Solid biofuel combustion or electrification for limestone calcination: Effects on quicklime surface microstructure

• A detailed description of ash-limestone interactions involving ash from biomass coal. mechanistic infiltration is provided. Comparative quicklime microstructure electrically heated calcination. Quicklime coarsening and reduced Ca-levels for both tested ashes. salt melt was suggested to cause the with olive pomace ash. Net CO 2 emissions production can be by introducing renewable solid fuels or sustainably produced electricity heating process. This paper reports results a study examining effects new heat sources on surface reaction products microstructure. Limestone 1100 °C 1350 in high atmosphere under three conditions: i) an mixture representing conventional coal biofuel (olive pomace); ii) ash, iii) no The ash-quicklime interfaces samples were analyzed elemental composition using SEM-EDX. Multi-component chemical equilibrium calculations used assess stable phases interface. Coal-olive resulted microstructure; this effect less severe compared that pure indicated potassium bound Si- Al-rich phases. Exposure potassium-rich difference most obvious at 1,350 °C, probably result intrusion melt. For limestone without showed enhanced sintering porosity higher temperature, agreement previous studies. Interface reactions coarsening, here apparent case pomace, could problematic industrial since they may contribute decreased available CaO reactivity.