Synthetic.gas

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Unformatted text preview: nd
58.9%
with
CO2
capture
(Gray
et
al.
2007).
 
 The
hydrogasification
and
catalytic
gasification
processes
are
thought
to
be
more
efficient
than
the
 steam‐oxygen
gasification
process.
The
theoretical
efficiency
of
these
processes
is
estimated
to
be
as
 high
as
79.6%
for
hydrogasification
and
72.7%
for
catalytic
gasification
(Steinberg
2005).
Ruby
et
al.
 (2008)
have
estimated
a
thermal
efficiency
of
64.7
%
for
the
hydrogasification
process
using
low‐ranked
 western
(sub‐bituminous)
coal.
The
thermal
efficiency
of
GreatPoint
Energy’s
catalytic
gasification– based
plant
is
reported
to
be
65%
(Great
Point
energy
2008a).
 2.3.
Great
Plains
Synfuels
Plant:
An
Existing
SNG
Plant
 The
Great
Plains
Synfuels
Plant
in
Beulah,
North
Dakota,
is
the
only
commercial
plant
in
the
United
 States
producing
SNG
from
coal.
The
plant,
which
is
owned
and
operated
by
the
Dakota
Gasification
 Company,
a
subsidiary
of
Basin
Electric
Power
Cooperative,
has
been
in
operation
since
1984.
The
key
 figures
of
the
plant
are
listed
in
Table
1.
The
plant
produces
more
than
54
billion
standard
cubic
feet
of
 natural
gas
annually
using
6
million
tons
of
lignite
coal.
The
annual
plant
capacity
factor
is
90%–92%.
The
 Climate
Change
Policy
Partnership
 7
 Synthetic
Natural
Gas
(SNG):
Technology,
Environmental
Implications,
and
Economics
 plant
also
demonstrates
CO2
capture
and
sequestration.
Since
2000,
as
much
as
95
million
standard
 cubic
feet
per
day
of
CO2
has
been
transported
from
the
plant
via
a
205‐mile
pipeline
to
the
Weyburn
Oil
 Field
in
southwestern
Saskatchewan,
Canada,
for
enhanced
oil
recovery
(EOR)
(Perry
and
Eliason
2004).
 The
CO2
production
capacity
is
more
than
200
million
standard
cubic
feet
per
day
(Dakota
Gasification
 Company
2008).
In
addition,
the
plant
also
produces
fertilizers,
solvents,
phenols,
and
other
chemicals.
 
 The
Dakota
gasification
plant
uses
14
Lurgi
Mark
IV
Gasifiers
operating
at
1,204°
C.
Each
gasifier
has
a
 height
of
12.2
meters
and
an
internal
diameter
of
4.0
meters.
The
Rectisol
process
is
used
to
remove
H2S
 and
CO2,
and
a
nickel‐based
catalyst
is
used
in
the
methanation
process.
The
final
gas
is
further
cooled,
 cleaned,
dried,
compressed,
and
supplied
to
consumers
through
a
pipeline.
 
 Table
1.
Key
figures
of
North
Dakota
Gasification
Plant
 Great
Pl...
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This essay was uploaded on 03/18/2014 for the course ENG 316K taught by Professor Kruppa during the Spring '08 term at University of Texas at Austin.

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