Name
Calcium-based chemical looping for biomass torrefaction-gasification enhanced hydrogen production using cage-like CaO hollow microspheres
Description

To address the issue that moisture cannot be fully utilized during the heating stage of biomass, a new concept for biomass utilization is proposed, which involves torrefaction and gasification. During the torrefaction stage, moisture in the biomass is absorbed by CaO; in the sorption-enhanced gasification stage, the released water vapor is used for hydrogen production (Ca(OH)2↔CaO+H2O), thus improving the hydrogen atom utilization rate. Cage-like CaO hollow microspheres with different pore sizes are prepared using a template-assisted synthesis approach and torrefaction-enhanced biomass gasification is investigated through process simulation and experiments. TG-MS experiments of torrefaction and gasification are conducted using a fixed bed to investigate the effects of torrefaction severity on subsequent gasification reactivity and resulting composition changes in pine sawdust. The CaO hollow microspheres exhibit an initial carbonation conversation of 74.1 % and demonstrate significant thermal stability after 50 cycles. The results of CO2-TPD indicate that the strong adsorption of CO2 molecules is promoted, thereby favoring the forward movement of the water-gas shift reaction. TG-DSC analysis and XRD Rietveld refinement testify to the self-heating biomass torrefaction and moisture reuse process in biomass. Consequently, the experimental results show that the unique hollow microsphere structure can significantly reduce the activation energy of carbonation while simultaneously improving hydrogen production, providing a new pathway for the efficient conversion of renewable biomass energy with hydrogen production.

Location Name
Max Bell 251
Full Address
Banff Centre for Arts and Creativity
107 Tunnel Mountain Dr
Banff AB T1L 1H5
Canada
Session Type
Poster
Abstract ID
1129