The entrained flow
reactor (EFR) is frequently applied to analyze
the reactivity of pulverized coal char under controlled atmospheres
of temperature and partial pressure. The rate constants for a specific
char gasification model derived from EFR tests may be subject to errors
due to the differences between the target and actual conditions caused
by (i) the shorter reaction time because of the thermal entry region
if not preheated to the target temperature, (ii) lower particle temperatures
because of endothermic reactions, and (iii) lower partial pressure
of reactants consumed. In this study, coal char was gasified using
CO2 and H2O in a pressurized EFR, and the validity
of the rate constants for a char conversion model based on the target
reaction conditions was assessed using computational fluid dynamics
(CFD). Then, an analytical method was proposed to determine the effective
reaction time, particle temperature, and reactant partial pressure
for derivation of rate constants only using the experimental data.
The predicted char conversion ratios adopting the modified rate constants
showed good agreement with the measured data under various conditions.
The method can be applied to deriving rate constants for a particular
char conversion model and to estimating the uncertainties of a particular
EFR design and test conditions.
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