利用热重分析仪和鼓泡流化床研究核桃壳和聚乙烯的共热解行为和生物油特性

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Yu Yang , Daiyang Long , Yican Jiang , Pingping Tang , Shengji Zhang , Hao Yu
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引用次数: 0

摘要

本研究在热重分析仪和实验室规模的鼓泡流化床反应器中进行了核桃壳(WS)、聚乙烯(PE)及其混合物的共热解实验,以阐明共热解行为、协同作用和热解油特性。此外,还使用 HZSM-5 沸石作为催化剂,研究了其催化特性。结果表明,随着聚乙烯质量比从 0% 上升到 100%,初始温度从 265.4 ℃单调上升到 417.3 ℃,而最终温度则从 668.3 ℃逐渐下降到 527.5 ℃,这表明聚乙烯的加入能够加速样品的热解。混合物的共热解分为三个阶段,第一阶段为负作用,第二和第三阶段为正作用。此外,在鼓泡流化床实验中,随着温度的升高,液相产物产率先升高后降低,高温促进了含氧化合物的降解,并增强了芳烃的生成。WS 和 PE 共热解过程中的协同作用降低了液相产物产率,同时提高了气相产物产率。另一方面,与 PE 的混合促进了烷烃和烯烃的生成,同时抑制了含氧成分和芳烃的含量,重油馏分也随之增加。最后,沉积在催化剂表面的碳为无定形碳,可通过氧化过程去除,但其催化性能随着循环次数的增加而逐渐下降,导致芳烃和烯烃含量呈下降趋势,而含氧组分则呈相反趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of the co-pyrolysis behavior and bio-oil characterization of walnut shell and polyethylene by thermogravimetric analyzer and bubbling fluidized bed

In the present work, co-pyrolysis experiments of walnut shell (WS), polyethylene (PE) and their blends were performed in the thermogravimetric analyzer and lab-scale bubbling fluidized bed reactor, to clarify co-pyrolysis behaviors, synergy interactions and pyrolysis oil properties. Besides, the HZSM-5 zeolite was used as the catalyst and its catalytic characteristics were studied. Results indicated that as PE mass ratio rose from 0 to 100 %, the initial temperature monotonically increased from 265.4 to 417.3 °C, while its terminal temperature progressively decreased from 668.3 to 527.5 °C, suggesting that the addition of PE was able to accelerate the pyrolysis of samples. The co-pyrolysis of blends was distinguished into three stages, with a negative interaction observed in the first stage and positive interactions found in second and third stages. Besides, in the bubbling fluidized bed experiments, the liquid phase product yield first elevated and then reduced with rising temperature, and a high temperature promoted the degradation of oxygen-containing compounds and enhanced aromatics generation. The synergistic interaction in the co-pyrolysis of WS and PE declined the liquid phase product yield while elevating the gas phase product yield. On the other hand, blending with PE facilitated the generation of alkanes and olefins, while inhibiting the contents of oxygen-containing components and aromatics, and simultaneously, the heavy oil fraction was increased. Finally, the carbon deposited on the surface of catalysts was amorphous carbons, and could be removed by oxidation process, whereas its catalytic properties progressively declined with rising cycle number, leading to a downtrend of aromatics and olefins and an opposite trend for oxygen-containing components.

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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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