Computational
Fluid
Dynamics
coupled
with
Discrete
Element
Method
(CFD-DEM)
has
been
extensively
utilized
for
studying
hydrodynamics
and
heat
transfer
in
fluidization
processes.
This
study
specifically
focuses
on
improving
a
biomass
fluidized
bed
combustor
immersed
tubes.
The
investigation
involves
the
use
of
mixed
biomass,
exploring
effects
types,
loading,
blending
ratios
to
propose
criteria
selecting
suitable
fuel
system.
Design
parameters
related
tubes,
such
as
angle
between
tube
diameters,
distance
were
also
considered.
A
data-driven
model
was
developed
based
CFD-DEM
results
predict
system
parameters.
offers
potential
applications
real-time
practical
engineering
without
need
simulation.
cylindrical
spherical
silica
sand
particles,
incorporating
an
appropriate
drag
force
model.
showed
that
ratio
1:3
wood
chips
coarse
bagasse,
5%
loading
using
average
equivalent
diameter
biomasses
4.44,
identified
conditions
general
case
obtain
most
efficient
hydrodynamic
this
study.
are
greater
than
sand.
Additionally,
proportion
should
be
less
bagasse.
Furthermore,
through
2k
factorial
design
analysis,
it
determined
tubes
had
significant
influence
behaviors.
Moreover,
development
Artificial
Neural
Network
(ANN)
models
successful
simulation
dataset,
enabling
accurate
predictions
mixing
index,
solid
volume
fraction,
temperature
within
enhances
understanding
systems
provides
valuable
insights
optimizing
operation
involving
Frontiers in Energy Research,
Год журнала:
2022,
Номер
10
Опубликована: Июнь 28, 2022
The
upstream
of
bioenergy
industry
has
suffered
from
unreliable
operations
granular
biomass
feedstocks
in
handling
equipment.
Computational
modeling,
including
continuum-mechanics
models
and
discrete-particle
models,
offers
insightful
understandings
predictive
capabilities
on
the
flow
milled
can
assist
equipment
design
optimization.
This
paper
presents
a
benchmark
study
fidelity
continuum
discrete
modeling
approaches
for
predicting
flow.
We
first
introduce
constitutive
law
model
contact
coarse-grained
model,
with
parameters
calibrated
against
laboratory
characterization
tests
loblolly
pine.
Three
classical
material
systems
(i.e.,
lab-scale
rotating
drum,
pilot-scale
hopper,
full-scale
inclined
plane)
are
then
simulated
using
two
same
initial
boundary
conditions
as
physical
experiments.
close
agreement
numerical
predictions
experimental
measurements
hopper
mass
rate,
critical
outlet
width,
stopping
thickness
plane,
dynamic
angle
repose,
clearly
indicates
that
methods
capture
behavior
biomass.
qualitative
comparison
shows
outperforms
parameterization
materials
wall
friction,
large-scale
systems,
while
is
more
preferred
discontinuous
at
smaller
scales.
Industry
stakeholders
use
these
findings
guidance
choosing
appropriate
tools
to
part
optimization
biorefineries.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2022,
Номер
10(50), С. 16803 - 16813
Опубликована: Дек. 5, 2022
The
bioenergy
industry
has
been
challenged
by
unstable
flow
and
transport
of
milled
biomass
in
material
handling
operations.
Handling
issues
such
as
hopper
clogging
auger
jamming
are
attributed
to
knowledge
gaps
between
existing
units
designed
for
bulk
solids
their
suitability
with
high
compressibility.
This
work
investigates
various
behaviors
granular
woody
wedge-shaped
hoppers.
Hopper
physical
experiments
numerical
simulations
conducted
study
the
influence
critical
attributes
processing
parameters
on
pattern,
arching,
throughput.
results
show
that
(1)
preferred
mass
flow,
can
be
achieved
controlling
material's
internal
friction
angle,
inclination,
wall
friction;
(2)
governed
competing
gravity-driven
force
against
resistance
from
material–wall
friction,
controlled
angle
inclination
angle;
(3)
throughput
accurately
estimated
our
empirical
equation
inputs
outlet
geometry
particle-scale
bulk-scale
attributes.
elucidates
physics
provides
guidance
industrial
equipment
design.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2021,
Номер
9(45), С. 15303 - 15314
Опубликована: Окт. 27, 2021
Poor
understanding
of
the
flow
behavior
granular
biomass
material
poses
great
challenges
for
bioenergy
industry,
as
equipment
functioning
time
is
significantly
reduced
by
handling
issues
like
screw
feeder
clogging
and
hopper
arching.
