<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'><P>Alex:</P>
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<P> Your video showed a flame that I thought might be on the verge of going out. </P>
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<P> Can you give a turn-down ratio? </P>
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<P> Are you quite happy with this "double chimney" (which seems to add a lot of height)?<BR></P>
<P> What is the CO ratio in this video - and how good have you achieved?</P>
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<P>Ron</P>
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<P><B>差出人: </B>"Alex English" <english@kingston.net><BR><B>To: </B>"Discussion of biomass cooking stoves" <stoves@lists.bioenergylists.org><BR><B>送信済み: </B>2011年9月14日, 水曜日 午前 11:59:40<BR><B>件名: </B>Re: [Stoves] flames touching pot<BR><BR><BR><BR><BR>>> The question is why the yellow flame produces soot , but not the blue<BR>>> one ?<BR><BR>> The difficulty with achieving the same with wood gas is that the woodgas<BR>> is inherently hot as it meets the air. It would be interesting to cool<BR>> the gas from a tlud ( which would mean losing the fuel value of all the<BR>> tars present as they would condense) and then using a premixed burner on<BR>> the remaining cooled gases.<BR><BR>We've been here before....<BR><BR>The blue ones tend to be well oxygenated (mixed)or even too high in <BR>"excess air" from an efficiency point of view. I expect there are some <BR>additional interesting details for ag residues when it comes to <BR>chemical species and flame colour.<BR><BR>I have been able to get an all blue flame with wood pellets in a TLUD <BR>using my double chimney set up. It focuses the pryolysis gasses into a 2 <BR>inch diameter chimney and then adds "secondary" air (probably at least <BR>100% excess) to premix just before it widens to 4-6 inches and burns, <BR>blue. They haven't been the lowest CO/CO2 flames I've tested.<BR><BR> Hard to get a good picture, except at night.<BR><BR>http://www.youtube.com/watch?v=rvAwTnezVc8<BR><BR>Alex English<BR><BR>_______________________________________________<BR>Stoves mailing list<BR><BR>to Send a Message to the list, use the email address<BR>stoves@lists.bioenergylists.org<BR><BR>to UNSUBSCRIBE or Change your List Settings use the web page<BR>http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org<BR><BR>for more Biomass Cooking Stoves, News and Information see our web site:<BR>http://www.bioenergylists.org/<BR><BR></P></div></body></html>