[Stoves] Coal and biochar stoves

[Ronald Hongsermeier]

Hi all,  don't want to complicate things unnecessarily, but isn't it 
axiomatic that even the same species of biomass grow in a radically 
different nutrient environment (soil) will have different levels of 
possible poisonous particles in the burnoff?

regards,
Ron von Oktoberfestsafedistance



On 24.09.2015 21:05, Crispin Pemberton-Pigott wrote:
> Dear Todd
>
> You raise an interesting point and it should not be missed.
>
> Wood and coal both contain mercury, sulphur, lead, uranium and other 
> heavy metals, and the fire emissions contain fly ash‎, polycyclic 
> aromatic hydrocarbons, numerous chemical species, and particles of 
> incomplete combustion including condensed volatiles.
>
> It would not be fair to ignore the emissions from any fire. Also it is 
> unfair to require testing on coal fires and not wood fires. The 
> inherent emissions are different for different fuels. Categories of 
> fuel include:
>
> Wood
> Other biomass
> Peat lignite
> Coal
> Semi-coked fuels
> Coke
> Charcoal
> Densified biomass
> Torrefied wood
>
> The toxic contents occur in different concentrations and combinations. 
> It is reasonable to assess fuels individually. There are toxic woods 
> and toxic coals. There are toxic emissions. Toxicity is strongly 
> dependent on concentration.
>
> When you consider what and how well something needs to be burned one 
> rule should apply to all. No pet fuels.
>
> Regards
> Crispin
>
> Stovers:
>
> I'm confused.  Coal & Biomass stove disconnect?  No one is discussing 
> the dissimilarities.
>
> Is this a logical?  The discussion of coal combustion must address 
> Mercury, fly ash and other heavy metal pollution, not just run of the 
> mill biomass combustion pollution.  Water and air pollution 
> contamination are other major health concerns.  Mining and 
> transporting coal has wide documented health impacts.
>
> Don't we have to ask although coal maybe combusted cleanly with very 
> well designed stove compared to an inefficient coal stoves, advanced 
> scrubber technologies are not affordable or practical for household 
> stoves.
>
> Do any of the biomass stove testing entities have or can afford coal 
> emission testing technologies?  Currently I am not aware of any 
> biomass testing organization that has the sophistication or equipment 
> for heavy metal emission testing, or am I incorrect?
>
> Regards,
>
> Todd Albi, SilverFire,
>
> On Wed, Sep 23, 2015 at 7:41 PM, Frank Shields <franke at cruzio.com 
> <mailto:franke at cruzio.com>> wrote:
>
>     Dear Stovers,
>
>     Coal and biomass stoves:
>
>     Similarities:
>
>     1) They both have the same goal of producing a clean secondary
>     flame used to boil water.
>     2) They both have achieved this goal (Crispin and Dean - and others)
>     3) They both have the three types of energy: a) pyrolysis gases b)
>     solid-C > CO and c) CO > CO2
>     4) During optimization the three energy types are adjusted via
>     primary air to produce the best ratio.
>
>     Because they are so much the same and manipulated the same to
>     optimize conditions for the secondary I believe the coal stoves
>     should be included in our discussions. They start with different
>     ratios of the three energy types and it would be very interesting
>     (to me) to know what the ratio is just before entering the
>     secondary flame when burning clean. I wonder if they are the same
>     or if we can learn ranges and limits to the ratios we need to
>     achieve. As we get better testing techniques to study what goes on
>     in combustion chambers it would aid us to include the info from
>     coal stoves.
>
>     Real problem is Stove Labs need more money!  That to purchase
>     testing equipment for their research, added personal and they
>     should be testing more stoves.
>
>     as I see it…
>
>     Regards
>
>     Frank
>
>     franke at cruzio.com <mailto:franke at cruzio.com>
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