We designed and tested a scaleable solar multitube rotary kiln to effect the endothermic calcination reaction at above . The indirect heating reactor prototype processes limestone particles, producing high purity lime of any desired reactivity and with a degree of calcination exceeding 98%. The reactor’s efficiency, defined as the enthalpy of the calcination reaction at ambient temperature divided by the solar energy input, reached 30%–35% for solar flux inputs of about and for quicklime production rates up to . The use of concentrated solar energy in place of fossil fuels as the source of process heat has the potential of reducing by 20% emissions in a state-of-the-art lime plant and by 40% in a conventional cement plant.
Multitube Rotary Kiln for the Industrial Solar Production of Lime
Meier, A., Bonaldi, E., Cella, G. M., and Lipinski, W. (April 29, 2005). "Multitube Rotary Kiln for the Industrial Solar Production of Lime." ASME. J. Sol. Energy Eng. August 2005; 127(3): 386–395. https://doi.org/10.1115/1.1979517
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