Linear equations on thermal degradation products of wood chips in alkaline glycerol

Ayhan Demirbas

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Linear equations on thermal degradation products of wood chips in alkaline glycerol

机译：木片在碱性甘油中热降解产物的线性方程

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Wood chips of 0.3 and 2 mm depth from poplar and spruce wood samples, respectively, were degraded by using glycerol as a solvent and alkaline glycerol with and without Na_2CO_3 and NaOH catalysts at different degradation temperatures: 440, 450, 460, 470, 480, 490 and 500 K. By products from the degradation processes of the lignocelluloses include lignin degradation products. Lignin and its degradation products have fuel values. The total degradation degree and cellulose degradation of the wood chips were determined to find the relationship, if any, between the yields of total degradation degree (YTD) and degradation temperature (T). There is a good linear relationship between YTD or the yields of cellulose degradation (YCD) and T (K). For the wood samples, the regression equations from NaOH (10%) catalytic runs for 0.3 mm x 15 mm x 15 mm chip size are: For poplar wood: YTD = 0.7250T - 267.507 (a) YCD = 0.1736T-71.707 (b) For spruce wood: YTD = 0.2650T - 105.979 (c) YCD = 0.0707T - 27.507 (d) For Eqs. (a), (b), (c) and (d), the square of the correlation coefficient (r~2) were 0.9841, 0.9496, 0.9839 and 0.9447, respectively.

机译：在不同的降解温度下，分别使用甘油作为溶剂以及使用和不使用Na_2CO_3和NaOH催化剂的碱性甘油，分别降解杨木和云杉木材样品中深度分别为0.3和2 mm的木片，分别为440、450、460、470、480， 490和500K。来自木质纤维素降解过程的副产物包括木质素降解产物。木质素及其降解产物具有燃料价值。确定木屑的总降解度和纤维素降解，以发现总降解度（YTD）的产率和降解温度（T）之间的关系（如果有）。 YTD或纤维素降解量（YCD）和T（K）之间存在良好的线性关系。对于木材样品，对于0.3 mm x 15 mm x 15 mm切屑尺寸，NaOH（10％）催化运行的回归方程为：对于杨木：YTD = 0.7250T-267.507（a）YCD = 0.1736T-71.707（b ）对于云杉木材：YTD = 0.2650T-105.979（c）YCD = 0.0707T-27.507（d）对于等式（a），（b），（c）和（d），相关系数的平方（r〜2）分别为0.9841、0.9496、0.9839和0.9447。

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《Energy Conversion & Management》 |2004年第8期|p.983-994|共12页
作者
Ayhan Demirbas;
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作者单位

Selcuk University, Department of Chemical Engineering, Konya, Turkey;

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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
中图分类能源与动力工程;
关键词
thermal degradation; poplar wood; spruce wood; cellulose degradation; glycerol; alkali;

机译：热降解;杨木;云杉木;纤维素降解;甘油;碱;

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专利

1. Mathematical modeling on thermal degradation of wood chips using glycerol and alkaline glycerol [J] . Demirbas A Energy Sources . 2004,第12期

机译：利用甘油和碱性甘油对木片进行热降解的数学模型
2. Degradation of poplar and spruce wood chips using alkaline glycerol [J] . Demirbas A, Celik A Energy Sources . 2005,第11期

机译：用碱性甘油降解杨木和云杉木片
3. Mechanisms of Thermal Degradation of Wood in Alkaline Glycerol [J] . A. DEMIRBAS Energy Sources . 2009,第13a16期

机译：木材在甘油中热降解的机理
4. Fungal Degradation of Wood Plastic Composites Made with Thermally Modified Wood Residues [C] . Edgars Kuka, Dace Cirule, Janis Kajaks International Baltic Conference of Engineering Materials and Tribology . 2017

机译：用热改性木材残留物制造木塑复合材料的真菌降解
5. Studies on biological kraft pulping of compression-baled wood chips with lignin-degrading fungi. [D] . Chen, Yi-ru. 1998

机译：木质素降解真菌压捆木片的生物牛皮纸制浆研究。
6. Combustion Behavior and Thermal Degradation Propertiesof Wood Impregnated with Intumescent Biomass Flame Retardants: PhyticAcid Hydrolyzed Collagen and Glycerol [O] . Luming Li, Zhilin Chen, Jinhan Lu, 2021

机译：燃烧行为和热降解性能浸渍膨胀膨胀型生物量阻燃剂的木材：植物酸水解胶原和甘油
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. Wood Products:Thermal Degradation and Fire. [R] . Dietenberger, M. A., Hasburgh, L. E. 2016

机译：木制品：热降解和火灾。

Linear equations on thermal degradation products of wood chips in alkaline glycerol

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