[Stoves] Insulation and stove life

[Ron]

Paal. Cc list

 1.  I don't recall seeing the word "horizontal" with Peko Pe before.  Can you explain or point me to a site?

  2.  I agree about the temperatures needed for various cooking tasks.  How are you accomplishing this wide range with the Peko Pe?

Ron


On Jun 9, 2013, at 9:58 AM, "Paal Wendelbo" <paaw at online.no> wrote:

> Stovers
> Crispin is right, the best insulation is air, and arranged the right way it will give some preheating to the intake off secondary air at the same time as it will prevent destroying the metal. By natural draft you will have a yellow charcoal with a temperature of about 900˚C and by forced air you will have white charcoal of a temperature of about 1000 ˚C, the temperature blacksmiths need for forcing and welding steel.
> But what is convenient temperature for cooking? It is definitely not 1000 ˚C. On top of charcoal it can sometimes be too hot, on open fire from wood sometimes too low. I have found that my horizontal TLUD ND PP stove works best with a temperature about 700 ˚C for cooking, about 450 ˚C for simmering and around 200 ˚C for baking bread. And to obtain that, I need no insulation anywhere in the stove.
> Regards Paal W
> 
> -----Opprinnelig melding----- From: ajheggie at gmail.com
> Sent: Sunday, June 09, 2013 2:26 PM
> To: Discussion of biomass cooking stoves
> Subject: Re: [Stoves] Insulation and stove life
> 
> [Default] On Sat, 8 Jun 2013 14:10:58 -0700,Bob Tingleff
> <bob at tingleff.com> wrote:
> 
>> Belonio's TLUD design calls for an insulated gasifier reactor, with the
>> inner cylinder being 20 gauge stainless, though Paul O's version is not
>> insulated. And Rocket stoves are insulated.  So I'm surprised to see the
>> comments below pass without any discussion. I wonder if Belonio's rice husk
>> gasifier stoves have longevity problems.
> 
> Insulation is necessary to reduce heat loss, so we are not saying don
> not use insulation. What we are saying is if the insulation is added
> to the "cool" side of a metal surface in the stove then it can cause
> the metal work to get to a temperature at which it fails, normally by
> oxidation.
> 
> On our high pressure pyrolysis unit we had blocks of ceramic
> insulation inside a steel containment but it was necessary to allow
> for cooling of the outer skin because stray hot gas could get past the
> insulation joints to heat the steel.
> 
> Steel seems to survive the temperature in a TLUD quite well, but this
> is only a temperature of around 600C. If the TLUD pyrolysis front
> reaches the primary air inlet and the char starts burning in updraught
> mode the temperature rapidly reaches over 1100C and steel fails
> quickly.
> 
> AJH
> 
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