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

Fuel 162 (2015) 8–15 Contents lists available at ScienceDirect Fuel journal homepage: www.else /locate/fuel Improving the permittivity of Indonesian lignite with NaCl for the microwave dewatering enhancement of lignite with reduced fractal dimensions Fan Zhou, Jun Cheng ⇑, Jianzhong Liu, Zhihua Wang, Junhu Zhou, Kefa Cen State Key Lab of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China a r t i c l e i n f o a b s t r a c t Article history: To upgrade Indonesian lignite with high moisture content for generating quality gasification fuel, NaCl Received 7 July 2015 was used to improve the permittivity of this lignite, thus enhancing microwave dewatering rate. The Received in revised form 1 September 2015 dielectric loss factor of lignite with 2.34 wt% NaCl increased from 0.190 to 0.311 at 2.45 GHz; as a result, Accepted 1 September 2015 the conversion of electromagnetic energy to thermal energy increased by 64%. Furthermore, the peak Available online 9 September 2015 dewatering rate and moisture diffusion coefficient of lignite with microwaves increased exponentially 2 2 from 6.5%/min to 13.20%/min and from 1.61 m /s to 4.02 m /s, respectively, when NaCl content increased Keywords: