The Mechanism of the Increased Ratio of Nitrogen Dioxide to Nitrogen Oxides in Methanol/Diesel Dual Fuel Engines
Energy,
Год журнала:
2024,
Номер
312, С. 133701 - 133701
Опубликована: Ноя. 2, 2024
Язык: Английский
Effects of methanol energy substitution ratio and diesel injection timing on a methanol/diesel dual-fuel direct injection engine
Xiaojun Yin,
Yan Yu,
Xianfeng Ren
и другие.
Fuel,
Год журнала:
2024,
Номер
382, С. 133773 - 133773
Опубликована: Ноя. 21, 2024
Язык: Английский
Exploration and optimization of injection strategy for medium-speed diesel/methanol dual direct-injection marine engine under extremely high methanol energy ratio
Energy Sources Part A Recovery Utilization and Environmental Effects,
Год журнала:
2025,
Номер
47(1), С. 1289 - 1307
Опубликована: Янв. 3, 2025
Methanol
is
considered
as
one
of
the
most
promising
efficient
and
clean
alternative
fuels
for
marine
engines.
However,
increased
methanol
energy
ratio
(MER)
by
direct
injection
can
easily
cause
extended
ignition
delay
thereby
misfiring.
To
maximize
MER
achieve
stable
combustion
medium-speed
diesel/methanol
dual
direct-injection
engines
under
extremely
high
MER,
a
3D
computational
fluid
dynamics
(CFD)
model
engine
established
using
CONVERGE/3.0
code.
The
suitable
fuel
injector
configurations
are
explored,
strategy
optimized
an
96.5%
based
on
CFD
model.
findings
demonstrate
that
mixing
rate
diesel
jets
enhanced
symmetric
injectors
compared
to
asymmetric
their
effects
mechanism
spray
development.
indicated
thermal
efficiency
(ITE)
from
45.5%
48.3%
through
advancing
timing
0°CA
BTDC
25°CA
BTDC.
Additionally,
optimal
strategies
characterizing
highest
ITE
48.3%,
lower
global
emissions,
among
cases
yielded
with
duration
40°CA
pressure
56
MPa;
26.4
MPa
condition,
improved
15.9%.
Язык: Английский
Study on a Self-Driven Mineral Carbonation Path in Solid Waste
Energy & Fuels,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 8, 2025
Язык: Английский
Effect of Auxiliary Hydrogen Injection in the Prechamber on the Combustion Process of a Natural Gas Engine
ACS Omega,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 20, 2025
Prechamber
jet
ignition,
as
an
efficient
ignition
technology,
can
enhance
stability
and
enable
rapid
combustion.
The
mixture
formation
flow
dynamics
inside
the
prechamber
are
very
important
for
process
engine
performance.
Active
is
effective
method
to
achieve
turbulent
but
at
present
there
currently
limited
understanding
of
impact
auxiliary
fuel
injection
(AFI)
in
active
prechamber.
In
this
study,
it
suggested
use
hydrogen
improve
prechamber,
thereby
improving
performance
jet.
influences
AFI
on
combustion
studied
by
numerical
simulation.
Under
different
strategies,
in-cylinder
flow,
processes
simulated.
effect
schemes
combustion,
characteristics,
main
chamber,
radicals,
compared.
results
show
that
operating
natural
gas
under
lean
burn
conditions
increases
indicated
thermal
efficiency
lowers
NOx
emissions.
introduction
shortens
time
interval
between
spark
timing
hot
jet,
advancing
chamber.
As
amount
injected
rises,
velocity
temperature
increase,
so
strengthened.
Moreover,
flows
into
chamber
chemical
activity
there.
combination
with
significantly
improves
accelerates
rate
showing
potential
expand
limit
engines.
Язык: Английский
Overview for methanol and formaldehyde unregulated emissions of methanol fueled engines
Journal of the Energy Institute,
Год журнала:
2025,
Номер
unknown, С. 102089 - 102089
Опубликована: Апрель 1, 2025
Язык: Английский
Visualization study on the effects of water addition on microscopic and macroscopic spray characteristics of methanol with high-pressure direct injection
Fuel,
Год журнала:
2025,
Номер
396, С. 135361 - 135361
Опубликована: Апрель 15, 2025
Язык: Английский
Combustion and Emission Characteristics of Methanol–Diesel Dual Fuel Engine at Different Altitudes
Journal of Marine Science and Engineering,
Год журнала:
2024,
Номер
12(12), С. 2210 - 2210
Опубликована: Дек. 2, 2024
Currently,
in
the
two
technological
approaches
for
using
diesel
pilot
injection
to
ignite
methanol
and
partially
substituting
fuel
with
methanol,
neither
can
fully
achieve
carbon
neutrality
context
of
internal
combustion
engines.
Compression-ignition
direct-injection
marine
engines
exhibit
significant
application
potential
because
their
superior
economy
lower
emissions.
However,
low
cetane
number
coupled
its
high
ignition
temperature
latent
heat
vaporization,
poses
challenges,
especially
amidst
increasingly
stringent
emission
regulations.
It
is
imperative
comprehensively
explore
impacts
engine
geometry,
intake
boundary
conditions,
strategies
on
performance.
This
paper
first
investigates
influence
compression
ratio
performance,
subsequently
analyzes
effects
conditions
characteristics,
finally
compares
characteristics
under
different
timings.
When
set
at
13.5,
only
an
timing
−30
°CA
initiate
ignition,
but
not
ideal.
For
ratios
15.5
17.5,
all
timings
studied
methanol.
Reasonable
increases
pressure
are
beneficial
ignition.
when
rises
from
400
K
500
K,
a
decrease
thermal
efficiency
observed.
Particularly,
°CA,
both
peak
cylinder
higher,
occurs
earlier,
process
shifts
forward,
indicated
higher
levels.
Furthermore,
overall
emissions
NOX,
HC,
CO
relatively
low.
Therefore,
selecting
appropriate
crucial
facilitate
low-load
conditions.
Язык: Английский
Effects of Diesel Pre-Injection Time on Combustion Process and Emission Characteristics of Diesel/Methanol Dual Fuel Engine
Combustion Science and Technology,
Год журнала:
2024,
Номер
unknown, С. 1 - 18
Опубликована: Окт. 9, 2024
The
traditional
diesel
engine
not
only
causes
the
reduction
of
nonrenewable
energy
but
also
aggravates
environmental
pollution.
utilization
renewable
fuels
in
can
effectively
reduce
dependence
on
oil
sources
emissions.
As
a
oxygen-containing
fuel
with
low
production
cost
and
widely
sourced,
methanol
holds
vast
potential
for
application
engine.
dual-fuel
combustion
has
emerged
as
an
important
research
issue
internal
industry.
This
paper
conducted
study
emission
characteristics
diesel/methanol
dual
based
optical
test
platform
3D
numerical
simulation
software.
results
show
that
change
cylinder
pressure
is
relatively
small
heat
release
rate
increases
advance
pre-injection
time.
time
mainly
affects
mixture
distribution
diesel,
more
evenly
mixed
degree
premixed
becomes
higher,
will
lead
to
rapid
combustion,
so
peak
shows
increasing
trend.
advanced,
resulting
leaner
early
stage,
easy
burn,
CA10
CA50
are
delayed.
soot
formation
decreases
uniform,
number
pixels
KL
factor
each
range
decreases.
average
temperature
reduced
NOX
decreasing
trend
CO
generation
Язык: Английский