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</o:shapelayout></xml><![endif]--></head><body bgcolor=white 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;mso-fareast-language:EN-US'>Dear Frank<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Charcoal largely burns C > CO2 and converts some of it back to CO in the hot zone above the hot coals. </span><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#003300'>[Frank >] </span></i></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#003300'>Above the hot coals or in the hot coals? To convert back from CO2 > CO we need more carbon. </span><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'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I found that directly above the middle of a good stove (under the pot) there is zero CO – I was amazed. But nearer the edges there is more.<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'>>If the excess air level is high it can create a lot of CO directly and not burn it. </span><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#003300'>[Frank >] </span></i></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#003300'>Is it because the gas is too cool? Molecules are spread too far apart to continue the complete combustion? Not enough hydrogen to aid in supporting continued complete combustion? </span><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'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>All the above. Well done.<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><b><i><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#003300'> [Frank >] I find the hydrogen is less than one percent in char. But moisture can increase the hydrogen is not tested directly after drying. Wonder if this water hydrogen is any help in these small stoves?</span></i></b><b><i><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></i></b></p><p class=MsoNormal><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></i></b></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Well that is the question of the hour – where does all the H2 come from?<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'>I checked a number of other tests and the correlation coefficient between CO and H2 varies a great deal. The 97.7% was interesting of course, but some are negative and some are 50%. I don’t think this is an instrument issue, it represents different combustion conditions, largely.<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 near the Forbidden City<o:p></o:p></span></p></div></body></html>