Sorry for the tedious repetitions, I keep sending the message accidently - virtual keyboard... :( The downdraft combustor can be very clean burn‎ing, it is agreed. A biomass burning DD stove was produced in Swaziland and test marketed around Johannesburg in 2004-2005. It also had a retrofit combustor that had an additional feature which was that the gas outlet was angled. This allowed the insert to be rotated with respect to the stove body sending the hottest gases directly against the side wall for space heating or against the side of a sunken pot for high efficiency cooking. I think it was the first DD stove that made a serious efforts to implement the 'floating fuel' approach to the grate, the grate was made from thin high temperature wire. The insert was conical at the bottom with preheated secondary air. It is also possible to cook on the upper side of such a layout, something incorporated into the BLDD stoves at the SeTAR Centre In Johannesburg now at version 6. The Wood burning BLDD 6 can cook three pots at once. The BLDD 3 developed in Mongolia was tuned to burn lignite and was the only stove available there in 2009 that could properly burn 50mm semi-coked briquettes. The DD approach still has much unexplored merit. To make char with a DD stove requires removing it at just the right time. It is easier to do that with a cross draft burner which is just as clean and easier to light. Regards Crispin Jason, I've taken a look at your website and the info about the "IntensiFire", however one of the main points of the project will be to produce biochar (for use with the compost that they are already making). If the IntensiFire is only meant to increase efficiency and to reduce emissions for wooid burning stoves, this may not be quite what we are looking for, although it might be possible to "adapt" the IntensiFire to the application in some way [?] (in order to maximize the efficiency and minimize the emissions) ~ although the total cost might be quite prohibitive, given that the IntensiFire (Mk II) is already starting at $499 NZD (not including shipping all the way from NZ to Canada). I will, however, keep your downdraft technology in mind as we move forward with our project. Regards, Lloyd |
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