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<body class='hmmessage'><div dir='ltr'>Dean Still,<BR>According to Crispin and to our experience, the flames reaching the cooler pot, instantly create char or black carbon - insufficient combustion create more PM and black carbon........!?<BR> <BR>The fan driven Oorja, was tested here with woodpellets, four years ago.<BR>At full blast the "room" was soon covered in a thin layer of soot and ash.<BR>The cast iron combustion "chamber" was glowing instantly- around 1000 - 1100 C.<BR>What about ultra fine particles......?? <BR> <BR>Natural Draft gasifiers, are the way forward................<BR> <BR>We will soon test the Peko Pe with staw pellets and see the effects of clinker formation.<BR> <BR>Using Corn colbs (agri-waste) as fuel, we noticed a temperature of 450 - 550 C at the top of the flame and around 350 -400 C at the pyrolysis front.<BR>At the end of the burn, when most gases are utillized and the char starts glowing, we can raech the temperature arond 900 - 1000 C.<BR> <BR>To avoid clinker formation, we just removed the char , before it starts glowing, namely biochar.......problem solved?<BR> <BR>Otto<BR> <BR>Date: Sat, 17 May 2014 17:25:27 -0700<br>From: deankstill@gmail.com<br>To: stoves@lists.bioenergylists.org<br>Subject: Re: [Stoves] Clinker Formation<br><br><BR><div><div dir="ltr">Hi Tom,<div><br></div><div>Does cooling the burn reduce black carbon? Are ultra fine particles more of a problem in forced air stoves?</div><div><br></div><div>Best,</div><div><br></div><div>Dean</div></div>
<div class="ecxgmail_extra"><br><br><div class="ecxgmail_quote">On Sat, May 17, 2014 at 3:36 PM, Tom Miles Easystreet <span dir="ltr"><<a href="mailto:tmiles@trmiles.com" target="_blank">tmiles@trmiles.com</a>></span> wrote:<br>
<blockquote class="ecxgmail_quote" style="padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;"><div dir="auto"><div>Think of flue gas recirculation as a way of trimming excess air at the same burn rate while cooling the flame. The Kob boiler is nicely rigged for it. </div>
<div><br></div><div>Tom</div><div><br>T R Miles Technical Consultants Inc. <span></span><div><span><a href="mailto:tmiles@trmiles.com" target="_blank">tmiles@trmiles.com</a></span></div><div><span>Sent from mobile. </span></div>
</div><div><br>On May 17, 2014, at 9:00 AM, Crispin Pemberton-Pigott <<a href="mailto:crispinpigott@outlook.com" target="_blank">crispinpigott@outlook.com</a>> wrote:<br><br></div><blockquote><div><div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri,"Slate Pro",sans-serif; background-color: rgb(255, 255, 255);'>
How is it used to lower the temperature? By interfering with the O2 supply thus reducing the burn rate? Or the efficiency of combustion? </div> <div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri,"Slate Pro",sans-serif; background-color: rgb(255, 255, 255);'>
<br></div> <div style='color: rgb(31, 73, 125); font-family: Calibri,"Slate Pro",sans-serif; background-color: rgb(255, 255, 255);'>
Thanks </div><div style='color: rgb(31, 73, 125); font-family: Calibri,"Slate Pro",sans-serif; background-color: rgb(255, 255, 255);'>Crispin </div><div><div>
On Fri, 16 May 2014 07:59:49 -0700,"Tom Miles" <<a href="mailto:tmiles@trmiles.com" target="_blank">tmiles@trmiles.com</a>><br>
wrote:<br>
<br>
><br>
>Stages combustion in a pellet burner can be a challenge. Most pellet burners are designed to burn the fuel and air mixture at the highest temperature which is usually in the range of 1000C- 1100C range which will melt most dirty fuels. <br>
<br>
<br>
Does anyone use exhaust gas re circulation to lower the bed<br>
temperature burning pellets?<br>
<br>
We had this on the Kob boilers which burned shredded furniture waste,<br>
but generally did not need it with G30 woodchip on the adjacent<br>
boiler.<br>
<br>
AJH<br>
<br>
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