[Gasification] mycoremediation of tarry water

[Arnt Karlsen]

On Mon, 4 Feb 2013 23:23:22 +1300, doug.williams wrote in message 
<36D416FEBC43433A9CFF313E88274ACA at dougspc>:

> Hi Tom,
> 
> Pleased that you are still able to contribute to these debates, and
> as you seek comment to your intentions to do some testing, here
> goes(:-)
> 
> Dear Doug and all:
> 
> The Toplit Updraft gasifier produces a different gas (plus 20%
> charcoal, mostly from the lignin) than the downdraft gasifier.  I
> believe it may be a cleaner gas, since cellulose (~ CH2O) vaporizes
> to produce a different gas (CO + H2 + ?) than the lignin.  
> 
> My understanding of these open core concepts of gas making, is that
> all the pyrolysis gases released at the descending flame front of the
> raw fuel, are combusted in and with a portion of the char on the
> upper gas outlet side of the flame front. Reduction would take place
> in this narrow band of high temperature to give us the CO, but I
> would expect to see the H2 start out low, and increase as the depth
> of char increases.(Needs longer dwell time).

..quick question: H2 needs how much longer dwell time than CO?

> Question. Have you done continuous gas analysis from start-up to shut
> down?
> 
> Your question mark in the equation suggests a combustible gas
> (~CH20), which would have to survive the combustion /oxidation phase,
> or does this vaporization take place as a portion of the char is
> consumed first in oxidation,then reduction? Looking at these
> gasifying stove rings burning as a blue gas, one might conclude that
> there is little if any condensable tars present. If CH20 survives to
> be measured as a gas, it's formation may be reflected in the H2
> variation if present, depending on exactly where the H2 forms. Having
> said that, I have no experience to draw from, to know if there is
> enough thermal inertia after reduction to allow "other" reactions to
> take place.
> 
> As soon as we get some warm weather, I'll try to measure the tar
> content from each, using my 2 kW generator and a 5 gal tar filter
> made from the charcoal. Comments, suggestions?
> 
> As you expect to capture tars in charcoal, then I would want to have
> good control over the gas cooling/filter temperatures, as the dew
> points of the fuel moisture content are linked to carrying lighter
> pyrolysis gas/oils through filter media. I'd want to know, especially
> the downdraft gasifier, if it had a proven ability to make gas
> without or known condensing hydrocarbons, using the fuels of the test.
> 
> You also have the engine to feed you lots of info as to gas
> condition, and I would use that as a pre-test before you add the
> charcoal filter. A quick look under the throttle butterfly could save
> you a lot of useless testing if you see the sticky stuff in there! 
> 
> I'm sure you know all these answers already Tom, but will watch for
> your postings of the results.
> 
> Regards,
> Doug Williams,
> Fluidyne----
> 
> 


-- 
..med vennlig hilsen = with Kind Regards from Arnt Karlsen
...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.