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[摘要]：In. thermochemical biomass conversion processes, especially gasification, the tar content, and composition is a major subject. Because (of the various processes examined at VUT, this work picks tip the opportunity to compare the different tar amounts and its composition at different temperatures and process parameters. Gasification of biomass was carried out at The 100-kW steam-blown dual fluidized bed gasifier pilot plant III (800-870 degrees C) and The 70-kW air-blown pressurized research unit (800-900 degrees C,- 1-5 bar) at VUT. Olivine is a catalyst for tar conversion: hence it was used as bed material in steam gasification and also in pressurized air gasification. For better understanding of tar formation during thermochemical conversion of biomass, the tar content and composition in the producer gas were analyzed with a gas chromatograph coupled with a mass spectrometer. Basic differences between the two thermochemical conversion processes occurred especially at higher temperatures or higher pressures. The tar composition was shifted to higher molecular tars such as polyaromatic hydrocarbons. Decreasing tar amounts were found at higher temperatures or higher pressures. Therefore, in future, an optimization of gasification processes should be easier to accomplish, which means lower tar content in the producer gas, which results in a better utilization of the biomass. (C) 2009 American Institute of Chemical Engineers Environ Prog, 28: 372-379,2009 |
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