capture by Sorption-Enhanced Water- Gas Shift (SEWGS ...T +31 88 515 49 49 [email protected] . F +31 88...
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Pre-combustion CO2 capture by Sorption-Enhanced Water-Gas Shift (SEWGS): Modelling from molecules to process cycles J. Boon (ECN) P.D. Cobden (ECN) H.A.J. van Dijk (ECN) M. van Sint Annaland (TU Eindhoven)
June 2013 ECN-L--13-032
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www.ecn.nl
Pre-combustion CO2 capture by
Sorption-Enhanced Water-Gas Shift (SEWGS):
Modelling from molecules to process cycles
Jurriaan Boon, P.D. Cobden, H.A.J. van Dijk, M. van Sint Annaland
7th Trondheim CCS Conference (TCCS-7) 4-6 June 2013 - Trondheim, Norway
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Pre-combustion CO2 capture
Gazzani et al. Fuel 105 (2013) 206-219
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Pre-combustion CO2 capture
WGS and CO2-H2 separation
Gazzani et al. Fuel 105 (2013) 206-219
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Pre-combustion CO2 capture
WGS and CO2-H2 separation
Manzolini et al. Fuel 105 (2013) 220-227
Selexol
CO2 avoided % 86.5
SPECCA MJLHV / kgCO2 3.71
Cost € / tCO2 36.7
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Pre-combustion CO2 capture
WGS and CO2-H2 separation
Gazzani et al. Fuel 105 (2013) 206-219
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Pre-combustion CO2 capture
WGS and CO2-H2 separation
Gazzani et al. Fuel 105 (2013) 206-219
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Pre-combustion CO2 capture
WGS and CO2-H2 separation
Manzolini et al. Fuel 105 (2013) 220-227
Selexol SEWGS
CO2 avoided % 86.5 93-97
SPECCA MJLHV / kgCO2 3.71 2.5-2.7
Cost € / tCO2 36.7 31-33
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SEWGS
‘Bench’ scale
6 m
K-promoted hydrotalcite ‘Alkasorb’
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SEWGS process steps
Loading and regeneration
AD
SOR
PTI
ON
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SEWGS process steps
Loading and regeneration
AD
SOR
PTI
ON
RIN
SE
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SEWGS process steps
Loading and regeneration
AD
SOR
PTI
ON
RIN
SE
PU
RG
E
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depressurise repressurise
SEWGS process steps
Loading and regeneration
AD
SOR
PTI
ON
RIN
SE
PU
RG
E
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Multicolumn SEWGS
• Cyclic process, repeating – Adsorption
– Rinse
– Depressurisation
– Purge
– Repressurisation
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depressurise repressurise
SEWGS process steps
Modelling fundamentals
AD
SOR
PTI
ON
RIN
SE
PU
RG
E
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SEWGS
Experiments and modelling
Breakthrough experiments
Cyclic experiments
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SEWGS
Experiments and modelling
Breakthrough experiments
Cyclic experiments
Adsorption isotherms
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COLUMN
0 m
0.5 m
1 m
2 m
VALVE BOX
& REDUCER
EXHAUST
MASS
SPECTROMETER
FILTER
EXHAUST
SEWGS
Breakthrough experiments
Sample system
feed
breakthrough
Thermocouple
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SEWGS
Measured & fitted isotherms
0 10 20 300
0.5
1
1.5
2
pCO
2
[bar]
qCO
2
[mol kg-1
]
CO2 only
0 5 10 15 20 25 300
0.5
1
1.5
2
pi [bar]
qi [mol kg
-1]
p(H2O) = 20 bar
p(CO2) = 5 bar
p(CO2) = 20 bar
CO2 and H
2O
0 10 20 300
0.5
1
1.5
2
pH
2O
[bar]
qH
2O
[mol kg-1
]
H2O only
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SEWGS
Reactor model
Breakthrough experiments
Cyclic experiments
Adsorption isotherm
Reactor model
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Reactor model
CO2 and H2O adsorption
• New isotherms – CO2: surface and micropores
– H2O: surface and micropores
– Interaction
• Intraparticle model – Accumulation in the gas phase
– Accumulation in the solid phase 𝜕 𝑐
𝜕𝑡= 𝑘𝐿𝐷𝐹 𝑐𝑖 − 𝑐
𝑘𝐿𝐷𝐹 =15
𝑅2
𝐷𝑒
𝜖𝑝 + 1 − 𝜖𝑝 𝜌𝑝𝜕𝑞𝜕𝑐
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Reactor model
CO2 and H2O adsorption
• New isotherms, linear driving force
• Breakthrough curves match
0%
20%
40%
0 500 1000
Mole fraction [-]
Time [s]
Ar
H2O
CO2
41% H2O
5% CO2
0%
20%
40%
0 500
Mole fraction [-]
Time [s]
Ar
H2O
CO2
26% H2O
14% CO2
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SEWGS
Cycle design
Breakthrough experiments
Cyclic experiments
Adsorption isotherm
Cyclic simulations
Reactor model
Cycle design
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SEWGS
Cycle optimisation
• Fix the number of columns, cycle
• Vary total cycle time, rinse steam flow, purge steam flow
• Calculate carbon capture ratio, CO2 purity
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SEWGS
Conclusions & Outlook
• SEWGS – WGS with H2-CO2 separation
– New isotherm and particle model for CO2-H2O adsorption
– Impact on cycle performance to be assessed
• Alkasorb Alkasorb+
• Application to other processes – H2 production for ammonia
– Syngas conditioning
– Iron and steel making industries
– Acid gas processing
• Ready for scale-up and demonstration!
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Thank you for your attention
ECN
Westerduinweg 3 P.O. Box 1
1755 LE Petten 1755 ZG Petten
The Netherlands The Netherlands
T +31 88 515 49 49 [email protected]
F +31 88 515 44 80 www.ecn.nl
ECN Sustainable Process Technology Paul Cobden Eric van Dijk Coen Hoogland Daan Jansen TU/e Chemical Process Intensification Martin van Sint Annaland
This work has been performed as part of the Dutch national R&D programme for CO2 capture, transport and storage CATO-2.
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ECN-L--13-032 3
ECN Westerduinweg 3 P.O. Box 1 1755 LE Petten 1755 LG Petten The Netherlands The Netherlands T +31 88 515 4949 F +31 88 515 8338 info@ ecn.nl www.ecn.nl