OCR Text |
Show 3.4. Fuels Table 1 provides information on all 33 fuels for which standardized ignition and/or burnout time data were sought. In toto, 20 pulverized fuels (Table 1A) were test-burned in the plane flame furnace: (a) 12 bituminous coals of variable (factor of 6) ASTM proximate volatile matter content and near-constant ash, moisture, and reactivity (weight-loss in air at 500°C [15]); (b) 2 lignite coals of variable (factor of 3) reactivity (Montana-high; Texas-low) and near-constant volatile matter, ash, and moisture; (c) 3 chars from the same parent coal of variable (factor of 4) volatile matter and near-constant ash, moisture, and reactivity, and (d) 3 chars from different coals with variable (factor of 3) volatile matter and near-constant ash, moisture, and reactivity. The solid fuels were supplied either by The Pennsylvania State University Coal Research Section Coal Sample and Data Bank or by corporate sponsors. In toto, 11 neat and water-slurried pulverized coal fuels (Table IB) were test-burned in the multiphase fuel combustor: (a) 7 neat bituminous coals of variable (factor of 6) volatile matter and near-constant ash and moisture and (b) 4 coal-water slurry fuels of variable (factor of 2) volatile matter and near-constant ash, parent coal moisture, and slurry moisture (coal loading). The slurries and slurry-coal precursors were supplied by corporate sponsors. In toto, 2 simulated coal volatiles (Table 1C) from pulverized coal (dry) or coal-water slurries (moist) were test-burned in the gaseous flat flame burner: (a) high-volatile-bituminous (Pittsburgh) and (b) lignite (Montana). Coal volatiles fuels were produced by mixing the components together from compressed gas cylinders prior to combustion. The relative concentrations of the constituent gases in the simulated coal volatiles were estimated from the pyrolysis literature [16-19]. 22-13 |