the chemical decomposition of a condensed substance by heating,
largely in the absence of oxygen. It is commonly used for organic
materials. The process can be self-sustaining as the syngas produced
be produced by pyrolysis or gasification systems.
- Fast Pyrolysis
tends to produce more oils and liquids
- Slow Pyrolysis
tends to produce more Syngas and Biochar
of biochar a function of:
hemicellulose, lignin, & ash content
For a detailed
description of pyrolysis, refer to:
to our Disclaimer. Legislation, MSDS
sheets and other sources provide information on several topics including
the safe handling, proper disposal, and other risks associated with
biochar. The following illustrates a few selected cautions for users
of biochar, there are additional areas that users of biochar need
to be aware of:
and conversion of biomass into charcoal is a very hot process.
Gasification without complete combustion can occur at temperatures
of up to 1000 degrees C.
of biomass produces Carbon monoxide (CO), Hydrogen gas (H2) and
Methane (CH4). These
are all odorless, colourless, and very flammable gases.
- There is
also production of non-flammable gases including Carbon dioxide
(CO2), Water vapor- (H2O), and some amount of polycyclic aromatic
hydrocarbons (PAHs) - entrained liquid in the exiting gas flow,
and possibly also soot. ALL ARE EXTREMELY HOT when exiting the
pyrolysis reactor/gasifier. All surfaces of such reactors/kilns
are EXTREMELY HOT when operating.
- If fresh
charcoal, which has condensed volatile matter on it, is exposed
to oxygen and sufficient heat, it will re-ignite.
dust and soot can both cause severe respiratory distress.
- Smoke and
heat are dangerous. Do not breathe, stay back, and do not touch
with bare skin.
Canadian Biochar Initiative www.biochar.ca