Multi-Scale Modelling of Biomass Pyrolysis Processes

机译：生物质热解过程的多尺度建模

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Thermo-chemical decomposition of biomass to bio-energy via pyrolysis is a complex process. Several pyrolysis models have been proposed for predicting the yields of desired components as a function of operating conditions. These models, however, have not considered the overall effect of process parameters and hence, are not capable of accurately predicting product yields with variation in operating conditions. Consequently, there is requirement for developing comprehensive multi-scale models for studying the combined impact of various parameters during biomass conversion. In this study, a detailed particle scale model has been developed by coupling two-stage reaction mechanism with transport phenomena to account for the combined impact of different parameters on the conversion process. Simulations have been conducted for validating this model and analysing the effect of operating temperature and particle size variation on the biomass conversion time. Based on results, it has been concluded that both particle size and operating temperature affects the rate of biomass decomposition and it is required to optimally choose these parameters with other operating conditions for getting complete conversion of biomass. ;Biomass; Tar; Kinetics; Modelling; Pyrolysis

机译：通过热解将生物质热化学分解为生物能是一个复杂的过程。已经提出了几种热解模型，用于预测所需组分的收率与操作条件的关系。但是，这些模型并未考虑工艺参数的整体影响，因此无法根据操作条件的变化准确地预测产品的产量。因此，需要开发综合的多尺度模型来研究生物质转化过程中各种参数的综合影响。在这项研究中，通过将两阶段反应机理与传输现象耦合，以解决不同参数对转化过程的综合影响，已开发出了详细的颗粒模型。已经进行了仿真以验证该模型并分析了操作温度和粒度变化对生物质转化时间的影响。基于结果，可以得出结论，颗粒大小和操作温度都影响生物质的分解速率，因此需要在其他操作条件下最佳选择这些参数，以实现生物质的完全转化。 ;生物质;柏油;动力学;造型;热解

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《European symposium on computer aided process engineering;ESCAPE 22》|2012年|p.1133-1137|共5页
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Abhishek Sharma; Vishnu Pareek; Dongke Zhang;
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中图分类信息处理（信息加工）;信息处理（信息加工）;
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3. Modeling chemical and physical processes of wood and biomass pyrolysis [J] . Colomba Di Blasi Progress in Energy and Combustion Science . 2008,第1期

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4. Multi-Scale Modelling of Biomass Pyrolysis Processes [C] . Abhishek Sharma, Vishnu Pareek, Dongke Zhang European Symposium on Computer Aided Process Engineering . 2012

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5. Multi-Scale Modeling of Biomass Pyrolysis - Macro and Meso - Scale Modeling [D] . Adenson, Michael O. 2017

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6. Fabrication of Biomass-Derived Carbon Aerogels with High Adsorption of Oils and Organic Solvents: Effect of Hydrothermal and Post-Pyrolysis Processes [O] . Aishu Yin, Feng Xu, Xueming Zhang 2016

机译：油脂和有机溶剂的高吸附性的生物质碳气凝胶的制备：水热和热解过程的影响
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。

Multi-Scale Modelling of Biomass Pyrolysis Processes

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