Performance of iron sand as an oxygen carrier at high reduction degrees and its potential use for chemical looping gasification
Journal article, 2023

Iron sand as an industrial by-product has a reasonable iron content (35 wt% Fe) and low economical cost. The reactivity of iron sand as an oxygen carrier was examined in a bubbling fluidized bed reactor using both gaseous and solid fuels at 850–975 °C. Pre-reductions of iron sand were performed prior to fuel conversion to adapt the less-oxygen-requiring environment in chemical looping gasification (CLG). Based on the investigations using CO and CH4, iron sand has an oxygen transfer capacity of around 1 wt%, which is lower than that of ilmenite. The conversion of pine forest residue char to CO and H2 was higher when using iron sand compared to ilmenite. Depending on the mass conversion degree of iron sand, the activation energy of pine forest residue char conversion using iron sand was between 187 and 234 kJ/mol, which is slightly lower than that of ilmenite. Neither agglomeration nor defluidization of an iron sand bed occurred even at high reduction degrees. These suggests that iron sand can be utilized as an oxygen carrier in CLG. Furthermore, this study presents novel findings in the crystalline phase transformation of iron sand at various degrees of oxidation, altogether with relevant thermodynamic stable phases.

Chemical looping gasification

Thermodynamics

Iron sand

Fluidized bed

High reduction degree

Oxygen carrier

Author

Victor Purnomo

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Ivana Stanicic

Chalmers, Space, Earth and Environment, Energy Technology

Daofeng Mei

Chalmers, Space, Earth and Environment, Energy Technology

Amir H Soleimani Salim

Chalmers, Space, Earth and Environment, Energy Technology

Tobias Mattisson

Chalmers, Space, Earth and Environment, Energy Technology

Magnus Rydén

Chalmers, Space, Earth and Environment, Energy Technology

Henrik Leion

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Fuel

0016-2361 (ISSN)

Vol. 339 127310

Kemcyklisk förgasning för produktion av bioflygbränsle med negativa emissioner

Swedish Energy Agency (51430-1), 2021-01-01 -- 2023-12-31.

Driving Forces

Sustainable development

Subject Categories

Energy Engineering

Chemical Process Engineering

Metallurgy and Metallic Materials

Areas of Advance

Energy

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1016/j.fuel.2022.127310

More information

Latest update

4/11/2023