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Dear Alex, Dean</div>
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<span style="font-size: initial; line-height: initial; text-align: initial; font-family: Calibri, 'Slate Pro', sans-serif;">That Reed reference is a good one. As biomass is about 40% oxygen by mass, there is a real chance one can have some combustion without
any air at all. There is almost enough oxygen to burn all the hydrogen in most biomass. That is a heat source that could leave all the carbon behind, in theory. In practise there will always be CO and H2 in the output from a retort. </span></div>
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<span style="font-size: initial; line-height: initial; text-align: initial; font-family: Calibri, 'Slate Pro', sans-serif;">Regards </span></div>
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<span style="font-size: initial; line-height: initial; text-align: initial; font-family: Calibri, 'Slate Pro', sans-serif;">Crispin </span></div>
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<div dir="ltr">Dean,
<div>There being oxygen in the chemical structure of biomass and oxygen in the spaces and cracks, a strict abstinence is difficult. In one of the Reed/Das handbooks there is a graph of the pyrolysis-gasification-combustion continuum, where the x axis goes from
say zero to %200 of stoichiometric oxygen/air. I think ( always roughly) gasification fit in the %20-%80 range with pyrolysis below and combustion above. The char and gas yield % was in there too. I'm sure folks could argue endlessly about where exactly to
place the demarcations.</div>
<div>Alex</div>
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<div class="x_gmail_quote">On Sat, May 16, 2015 at 6:50 PM, Dean Still <span dir="ltr">
<<a href="mailto:deankstill@gmail.com" target="_blank">deankstill@gmail.com</a>></span> wrote:<br>
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<div style="overflow:hidden; padding-bottom:20px">Hi All,</div>
</li></ol>
<div><span style="line-height:16.1200008392334px">When I look up the word pyrolysis I find the following:</span></div>
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<div style="overflow:hidden; padding-bottom:20px"><b style="font-size:16px; line-height:1.24">Pyrolysis</b><span style="font-size:16px; line-height:1.24"> </span><span style="font-size:16px; line-height:1.24">is a thermochemical decomposition of organic material
at elevated temperatures in the absence of oxygen (or any halogen). It involves the simultaneous change of chemical composition and physical phase, and is irreversible. The word is coined from the Greek-derived elements pyro "fire" and lysis "separating".</span></div>
</li><li style="margin:0px; padding:20px 20px 0px; border:0px; list-style:none; clear:none; line-height:1.24">
<div style="overflow:hidden; padding-bottom:20px"><span style="font-size:16px; line-height:1.24">However, I think that folks use it to describe what happens in a TLUD, etc? Isn't that gasification not pyrolysis because of the presence of some air?</span></div>
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<div><span style="font-size:16px; line-height:19.8400001525879px">Best,</span></div>
<div><span style="font-size:16px; line-height:19.8400001525879px"><br>
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<div><span style="font-size:16px; line-height:19.8400001525879px">Dean</span></div>
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