FB Systems  
Distribution of Pyrolysis Products from a Set of Ion-exchanged Victorian Lignite Samples at Elevated Pressures
C Sathe and CZ Li CRC  for Clean Power from Lignite, Melbourne
A set of ion-exchanged samples prepared from Loy Yang lignite were pyrolysed in a wire-mesh reactor at elevated pressures from 1 to 61 bars. The char yields from all the samples did not show considerable sensitivities to changes in pressure at the heating rate of 1000 K s-1. The sensitivities of the tar yields to changes in heating rate and pressure were dependent of the ion-exchanged form of the sample. Analysis of the tar samples showed that the release of larger aromatic ring systems (3 or more fused rings) was greatly affected by increases in pressure for the raw lignite sample. The yields of the larger aromatic ring systems from the Ca-form and Na-form samples were lower than those from the raw lignite sample and were not significantly affected by pressure. The effects of pressure on the pyrolysis product distribution are thought to be mainly due to the changes in the transportation of volatile precursors with pressure.
 
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