[Stoves] Char used for cooking

[Nikhil Desai]

Andrew:

What "heavy metals" in what kind of biomasses?

This is a new one for me.

Nikhil

On Thu, Sep 21, 2017 at 4:09 AM, Andrew Heggie <aj.heggie at gmail.com> wrote:

> On 21 September 2017 at 06:30, Frank Shields <franke at cruzio.com> wrote:
> > Stovers,
> >
> > When i do a butane activity test I pass butane gas through the char and a
> > good char will take up ~ 20g butane for every 100 g dry char. Most is
> around
> > 8 g added to 100 g dry.
>
> This is adsorption?  Presumably the more internal surface area the
> more butane is retained. Most chars are only mildly activated and the
> effect is increased many fold by treating the char with an oxidant
> that will "pit" the structure.
>
> >On a volume basis there should be an increase in
> > energy. Filling stoves is done on a volume basis. Not sure about
> increase of
> > energy on a weight basis.
>
> As butane has three times the calorific value of wood it should be
> more but what's the point, for cooking, in devolatising wood to make
> char just to add a gas back?
>
>
> >Butane is what I use but the char will take up
> > other organic gases.
>
> ... and heavy metals apparently
>
> Andrew
>
>
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