capture of co 2 from flue gases with cao. results in a 30 kw interconnected fluidized bed facility...
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Capture of CO2 from flue gases with CaO. Results in
a 30 kW Interconnected Fluidized Bed Facility
ISCR4, Imperial College. London 2008
• Description of the test facility and the nature of data obtained• A sample of experimental results• Closure of carbon balances
C. Abanades, M. Alonso, N. Rodríguez, B. González, F. Fuentes, G. Grasa, R Murillo
CARBONATORCARBONATOR CALCINERCALCINERCOMBUSTORCOMBUSTOR
Concentrated CO2
CoalCaCO3 (F0)
CaO Purge
CaCO3
CaOFlue Gas(FCO2)
Flue gas“without” CO2
Coal Air
O2
Air
N2
ASU
Postcombustion CaO looping
Shimizu et al 1999
Calciner
CO2FCO2 Ecarb
Carbonator
FCO2
CaO
CaCO3
FCaO
FCaO x carb
F0
Measuring gas concentrations depending on gas split in the loop seal
Air
Split = 1
Air+CO2 Air+fuel
Measuring gas concentrations depending on gas split in the loop seal
Split = 0
Air+CO2
Air
Time (s)
y = 1.0883e-0.0114x
R2 = 0.7222
0
0.2
0.4
0.6
0.8
1
1.2
0 50 100 150 200
Gs
(kg
/m2s
))
Gs (kg/m2s)
y = 2.0415e-0.0216x
R2 = 0.805
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
0 50 100 150 200 250 300
Tiempo transcurrido (s)
Gs
(kg
/m2s
))
Gs (kg/m2s)
Time (s)
Measuring solid circulation rates from P measurements in the carbonator when turning off loop seal
RIS
ER
CA
RB
ON
AT
OR
Loop seal
RIS
ER
CA
LCIN
ER
Loop seal
Valve 2 close
Valve 1 close Valve 1 close
O2 probe
Spyhole
Measuring solid circulation rates during solid sampling
Valve 1 open
Valve 2 open
Overview of 30 kW test rig (2007)
Capture of CO2 from flue gases with CaO. Results in
a 30 kW Interconnected Fluidized Bed Facility
ISCR4, Imperial College. London 2008
• Description of the test facility and the nature of data obtained• A sample of experimental results• Closure of carbon balances
Example of experimental results with a batch of CaO
0
100
200
300
400
500
600
700
800
900
20:00 20:05 20:10 20:15 20:20 20:25 20:30 20:35 20:40 20:45 20:50 20:55 21:00
Tiempo (h:min)
Tem
per
atu
ra d
el le
cho
(ºC
)
0
5
10
15
20
25
Co
nce
ntr
ació
n d
e C
O2
(% V
ol.)
Temperatura del lecho Concentración de CO2
Inicio de la
carbonatación
Medición CO2 a la entrada del carbonatador
Final de la
carbonatación
Medición CO2 a la salida del carbonatador
0
100
200
300
400
500
600
700
800
900
20:00 20:05 20:10 20:15 20:20 20:25 20:30 20:35 20:40 20:45 20:50 20:55 21:00
Tiempo (h:min)
Tem
per
atu
ra d
el le
cho
(ºC
)
0
5
10
15
20
25
Co
nce
ntr
ació
n d
e C
O2
(% V
ol.)
Temperatura del lecho Concentración de CO2
Inicio de la
carbonatación
Medición CO2 a la entrada del carbonatador
Final de la
carbonatación
Medición CO2 a la salida del carbonatador
CO2 entering intothe carbonator
CO2 leaving the carbonator
Carbonation starts Carbonation
ends
Bed Temperature CO2 Concentration
Bed
Te
mp
era
ture
CO
2 C
once
ntr
atio
n
Time
CarbonatorTemperature = 655 ºC
CCO2 in = 14.0%
CCO2 out = 8.6%
Ecarb = 42%ΔPcarb = 9 cm
carbonator calciner
Gs=0.5 kg/m2s
Ecarb=21%
Ecarb=33%Ecarb=92%
Ecarb=15%
Ecarb=94%
Ecarb=35%
carbonator calciner
Time (h:min)
T4 T5 T6 T7 T8 Carbonator
CO2 entry
Ecarb=28%Ecarb=82%
Time (h:min)
carbonator calciner
Gs=0.7 kg/m2s
Air increaseCO2 increase
Capture of CO2 from flue gases with CaO. Results in
a 30 kW Interconnected Fluidized Bed Facility
ISCR4, Imperial College. London 2008
• Description of the test facility and the nature of data obtained• A sample of experimental results• Closure of carbon balances
Juan Carlos Abanades, Mónica Alonso, Nuria Rodríguez, Belén González, Gemma Grasa,Ramón Murillo, Fernando Fuentes
Calciner
CO2FCO2 Ecarb
Carbonator
FCO2
CaO
CaCO3
FCaO
FCaO x carb
F0
Ideally:
FCO2 Ecarb = FCaO Xcarb=NCaOrcarb
reactor
out 2in 2
ACOCO
Scarb
GPM
X
Carbon balance in the gas and the circulating solids
Conclusions
The 30 kW prototype of INCAR-CSIC has demonstrated the technical viability of the carbonate looping cycles, operating at conditions relatively close to those expected in a flue gas CFB carbonator.
• Modifications (in progress) are necessary in the rig to attain longer periods of stable operation.
•The carbonator reactor works “as expected”. A modeling exercise is required (in progress) for a better interpretation of results and scaling up.
Acknowledgement
This work has been conducted under a contract Hunosa-CSIC