Improving the permittivity of Indonesian lignite with NaCl for the microwave dewatering enhancement of lignite with reduced fractal dimensions

Improving the permittivity of Indonesian lignite with NaCl for the microwave dewatering... To upgrade Indonesian lignite with high moisture content for generating quality gasification fuel, NaCl was used to improve the permittivity of this lignite, thus enhancing microwave dewatering rate. The dielectric loss factor of lignite with 2.34wt% NaCl increased from 0.190 to 0.311 at 2.45GHz; as a result, the conversion of electromagnetic energy to thermal energy increased by 64%. Furthermore, the peak dewatering rate and moisture diffusion coefficient of lignite with microwaves increased exponentially from 6.5%/min to 13.20%/min and from 1.61m2/s to 4.02m2/s, respectively, when NaCl content increased from 0wt% to 4.67wt%. The pore fractal dimension of dewatered lignite pores decreased from 2.40 to 2.32 with a microwave at 600W for 8min; this dimension then dropped further to 2.26 with the addition of NaCl. The promoting effect of Na+ on microwave dewatering was better than those of K+ and Ca2+, whilst the promoting effect of Cl− was better than that of SO42−. This phenomenon may be because Na+ and Cl− with small hydrated radii exhibit high movement speeds in electromagnetic fields. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fuel Elsevier

Improving the permittivity of Indonesian lignite with NaCl for the microwave dewatering enhancement of lignite with reduced fractal dimensions

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier Ltd
ISSN
0016-2361
D.O.I.
10.1016/j.fuel.2015.09.007
Publisher site
See Article on Publisher Site

Abstract

To upgrade Indonesian lignite with high moisture content for generating quality gasification fuel, NaCl was used to improve the permittivity of this lignite, thus enhancing microwave dewatering rate. The dielectric loss factor of lignite with 2.34wt% NaCl increased from 0.190 to 0.311 at 2.45GHz; as a result, the conversion of electromagnetic energy to thermal energy increased by 64%. Furthermore, the peak dewatering rate and moisture diffusion coefficient of lignite with microwaves increased exponentially from 6.5%/min to 13.20%/min and from 1.61m2/s to 4.02m2/s, respectively, when NaCl content increased from 0wt% to 4.67wt%. The pore fractal dimension of dewatered lignite pores decreased from 2.40 to 2.32 with a microwave at 600W for 8min; this dimension then dropped further to 2.26 with the addition of NaCl. The promoting effect of Na+ on microwave dewatering was better than those of K+ and Ca2+, whilst the promoting effect of Cl− was better than that of SO42−. This phenomenon may be because Na+ and Cl− with small hydrated radii exhibit high movement speeds in electromagnetic fields.

Journal

FuelElsevier

Published: Dec 15, 2015

References

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