Journal article Open Access

A shallow cross-flow fluidized-bed solar reactor for continuous calcination processes

Thibaut Esence; Hadrien Benoit; Damien Poncin; Michael Tessonneaud; Gilles Flamant


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        <foaf:name>Michael Tessonneaud</foaf:name>
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    <dct:title>A shallow cross-flow fluidized-bed solar reactor for continuous calcination processes</dct:title>
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    <dcat:keyword>Solar heat in industrial process</dcat:keyword>
    <dcat:keyword>Calcination</dcat:keyword>
    <dcat:keyword>Cross-flow fluidized bed</dcat:keyword>
    <dcat:keyword>Experiment</dcat:keyword>
    <dcat:keyword>Modelling</dcat:keyword>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2019-12-21</dct:issued>
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    <dct:description>&lt;p&gt;A laboratory-scale solar reactor prototype dedicated to calcination processes of non-metallic mineral particles is&lt;br&gt; tested and characterized. The prototype consists of an indirect heating shallow cross-flow fluidized-bed reactorreceiver.&lt;br&gt; It is composed of 4 compartments in series in which the particles are thermally treated with solar power&lt;br&gt; in order to drive the endothermic calcination reaction. The particles are fluidized in the reactor with preheated&lt;br&gt; air and are heated up to 800 &amp;deg;C through the front wall of the reactor receiving the concentrated solar flux (about&lt;br&gt; 200 kW/m2). The tests are carried out at the 1-MW Odeillo&amp;rsquo;s solar furnace (France). The thermal decomposition&lt;br&gt; of a continuous stream of 9.4 kg/h of dolomite (CaMg(CO3)2) is investigated in this paper. The half decomposition&lt;br&gt; of dolomite (CaMg(CO3)2 &amp;rarr; CaCO3 + MgO + CO2) is performed with a degree of conversion of 100%.&lt;br&gt; The complete decomposition of dolomite (CaMg(CO3)2 &amp;rarr; CaO + MgO + 2CO2) is not reached because, with&lt;br&gt; respect to the CO2 partial pressure in the reactor, the temperature of particles is not high enough to decompose&lt;br&gt; the calcium carbonate. The calculated thermochemical efficiency (i.e. the energy absorbed by the endothermic&lt;br&gt; calcination reaction compared to the solar energy provided to the system) is 6.6%. This low efficiency is neither&lt;br&gt; surprising nor critical since the reactor design was not optimised with respect to energy efficiency but designed&lt;br&gt; to the control of particle flow and front wall solar flux distribution. A numerical model considering the 4&lt;br&gt; compartments of the reactor as 4 ideal continuous stirred tank reactors in series is developed. The model accounts&lt;br&gt; for the mass and the energy balances, as well as the reaction kinetics of the half decomposition of&lt;br&gt; dolomite. The model gives consistent results compared to the experimental data. These results are a proof of&lt;br&gt; concept of continuous calcination reaction using concentrated solar energy in a cross-flow fluidized-bed reactor.&lt;/p&gt;</dct:description>
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