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Lowering Gasifier Tars and Particulates Using Heated Dololmite Catalyst and a Particulate Filter

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Author(s): Chandra S. Theegala | Beatrice G. Terigar | Christopher O. Akudo

Journal: Advances in Molecular Imaging
ISSN 2161-6728

Volume: 03;
Issue: 01;
Start page: 56;
Date: 2012;
Original page

Keywords: Gasification | Dolomite | Tars | Particulates | Syngas

ABSTRACT
For this study, a fixed-bed, down-draft gasifier was designed to investigate the effect of a dolomite catalytic bedon tar removal. Pine pellets and wood chips (cypress) were used to produce syngas from the down-draft gasifier. For the gas conditioning, a combination of a heated dolomite (bed temperature at 850?C for catalytic cracking of tars) and a parti-culate filter (for particulate removal) was used. Investigation of temperature effects on dolomite activity between 650?C and 950?C bed temperatures, showed optimum catalytic efficiency at approximately 850?C. At the optimum conditions, gravimetric tar and particulate concentrations in syngas produced from pine pellets were 0.85 g/Nm3 (±0.16) and 4.75 g/Nm3 (±0.07), respectively before gas conditioning, and 0.09 g/Nm3 (±0.02) and 2.01 g/Nm3 (±0.13), respec-tively after gas conditioning. Syngas from wood chips contained 1.63 g/Nm3 (±0.45) and 3.84 g/Nm3 (±1.16) of tars and particulates, respectively before gas cleaning and 0.19 g/Nm3 (±0.02) and 2.27 g/Nm3 (±0.27) tars and particulates, respectively after gas conditioning. The combustible portion of the gas constituted carbon monoxide (12% - 14%), hy-drogen (11% - 12%), and methane (~2%). These results suggest that syngas produced from gasification of pine pellets and wood chips in a down-draft biomass gasifier can be effectively cleaned using a heated catalyst bed and a particu-late filter. However, the benefits of gas conditioning will be offset by the need to maintain a heated catalyst bed for tar cracking.
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