Reduction of Physical Effects during Reactivity Tests in Fluidized Bed

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• 作者：Alberto Gó ; mez-Barea ; Bo Leckner ; Pedro Ollero ; Custodia Fern&aacute ; ndez-Baco ; Luis Salvador
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：October 11, 2006
• 年：2006
• 卷：45
• 期：21
• 页码：7344 - 7350
• 全文大小：193K
• 年卷期：v.45,no.21(October 11, 2006)
• ISSN：1520-5045

文摘

The role of transport effects in experiments on the gasification reactivity of biomass char, conducted in a26-mm-diameter bench-scale fluidized bed (FB) reactor, is analyzed. Gasification rates of char were measuredat various particle sizes, CO₂ partial pressures, temperatures, and initial char batches. A dedicated methodologyenables evaluation of the transport effects from gas measurements. The separate contributions of fluid-dynamics,external film, and porous diffusional resistances in a typical FB char gasification test are addressed. An optimaladjustment of the operating conditions of the FB is proposed to reduce mass-transport effects as much aspossible. When transport effects cannot be completely eliminated, this work shows how to treat the data toobtain an average reactivity that is useful for reactor simulations.