H2Tech - Q2 2022 - 34

CAPITAL PROJECTS
C1 - methane
Raw natural gas
Gas processing plant
* Deep cut
* Dewpoint control
(existing or new)
C2 - ethane
(optional)
C3/C4 - LPG
(optional)
C5 + condensate
(optional)
FIG. 5. Carseland GTL plant.
FIG. 3. GTL process concept.
in both cases, the CI was approximately
6 kg CO2
e/kg H2
CO2 disposal
124 tpd
SMR CO2
emissions
137 tpd
FT tail gas recycle
Excess H2
SMR
Net gas
5.4 MMft3
d
syngas
generator
SMR fuel
Raw
syngas
management
Offgas fuel = Tail gas
purge + Excess H2
FIG. 4. Enhanced GTL processb
flow schematic.
or sequestered in useful chemicals,
such as FT fuels or methanol,
rather than being emitted into the
atmosphere as CO2
* The quantity of blue H2
produced
is flexible and can be varied by
changing the steam/carbon ratio
(S/C) feeding the SMR
* The combined production of H2
and synthetic chemicals/fuels is
economic at small scale and scalable
to meet local market requirements.
Industrial application: The Carseland
GTL plant. A Canadian companya
has
designed and constructed a
new GTL plant near Carseland, Alberta
(FIG. 5) that uses a proprietary version of
the above processb
with synthetic dieselc
to co-generate blue H2
. The plant has the
capacity to produce 450 bpd of synthetic
diesel using 7.4 million cubic feet per day
(MMft3
d) of natural gas feed with H2
34 Q2 2022 | H2-Tech.com
co-production, or 5.4 MMft3
ral gas without; its H2
d of natuoutput
capacity is
6 MMft3d (16.5 metric tpd). The company
plans to immediately increase SMR
capacity and maximize synthetic diesel
production to 614 bpd with maximum
co-production of 12.8 MMft3
metric tpd) of blue H2
d (34.9
.
CO2 management study: Carseplant.
A study was commissioned
land GTL plant vs. conventional blue
H2
to verify the carbon management comparison
between the proprietary process
used at the Carseland plant and one already
in use elsewhere to produce blue
H2
tional blue H2
. An operating example of a convenproject
using SMR with
pre-combustion carbon capture and
sequestration (CCS) was locatedd
and
detailed observations made (TABLE 1).3
The study demonstrated parity between
the Carseland GTL Project's CI and that
of its more conventional counterpart:
FT liquid
production
Synthetic
dieselc
distillation
and storage
Synthetic
dieselc
naphtha
450 bpd
CCS
90%+recovery
Optional
PSA
unit
Optional
co-generated
blue H2
14 tpd
99.99+ pure
. The Carseland GTL
Project, however, achieved these results
without making use of CCS facilities,
opting instead for a carbon capture and
utilization
equivalent carbon in synthetic diesel.
Economics of blue H2
approach and storing the
production
at the Carseland GTL plant. TABLE 2
describes the current (2021) market
commodity pricing used to establish the
economic potential of the process used
at Carseland. Based on this, as FIG. 6 illustrates,
the economic potential of this
process is a > 20% internal rate of return
(IRR) before tax for a plant producing
500 bpd of synthetic diesel and 16 metric
tpd-34 metric tpd co-generated blue H2
These calculations assume H2
> CAD $2.00 (U.S. $1.50) per kg.
.
prices of
Carseland GTL plant: Planned projects
leading to net-zero. The following
projects are planned for the Carseland
GTL plant to establish a path to net-zero
emissions by 2025 (FIG. 7):
1. H2
co-production project to
achieve CI = 95 g CO2e/MJ diesel,
which would achieve CI targets
for 2022 according to Canada's
low-carbon fuel standards
2. Post-combustion CCUS and/or
biomass syngas (25% capacity)
to meet and exceed Canada's
and British Columbia's 2030
low-carbon fuel standard3
3. Raw field gas to achieve CI
< 60 g CO2
e/MJ diesel
4. Integration of a renewable
hydrotreating diesel plant
to achieve CI = 25 or less g
CO2
e/MJ diesel.
Case Study 1: Carseland GTL
plant-capacity to decarbonize Alberta
natural gas supply. Based on the
GTL
Sales gas (optional)
Blue H2
Synthetic
diesel and jet
Naphtha
(optional)
C5 + Condensate
C2 + Ethane
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