As
the
conventional
inert
gas,
it
is
used
for
prevention
and
control
of
coal’s
spontaneous
combustion,
mainly
N2
CO2.
However,
there
limited
research
focusing
on
inerting
effect
composite
gas.
This
paper
studied
impact
using
a
premixed
gas
(N2
accounted
50%,
60%,
70%,
80%)
instead
CO2
nearly
horizontal
gently
inclined
goaf
by
building
physical
similarity
simulation
experiment
platform.
The
experimental
results
showed
that
was
better
than
For
instance,
in
goaf,
optimal
when
70%.
average
O2
concentration
monitored
area
decreased
from
9.7%
with
to
6.4%.
In
addition,
exhibited
an
accumulation
state
similar
CO2,
primarily
occurring
lower
part
region
adjacent
working
face.
Furthermore,
inversely
proportional
its
effect.
study
has
important
reference
significance
applying
fire
extinguishing
technology
mines.
RSC Advances,
Год журнала:
2024,
Номер
14(27), С. 19301 - 19311
Опубликована: Янв. 1, 2024
To
reveal
the
mechanism
of
CO
gas
generation
and
adsorption
in
coal
gangue
slits,
a
new
composite
kaolinite–coal–kaolinite
(KCK)
model
was
constructed
by
combining
HQL
kaolinite
to
characterize
crack
structure
gangue.
Coal,
as
a
heterogeneous
porous
medium,
exhibits
substantial
adsorption
capacity
for
coalbed
methane,
highlighting
the
necessity
to
comprehend
methane
storage
mechanisms
reserve
evaluation
and
production
optimization.
To
investigate
characteristics
of
novel
approach
calculating
thermodynamic
parameters
is
developed
based
on
phase
equilibrium
fugacity
principles.
Isothermal
experimental
results
are
utilized
assess
influence
moisture
mechanism,
disclosing
variations
in
enthalpy,
entropy,
Gibbs
free
energy
supercritical
methane.
The
findings
reveal
pronounced
reduction
under
hydrated
conditions.
Methane
onto
coal
identified
an
exothermic,
entropy-decreasing,
non-spontaneous
process
dominated
by
microporous
filling
monolayer
adsorption.
Langmuir
Dubinin–Radushkevich
model
confirms
that
accounts
over
10%
total
high-temperature
high-pressure
Additionally,
temperature
changes
within
seams
during
distinct
phases,
ranging
from
1
18
K,
quantified.
A
predictive
method
isothermal
curves
using
introduced,
with
accuracy
6%
error
margin.
These
insights
offer
theoretical
support
modeling
gas–water
flow
dynamics
reservoirs.
Massive
quantities
of
NH3
generated
after
blasting
in
underground
coal
mines
are
believed
to
enhance
the
adsorption
O2
by
and
accelerate
rate
coal's
spontaneous
combustion
oxidation.
The
behavior
for
provides
critical
insights
into
mechanisms
combustion.
This
research
was
conducted
on
Xiaolongtan
lignite,
examining
characteristic
NH3/O2
binary
gas
mixtures
single-component
lignite
at
278.15-323.15
K
0-500
kPa
using
Grand
Canonical
Monte
Carlo
simulations.
Additionally,
kinetic
properties
lignite/NH3
lignite/O2
systems
were
analyzed
molecular
dynamics
results
revealed
that
isotherms
conformed
well
Langmuir
equation.
Under
specified
conditions,
amount
decreased
with
increasing
temperature,
followed
order:
>
O2.
selectivity
coefficient
largely
unaffected
molar
ratio
but
as
temperature
increased.
integral
area
relative
concentration
curve
confirmed
onto
maintaining
order
identical
temporal
mean
square
displacement
diffusion
coefficients
gases
increased
exhibiting
a
higher
than
NH3.
Furthermore,
interaction
energy
increased,
strongest
interactions
same
temperature.
