A large railroad has experimented with burning powdered coal in a gas turbine combustor. Fifty percent excess air was introduced to the combustor at 1380 kPa and 127°C while the powdered coal was injected at 25°C. The combustion was adiabatic and at constant pressure. Based on a coal from Colorado that has an ultimate analysis (by mass) of 79.61 percent C, 4.66 percent H₂, 4.76 percent O₂, 1.83 percent N₂, 0.52 percent S, and 8.62 percent ash (non combustibles), what is the estimated temperature of the combustion products? Neglect the effect of the sulfur in the energy balance.

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Coal Combustion CO2, H20 SO,, 02, N2 Tprod 25°C chamber 50% excess air 1380 kPa 127°C