Drying Technology· 2016Q2
Drying behavior of lignite under microwave heating
- 66citations
- Q2SCImago
- 2016year
Short summary
Microwave heating offers an efficient method for drying lignite, revealing three distinct drying stages: preheating, rapid weight loss, and falling rate periods, with surface temperatures remaining below 95°C.
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Key points
- Microwave drying of lignite exhibits three distinct stages: preheating, fast weight loss, and falling rate.
- Surface temperatures during microwave heating remained below 95°C.
- Drying rate increases with higher microwave power.
- Fine lignite particles (<0.2 mm) and lump samples (10 mm) dried more effectively than granular samples (1-2 mm).
- The critical moisture content of lignite was redefined as 11-15% under experimental conditions.
AI-generated from the title and abstract; the full text is not read.
Abstract
Because of lignite’s high moisture content, it must be dried before most applications. Microwave radiation may be suitable for efficient drying because of its special heating properties. This study investigated the drying behavior of lignite samples from eastern Inner Mongolia by microwave thermogravimetric analysis. Three stages of microwave drying were observed: preheating, fast weight loss, and falling rate drying periods. Samples’ surface temperatures increased dramatically during preheating, dropped slightly in the second period, and rose again in the final period. The measured surface temperature was <95°C during microwave heating. The overall moisture content decreased more rapidly under higher microwave power. Fine lignite particles (diameter <0.2 mm) and lump samples (particle size 10 mm) dried better than granular lignite (particle size 1–2 mm). The samples also underwent slight natural drying (1–2% point reduction in moisture content) after microwave treatment. The critical moisture content of lignite (11–15% under experimental conditions) was redefined. Energy consumption was analyzed to evaluate the feasibility of the proposed drying process.
The authors' abstract, as published at the source. Drying Technology, 2016 · DOI ↗
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Field: Fuel Technology
Fuel TechnologyEnergy