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Главная Архив Оргкомитет Будущие конференции American Society of Thermal and Fluids Engineering

DESIGN AND EXPERIMENTAL TESTING OF A CARBON FEEDER FOR A SOLAR THERMAL RECEIVER

Lohengrin Van Belle
KU Leuven, Solar Thermal Technology Laboratory (STTL), 2860, Sint Katelijna Waver, Belgium

Sven Van Rompay
KU Leuven, Solar Thermal Technology Laboratory (STTL), 2860, Sint Katelijna Waver, Belgium

M. Helal Uddin
University of Minnesota Duluth, Mechanical and Industrial Engineering, 55812 Duluth, Minnesota

Nesrin Ozalp
University of Minnesota Duluth

Jozef Vleugels
KU Leuven, Materials Engineering Department, 3001 Leuven, Belgium

DOI: 10.1615/TFEC2018.env.024512
pages 763-777


Ключевые слова: Solar receiver, Feeder design, Carbon, Heat transfer

Аннотация

The addition of carbon particles into a solar thermal receiver or reactor enhances the heat transfer and lowers the reactor wall temperature by creating a gas/particle cloud of radiation absorbers and emitters within the reactor. Injection of carbon also serves to maintain the high temperature process heat centralized within the particle-gas cloud, and to provide additional nucleation sites for chemical reactions. However, the selection and design of a feeding apparatus for a solar receiver or reactor requires thorough investigation. In this study, a design methodology is provided for a hopper featuring a screw type feeder. An analytical solution of the force balance within the hopper is provided to determine the bottom pressure of the carbon powder on the screw feeder and to give an estimation of the required screw speed. The designed feeder was tested at various rotational speeds to obtain a steady mass flowrate of carbon. It was observed that an induced vibration mechanism helps to provide a continuous flowrate. The direct effect of carbon addition on the heat transfer in a solar receiver was experimentally investigated. The results show that carbon addition lowered the average gas temperature difference at the reactor front and back sides of the receiver by about 28% which facilitated a more uniform gas temperature distribution inside the solar reactor. It was also experimentally observed that the overall reactor wall temperature dropped by 26%.

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