Question Two

$($a$)$ Define the following as related to combustion of fuels.

$($i$)$ Combustion

$($ii$)$ Theoretical air

$($iii$)$ Calorific value

$($b$)$ A thermal plant generates electricity for simple lighting systems and uses coal as its

raw material with the following composition by percentage.

$C=90\%,H_2=3\mathrm{.}5\%,O_2=3\mathrm{.}0\%,N_2=1\mathrm{.}0\%$ and $S=0\mathrm{.}5\%.$ The remainder being ash, find

the;

$($i$)$ minimum weight of air required for the combustion of $1$ kg of this fuel.

$($ii$)$ composition of the dry products of combustion by volume.

Assume $50\%$ excess air is supplied. Question Two

$($a$)$ Define the following as related to combustion of fuels.

$($i$)$ Combustion

$($ii$)$ Theoretical air

$($iii$)$ Calorific value

$($b$)$ A thermal plant generates electricity for simple lighting systems and uses coal as its

raw material with the following composition by percentage.

$C=90\%,H_2=3\mathrm{.}5\%,O_2=3\mathrm{.}0\%,N_2=1\mathrm{.}0\%$ and $S=0\mathrm{.}5\%.$ The remainder being ash, find

the;

$($i$)$ minimum weight of air required for the combustion of $1$ kg of this fuel.

$($ii$)$ composition of the dry products of combustion by volume.

Assume $50\%$ excess air is supplied.