(180an) Removal of Sulfur Compounds From Solvent Extracts of Low Rank Coal

Recently, Korea and Japan are investigating low-rank coal upgrading technology using solvent extraction. The solvent extraction is the technology to separate only combustible matters from low-rank coal and has been known as environmenatlly sound and cost effective. Furthermore, the upgraded coal can be directly used in a gas turbine since it does contain trace-amount of ash. However, there is still small amount of sulfur (100 to 1000 ppmw) exist in the upgraded coal which might cause corrosion in blades and boiler component. Therefore, the remained sulfur need to be removed for improving coal quality. Korea Institute of Energy Research (KIER) has been recently developed desulfurization sorbent and the process that can be directly attached to the solvent extraction process. Because the desulfurization condition is identical with the extraction process, no further energy consumption is required to obtain low sulfur coal. The performance of the developed sorbent in a lab-scale experimental apparatus at various condtions will be presented.