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

[Tom Miles]

Alex,

Great reference that illustrates the movement well. Thanks. 

Tom



-----Original Message-----
From: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Alex English
Sent: Sunday, October 16, 2011 5:58 AM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] why does coffee husk biochar smell like urine?

Paul,
  Attached is minimalist, two points, graph showing potassium volatility
beginning at 400C with a ~37% loss at 800C.
Courtesy of Preto and Hrbek;
http://www.biochar.ca/files/Can%20Biochar%20Initiative%20Preto%20Dec08.pdf

Alex


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
>