The
fast
pyrolysis
of
spruce
(Picea
abies),
short
rotation
willow
coppice
(Salix
alba),
Miscanthus
(Mis-
canthus
x
giganteus),
and
wheat
straw
(Triticum
aestivum)
was
compared
on
a
laboratory
scale
bubbling
fluidized
bed
reactor
at
460–475
◦
C.
The
presence
of
ash,
ranging
from
0.26
wt.%
for
spruce
to
3.76
wt.%
for
wheat
straw
(moisture
free
basis)
favoured
decomposition
of
cell-wall
constituents
to
char
(spruce
[11.4
wt.%]
<
Salix
[16.2
wt.%]
<
Miscanthus
[21.8
wt.%]
<
wheat
straw
[21.5
wt.%])
with
a
reduction
of
liquid
organic
product
(spruce
[53.8
wt.%]
>
Salix
[45.4
wt.%]
>
Miscanthus
[37.3
wt.%]
>
wheat
straw
[37.2
wt.%]).
Bio-oils
from
Miscanthus
and
wheat
straw
were
inhomogeneous.
Differences
between
absolute
masses
of
compounds
determined
by
GC/MS-FID
of
the
bio-oils
compared
with
Py-GC/MS-FID
suggested
a
greater
role
of
secondary
reactions
at
the
fluidised
bed
scale,
with
reduced
concentrations
of
certain
lignin-derived,
furan
and
pyran
compounds.
The fast pyrolysis of spruce (Picea abies), short rotation willow coppice (Salix alba), Miscanthus (Mis- canthus x giganteus), and wheat straw (Triticum aestivum) was compared on a laboratory scale bubbling fluidized bed reactor at 460–475 ◦ C. The presence of ash, ranging from 0.26 wt.% for spruce to 3.76 wt.% for wheat straw (moisture free basis) favoured decomposition of cell-wall constituents to char (spruce [11.4 wt.%] < Salix [16.2 wt.%] < Miscanthus [21.8 wt.%] < wheat straw [21.5 wt.%]) with a reduction of liquid organic product (spruce [53.8 wt.%] > Salix [45.4 wt.%] > Miscanthus [37.3 wt.%] > wheat straw [37.2 wt.%]). Bio-oils from Miscanthus and wheat straw were inhomogeneous. Differences between absolute masses of compounds determined by GC/MS-FID of the bio-oils compared with Py-GC/MS-FID suggested a greater role of secondary reactions at the fluidised bed scale, with reduced concentrations of certain lignin-derived, furan and pyran compounds.
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