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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      <creatorName>Thibaut Esence</creatorName>
      <affiliation>CNRS PROMES</affiliation>
      <creatorName>Hadrien Benoit</creatorName>
      <affiliation>CNRS PROMES</affiliation>
      <creatorName>Damien Poncin</creatorName>
      <affiliation>CNRS PROMES</affiliation>
      <creatorName>Michael Tessonneaud</creatorName>
      <affiliation>CNRS PROMES</affiliation>
      <creatorName>Gilles Flamant</creatorName>
      <affiliation>CNRS PROMES</affiliation>
    <title>A shallow cross-flow fluidized-bed solar reactor for continuous calcination processes</title>
    <subject>Solar heat in industrial process</subject>
    <subject>Cross-flow fluidized bed</subject>
    <date dateType="Issued">2019-12-21</date>
  <resourceType resourceTypeGeneral="JournalArticle"/>
    <alternateIdentifier alternateIdentifierType="url"></alternateIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1016/j.solener.2019.12.029</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf"></relatedIdentifier>
    <rights rightsURI="">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
    <description descriptionType="Abstract">&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;</description>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/100010661</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/654663/">654663</awardNumber>
      <awardTitle>High Temperature Solar-Heated Reactors for Industrial Production of Reactive Particulates</awardTitle>
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