The temperature profiles of the combustion system during the
combustion of Miscanthus pellets of average size (Table 2) are
shown in Fig. 4. The system reached high temperatures during
volatile gas combustion, helped by introducing more air into the
system resulting in better turbulence above the fuel bed. The rate of
char mass loss was observed to be slow compared to the rate of
volatile combustion, by almost four times. The reason might be low
supply of air to char combustion, since the system's air supply is
purely dependent on natural draught. Ash formation and agglomeration
on the outer layer of fuel particles blocks the pores which
also effects on char combustion rate [15]. The total combustion is
uninterrupted and good fuel combustion behaviour has been
observed.