In
this
work,
loblolly
pine
chips,
including
mass
rate
critical
outlet
width,
in
a
wedge-shaped
investigated
combining
physical
experiments
numerical
simulations.
Comprehensive
characterization
response
affected
two
attributes
(initial
packing,
particle
density)
three
operational
parameters
(hopper
inclination,
surcharge)
conducted.
The
results
show
that
width
linearly
controls
rate,
while
inclination
angle
size.
packing
determines
whether
smooth
or
surging,
surcharge-induced
compaction
creates
impedance.
magnitude
these
influences
varies
from
slender
with
low
to
flat-bottom
silo.
These
findings
provide
guidance
operation
industry
shed
light
on
construction
novel
design
method
biorefineries.
IOP Conference Series Earth and Environmental Science,
Год журнала:
2024,
Номер
1330(1), С. 012044 - 012044
Опубликована: Май 1, 2024
Abstract
Biofuels
from
biomass
and
non-recyclable
municipal
solid
waste
(N-MSW)
can
potentially
replace
aviation
fossil
fuels.
However,
the
cost-effectiveness
is
impeded
by
feedstock
handling
issues,
such
as
unstable
flow
or
jamming
in
hoppers
feeders.
This
issue
be
solved
mainly
based
on
enhanced
understanding
of
rheology
N-MSW
particles,
which
remains
poorly
understood.
Leveraging
discrete
continuum-based
granular
models,
this
study,
we
conduct
industry-scale
hopper
testing
milled
woody
biomass,
paper,
cardboard,
foam,
thin
film,
plastic
investigate
potential
using
fluid
models
to
characterize
behavior.
The
tests
demonstrate
different
behaviors
tested
materials,
including
fast
flow,
stable-to-unstable
varying
rates.
Numerical
simulation
utilizing
Gudehus-Bauer
hypoplastic
model
demonstrates
good
agreement
with
experimental
data
for
rigid
those
non-Newtonian
exhibit
promising
low
computational
cost.
new
rheological
are
required
capture
rate
flows
highly
compressible
particles
paper
foam.
study
advances
knowledge
particulate
materials
biofuel
production.
Materials,
Год журнала:
2021,
Номер
14(12), С. 3273 - 3273
Опубликована: Июнь 13, 2021
Wood
pellets
are
an
important
source
of
renewable
energy.
Their
mechanical
strength
is
a
crucial
property.
In
this
study,
the
tensile
made
from
oak,
pine,
and
birch
sawdust
with
moisture
contents
8%
20%
compacted
at
60
120
MPa
was
determined
in
diametral
compression
test.
The
highest
noted
for
oak
lowest
pellets.
For
all
materials,
content
MPa.
All
exhibited
ductile
breakage
mode
characterised
by
smooth
round
stress–deformation
relationship
without
any
sudden
drops.
Discrete
element
method
(DEM)
simulations
were
performed
to
check
possibility
numerical
reproduction
pelletisation
then
pellet
deformation
process
successfully
simulated
using
DEM
implemented
bonded
particle
model.
reproduced
results
laboratory
testing
well
provided
deeper
insight
into
particle–particle
bonding
mechanisms.
Cracks
initiated
close
centre
and,
as
progressed,
they
further
developed
direction
loading.
International Journal of Food Properties,
Год журнала:
2024,
Номер
27(1), С. 1 - 18
Опубликована: Июль 18, 2024
In
this
study,
the
discrete
element
model
of
YCJ
particles
was
established
using
reverse
engineering
reconstruction
technology
and
EDEM
software,
physical
virtual
simulation
experiments
were
conducted
to
calibrate
contact
parameters.
addition,
intrinsic
parameters
during
brittle
ripening
period
measured
directly.
The
heap
angle
obtained
through
stacking
box
extraction
method,
MATLAB
Origin
utilized
obtain
angle.
Factors
their
ranges
significantly
affecting
selected
Plackett-Burman
steepest
ascent
as
evaluation
index.
17.45°.
optimal
combination
static
dynamic
friction
coefficients
between
determined
be
0.395
0.446
variance
analysis
optimization
calculations
response
surface
experiment.
Using
parameter
for
simulated
experiments,
a
17.3°
measured,
with
an
error
0.86%
compared
results
grading
validated,
accuracy
under
same
operating
conditions
3.28%,
particle
motion
state
being
basically
consistent
in
experiments.
research
indicate
that
calibrated
are
reliable,
providing
reference
calibration
fresh-eating
jujubes.
