Drying Technology· 2016Q2
Combined effects of additives and power levels on microwave drying performance of lignite thin layer
- 59citations
- Q2SCImago
- 2016year
Short summary
Adding sodium carbonate, sodium sulfate, or coal fly ash to lignite significantly enhances microwave drying performance, with sodium carbonate being the most effective, reducing energy consumption by approximately half.
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Key points
- Additives increased lignite's dielectric loss at 2,450 MHz, with lignite/Na2CO3 reaching 0.18.
- Sodium carbonate increased average thin layer temperature by 10°C compared to raw lignite at 385 W.
- Additives reduced apparent activation energies, indicating faster drying rates.
- Lignite/Na2CO3 blend at 385 W required about half the electricity energy of raw lignite.
AI-generated from the title and abstract; the full text is not read.
Abstract
The microwave drying performance of lignite thin layer in a bench-scale setup was highlighted in terms of three additives with 10% dosage. The dielectric loss for dried lignite, raw lignite, lignite/coal fly ash, lignite/Na2SO4, and lignite/Na2CO3 at 2,450 MHz were 0.06, 0.13, 0.14, 0.15, and 0.18. In comparison with raw lignite, the average temperature rising of the thin layer at 385 W for lignite blending with sodium carbonate, sodium sulfate, and coal fly ash was about 10, 7, and 2°C. The apparent activation energies of both falling rate periods for lignite blending with three additives were less than that of raw lignite. Sodium carbonate among three additives could be preferable one, followed by sodium sulfate and coal fly ash. The energy efficiency increased with the addition of sodium carbonate, sodium sulfate, and coal fly ash. The required electricity energy for lignite/Na2CO3 blend at 385 W was reduced by about one half compared with the raw lignite.
The authors' abstract, as published at the source. Drying Technology, 2016 · DOI ↗
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Field: Fuel Technology
Fuel TechnologyEnergy