Combustion products

[mfqd13]

Hi,

I usually make some combustion calculations for boilers using different fuels: natural gas, fuel oil, biomass, etc.
In every chamical analysis that i make, anf from what i have learned, combustion products are allways the same: CO2, H20, N2 and O2.
But, i have a question: what about other chemical components that are usually measured in the flue gases like CO, NOx, ashes, and others??? Everytime someone asks me this ("And what about NOx? What about CO?") i don't know what to answer...

Can anyone clear for me this??
Thanks

 

[TD2K]

Technically, components like NOx and CO should be included in your combustion calculations but their concentrations are typically very low (ppm) thus the error in ignoring them is insignificant when the percentages of H20, CO2 and even 02 are far higher.

Now, if you were doing calculations for producing water gas, you would want to include CO in your calculations.

 

[mfqd13]

Ok!
I didn't understand what do you mean with "...producing water gas..". Can you clarify for me this?
Can you give me an example of a combustion chemical equation for that example please?

Thanks

 

[25362]

From the free dictionary

water gas
n.
A fuel gas containing about 50 percent carbon monoxide, 40 percent hydrogen, and small amounts of methane, carbon dioxide, and nitrogen, made by passing steam and air over heated coke or coal.