[Gasification] PYROLISIS OF BIOMASS
kchisholm at ca.inter.net
Fri Dec 6 16:12:23 CST 2013
Quoting MANUEL BARBA <manuelbarba1952 at hotmail.com>:
> MAY BE SOMEBODY MAY AWSWER FOLLOW QUESTIONS:
> 1.-ABOUT PYROLISIS OF BIOMASS,
# Lets assume that the charcoal is being made in a sealed Retort, with
> *TAR ARE SAME DEFINITION OF VOLATILE GAS WHEN BIOMASS IS USED LIKE FUEL
# The "Pyrolysis Gas" coming off the retort is actually a mixture of
solids (char particles and ash, liquid products (heavy and light tars,
methanol, water vapor, methanol vapor, etc), and non-condensible
gases, (CO, CO2, N, CH4)
> *CHAR IS THE SOLID WASTE AFTER PYROLISIS?
# The Char remaining after pyrolysis is a combination of pure
charcoal, residual high temperature chars that did not leave the
retort with the pyrolysis gases, and ash.
> *BIOCHAR ARE SOLID RESIDUES FROM PYROLISIS AND ARE SAME OF SOLID
> WASTE INCLUIDING ASH AND IT CAN BE USED AS A ORGANIC ENHANCE OF SOIL
> CALLED THE "TERRA PRETTA"
# The solids remaining after pyrolysis are generally termed
"charcoal." It has many uses, for example, as a fuel, for medicinal
purposes, for adsorption of gases and liquids, and for use as a "soil
improving agent." When such charcoal is sequestered, such as being
dumped down a mine shaft, or when mixed with the soil, the carbon
content is mostly removed from teh Biosphere, and the overal
consequence is that CO2 is removed from the atmosphere.
# When Charcoal is added to the soil for the purpose of improving
"soil function", it is being used as it was used to produce Terra
Preta soils, and it can be termed "Biochar". However, charcoal is NOT
Terra Preta... it is one ingredients of Terra Preta. Simply adding
only charcoal to a marginal soil probably will not result in an
"agricultural improvement", in that the charcoal will tend to hold on
to some of the available nutrients, making them unavailable for plant
# Note that teh ash components of Biochar can be very beneficial to
some soils, by raising the pH to a level appropriate for the crop
being grown. On teh other hand, "High Ash Biochars" could be harmful
to "good soils" if the pH is raised to an undesirable level.
On teh overall, Biochar additions can be beneficial, if they bring to
the soil a property that the soil requires.
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