Rheology of Coal Slurries at Process Temperatures and Pressures

摘要

In support of the SRC-I Demonstration Plant Project, rheological and density measurements have been made on recycle solvent and slurries made with Kentucky No. 9 coal at a 1.6 solvent-to-coal ratio. The measurements were made at temperatures of 300 to 758 exp 0 K and pressures of 0.1, 1.1, 7.0, and 17.3 MPa. Reaction-time effects were studied by changing the residence time in the preheater above a given temperature. Results show that the solvent behaved as a Newtonian fluid, while the slurry behaved in a non-Newtonian pseudoplastic manner dependent on temperature and reaction time. The viscosity of the slurry increased by over 100 times in the gel region at low reaction times. Also, the slurry density exhibited a more-rapid decrease with temperature in this gel region compared to the region before the reaction began. (ERA citation 08:028827)