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Coal deomposition and conservation of energy

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Old   May 27, 2011, 12:51
Default Coal deomposition and conservation of energy
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Frank Vejahati
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I am having problem understanding how the coal calculator built in feature in fluent works, here is the problem:
we know that calculator it determines the volatile composition based on the ultimate analysis and volatile yield. However, they do not mention anything about how the energy conservation of fuel is met
we know that cal can be represented as:
Coal ---> Char +Volatiles + moisture (1)
Volatile+ heat --> CO, CO2, H2O,....
We have the coal HHV in LHS of eq (1), we know the heat of formation for H2O (l) what we do not know is enthalpy of volatile and char. The total energy content of coal should be equal to the sum of standard enthalpy of volatile+water+char.
Does anyone know how fluent determine the volatile matter enthalpy?
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dpm, fuel decomposition, fuel energy

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