Impacts of Burning High Sulphur Fuels in Lime Kilns, 2009 TAPPI Engineering, Pulping, Environmental Conference

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Due to high costs of natural gas and fuel oil in recent years, many kraft pulp mills use lower cost fuels with high sulphur contents in lime kilns. Depending on the total sulphur input to the kiln, burning high sulphur fuels in lime kilns may increase SO2 emissions, decrease lime availability and reactivity, and aggravate ring formation. The sulphur absorbed in the product lime ends up as Na₂SO4 deadload in the liquor cycle, which is reduced to Na2S in the recovery boiler leading to an increase in liquor sulphidity. The effects, however, are manageable.