[Gasification] Autopyrolysis Biochar - question on the wet newspaper

[rcwarship .]

Thanks for the prompt reply Tom, I appreciate it.  I'm getting ready to do
a batch this weekend & will be giving it a try!
Best Regards To All,
Jon


On Thu, Dec 26, 2013 at 9:46 AM, Thomas Reed <tombreed2010 at gmail.com> wrote:

> Jon and All
>
> I don't have any exact knowledge of the thickness of paper required to
> quench a pile  of Autochar, but  I think a saturated New York Times Sunday
> Edition should have enough water to put out any fire burning above it.
>
> After all, after the fire has passed through a layer, no more oxygen can
> reach it because the next layer gobbles up all the O2.  AND the upper
> layers are all cooling by BLACK BODY RADIATION, which increases as the
> fourth power of temperature even though they are still heated from below.
> <><><>
>
> The BB radiation is,according to the Stefan Boltzmann law,
>
> Stefan–Boltzmann lawThe Stefan–Boltzmann law<http://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_law>
>  states that the power emitted per unit area of the surface of a black
> body is directly proportional to the fourth power of its absolute
> temperature:[image: j^{\star} = \sigma T^4,]
>
> where *j**is the total power radiated per unit area, *T* is the absolute
> temperature <http://en.wikipedia.org/wiki/Absolute_temperature> and *σ*
>  = 5.67×10−8 W m−2 K−4 is the Stefan–Boltzmann constant<http://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_constant>
> .
> For us (Surviving) mortals, this says that a black body (like charcoal)
> emits 5.67 T^4 Watts/cm2
> but be sure to add 273 to the centigrade temperature, since T is the
> absolute temperature, in degrees Kelvin.
> For charcoal at 500 C it would be
>
> Radiated Power = 5.67X 10^-12x(500+273)^4 =  2.02 Watts/cm2
>
> Not a lot, but there are a lot of cm2!  , so don't stand too close.
>  (Assuming I calculated correctly.)(I divide the 773 by 1000, raise 0.773
> ^4 and multiply by 5.67, and avoid the 10^-12 this way. A square meter
> surface at this temperature would radiate 20 kW!  Toasty!
>
> In case you haven't guessed it, my degree is in Physical Chemistry, which
> deals  extensively and intensively in this stuff.
>
> Comments?
>
> Tom Reed
>
> (In case this were not a black body, it would have an emisivity in the SB
> equation, the power emitted by the body compared to that of a true black
> body.  Charcoal is the only substance which comes close to having an
> emisivity of 1.00. )
> Dr.  Thomas B Reed
> 280 Hardwick Rd
> Barre, Ma 01005
> 508-353-7841
>
> On Dec 24, 2013, at 5:59 PM, Jon <rcwarship at comcast.net> wrote:
>
> Heya Tom Reed,
> Thanks so much for the newspaper idea.  I'm using a toplit updraft (55
> gallon barrel), and was wondering how  much newspaper are we talking about?
>  I assume that it would be kept in sheet form & not balled up?
> Thanks in advance for the advice.
> Merry Christmas To All,
> Jon
>
>
> On 12/24/2013 2:02 PM, Tom Reed wrote:
>
> Toplit updraft
>
>
>
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