Abstract
In this paper, the performances of two iron-based syngas-fueled chemical looping (SCL) systems for hydrogen (H2) and electricity production, with carbon dioxide (CO2) capture, using different reactor configurations were evaluated and compared. The first investigated system was based on a moving bed reactor configuration (SCL-MB) while the second used a fluidized bed reactor configuration (SCL-FB). Two modes of operation of the SCL systems were considered, namely, the H2 production mode, when H2 was the desired product from the system, and the combustion mode, when only electricity was produced. The SCL systems were modeled and simulated using Aspen Plus software. The results showed that the SCL system based on a moving bed reactor configuration is more efficient than the looping system with a fluidized bed reactor configuration. The H2 production efficiency of the SCL-MB system was 11 % points higher than that achieved in the SCL-FB system (55.1 % compared to 44.0 %). When configured to produce only electricity, the net electrical efficiency of the SCL-MB system was 1.4 % points higher than that of the SCL-FB system (39.9 % compared to 38.5 %). Further, the results showed that the two chemical looping systems could achieve >99 % carbon capture efficiency and emit ~2 kg CO2/MWh, which is significantly lower than the emission rate of conventional coal gasification-based plants for H2 and/or electricity generation with CO2 capture.
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Abbreviations
- AGR:
-
Acid gas removal
- AR:
-
Air reactor
- ASU:
-
Air separation unit
- CaL:
-
Calcium looping
- CCR:
-
Carbon capture rate (%)
- CGE:
-
Cold gas efficiency (%)
- CLC:
-
Chemical looping combustion
- FB:
-
Fluidized bed
- FR:
-
Fuel reactor
- HP:
-
High pressure
- HRSG:
-
Heat recovery steam generator
- IGCC:
-
Integrated gasification combined cycle
- IP:
-
Intermediate pressure
- LHV:
-
Lower heating value (MJ/kg)
- LP:
-
Low pressure
- MB:
-
Moving bed
- MDEA:
-
Methyldiethanolamine
- MEA:
-
Monoethanolamine
- OC:
-
Oxygen carrier
- PB:
-
Packed bed
- PC:
-
Pulverized coal
- PSA:
-
Pressure swing adsorption
- SCL:
-
Syngas chemical looping
- SE:
-
Specific emissions (kg/MWh)
- SR:
-
Steam reactor
- ST:
-
Steam turbine
- W:
-
Power (MW)
- \({\dot{m}}\) :
-
Mass flow rate (kg/s)
- ṅ :
-
Molar flow rate (kmol/s)
- η :
-
Efficiency (%)
- ar:
-
As received
- db:
-
Dry basis
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Acknowledgements
This work was partly carried out by the first author at the Institute for Energy Systems (Technical University of Munich) as part of his postdoctoral research program under the TUFF Grant. Second author would like to acknowledge the financial support through the strategic grant POSDRU107/1.5/S/77265 provided by the Ministry of Labor, Family and Social Protection (Romania), and co-financed by the European Social Fund.
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Cebrucean, D., Cebrucean, V., Ionel, I. et al. Performance of two iron-based syngas-fueled chemical looping systems for hydrogen and/or electricity generation combined with carbon capture. Clean Techn Environ Policy 19, 451–470 (2017). https://doi.org/10.1007/s10098-016-1231-y
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DOI: https://doi.org/10.1007/s10098-016-1231-y