[Stoves] Clinker Formation

[Otto Formo]

Dean Still,
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........!?
 
The fan driven Oorja, was tested here with woodpellets, four years ago.
At full blast the "room" was soon covered in a thin layer of soot and ash.
The cast iron combustion "chamber" was glowing instantly- around 1000 - 1100 C.
What about ultra fine particles......?? 
 
Natural Draft gasifiers, are the way forward................
 
We will soon test the Peko Pe with staw pellets and see the effects of clinker formation.
 
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.
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.
 
To avoid clinker formation, we just removed the char , before it starts glowing, namely biochar.......problem solved?
 
Otto
 
Date: Sat, 17 May 2014 17:25:27 -0700
From: deankstill at gmail.com
To: stoves at lists.bioenergylists.org
Subject: Re: [Stoves] Clinker Formation


Hi Tom,
Does cooling the burn reduce black carbon? Are ultra fine particles more of a problem in forced air stoves?
Best,
Dean


On Sat, May 17, 2014 at 3:36 PM, Tom Miles Easystreet <tmiles at trmiles.com> wrote:

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. 

Tom
T R Miles Technical Consultants Inc. tmiles at trmiles.comSent from mobile. 

On May 17, 2014, at 9:00 AM, Crispin Pemberton-Pigott <crispinpigott at outlook.com> wrote:


How is it used to lower the temperature? By interfering with the O2 supply thus reducing the burn rate? Or the efficiency of combustion?                                                                                                                                      

                                                                                                                                     
Thanks Crispin 
 On Fri, 16 May 2014 07:59:49 -0700,"Tom Miles" <tmiles at trmiles.com>

wrote:



>

>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. 






Does anyone use exhaust gas re circulation to lower the bed

temperature burning pellets?



We had this on the Kob boilers which burned shredded furniture waste,

but generally did not need it with G30 woodchip on the adjacent

boiler.



AJH



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