Coal char-fueled chemical looping combustion use different ironbased oxygen carriers

Liangyong Chen, Fang Liu, Nikolic Heather S, Zhen Fan, Kunlei Liu

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

Solid-fueled chemical looping combustion (SF-CLC) is an advanced process for highly efficient coal combustion with in-situ CO2 capture. The key issue in the development of SF-CLC is the ability of the oxygen carrier (OC) material to improve the gasification rate and combustion efficiency. In this study five iron-based materials were investigated as OCs using a bench-scale fluidized bed reactor. These materials were ilmenite ore (N-FeOC-1), an industrial by- product based iron OC (N-FeOC-2), 50% Fe2O3 supported on Al2O3(S-FeOC-1), 50% Fe2O3 supported on 48% Al2O3 and 2% Na2O (S-FeOC-2), and the third OC with 2% Na2O being coated on the particle surface (S-FeOC-3). Char prepared from Eastern and Western Kentucky Coal (USA) and 50 vol% water vapour were used as the fuel and the gasification/fluidizing agent, respectively. The rate of char conversion and in-situ syngas conversion in SF-CLC were the primary focus of this study and an attempt at improvement was made by adding a small amount alkaline metal using various methods. It was found that N-FeOC-2 and S-FeOC-3 showed excellent performance. Additionally, the method of adding the alkaline metal (Na+) to SF-CLC system showed an important effect on the gasification rate and in-situ syngas conversion.

Original languageEnglish
Pages (from-to)73-79
Number of pages7
JournalEnergy Procedia
Volume63
DOIs
StatePublished - 2014
Event12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014 - Austin, United States
Duration: Oct 5 2014Oct 9 2014

Bibliographical note

Publisher Copyright:
© 2014 The Authors. Published by Elsevier Ltd.

Keywords

  • CO capture
  • Chemical looping combusiton
  • Combustion efficiency
  • Fuel conversion
  • Oxygen carrier

ASJC Scopus subject areas

  • General Energy

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