Combustion time as a function of particle diameter

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Combustion time as a function of particle diameter
Combustion time T = K × ( D )^1.5
D : diameter of coal particle
K : constant characteristics coal quality low for bituminous coal high for pet coke
” decrease with volatile material increase depending on coal type ”
That’s why we maintain high resdual for bituminous coal and low residual for pet coke ( pet coke has low volatile material )
The faster the combustion are gased are removed and replaced by fresh air ” hot secretary air ” the faster the coal particle burn ,
A relative velocity between combustion air and coal particle is required , this need a higher flam momentum with a high primary air Velocity and low primary air %