[Stoves] Continuous gasifier for household scale - experience sharing

[Tuong DoDuc]

Thanks Paul Oliver,

I went through your presentation several times before.
I must say that It is very convincing and inspiring as well.

Regarding the continous feed concept, I think it is a trade-off.
One one side, we will tell the users all the pros anc cons and let them
decide to choose what they like.
In this case, we will leave several different options for the users by a
field test of different gasifier models.
The user will tell. At this development stage of the continuous gasifier, I
can't tell which (batch or continuous) suits the user most. Especially,
there is no one-size-fits-all solution

Best regards,

Tuong


On Tue, May 14, 2013 at 10:12 AM, Paul Olivier <paul.olivier at esrla.com>wrote:

> The moment one goes from batch to continuous, the process gets really
> complicated. Nothing beats the simplicity of a static batch reactor.
> It provides ideal gasification conditions. The problem regarding the
> length of the batch cycle can be overcome if the fuel is densified. If
> the reactor is filled with pellets, the length of the cycle can be
> extended to well over five hours. Imagine: for a five full hours, the
> operator does not have to intervene. There is no loading of rice hulls
> or scrapping out of biochar during this entire period.
>
> https://dl.dropboxusercontent.com/u/22013094/Paper/Presentations/Gasification.ppsx
> The time to empty, reload and relight a batch reactor is less than one
> minute.
> Several reactor tubes can be operated at the same time.
>
> Thanks.
> Paul Olivier
>
>
> On Tue, May 14, 2013 at 8:23 AM, Tuong DoDuc
> <tuong.do at devi-renewable.com> wrote:
> > Dear Dr.TLUD, Paul Oliver, and others,
> >
> > The team in SNV Vietnam is adopting the continous gasifier model
> developed
> > by Belonio. The manual has been obtained from the CRHET.
> > Watch our first propotype: http://www.youtube.com/watch?v=xQGS-VQIj5M
> > We were able to control the fire, load fuel without affecting the fire,
> and
> > easily remove char at the bottom of the reactor.
> >
> > We also adopted the computer fan-casing by a cheaper, more popular fan in
> > Vietnam (often used for coal and fixed wood stove). Fan costed 2USD
> (while
> > to replicate Belonio's fan-casing, we bought the adapter for 5USD and a
> > computer fan for 1.5USD)
> >
> > However, this is just our first step and we still have so many problems
> to
> > fully control the fire and ease the operation.
> > 1) For instance, uncontrolled moment happened when combustion occurs
> rigt on
> > top of the fuel hopper, a lot of smoke was produced and later the fire
> burnt
> > the fan.
> > https://www.dropbox.com/s/43fkjs0axuye4oj/uncontrollable_moment.jpg
> > https://www.dropbox.com/s/rd1g1cg0a9ue8qt/fan_casing.jpg
> >
> > 2) Another problem is that a lot of tar is produced. It deposits on pot
> > bottom, burner and other part of the stove. That would also harm the
> user.
> > An idea is to create a layer of char in the burner pipe (to filter the
> tar).
> > Not tried yet.
> >
> > 3) We observes 5-10% of the gas leaked out through the char removal
> door. We
> > burnt them, but user may not know (or they simply just don't care) that
> it
> > is toxic.
> >
> > 4)  One more, it is very hard to control the final minutes of the
> > gasificatoin process. It always cause inverted combustion to the fuel
> > hopper.
> >
> > By this email, I would like to ask if some of you have done similar work
> > with continuous gasifier like this to share more experience. We can thus
> > reduce our time and effort in localizing this technology.
> >
> > Best regards,
> >
> > Do Duc Tuong,
> >
> > Renewable Energy Advisor
> > SNV Vietnam
> >
> >
> >
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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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