Numerical investigation of microwave-assisted pyrolysis of lignin
Numerical investigation of microwave-assisted pyrolysis of lignin
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DOI：
10.1016/j.fuproc.2016.10.012
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发表时间：
2017-02-01
影响因子：
7.5
通讯作者：
Gu, Sai
中科院分区：
文献类型：
--
作者：
Gadkari, Siddharth;Fidalgo, Beatriz;Gu, Sai
建立了微波辅助生物质热解过程的三维数学模型。模型中以Kraft木质素为生物质原料，以木质素与炭的混合物为热解样品。结合微波场、传热、传质、达西流体流动等控制方程，建立了考虑气、液、固三种热解产物的集总动力学模型，并进行了瞬态数值分析。给出了微波腔内电场的分布，以及木质素样品内电场、温度和热解产物的分布。预计木质素样品在微波加热时将经历体积加热。相应地，反应区从生物质样品床的中心向外表面延伸。初步评价了该模型对不同参数对木质素微波热解影响的适用性。(C) 2016年作者。Elsevier B.V.出版
A comprehensive three-dimensional mathematical model is developed for studying the microwave-assisted pyrolysis of biomass. Kraft Lignin is considered as biomass feedstock in the model, and a mixture of lignin and char, is used as the sample for pyrolysis. A lumped kinetic model which considers three lumped pyrolysis products (gas, liquid and remaining solid fractions) is coupled with the governing equations for the microwave field, heat transfer, mass transfer, Darcy fluid flow and a transient numerical analysis is performed. The distribution of electric field in the microwave cavity, and the distribution of electric field, temperature, and pyrolysis products within the lignin sample are presented. The lignin sample is predicted to undergo volumetric heating when subjected to microwave heating. Accordingly the reaction zone extends from the center of the biomass sample bed towards the outer surface. Preliminary evaluation of the applicability of the model for assessing the effect of different parameters on the microwave pyrolysis of lignin is also carried out. (C) 2016 The Authors. Published by Elsevier B.V.