Dewatering Dilute Fine Coal/Water Slurries to Produce Coal/Water Fuel

摘要

Vendor assisted concentration studies were conducted on hydrothermally treated low-rank coal water (LRCW) slurries using a hydroclone, centrifuge, plate and frame filter, belt pressure filter, electrofiltration techniques and electroacoustic dewatering. The release of inorganic constituents into the process water, release of tar, and reduction of coal particle size due to pilot-scale hydrothermal processing all contributed to the difficulty in separating the process water from the solid products. The centrifuge was determined to be the best commercially available method. After purchasing a centrifuge, optimization studies were conducted to determine the best operating conditions for concentrating hydrothermally treated LRCW slurries. 6 refs., 8 figs., 4 tabs. (ERA citation 11:037354)