required amount of air

[attoutta]

hello , i need help guys and its urgent !!
i want to know if an amount of 0,17 kg/s of air is suitable to burn 0,05 kg/s of bark (wood) ?
is it normal ?

 

[athomas236]

Question is very vague, need more details like ultimate analysis.

 

[TD2K]

You really need an analysis to answer your question.

I looked in my copy of CE combustion handbook. Wood (dry basis) is typically close to 50% by carbon, 7% H2 and the balance is nearly all oxygen. Bagasse was given as just under 45% for carbon, 6% for H2 and the balance for oxygen. I have no data how bark compares to these numbers. The water content is also going to be significant.

% are weight percents.

 

[rmw]

Bark is generally considered to be 50% moisture - more if the bark is stripped off of logs that have been stored 'under water'.

rmw

 

[25362]

According to Cheremisinoff's Handbook of Heat and Mass Transfer, Vol 1, Gulf, theoretical air for the combustion of "average wood" would be around 6 lb/lb wood. The op data refer to a ratio of 3.4 which apparently wouldn't be sufficient.

The book also gives the % constituents of average wood.