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</o:shapelayout></xml><![endif]--></head><body 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'>I’m looking at the cold end, cooling from 200C down to 30C where coating has not been a problem. <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><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"'> gasification-bounces@lists.bioenergylists.org [mailto:gasification-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>linvent@aol.com<br><b>Sent:</b> Monday, July 16, 2012 3:12 AM<br><b>To:</b> gasification@lists.bioenergylists.org<br><b>Subject:</b> Re: [Gasification] Graphite Heat Exchangers for Producer Gas?<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><span class=apple-tab-span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> </span></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Not worth messing with in my opinion. 1. Any fixed surface will still coat, even at very low tar content. 2. At high temperature, C+CO, C+H2 reactions will eat up graphite, 3. if resin coated, will not handle temperature and solvents in the gas. <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Sincerely,<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Leland T. "Tom" Taylor<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Thermogenics Inc. <o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>-----Original Message-----<br>From: Viswanathan KS <<a href="mailto:viswanathanks@gmail.com">viswanathanks@gmail.com</a>><br>To: Discussion of biomass pyrolysis and gasification <<a href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</a>><br>Sent: Sun, Jul 15, 2012 10:12 pm<br>Subject: Re: [Gasification] Graphite Heat Exchangers for Producer Gas?<o:p></o:p></span></p><div id="AOLMsgPart_2_9f01319b-c231-4a80-8d6c-fa198083b386"><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Process for producing graphite tubes:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Quote<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Synthetic graphite is manufactured from crude oil cokes and pitch. The pasty mixture is shaped into <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>monolithic blocks or tubes. Tubes are extruded whereas blocks are usually vibration molded. The <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>shape is then carbonized at 900ºC (1650 F)for a few hours and then fully graphitised at 2900ºC (5250 <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>F) for several days. The block or tubes are then impregnated with synthetic resin that is then <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>polymerized to render them totally impervious to gases and fluids. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>The resulting material is fully corrosion resistant to most common acids (sulfuric acid, hydrochloric <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>acid and of course industrial phosphoric acid) and has a very high thermal conductivity of around 80 <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>W/m.K for tubes or 140 W/m.K for blocks when totally graphitised. The tube wall is quite thick, 6 <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>mm (1/4”) and the individual tubes are 3 meters (10’) long.<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Unquote <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>ksv<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>On Mon, Jul 16, 2012 at 9:27 AM, Bob Stuart <<a href="mailto:bobstuart@sasktel.net">bobstuart@sasktel.net</a>> wrote:<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>In the early days of graphite fiber/graphite matrix brake disks on race cars, the ceramic coating would sometimes crack, allowing oxygen onto the hot graphite. The result became known in the pits as "Designer Coal."</span><span class=hoenzb><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#888888'> </span><span style='color:#888888'><o:p></o:p></span></span></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#888888'>Bob<o:p></o:p></span></p></div><div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>On 15-Jul-12, at 9:50 PM, Viswanathan KS wrote:<o:p></o:p></span></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>IMO the graphite tubes are not coated.<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>On Mon, Jul 16, 2012 at 8:45 AM, Bob Stuart <<a href="mailto:bobstuart@sasktel.net">bobstuart@sasktel.net</a>> wrote:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Would the coating that protects the graphite from oxidation not also work on copper?</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#888888'><br><br>Bob</span><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'> <o:p></o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><br><br>On 15-Jul-12, at 8:10 PM, Tom Miles wrote:<o:p></o:p></span></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>Graphite heat exchangers are now used on domestic condensing hot water boilers. (See SGL Group.) Heat transfer is reportedly 8 times that of stainless steel. Why not use them for cooling and condensing producer gas?<br><br><br><br>Tom<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'>_______________________________________________<br>Gasification mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org</a><br><br>for more Gasifiers, News and Information see our web site:<br><a href="http://gasifiers.bioenergylists.org/" target="_blank">http://gasifiers.bioenergylists.org/</a><o:p></o:p></span></p></div></blockquote><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><br><br>_______________________________________________<br>Gasification mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org</a><br><br>for more Gasifiers, News and Information see our web site:<br><a href="http://gasifiers.bioenergylists.org/" target="_blank">http://gasifiers.bioenergylists.org/</a><o:p></o:p></span></p></div></div></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p><div><p class=MsoNormal><span 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target="_blank">http://gasifiers.bioenergylists.org</a>/<o:p></o:p></span></p></div></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><br>_______________________________________________<br>Gasification mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org</a><br><br>for more Gasifiers, News and Information see our web site:<br><a href="http://gasifiers.bioenergylists.org/" target="_blank">http://gasifiers.bioenergylists.org/</a><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div></div><div id="AOLMsgPart_3_9f01319b-c231-4a80-8d6c-fa198083b386"><pre style='background:white'><tt><span style='color:black'>_______________________________________________</span><o:p></o:p></tt></pre><pre style='background:white'><tt><span style='color:black'>Gasification mailing list<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'><o:p> </o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'>to Send a Message to the list, use the email address<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'><a href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</a><o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'><o:p> </o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'>to UNSUBSCRIBE or Change your List Settings use the web page<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'><a href="http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org</a><o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'><o:p> </o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'>for more Gasifiers, News and Information see our web site:<o:p></o:p></span></tt></pre><pre style='background:white'><tt><span style='color:black'><a href="http://gasifiers.bioenergylists.org/" target="_blank">http://gasifiers.bioenergylists.org/</a><o:p></o:p></span></tt></pre></div></div></div></body></html>