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Otto that straw pellet test will be important because it may have all its Cl and K in it so the melting temp will be lowered. </div>
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If processed agri-wastes are to be an important fuel they will have to be accommodated by the designer. </div>
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Regards </div>
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Crispin </div>
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BBM 2B567C3</div>
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<div><b>From: </b>Otto Formo</div>
<div><b>Sent: </b>Sunday, May 18, 2014 16:39</div>
<div><b>To: </b>Stoves Bioenergylist</div>
<div><b>Reply To: </b>Discussion of biomass cooking stoves</div>
<div><b>Subject: </b>Re: [Stoves] Clinker Formation</div>
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<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>
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<div>Best,</div>
<div><br>
</div>
<div>Dean</div>
</div>
<div class="x_ecxgmail_extra"><br>
<br>
<div class="x_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>
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<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>
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<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>
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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>
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Thanks </div>
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Crispin </div>
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<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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