High-Temperature Flow Testing and Heat Transfer for a Moving Packed-Bed Particle/sCO2 Heat Exchanger

被引:24
|
作者
Albrecht, Kevin J. [1 ]
Ho, Clifford K. [1 ]
机构
[1] Sandia Natl Labs, Concentrating Solar Technol Dept, POB 5800, Albuquerque, NM 87185 USA
来源
INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2017) | 2018年 / 2033卷
关键词
D O I
10.1063/1.5067039
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Experiments for measuring the heat transfer coefficients and visualization of dense granular flows in rectangular vertical channels are reported. The experiments are directed at the development of a moving packed-bed heat exchanger to transfer thermal energy from solar-heated particles to drive a supercritical carbon dioxide (sCO(2)) power cycle. Particle-wall heat transfer coefficients are found to agree with Nusselt number correlations for plug flow in a parallel plate configuration. The plate spacing and particle properties in the prototype design result in experimentally measured particle-wall heat transfer coefficients of 200 W/m(2)-K at intermediate temperature and are expected to be higher at elevated temperature due to improved packed bed thermal conductivity. The high-temperature (600 degrees C) visualization experiments indicate that uniform particle flow distribution through the vertical channels of a shell-and-plate heat exchanger can be achieved through a mass flow cone particle feeder. Uniform drawdown was experienced for both 77 degrees and 72 degrees feeder angles over a range of particle mass flow rates between 0.05 and 0.175 kg/s controlled by a slide gate to modulate the outlet flow cross-sectional area.
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页数:9
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