Prompt NOX - Methane combustion

IRP · August 9, 2018, 22:58

Dear all

I am using two-step Methane combustion reaction by Fluent, and my purpose is to calculate the Prompt NOX, to do that I need to calculate the Equivalence Ratio and the Fuel Carbon Number which is the number of carbon atoms per molecule of fuel.

-Two-step Methane Reactions:
1st reaction: CH4+1.5 O2 → CO + 2 H2O
2nd reaction: CO + 0.5 O2 → CO2

My question is that: To set the fuel carbon number, should I consider the 2nd reaction(number of carbon in CO) also or not?

Finally, Which one is right?
Fuel carbon number = 2 (including 1 carbon CH4 from 1st reaction and 1 carbon CO from 2nd reaction)
Fuel carbon number = 1 (including only 1 carbon in 1st reaction CH4)

Thank you in advance.

LuckyTran · August 10, 2018, 00:52

Fuel carbon number is based on atomic number of your fuel. Your fuel is CH4 not CO.

IRP · August 11, 2018, 02:38

Thank you for your reply LuckyTran

August 9, 2018, 22:58	Prompt NOX - Methane combustion	#1
IRP Member iman Join Date: Jun 2015 Posts: 35 Rep Power: 10	Dear all I am using two-step Methane combustion reaction by Fluent, and my purpose is to calculate the Prompt NOX, to do that I need to calculate the Equivalence Ratio and the Fuel Carbon Number which is the number of carbon atoms per molecule of fuel. -Two-step Methane Reactions: 1st reaction: CH4+1.5 O2 → CO + 2 H2O 2nd reaction: CO + 0.5 O2 → CO2 My question is that: To set the fuel carbon number, should I consider the 2nd reaction(number of carbon in CO) also or not? Finally, Which one is right? Fuel carbon number = 2 (including 1 carbon CH4 from 1st reaction and 1 carbon CO from 2nd reaction) Fuel carbon number = 1 (including only 1 carbon in 1st reaction CH4) Thank you in advance. Last edited by IRP; August 9, 2018 at 23:59.

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August 10, 2018, 00:52		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,675 Rep Power: 66	Fuel carbon number is based on atomic number of your fuel. Your fuel is CH4 not CO.

August 11, 2018, 02:38		#3
IRP Member iman Join Date: Jun 2015 Posts: 35 Rep Power: 10	Thank you for your reply LuckyTran