Victorian brown coal has a strong affinity for water. It exhibits high monolayer water capacities (MWC) and nonfreezing water contents (NFW). In electricity generation, a large amount of brown coal is burnt (and CO2 liberated) just to dry the coal. Thus, an understanding of coal-water interactions and how they change during drying is essential for the reduction of CO2 emissions. MWC was measured by equilibration at 15% relative humidity at 30°C. NFW was determined by 1H nuclear magnetic resonance spectroscopy (NMR). These parameters have been correlated with structural characteristics of the same coals (elemental analysis; carboxyl and phenol content as determined by aqueous titration). MWC and NFW were primarily dependent on the carboxylic acid concentration of the coal. Processes which enhance decarboxylation are thus effective in lowering the affinity for water, improving combustion efficiency of Victorian brown coals.
|Number of pages||2|
|Journal||ACS Division of Fuel Chemistry, Preprints of Papers Presented|
|Publication status||Published - 1 Mar 2001|