Re: GAS-L: Batch loaded gasifiers - small ones

[Arnt Karlsen <arnt@c2i.net>]

On Fri, 28 Jun 2002 18:13:46 -0500, 
"Paul S. Anderson" <psanders@ilstu.edu> wrote in message 
<4.3.1.2.20020628175344.01b37210@mail.ilstu.edu>:
> 
> 2.  The above named small gasifiers drive off the gases and create 
> "char".  Tom's stoves (combustion units) will then in a second phase
> burn (consume) the char, leaving only ash.  But Ron Larson and I like
> to remove the batch of char, and then reload with fresh biomass fuel
> for more gasification.   Reasons:  Ron wants to save char.  

..like, as charcoal, for say cooking fuel or catalyzers? 

> I want to protect my fragile stove from the "forge-like" heat of the
> burning of the char.  

..use the ash for heat insulation.  Old WWII trick, known as 
the "V-hearth" in 'Gengas', chk 'cone ash' in my figure in url: 
http://www.crest.org/discussion/gasification/199903/msg00055.html

> Question:  What do the commercial gasifiers do about char production? 

..anyone?

> Do you consume it right on the spot, with either simultaneous
> consumption of char while gasifying other fuel OR as a second phase of
> the burning process?  Or does anyone remove the char from the
> gasifier, and if so, for what purposes?

..if you do thermochemical gasification of biomass, your _primary_ 
fuel are tar vapors.  I burn a lot of them in my tar flare, adding 
to the stability of the processes.  My secondary fuel, charcoal,
doubles as the primary catalyzer, and is consumed.  I have not 
tested how much charcoal can augered out without excessive loss of
process stability, my sewer pellets experience suggests "a lot".

-- 
..med vennlig hilsen = with Kind Regards from Arnt... ;-)
...with a number of polar bear hunters in his ancestry...
  Scenarios always come in sets of three: 
  best case, worst case, and just in case.


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