[Gasification] Gasification Air/Fuel Ratio

[Brennan R Henderson]

Dear Listers,

After a long break I am continuing construction on my conventional  
updraft gasifier. I am getting close to trying it out but I have some  
questions about
the air/fuel ratio.

On page 24 of the book "Handbook of Biomass Downdraft Gasifier Engine  
Systems" on table 4-2 it states:"Air Ratio Required for Gasification: 
2.38kg wood/kg air (lb/lb)" (Moisture and Ash Free Basis)

Then on this link: www.woodgas.com/EquivalenceRatioDiagram.pdf, it  
states that an air/fuel ratio for conventional gasification should be  
1.5/1 (Moisture and Ash Free Basis). With an equivalence ratio of . 
25. In this instance, are they speaking in terms of mass?

I must be missing something here, If someone could point me in the  
right direction that would be very helpful.

Also on page 32 of the book "Handbook of Biomass Downdraft Gasifier  
Engine Systems" it states " The updraft gasifier throughput is  
limited to about 10GJ/h-sq.m. (1MBTU/h-sq.ft.). When speaking about  
hearth load,
are the authors refering to the energy of the wood that passes  
through the
hearth in an hour or the gas that is produced in an hour?

Once again any information would be very helpful.

Thanks in advance,

Brennan Henderson