Cellulose, hemicellulose and lignin slow steam pyrolysis: Thermal decomposition of biomass components mixtures
Cellulose, hemicellulose and lignin slow steam pyrolysis: Thermal decomposition of biomass components mixtures
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DOI：
10.1016/j.jaap.2012.12.026
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发表时间：
2013-03-01
影响因子：
6
通讯作者：
Ragucci, Raffaele
中科院分区：
文献类型：
--
作者：
Giudicianni, Paola;Cardone, Giuseppe;Ragucci, Raffaele
生物质热化学分解产物作为化石燃料的可再生替代品已得到广泛研究。在这项工作中提出的方法认为植物废物作为能源和物质的来源，通过生产气相燃料，高度稀释在蒸汽中，适合于在非常规燃烧系统中燃烧，并具有土壤改良和土壤改良性能的焦炭。为了证明这种方法的可行性，设计了一个实验装置，旨在研究压力的影响，升温速率和终温在适当的变化范围内（P = 1-5 × 10 ~（5）Pa，HR = 5-40 K/min，T=473-973 K）对产率和气、固产物的理化性质的影响。本文研究了常压（P= 5 × 10 ~（5）Pa）和升温速率（HR = 5 K/min）下的温度效应，以探索从焙烧到温和气化再到脱挥发分的热化学降解的各个阶段。对于真实的生物质，需要对生物质组分的表征进行基础研究，了解生物质组分与原料性质和工艺条件的依赖关系，对于理解真实的复杂生物质蒸汽热解过程中发生的现象和优化工艺操作参数至关重要。该研究表征了三种单一生物质组分（纤维素、半纤维素和木质素）和三种二元混合物在高达873 K（压力P= 5 × 10（5）Pa和加热速率HR = 5 K/min）下的蒸汽热解，以评估生物质组分之间可能的相互作用。得到的结果突出了组分之间的相互作用，主要是纤维素和木质素，固体和气体产品的产量和特性的重要性。特别是，已检测到固体产品的比表面积上的强组分相互作用。(C)2013爱思唯尔有限公司版权所有。
Biomass thermochemical decomposition products have been extensively studied as renewable substitutes of fossil fuel. The approach proposed in this work considers vegetal waste as a source of both energy and matter through the production of a vapor phase fuel, highly diluted in steam, suitable to be burned in non-conventional combustion systems and a char with soil amending and fertilizing properties.To demonstrate the feasibility of such a process an experimental set-up has been designed with the aim to investigate the effect of pressure, heating rate and final temperature in proper variation ranges (P = 1-5 x 10(5) Pa, HR = 5-40 K/min, T=473-973 K) on the yields and on the chemical and physical properties of gaseous and solid products. In this paper the effect of temperature at constant pressure (P= 5 x 10(5) Pa) and heating rate (HR = 5 K/min) has been investigated in order to explore all the stages of the thermochemical degradation from torrefaction to mild gasification passing through devolatilization. For real biomasses a basic study on characterization of biomass components is needed.Knowledge of dependences on feedstock nature and process conditions is crucial for the comprehension of phenomena occurring during steam pyrolysis of real complex biomasses and for the optimization of the process operating variables. This study characterizes steam pyrolysis up to 873 K (at pressure P= 5 x 10(5) Pa and heating rate HR = 5 K/min) both of three single biomasses constituents (cellulose, hemicellulose and lignin) and of three binary mixtures in order to evaluate possible interactions between the biomass components. The results obtained highlight the importance of the interactions between components, mainly cellulose and lignin, on the yield and characteristics of solid and gaseous products. In particular, strong components interactions have been detected on the specific surface area of the solid product. (C) 2013 Elsevier B.V. All rights reserved.