[Stoves] Fan-blaster Combustors, Stove Camp 2006, and theDell-Point Pellet Stove

[Thomas Reed]

Dear Tom, Dean, Paul and Aul:

I can understand that our 3 kW WoodGas Camp stove was too small to 
participate in these tests. 

This is because it was made to be portable for camping.

It is important to realize that the principles can be applied at any 
scale and we have made other sizes in the lab.  I would encourage all to 
work back to the principles

    * It is impossible to mix wood in the correct proportion with air
      (A/F ~6) to get clean combustion
    * Wood combustion is therefore stages - a devolatalization stage
      (with smoky flames) and a charcoal flame (with high CO emittions
    *  Natural draft does not provide sufficient mixing and turbulence
      for clean combustion and good heat transfer
    * If wood it first gasified, the gas can be mixed and burned with
      high heat transfer and low emissions. 

All of this was discovered for coal in the 18th century, but has not 
been applied to small scale cooking. 

We chose the campstove format because campers have money.  We hope 
others will make other appropriate sizes for the ~3 Billion people who 
desperately need high efficiency and low emissions.

Yours truly,

TOM REED                BEF

Tom Miles wrote:
> Maybe this is a question for Dean: what is the minimum power requirement for
> a stove to be tested with the 5 Liter WBT?
>
> If the Phillips, Reed, Woodflame stoves are all too small and have to be
> operated in a special way what kind of fuel inventory and kW power rating is
> the minimum for this test? Or do we know?
>
> Tom
>
>
>
>
>
> -----Original Message-----
> From: psanders at ilstu.edu [mailto:psanders at ilstu.edu] 
> And it was Dean who clearly stated to me that the Woodgas Campstove has been
> repeatedly operated in this same way (what I am calling "fan-blaster") in
> previous emissions testing because the duration of the burning by a 
> single load
> of fuel in the small fuel chamber of the Woodgas Campstove was not
> sufficient
> for completion of the WBT Water Boiling Test.  I am sure that is true
> because
> the Campstove's capacity for the "official wood" used in all emissions
> testing
> at Aprovecho is significantly less that what is needed to accomplish even
> the
> boiling of 5 liters of water, and then still to have the pot simmer for 45
> minutes.  I understand and accept that way of operation during those tests
> because the Woodgas Campstove is not able to be reloaded for further T-LUD
> operation without removing the pot, emptying out the char/ash, partially
> cooling the inside of the stove to prevent ignition at the bottom, and then
> reloading and relighting for T-LUD operation, and replacement of the pot
> onto
> the stove.  Such a procedure is not convenient, so the procedural solution
> was
> use what I am now calling "fan-blaster" combustion.  What is interesting is
> that the "fan-blaster" mode of operation was not recognized or noted or
> reported, and we thought it was a T-LUD operation.
>
>
>
>
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