Crispin, The hopper fed coal burners sounds very interesting. I have no experience with coal. The thing I spent the most time on with my hopper fed charcoal smoke roasters was the high temp access door/ cap for the top of hopper. How are the stove developers sealing off the hoppers? Lanny ----- Original Message ----- From: Crispin Pemberton-Pigott To: 'Discussion of biomass cooking stoves' Sent: Wednesday, July 31, 2013 6:30 PM Subject: Re: [Stoves] The TLC burner is new and improvedtechnology inbiomass burner design.
Dear Lanny Using a TLUD ignition and following that with a hopper fed burn is one good way to limit total emissions including the ignition period. This has relevance to testing of stoves where the ignition period is included in some test ratings and not in others. As the householder is exposed to everything from a fire, to me it seems sensible to include everything as part of the burn cycle. With an always-on device like a hot water boiler in a heating system there are arguably good reasons not to include the ignition period but (rather obviously) that is not part of normal operation. For an actual reduction in the exposure of cooks to smoke, the ignition period is a good target. Using a top-lit fire, like a good Boy Scout always does, is an easy way to reduce the overall total PM mass emitted. Incidentally there were 13 stoves tested for the Ulaanbaatar Clean Air Project (UB-CAP). There were 4 stoves selected for the second round of more intensive testing. All the selected stoves were ND-TLUD's. None are fan stoves. All achieved >90% reduction in emissions based on the old baseline. The reason I say 'old baseline' is that there has been a government mandated change in the fuel available in the city (from one coal source to another) and the new source is significantly different in composition. This resulted in a large increase in the baseline emissions, meaning the baseline stove produce much more smoke than it used to with the old fuel. In spite of this fuel change, the new stoves were held to the old emission baseline and were still able to dramatically reduce total PM and CO. Now that 100,000 stoves have been changed there are about 60,000 left. Some 45,000 will be change by the end of the year - at least that is the target. Depending on the quality of combustion, a coal fire can significantly affect the taste of food. With the newest stoves this is pretty good, though there is much to be learned about how to ignite a stove for minimum smoke. My feeling is that we can do better. Some stoves are still achieving 99.5% reductions even with the new fuel so 'much better' is not unrealistic. Regards Crispin From: Stoves [mailto:[email protected]] On Behalf Of Lanny Henson Sent: Wednesday, July 31, 2013 5:43 PM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] The TLC burner is new and improved technology inbiomass burner design. Crispin, If the wood is high quality like well seasoned oak the water I am boiling does not take on a nasty flavor. But of course high quality wood will be rare so a lid may be necessary. I have worked with hopper fed designs mostly charcoal cookers. I have one that will hold steady temps for 48 hours without refueling. You do have to pull the ashes every 12 hours though using briquettes. Me and my senior cooking partner cooked 2000 LB of pork for Habitat for Humanity an org that builds houses for the poor* with 4 cookers that I designed in two cooking sessions. We have another cook for the Knights of Columbus a Catholic org, this Labor day. I do two charity events a year. *The poor in the USA should be called the "Impovrich". Hopefully soon I will be able to help the "real poor" to which I have more sympathy. Lanny ----- Original Message ----- From: Crispin Pemberton-Pigott To: 'Discussion of biomass cooking stoves' Sent: Wednesday, July 31, 2013 4:59 PM Subject: Re: [Stoves] The TLC burner is new and improved technology inbiomass burner design. Dear Lanny Thanks for the interesting review. I think it will be of interest to the viewers to know that a pot heated all around will probably have to have a lid on it to prevent the food absorbing smells from the combustion. This is so important in certain regions that users can be observed waiting until 'a certain point' during the ignition of a stove before putting on the pot to avoid any contamination. There are cases where the smoke is desirable but that is more unusual. So there is no big issue for the cooker, it is just that the lid will probably have to be on when cooking and the flat lid-thing will have to clear the handle. I like the side loading. It is one approach to refuelling TLUDS's (top-lit updraft-started stoves). There is a variation on the theme in Mongolia which is a TLUD with hopper fed continuation, and it generates >50 Watts of electricity too. Regards Crispin The TLC burner ("Top Lit Combustor") is new technology. I believe it is step forward toward improved biomass cooking stove design. The TLC is a batch-fueled burner to which you can add fuel without creating smoke to boost the heat and extend the cooking time. This video demonstrates the "Top Lit Combustor" and the 'School Lunch Cooker's" amazing capability to burn damp and wet wood outdoor in the rain. Even adding a chunk wet concrete block does not stop this burner. The "School Lunch Cooker" uses the "TLC burner", and my "Exhausted Pot Shell" to cook outdoor in all weather. This stove just wants to cook! http://www.youtube.com/watch?v=uP2FVCeR8QQ Lanny Henson ---------------------------------------------------------------------------- _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/ ------------------------------------------------------------------------------ _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
_______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
