Abstract
This report presents operating conditions and results for the six-ton-per-day Solvent Refined Coal (SRC) pilot plant at Wilsonville, Alabama. Three industrially significant coals were processed: (1) a subbituminous Wyomin coal from Amax Coal Company's Belle Ayr Mine (Wyodak Seam), (2) a high volatile Utah bituminous coal from Consolidation Coal Company's Energy Mine (I and J Seam), and (3) a high volatile Indiana bituminous coal from Old Ben Coal Company's No. 1 Mine (Indiana V Seam). The effects of various process variables on SRC yield and quality were determined. These variables included process solvent boiling range, dissolver volume, accumulated solids concentration, and hydrogen sulfide partial pressure. The effects of operating variables on the overall plant solvent inventory balance are also reported. The effectiveness of a distributor plate installed in the dissolver for maintaining dissover solis in a fluidized state is discussed. Several filter aid (precoat) materials were tested. A correlation was developed between the volume of wash solvent used to rinse the filter cake and the amount of ash in SRC. A mathematical model for pressure-leaf filter scaleup was developed from the coal processing data obtained during 1976 and 1977. Centrifugation and antisolvent addition were evaluated as potential alternatives to filtrationmore » for mineral residue separation. Major changes to the solvent and product recovery systems made during 1977 are also discussed.« less
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