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Type: Journal article
Title: Particle residence time distributions in a vortex-based solar particle receiver-reactor: the influence of receiver tilt angle
Author: Davis, D.
Troiano, M.
Chinnici, A.
Saw, W.
Lau, T.
Solimene, R.
Salatino, P.
Nathan, G.
Citation: Solar Energy, 2019; 190:126-138
Publisher: Elsevier
Issue Date: 2019
ISSN: 0038-092X
Statement of
Dominic Davis, Maurizio Troiano, Alfonso Chinnici, Woei L. Saw, Timothy Lau, Roberto Solimene, Piero Salatino, Graham J. Nathan
Abstract: We present the first experimental assessment of the influence of receiver tilt angle on the particle residence time distribution (RTD) of a two-phase solar particle receiver. The tracer pulse response method is used to measure the particle RTD within a laboratory-scale vortex-based solar particle receiver, with the particle phase itself used as the tracer. The experimental parameters of particle size, transporting gas inlet velocity and a range of receiver tilt angles – spanning 180° from vertically upward to downward facing – were systematically varied to determine the influence of key controlling parameters on the particle RTD within the receiver. It was found that the Stokes number of the two-phase flow evaluated at the receiver outlet, Sk(out), has a controlling influence on the residence time and that the influence of the receiver tilt angle is significant for large particles (Sk(out) > 10) but weak for small particles (Sk(out) ~ 1). This implies that it is preferable to operate tower-mounted systems (i.e. with downward facing receiver tilt angles) with Sk(out) ~ 1. Furthermore, a preliminary scale-up assessment suggests that the influence of tilt angle on the residence time of particles 200 µm and smaller will be insignificant for a nominal 50 MW-scale receiver, which will provide flexibility in the design of industrial-scale devices. Finally, the residence time behaviour for the range of tilt angles assessed can be well described by an analytical compartment model consisting of a small plug flow reactor, followed by two continuously-stirred tank reactors in parallel with a second plug flow reactor.
Keywords: Solar particle receiver; vortex flow; residence time; RTD; tilt angle; CST
Rights: © 2019 International Solar Energy Society. Published by Elsevier Ltd. All rights reserved.
RMID: 0030132748
DOI: 10.1016/j.solener.2019.07.078
Appears in Collections:Mechanical Engineering publications

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