کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6634418 | 461108 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improving the permittivity of Indonesian lignite with NaCl for the microwave dewatering enhancement of lignite with reduced fractal dimensions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 2.34Â wt% NaCl increased from 0.190 to 0.311 at 2.45Â GHz; 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 1.61Â m2/s to 4.02Â m2/s, respectively, when NaCl content increased from 0Â wt% to 4.67Â wt%. The pore fractal dimension of dewatered lignite pores decreased from 2.40 to 2.32 with a microwave at 600Â W for 8Â min; 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 Clâ was better than that of SO42â. This phenomenon may be because Na+ and Clâ with small hydrated radii exhibit high movement speeds in electromagnetic fields.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 162, 15 December 2015, Pages 8-15
Journal: Fuel - Volume 162, 15 December 2015, Pages 8-15
نویسندگان
Fan Zhou, Jun Cheng, Jianzhong Liu, Zhihua Wang, Junhu Zhou, Kefa Cen,