[Stoves] Fuels of the future

Thu Sep 10 18:43:34 CDT 2015

Dear Jed

The critical thing about the grate is that the fuel should feed down the grate by itself for the most part. At 10 degrees the grate needs to be shaken occasionally. That could be a ‘feature’ in some places, not in others. It depends on what you want. 

The figure of 20 degrees is not magic, it is just ‘more’. 

The grate gap will depend on the fuel. What you do not want is char in the ash if the intention was to burn it. What you describe is different of course.

Good luck with the trip. May you help to ‘stay the hand of the oppressor’.

Regards
Crispin

Dear Crispin

I use stainless steel rods 8mm with gaps of 8mm. This allows the pilinut shells to fall off after it has fully carbonized. Will adopt the idea of the tilted grate 20 degrees. 

Also Im struggling with TEGs. Its an amazing project and still cannot get it started. I suppose  it would be very easy to simply embedd the TEGs into the clay wall and poke the wiring out to a fan or a charger. Could you please tell me more. about this..

News on the side.... im contemplating about joining a humanitarian mission next week. There are close to 3,000 refugees that fled from a conflict zone. The place is Tandag in the province of Surigao del Sur. Their tribal leaders and their teacher were executed by a paramilitary group who was organized by the Philippine Army.. the  evacuees are in a sports complex. My friends are going for a feeding mission. am raising some funds for my plane fare. also thinking about bringing my stove and have it tested there... .. to cook, to make bio char.. to use the biochar for sanitation.. to make compost,.... to teach people on approtech.... 

Regards

Jed 

Joshua B. Guinto
Specialist, Appropriate Technology

MSc Management of AgroEcological Knowledge and Social Change (MAKS)

Wageningen University, The Netherlands 2006 to 2008

Recipient, International Fellowships Programme  Award (IFP) 2005

Ford Foundation 

2015-09-09 17:54 GMT-07:00 Crispin Pemberton-Pigott <crispinpigott at outlook.com <mailto:crispinpigott at outlook.com> >:

Dear Jeb

With that layout and refuelling you will able to offer something that can be run indefinitely. Very good. 

The way we handled the ‎coke and ash was to tilt the grate downwards toward the fire. In the set of drawings on my website (Library/Stoves/GTZ7) the grate is not tilted enough. It should be about 20 degrees at least. The far end is upturned a little to catch the coke/char and not let it pile up against the far wall. 

The TLUD fire is built on top of the grate perhaps 250 mm high.    The final version has a 50 watt 12 volt TEG on the heat exchanger with two computer fans cooling it. The idea is it can run a TV and lights. 

‎I found in experiments at YDD that the grate for wood should have quite small gaps - 4 to 5mm. It really reduces the char loss in the ash. For reasons which are not clear, round bars accomplish this better than flat upper surfaces. Still thinking about that. 

Regards 

Crispin 

Dear Crispin

I just realized now reading from your remarks... that what im doing is a cross draft gasifier. Thanks for bringing that up. 

The material from YDD will surely help. My crossdraft feeding of fuel on the side port comes in contact with the hot charcoal bed. The fresh fuel either comes on the side, or on the top of the hot char bed. But wood sticks can be poked under the hot char bed and they give better results. 

Im writing a narrative of the details of the anatomy of the stove as Dr. Paul requested. Will post it as soon as i was able to get the size of the document down to less than 1.5 MB. 

Regards

Jed 

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