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      Perhaps it should be called fixed-up carbon, its whats left after
      getting rid of the rif-raf that can['t tough it out in the kitchen
      when thing get hot.<br>
      <br>
      What other tests are there that would give a better representation
      of the biological recalcitrance of char?<br>
      <br>
      Alex<br>
      <br>
      On 05/02/2013 5:33 PM, Frank Shields wrote:<br>
    </div>
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      cite="mid:00da01ce03f0$c7f17e90$57d47bb0$@compostlab.com"
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        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Paul,<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">My
            biggest problem with the term ‘fixed carbon’ is that it is
            not a measurement of the carbon at all. Just the stuff left
            over after heating that can contain Oxygen and hydrogen. <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">Frank
            <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>
        <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";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
                Stoves [<a class="moz-txt-link-freetext" href="mailto:stoves-bounces@lists.bioenergylists.org">mailto:stoves-bounces@lists.bioenergylists.org</a>]
                <b>On Behalf Of </b>Paul Anderson<br>
                <b>Sent:</b> Tuesday, February 05, 2013 1:17 PM<br>
                <b>To:</b> Crispin Pemberton-Pigott; Discussion of
                biomass cooking stoves; <a class="moz-txt-link-abbreviated" href="mailto:biochar@yahoogroups.com">biochar@yahoogroups.com</a>; Hugh
                McLaughlin; Ron Larson; Thomas Reed<br>
                <b>Subject:</b> Re: [Stoves] Characteristics of biochar
                was Re: [biochar] grassifier & cedar chip char<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <div>
          <p class="MsoNormal">Crispin,  <br>
            <br>
            The influence of the coal industry on the testing is not a
            perfect match for what biomass gasification is all about and
            the testing of biomass and biochar.<br>
            <br>
            Biomass can be 50% carbon, but with decay it will all go to
            CO2.      Fixed carbon must be created in the carbonization
            process.<br>
            <br>
            In Atlanta airport about to fly to Uganda for 3 weeks.   I
            hope that others will comment, and not rely on me to reply.<br>
            <br>
            Paul<br>
            <br>
            <br>
            <o:p></o:p></p>
          <pre>Paul S. Anderson, PhD  aka "Dr TLUD"<o:p></o:p></pre>
          <pre>Email:  <a moz-do-not-send="true" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>   Skype: paultlud  Phone: +1-309-452-7072<o:p></o:p></pre>
          <pre>Website:  <a moz-do-not-send="true" href="http://www.drtlud.com">www.drtlud.com</a><o:p></o:p></pre>
          <p class="MsoNormal">On 2/5/2013 10:09 AM, Crispin
            Pemberton-Pigott wrote:<o:p></o:p></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear
              Paul</span><o:p></o:p></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
          <div>
            <p class="MsoListParagraph"
              style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
                style="mso-list:Ignore">1.<span style="font:7.0pt
                  "Times New Roman"">     </span></span><!--[endif]-->As
              far as I know, there is no "fixed carbon" in the
              biomass.   It is fixed during the process of
              carbonization/pyrolysis.<br>
              <br>
              <br>
              <o:p></o:p></p>
            <p class="MsoListParagraph"><span style="color:#1F497D">That
                is the problem – it you give a sample of wood to a lab
                and they perform a ‘coal analysis test’ on it you will
                get a report on the amount of ‘fixed carbon’. The point
                I was making is that it is a metric of convenience
                arising from the test procedure, not a reference to a
                material property.</span><o:p></o:p></p>
            <p class="MsoListParagraph"> <o:p></o:p></p>
            <p class="MsoListParagraph"><br>
              2.  Some biomass such as seeds have "oils" that vaporize
              or are volatile.   They are generally not pyrolyzed.  
              However, the lignin and other "stuff" in biomass is what
              is pyrolyzed and gives off pyrolytic gases that are
              volatile.   At low temperatures, the future volatiles are
              not yet in a form that can be called volatile.   But they
              will volatize when subjected to higher temperatures.<br>
              <br>
              I will accept what the chemist eventually clarify for us.<o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The
                % Volatiles are defined as that fraction that will boil
                (literally) at a given temperature. Choose you
                temperature. So when using a defined method, the result
                changes with the temperature your use.</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">See
                for example <a moz-do-not-send="true"
                  href="http://www.sigmatest.org/Coal-Testing-India.html">http://www.sigmatest.org/Coal-Testing-India.html</a></span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoNormal"
              style="line-height:13.5pt;background:white"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">“</span><b><span
style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#565656">Proximate
                  analysis - Moisture, Volatile matter, Ash and Fixed
                  Carbon: </span></b><o:p></o:p></p>
            <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:13.5pt;background:white"><span
style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#565656">“Proximate
                analysis indicates the percentage by weight of the Fixed
                Carbon, Volatiles, Ash, and Moisture Content in coal.
                The amounts of fixed carbon and volatile combustible
                matter directly contribute to the heating value of coal.
                Fixed carbon acts as a main heat generator during
                burning. High volatile matter content indicates easy
                ignition of fuel. The ash content is important in the
                design of the furnace grate, combustion volume,
                pollution control equipment and ash handling systems of
                a furnace.”</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This
                week we tried to get some tests of fuel content and were
                offered ‘coal analysis’ tests. It all sounds good but if
                you look into the procedure, you are not getting what
                you think – i.e. it is not an analysis of the elements
                that we are used to talking about in the biomass fuel
                biz.</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Getting
                a lab test result of this type using an instrument
                designed to do ANSI/ASTM D3172 tests <a
                  moz-do-not-send="true"
                  href="http://www.marsap.com/anamedinstru.com/coal.shtml">http://www.marsap.com/anamedinstru.com/coal.shtml</a>
                 and turning it into a ‘standard’ analysis is quite
                messy and I have a spreadsheet for doing that if you
                need it. It was necessary for the Asian Dev Bank (which
                built the SEET Lab) to do this because all that is
                available is standard coal analyses, but the HTP test
                method is more scientific in the sense that it uses the
                chemical composition of the fuel, not an approximation
                of it.  It is also necessary to get the ‘as received,
                ash-free’ heat content. Coal analysis methods gives AR
                (as received moisture), AD (after drying but not
                ‘actually dry’) and FC (fixed carbon, but not ‘actual
                carbon’ content). It also view some of the moisture as
                ‘inherent’.</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">There
                are two things which come back ‘wrong’: the moisture
                content and the carbon content. Finding out what the
                carbon content of the volatiles was is nearly
                impossible. The right approach is XRD and XRF.</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">To
                give you an idea of how far wrong the method is for
                determining Carbon, here is a standard test result of
                some coals and sawdust briquette. It is well known that
                the sawdust contains about 50% Carbon. It was rated as
                having 16% ‘fixed carbon’. In other words it is
                basically a useless measurement when it comes to biochar
                (or anything else).</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><img
                id="Picture_x0020_1"
                src="cid:part5.07030906.01000903@kingston.net"
                width="527" border="0" height="353"><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Crispin</span><o:p></o:p></p>
            <p class="MsoListParagraph" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:13.5pt;background:white"><span
style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#565656"> </span><o:p></o:p></p>
          </div>
          <p class="MsoNormal"> <o:p></o:p></p>
        </blockquote>
        <p class="MsoNormal"><o:p> </o:p></p>
      </div>
      <br>
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      <br>
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