Biomass gasification for hydrogen rich gas in a decoupled triple bed gasifier with olivine and NiO/olivine
2019
Tursun, Yalkunjan | Xu, Shaoping | Abulikemu, Abulizi | Dilinuer, Talifu
Catalytic steam gasification of biomass has been carried out in decoupled triple bed gasification (DTBG) system which consists of pyrolyzer, reformer and combustor. Olivine and NiO/olivine used as in-situ tar destruction catalyst. The result shows the gasification system with catalytic bed materials allows an option to improve tar removal that enhances H₂ production. A gas yield of 1.59 Nm³/kg daf with H₂ concentration of 56.1 vol% and tar content as low as 0.6 g/Nm³ has been achieved with the presence of NiO/olivine. Olivine and NiO/olivine reduced tar yield by 55% and 94% respectively compared to quartz. Gas yield, tar removal efficiency and water conversion enhanced by higher reformer temperature. The longer residences time of catalyst in reformer leads in-situ reduction of olivine and NiO/olivine that adds up in-situ tar reforming. Particularly, in-situ reduction of NiO to metallic Ni enhances tar and CH₄ reforming reaction.
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