Ways to burn off flue gases?

[beau]

Hi all

I am new here and hunting for ideas for a project I am working on. It's a charcoal retort and its working well but has a snag in that it is not as clean burning as hoped. I have a barrel on it's side which outgases over a fire. This is contained in a kiln type chamber with a flue. The first burns I did with uncontrolled air worked well but overcooked the steel of the kiln. MK2 has the steel insulated and a controlled air supply but this is resulting in smoke from the flue. I am wondering if there is a way to have a secondary burn on the flue but outside of the kiln to clean the escaping gases. The exiting gases are between 500-600C 

Many thanks
Beau

[beau]

Hi again

A bit more info that might help. This is a short clip of my MK1 mid burn. The air was uncontrolled and you can see the jets of flame coming from the holes in the barrel. www.youtube.com/watch?v=LqzffyFhhmo This made good charcoal but overcooked the steel frame and the barrel. For MK2 I fully inclosed the barrel and have control over the air supply. Again it made good charcoal and steelwork survived unharmed but due to the lower temperatures it was smoky for much of the burn which is something I would like to eliminate. One idea is to try to ignite the flue gases outside the retort if possible. The far more complicated idea is to have the gases that are exiting the barrel enter a rocket stove like the Hookway retort does. Where it would differ from the Hookway is the gases could be directed back into the retort or redirected to bypass it when temperatures climb too high. A link to the Hookway retort for those who are not familiar with it www.youtube.com/watch?v=A6AfHjUIYv0 Hope that makes sense. Done a quick sketchup drawing but cant see a way to attach it.


Thanks

[pigbuttons]

I would think that unless you put a fan on the thing, once flue gases are ignited they will burn back into the charcoal area. Gasifiers usually have a fan that prevents back burn via high velocity.