Gaseous alkali interactions with ilmenite, manganese oxide and calcium manganite under chemical looping combustion conditions
Journal article, 2024

Alkali species present in biomass pose significant challenges in chemical looping combustion (CLC) processes and other thermal conversion applications. The interactions between different alkali species and three common oxygen carrier (OC) materials that are considered to be state of the art in CLC applications have been investigated. A dedicated fluidized bed laboratory reactor was used to study interactions of KCl, NaCl, KOH, NaOH, K2SO4 and Na2SO4 with manganese oxide, calcium manganite and ilmenite. Alkali vapor was generated by injecting alkali salts under reducing, oxidizing and inert conditions at 900 °C. Gaseous species were measured online downstream of the reactor, and the efficiency of alkali uptake was determined under different conditions. The result show significant alkali uptake by all OCs under the studied conditions. Ilmenite shows near complete alkali uptake in reducing conditions, while manganese oxide and calcium manganite exhibited less effective alkali uptake, but have advantages in terms of fuel conversion and oxidizing efficiency. Alkali chlorides, sulfates and hydroxides show distinctly different behavior, with alkali hydroxides being efficiently captured all three investigate OC materials. The findings contribute to a deeper understanding of alkali behavior and offer valuable guidance for the design and optimization of CLC with biomass.

Calcium manganite

Chemical looping combustion

Alkali

Ilmenite

Oxygen carriers

Manganese oxide

Author

Viktor Andersson

University of Gothenburg

Xiangrui Kong

University of Gothenburg

Henrik Leion

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Tobias Mattisson

Chalmers, Space, Earth and Environment, Energy Technology

Jan B. C. Pettersson

University of Gothenburg

Fuel Processing Technology

0378-3820 (ISSN)

Vol. 254 108029

Förbränningskemi för biomassa med syrebärarmaterial

Swedish Research Council (VR) (2016-06023), 2017-01-01 -- 2024-12-31.

Subject Categories

Energy Engineering

Chemical Process Engineering

Other Chemical Engineering

DOI

10.1016/j.fuproc.2023.108029

More information

Latest update

1/23/2024