Utilization of microwave steam pyrolysis to produce biochar for thermal energy storage

Wahap bin Abu Bakar, Peter Nai Yuh Yek, Kah Yein Cheong, Augustine Chioma Affam, Chee Chung Wong, Rock Keey Liew, Yie Hua Tan, Su Shiung Lam
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引用次数: 1

Abstract

Microwave steam pyrolysis (MSP) is an innovative thermochemical approach to converting biomass into high-quality biochar using steam to improve the dielectric heating of microwave radiation. Biochar shows high fixed carbon and carbon contents at a maximum temperature of 550 °C in 10 min. The MSP achieved a heating rate of 112 °C/min from 200 °C to 400 °C to produce biochar effectively. Furthermore, the thermal properties of biochar in microwave heating were investigated in this study to explore its potential as a microwave heat-absorbent material. Microwave is able to perform volumetric and controllable heating to the biochar. Moreover, biochar shows good microwave heat absorbency, storing and transferring heat effectively. The temperature profile of three different sizes of biochar was investigated to examine the efficiency of biochar in heat absorption from microwave radiation. It was found that the powder form of biochar showed a higher heat transfer rate of 40 °C/min and a low cooling rate of 7.5 °C/min. The presented results are useful for evaluating the application of biochar as a promising medium for heat storage systems.

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利用微波蒸汽热解生产生物炭用于热能储存
微波蒸汽热解(MSP)是一种创新的热化学方法,利用蒸汽提高微波辐射的介电加热,将生物质转化为高质量的生物炭。生物炭在最高温度为550°C, 10 min内显示出较高的固定碳和碳含量。MSP在200°C至400°C的加热速率为112°C/min,可以有效地生产生物炭。此外,本研究还研究了生物炭在微波加热下的热性能,以探索其作为微波吸热材料的潜力。微波可以对生物炭进行体积加热和可控加热。此外,生物炭具有良好的微波吸热性能,能有效地储存和传递热量。研究了三种不同尺寸的生物炭的温度分布,考察了生物炭对微波辐射的吸热效率。结果表明,粉末形态的生物炭具有较高的传热速率(40°C/min)和较低的冷却速率(7.5°C/min)。本文的研究结果有助于评价生物炭作为储热系统的一种有前途的介质的应用。
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