[Stoves] Magh Smoke Burner Stove

[Thomas Reed]

Dear Crispin and all:

The question of stainless steel vs mild steel (and tincanium) revolves 
on your use of the charcoal. 

Charcoal requires ~six times as much air to gasify as biomass, but if 
you supply it it makes a very beautiful blue flame.  However, it also 
gasifies  at >1000C, so tincanium doesn't last very long.  You could 
possibly put water into the incoming air (while cooling the fan?) and 
reduce this high temperature.  BUrning the charcoal this requires more 
stove control, but extends (doubles?) the cooking time. 

So, if you are willing to use only the volatiles and use the charcoal 
for terra pretta (or mix it back in with the next batch of wood), you 
can avoid stainless. 

Incidentally, our new model WoodGas stove (at www.woodgas.com) has a 
stainless steel "firetube". 

Onward to a billion stoves,

TOM REED                                       BEF
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nari phaltan wrote:
> Dear Dr. Reddy,
>
> Your stove looks very good. However how long will your stove material last?
> Is it made of stainless steel or mild steel? I think at these high
> temperatures the corrosion of material is very rapid.
>
> Cheers. Anil
>
>
> On 4/8/07, Crispin Pemberton-Pigott <crispinpigott at gmail.com> wrote:
>   
>> Dear Dr N
>>
>> Thanks for posting those excellent pictures.
>>
>> I have a suggestion that might limit the flame height a little which will
>> probably lower the CO production a little.
>>
>> Take a steel pin the same size as the drill that made the holes at the top
>> and insert it into the hole from the outside of the cylinder, and lift
>> hard,
>> creating a protruding lip that angles the air blast downwards
>> slightly.  The
>> pin will dent the lower side of the hole outward and the top inward toward
>> the centre.  This will cause the air blast to blow down toward the centre
>> and do the mixing at a lower level, nearer the fuel.
>>
>> If you were to simultaneously angle it slightly to the side, you could
>> also
>> get a rotation going which will increase the flame path length inside the
>> cylinder and reduce it outside, again reducing CO production and probably
>> increasing the heat transfer efficiency.  Ideally no flame will exit the
>> top
>> of the stove.
>>
>> If you are able to, don't drill a hole at all, but make a small horizontal
>> cut then force in the pin.  This will give the hole a more effective
>> air-directing capability.
>>
>> Nice stove!
>> Crispin
>>
>>
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>>     
>
>
>
>