A kinetic study of pyrolysis and combustion of microalgae Chlorella vulgaris using thermo-gravimetric analysis
A kinetic study of pyrolysis and combustion of microalgae Chlorella vulgaris using thermo-gravimetric analysis
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DOI：
10.1016/j.biortech.2012.10.043
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发表时间：
2013-01-01
影响因子：
11.4
通讯作者：
Chakraborty, Saikat
中科院分区：
文献类型：
--
作者：
Agrawal, Ankit;Chakraborty, Saikat
本研究采用热重法、差热重法和差热分析法，以5-40℃/min的升温速率从50℃加热至800℃，对小球藻（Chlorella vulgaris）的热解（惰性/N-2气氛）和（氧化）燃烧动力学进行了评价。本研究表明，燃烧产生的生物质转化率高于热解，两种情况下均发生三个阶段的分解，其中第二阶段是主要的脱挥发阶段，由两个温度区组成。蛋白质和碳水化合物分别以51和45 kJ/mol的活化能在第一个区域进行热解和燃烧，而脂类则以64和63 kJ/mol的较高活化能在第二个区域进行分解。得到了热解和燃烧两个区域反应速率的动力学表达式，表明升温速率越快，转化率越高。(C) 2012 Elsevier Ltd.版权所有。
This work uses thermo-gravimetric, differential thermo-gravimetric and differential thermal analyses to evaluate the kinetics of pyrolysis (in inert/N-2 atmosphere) and (oxidative) combustion of microalgae Chlorella vulgaris by heating from 50 to 800 degrees C at heating rates of 5-40 degrees C/min. This study shows that combustion produces higher biomass conversion than pyrolysis, and that three stages of decomposition occur in both cases, of which, the second one - consisting of two temperature zones - is the main stage of devolatization. Proteins and carbohydrates are decomposed in the first of the two zones at activation energies of 51 and 45 kJ/mol for pyrolysis and combustion, respectively, while lipids are decomposed in its second zone at higher activation energies of 64 and 63 kJ/mol, respectively. The kinetic expressions of the reaction rates in the two zones for pyrolysis and combustion have been obtained and it has been shown that increased heating rates result in faster and higher conversion. (C) 2012 Elsevier Ltd. All rights reserved.