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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NUMERICAL ANALYSIS OF PACKED BED REACTION OF CALCIUM HYDROXIDE PELLETS FOR THERMOCHEMICAL ENERGY STORAGE

Get access (open in a dialog) DOI: 10.1615/IHTC16.nee.022952
pages 7609-7616

Résumé

A packed bed reactor's performance for thermochemical energy storage (TCES) using a calcium hydroxide/calcium oxide/water (Ca(OH)2/CaO/H2O) system was investigated numerically. The effects of thermal conductivity of a packed bed filled with Ca(OH)2 pellets on reaction conversion, bed temperature, heat storage rate and heat storage density during Ca(OH)2 dehydration were studied. First, a numerical analysis model for dehydration in the reactor was developed and its validity was evaluated by comparison with experimental data. Second, the effects of thermal conductivity of the bed were investigated using the numerical model. The results of numerical analysis showed that higher thermal conductivity of the reactor bed facilitates reaction conversion and increases the temperature where dehydration proceeds at the center of the reactor. It is predicted that a thermal conductivity of 5.0 W m−1 K−1 leads to 3.8 times as much as the maximum heat storage rate in the case of k = 0.1 W m−1 K−1. The effect of thermal conductivity on the enhancement in the heat storage rate was shown numerically.