Numerical analysis of wood biomass packing factor in a fixed-bed gasification process

Gonzalez William A.; Perez Juan F.; Chapela Sergio; Porteiro Jacobo

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Numerical analysis of wood biomass packing factor in a fixed-bed gasification process

机译：固定床气化过程中木材生物量填充因子的数值分析

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The biomass gasification process in fixed bed was studied by means of computational fluid dynamics (CFD) numerical analysis. The aim was to evaluate the effect of the biomass packing factor on the thermochemical process. The fuel-wood used was Jacaranda Copaia in various shapes: chips, cylinders, and cubes with packing factors (PF) of 0.38, 0.48, and 0.59, respectively. The mathematical model is a transient 2D CFD model, which was developed through the implementation of User Defined Functions in ANSYS-Fluent. The model was extended to simulate the gasification process by expanding the chemical kinetic mechanism and by adapting the stages of pyrolysis, oxidation, and reduction. The model was validated with experimental data. The average relative error between experimental and numerical data was 5.45%. By means of the sensitivity analysis, it was found that with an increase in the packing factor from 0.38 to 0.59, the absorption of radiative heat transfer increases by 27% leading to increase the solid temperature in the reaction front, but due to a lower penetration of radiation, the drying and pyrolysis reaction rates decrease. But nevertheless, the higher solid temperature with packing factor favors the convective solid-gas heat transfer in the drying stage. (C) 2018 Elsevier Ltd. All rights reserved.

机译：通过计算流体动力学（CFD）数值分析研究了固定床中的生物质气化过程。目的是评估生物质填充因子对热化学过程的影响。所用的薪材为Jacaranda Copaia，其形状各异：木片，圆柱体和立方体，其包装系数（PF）分别为0.38、0.48和0.59。数学模型是一个瞬态2D CFD模型，它是通过在ANSYS-Fluent中实现用户定义函数而开发的。通过扩展化学动力学机理并适应热解，氧化和还原的阶段，扩展了该模型以模拟气化过程。该模型已通过实验数据验证。实验数据和数值数据之间的平均相对误差为5.45％。通过灵敏度分析发现，随着堆积系数从0.38到0.59的增加，辐射换热的吸收增加27％，导致反应前沿的固体温度升高，但由于渗透率较低辐射，干燥和热解反应速率降低。但是，尽管如此，较高的固相温度和堆积因子有利于干燥阶段中对流固-气的传热。（C）2018 Elsevier Ltd.保留所有权利。

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来源
《Renewable energy》 |2018年第6期|579-589|共11页
作者
Gonzalez William A.; Perez Juan F.; Chapela Sergio; Porteiro Jacobo;
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作者单位

Univ Antioquia, Fac Ingn, Dep Ingn Mecan, Grp Manejo Eficiente Energia GIMEL, Calle 67 53-108, Medellin, Colombia;

Univ Antioquia, Fac Ingn, Dep Ingn Mecan, Grp Manejo Eficiente Energia GIMEL, Calle 67 53-108, Medellin, Colombia;

Univ Vigo, ETS Ingenieros Ind, Rua Maxwell S-N,Campus Lagoas Marcosende, Vigo 36310, Pontevedra, Spain;

Univ Vigo, ETS Ingenieros Ind, Rua Maxwell S-N,Campus Lagoas Marcosende, Vigo 36310, Pontevedra, Spain;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Biomass; Packing factor; Fixed bed gasification; CFD; Numerical analysis; Heat transfer;

机译：生物质;装填系数;固定床气化;CFD;数值分析;传热;

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1. Characterization of Inorganic Elements in Woody Biomass Bottom Ash from a Fixed-bed Combustion System, a Downdraft Gasifier and a Wood Pellet Burner by Fractionation [J] . Adrian. K. James, Steve S. Helle, Ronald W. Thring, Energy and Environment Research . 2014,第1期

机译：固定床燃烧系统，向下气流气化炉和木质颗粒燃烧器分馏对木质生物质底灰中无机元素的表征
2. Characterization of Inorganic Elements in Woody Biomass Bottom Ash from a Fixed-bed Combustion System, a Downdraft Gasifier and a Wood Pellet Burner by Fractionation [J] . Adrian. K. James, Steve S. Helle, Ronald W. Thring, Energy and Environment Research . 2014,第1期

机译：固定床燃烧系统，向下气流气化炉和木质颗粒燃烧器分馏对木质生物质底灰中无机元素的表征
3. Characterization of Inorganic Elements in Woody Biomass Bottom Ash from a Fixed-bed Combustion System, a Downdraft Gasifier and a Wood Pellet Burner by Fractionation [J] . Adrian. K. James, Steve S. Helle, Ronald W. Thring, Energy and Environment Research . 2014,第1期

机译：固定床燃烧系统，向下气流气化炉和木质颗粒燃烧器分馏对木质生物质底灰中无机元素的表征
4. MATHEMATICAL MODELLING OF THE FIXED-BED BIOMASS-COAL CO-GASIFICATION PROCESS [C] . Igor G. Donskoy Heat and Mass Transfer in the System of Thermal Modes of Energy - Technical and Technological Equipment . 2016

机译：固定床生物质 - 煤共气过程的数学建模
5. Modeling of Biomass Gasification: Comparison with Semi-Industrial Gasifier and In Depth Analysis on Process Difficulties [D] . Couto, Nuno Tiago Dinis 2017

机译：生物质气化的建模：与半工业气化炉的比较以及工艺难度的深度分析
6. Analysis of ecotoxic influence of waste from the biomass gasification process [O] . Małgorzata Hawrot-Paw, Adam Koniuszy, Małgorzata Mikiciuk, -1

机译：生物质气化过程中废物的生态毒性影响分析
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。
8. Development of Novel Fixed-Bed Gasification for Biomass Residues and Agrobiofuels. [R] . Kurkela, E., Simell, P., Staehlberg, P. 2000

机译：新型生物质残渣和农杆菌固定床气化的研究进展。

Numerical analysis of wood biomass packing factor in a fixed-bed gasification process

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