Experimental study on pyrolysis of thermally thick biomass residues samples: Intra-sample temperature distribution and effect of sample weight ('scaling effect')

Michaeel Becidan; Oslash; yvind Skreiberg; Johan E. Hustad

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Experimental study on pyrolysis of thermally thick biomass residues samples: Intra-sample temperature distribution and effect of sample weight ('scaling effect')

机译：热浓生物质残留物样品热解的实验研究：样品内温度分布和样品重量的影响（“结垢效应”）

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摘要

This study on thermally thick biomass residues (brewer spent grain, fibreboard and coffee waste) pyrolysis has been investigating two aspects: temperature history and weight loss characteristics. Significant temperature gradients were measured and will affect the pyrolysis chemistry. Three temperature regimes have been identified: (1) exponentially increasing temperature, (2) linearly increasing temperature and (3) 2-slope increasing temperature with a flattening period. The regime at a given point will depend on the sample weight, the reactor temperature and the location in the sample. The exothermic step of pyrolysis was shown. The comparative study of weight loss curves obtained in a TGA and a macro-TGA shows that pyrolysis rate and duration are affected.

机译：这项对热稠的生物质残留物（啤酒废谷物，纤维板和咖啡废料）热解的研究一直在研究两个方面：温度历史和失重特性。测量了明显的温度梯度，这将影响热解化学反应。已经确定了三种温度状态：（1）呈指数增加的温度；（2）线性增加的温度；（3）带有平坦期的2斜率增加的温度。给定点的状态将取决于样品重量，反应器温度和样品中的位置。显示了热解的放热步骤。在TGA和宏观TGA中获得的减肥曲线的对比研究表明，热解速率和持续时间受到影响。

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来源
《Fuel》 |2007年第18期|p.2754-2760|共7页
作者
Michaeel Becidan; Oslash; yvind Skreiberg; Johan E. Hustad;
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作者单位

NTNU, Department of Energy and Process Engineering, Kolbjø

rn Hejes vei 1 A, 7491 Trondheim, Norway;

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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
中图分类燃料化学工业（总论）;热力工程、热机;
关键词
TGA; biomass pyrolysis; temperature;

机译：TGA;生物质热解;温度;

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1. Products distribution and gas release in pyrolysis of thermally thick biomass residues samples [J] . Michaeel Becidan, Oyvind Skreiberg, Johan E. Hustad Journal of Analytical & Applied Pyrolysis . 2007,第1期

机译：热浓生物质残渣样品热解过程中的产物分布和气体释放
2. The pyrolysis process of wood biomass samples under isothermal experimental conditions-energy density considerations: application of the distributed apparent activation energy model with a mixture of distribution functions [J] . Bojan Jankovi? Cellulose . 2014,第4期

机译：等温实验条件下木材生物质样品的热解过程-能量密度考虑因素：具有分布函数混合的分布表观活化能模型的应用
3. A Degradation Kinetic Study on Pyrolysis of Three Biomass Samples and Co-pyrolysis of Hazelnut Shell and Ultra-high Molecular Weight Polyethylene Blends Using a Silver Indicator [J] . B. Aydinli, A. Caglar Energy sources . 2013,第9a12期

机译：银指示剂对三种生物质样品热解，榛子壳与超高分子量聚乙烯共热分解的动力学研究
4. Low-Temperature Pyrolysis of Woody Biomass in the Thermally Thick Regime [C] . Hayat Bennadji, Krystle Smith, Shaka Shabangu Petroleum Phase Behavior and Fouling International Conference . 2013

机译：热厚的制度中木质生物质的低温热解
5. Development and application of a rapid sampling technique for identification and quantification of compounds in high temperature process gas streams produced from biomass gasification and pyrolysis. [D] . Woolcock, Patrick J. 2013

机译：快速采样技术的开发和应用，用于鉴定和量化生物质气化和热解产生的高温工艺气流中的化合物。
6. Experimental Study on Fluorine Release from Photovoltaic Backsheet Materials Containing PVF and PVDF during Pyrolysis and Incineration in a Technical Lab-Scale Reactor at Various Temperatures [O] . Philipp Danz, Venkat Aryan, Edda Möhle, 2019

机译：技术实验室规模的反应器在不同温度下热解和焚烧过程中从含PVF和PVDF的光伏背板材料中释放氟的实验研究
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。

Experimental study on pyrolysis of thermally thick biomass residues samples: Intra-sample temperature distribution and effect of sample weight ('scaling effect')

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