Modern industrial bioenergy systems involve pyrolysis and gasification, the heating of a
biomass feedstock under controlled conditions to produce combustible synthesis gas
(‘syngas’), and oil (‘bio-oil’) that can be burnt to produce heat, power, or combined heat and
power. Biochar, the third combustible product produced in pyrolysis, is the solid charred and
carbon-rich residue.
The balance in energy release and biochar formation can be optimised. Effectively, it is a
‘combustion’ process that may be curtailed at a point where any desired ratio in these
products has been achieved. This ratio can then be adjusted and re-optimised to satisfy
changing objectives. Whereas simple combustion of a feedstock maximises energy yield per
unit mass, combusting syngas from pyrolysis gives – where optimised for biochar – a much
greater energy yield per unit of carbon release.
Modern industrial bioenergy systems involve pyrolysis and gasification, the heating of a
biomass feedstock under controlled conditions to produce combustible synthesis gas
(‘syngas’), and oil (‘bio-oil’) that can be burnt to produce heat, power, or combined heat and
power. Biochar, the third combustible product produced in pyrolysis, is the solid charred and
carbon-rich residue.
The balance in energy release and biochar formation can be optimised. Effectively, it is a
‘combustion’ process that may be curtailed at a point where any desired ratio in these
products has been achieved. This ratio can then be adjusted and re-optimised to satisfy
changing objectives. Whereas simple combustion of a feedstock maximises energy yield per
unit mass, combusting syngas from pyrolysis gives – where optimised for biochar – a much
greater energy yield per unit of carbon release.
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