[Gasification] hearth load and throath diameter

[Mariodg77]

Dear forum,

proceeding in my thesis, i've analyzed a study made here at the university.
but there is a point that i think it's wrong, and i ask you advice.

dimensioning a down-draft gasifier a guy considers firstly  the hearth load
B in this way:

B = 2,5 * 0,03  = (4*Qgas)/ (3,14*D^2)    (0,03 is the data also taken from
FAO's book for a gasifier without any throath)

saying that this is the maximum value that doesn't cause a big pressure
drop, and for this reason, he says that now he can find the diameter of the
throath Dt, and he uses the formula:

Dt= square root(4*Qgas/3,14*B)       (using the value of B for a reactor
without troath!)                             

where Qgas is the gas intake in the engine

I ask if this method is correct, I don't think so and i'm quite sure, but
before criticize it, i would like to be sure....
I would have used B for a reactor with troath, do you?

thanks,

mario



 
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