Bed material as a catalyst for char gasification: The case of ash-coated olivine activated by K and S addition

FUEL

卷:224

Article

Vilches, Teresa Berdugo¹  Maric, Jelena¹  Knutsson, Pavleta¹  Rosenfeld, Daniel C.¹  Thunman, Henrik¹  Seemann, Martin¹ 

[1] Chalmers Univ Technol, Div Energy Technol, Dept Space Earth & Environm SEE, S-41296 Gothenburg, Sweden

关键词: Char;    Olivine;    Potassium;    Sulfur;    Catalytic gasification;    Ash-layer;    Fluidized bed;   

DOI  :  10.1016/j.fuel.2018.03.079

来源: Elsevier

【 摘 要 】

In this paper, the ability of an ash-coated olivine to catalyze the steam gasification of biomass-derived char is investigated in a laboratory reactor. The olivine investigated is a sample from the Chalmers dual fluidized bed gasifier and it has been activated by the in-bed addition of S and K2CO3. The char and bed material samples were analyzed by Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy (SEM-EDS). It is shown that the ash layer coating of the olivine can catalyze the steam gasification of char by transferring catalytic potassium (K) to the char particles. The mobilities of the catalytic species from the olivine ash-layer are discussed. This work furthers the current understanding of the catalytic activities of ash-coated bed material particles during the thermochemical conversion of carbonaceous feedstocks in fluidized beds. In addition, it complements the existing literature on catalytic bed materials, which to date have focused on tar removal and improving gas quality.

【 授权许可】

Free