It would make sens to start with biogas production. Is there enough? Back of the envelope, I think you would need about 800-1000 m3 of biogas daily to supply the heating need you described. The modifications needed to a propane appliance would be a new burner, gas line and likely a gas blower, since the propane system relied on the pressure inside the propane tanks. Otherwise, you should be able to use all the rest of the structure and plumbing of the old boiler. I usually suggest adding a second burner that can work without removing the old burner (or figuring out a very quick and efficient changing method), so in case there is no biogas for a few days (cleaning, maintenance, etc.), the appliance can still run on propane. The economics of this switch, providing the biogas is available, are very good. <br>
<br>Best,<br><br>A<br><br><div class="gmail_quote">On Fri, Jan 7, 2011 at 8:20 AM, info <span dir="ltr"><<a href="mailto:info@thecogas.nl">info@thecogas.nl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div link="blue" vlink="purple" lang="NL"><div><p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">Edward,</span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">Propane and biogas cannot be integrated in one burner. You need a different burner head. You should go for a burner that can be removed and than interchanged. We have experience with biogas burners to be used for drying of tea and that works very well. The tea dryer is fitted both with diesel fired burners and biogas fired burners. The digester we used was a large 4000 m3 pvc reinforced ecobag digester with mixers and with plenty of biogas storage. For a photo look at </span><span lang="EN-US"> </span><span style="color: rgb(31, 73, 125);" lang="EN-US"><a href="http://www.thecogas.nl/download/Indonesia%20factsheet%20eng.pdf" target="_blank">http://www.thecogas.nl/download/Indonesia%20factsheet%20eng.pdf</a></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US"> </span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US">Theo Bijman</span></p><p class="MsoNormal"><span style="color: rgb(31, 73, 125);" lang="EN-US"> </span></p>
<div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; padding: 3pt 0cm 0cm;"><p class="MsoNormal"><b><span style="font-size: 10pt;">Van:</span></b><span style="font-size: 10pt;"> <a href="mailto:digestion-bounces@lists.bioenergylists.org" target="_blank">digestion-bounces@lists.bioenergylists.org</a> [mailto:<a href="mailto:digestion-bounces@lists.bioenergylists.org" target="_blank">digestion-bounces@lists.bioenergylists.org</a>] <b>Namens </b>Edward Matos<br>
<b>Gepost om:</b> vrijdag 7 januari 2011 8:42<br><b>Gepost naar:</b> Archief van info<br><b>Discussie:</b> [Digestion] 250kW hot water biogas boiler<br><b>Onderwerp:</b> [Digestion] 250kW hot water biogas boiler</span></p>
</div></div><div><div></div><div class="h5"><p class="MsoNormal"> </p><div><p class="MsoNormal"><span lang="EN-GB">Dear biodigestion experts,</span></p><p class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal">
<span lang="EN-GB">A milk processing company in our vicinity (Tanga, Tanzania) has had a lasting interest in converting its milk pasteurising process from running on propane to running on biogas. I am doing them a little favour by helping them to make a feasibility study and find the right people that will make this happen. Unfortunately I have very little experience in biogas combustion and would like to find out if anyone here is/knows someone who could help us on this subject.</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal"><span lang="EN-GB">I am looking for a someone that could make a cost-effective modification/replacement to the current burner, so that it can may run interchangeably on biogas or propane. I’ve included a few system specifications below:</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal"><span lang="EN-GB">Burner make/model: Buderus Logano SE635</span></p><p class="MsoNormal"><span lang="EN-GB">Gas regulator make: Dreizler</span></p>
<p class="MsoNormal"><span lang="EN-GB">Gas: Propane @ 1.5 bar (apparently not of particularly good quality)</span></p><p class="MsoNormal"><span lang="EN-GB">Heating power: 250kW</span></p>
<p class="MsoNormal"><span lang="EN-GB">Usage: 230-300 litres of liquified propane gas /day</span></p><p class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal">
<span lang="EN-GB">The burner is used to heat water from around 70 degrees C to 95 degrees C in a boiler.</span></p><p class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal"><span lang="EN-GB">Does anyone know if such a replacement/modification is typically financially viable? Of course this depends on the rest of the system but I would be interested of hearing/reading about similar switch-overs in this ballpark that have been carried out before with financial success in the context of their own systems.</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal"><span lang="EN-GB">Many thanks for any help that could be offered.</span></p><p class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal">
<span lang="EN-GB">Best regards,</span></p><p class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal"><span lang="EN-GB">Edward</span></p><p class="MsoNormal"><span style="font-size: 10pt; color: black;" lang="EN-GB"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: black;" lang="EN-GB">_______________________________________<br>Edward Matos</span></p><p class="MsoNormal"><span style="font-size: 8pt; color: black;" lang="EN-GB">MEng (Hons.), AMIMechE, Hon.MSEE</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: black;" lang="EN-GB"><br>Mobile: +255(0) 686 128 037</span></p></div></div></div></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Alexander Eaton<br>Sistema Biobolsa<br>IRRI-Mexico<br>RedBioLAC<br><br>Mex cel: (55) 11522786<br>US cel: 970 275 4505<br><br><a href="mailto:alex@irrimexico.org" target="_blank">alex@irrimexico.org</a><br>
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