[Stoves] pellet gasifier

[Paul Olivier]

Yes, there are several differences relating to the fan, the reactor
housing, burning housing and so forth.
Just look closely at the picture I have posted.
https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Pic/IMG_1490.JPG

I make sure that the fan can be easily detached before biochar is emptied.
Otherwise it is easily damaged by the rising hot air.

I do not use a reactor housing. I am a firm believer in stainless steel,
and to make a reactor housing in stainless steel is too expensive.
Stainless steel gives the unit a certain aesthetic appeal which I believe
is quite important in assuring the consumer that this is not a poor man's
stove. In my experience, a reactor housing still remains quite hot. The
housing does not allow one to see if there are hot zones within the reactor
(channeling). Instead I recommend an enclosure that limits access to the
reactor and provides stability.

I put a special housing around the Belonio burner that forces secondary air
to mix with the syngas. Without this housing one gets the diffusion tail
that can be seen in the picture you just sent me. With a burner housing,
the diffusion tail disappears:
http://www.youtube.com/watch?v=vnM5Itk7wlQ
https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/MVI_1574.MOV

But the critical part here is the Belonio burner, which I did not modify in
any way. This burner allows one to immediately spot the presence of CO2 in
the syngas. The moment any of the 80 burner holes do not support a flame,
then CO2 is being formed. With CO2 present, there is a good chance that the
combustion of CO is not complete.

My effort in stoves is totally non-profit. If anyone would like to set a
workshop assembling this stove in a particular country, I would be
delighted.
I can supply at cost all of the punch-cut parts. There are only three parts
that are vertical and cannot be punch-cut: the reactor and two parts within
the burner assembly. These three parts should be made locally using
conventional rolling equipment, which most workshops possess. Since they
occupy very little space, punch-cut parts are cheap to transport. In this
way the local workshop does not have to invest in expensive molds. I am now
in a position to make thousands of sets of punch-cut parts per month.

Thanks.
Paul


On Sun, Jul 7, 2013 at 9:12 PM, M. Nurhuda <mnurhuda at ub.ac.id> wrote:

> Dear Paul,
>
> I have seen the video you put in your dropbox. Nice stove.
>
> Is there any difference in the design principle of your stove from that of
> Prof. A. Belonio? Please check the picture of Belonio's pellet stove.
>
> Regards
> M. Nurhuda
>
> > Some of you might be relieved to know that I do not focus only on policy
> > issues.
> >
> > This is what this little pellet gasifier looks like:
> >
> https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/IMG_1571.JPG
> >
> > Today I ran this unit on pellets of diameter of 8 mm. Here I employed a
> > fan
> > of only half the air resistance as in the previous run. I filled the
> > bottom
> > half of the reactor with pellets, and the top half with loose rice hulls.
> > The loose hulls make the pellets much easier to light, and they do a good
> > job of filtering and cracking the gas. Without the rice hull biochar on
> > top, I simply cannot get a predominantly blue flame from 8 mm pellets. I
> > would have much preferred to have rice hull pellets of a 6 mm diameter.
> > And
> > once again the power of the fan could have been easily reduced by another
> > 50% to only 0.2 InAq.
> >
> > In any case, this is what the unit looked like in operation:
> >
> https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/MVI_1574.MOV
> >
> > Note that the flame is not entirely blue. What amazes me is the amount of
> > heat this unit puts out. The biochar pellets that this unit produces are
> > firm, hard and quite beautiful:
> >
> https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/Photos/IMG_1563.JPG
> > When the unit is emptied of biochar, and the biochar pellets are dropped
> > into water, a huge crackling sound is made. Loose rice hull biochar does
> > not react in such a forceful manner when it is quenched.
> >
> > It will take a while before this unit could be brought to market. A lot
> > more work is needed. I think that a pellet gasifier would be ideal in
> > urban
> > areas. Transporting and storing large bags of loose rice hulls in an
> urban
> > setting is messy and impractical. Hopefully such a small gasifier (the
> > reactor weighs but 1.2 kgs) would appeal to the more affluent in Vietnam.
> >
> > I hope you all are not fed up with such technical detail.
> >
> > Thanks.
> > Paul
> >
> > -- Paul A. Olivier PhD
> > 26/5 Phu Dong Thien Vuong
> > Dalat
> > Vietnam
> >
> > Louisiana telephone: 1-337-447-4124 (rings Vietnam)
> > Mobile: 090-694-1573 (in Vietnam)
> > Skype address: Xpolivier
> > http://www.esrla.com/
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-- 
Paul A. Olivier PhD
26/5 Phu Dong Thien Vuong
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
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