[Gasification] PYROLISIS OF BIOMASS

[David Murphy]

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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