[Stoves] coconut usage in improved stoves continued

[mtrevor]

Gee it looks like I have piqued a little interest here. Actually most know coconut waste has long been an interest of mine.
There is a volumonus amount of it and invarious form can be rather obnoxious. Tradational uses in lots of place
are well developed. However the usages are also some of the exact issues we are attacking especially 
smoke smoke and smoke. Interestingly enough there are even studies the indicate composted materials from
demonstrate allopathy to other plants as well. With the amount of coconuts in the Phillipines if this renewed 
interest can help Rebecca it can have huge implications. She and I are interested in all aspects of coconut stuff
husk shell fronds flower spaths and as she pointed out even "Tuba" grin
Michael 
Majuro
Marshall Islands


  From: Crispin Pemberton-Pigott 
  To: 'Discussion of biomass cooking stoves' 
  Sent: Monday, June 17, 2013 6:06 AM
  Subject: Re: [Stoves] coconut usage in improved stoves continued


  Dear All

   

  I have spent some time trying to burn whole coconut husks – some may remember the reported experiments some time in 2003.

   

  The motivation was the fact that Mozambique has a huge amount of the material lying around and while it is used for a domestic fuel, it is pretty awful. It is heaped around pots and burned with a great deal of smoke.

   

  I was in Swaziland at the time (where New Dawn Engineering is located) and was developing the Vesto. A number of experiments were conducted using a Tsotso stove which can burn just about anything. The observations were that the husks can burn very cleanly (visibly clean, at least) if it is burning in a staged process. While the fuel can hold considerable moisture, once it is heated to the point of getting rid of the steam, it is able to burn well, producing a white smoke that supports combustion if given preheated secondary air.

   

  In order to sustain a burn it is essential that the fuel be dried enough. It is likely that any practical device will have a method of supply new fuel continuously or in batches, perhaps pushed in from the side or the bottom. Preheating the primary air is essential because of the retained moisture.

   

  Because the ‘fuel particles’ are so large, the device will have to be large. If it is a TLUD or downdraft (BLDD) stove it implies that he chamber will be >6 times the particle size. If the husks are not cut into pieces that implies a diameter of perhaps 60-75 cm. I guess the power level would 10-20 kW. To be useful the things should perhaps be 1.5-2 metres high.

   

  At that size, it could be used to make soft charcoal on a reasonable scale for briquetting. Given the vast local market for charcoal in Mozambique it might make sense, all things considered.

   

  Regards

  Crispin

   

   

   

  Paul

   

  What would a TLUD sized for coconut husks look like? Can you suggest dimensions and a fuel size?

   

  Tom







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