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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'>Dear Crispin and all,<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'>I never liked trusting a reading on an instrument that is not calibrated before each use and for the situation applied (when possible). You have the readings, air flow reading and dilution to get the rate Hydrogen is coming off in instrument range. If you set the probe in a constant location, set the dilution then add hydrogen into the air stream from a gas tank at a known rate typical of what is seen. You can calibrate the instrument for the situation. Make adjustments to the airflow (using those reading true or not) to plot how linear the curve is. Forget the numbers given on the airflow and H meter. Just use units of measure knowing what the true Hydrogen reading should be because you know the amount released from the tank into the system. This system for all the readings. <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'>I realize when biomass gasses are given off there may be interferences and we can’t exactly use standard additions (H will explode!) to see how well they work. <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'>I think Dean does something like this when setting up his system(?). <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'>Frank<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;color:#1F497D'>Frank Shields<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;color:#1F497D'>Control Laboratories; Inc.<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;color:#1F497D'>42 Hangar Way<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;color:#1F497D'>Watsonville, CA 95076<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;color:#1F497D'>(831) 724-5422 tel<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;color:#1F497D'>(831) 724-3188 fax<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;color:#1F497D'>frank@biocharlab.com<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;color:#1F497D'>www.controllabs.com<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></b></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Stoves [mailto:stoves-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Crispin Pemberton-Pigott<br><b>Sent:</b> Wednesday, September 11, 2013 5:17 AM<br><b>To:</b> 'Discussion of biomass cooking stoves'<br><b>Subject:</b> Re: [Stoves] Hydrogen from charcoal<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoPlainText><span lang=EN-CA>Dear Andrew<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>Hydrogen is highly reactive in gaseous form and influences many electrochemical cells. It is detected electrically, usually in the CO cell. I agree with Harold that we should rule out some sort of instrument error, but then the CO level is compensated for the H2 meaning they both should be working if the H2 is.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>It remains an interesting problem. <o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>Re the town gas, a major step in the production was to spray the hot coal with water to fracture it creating CO and H2 in the process (water gas) and when I first heard that I was amazed.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>What crazy guy thought of that??<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA style='font-family:Wingdings'>J</span><span lang=EN-CA> <o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA>Crispin<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>>Charcoal stove, was operating, but "everything was cooled"??? Meaning <o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA>>that there was no "serious" (as in glowing red) char in the stove, but <o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA>>emissions were still coming off, correct?<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>If this was the case then I would expect the char would still be undergoing pyrolysis and the higher tar molecules splitting. As you all know town gas was originally made by heating coal to drive off CO and H2.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>That these molecules would survive the combustion is interesting but could simply be the dilution by other combustion products putting the air:fuel ratio out of range.<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>How does a hydrogen cell sense the presence of hydrogen i.e. what mechanism is involved in the measuring instrument?<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoPlainText><span lang=EN-CA>AJH<o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><o:p> </o:p></span></p></div></body></html>