[Terrapreta] BOF CHARCOAL MAKING THEOREM

[Kevin Chisholm]

Dear Ben

That is a neat looking metal melting furnace you made!!

I have a few questions:
1: Why do you use two blowers? Is it simply to get a variable heating rate?
2: Do you have "back-flow flaps", the equivalent to a check valve, to 
prevent one fan from exhausting out the other when the second fan is not 
operating?
3: With extended operation, does heat tend to travel back from the 
furnace, and melt the plastic "Y" fitting? Would a pipe extension be 
advisable?
4: What temperatures have you attained with this furnace? What metals 
have you melted?
5: What material have you used for lining the steel can?

Best wishes,

Kevin



Benjamin Domingo Bof wrote:
> 1- Temperatures up to 450 C not more.
> 2- Pressurized burned gasses to reaction dynamic.
> 3- Collect all effluents, they are money. Many times yielding more 
> than charcoal production.
> 4- Save waste heat for other agriprocesses, distilling, drying.
>
> http://tech.ph.groups.yahoo.com/group/WoodGas/photos/view/14ef?b=1
>
> This address is of furnace but is an layout of possible kiln with 
> forced draught.
> Regards, Ben.
>
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