微波加热模式对可持续地将塑料废物分解成氢气的启示

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS
Peng Zhang, Cai Liang, Xiaoping Chen, Daoyin Liu, Jiliang Ma
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引用次数: 0

摘要

利用可再生资源制造可持续燃料已成为实现变废为宝理念的一项前瞻性技术。本文提出了快速微波驱动法,并通过实验和数值方法揭示了体积加热和局部加热两种微波加热模式。一方面,微波能量通过介电损耗和磁损耗被消耗并转化为体积热。粒子内部的温度分布与微波功率耗散密度一致,同时受到电场和磁场的影响。另一方面,多粒子系统中相当一部分微波能量是通过局部等离子体放电和大量热爆发消耗掉的。微波等离子体的温度提高了约 3 倍,这表明微波能量的转换得到了加强。这种局部加热模式诱发了集中热点,并导致温度向内激增,温度梯度超过 180 ℃-s-1。通过耗散的体积加热和等离子体的局部加热耦合,促进了塑性分解的独特和高效性能,其 H2 产率达到 280 mmol-g-1Hplastic。总之,这项工作促进了对微波加热模式和温度分布的深入了解,为进一步优化微波催化剂以实现高效和可持续的资源化提供了指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Insight into microwave heating patterns for sustainable decomposition of plastic wastes into hydrogen

Insight into microwave heating patterns for sustainable decomposition of plastic wastes into hydrogen
The manufacture of sustainable fuels from renewable resources has become a prospective technology towards the waste-to-resource concept. In this paper, the rapid microwave-driven method was proposed, and two microwave heating patterns of volumetric heating and localized heating were revealed through experimental and numerical methods. On the one hand, the microwave energy was consumed and transformed into heat volumetrically via dielectric loss and magnetic loss. The temperature distribution inside the particle was consistent with the microwave power dissipation density, simultaneously influenced by the electric field and magnetic field. On the other hand, a considerable portion of microwave energy in the multiparticle system was expended by local plasma discharging with massive heat bursts. The temperature enhancement of about 3 times was achieved by the microwave plasma, indicating the intensified conversion of microwave energy. This localized heating pattern induced the concentrated hotspot and led to the radical temperature rise inwards with a temperature gradient of over 180 °C·s−1. The coupling of volumetric heating by dissipation and localized heating by plasma facilitated the distinctive and efficient performance of plastic decomposition with the H2 yield of 280 mmol·g−1Hplastic. Altogether, this work promoted the insight into the microwave heating patterns and temperature distribution, which provided guidance for the further optimization of microwave catalysts for efficient and sustainable valorization.
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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