required by the power grid 12 dynamics.Electrical energy generated by the system may be stored in the battery unit 11 and used later on, e.g. when required by the power grid 12 dynamics.

While the present invention has been illustrated and described in detail in the appended drawings and the foregoing description, such illustration and description are to be considered illustrative or exemplifying and not restrictive; the present invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practising the claimed invention, from a study of the drawings, the disclosure, and the appended claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.While the present invention has been illustrated and described in detail in the appended drawings and the foregoing description, such illustration and description are to be considered illustrative or exemplifying and not restrictive; the present invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims (9)

10 15 20 25 30 35 Claims10 15 20 25 30 35 Claims 1. A system for producing electrical energy based on solar energy, the system comprising: a solar energy collecting unit for collecting solar energy; a thermally conductive heating member arranged to receive a fluid flow and permit passage of the fluid flow through the interior of the thermally conductive heating member, wherein the solar energy collecting unit is adapted to transfer collected solar energy to the thermally conductive heating member, and the thermally conductive member is arranged to transfer thermal energy from the collected solar energy to the fluid flow when it passes through the interior of the thermally conductive heating member by means of at least one thermal heat transferring element comprised in the interior of the thermally conductive heating member; a turbine unit arranged to receive and being operable directly by the fluid flow output from the thermally conductive member; and an electrical generator connected to the turbine unit and being operable by the turbine unit for production of electrical energy.A system for producing electrical energy based on solar energy, the system comprising: a solar energy collecting unit for collecting solar energy; a thermally conductive heating member arranged to receive a fluid fl ow and permit passage of the fluid fl ow through the interior of the thermally conductive heating member, wherein the solar energy collecting unit is adapted to transfer collected solar energy to the thermally conductive heating member, and the thermally conductive member is arranged to transfer thermal energy from the collected solar energy to the fluid flow when it passes through the interior of the thermally conductive heating member by means of at least one thermal heat transferring element comprised in the interior of the thermally conductive heating member ; a turbine unit arranged to receive and be operable directly by the fl uid flow output from the thermally conductive member; and an electrical generator connected to the turbine unit and being operable by the turbine unit for production of electrical energy. 2. A system according to claim 1, wherein the at least one thermal heat transferring element comprises at least one surface in thermal contact with the fluid flow arranged to transfer thermal energy to the fluid flow.A system according to claim 1, wherein the at least one thermal heat transferring element comprises at least one surface in thermal contact with the fl uid flow arranged to transfer thermal energy to the fluid flow. 3. A system according to claim 1 or 2, wherein the at least one thermal heat transferring element comprises a plurality of flanges and/or fins.A system according to claim 1 or 2, wherein the at least one thermal heat transferring element comprises a plurality of flanges and / or fins. 4. A system according to claim 1, 2 or 3, wherein the solar energy collecting unit comprises a plurality of reflectors adapted to direct sunlight towards the thermally conducting heating member.A system according to claim 1, 2 or 3, wherein the solar energy collecting unit comprises a plurality of reflectors adapted to direct sunlight towards the thermally conducting heating member. 5. A system according to any one of claims 1-4, further comprising a compressor unit adapted to compress the fluid flow prior to being input into the thermally conducting heating member and/or prior to being input into the turbine unit.A system according to any one of claims 1-4, further comprising a compressor unit adapted to compress the fluid fl ow prior to being input into the thermally conducting heating member and / or prior to being input into the turbine unit. 6. A system according to any one of claims 1-5, wherein the fluid flow comprises air from the surroundings of the system. 10 10A system according to any one of claims 1-5, wherein the fluid flow comprises air from the surroundings of the system. 10 10 7. A system according to any one of claims 1-6, further comprising a gear box unit via which the turbine unit and the electrical generator are connected.A system according to any one of claims 1-6, further comprising a gear box unit via which the turbine unit and the electrical generator are connected. 8. A system according to any one of claims 1-7, further comprising a heat exchanger adapted to recover thermal heat energy from the fluid flow output from the turbine unit.A system according to any one of claims 1-7, further comprising a heat exchanger adapted to recover thermal heat energy from the fl uid fl ow output from the turbine unit. 9. A system according to any one of claims 1-8, further comprising an electrical energy storage system for storing electric energy generated by the electrical generator.A system according to any one of claims 1-8, further comprising an electrical energy storage system for storing electric energy generated by the electrical generator.
SE1200019A 2012-01-05 2012-01-05 Thermodynamic solar power plant based on gas turbine with flexible electrical dynamics against the power grid SE1200019A1 (en)

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SE1200019A SE1200019A1 (en) 2012-01-05 2012-01-05 Thermodynamic solar power plant based on gas turbine with flexible electrical dynamics against the power grid

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