[Stoves] Fuel Management - Bamboo Sawdust

[Tony Vovers]

Crispin - many thanks for the new suggestion.

I have found source of firebricks and fire cement in Surabaya. PT. BENTENG
API TECHNIC - they seem to be a very large facility. Shipping costs to Bali
more than the product!

Small centrifugal blowers seem to be used all over the place here by sate
vendors cooking with charcoal.
I have not quite envisaged where the cook will fit in this type of design,
I assume the blower and sawdust feed would come in from the side  or middle
of something like a rocket stove burn chamber, with a small fire inside to
keep things burning??  with the exhaust coming out at the top to the cook.

It is well worth investigating this approach for this application or our
other pet project a forge..... maybe able to do it without charcoal...

Your 2 new key words (Sawdust combustor) unleashed the power of googles
search engine.

This interesting looking device from India looks like it gasifies the
sawdust in the burner tube and then uses the gas to maintain the in tube
gasification process without using any bricks:
http://mgiri.org/wp-content/uploads/2014/05/Sawdust_Combuster.pdf

 What would be your vote??
Try to burn the sawdust outside the flow tube in a burn chamber?
or gasify the sawdust inside the tube as in this india example and burn the
gases?

In the meantime I don't want to give up totally on fuel management
(pelletizing) as it is a solution that can create micro enterprises in the
area particularly if rice husks are put in the picture. Though these days
the pigs seem to be very happy consuming most of that.
 Hopefully I get some ideas on that front from the stove community.

Great Ideas thanks for the feedback

TonyV

Tony Vovers
+1 281 7381000 (VOIP)
+62 (813) 3888 9062 (HP)

On Wed, Mar 15, 2017 at 1:09 AM, Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Tony
>
> One of the good uses of sawdust when you have electricity is a simple fan
> and sawdust combustor.
>
> If you start a fire and spray air containing sawdust into it, you can get
> a really hot clean fire. It will probably be best to do it against a
> ceramic wall, like fire brick.
>
> The bricks are available from Jakarta, if you are patient. They are used
> on Lombok to make combustors for palm kernel shells so you may find them
> easily ‎in Bali.
>
> The burners that work this way use quite high pressure (centrifugal) fans,
> not the propeller type. ‎The sawdust is dropped into a hole so it is picked
> up by the air and carried into the fire.
>
> In short, the fuel is not loaded into the stove, it is blown in ‎a little
> at a time.
>
> Because it is an institutional stove, you can use the fire power. There
> are such small fans widely used by ‎Lombok blacksmiths among others. They
> are all 450 watts because that is the limit for a residential home (2 amps).
>
> It would be easy to check. You might be able to lead a pipe into the fire
> chamber ‎and fill it with sawdust, loosely. As it burns at the bottom, it
> will fall down. The fan will burn only the bit exposed at the bottom. Build
> a structure around it.
>
> Regards
> Crispin
>
>
>
> Dear stovers
>
> Looking for some advice or suggestions to utilise a source of excess
> sawdust for institutional cookstoves at a school. in Indonesia.
>
> After several attempts with various devices to burn the sawdust directly
> have failed to be accepted by the kitchen over time I am now looking to
> better fuel management as the solution.
>
> Looking for simple lowcost options for Pelletizing or making briquettes
> from the sawdust.
>
> In various postings I have found reference to managing sawdust/husk fuel
> using cowdung as a binding material and simple screw or lever based press
> to create briquettes or cakes that are dried.
>
> Although dung is locally available there is considerable resistance from
> the staff to incorporate dung into the kitchen setting as part of the fuel.
>
> The volume of source material available (6-8sacks/day) does not justify a
> pelletizing machine and we feel this opportunity could make for a good
> student lead project to create a sustainable fuel management process for
> the kitchen/support staff.
>
> The available sawdust fuel is from treated bamboo from local factory which
> has some moisture content (18-20%) at time it is created.
>
> I have seen reference to other "binding materials" or even partial
> pyrolysis to bind the fuel and am looking for some suggestions of things to
> try for a local pelletizing/briquetting process.
> Or some arguments to accept dung as binding material.
>
> We need to generate enough fuel to feed 6-8 stoves operating over 2-4
> hours food prep time on a daily or twice daily basis with reasonable
> efficiency.
>
> Suggestions??
>
> Tony Vovers
> +62 (813) 3888 9062 <0813-3888-9062> (HP)
>
>
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