Combustion and gasification are the fundamental
process
es of coal utilization, and t
he research of these
applications has been continuously progressing. Numerical
modelling is one of the methodologies that also has significant
advancement
, due to the progress of computational engineering
and also considering economic impact. This paper
is a part of
the numerical developments
on
the coal combustion and
gasification that introduces a new approach by which a single
coal particle model has been developed and used to investigate
those
process
es. CFD (Computational Fluid Dynamics
)
techniques with
an
Eddy Break Up (EBU) model and also with
a set of kinetics parameter reactions are used in the study
.
However, defining the chemical reactions
is crucial for the
model development
. Seven reactions for coal combustion and
additional six reactions for
ga
sification are investigated
. It is
identified that the best fit kinetic parameter value for the pre-
exponent factor (
A
) of
R2
and
R3
, while comparing with the
experimental results, is 20 and 1000, respectively
. Finally, these
values are implemented in
to the model of both coal particle
combustion and gasification for investigation. The results of the
simulation show that the H
2
and CH
4
products from the
gasification are significantly higher than those from the
combustion. The maximum mole fraction value of
CO
products
in combustion is ~ 1.5 times higher than in gasification at
an
air
condition, which is unexpected. However, CO production lasted
longer than ~ 200 ms at O
2
condition below than 21% in the coal
gasification, which resulted in more CO production. The
se
results clear
ly identify the process of coal combustion and
gasification. Th
is particle model can thus be considered for
further investigation for various coal combustion and
gasification applications