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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{
  "DOI": "10.1016/j.solener.2019.12.029", 
  "language": "eng", 
  "author": [
    {
      "family": "Thibaut Esence"
    }, 
    {
      "family": "Hadrien Benoit"
    }, 
    {
      "family": "Damien Poncin"
    }, 
    {
      "family": "Michael Tessonneaud"
    }, 
    {
      "family": "Gilles Flamant"
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2019, 
        12, 
        21
      ]
    ]
  }, 
  "abstract": "<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>", 
  "title": "A shallow cross-flow fluidized-bed solar reactor for continuous calcination processes", 
  "type": "article-journal", 
  "id": "3703370"
}
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