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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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    "doi": "10.1016/j.solener.2019.12.029", 
    "description": "<p>A laboratory-scale solar reactor prototype dedicated to calcination processes of non-metallic mineral particles is<br>\ntested and characterized. The prototype consists of an indirect heating shallow cross-flow fluidized-bed reactorreceiver.<br>\nIt is composed of 4 compartments in series in which the particles are thermally treated with solar power<br>\nin order to drive the endothermic calcination reaction. The particles are fluidized in the reactor with preheated<br>\nair and are heated up to 800 &deg;C through the front wall of the reactor receiving the concentrated solar flux (about<br>\n200 kW/m2). The tests are carried out at the 1-MW Odeillo&rsquo;s solar furnace (France). The thermal decomposition<br>\nof a continuous stream of 9.4 kg/h of dolomite (CaMg(CO3)2) is investigated in this paper. The half decomposition<br>\nof dolomite (CaMg(CO3)2 &rarr; CaCO3 + MgO + CO2) is performed with a degree of conversion of 100%.<br>\nThe complete decomposition of dolomite (CaMg(CO3)2 &rarr; CaO + MgO + 2CO2) is not reached because, with<br>\nrespect to the CO2 partial pressure in the reactor, the temperature of particles is not high enough to decompose<br>\nthe calcium carbonate. The calculated thermochemical efficiency (i.e. the energy absorbed by the endothermic<br>\ncalcination reaction compared to the solar energy provided to the system) is 6.6%. This low efficiency is neither<br>\nsurprising nor critical since the reactor design was not optimised with respect to energy efficiency but designed<br>\nto the control of particle flow and front wall solar flux distribution. A numerical model considering the 4<br>\ncompartments of the reactor as 4 ideal continuous stirred tank reactors in series is developed. The model accounts<br>\nfor the mass and the energy balances, as well as the reaction kinetics of the half decomposition of<br>\ndolomite. The model gives consistent results compared to the experimental data. These results are a proof of<br>\nconcept of continuous calcination reaction using concentrated solar energy in a cross-flow fluidized-bed reactor.</p>", 
    "language": "eng", 
    "title": "A shallow cross-flow fluidized-bed solar reactor for continuous calcination processes", 
    "license": {
      "id": "CC-BY-4.0"
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        }, 
        "title": "High Temperature Solar-Heated Reactors for Industrial Production of Reactive Particulates", 
        "acronym": "SOLPART", 
        "program": "H2020", 
        "funder": {
          "doi": "10.13039/501100000780", 
          "acronyms": [], 
          "name": "European Commission", 
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    "keywords": [
      "Solar heat in industrial process", 
      "Calcination", 
      "Cross-flow fluidized bed", 
      "Experiment", 
      "Modelling"
    ], 
    "publication_date": "2019-12-21", 
    "creators": [
      {
        "affiliation": "CNRS PROMES", 
        "name": "Thibaut Esence"
      }, 
      {
        "affiliation": "CNRS PROMES", 
        "name": "Hadrien Benoit"
      }, 
      {
        "affiliation": "CNRS PROMES", 
        "name": "Damien Poncin"
      }, 
      {
        "affiliation": "CNRS PROMES", 
        "name": "Michael Tessonneaud"
      }, 
      {
        "affiliation": "CNRS PROMES", 
        "name": "Gilles Flamant"
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    ], 
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