Electrified externally heated rotary calciner for calcination of cement raw meal

Ron M. Jacob, Jean-Patrick Pinheiro,Lars-Andre Tokheim

HELIYON(2023)

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摘要
The cement industry can reduce its CO2 emissions by electrifying the calciner. It can avoid emissions from fuel combustion and produce pure CO2 from the calcination reaction (CaCO3 -> CaO + CO2) for direct capture. A differential-algebraic equation (DAE) model of an electrified rotary calciner was developed and validated against experimental results. The heat transfer coefficient was around 30 W/(m2K), with the calciner inclined at 15 degrees. This value increased to 80 W/ (m2K) by reducing the inclination to 2 degrees. The rotary calciner for producing 1 Mton/yr clinker with an internal diameter of 5 m needs a length of 485 m to reach a calcination degree of 94 %. The large system size suggests that this calciner may not be suitable for full-scale production. However, it can still be used for small-scale green production of calcined limestone.
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关键词
Electrified calciner,Rotary kiln,CO2 emissions,Scale-up
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