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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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'>I didn’t mean anything quite so personal. :-/<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'>Most of the biochar research has focused on pyrolitic char and not on combustion or gasification char. There is a clear bias toward pyrolysis, or low temperature char. Can anyone really say this is the way that the Amazonians, or anyone else, created the charcoal that we find in the terra preta soils? Or was it smoldering combustion, staged combustion (a la Alex English), or a combination of pyrolysis, gasification and combustion? I know that I have had a lot of bad slash and straw burns that have left a lot more char on the ground than ash. Are there “signatures” in the terra preta char that point specifically to pyrolysis, gasification or combustion?  <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 see biochar production growing in stages. For the time being a large quantity of char that is sold as Biochar is actually char from gasification. As biochar markets grow we might expect to find more pyrolytic char made “for purpose” but now we have some pyrolitic char and byproducts of gasification (including TLUDs) and combustion. <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 “high temperature” gasifier char performs very well and in some applications better than pyrolytic char. Several studies (and some commercial producers) have found that conditioning the char through partially oxidation (to higher temperature) enhances nutrient retention. These products are for improving soil fertility , not necessarily to replace activated carbon. So why not consider CO2 gasification as a possible process step?     <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'>One major producer of char in California uses a downdraft gasifier. In a downdraft gasifier wood devolatilizes at or above the oxidation zone. Volatile carbon is oxidized by the air injected from nozzles to make CO2. The hot CO2 reacts with the char to form CO and H2. This occurs in the “reduction zone”. The reduction zone is often shown as a deep bed of carbon but in fact it is usually only a couple of inches thick. Large chips reduce to powdered char in less than 2 inches where gas temperatures are 800-900C. The resultant producer gas is a mixture of this CO from reducing char and the devolatilized gas. Taking CO2 and reacting it with charcoal at 800-900C as Purdue has done is not a lot different so the qualities of the char should be similar. <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 think we need to explore all avenues of producing char and energy <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>      </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Slow pyrolysis – 25%-30% char; 30% oil+gas<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>      </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Fast pyrolysis – 15% char; 60% oil<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>      </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Gasification – 5%-25% char; 75%-95% energy<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'>      </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Combustion – 1-5% char; 95% heat<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'>Tom<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'>  <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'><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><a name="_MailEndCompose"><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></a></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"'> biochar@yahoogroups.com [mailto:biochar@yahoogroups.com] <b>On Behalf Of </b>Ronal W. Larson<br><b>Sent:</b> Monday, December 23, 2013 2:53 PM<br><b>To:</b> Biochar; Tom Miles<br><b>Cc:</b> Crispin Pemberton-Pigott; Gasification-Request<br><b>Subject:</b> Re: [biochar] Pine char gasification<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>  <o:p></o:p></p><div id=ygrp-mlmsg><div id=ygrp-msg><div id=ygrp-text><p>Tom etal:<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>   1.   I’m not sure I want to accept the “philia” part of this message  (“philia” goes with “abnormal” and pedophilia at one google site).  I found the word agape - but that sounds presumptuous.  But I do admit to being at the non-sensical end of the char spectrum.  Maybe charphilia is apt.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>  2.  I know close to zero about any part of gasification, but I can understand why one would promote the idea of recycling the CO2 to get more gas (eventually the Purdue group wants liquid, it seems).  But that has to result in less char - and apparently leaves much higher temperature char.  Eventually it is almost all CO2, for gasification, but I worry that the char produced this (high temperature) way might only be suited to replace AC = activated carbon.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>  3.  Since Alex English name came up today, we should note that he also recycles CO2.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>  4.  The dogma of the cult I am in says more char beats more heat, gas or liquid, so I will look forward to some proof that is not correct. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal> Good luck to the Purdue folk.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Ron<o:p></o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>On Dec 23, 2013, at 12:58 PM, Tom Miles <<a href="mailto:tmiles@trmiles.com">tmiles@trmiles.com</a>> wrote:<o:p></o:p></p></div><p class=MsoNormal><br><br><o:p></o:p></p><div><div id=ygrp-mlmsg><div id=ygrp-msg><div id=ygrp-text><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif"'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>Ron,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>This work is very important for both the biochar and gasification lists. Biochar will be produced at the large, or even small, scale as a co-product of energy (liquid fuels and/or power). The most efficient way to generate power from the gases and vapors from slow pyrolysis (50% of the energy) is probably through charcoal gasification (e.g. run the pyrolysis gases through a charcoal gasifier). There are commercial systems under development to make char and power in this way. There are also commercial systems under development to make liquid fuels through combinations of pyrolysis and gasification. The char products from these and fast pyrolysis processes run from 0% to about 15% of fuel input. I don’t know the fuel or char yield for Cool Planet.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>This particular study prepared the char with high temperature (826 C) nitrogen.  