Journal
RENEWABLE ENERGY
Volume 183, Issue -, Pages 41-50Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.10.083
Keywords
Solar energy; Sliding-bed particle receiver; Flow control; Structural design
Funding
- Zhe-jiang Provincial Natural Science Foundation [LR20E060001]
- National Natural Science Foundation of China [51776186]
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A novel impeded flow particle receiver, named sliding-bed receiver, was introduced in this study, utilizing friction and gate valves as obstacles. Experimental results showed that the outlet particle temperature and efficiency reached 847 degrees C and 77.2% under a 4kW solar simulator. Through an optical and thermal coupling model, higher particle temperature and efficiency can be achieved under higher incident power.
Various impeded flow particle receivers were proposed to prolong the particle residence time but always faced the risk of thermal deterioration and the difficulty of real-time particle velocity control. Herein, we reported a novel impeded flow particle receiver to solve above problems and further have the potential to control the particle velocity distribution, which could provide a heat source with better stability, better uniformity and higher temperature for subsequent thermal power generation and other thermal applications. In this receiver, the friction along the path and the gate valves at outlet act as the obstruction structures to allow the particles to move slowly and controllably in the form of a sliding-bed, which is why we call this receiver a sliding-bed receiver. The sliding-bed receiver's structural validity and operational characteristics at different working conditions were detailly investigated with both experimental and numerical methods. Experimental results showed that the outlet particle temperature and efficiency could reach 847 degrees C and 77.2% under a solar simulator of 4 kW. An optical and thermal coupling model was developed and revealed an improved particle temperature of 1350 degrees C and efficiency of 82% under higher incident power. The effects of the effects of the incident power distribution, the particle velocity distribution and the quartz glass on aperture on the receiver performance were detailly analyzed, which could also help optimize the design and operation of other particle receivers such as free-falling particle receivers. (C) 2021 Published by Elsevier Ltd.
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