A novel approach to simulating biomass pyrolysis in a fluidized bed of mostly inert material is presented. The bed is assumed to be externally heated, although simulation of autothermal operation with partial oxidation of the products is a future objective. Combining pyrolysis reaction kinetics developed by the CRECK Modeling Group and a previously published component properties model, material and energy balances are closed by tracking the residence time of biomass particles without regard for their exact spatial distribution. The model is used to simulate a pilot-scale fluidized bed pyrolysis process being developed at Iowa State University, and model predictions are compared with experimental results for red oak and corn stover feedstocks. The results are in general agreement, with the model typically predicting more noncondensable gas and less low-boiling liquid products. The differences are ascribed to the limitations of the kinetics model. This model provides a rigorous energy balance for fluidized bed pyrolysis processes that can be incorporated into commercial flowsheet models with the capacity for future addition of partial oxidation reactions and implementation of improved kinetics models.

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在流化床反应器中模拟生物质热解的新方法

提出了一种模拟大多数惰性材料流化床中生物质热解的新颖方法。尽管模拟产品部分氧化的自热操作是未来的目标，但假定该床是外部加热的。结合CRECK建模小组开发的热解反应动力学和先前发布的组件特性模型，可以通过跟踪生物质颗粒的停留时间来封闭材料和能量平衡，而无需考虑其确切的空间分布。该模型用于模拟爱荷华州立大学正在开发的中试规模的流化床热解过程，并将模型预测与赤栎和玉米秸秆原料的实验结果进行比较。结果基本一致，该模型通常会预测更多的不凝性气体和较少的低沸点液体产物。差异归因于动力学模型的局限性。该模型为流化床热解过程提供了严格的能量平衡，可以将其纳入商业流程图模型，并具有将来添加部分氧化反应和实施改进的动力学模型的能力。