Revelation of non-thermal effects on microwave drying of lignite: Reactor design and drying characteristics

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2024-11-29 DOI:10.1016/j.fuel.2024.133893

Lei Wu , Yining Guan , B. Rajasekhar Reddy , Changcong Li , Rock Keey Liew , Jun Zhou

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Abstract

Microwave non-thermal effects are controversial and its effects on lignite microwave drying remain blank. The lignite drying characteristics in shielded microwave drying (SMD) and unshielded microwave drying (USMD) using a self-designed SiC composite shielded sleeve were compared. The results showed that the positive influences of the non-thermal effects in lignite microwave drying were obtained. The non-thermal effects could significantly increase the microwave drying rate of lignite, enhance its ability to remove moisture, improve the average diffusion coefficient, and effectively reduce the drying activation energy. The lignite in USMD achieved a maximum drying rate of 0.86 g/g min after just 2 min of drying at 700 W. The average diffusion coefficient of lignite reached a maximum of 3.57 × 10^-6 m²/s, and the activation energy reached a minimum of 113.15 W/g. This paper provides some new evidences for the existence of non-thermal effects, and firstly reveals its influences effects on lignite microwave drying.

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褐煤微波干燥非热效应的揭示：反应器设计与干燥特性

微波非热效应存在争议，对褐煤微波干燥的影响仍是空白。比较了自制的碳化硅复合材料屏蔽套筒在屏蔽微波干燥（SMD）和非屏蔽微波干燥（USMD）中褐煤的干燥特性。结果表明，非热效应对褐煤微波干燥有积极的影响。非热效应能显著提高褐煤微波干燥速率，增强其除湿能力，提高平均扩散系数，有效降低干燥活化能。在700瓦下干燥2分钟后，USMD褐煤达到了0.86 g/g min的最大干燥速率。褐煤的平均扩散系数最大值为3.57 × 10-6 m2/s，活化能最小值为113.15 W/g。本文为非热效应的存在提供了新的证据，并首次揭示了非热效应对褐煤微波干燥的影响。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.