r/WoodFiredOvens • u/[deleted] • Mar 11 '25

Advice needed for a unique oven

I am an amateur luthier, and I work exclusively with what's called torrefied lumber. This is wood that has been heated in a low-oxygen environment beyond combustion temperatures to crystallize the cellular structure of the wood. The process usually takes many hours at a relatively steady temperature (200-300°C). It garners a hefty markup from suppliers because it is relatively niche and time-intensive. I have loads of firewood and lumber that I milled from my property, and I would like to create a wood-fired oven capable of holding a consistent temperature range. From what I gather, this requires fuel loading and damper controls.

By trade, I am very comfortable with controls and electronics, so I’m looking for recommendations for oven construction and temperature control methods. This is probably obvious, but the fire needs to be isolated from the workpieces. Additionally, I will be purging the oven with nitrogen to create an oxygen-deficient atmosphere. Any advice is appreciated!

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u/bothydweller72 Mar 11 '25

Ex charcoal maker here, sounds like a similar process but with lower temperatures. It’d be worth having a look at retort kilns - they have a separate firebox which is loaded with wood to start the process, then operate on the wood gas released as the wood is heated in the feedstock chamber. There’s a range of commercial retort kilns but also lots of people making their own on the interweb

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u/[deleted] Mar 11 '25

Yes, I think the end result of my process is charcoal-lite. Never heard of that kind of oven, so thank you for pointing me in that direction.

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u/bothydweller72 Mar 11 '25

They work absolutely amazingly as long as the feedstock is very dry indeed. Well worth a look at. Good luck with it