Hi everyone,

I'm new here and this is my first thread. I'm a performance engineer in a coal powerplant.

For performance calculations of our boiler I wish to use the NEN-EN 12952 norm.

I understand how the formule for the stoichiometric dry air quantity is derived this is formule 8.3-58:

It's say:

mu_Aod = 11.5122yC + 34,2974yH + 4.3129yS - 4.3212yO

The result is the stoichiometric dry air quantity in kg air/kg solid fuel

yi = different composition of the solid fuel: carbon, hydrogen,...

But I don't understand how the formule 8.3-60 can be derived?

It's say:

Vgod = 8.8930yC + 20.9724yH + 3.3190yS-2.6424yO + 0.7997yN

The result is the stoichiometric flue gas volume (STP) quantity in m³flue gas/kg solid fuel

Can somebody explane how I can get to the different coëfficients? 8.8930; 20.9724;...

Thanks in advance!

Kind regards