Kinetic characterizations of biomass char CO2-gasification reaction within granulated blast furnace slag

• Published in: International journal of hydrogen energy Vol. 42; no. 32; pp. 20520 - 20528
• Main Authors: Yao, Xin, Yu, Qingbo, Wang, Kuiming, Xie, Huaqing, Qin, Qin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 10.08.2017
• Subjects: Biomass; Blast furnace slag; Gasification; Kinetic; Mechanism model; Mechanism model; Gasification; Biomass; Kinetic; Blast furnace slag
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2017.06.160

The reactions of biomass char CO2-gasification within granulated blast furnace slag (BFS) were systematically conducted by the non-isothermal program using a thermogravimetric analyzer. At the same time during reaction proceeded, the conversion of biomass char CO2-gasification reaction increased with the increasing heating rate. However, at the same temperature during reaction proceeded, the conversion of biomass char CO2-gasification reaction decreased with the increasing heating rate. The granulated BFS could be used as a catalyst in the biomass char CO2-gasification reaction and its catalytic effect became more obvious with the increasing content of BFS in the mixture. The A4 model (nuclei production (m = 4) model) selected through the novel two-step method firstly proposed in the study was the best match with all the gasification reactions. The activation energy was from 52.75 kJ/mol to 64.42 kJ/mol and was lower with the increase of heating rate and the content of BFS in the mixture. The kinetic equations of biomass char CO2-gasification reaction within granulated BFS were developed through the selected model and calculated kinetic parameters. •Using biomass CO2-gasification to recover heat from granulated blast furnace slag was proposed.•The effects of heating rate and blast furnace slag on the biomass char CO2-gasification reaction were investigated.•The novel two-step method firstly used to obtain kinetic parameters.•The kinetic equations of biomass char CO2-gasification reaction within granulated BFS were established.