If you don’t live with a wood burning stove then this will be totally useless to you.
If you do – you will understand completely how to use the dampers.
In the image above my wood burner has the dampers half open (the brass KNOBS at the bottom) because I’m burning really hard wood.
When you start your burner – yes – you need the dampers fully open to feed air into the flame so that you get a fire. D’uh.
But once the wood is burning nicely, shut the dampers fully. Cut off the air flow. And you will get a long, slow burn.
There’s a lesson in there somewhere ?