here is the rich gasifier of 1900 which is perfect for the use you want,
there is a fireplace for burning non-noble fuel, tree bark, a proportion of plastic, tires, ect …
I have developed a focus that does not produce clor and dioxin and for nox, we use the injection of urea, which is not on the croque, which makes this device to EU standards .
So the hearth warms up the vertical tubes, which in their interior have wood, with moisture to make hydrogen, and stays at the bottom of a tube of charcoal, the gases go through a sprinkling to remove simply carbon-free dust, then go to an engine where a burner, being airtight, so no nitrogen, the gas at 3000 calories is produced.
4 vertical watertight stores, allows to make loads of wood and evacuation of remnants of charcoal alternately without stopping the system,
the device owes its performance thanks to the refractory bricks, very important, one of the reasons that the Abner furnace works well, the radiation of the brick to rise in high temperature,
I see that you work with stainless steel, so it’s not a problem for you to make this oven, at the time, it was only poor quality cast iron that did not last long.
The further you look in the past, the farther you look in the future.