Wood particles (chips, sawdust) and resultant char particles in this study are larger than for other char studies. Obs</span><o:p></o:p></p></div></div></div></div></div><p class=MsoNormal><br><br><o:p></o:p></p><div><div id=ygrp-mlmsg><div id=ygrp-msg><div id=ygrp-text><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>ervations about BET surface area, particle size and the char morphology are very interesting. The char morphology looks different than the SEM images that we typically see. From gasification and pyrolysis we know that pine carbonizes differently than hardwood so it is interesting to see the shredded fibrous appearance of the pine char in this study compared to the neat geometric structures that we often see, which is probably from hardwood chars. The authors observe that the macropore volume is significantly greater than the mesopore or micropore volume of the char. They observe “numerous wide tunnel protruding into the char particles. . . [that] may provide pathways for bulk transport of CO2 into the particle.”</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>Char conversion numbers are interesting. Only 10-12% of the char was gasified at 726 C (BET 391 m3/g) while 98-100% was converted at 896 C. Surface area increased with conversion but not much greater than the 35-47% conversion at 776 C so CO2 gasification could be used to increase surface area at the expense of half of char (660 m3/g). Meso and micro pore volume doubles at the higher rate but stays pretty constant above 776 C. Researchers conclude that a significant proportion of the pore volume is within macro pores although the majority of the internal surface area is within micro pores.  They point out that the mass loss with surface gasification occurs within the smaller pores leading to pore widening.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>Researchers explain that the char gasification process involves three steps: (1) adsorption of the gas-phase species to the char surface, (2) surface reactions, and (3) desorption of the gasification products from the surface. The latter is the rate limiting process.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>Recycling CO2 from gasification to gasify the char is an interesting concept that may apply to modifying char properties (e.g. increase surface area) from pyrolysis or recovering energy (heat, power, syngas) in an industrial setting.   </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>There is very little information about gasification or combustion chars. Sometimes it helps to step back from our char-philia (and gaso-phobia) to see what products combined pyrolysis and gasification can produce.  </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>Tom</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>  </span><o:p></o:p></p><div id=ygrp-mlmsg><div id=ygrp-msg><div id=ygrp-text><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;color:#1F497D'>RL><span class=apple-converted-space> </span></span></b>don’t see any relevance to the biochar list.  (Except if this work shows that char is more valuable in the ground and/or that an approach like Cool Planet’s is more efficient.)  On the biochar list, we should want BOTH high value fuels and charcoal.   <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>     This Purdue work is all about gasification of char - not pyrolysis.   I am not sure whether the topic is appropriate for “gasification” either, since that list seems to want gases for engines, not liquids.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div></div></div></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif"'><o:p> </o:p></span></p></div></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></div><div><p class=MsoNormal><span style='color:white'>__._,_.___<o:p></o:p></span></p></div><table class=MsoNormalTable border=0 cellspacing=3 cellpadding=0><tr><td style='border:solid #EAEAEA 1.0pt;background:#F2F2F2;padding:5.25pt 3.75pt 3.75pt 3.75pt'><p class=MsoNormal style='mso-margin-top-alt:15.0pt;margin-right:0in;margin-bottom:7.5pt;margin-left:0in'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:white'><a href="http://groups.yahoo.com/group/biochar/post;_ylc=X3oDMTJyaHZycmxnBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRtc2dJZAMxNTg0MQRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzEzODc4MzkxNzc-?act=reply&messageNum=15841"><span style='color:#2D50FD;text-decoration:none'>Reply via web post</span></a> <o:p></o:p></span></b></p></td><td style='border:solid #EAEAEA 1.0pt;background:#F2F2F2;padding:5.25pt 3.75pt 3.75pt 3.75pt'><p class=MsoNormal style='mso-margin-top-alt:15.0pt;margin-right:0in;margin-bottom:7.5pt;margin-left:0in'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:white'><a href="mailto:rongretlarson@comcast.net?subject=Re%3A%20%5Bbiochar%5D%20Pine%20char%20gasification"><span style='color:#2D50FD;text-decoration:none'>Reply to sender </span></a><o:p></o:p></span></p></td><td style='border:solid #EAEAEA 1.0pt;background:#F2F2F2;padding:5.25pt 3.75pt 3.75pt 3.75pt'><p class=MsoNormal style='mso-margin-top-alt:15.0pt;margin-right:0in;margin-bottom:7.5pt;margin-left:0in'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:white'><a href="mailto:biochar@yahoogroups.com?subject=Re%3A%20%5Bbiochar%5D%20Pine%20char%20gasification"><span style='color:#2D50FD;text-decoration:none'>Reply to group </span></a><o:p></o:p></span></p></td><td style='border:solid #EAEAEA 1.0pt;background:#F2F2F2;padding:5.25pt 3.75pt 3.75pt 3.75pt'><p class=MsoNormal style='mso-margin-top-alt:15.0pt;margin-right:0in;margin-bottom:7.5pt;margin-left:0in'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:white'><a href="http://groups.yahoo.com/group/biochar/post;_ylc=X3oDMTJmbDg4NHFvBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRzZWMDZnRyBHNsawNudHBjBHN0aW1lAzEzODc4MzkxNzc-"><span style='color:#2D50FD;text-decoration:none'>Start a New Topic</span></a> <o:p></o:p></span></p></td><td style='border:solid #EAEAEA 1.0pt;background:#F2F2F2;padding:5.25pt 3.75pt 3.75pt 3.75pt'><p class=MsoNormal style='mso-margin-top-alt:15.0pt;margin-right:0in;margin-bottom:7.5pt;margin-left:0in'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#2D50FD'><a href="http://groups.yahoo.com/group/biochar/message/15835;_ylc=X3oDMTM3MjdzZGtoBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRtc2dJZAMxNTg0MQRzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzEzODc4MzkxNzcEdHBjSWQDMTU4MzU-"><span style='color:#2D50FD;text-decoration:none'>Messages in this topic</span></a> (5) <o:p></o:p></span></p></td></tr></table><div style='margin-bottom:7.5pt' id=ygrp-vital><p class=MsoNormal style='background:#F2F2F2'><b><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#333333;text-transform:uppercase'>Recent Activity:</span></b><span style='font-size:7.5pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p><div style='mso-element:para-border-div;border:none;border-right:solid black 1.0pt;padding:0in 4.0pt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