<div dir="ltr"><div>I like this design Chris. A very simple afterburner could be constructed as follows at no / little cost.</div><div><br></div><div>Find a small steel barrel ( 30 gallon ) and cut out both ends so you have a hollow tube. For a larger kiln like that shown in the video, it might be better to have 2 cut out barrels and tack weld them together to form a longer hollow tube to contain the flare.<br></div><div><br></div><div>The holes where the stovepipes exit will need to be closed/eliminated. Instead, place the barrel between where the stovepipes were so that the edge of the barrel is perhaps 20-30 cm in from the edge of the box. Find the center point of the barrel circumference with the barrel in position on top of the box and put a mark there.</div><div><br></div><div>If you seal the bottom edge of the box-kiln with soil, you might be able to get away with a single 10mm hole to allow the gases to escape. If not, you'll need a larger hole, or a straight line of 10 mm holes, enough so that the gases escape out the hole(s) rather than being pushed out from underneath the box-kiln edge. (In a 200 liter barrel kiln, a single 8mm hole is plenty. The gases come out under some pressure, but that helps to mix air with the gas stream.)<br></div><div><br></div><div>Find 2 pieces of firebrick. You'll place them either side of the hole(s). Make some legs for your afterburner, perhaps a tripod modeled after the <i>Spacex</i> landing legs on the booster, so that there is about a 10 cm gap between the bottom of the barrel and the top of the box-kiln. That gap will allow air into your afterburner. <br></div><div><br></div><div>Set the firebrick and afterburner barrel aside. Load and start the batch on fire. When the lid is closed, place the firebricks on either side of the hole(s) leaving the same gap as the diameter of the hole(s), so the wood gas contacts the firebrick on the way out. Place the <i>Spacex Afterburner</i> centered over the holes and firebrick. Then with some kindling, start a little fire on top of the kiln box next to the afterburner. Add some long sticks so the ends are in the fire. Then gently push the fire to the edge of the afterburner with one of the long sticks, and then a bit under. It might take a bit of fiddling, but the gases will ignite, and the exhaust will be clean. Take one of the sticks that has an ember on it, before your fire under the afterburner goes out, and place it where the gas is exiting the kiln, on top of the firebrick. The gas flow will keep the ember glowing and the ember will keep the gas flame lit. <br><br></div><div>Once the afterburner has been burning for a while, perhaps 20-30 minutes or so, the firebrick should keep the flame lit without an ember at the end of a stick. A stainless steel wire mesh, or just stainless wire bunched up in a tangle, suspended or jammed in the barrel over where the gas exits, will also help to maintain the flame.<br></div><div><br></div><div>While the above approach fits with the simple DIY character of the kiln, a more sophisticated afterburner is certainly possible. <br></div><div><br></div><div><img src="cid:ii_kj3flvb30" alt="afterburner7.jpg" width="427" height="570"></div><div><br></div><div>See the stick? The ember at the end is helping to maintain the flare. In the beginning of a batch, the wood gas will have some moisture content, so the flare tends to go out without support of some kind.<br></div><div><br></div><div><img src="cid:ii_kj3fm6p31" alt="afterburner8.jpg" width="427" height="570"></div><div><br></div><div>I used a stovepipe here, but it's not really necessary. It's more difficult to weld, and it's going to fail where it's getting red hot. So I think using 2 connected barrels is better.<br></div><div><br></div><div><img src="cid:ii_kj3fmfyn2" alt="afterburner9.jpg" width="427" height="570"><br><br></div><div>The flare here is being maintained by 2 firebricks positioned either side of the gas exit hole. Once the firebrick gets hot and the moisture is out of the wood gas, it worked well for me.</div><div><br></div><div><img src="cid:ii_kj3fzn4w3" alt="afterburner6.jpg" width="427" height="570"></div><div><br></div><div>Clean stack. <br></div><div><br></div><div><br></div><div>Use heavy leather welding gloves when placing and maintaining the afterburner. Avoid windy days. <br></div><div><br></div><div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><font size="1" color="#000000"><br></font><br><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Dec 23, 2020 at 8:20 PM Ron Larson <<a href="mailto:rongretlarson@comcast.net">rongretlarson@comcast.