Journal
ENERGY
Volume 241, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.122927
Keywords
Chemical looping gasification; Solid waste; Phosphogypsum; Steel slag; Hydrogen-enriched syngas
Categories
Funding
- National Natural Science Foundation of China [21666016]
- National Key R&D Program of China [2018YFC1900200]
- open foundation of State Key Laboratory of High-efficiency Utili-zation of Coal and Green Chemical Engineering [2021-K39]
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Using phosphogypsum and steel slag to prepare OCs for chemical looping gasification can improve waste utilization rate, reduce costs, and produce hydrogen-enriched syngas. Results show that steel slag effectively enhances the performance of phosphogypsum-based OCs.
Chemical looping gasification (CLG) is a clean and efficient carbon energy conversion pathway using oxygen carriers (OCs). Industrial solid wastes, such as phosphogypsum (PG) and steel slag (SS), used as practical resources to prepare OCs, have been proven to be a promising strategy. Single industrial waste has been used for OCs preparation; however, two or more types of waste have not been used for OCs preparation. In this work, PG and SS were used to prepare OCs for hydrogen-enriched syngas production through CLG technology. The prepared OCs by PG and SS increase the solid waste utilization rate and significantly reduce preparation costs. Further, the reaction process and the effects of reaction conditions were studied based on the FactSage calculation and verified in fixed bed experiments. The results show that SS effectively improved PG-OCs performance. Moreover, the most economic optimal conditions for producing hydrogen-enriched syngas (found to be 72.51%) were determined as a reaction temperature of around 1023 K, lignite/OCs mass ratio of 1, 50 wt% -67 wt% of SS/OCs mass ratio, and water vapor/OCs mass ratio of 0.6. In conclusion, SS-PG OCs are the new era for hydrogen-enriched syngas production in CLG. (c) 2021 Elsevier Ltd. All rights reserved.
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