BIOMASS GASIFICATION KINETICS: INFLUENCES OF PRESSURE AND CHAR STRUCTURE

E. CETIN; B. MOGHTADERI; R. GUPTA; T.F. WALL

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BIOMASS GASIFICATION KINETICS: INFLUENCES OF PRESSURE AND CHAR STRUCTURE

机译：生物质气化动力学：压力和炭结构的影响

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In this study, the gasification kinetics of chars from different biomass species have been investigated within the temperature range 800-950℃, CO_2 concentrations of 10 to 100% v/v, and pressures between 1 and 20 bar using thermogravimetric analysis (TGA). The quartz wool matrix (QWM) method was used to simulate circulating fluidized-bed (CFB) conditions. The reactivity results obtained by the QWM method were compared with those extracted using TGA data. Kinetic data from TGA analyses was found to be compatible for predicting CFB gasification reactivity. Effects of pyrolysis pressure on the chemical structure of char and char conversion reactivities were also investigated. Pressure has been found to have no effect on reactivity during char conversion while having a dramatic effect on chemical and physical structure during the pyrolysis process. The Langmuir-Hinshelwood rate equation represents the pressurized radiata pine char gasification kinetics well. The Langmuir-Hinshelwood expression for studied conditions can be described as R_(CO_2)=(1,22.10~4e~((-163.10~3)/(RT))P_(CO_2))/(1+(5,84.10~(-11))e~((246.10~3)/(RT))P_(CO)(6,48.10~(-4))e~((56.10~3)/(RT))P_(CO_2))Kinetic data found in this study are in good agreement with the literature.

机译：在这项研究中，使用热重分析（TGA）在800-950℃的温度范围，10％至100％v / v的CO_2浓度和1至20 bar的压力下研究了来自不同生物质的焦炭的气化动力学。石英棉基质（QWM）方法用于模拟循环流化床（CFB）条件。将通过QWM方法获得的反应性结果与使用TGA数据提取的结果进行比较。发现来自TGA分析的动力学数据可用于预测CFB气化反应性。还研究了热解压力对焦炭化学结构和焦炭转化反应性的影响。已经发现压力对焦炭转化过程中的反应性没有影响，而对热解过程中的化学和物理结构有显着影响。 Langmuir-Hinshelwood速率方程很好地表示了加压辐射松木炭的气化动力学。研究条件下的Langmuir-Hinshelwood表达式可表示为R_（CO_2）=（1,22.10〜4e〜（（-163.10〜3）/（RT））P_（CO_2））/（1+（5,84.10〜（-11））e〜（（246.10〜3）/（RT））P_（CO）（6,48.10〜（-4））e〜（（56.10〜3）/（RT））P_（CO_2））在这项研究中发现的动力学数据与文献非常吻合。

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来源
《Combustion Science and Technology》 |2005年第4期|p.765-791|共27页
作者
E. CETIN; B. MOGHTADERI; R. GUPTA; T.F. WALL;
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作者单位

Discipline of Chemical Engineering, School of Engineering, Faculty of Engineering and Built Environment, The University of Newcastle, New South Wales, Australia;

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原文格式 PDF
正文语种 eng
中图分类热力工程、热机;
关键词
biomass gasification; gasification kinetics; pressurized gasification;

机译：生物质气化气化动力学加压气化;

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1. Co-gasification of coal-biomass blended char with CO2 and H2O: Effect of partial pressure of the gasifying agent on reaction kinetics [J] . Farid Massoud Massoudi, Jeong Hyo Jae, Hwang Jungho Fuel . 2015,第DECa15期

机译：煤-生物质混合炭与CO2和H2O的共气化：气化剂分压对反应动力学的影响
2. The role of gasification reactions during pulverized solid fuel combustion: A detailed char combustion model based on measurements of char structure and kinetics for coal and pre-treated biomass [J] . Kleinhans Ulrich, Halama Stefan, Spliethoff Hartmut Combustion and Flame . 2017,第OCTa期

机译：气化反应在粉状固体燃料燃烧中的作用：基于煤和预处理生物质的炭结构和动力学测量的详细炭燃烧模型
3. Comparison of kinetic models for isothermal CO2 gasification of coal char-biomass char blended char [J] . Zuo Hai-bin, Geng Wei-wei, Zhang Jian-liang, International Journal of Minerals,Metallurgy and Materials . 2015,第4期

机译：煤焦-生物质炭混合炭等温CO2气化动力学模型比较
4. BIOMASS CHAR GASIFICATION: STUDY ON REACTION KINETICS USING A HIGH-PRESSURE THERMOGRAVIMETRIC ANALYZER [C] . Andreas Mueller, Philipp Stoesser, Thomas Kolb Clearwater clean coal conference;International technical conference on clean coal fuel systems . 2014

机译：生物质炭气化：高压热重分析仪的反应动力学研究
5. STEREOLOGICAL ANALYSIS OF THE MACROPORE STRUCTURE OF CHARS PRODUCED UNDER VARIOUS PYROLYSIS CONDITIONS AND THE INFLUENCE OF MACROPORE STRUCTURE ON CHAR GASIFICATION RATES IN THE PRESENCE OF STRONG DIFFUSIONAL LIMITATIONS. [D] . GLASS, MICHEAL WALTER. 1987

机译：各种热解条件下生成的炭的宏观结构的体学分析以及在强扩散限制下宏观结构对炭化率的影响。
6. Valorization of Char From Biomass Gasification as Catalyst Support in Dry Reforming of Methane [O] . Vittoria Benedetti, Snehesh Shivananda Ail, Francesco Patuzzi, 1970

机译：生物质气化中焦炭的重整作为甲烷干重整中的催化剂载体
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。

BIOMASS GASIFICATION KINETICS: INFLUENCES OF PRESSURE AND CHAR STRUCTURE

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