Lobster wrote:

http://www.freedigitalphotos.net/image/s_garden-incinerator.jpg

Not sure what the 'batch' aspect is to what you're seeking (unless it's
very much larger, which may be the disadvantage of the above)

This will tend to be smoky, it lacks the basic requirements for a clean
burn, the three Ts.

The problem is this sort of thing cannot provide enough secondary air so
many products of incomplete combustion are simply vented to atmosphere.

It can be simply modified by the strategic addition of a small centrifugal
fan to form a mini air curtain incinerator.

These things need a few minutes to heat up but thereafter as long as the
woody waste overages below 50% moisture content they remain visibly clean.

Fresh leylandii foliage will need wilting from 200% moisture content.

AJH