Sulfur capture and release by ilmenite used as oxygen carrier in biomass combustor
نویسندگان
چکیده
Oxygen-Carrier-Aided Combustion (OCAC) is a promising technology for the combustion of solid heterogeneous fuels such as biomass and waste. However, frequently encountered problem with waste their high alkali contents, which can lead to build-up deposits on heat transfer surfaces, leading corrosion increased maintenance costs. The addition elementary S one options used in processes mitigate corrosion. Sulfation KCl reduces severity surfaces due transformation into K2SO4, considered be less corrosive. Even though many studies have been performed influence sulfur process, there date little knowledge about interaction ilmenite an oxygen carrier (OC). Therefore, need understand both properties OC morphologic development particles. This study investigates interactions between bed material, focus roles ash layers capture release added under different conditions. present focuses material that was exposed Chalmers 12-MWth Circulating Fluidized Bed (CFB) combustor run fuel elemental S. Calcined without elements reference collected samples were tested abilities laboratory fluidized batch reactor at 950 °C. Controlled SO2 exposures oxidizing environment carried out, reversibility mechanisms uptake tested. Understanding components by importance not only handling materials, but also developing new protocols prevention OCAC. In study, ilmenite-sulfur followed using gas analysis, characterization (SEM-EDX), thermodynamic calculations (FactSage). results suggest captured oxidative conditions, preferentially materials developed layers, released reducing Mixed-sulfate-phase K2Ca2(SO4)3, K2SO4 CaSO4 are found main formed phases participate release.
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ژورنال
عنوان ژورنال: Fuel
سال: 2022
ISSN: ['0016-2361', '1873-7153']
DOI: https://doi.org/10.1016/j.fuel.2021.121978