[Stoves] Limiting factor for secondary burn?

[Paul S. Anderson]

Dear Frank,
Quoting frank <frank at compostlab.com>:

> 1) what should the small fuel look like after the primary burn (I have
> not set up for the secondary burn yet)?  Should the sticks look like
> sticks - only black?
> 2) should the glow move up the pri. fuel body (BLUD) because the
> structure of the fuel is maintained (only black) or should the fuel drop
> down due to additional breakdown?
> 3) Is the goal to have the tar go into the sec. burn? or is it better to
> trap it in the fuel body and keep it away (only letting the lighter vol.
> organics go into the sec. burn)?
> 4) It you get tar in the pri. burn is that indication of a burn that is
> too hot?

What you have ask indicates to me that you are not doing a TLUD nor a woodgas
unit nor a gasifier.  What is the basis for the design that you are 
using? Perhaps I do not understand the nature of your experiment.  
Please explain.

Paul

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