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Modeling the impact of bubbling bed hydrodynamics on tar yield and its fluctuations during biomass fast pyrolysis

机译：模拟鼓泡床流体动力学对焦油收率及其在生物质快速热解过程中波动的影响

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摘要

The impact of bubbling bed hydrodynamics on temporal variations in the exit tar yield for biomass fast pyrolysis was investigated using computational simulations of an experimental laboratory-scale reactor. A multi-fluid computational fluid dynamics model was employed to simulate the differential conservation equations in the reactor, and this was combined with a multi-component, multi-step pyrolysis kinetics scheme for biomass to account for chemical reactions. The predicted mean tar yields at the reactor exit appear to match corresponding experimental observations. Parametric studies predicted that increasing the fluidization velocity should improve the mean tar yield but increase its temporal variations. Increases in the mean tar yield coincide with reducing the diameter of sand particles or increasing the initial sand bed height. However, trends in tar yield variability are more complex than the trends in mean yield. The standard deviation in tar yield reaches a maximum with changes in sand particle size. The standard deviation in tar yield increases with the increases in initial bed height in freely bubbling state, while reaches a maximum in slugging state. (C) 2015 Elsevier Ltd. All rights reserved.
机译：鼓泡床流体动力学对生物质快速热解出口焦油产率随时间变化的影响，使用实验规模的反应器的计算模拟进行了研究。采用多流体计算流体动力学模型来模拟反应器中的守恒方程，并与生物质的多组分，多步骤热解动力学方案相结合，以解决化学反应。反应器出口的预计平均焦油收率似乎与相应的实验观察结果相匹配。参数研究预测，提高流化速度应可提高平均焦油收率，但会增加其瞬时变化。平均焦油产率的增加与减小砂粒的直径或增加初始砂床高度相吻合。但是，焦油收率变异性的趋势比平均收率的趋势更为复杂。随着砂粒尺寸的变化，焦油产率的标准偏差达到最大。在自由起泡状态下，焦油收率的标准偏差随初始床层高度的增加而增加，而在击打状态下则达到最大值。 （C）2015 Elsevier Ltd.保留所有权利。

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