The influence of calcite loading on producer gas composition and tar concentration of radiata pine pellets in a dual fluidised bed steam gasifier

► H2/CO can be varied from 0.9 to 4.2 by increasing calcite loading and S/B at 100% calcite loading. ► Change in calcite loading provides flexibility to meet required H2/CO in target applications. ► Total tar concentration decreased exponentially from 5.0 to 0.7 g/Nm3 with the calcite loading. ► Tar reduction from 0% to 50% calcite loading was found to be higher than that from 50% to 100% loading.