Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
REVIEW OF HIGH-TEMPERATURE SOLID PARTICLE RECEIVER/REACTOR CONCEPTS AND MATERIALS
Submission Author:
Juliana Emanuella Gonçalves , SC
Co-Authors:
Annelies Vandersickel
Presenter: Juliana Emanuella Gonçalves
doi://10.26678/ABCM.ENCIT2016.CIT2016-0337
Abstract
Recently solid particles are being considered both as storage medium and heat transfer fluid (HTF) with great potential to improve the performance of concentrated solar power (CSP) technologies. Innovative solar central receiver concepts have been proposed and it was demonstrated they can heat solid particles to temperatures above 1000°C. High temperature solar receivers are furthermore able to drive reversible chemical reactions, which could improve energy storage density and performance in CSP plants. Thermochemical storage systems have the highest energy density compared to any other thermal energy storage. They involve stable energy storage media at near ambient temperature and are able to store energy for as long as the reaction products are kept separately stored. In comparison to other promising reactions, reactions involving solid and gas products have the additional advantage of being easily separable. This paper therefore summarizes the state of the art on high temperature (573-1273 K) solar thermal energy storage based on reversible chemical reactions and in this context relevant particle receiver/reactor designs. The solid circulation concepts within the solar reactor/receiver are classified according to the gas velocity applied, which defines possible gas/solid contacting modes appropriate to carry out chemical reactions. Depending on the heat integration mode into the reaction chamber, solar reactors can be further categorized into indirectly or directly heated reactors/receiver. The operating conditions and desired particle properties are presented. Finally, the paper summarizes the most promising reaction couples suitable to thermochemical heat transfer and storage, describing the advantages and drawbacks of each reaction couple.
Keywords
solid particles, CSP, reversible reactions, themochemical storage, solar receiver, solar reactor
