Deposit formation in oxyfuel‐driven cement plants – Study on the safe implementation of CCUS technologies in the cement industry
Carlos Jacome‐Rincon, Sebastián Díaz‐Prieto, Oliver Maier, Christian Pritzel, Manuela S. KillianAbstract
Ring and build‐up formation in cement kiln systems is a persistent operational challenge, with spurrite, Ca 5 (SiO 4 ) 2 CO 3 , being the most relevant deposit‐forming mineral upstream of the kiln inlet. Its occurrence is expected to intensify under oxyfuel combustion due to the elevated CO 2 partial pressures inherent to this carbon capture technology. In this study, a laboratory method referred to as the stirrer test was developed to investigate spurrite formation in chlorine‐doped industrial raw meal under controlled CO 2 atmospheres and oxyfuel‐relevant temperatures. Samples were treated between 850 and 1000 °C and characterised by XRD combined with Rietveld refinement. Spurrite formation peaked at 44.7 wt.% for the 1.0 wt.% Cl sample at 900 °C and was fully decomposed at 1000 °C. Deposit fragments extracted from the reactor consisted of 73 wt.% spurrite, confirming local phase enrichment as the primary driver of build‐up formation. The results validate the stirrer test as a practical laboratory tool for assessing deposit formation risks relevant to future oxyfuel cement plant operation.