[Stoves] Pellet stoves - risks

[Frank Shields]

So i wonder Frans if that is due to the size of the fuel being too large or the added resins from the type of biomass?

Thanks

Frank
Frank Shields
franke at cruzio.com




> On Sep 6, 2015, at 5:05 PM, Frans Peeters <peetersfrans at telenet.be> wrote:
> 
> Dear Frank and all,
> 
>    I got the PUF  with pine biomas
> But it ONLY happens if the fuel adding is too large !
> REAL TLUD is badge and no adding on top but theoretical UNDER the FIRE .
> So use 5 more  NEW  TLUDS and refill the cold again .
> An automatic pellets stove drops ONLY 5 pelets a second! And never pufs .
> No 5Kg at once  !. so you get PUFS like a BULL STEAMING along its ears .
> 
> Frans
> 
> 
> Dear Andrew
> 
> Can we realistically run a pelleter at 280 C input and save energy? The
> output is already charring the material. Perhaps that is torrefaction on the
> fly, so to speak. If so, the MJ/kg should rise with processing. 
> 
> The pellets are have in Java are 8% moisture (Albasia). IF it gets really
> hot and was bagged, it should be zero.
> 
> Crispin
> 
> 
> Frank on the large scale I doubt it is a problem because as you heat wood up
> through 100C and drying and then on to the evolution of some VOCs to this
> 280 C torrefaction range you are always in an endothermic reaction, let it
> slide above 330C and it becomes mildly exothermic, so with a bit of feed
> back it should be possible to stay around280C with no thermal runaway. By
> thistemperature presumably lignin is quite plastic so pelleting power should
> be lower.I'm not sure what chemical changes are taking place but I'm
> assuming some hydroxyl groups  are being lost, making the material less able
> to attract water i.e changing from hydrophilic to hydrophobic, so unlike
> sawdust pellets torrefied pellets should store better without attracting
> moisture and disintegrating. What are they like when dropped in a glass of
> water for an hour or two?
> 
> With large scale it will also be easy to incinerate the low cv offgas given
> off bythe process.
> 
> AJH
> 
> 
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