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;">Chris and ccs<div><br></div><div><span style="white-space:pre-wrap"> </span>Thanks for a good response.</div><div><br></div><div><span style="white-space:pre-wrap"> </span>We have to strongly argue against “smoldering” kilns for anything called biochar.</div><div><br></div><div><span style="white-space:pre-wrap"> </span>I endorse your request for funding to add the afterburner.</div><div><br></div><div>Ron</div><div><br></div><div><br><div><br><blockquote type="cite"><div>On Dec 22, 2020, at 11:54 PM, dr.adam <<a href="mailto:scda2@ymail.com" target="_blank">scda2@ymail.com</a>> wrote:</div><br><div><div><div style="font-family:times new roman,new york,times,serif;font-size:16px"><div><div dir="ltr">Dear All,</div><div dir="ltr">yes, its better not to use "smouldering kilns", but "retort kilns" instead. <br>However as long as ring kilns are used, the "box-kiln" might be a better alternative,</div><div dir="ltr"><div>because a "box kiln" can be easier fitted with some insulation (= better efficiency) and also they are more suitable to fit an "afterburner"?</div><div>I do not have an own workshop, i paid all expeneses from my private pocket to build this prototype.<br><div>So let see if we find some organization which funds the 2nd stage to modify and integrate an "afterburner" in it?</div><div dir="ltr"><font color="#5b8828"><b>Cheers</b></font></div><div dir="ltr"><font color="#5b8828"><b>Chris ADAM</b></font><br></div></div></div><div><br></div></div><div><br></div>
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On Wednesday, 23 December 2020, 01:43:17 CET, Ronal Larson <<a href="mailto:rongretlarson@comcast.net" target="_blank">rongretlarson@comcast.net</a>> wrote:
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<div><div id="gmail-m_2850038511645987375ydpcc0937c5yiv3024844387"><div><div><div><div>List , Frank, Chris, and other ccs</div><div><br></div><div><span style="white-space:pre-wrap"> </span>I take Frank’s message to contain a concern for the excessive smoke with Chris Adam’s kiln. I agree.</div><div><br></div><div><span style="white-space:pre-wrap"> </span>Chris - at 2:30 of your video on the box kiln, there is a note saying that one can add an after-burner. If, you’ve done that - can you send anything on the improvement?</div><div><br></div><div>Ron</div><div><br></div><div><br><div><br><blockquote type="cite"><div>On Dec 22, 2020, at 6:04 AM, Frank Strie <<a href="mailto:frank.strie@gmail.com" rel="noreferrer noopener" target="_blank">frank.strie@gmail.com</a>> wrote:</div><br><div><div style="font-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:currentcolor"><p style="line-height:16.8pt;background-color:white"><span style="font-size:14pt;font-family:Cambria,serif">Thanks for the link to the trading company Kobus Venter,<br>From your website I see that you also have invested many years of hard work and commitment.<br><br>Interesting images on this book cover :</span><span><br><a href="https://woodsmithexperience.co.uk/product/making-charcoal-and-biochar-a-comprehensive-guide" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">https://woodsmithexperience.co.uk/product/making-charcoal-and-biochar-a-comprehensive-guide</a><span> </span></span><span style="font-size:14pt;font-family:Cambria,serif"><br></span><span style="font-size:12pt;font-family:Sans sans-serif;color:rgb(66,66,66)">…”There are chapters on the heritage skills of earth burns, the enduring popularity of metal kilns and the future represented by the charcoal retort.</span></p><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;line-height:16.8pt;background-color:white"><b><span style="font-size:12pt;font-family:Sans sans-serif;color:rgb(66,66,66)">Biochar</span></b><span style="font-size:12pt;font-family:Sans sans-serif;color:rgb(66,66,66)"><span> </span>– or<span> </span><b>small particle charcoal</b><span> </span>– is heralded as an ancient but rediscovered ‘super substance’. It can increase soil fertility and productivity whilst locking up carbon into the ground. This book looks at the ongoing discussion and weighs up the evidence.”…<br></span><span style="font-size:14pt;font-family:Cambria,serif"><br>From my personal and practical experience over the past 13+ years on this topic, the big difference between the classic charcoal ring kilns with lid, air inlets and 4 to 6 pipe chimneys (I have a big one, but it became obsolete for us some six and a half years ago), is the air pollution / smoke emissions, condensations and lower carbonisation temperature.<br>When I compare this old fashioned smothered, “smouldering burn” with the optimal open burn, in deep cones & ring kilns without lid and without condensation we get very different results.