Microalgae conversion through the pyrolysis pathway has two
energy intensive processes, microalgae drying and heating in the
pyrolysis rector which directly impact the environmental impact
of the pathway. The reactor energy is supplemented through burning
of pyrolysis byproducts, gas and char, which improves process
energetics but are detrimental to GHG emissions. If burning of
pyrolysis char is replaced with natural gas and the produced char
is assumed to be land applied, the GHGs for the production of biofuel
are reduced from 210 g CO2-eq MJ1 to 166 g CO2-eq MJ1, with
the NER increasing from 2.28 to 2.63. Using pyrolysis char for alternative
purposes would decrease the environmental impact of the
pyrolysis pathway, but GHG emissions are still significantly higher
than those of conventional diesel and soy biodiesel, and results in
an unfavorable increase in the NER. The need of a dry feedstock and
energy demands in the reactor for the pyrolysis unit make it difficult
to produce an energetically and environmentally favorable
renewable fuel from a microalgae feedstock. Emissions from microalgae
renewable diesel with pyrolysis are high in comparison
with conventional diesel and soybean biodiesel.
Microalgae conversion through the pyrolysis pathway has two
energy intensive processes, microalgae drying and heating in the
pyrolysis rector which directly impact the environmental impact
of the pathway. The reactor energy is supplemented through burning
of pyrolysis byproducts, gas and char, which improves process
energetics but are detrimental to GHG emissions. If burning of
pyrolysis char is replaced with natural gas and the produced char
is assumed to be land applied, the GHGs for the production of biofuel
are reduced from 210 g CO2-eq MJ1 to 166 g CO2-eq MJ1, with
the NER increasing from 2.28 to 2.63. Using pyrolysis char for alternative
purposes would decrease the environmental impact of the
pyrolysis pathway, but GHG emissions are still significantly higher
than those of conventional diesel and soy biodiesel, and results in
an unfavorable increase in the NER. The need of a dry feedstock and
energy demands in the reactor for the pyrolysis unit make it difficult
to produce an energetically and environmentally favorable
renewable fuel from a microalgae feedstock. Emissions from microalgae
renewable diesel with pyrolysis are high in comparison
with conventional diesel and soybean biodiesel.
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