[Gasification] PYROLISIS OF BIOMASS
David Murphy
djfmurphy at dodo.com.au
Fri Dec 6 16:29:18 CST 2013
Well put Kevin ! We seem to be on the same page.
David Murphy.
On 07/12/2013 9:12 AM, Kevin C wrote:
> Dear Manuel
>
> Quoting MANUEL BARBA <manuelbarba1952 at hotmail.com>:
>
>> SIRS
>> 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 external heating.
>> *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 growth.
>
> # 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.
>
> Best wishes,
>
> Kevin
>
>
>> THANKS
>>
>
>
>
>
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