<br>When it comes to Biochar for soil improvement, quenching with nutrient rich liquid (if available) or water will result in very different products to snuffing the char dry.<br>The particulates from black carbon / dust is another reason why I would not suggest to hold on to this practice.<span> </span><br>Producing dry charcoal for fuel (carbon oxidisation) as the main / primary product objective is therefore fundamentally different to the intentional production of high quality, fit for soil medium purpose, soil conditioners and nutrient enriched Biochar.<br>The debate and the action continue, and that’s just fine …<span> </span><br><i> Frank</i><span> </span>again </span><span> </span><span style="font-size:12pt;font-family:Sans sans-serif;color:rgb(66,66,66)"></span></div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span> </span></div><div style="border-style:solid none none;border-top-width:1pt;border-top-color:rgb(225,225,225);padding:3pt 0in 0in"><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><b><span lang="EN-US">From:</span></b><span lang="EN-US"><span> </span><a href="mailto:main@Biochar.groups.io" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">main@Biochar.groups.io</a><span> </span><<a href="mailto:main@Biochar.groups.io" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">main@Biochar.groups.io</a>><span> </span><b>On Behalf Of<span> </span></b>Kobus Venter<br><b>Sent:</b><span> </span>Tuesday, December 22, 2020 9:06 PM<br><b>To:</b><span> </span><a href="mailto:main@biochar.groups.io" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">main@biochar.groups.io</a><br><b>Subject:</b><span> </span>Re: [Biochar] Box-Kiln for improved charcoal production, Adam 21.12.020 Youtube</span></div></div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"> </div><div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt;font-family:New serif;color:rgb(12,52,61)">Flattered that my company VUTHISA is being mentioned in the video. Just have to point out that the small TPI metal kiln pictured is actually being sold by a UK company:<span> </span><a href="https://woodsmithexperience.co.uk/product-category/charcoal-kilns-equipment/page/2/" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">https://woodsmithexperience.co.uk/product-category/charcoal-kilns-equipment/page/2/</a></span></div></div><div id="gmail-m_2850038511645987375ydpcc0937c5yiv3024844387m_3324116165379348448DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt"> </span></div></div><div id="gmail-m_2850038511645987375ydpcc0937c5yiv3024844387m_3324116165379348448DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt;font-family:New serif;color:rgb(12,52,61)">Also note our kilns are now all being lined with various types of insulation so we don't advocate using a system where any part of the flame interacts with a metal surface similar to this pizza oven: <a href="https://vuthisa.files.wordpress.com/2020/12/20201130_131434.jpg" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">https://vuthisa.files.wordpress.com/2020/12/20201130_131434.jpg</a><span> </span>an example of a refractory cement cast in a mould. </span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt;font-family:New serif;color:rgb(12,52,61)"> </span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt;font-family:New serif;color:rgb(12,52,61)">I really love the ideas coming from Chris Adam - we often talk and exchange ideas - that's the way it should be. </span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt;font-family:New serif;color:rgb(12,52,61)"> </span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt;font-family:New serif;color:rgb(12,52,61)">Wbr</span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt;font-family:New serif;color:rgb(12,52,61)"> </span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:14pt;font-family:New serif;color:rgb(12,52,61)">Kobus</span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:18pt;font-family:New serif;color:rgb(12,52,61)"> </span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:18pt;font-family:New serif;color:rgb(12,52,61)"> </span></div></div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"> </div><table style="border-style:solid none none;border-top-width:1pt;border-top-color:rgb(211,212,222)" cellspacing="3" cellpadding="0" border="1"><tbody><tr><td style="width:41.25pt;border-color:currentcolor;border-style:none;border-width:medium;padding:9.75pt 0.75pt 0.75pt" width="55"><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank"><span