TAR/CH_4 REFORMING BY CATALYTIC BED MATERIALS IN A BIOMASS FLUIDISED BED GASIFIER

摘要

A study on in-bed catalytic material reforming of tar/methane (CH_4) has been performed in the 150 kWallothermal biomass gasifier at Mid Sweden University (MIUN). The MIUN gasifier, built for research on syntheticfuel production, is a dual fluidised bed gasifier (DFBG). The syngas for automotive fuels synthesis has a strictspecification of impurities. The biggest challenge for biomass fluidised-bed gasification is the reforming of tars andCH_4. Internal reforming should be considered before downstream reforming. The MIUN gasifier has a unique designsuitable for in-bed tar/CH_4 catalytic reforming and continuously internal regeneration of the reactive bed material.The experimental tests are carried out in three cases: 1) basic condition with silica sand (no catalytic activity), 2)calcinated olivine, and 3) Fe-impregnated olivine (10%wtFe/Olivine Catalyst). The measurement results have beenevaluated by comparing tar/CH_4 content in the syngas from the gasifier operated under different operation conditions.These results in BFB mode have initiated the ongoing investigations of the catalytic effects and regeneration in DFBmode. It can be concluded that the Fe-impregnated olivine showed a surprising low reactivity for tar and CH_4reforming in the BFB model