Abstract
By using O2 pulse reaction method which is able to measure isothermal burn-off kinetics under successive O2 pulse injection and product gas analysis, the burn-off tests have been performed for size-graded fraction (53-74μm) of nine types of pulverized coals at 600°C in the temperature range of chemical reaction rate-determining step.The results show that the pulse combustion progresses with conversions to CO and CO2 and volatile oxidation and the traditional characteristics of these reaction rates with burn-off change according to coal type.In over all burn-off, the mean conversions rate constant to CO2 and the ratio of both mean conversion rate constants are found to have good correlation with the coal parameter of [moisture (%, af)] 2/3/fuel ratio.This parameter also correlates to unburned ratios of pulverized coals in an actual boiler.
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