Integration of Thermal Treatment and Extrusion by Compounding for Processing Various Wastes for Energy Applications
Integration of Thermal Treatment and Extrusion by Compounding for Processing Various Wastes for Energy Applications
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DOI：
10.1021/acs.energyfuels.1c01836
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发表时间：
2021-08
期刊：
影响因子：
5.3
通讯作者：
S. Kolapkar;S. Zinchik;Zhuo Xu;A. McDonald;E. Bar-Ziv
中科院分区：
文献类型：
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作者：
S. Kolapkar;S. Zinchik;Zhuo Xu;A. McDonald;E. Bar-Ziv
废物的产生正在增加，其中很大一部分废物正在被填埋。将这些废物进行热解以生产清洁燃料是潜在的解决方案之一。本文研究了纤维塑料混合废料在300℃下，在处理能力高达70 kg/h的一体化螺杆反应器中的热解，实验测量了热解-挤出过程和制粒过程的热机械性能。研究了混合废物的热力学、竖井结构对停留时间、比机械能(SME)、换热系数(U)、比热(C)的影响，以及球团矿的力学和流变性。首先，研究了加热器在有无物料流动的情况下，系统的热力学响应。停留时间测量表明，20%和40%切割飞行的停留时间分别是普通螺丝的2.3和3.7倍。测得非均相混合物的比热为1.58kJ/(kg°C)。在52.5W/(m2°C)下，实验测得了反应器的平均总换热系数。当进料速度从∼10增加到50 kg/h时，比机械能与质量流量的相关性降低了3倍以上。对所生产的球团进行了热机械分析、弯曲测试和流变性测试。
Waste generation is increasing, and a significant portion of the wastes is being landfilled. Torrefaction of such wastes to produce clean fuels is one of the potential solutions. This paper studied torrefaction of mixed fiber–plastic wastes at 300 °C in an integrated torrefaction–extrusion screw reactor with a throughput of up to 70 kg/h. The study experimentally measured the thermomechanical properties of the torrefaction–extrusion process and the pellets produced. The study presents the results for thermal dynamics, the effect of shaft configuration on residence time, specific mechanical energy (SME), heat transfer coefficient (U), specific heat (C) of mixed wastes, and mechanical and rheological properties of pellets. First, the thermal dynamics of the system were studied along the corresponding response of heaters with and without the flow of materials measured. The residence time measurement showed 20% and 40% cut flighting had about 2.3 and 3.7 times more residence time compared to a regular screw. The specific heat of the heterogeneous mix blend was measured at 1.58 kJ/(kg °C). The average overall heat transfer coefficient was measured experimentally for the reactor at 52.5 W/(m2°C). The correlation between specific mechanical energy and mass flow showed more than 3 times decrease in specific energy consumed when the feed rate was increased from ∼10 to 50 kg/h. Thermomechanical analysis, flexural testing, and rheological testing were performed on the produced pellets to measure pellet properties.