[Stoves] Thickness of flame front

[Michael Antal]

Although I always admire Tom’s postings, they occasionally contain
typographical errors.  We recover about 70% of the energy content of biomass
in the energy content of charcoal.  This is well documented in a long series
of papers.  Regards, Michael.

 

Michael J. Antal, Jr.

Coral Industries Distinguished Professor of Renewable Energy Resources

Hawaii Natural Energy Institute

POST 109, 1680 East-West Rd.

Honolulu, HI 96822

 

phone: 808/956-7267

fax: 808/956-2336

www.hnei.hawaii.edu

  _____  

From: Thomas Reed [mailto:tombreed at comcast.net] 
Sent: Tuesday, January 22, 2008 6:55 AM
To: Discussion of biomass cooking stoves; GASIFICATION; Michael Antal; Jim
Fournier; agua Das
Subject: Re: [Stoves] Thickness of flame front

 

Dear Andrew and All:

I was involved with diamond synthesis at Union Carbide and have converted a
few diamonds to graphite.  

At 1000 C diamonds are pretty stable in a hard vacuum or argon at 1 atm.  

At 1100C they begin to decompose slowly.

At 1200 C they pop like popcorn....

What a fascinating element.  And to think that the hydrogen people detest
it.  

Biocarbon or biocoal is carbon neutral and leaves the atmosphere as it is.
It can be called "Green Carbon" or "Green Coal".  So after we have stopped
our dependence on fossil fuels it will be the preferred energy form.  It is
a better way to convert biomass to energy which can then be stored, shipped
and burned carbon neutral.  

Mike Antal has developed a process that recovers > 30% or 40% of the energy
in biomass as biocoal with 12-13000 Btu/lb.  

Hydrogen is NOT neutral - it removes O2 from the atmosphere without
replacing it. 

Your biomass curmudgeon, 

TOM REED   
BEF
BEC
WoodGas.com





ÐÏࡱá



AJH wrote: 

On Fri, 18 Jan 2008 21:54:46 +0200, IPC wrote:
 
  

"Some carbon-carbon bonds are so strong the carbon won't burn, diamond
decomposes to graphite at 1200C but it doesn't burn."
 
Really?
    

 
I think so, as I said the diamond first graphitises and then further
heating will burn the graphite, I think this is how it was proved
diamonds were carbon in the 18th century but a solar concentrator had
to be used to get the temperature high enough.
 
 
  

 The only diamond I ever found was identified by a mineralogist.
When I doubted his identification, he said "Watch!", lit a bunsen burner,
put my stone on the end of a spatula and - Poof! 
    

 
I heard a similar story about a researcher at a university that was
"loaned" a diamond to do experiments on the vibrations of the bonds.
To excite the diamond he placed it on a stainless steel ultrasonic
transducer and proceeded to heat it up, being careful to keep below
the transition temperature, it too disappeared and the physics
department had to explain to De Beers how their diamond was now a
small piece of cast iron (or more correctly cementite) in the middle
of a stainless steel platter, search on cast iron eutectic mixture.
 
 
  

Don't leave your wife's jewels around in a fire.
    

 
And this story featured in a novel about a girl casting her diamond
engagement ring into the coal fire, regretting it but only finding a
blob of gold in the ashes next morning, a young lecturer wanted to
test this but De Beers wouldn't co operate!
 
IIRC diamond auto ignition point in pure oxygen is ~700C and someone I
trust implicitly has told me he has preheated a diamond to ~400C and
burned it by dropping it in liquid oxygen, he, like Tom Miles, has
money to burn ;-).
 
AJH
 
 
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