Chemical looping deoxygenated gasification: An implication for efficient biomass utilization with high-quality syngas modulation and CO2 reduction

Zhao Sun, Zong Chen, Sam Toan, Zhiqiang Sun

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Chemical looping gasification is a promising technology for biomass utilization. However, the biomass-derived products contain tar and CO2, which seriously affects the syngas quality and hinders its development. A new approach, chemical looping deoxygenated gasification (CLDG), was proposed for high-quality, H2/CO-tunable syngas generation with CO2 utilization via redox looping of CaO + Fe ↔ Ca2Fe2O5. The CLDG process involves a deoxygenation reactor (DR) and a regeneration reactor (RR). Fe0 continuously reduces the oxygen-containing species to drive high-quality syngas production in the DR, and the oxidized oxygen carrier (Fe3+) can be reduced under CO in the RR. A thermodynamic simulation was conducted to verify the feasibility of CLDG using Aspen Plus. The effects of DR and RR temperatures, of the molar ratios of Fe/Obio, CO2/C, H2O/C, and (C + CO)/Fe on the syngas quality, H2/CO molar ratio, and the efficiency of gasification, chemical looping deoxygenation, and CO2 reduction were investigated intensively and optimized to guide the CLDG process. The results indicate that CLDG can significantly improve the quality of syngas with various H2-to-CO syngas modulations and CO2 reduction, obtaining a lower heating value (LHV) of 9.07 MJ/m3, a gasification efficiency of 96.31%, a CO2 reduction efficiency of 44.51%, an H utilization efficiency of 79.52%, and a chemical looping deoxygenation efficiency of 17.55%.

Original languageEnglish (US)
Article number112913
JournalEnergy Conversion and Management
Volume215
DOIs
StatePublished - Jul 1 2020

Bibliographical note

Funding Information:
This work was supported by the Open Funds of the Key Laboratory of Eco-restoration of Regional Contaminated Environment ( Shenyang University ), the Ministry of Education (Grant No. 2019_ERRCE_K3), the National Natural Science Foundation of China (Grant No. 51876224 ), the Hunan Provincial Natural Science Foundation of China (Grant No. 2017JJ1031 ), and the Innovation-Driven Project of Central South University (Grant No. 2020CX008 ).

Funding Information:
This work was supported by the Open Funds of the Key Laboratory of Eco-restoration of Regional Contaminated Environment (Shenyang University), the Ministry of Education (Grant No. 2019_ERRCE_K3), the National Natural Science Foundation of China (Grant No. 51876224), the Hunan Provincial Natural Science Foundation of China (Grant No. 2017JJ1031), and the Innovation-Driven Project of Central South University (Grant No. 2020CX008).

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • CO reduction
  • Chemical looping
  • Deoxygenated gasification
  • Oxygen carrier
  • Syngas modulation

Fingerprint

Dive into the research topics of 'Chemical looping deoxygenated gasification: An implication for efficient biomass utilization with high-quality syngas modulation and CO2 reduction'. Together they form a unique fingerprint.

Cite this