Question

# Methane gas at 400K and 1 atm enters a combustion chambar where it is mixed with...

Methane gas at 400K and 1 atm enters a combustion chambar where it is mixed with air entering at 500K, 1 atm. The products of combustion exit at 1800K and 1 atm with product analysis given in

For operation at steady state, determine the rate of the heat transfer from the combustion chamber in kJ/kmol of fuel. Neglect kinetic and potential energy effect . The average value for the specific heat of methane between 298 and 400K is 38kJ/molK. The balanced chemical equation is as follows:

CH4 + 2.265O2 + 8.515N2 ---> 0.951CO2 + 0.049CO + 0.289 O2 + 8.515N2 + 2H2O

The Cp data for the components is as follows

 Cp/R = A +BT +CT2 + DT-2    Where T is in K from 298 oK
 Name Chemical formula Tmax CpigP298/R A B*103 Methane CH4 1500 4.217 1.702 9.081 Carbon monoxide CO 3000 3.507 3.376 0.557 Carbon dioxide CO2 2500 4.467 5.457 1.045 Nitrogen N2 2000 3.502 3.28 0.593 Oxygen O2 2000 3.535 3.639 0.506 Water H2O 2000 4.038 3.47 1.45

Enthalpy for all the components involved in above reaction is evaluted by the following General equation