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 language | English |
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Pages (from-to) | 73-79 |
Number of pages | 7 |
Journal | Energy Procedia |
Volume | 63 |
DOIs | |
State | Published - 2014 |
Event | 12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014 - Austin, United States Duration: Oct 5 2014 → Oct 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