Technologies and mathematical models involving iron oxide for industrial decarbonisation
File(s)
Author(s)
Wong, Jasper
Type
Thesis
Abstract
This thesis develops new models and technology for industrial decarbonisation, demanded by climate change. The work focuses on gas-solid processes and reactions in the spheres of both next generation carbon capture technologies and clean iron and steelmaking. In particular, the gaseous reduction of iron oxide, a key ingredient for much of the world’s infrastructure and an important metal oxide for clean fuel conversion in chemical looping. New technology concepts, mathematical models and methods have been developed alongside experimental evidence in gas-solid reactors. A new three-interface random pore model is derived and applied to the gaseous reduction of hematite (Fe2O3) to iron (Fe). A new chemical looping process for the decarbonised production of direct reduced iron has been developed. The three-stage process co-produces iron, pure CO2 (suitable for storage) and nitrogen in three moving bed reactors. A generalised random pore model, including both gaseous diffusion and solid-state diffusion in the product layer was developed, and was successfully applied to the reduction of hematite to magnetite by CO.
Version
Open Access
Date Issued
2024-09-25
Date Awarded
01/05/2025
License URL
Advisor
Fennell, Paul
Shah, Nilay
Publisher Department
Department of Chemical Engineering
Publisher Institution
Imperial College London
Qualification Level
Doctoral
Qualification Name
Doctor of Philosophy (PhD)