Highlighted below are copies of two related posts from a discussion thread on the Stoves Listserv.
Joshua Guinto writes:
Re: [Stoves] Fuels of the future
Dear Crispin, Paul and everyone
Let me jump into the conversation.
I am now in the midst of the gasifier stove i am fabricating and the abundant supply of pili shells. Pili *(canarium ovatum)* is an endemic species of my place here at the Bicol Region which is south of Manila. The shells are very much heavier than macadamia nuts and has a density of 0.87 grams/cm3.
Two days ago we began hauling 4 tons of the shells to become my stocks of fuel. I will sell the shells along with my PapaBrick Stove. And then, while we are hauling the shells, we were offered another 6 tons of shells from the neighbor farm, both in the same village. I used to purchase the shells from another village where to my best estimate, there is more than 10 tons per month that are very much underused. This supply is expected to increase as more farms have planted thousands of pili trees as the farmers got more awareness with the use of the shell for gasifier stoves.
On the other hand, the PapaBrick Stove is giving us satisfying performance, now that we know better how to use it can perform as a TLUD gasifier stove during the cold start phase and then work as a rocket during the hot start phase in a continuous mode.
One load receives 1.25 kg of the shells and runs for 75 minutes of very clean flame, boils 4 liter of water in 14 minutes during the cold start phase and then 9 minutes during the hot start phase.
After the flame has gone out, we can harvest an average of 2.73 grams of char from the raw fuel of 1.25 kg or about 21 % recovery.
Going further i fabricated a lantern on top of the stove. And it was very satisfying.
*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
Dr TLUD writes (in response):
Re: [Stoves] Fuels of the future
Truly awesome!!!!!!!!! [Based on very little information, but he tells us truly important info about fuel and boiling time and combustion technology. This truly looks promising.]
I suspect that you are on the verge of a major shift in cooking stoves. Your attachment with photos in your original message should be seen by all. It will be soon placed on the www.drtlud.com website.
What I am reading and interpreting is this:
1. Abundant supply of a fuel that is appropriate in size, energy content, moisture, etc. Literally an agricultural “refuse” for free or for the cost of transport. Producers will start selling it, but it is already UNDER the price of other fuels, so the price will only rise to the level that the market will bear.
2. A CERAMIC / MUD / CLAY stove, made by a master of clay stoves. We would like to know the cost of the stove. And how easily can it be made ? Importance of clay is in next item. And it should be able to handle numerous other appropriate biomass fuels, but doing just one (pili nut shells) is sufficient for starting and establishing what can be accomplished.
3. You operate in TLUD mode (correctly characterized by the downward migratory pyrolytic fron MPF). And then you continue to burn the created char while adding (please explain where and how) additional fuel. The result is the high heat in the char-bed, but without the metal parts that are damaged by high heat. Ceramics to the rescue!!!! Continuous burning.
4. Plus you are demonstrating the making of light. Very nice.
Best wishes. Please tell us more. And about the important issues of user acceptance. Many of us are willing to be of assistance. In some ways you are only scratching the surface of what you are demonstrating. Congratulations.
And are you going to the GACC Forum in Ghana in November 10 – 13?
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Skype: paultlud Phone: +1-309-452-7072