Tar-rich
coal
that
yields
oil
and
gas
resources
is
abundant
in
northwestern
China.
However,
due
to
variations
the
coal-forming
environment,
occurrence
of
tar-rich
its
key
molecular
structures
differ
across
layers
regions,
which
induces
pyrolysis
process
these
coals
are
different.
Here,
four
samples
with
different
tar
indicated
various
facies
were
investigated
by
thermogravimetric
analysis
in-situ
transmission
FTIR.
Based
on
comprehensive
results
research,
have
a
significant
effect
yield
controlling
structure.
Specifically,
formed
stronger
reducing
environment
higher
content
aliphatic
oxygen-containing
functional
groups,
more
Cal-Cal,
Cal-H,
Cal-O,
Cal-N
bonds
breaking
up
during
pyrolysis,
approximately
60%
total
broken
chemical
bond
content,
also
corresponds
samples.
During
process,
it
was
further
observed
FTIR
had
-CH2-,
-CH-,
C-O,
C=O
participated
reaction.
These
showed
faster
thermal
decomposition
rate
after
400
°C,
high
-CH2-
-CH-
affected
changes
-CH-/-CH2-,
-CH-/-CH3,
-CH2-/-CH3
values
influence
structural
types
groups
coal.
After
degree
reduction
structure
than
free-ends
-CH3
structures.
Coal
weaker
significantly
Additionally,
formation
gaseous
products
from
closely
related
evolution
residual
accumulation
increases
enhancement
condition
environment.
Energy Sources Part A Recovery Utilization and Environmental Effects,
Journal Year:
2024,
Volume and Issue:
46(1), P. 14856 - 14872
Published: Oct. 25, 2024
In-situ
pyrolysis
of
tar-rich
coal
can
alleviate
the
external
dependence
oil
and
gas
in
China,
achieve
efficient
safe
exploitation
coal.
In
fact,
nano-pores
heterogeneity
undergo
significant
changes
during
pyrolysis,
but
there
is
currently
limited
research,
which
seriously
restricts
utilization
this
study,
pore
characteristics
were
studied
by
microwave
experiment,
adsorption
results
multifractal
theory,
evolution
mechanism
pores
was
proposed.
The
show
that
significantly
promoted
development
nano-pore
size
distribution
after
showed
obvious
characteristics,
influence
sparse
area
on
more
obvious,
while
increases
initially
subsequently
drops
with
temperature.
Moreover,
occurred
three
stages.
Stage
I,
total
volume
changed
little,
increasing
only
from
0.06851
to
0.09463
ml/g,
thermal
cracking
main
reason
for
development.
II,
numerous
produced
as
a
result
products'
generation,
grew
rapidly
increased
0.331
ml/g.
III,
liquid
hydrocarbons
precipitated
volatile
products
blocked
nano-pores,
so
PV
began
decrease.
0.19967
ml/g
at
1000°C.
This
study
provides
guidance
investigation
enriches
theory
in-situ
Tar-rich
coal
that
yields
oil
and
gas
resources
is
abundant
in
northwestern
China.
However,
due
to
variations
the
coal-forming
environment,
occurrence
of
tar-rich
its
key
molecular
structures
differ
across
layers
regions,
which
induces
pyrolysis
process
these
coals
are
different.
Here,
four
samples
with
different
tar
indicated
various
facies
were
investigated
by
thermogravimetric
analysis
in-situ
transmission
FTIR.
Based
on
comprehensive
results
research,
have
a
significant
effect
yield
controlling
structure.
Specifically,
formed
stronger
reducing
environment
higher
content
aliphatic
oxygen-containing
functional
groups,
more
Cal-Cal,
Cal-H,
Cal-O,
Cal-N
bonds
breaking
up
during
pyrolysis,
approximately
60%
total
broken
chemical
bond
content,
also
corresponds
samples.
During
process,
it
was
further
observed
FTIR
had
-CH2-,
-CH-,
C-O,
C=O
participated
reaction.
These
showed
faster
thermal
decomposition
rate
after
400
°C,
high
-CH2-
-CH-
affected
changes
-CH-/-CH2-,
-CH-/-CH3,
-CH2-/-CH3
values
influence
structural
types
groups
coal.
After
degree
reduction
structure
than
free-ends
-CH3
structures.
Coal
weaker
significantly
Additionally,
formation
gaseous
products
from
closely
related
evolution
residual
accumulation
increases
enhancement
condition
environment.
