[Stoves] why does coffee husk biochar smell like urine?

Alex English english at kingston.net
Sun Oct 16 05:58:10 PDT 2011

  Attached is minimalist, two points, graph showing potassium volatility 
beginning at 400C with a ~37% loss at 800C.
Courtesy of Preto and Hrbek;


On 16/10/2011 2:25 AM, Paul Olivier wrote:
> Tom,
> But the temperature in the reactor is much higher than 350 C.
> I have seen a sort of clinker in the biochar if I do not turn the fan 
> off at the end of a batch.
> At what temperature does the vaporization of K take place?
> Paul

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