NDLI: Particle characteristics of anthracite powder preheated quickly in circulating fluidized bed

Content Provider	IEEE Xplore Digital Library
Author	Ziqu Ouyang Jianguo Zhu Qinggang Lv Jun Wang Haimeng Hou
Copyright Year	2013
Description	Author affiliation: Grad. Univ. of Chinese Acad. of Sci., Beijing, China (Ziqu Ouyang; Jun Wang; Haimeng Hou) \|\| Inst. of Eng. Thermophys., Beijing, China (Jianguo Zhu; Qinggang Lv)
Abstract	Experimental studies were carried out on a bench-scale rig of pulverized anthracite combustion preheated by circulating fluidized bed (CFB). The preheated anthracites were sampled at the outlet of CFB and the effect of preheating temperature on particle characteristics was investigated. The particle size distribution of preheated anthracite powder was tested by a Malvern Mastersizer 2000 laser analyzer. The specific surface area, pore volume and pore diameter were analyzed by nitrogen absorption method. Scanning electron microscope (SEM) was used for a better observation on particle surface. It is found that when the preheat temperature is 900°C, the 50% cut size $(d_{50})$ of the anthracite before and after being preheated decrease from 82 μm to 23 μm. For the preheated fuel, the pores in micro-size with the diameter smaller than 2 nm and meso-size with the diameter ranging from 2 nm to 10 nm are major contributors for the overall specific surface area and pore volume. Furthermore, variations of specific surface area and pore volume versus preheating temperature can be divided into two regions: below 900°C and above 900°C. In the first region, the specific surface area and pore volume increase as the preheating temperature increases, while in the second region they decrease with the increase in the preheating temperature. Based on the SEM analysis, after being preheated, a lot of cracks and pores appear on the particle surface, and the pore structure is well developed.
Starting Page	796
Ending Page	801
File Size	185394
Page Count	6
File Format	PDF
ISBN	9781479933358
e-ISBN	9781479933365
DOI	10.1109/ICMREE.2013.6893794
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circulating fluidized bed Temperature distribution Powders Surface morphology Coal Preheated fuel Porous structure Combustion Anthracite Surface treatment
Content Type	Text
Resource Type	Article

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