Dear Julien Re sawdust burning:
Some users have a wooden small stick left in the hole (horizontal one at the bottom) to serve as a continuous source of flame. It is much more reliable and can be run at lower power than sawdust alone. Regards Crispin Sent from my BlackBerry device on the Rogers Wireless Network -----Original Message----- From: Julien Winter <[email protected]> Sender: "Stoves" <[email protected]> Date: Fri, 19 Apr 2013 16:03:35 To: Discussion of biomass cooking stoves<[email protected]> Reply-To: Discussion of biomass cooking stoves <[email protected]> Subject: Re: [Stoves] The Art of Using Grass Bundles in TLUD Stoves Dear Martin, Anand, and stovers; Thank you for reporting on trials with crop residues and leaves, and introducing grinding as a possible solution. It is not surprising to hear of this research from India, where much work has been done. One of the readers of this topic sent me an excellent paper on burning sawdust in a stove with a vertical hole ("port") down the middle of the fuel bed, and lighting the fuel from the bottom. Multiple "ports" worked even better. The reference and abstract are below. Searching in the Web of Science, I don't find that anyone has published any advances on their technique; work has continued using pelleted fuel. Regards, Julien _________________________ Dixit, CS Bhaskar; Paul, PJ; Mukunda, HS. 2006. Part I: Experimental studies on a pulverized fuel stove. Biomass and Bioenergy 30: 673-683. ABSTRACT: This paper is concerned with development of a pulverised fuel stove with improved conversion efficiency and minimal emissions at near constant power level without the use of external power. The design originates from a cylindrical sawdust stove with a central porthole being lit from the bottom. Such a stove will have a flame in port with enhanced sooting tendency. For similar configuration, stable premixed combustion behaviour of the combustible gases from the port of the fuel block (known as the gasification mode) has been achieved by use of air supply through a thin slot at the bottom, for at least 30 min of stove operation. In order to ensure stable combustion of the gases at exit, a metal device is used. In an attempt to extend gasification duration, studies are conducted in single port configuration having air entry from the bottom with a horizontal baffle to control the flow rate. This configuration worked in gasification mode for about 20 min but there have been problems of flame extinction. To overcome these drawbacks multi-port design with vertical air entry is employed with success. The stove has exhibited conversion efficiency in excess of 37% due to well focused nature of flame at exit. CO emission factors are about 12 g / kg fuel, a performance superior to conventional biomass stoves (ca. 45 g / kg). NOx emission factors are about 1 g / kg fuel which falls in the range of reported data for NOx. Studies with different pulverised leafy fuels have indicated these fuels have lower volatile release rates and therefore exhibit lower power level operation for a given port configuration compared to sawdust fuel. __________________________________________________ -- Julien Winter Cobourg, ON, CANADA _______________________________________________ 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/
