Re: [Gasification] [Stoves] Natural draft TLUD turn-down

[Crispin Pemberton-Pigott]

Sorry for the tedious repetitions, I keep sending the message accidently. ‎ Dear Jason and Lloyd  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 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 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 bu 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 Helferty, Engineering Technologist Principal, Biochar Consulting (Canada) www.biochar-consulting.ca 48 Suncrest Blvd, Thornhill, ON, Canada 905-707-8754 CELL: 647-886-8754 Skype: lloyd.helferty Steering Committee coordinator Canadian Biochar Initiative (CBI) CURRENTS, A working group of Science for Peace http://www.scienceforpeace.ca/currents/ President, Co-founder & CBI Liaison, Biochar-Ontario National Office, Canadian Carbon Farming Initiative (CCFI) Organizing team member, 2013 N/A Biochar Symposium: www.carbon-negative.us/symposium Member of the Don Watershed Regeneration Council (DWRC) Manager, Biochar Offsets Group: http://www.linkedin.com/groups?home=&gid=2446475 Advisory Committee Member, IBI http://www.linkedin.com/groups?gid=1404717 http://www.facebook.com/group.php?gid=42237506675 http://groups.google.com/group/biochar-ontario http://www.meetup.com/biocharontario/ http://www.biocharontario.ca www.biochar.ca "Producing twice as much food with diminishing resources, without further loss of natural habitats and biodiversity and in a changing climate may be the greatest challenge facing humanity." - Lloyd Helferty On 2014-05-20 5:28 PM, Jason wrote: Dear Lloyd, what you require sounds like a possible application for the IntensiFire. I can't promise you open source or off the shelf, or even the capacity yet to build what you are after. Probably won't get much biochar either. What I can offer is super clean combustion (zero CO and possibly zero PM10) particularly with auger fed fuel to keep combustion in the sweet spot. I have also built a prototype woodstove that will burn green wood with no visible smoke. Kind Regards Jason http://www.intensifire.co.nz/ On Wed, May 21, 2014 at 7:14 AM, Lloyd Helferty wrote: Crispin (and all),  [CC; gasification list]   This is a very interesting conversation regarding ND TLUD power (heat) variability and its implications, and (as you know) I do have a keen interest in this topic since being introduced to the TLUD 'stove' concept back several years ago (by Dr. Anderson, when he came to Ontario to demonstrate his small "Champion" stove and similar devices at the Laepple farm in June 2009), especially since the TLUD is one of the few simple technologies that can produce biochar cleanly at a small (or possibly at a medium) scale for local use ~ while producing (hopefully) useful amounts of energy (heat).   What I am working on right now here in Toronto might interest you or others on this list.  I have been approached by a business in Toronto that would like to be able to implement a small-scale char-making technology at their manufacturing site in the Toronto area (GTA) that would utilize the (dry) 'residuals' from their food production process in order to make heat energy that could lower their (fossil) energy use [natural gas costs] while also turning their (dry) 'food waste' into a biochar (and/or high-char ash) that could be re-integrated back into a (wet) food composting system (vermicompost) that is already being implemented onsite at their operations here in the city.  The primary use of the heat would be to heat up water, but it would also be welcome if it could be used in the preparation of the 'raw' food (drying, roasting certain products to a certain temperature -- i.e. an 'oven') that goes into their recipes, which includes 'fair-trade' sourced (temperate and tropical) foodstuffs that have been either grown or imported into Canada in bulk, and which are prepared on-site (including de-hulling etc. of several of the key ingredients).   Essentially, this company would like to know if it might be possible to come up with either a "customized" or an "off-the-shelf" system that has a fairly small footprint (about the size of a shipping pallet, or ~16 sq. ft = 40" × 48", as commonly used in the food industry) that would be able to meet the following requirements: Provides space heating and/or hot water heating (for their kitchen), with the possibility also for using the heat for "roasting" their ingredients (@ ~140 Celsius max. -- possibly using a heat exchanger, if necessary). something flexible and rugged can accept multiple fuel inputs (different sized feedstocks, different moisture/energy content -- not just woodchips) no smoky emissions (after-burner, if necessary) so that it can meet local emissions regs   Of course they are interested also in custom of "commercial" gasifiers [as well], but small systems (stoves) that could do the job they are seeking might suffice, although they probably want the system to be as automated (hands off) as possible to that the minimum amount of human intervention is required... although it would need to be as low-cost as possible (almost a "DIY" system -- they could actually make it themselves since they do have some expertise, including a machinist & a "master builder" who has built and operated a series of gassifier stoves for several years and "who is more than capable of manufacturing" something -- if they had the 'plans' for an open-source system/design that could do the job).  Ideally this company would be interested in seeing 2 or 3 designs that might work for them (a few devices that they could initially assess)... so that they could work with the designers to get more details.  They would then choose a final design that they would then incorporate into their head office (operations), but then possibly also into a "franchise system" that they are designing (and that would operate like a "food truck" would in any city ~ except instead of the truck being electricity or natural gas or propane-powered, the 'portable' food production/processing system would operate partially off of its own 'waste'... and/or wood chips [or pellets] that could be produced or supplied locally ~ possibly even from chipped shipping pallets that have only transported food products -- i.e. clean, 'food-grade' "green waste" like the type that can be found at the back of nearly every supermarket in the country... including all the broken ones.) <shipping pallets photo> Regards, Lloyd Helferty <snip>

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