[Stoves] re-kindling stoves

[Richard Stanley]

My thoughts are that this
Is probably what the local producer is already doing-and has been for years, in response to the demands of their own local markets. 
Richard Stanley


Sent from my iPhone

On Dec 28, 2010, at 8:18 AM, "Crispin Pemberton-Pigott" <crispinpigott at gmail.com> wrote:

> Dear Richard and Andrew
> 
> I know we all quote the 6 kg of air for burning biomass please keep in mind
> that to get an excess air ratio of about 100% it takes twice as much as 'it
> seems'. 
> 
> With the gasifiers, the ratio between primary and secondary might be a 1:6
> split, but the secondary needs to provide all the excess air as well so it
> is more like 1:10 than 1:6, yes?
> 
> The primary side for the gasifiers needs to remain the same (which is based
> on experience, really) but the theoretical need for air on the secondary
> side is surely less than the real need?
> 
> So when it comes to the air moving through the hollow briquette, can we
> treat the whole needed air supply as being present 100% (instead of a
> separate secondary supply) and concentrate only on mixing and combustion
> chamber temperature? It looks as if the hole is a means to sneak the whole
> air supply past the light biomass fuel without increasing the burn rate
> which is what happens in most ordinary fires. I think Paul made this point
> clear when we were talking about getting secondary air through the coal bed
> earlier in '10.
> 
> So, one big advantage of using hollow briquettes is that it is probably
> possible to get the whole air supply through in one go and avoid having the
> complexity of secondary admission.
> 
> This being the case, it should be possible to create a perfect hole size for
> each briquette mix and compression/forming method. This means in practice
> that for any consistent product, one should vary the hole diameter and test
> them in a stove, measuring the excess air. A simple method to do that is to
> look for visible smoke most of the time. That means the air supply is
> inadequate.
> 
> On the briquette press side, it means having replaceable cores with many
> diameters. Fully implemented, one could select briquettes with the
> appropriate burn rate: denser probably needing smaller cores to have the
> right air supply to burn slower and longer.
> 
> Got thoughts on this?
> 
> Regards
> Crispin NOT in the snowstorm
> 
> 
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