International Journal of Hydrogen Energy,
Journal Year:
2023,
Volume and Issue:
49, P. 1303 - 1314
Published: Nov. 17, 2023
This
study
proposes
a
novel
micro-combustor
fueled
by
ammonia
and
oxygen,
employing
double-channel
inlet
outlet
(DIDO)
configuration
with
the
reverse
flow
structure.
The
investigation
delves
into
parameters
of
volumetric
rate
(Qv),
pressure
(Pin),
equivalence
ratio
(Φ),
baffle
length
(d)
on
both
nitrogen
oxide
emissions
thermal
performance
micro-combustor.
It
is
observed
that,
in
comparison
to
conventional
systems,
DIDO
combustor
capable
generating
vortex
at
outlet,
thereby
reducing
NOx
emissions.
Specifically,
Qv
900
mL/min,
NO
concentration
can
be
curtailed
29.23
%.
Furthermore,
exhibit
gradual
decline
increase
Φ
Pin.
Notably,
yields
substantial
enhancement
performance,
achieving
51
%
reduction
standard
deviation
outer
wall
temperature
(ST,W)
when
set
500
mL/min
which
significantly
enhances
uniformity
temperature.
peak
maximum
radiation
efficiency
(ηradiation)
reached
=
0.9.
analysis
entropy
production
indicates
that
it
increases
augmentation
Qv,
while
elongating
d
augments
exergy
(ηexergy).
Fuel,
Journal Year:
2023,
Volume and Issue:
360, P. 130269 - 130269
Published: Dec. 6, 2023
This
study
investigates
the
characteristics
of
a
compression
ignition
engine
fuelled
by
ammonia
and
diesel
in
high-pressure
dual
fuel
mode.
The
focuses
on
effect
injection
strategies
performance
important
emissions
like
NH3,
NO/NO2
N2O.
was
operated
with
fixed
intake
air
conditions
at
an
speed
1500
rpm
for
all
operating
points,
liquid
directly
injected
180
bar
using
GDI
injector.
energy
shares
tested
were
40
%,
50
%
60
%.
Various
combustion
modes
achieved
fixing
timing
−15
CAD
aTDC
varying
between
-80
2.5
aTDC.
Injecting
early
(-80/-60
aTDC)
led
to
premixed-type
very
high
slip
(65
%).
Delaying
-30
aTDC,
i.e.
15
before
injection,
yielded
long
delay
due
strong
influence
resulting
premixed
diesel.
simultaneously
or
after
did
not
affect
ignition,
yielding
stable
where
burned
during
mixing-controlled
phase.
Temporally
overlapping
injections
resulted
highest
efficiency,
lowest
slip,
NOx
emissions,
N2O
i.e.,
optimal
cases
found.
For
temporally
injections,
extending
end
found
increase
compared
injecting
diesel,
limited
time
vaporise,
mix
combust
expansion
stroke.
have
opposite
trends,
concentrations
points
efficiency.
phasing
improved
efficiency
share
cases,
while
it
deteriorated,
which
can
be
explained
cases.
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(28), P. 8502 - 8509
Published: July 1, 2024
N2O
is
a
dominant
atmosphere
pollutant,
causing
ozone
depletion
and
global
warming.
Currently,
electrochemical
reduction
of
has
gained
increasing
attention
to
remove
N2O,
but
its
product
worthless
N2.
Here,
we
propose
direct
eight-electron
(8e)
pathway
electrochemically
convert
into
NH3.
As
proof
concept,
using
density
functional
theory
calculation,
an
Fe2
double-atom
catalyst
(DAC)
anchored
by
N-doped
porous
graphene
(Fe2@NG)
was
screened
out
be
the
most
active
selective
for
electroreduction
toward
NH3
via
novel
8e
pathway,
which
benefits
from
unique
bent
adsorption
configuration.
Guided
theoretical
prediction,
Fe2@NG
DAC
fabricated
experimentally,
it
can
achieve
high
N2O-to-NH3
Faradaic
efficiency
77.8%
with
large
yield
rate
2.9
mg
h–1
cm–2
at
−0.6
V
vs
RHE
in
neutral
electrolyte.
Our
study
offers
feasible
strategy
synthesize
pollutant
simultaneous
removal.
Carbon Neutrality,
Journal Year:
2024,
Volume and Issue:
3(1)
Published: May 2, 2024
Abstract
Ammonia
is
emerging
as
a
viable
alternative
to
fossil
fuels
in
combustion
systems,
aiding
the
reduction
of
carbon
emissions.
However,
its
use
faces
challenges,
including
NOx
emissions
and
low
flame
speed.
Innovative
approaches
technologies
have
significantly
advanced
development
implementation
ammonia
zero-carbon
fuel.
This
review
explores
current
advancements
using
fuel
substitute,
highlighting
complexities
that
various
systems
need
overcome
before
reaching
full
commercial
maturity
support
practical
decarbonising
global
strategies.
Different
from
other
reviews,
this
article
incorporates
insights
industrial
partners
currently
working
towards
green
technologies.
The
work
further
addresses
fundamental
combustion,
crucial
for
types
equipment.
Applied Thermal Engineering,
Journal Year:
2023,
Volume and Issue:
233, P. 121180 - 121180
Published: July 20, 2023
The
present
study
proposes
a
reverse
flow
single-channel
inlet
and
double-channel
outlet
(SIDO)
micro-combustor
for
the
analysis
of
thermal
performance
nitrogen
oxide
emission
characteristics
ammonia/hydrogen-fuelled
energy
conversion
system.
Comparison
is
then
made
between
proposed
system
conventional
single-inlet
single-outlet
findings
indicate
that
SIDO
combustor
enhanced
performances.
Increasing
pressure
Pin
improves
exergy
efficiency
while
reducing
emissions.
velocity
Vin
can
enhance
temperature
uniformity
wall.
It
also
found
ammonia
combustion
convection
heat
transfer
optimized,
when
=
1.25
m/s.
equivalence
ratio
Φ
leads
to
reduction
emissions,
has
better
overall
performance,
1.0.
Finally,
blending
ration
hydrogen
with
Φb
give
rise
decayed
advection
but
diffusion,
loss
(Ploss)
be
reduced.
This
confirms
viability
employing
structure
thermodynamic
performances
from
micro-combustion
systems.
