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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Experimental investigation of carbon dioxide capture and high-temperature thermal energy storage via metal oxide chemical looping in a 1 kW solar prototype reactor




Abstract

Two-step metal oxide carbonation–calcination chemical looping is a promising approach for solar-driven CO2 capture from flue gases and as a high-temperature thermochemical energy storage system for solar-thermal power plants. The reversible two-step process involves the endothermic calcination of a metal carbonate (e.g. CaCO3, SrCO3) to the metal oxide driven by concentrated solar energy, followed by the exothermic carbonation of the metal oxide to capture CO2 or provide a source of high-temperature heat. A 1 kW solar-driven packed-bed reactor prototype has been designed and built to experimentally evaluate the process. The packed bed of sorbent particles is contained in an annular reaction zone surrounding a solar cavity and heated with concentrated solar radiation via the diathermal cavity wall. Gases are supplied to the reactor via inlet and outlet manifolds and distributed inside the reaction zone with gas distributors. Both reaction steps are conducted in gas flows consisting of mixtures of CO2 and an inert gas component with varying compositions. Reaction rates and extents are determined by controlling the gas flow rates and measuring the changes between inlet and outlet gas compositions. Particle composition, structure, size, and morphology are analyzed before and after chemical looping experiments. The pressure drop across the particle bed and the temperature of the outer reaction zone wall, inlet gas temperature, and outlet gas temperature are measured and controlled. We will present and discuss the reactor design, experimental setup, and most recent experimental results obtained with the prototype reactor.

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