Biochar producing indoor woodstove?

I'd like to make biochar, I'd also like to use the heat to warm my home.

I've heard that a retort might be the way to go? (I understand this to mean a metal container bolted to the side of my woodburner with some smallish air holes between the burner and 'retort' container?)

I'm mindful of CO poisoning and wanting to keep combustion gasses out of my lungs. Are there some designs I should look for? Or am I going to have to design my own?

I don't know if this is along the lines of what you are looking for but maybe it'll help in some way.

How about a steel ammo box?
Pull the rubber gasket and replace it with stove gasket.
Drill holes for the wood gasses to escape.

Thanks for the replies.

I guess if I already had a burner with a large burn chamber a tin would probably do fine.

I'm interested in using some rocket principles and getting the combustion as efficient as possible (for the heat generation) so I guess I'm wondering if anyone has done an indoor rocket stove that produces charcoal?

It may be a case of getting the welder out and some scrap and trying a few things.

How about this?

https://www.google.com/search?q=Biochar+producing+wood+stove&rlz=1C1UEAD_enUS1037US1038&oq=Biochar+producing+wood+stove&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIGCAEQRRg8MgYIAhBFGDwyBggDEEUYPNIBCDY3MDlqMGo3qAIAsAIA&sourceid=chrome&ie=UTF-8#fpstate=ive&vld=cid:7b9ac516,vid:jxBUqk2M3Y8

Hi Bradford. Welcome to Permies!

Your google search link doesn't load anything at all on my system.

Have you tried producing biochar in a wood stove? Is there a specific link that you find informative?

I don't know why it would not work. It was a link to a video on putting a stainless steel rectangular commercial serving container with top directly into the wood stove to produce charcoal. It seemed to work elegantly. Such a simple solution.  

Since the link does not work it is called "Biochar - Making it in the wood stove AND heating our home" by EdibleAcres. Googling that should get it.  

Hi Bradford. I use this method on a nearly daily basis this time of year. I can fit three of the 65 mm depth 1/4 size stainless steel pans into our wood fire. I put them in when most of the action has subsided but there's a good bed of hot coals and at least some flame still happening (often as I'm getting ready to go to bed in the evening).

The way the lid fits securely without trapping the gases inside is a real plus. I can make "pretty biochar" by using nut shells or planer shavings, and this is also the setup I use to do simple testing of biochar by repyrolysis, which helps with quality control. The pans tend to last about two heating seasons before the bottoms fall out. I'm probably getting well over 150-200 burn cycles out of them before they're destroyed. It's a great way to make biochar and harness the heat of the process.