The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Akiba Segal - One of the best experts on this subject based on the ideXlab platform.
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Simulation of an integrated Steam Generator for solar tower
Solar Energy, 2012Co-Authors: Rami Ben-zvi, Michael Epstein, Akiba SegalAbstract:Abstract Optical and thermal simulation of a new solar tower Steam Generator is presented. The Steam Generator, placed on top of a solar tower, has two integrated receivers, external for boiling the Steam and a cavity for its superheating. These two parts of the solar Steam Generator are facing different sections in a surrounding heliostat field and therefore can be operated independently. The evaporation part is shaped as an external cylindrical receiver which creates a cavity with an aperture for the superheating part. This novel arrangement allows high optical and thermal efficiencies. This concept of the integrated solar Steam receiver is illustrated through a modeling of a large-scale plant producing superheated Steam at 550 °C and pressure of 150 bars. The decoupling of the Steam superheating part from the evaporation makes the system more economical, easy and safe to operate.
Rami Ben-zvi - One of the best experts on this subject based on the ideXlab platform.
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Simulation of an integrated Steam Generator for solar tower
Solar Energy, 2012Co-Authors: Rami Ben-zvi, Michael Epstein, Akiba SegalAbstract:Abstract Optical and thermal simulation of a new solar tower Steam Generator is presented. The Steam Generator, placed on top of a solar tower, has two integrated receivers, external for boiling the Steam and a cavity for its superheating. These two parts of the solar Steam Generator are facing different sections in a surrounding heliostat field and therefore can be operated independently. The evaporation part is shaped as an external cylindrical receiver which creates a cavity with an aperture for the superheating part. This novel arrangement allows high optical and thermal efficiencies. This concept of the integrated solar Steam receiver is illustrated through a modeling of a large-scale plant producing superheated Steam at 550 °C and pressure of 150 bars. The decoupling of the Steam superheating part from the evaporation makes the system more economical, easy and safe to operate.
Domingo Santana - One of the best experts on this subject based on the ideXlab platform.
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Lifetime analysis of the Steam Generator of a solar tower plant
Applied Thermal Engineering, 2019Co-Authors: P.a. González-gómez, Jesús Gómez-hernández, Javier Villa Briongos, Domingo SantanaAbstract:Abstract Solar tower plants are pushed to operate with fast start-ups and/or load changes to increase their dispatchability and competitiveness. However, this operation mode decreases the lifetime on components like the Steam Generator due to fatigue damage. Moreover, the high operating temperatures typical of solar tower plants also lead to creep damage, which it is combined with fatigue. Both damage mechanisms may lead to a dramatic reduction of the Steam Generator lifetime, compromising the power plant economic viability. In this work the lifetime of the Steam Generator of a solar tower plant is investigated. For that purpose, an elastic-plastic approach is used to consider the material cyclic hardening. The results show that the Steam Generator formed by shell-and-tube heat exchangers can operate during 25 years with temperature change rates up to 150 °C/h, assuming 300 start-ups per year. The most critical point is the superheater head-nozzle junction for both intermittent and continuous operation regimes. An optimization of the superheater head thickness is performed to maximize its lifetime in both regimes. Finally, it can be concluded that temperature change rates higher than 150 °C/h may require a different design of the superheater head and/or a material with better creep-fatigue properties.
Michael Epstein - One of the best experts on this subject based on the ideXlab platform.
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Simulation of an integrated Steam Generator for solar tower
Solar Energy, 2012Co-Authors: Rami Ben-zvi, Michael Epstein, Akiba SegalAbstract:Abstract Optical and thermal simulation of a new solar tower Steam Generator is presented. The Steam Generator, placed on top of a solar tower, has two integrated receivers, external for boiling the Steam and a cavity for its superheating. These two parts of the solar Steam Generator are facing different sections in a surrounding heliostat field and therefore can be operated independently. The evaporation part is shaped as an external cylindrical receiver which creates a cavity with an aperture for the superheating part. This novel arrangement allows high optical and thermal efficiencies. This concept of the integrated solar Steam receiver is illustrated through a modeling of a large-scale plant producing superheated Steam at 550 °C and pressure of 150 bars. The decoupling of the Steam superheating part from the evaporation makes the system more economical, easy and safe to operate.
P.a. González-gómez - One of the best experts on this subject based on the ideXlab platform.
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Lifetime analysis of the Steam Generator of a solar tower plant
Applied Thermal Engineering, 2019Co-Authors: P.a. González-gómez, Jesús Gómez-hernández, Javier Villa Briongos, Domingo SantanaAbstract:Abstract Solar tower plants are pushed to operate with fast start-ups and/or load changes to increase their dispatchability and competitiveness. However, this operation mode decreases the lifetime on components like the Steam Generator due to fatigue damage. Moreover, the high operating temperatures typical of solar tower plants also lead to creep damage, which it is combined with fatigue. Both damage mechanisms may lead to a dramatic reduction of the Steam Generator lifetime, compromising the power plant economic viability. In this work the lifetime of the Steam Generator of a solar tower plant is investigated. For that purpose, an elastic-plastic approach is used to consider the material cyclic hardening. The results show that the Steam Generator formed by shell-and-tube heat exchangers can operate during 25 years with temperature change rates up to 150 °C/h, assuming 300 start-ups per year. The most critical point is the superheater head-nozzle junction for both intermittent and continuous operation regimes. An optimization of the superheater head thickness is performed to maximize its lifetime in both regimes. Finally, it can be concluded that temperature change rates higher than 150 °C/h may require a different design of the superheater head and/or a material with better creep-fatigue properties.
