Publication: Thermodynamic analysis of the novel chemical looping process for two-grade hydrogen production with CO2 capture
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Issued Date
2019
Resource Type
File Type
application/pdf
ISSN
1968904
Other identifier(s)
2-s2.0-85056229180
Rights Holder(s)
Scopus
Bibliographic Citation
Energy Conversion and Management. Vol 180, (2019), p.325-337
Suggested Citation
Saithong N., Authayanun S., Patcharavorachot Y., Arpornwichanop A. Thermodynamic analysis of the novel chemical looping process for two-grade hydrogen production with CO2 capture. Energy Conversion and Management. Vol 180, (2019), p.325-337. doi:10.1016/j.enconman.2018.11.003 Retrieved from: https://hdl.handle.net/20.500.14740/5499
Abstract
The integrated sorption-enhanced chemical looping reforming and water splitting (SECLR-WS) process was proposed for hydrogen (H2) production from biogas using iron oxide as an oxygen carrier and calcium oxide (CaO) as a carbon dioxide (CO2) adsorbent. In the SECLR-WS process, the biogas feed is partially oxidized using iron oxide and CO2 is captured by CaO in the fuel reactor (FR) to produce H2-rich syngas. The iron oxide is re-oxidized in the steam reactor (SR) to generate a high-purity H2 stream and CaO is regenerated in the calcinator. The simulation of the SECLR-WS process was based on a thermodynamic approach and was performed using an Aspen Plus simulator. The effects of key parameters such as the steam feed to the FR to methane (SFR/CH4) and iron (II, III) oxide (Fe3O4) to CH4 (Fe3O4/CH4) molar ratios on the process performance in terms of H2 yield and purity, and CH4 conversion were investigated. The results showed that the H2 yield, H2 purity in the FR, and CH4 conversion could be improved by increasing the SFR/CH4 and CaO/CH4 molar ratios. A total H2 yield of 3.8 and a H2 purity in the FR of 97.01 mol% can be obtained at the FR and SR temperatures of 610 and 500 °C, and SFR/CH4, CaO/CH4, Fe3O4/CH4, and SSR/CH4 molar ratios of 2.2, 1.66, 1, and 2.87, respectively. The molar concentration of carbon monoxide (CO) in the high-purity H2 stream could be reduced by increasing the pressure in the SR and the amount of CO2 in the biogas feed stream negatively affected the performance of the system. In addition, increasing the Fe3O4/CH4 molar ratio can improve the heat demand in the FR. © 2018 Elsevier Ltd
Subject(s)
Biogas
Carbon dioxide
Carbon monoxide
Computer software
High pressure effects
Hydrogen
Hydrogen production
Lime
Magnetite
Reforming reactions
Thermoanalysis
Aspen Plus Simulators
Chemical-looping process
Chemical-looping reforming
Process performance
Sorption enhanced reforming
Thermo dynamic analysis
Thermodynamic approaches
Water splitting
Iron oxides
Carbon dioxide
Carbon monoxide
Computer software
High pressure effects
Hydrogen
Hydrogen production
Lime
Magnetite
Reforming reactions
Thermoanalysis
Aspen Plus Simulators
Chemical-looping process
Chemical-looping reforming
Process performance
Sorption enhanced reforming
Thermo dynamic analysis
Thermodynamic approaches
Water splitting
Iron oxides