William Bronson wrote:What Douglas said.
However you do it, and even if you don't capture the heat for use, always burn those off gasses.
From what I have seen a TLUD stove is the simplest way to make char and make use of the heat produced.
I have struggled to use them without highly processed fuelstock , but others seem to have little or no problem.
TLUD's have been used to heat homes, power stove tops and fire ovens.
These functions are not always needed.
When that's the case, drying fuelstock , baking clay bricks or distilling water are functions that produce a storable yield.