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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Ron<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Addressing only one sentence of your very interesting list: <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>“For those not having experience with TLUDs, Dean's reference to "no primary air can make it up", means that the oxygen is "entirely" used to produce carbon monoxide.”<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The Hydrogen in biomass (about 5.6%) requires almost exactly the amount of Oxygen available in it (46%) to create water. While CO can form at a low temperature, the tendency of Oxygen to react with Hydrogen is so strong that given a chance, biomass heated in a TLUD environment creates H2O. Lots of it. The thick fog of ‘smoke’ coming of a totally choked TLUD does have lots of CO in it but it has a heck of a lot more water (which we usually don’t measure).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It is really rare to find a normalised CO emissions factor (not concentration in the emerging gases) above 100,000 ppm. I have only see it once and I work with some of the wildest devices the imagination has produced. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So we need to talk about the produced numbers: If you multiply the measured CO number (the concentration) by the Excess Air (EA) present at the time adding 100% to the EA figure you get the CO emission factor <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>CO(ppm) * (EA+100%) = CO(EF) at O2=0% (the O2 is factored out). <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>An emission factor calculated in this manner makes it possible to compare any stove emission to any other without worrying that ‘the conditions’ were different. This normalises the conditions.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So, back to the CO. If the O2 available in the biomass (about 46% by mass) were turned into CO, it would create far more than 10% of the total non-O2 component of the total emissions. That 5.6% H2 mass is a heck of a lot of H atoms. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Normally it is unusual to see a CO(EF) above 50,000. In a single case I have seen +130,000 briefly during the test of an ‘improved stove’ which put it unfortunately into the category where many ‘improved stoves’ belong. That high a value does not seem to be able to be created without first heating the fuel quite a bit so I am expressing doubts that level could be created in a TLUD that was not first run as a regular fire. I mention this to support my conclusion that the O2 tends to create ‘fuel moisture’ very easily.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Biomass needs just a little more air (Oxygen) to completely use up the H2 and then breathe in whatever additional air would burn all the Carbon. In any real file, some of the C becomes CO and CO2 (surface reactions mentioned by Dr Tom Reed in a previous discussion).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Crispin<o:p></o:p></span></p></div></body></html>