A coal with an ultimate gravimetric analysis of 80% C, 5% H2, 5.4 % O2, 0.63 % N2, 0.89% S and 8.08% Ash is burned in an industrial boiler. Calculate the adiabatic flame temperature with a stoichiometric air supply and determine the impact on the adiabatic flame temperature by varying the air supply from stoichiometric to 300% excess air.

Explain the reasons for the trends observed and how these are used in temperature control using gas recycling

Assume the air and coal enter the boiler at 25^oC . As an initial approximation assume that the effect of ash on the energy balance can be ignored.

Investigate the effect of Ash on the adiabatic flame temperature by assuming a physically consistent ash composition.