July 17, 2024, 06:16:54 AM
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Topic: CH4 combustion exercise  (Read 561 times)

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Offline Thoma64

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CH4 combustion exercise
« on: May 29, 2024, 04:26:12 PM »
Hello everyone,
I am posting this message because I have an exercise to do and I am completely lost. Could you help me on how to do it? :

Consider the combustion of methane with regular air. Inlet temperatures of methane and air are 300 K and 400 K, respectively. The mass flow rate of air is 0.1 kg/s, and the lambda factor is 0.9.
This is a case of a rich mixture (λ<1). In this case, the species in the products will contain CO2, H2O, CO, H2, and N2, among other species. Mass (or atoms) conservation is not enough to close the problem.

1) Considering only the five species in the products mentioned above, evaluate the Kp of the selected equilibrium reaction based on the basic thermodynamic information (enthalpies of formation, molar heats and reference entropy of the species involved).

2) Evaluate the concentration of the five species considering Tcc=1400 K

3) Evaluate the combustion temperature and the concentration of the five species (global itetaive process)

Thank you for your help. This exercise is very important to me.

Offline mjc123

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Re: CH4 combustion exercise
« Reply #1 on: May 29, 2024, 06:00:47 PM »
Please read the forum rules; you have to show an attempt of your own before receiving help.

In any case, I don't know what a lambda factor is, I don't know what the selected equilibrium reaction is, and I don't have the basic thermodynamic information to hand. Is this information that is provided in the question paper but you are withholding from us? How do you expect anyone to solve this problem?

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