Process design and analysis of dual phase membanes
1. 1
Process design and analysis of
dual-phase membranes for
off-shore post-combustion capture
from gas turbines
Rahul Anantharaman
SINTEF Energy Research
Michael McCann, Thijs Peters, Marie-Laure Fontaine, Partow P. Henriksen, Thor Mejdell
SINTEF Materials and Chemistry
7th
June, 2013
3. Background
►CO2 capture from industry is an important part of the
solution for climate change mitigation
►Four case studies selected in BIGCCS for CO2 capture
from industry
►CO2 emissions from off-shore facilities are some of the
largest point sources.
►CO2 capture from gas turbines on board an Floating
Production Storage and Offloading (FPSO) unit one of
selected case study.
3
4. Case Study
►Aim:
CO2 capture from 6 x 20 MW Gas Turbines (GT) on board an
FPSO
►GT specifications (each)
Power: 20 MW (Simple cycle)
Thermal efficiency: 36.4% LHV
Exhaust flow: 67.4 kg/s
Exhaust temperature: 466 °C
CO2 concentration in exhaust: 3 vol%
4
5. Challenges
►All of the challenges offshore are the same as the ones
faced by on-shore industry, in addition to size, weight and
stability (wave motion).
►Space- and weight challenges implies the size of the
capture installations will be of importance when selecting
capture technology
5
7. Motivation
► MEA and other solvent based capture technologies
Gas-liquid interface
Steam/utility requirement
Require large absorber
GT exhaust needs to be cooled
► Membrane contactors not effective for this case
► Polymeric membranes
Multi-stage process due to selectivity limitations
High energy consumption and membrane area/volume
GT exhaust needs to be cooled
7
8. Motivation
►Design conceptual process with
No gas – liquid interface
Operate at high temperature
No steam requirement
Comparable or lower volume and energy consumption than
reference case
8
9. Dual-Phase Membrane Concept
►New interesting membrane type with potential of high
temperature operation (450°C-800°C)
►Interconnected molten carbonate phase in a porous
ceramic support matrix of an oxygen ion conductor
9
10. Process design
10
( )RTE
CO
permeate
CO
feedside
CO
a
e
p
p
L
a
J /
2 2
2
ln
=
►For a given membrane
thickness, increase flux by
Increasing feed pressure
Decreasing permeate pressure
Decreasing permeate xCO2
Increasing operating temperature
19. Reference case – MEA process
►Reference case simulation for MEA process was
performed in CO2SIM
19
20. Reference case - MEA process
Power Consumption
►Exhaust gas fans: 8 MWe
►Solvent circulating pumps: 4.8 MWe
►Reboiler duty: 60.7 MWth
►Steam parameters: 3 bar 145°C
►Equivalent Power: 20 MWe
►Total power consumption: 32.8 MWe
20
Gottlicher, G, Energetics of CO2 capture
23. Conclusions
►Dual phase membranes show promising performance
►Preliminary results comparing to MEA process indicate
lower process equipment volume
Comparable/lower energy penalty for CO2 capture
►It is expected that dual phase membranes will perform
better for "standard" NGCC post-combustion capture
►Novel technology in early phase of development
►Potential issues
Membrane development and performance
Feasibility of high temperature vacuum pump
23
24. Acknowledgements
This publication has been produced with support from the BIGCCS
Centre, performed under the Norwegian research program Centres for
Environment-friendly Energy Research (FME). The authors acknowledge
the following partners for their contributions: Aker Solutions,
ConocoPhillips, Gassco, Shell, Statoil, TOTAL, GDF SUEZ and the
Research Council of Norway (193816/S60).