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Topic: Chemistry theory on biomass combustion  (Read 3589 times)

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Offline kaimynas

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Chemistry theory on biomass combustion
« on: May 29, 2018, 05:22:20 PM »
So hey, i'm making a computational fluid dynamics simulation where theres a biomass furnace in which there are 2 inlets, air and biomass(in my case Birch wood/hardwood chips/wheat straw pellets) and i need some theory about the chemical reactions happening in the combustion. I don't need very hard reactions, just really some basic or intermediate ones. So does anyone have a link or a paper where i can find chemical reactions happening in combustion. Thank you very much.

Offline kaimynas

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Re: Chemistry theory on biomass combustion
« Reply #1 on: May 29, 2018, 05:27:29 PM »
By the way might be something in direction of CO2, H2O, NO and how ash is formed. But not necessary

Offline Enthalpy

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Re: Chemistry theory on biomass combustion
« Reply #2 on: May 30, 2018, 06:00:18 AM »
In combustion in air, the amount of nitrogen oxides is tiny. Important for our health, but negligible for streaming, heat amount and so on.

N2 from air stays essentially untouched. The products are CO2 (no CO under adequate combustion conditions) and H20, plus ash that may stay in place or fly with the fumes.

The difficult part is that you generally ignore the detailed composition of the combustible. You don't need too many details neither: usually, only the proportions of C, H O, N are given - and P, S etc if you care about pollutants - plus a heating value. Double-check if the units are moles% or mass%.

The combustion takes O2 from air and produces CO2 and H2O BUT
  • It never suppresses all the O2 because CO would begin to appear, so the fire is tuned to avoid it;
  • The combustible brings oxygen, don't forget! For instance cellulose is a Cn(H2O)m, where only C takes oxygen to burn;
  • The combustible contains humidity, and not little. Double check whether the composition includes it.

Offline kaimynas

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Re: Chemistry theory on biomass combustion
« Reply #3 on: May 31, 2018, 09:04:49 AM »
I need chemical reactions

Offline billnotgatez

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Re: Chemistry theory on biomass combustion
« Reply #4 on: May 31, 2018, 03:21:37 PM »
You might want to read our forum rules again.
Click on the link near the top center of the forum page.
Forum Rules: Read This Before Posting.
http://www.chemicalforums.com/index.php?topic=65859.0

You might also want to do some outside reading like WIKI
https://en.wikipedia.org/wiki/Combustion
Or do a GOOGLE on
biomass combustion

Then you can post a question that on what you do not understand.

Offline Enthalpy

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Re: Chemistry theory on biomass combustion
« Reply #5 on: June 01, 2018, 08:33:48 AM »
I need chemical reactions.

Alas, that's impossible. Combustion of wood in air is not simple enough for that. You'll have to invest your time in the question.

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