An evaluative comparison of lignocellulosic pyrolysis products derived from various parts of Populus deltoides trees and Panicum virgatum grass in an inductively heated reactor
An evaluative comparison of lignocellulosic pyrolysis products derived from various parts of Populus deltoides trees and Panicum virgatum grass in an inductively heated reactor
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DOI：
10.1016/j.enconman.2018.06.026
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发表时间：
2018-09
影响因子：
10.4
通讯作者：
Dideolu J. Daniel;Candice R. Ellison;J. Bursavich;McKenna Benbow;Caroline Favrot;M. Blazier;C. Marculescu;S. Nokes;D. Boldor
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文献类型：
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作者：
Dideolu J. Daniel;Candice R. Ellison;J. Bursavich;McKenna Benbow;Caroline Favrot;M. Blazier;C. Marculescu;S. Nokes;D. Boldor
由于白杨生长迅速且对环境胁迫具有耐受性，因此被认为是生产可再生燃料和化学品的合适资源。柳枝稷也被广泛研究用于生物燃料生产，因为它是一种资源高效的低投入植物，能够在不同的天气或土壤条件下生长和茁壮成长。在这项研究中，从东部棉白杨叶杨（Populus deltoides）和柳枝稷（Panicum virgatum）的各个部分（主茎，次生茎，树枝）获得的生物质的快速热解在感应加热反应器中进行。首先获得脱挥发分速率（范围从450 °C至600 °C）以确定它们的分解动力学并估计适合于使用这种热解方法对其进行热解的工艺参数（温度和时间）。研究了温度（450 °C、500 °C、550 °C）对热解产物产率和组成的影响。结果表明，活化能范围为9.2至13.5 kJ/mol，而指前常数范围为0.23至0.51 s−1。在450 °C下从白杨茎中获得的生物油的最大量为39.8% ± 9.50，而在550 °C下从白杨分支中获得的生物油的最小量为33% ± 0.0085。在450 °C下获得来自柳枝稷的最高量的生物油（34% ± 0.023）。柳枝稷生物油的含水量显著高于白杨生物油。GC-MS分析结果表明，白杨各部位的生物油成分相似，酚类化合物占优势，酸类和醇类化合物的含量可忽略不计。随着温度的升高，观察到呋喃的增加。来自茎的生物油和炭级分的HHV高于来自柳枝稷的那些，炭和无水生物油的平均HHV分别在20.2和25.6 MJ/kg以及13.2和−16.4 MJ/kg之间。在500 °C下热解的棉白杨主茎的情况下，从初始生物质的总体过程能量回收达到最大值80.1%。
Poplar is considered a suitable resource for production of renewable fuels and chemicals due to its rapid growth and tolerance to environmental stresses. Switchgrass is also extensively studied for biofuel production due to its use as a resource-efficient low-input plant and ability to grow and thrive in diverse weather or soil conditions. In this study, fast pyrolysis of biomass obtained from various parts (main stem, secondary stems, branches) of eastern cottonwood (Populus deltoides) and switchgrass (Panicum virgatum)was carried out in an inductively heated reactor. Devolatilization rates (ranging from 450 °C to 600 °C) were initially obtained to determine their decomposition kinetics and estimate process parameters (temperatures and times) suitable for their pyrolysis using this method of pyrolysis. The effect of temperature (450 °C, 500 °C, 550 °C) on pyrolysis product yields and composition was investigated. Results indicate that activation energies ranged from 9.2 to 13.5 kJ/mol, while pre-exponential constants ranged from 0.23 to 0.51 s−1. The maximum quantity of bio-oil of 39.8% ± 9.50 was obtained from poplar stem at 450 °C whereas the least amount of bio-oil obtained was 33% ± 0.0085 from poplar branch at 550 °C. The highest amount of bio-oils from switchgrass (34% ± 0.023) was obtained at 450 °C. Water content in the bio-oil obtained from switchgrass was significantly higher than that from poplar. The GC–MS results showed that bio-oil compositions are similar among the various parts of poplar trees, with phenols being the dominant chemical specie and acids and alcohols present in negligible amounts. As temperature increases, an increase in furans is observed. Bio-oil and char fractions derived from stems have higher HHV than those from switchgrass, with the average HHV of char and water-free bio-oils ranging between 20.2 and 25.6 MJ/kg and 13.2 and −16.4 MJ/kg, respectively. Overall process energy recovery from initial biomass reached a maximum of 80.1% in the case of cottonwood main stem pyrolyzed at 500 °C.