[Gasification] gasifier type updarft use rice husk

[Thomas Reed]

Dear gassers and Stovers

Using any size TLUD device including an open PYROMID, and any junk biomass, we all have easy access to as much charcoal as we could ever need, for the first time in history.

Furthermore, Hugh McLaughlin tells me that, while it's not true activated charcoal, made with steam or CO2 at 800C, it has significant absorption capacity (iodine no 400?) since it is made at 500-800 C.  I hope Hugh or Frank will comment.  

So we really have no excuse for cleaning up TLUD gas if we wish to.  

I'm waiting for a good analysis of TLUD gas.  I suspect after cleaning it will have significantly more energy than the typical 5.5 MJ/m3 or 150 Btu/ scf of downdraft Woodgas, since the air fuel ratio for pyrolysis is only 1-1.5, rather than the 3.5 for complete gasification of the cellulose lignin package that is wood.   So, as a first guess, with 1/3 the A/F ratio, I'm guessing 3x the energy content, of 4.5 MJ/m3 or 450 Btu/scf.  Compare to natural gas at 1000 Btu/ scf. 

I'd sure like to see some comments from all you practical guys (and dolls?) out there.  

Onward 

Tom Reed.   Dr WoodGas




Dr Thomas B Reed 
The Biomass Energy Foundation
www.Woodgas.com

On Dec 17, 2011, at 9:16 AM, quoc cuong Pham <pqcuong84 at gmail.com> wrote:

> Hi jeff!
> Thanks you with idea that. i am wroking with type downdaft capacity 150kg/h,there is a prolem with suction fan  tar , suction fan does not wrok  a long time . and  treament tar consider after that effect not good . you can help me.
> thanks!
> 
> 
> 2011/12/7 Jeff Davis <jeff0124 at velocity.net>
> Hi Cuong,
> 
> Standard updrafts do not have a tar cracker.
> 
> One idea that I never tried with an updraft was to take the working gas
> off above the charcoal area. Next with some kind of fan suck the tarry
> gas off the top and route it back up into the bottom (air inlet) of the
> gas producer. Good way to tar up a fan and I doubt that it would be easy
> to balance but maybe as a last resort.
> 
> Anyhow downdrafts natural crack tar to some point.
> 
> 
> Good luck,
> 
> 
> Jeff
> 
> On Tue, 2011-12-06 at 22:18 -0800, quoc cuong Pham wrote:
> > hi all!
> > I design updarft rice husk capacity 100kg/h.there is a problem tar
> > high,process level of Moist.
> > Fuel use burn direct and no craking tar.
> > discontinuous and working gas is laborious, low-built efficency.there
> > is betterment which way neither.
> > thanks!
> > cuong.pq
> 
> 
> 
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