Dear Crispin and all,
To cut-to-the-chase and avoid all the testing that likely means little or endless interpretation of all the variables I am thinking a test on biomass where you burn it and determine burn characteristics. Suggest making a series of pipes of different 'standard sizes' with metal screen at the bottom. Add a known and established amount of fire starter then tap in the fuel. With Boy Scout skills light the starter from below the screen using one match and then monitor the progress of the combustion. Could be temperature of the pipe, height of the flame for X duration, completeness of combustion etc. all with natural draft. This could better predict how a specific fuel will work in a group of stoves. The pipes size could be based on standard size of typical combustion chambers. One could report 'Using standard pipe #2 this fuel gave the following characteristic: Temperature profile along the pipe, temperature profile 30cm above pipe, length of time to completion, Biomass left, smoke observed etc.' A simple test anyone could do when describing the fuel used when testing and comparing a group of stoves. Regards Frank Thanks Frank Shields BioChar Division Control Laboratories, Inc. 42 Hangar Way Watsonville, CE 95076 (831) 724-5422 tel (81) 724-3188 fax <mailto:[email protected]> [email protected] www.controllabs.com From: Stoves [mailto:[email protected]] On Behalf Of Crispin Pemberton-Pigott Sent: Wednesday, June 12, 2013 12:12 PM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] Burning wet wood Dear Frank Burning very dry wood is difficult and it makes a lot of smoke. That is why stoves should not be evaluated with very dry wood when they are designed to burn 'ordinary wood'. If you get the conditions right for the early fire they are double-guaranteed o be wrong for the late fire. Much better a continuous input of damp material. Regards Crispin ++++++ Dear Crispin, Tom and all, I would think a batch mode would be better. A continuous mode means you have water vapor all the time. In batch mode one would heat and find the gas temperature goes to 100c. Then when the water is finally burned off the temperature rises and you can then push the fuel forward to do what you want to do with the now dry wood. Not sure this happens and have not seen a graph of this but think this is what would happen. Frank
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