MODELING CHAR OXIDATION AS A FUNCTION OF PRESSURE ...
MODELING CHAR OXIDATION AS A FUNCTION OF PRESSURE ...
MODELING CHAR OXIDATION AS A FUNCTION OF PRESSURE ...
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Nomenclature<br />
A pre-exponential factor<br />
A1 pre-exponential factor for k1 A1p pre-exponential factor for k1p Ap pre-exponential factor of Kp a coefficient in the discretization equation<br />
Ac pre-exponential factor for the CO/CO2 product ratio<br />
AFR Advanced Fuel Research<br />
<strong>AS</strong>A active surface area<br />
<strong>AS</strong>TM American Society of Testing and Materials<br />
atm atmosphere<br />
B particle dry ash-free burnout<br />
BYU Brigham Young University<br />
b constant term in the discretization equation<br />
C carbon<br />
C oxygen concentration, mol/cm 3<br />
CBA cantilever balance attachment<br />
CBK Carbon Burnout Kinetics model<br />
Cf total gas concentration at film temperature, equal to P/(RTf) CHNS four elements in coal or char: carbon, hydrogen, nitrogen and sulfur<br />
Cg bulk stream oxygen concentration, mol/m 3<br />
Cog same as Cg Cp heat capacity<br />
Cs oxygen concentration at particle surface, mol/cm 3<br />
D diffusivity, cm 2 /sec<br />
D1 macro diffusivity, cm 2 /sec<br />
D2 micro diffusivity, cm 2 /sec<br />
DAB molecular diffusivity, cm 2 /sec<br />
DABf molecular diffusivity at film temperature, cm 2 /sec<br />
De effective diffusivity, cm 2 /sec<br />
DK Knudsen diffusivity, cm 2 /sec<br />
DOE Department of Energy<br />
d same as dp, particle diameter<br />
dp particle diameter<br />
E neighbor in the positive x direction, i.e., on the east side<br />
E activation energy, kcal/mol<br />
E1 activation energy for k1, kcal/mol<br />
E1p activation energy for k1p, kcal/mol<br />
Ea activation energy of adsorption, kcal/mol<br />
activation energy of the CO/CO2 product ratio, kcal/mol<br />
E c<br />
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