style="text-decoration-line:none;text-decoration-style:solid;text-decoration-color:currentcolor"><img id="gmail-m_2850038511645987375ydpcc0937c5yiv3024844387_x0000_i1031" 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style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif">On Mon, Dec 21, 2020 at 6:49 PM Tom Miles <<a href="mailto:tmiles@trmiles.com" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">tmiles@trmiles.com</a>> wrote:</div></div><blockquote style="border-style:none none none solid;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in"><div><div><div><div><div><div><p style="margin:0in 0in 12pt;font-size:11pt;font-family:Calibri,sans-serif"><b><span lang="EN-US">From:</span></b><span lang="EN-US"><span> </span>dr.adam <<a href="mailto:scda2@ymail.com" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">scda2@ymail.com</a>><span> </span><br><b>Sent:</b><span> </span>Monday, December 21, 2020 3:51 AM</span></p><div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="font-size:12pt;font-family:New serif;color:rgb(91,136,40)" lang="EN-US">Box-Kiln for improved charcoal production, Adam 21.12.020 Youtube</span></b><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US"> </span><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US"><a href="https://www.youtube.com/watch?v=VRRNVc3zqAU&t=6s" style="color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor" rel="noreferrer noopener" target="_blank">https://www.youtube.com/watch?v=VRRNVc3zqAU&t=6s</a></span><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US"> </span><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US"> </span><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="font-size:12pt;font-family:New serif;color:rgb(91,136,40)" lang="EN-US">Dear All,</span></b><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US">i was uploading the video clip of the new "<b>box-kiln</b>" i developed lately.</span><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US">Give it a "like" and/or add some comment if you want,<span> </span></span><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="font-size:12pt;font-family:New serif;color:rgb(91,136,40)" lang="EN-US">Thanks</span></b><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="font-size:12pt;font-family:New serif;color:rgb(91,136,40)" lang="EN-US">Chris ADAM</span></b><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US">----------------------------</span><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US">Hallo,</span><span lang="EN-US"></span></div></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US">habe gerade den Youtube Clip zu meinem "Box-Kiln" (Kastenmeiler) auf Youtube gestellt,</span><span lang="EN-US"></span></div></div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US">gebt ein "like" dazu, vielleicht auch einen kurzen Kommentar wenn ihr wollt..</span><span lang="EN-US"></span></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US">Lieben Gruß</span><span lang="EN-US"></span></div></div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:New serif" lang="EN-US">Chris A.<span> </span></span><span lang="EN-US"></span></div></div></div></div></div></div></div></div></blockquote></div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><br clear="all"></div><div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"> </div></div><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif">--<span> </span></div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><p><span style="font-size:7.5pt;font-family:Helvetica,sans-serif"><img id="gmail-m_2850038511645987375ydpcc0937c5yiv3024844387_x0000_i1030" src="https://docs.google.com/uc?export=download&id=0B_3O4Usl1EhiS3RIcWNuNDFLS2c&revid=0B_3O4Usl1EhiMGI1VVI4aXBBbTNOZXBCN2NleWFTWjdIcGRvPQ" style="width: 600px; max-width: 0px;" border="0"></span><span style="font-size:7.5pt;font-family:Helvetica,sans-serif"></span></p><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"> </div><pre style="margin:0in;font-size:10pt"><br><br></pre></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><div id="gmail-m_2850038511645987375ydpcc0937c5yiv3024844387gmail-m_3324116165379348448DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"> </div><table style="border-style:solid none none;border-top-width:1pt;border-top-color:rgb(211,212,222)" cellspacing="3" cellpadding="0" border="1"><tbody><tr><td style="width:41.25pt;border-color:currentcolor;border-style:none;border-width:medium;padding:9.75pt 0.75pt 0.75pt" width="55"><div style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif"><a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" 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