Physical structure and combustion properties of
super ®ne pulverized coal particle
, Zheng Chuguang
, Yan Che
, Qiu Jianrong
, Li Jubin
National Laboratory of Coal Combustion, Huazhong University of Science and Technology,
1037Luoyu Road, Wuhan 430074, People's Republic of China
Northeast China Institute of Electrical Power, Jilin 132012, People's Republic of China
Received 5 January 2001; accepted 12 November 2001; available online 7 December 2001
Physical structures and combustion properties of super ®ne pulverized coal particles of eight Chinese coals, Heshan subbituminous coals
and Jincheng lean coals from two areas of China, have been investigated using accelerated surface area and porosimetry, thermobalance
(TGA), and Fourier transform infrared spectrometer. Results showed that the particle speci®c surface area and pore volume increased greatly
when the coal particle size was reduced. The higher the carbon content on a dry ash-free basis is, the larger the particle speci®c surface area
and pore volume are. When the coal particle size decreases, the combustion process can be largely improved, ignition temperature is reduced,
emission from coal combustion is also lower. q 2001 Published by Elsevier Science Ltd.
Keywords: Coal combustion; Structure; Coal physical property; Super ®ne pulverized coal particle; Desulfuration
In the foreseeable future, coal will continue to be a major
fuel for power generation. Current coal ®red power genera-
tion systems in China and elsewhere in the world are based
largely on the combustion of pulverized coal. Experiment
results have proven that pulverized coal particle size and its
distribution in¯uence ignition temperature, char burnout,
¯ame stability, NO
emission, and comprehensive
operation costs [1±3]. Combustion of super ®ne particles,
particle diameter below 20 mm on average, is a new combus-
tion technique compared with conventional pulverized fuel
combustion techniques, and has been developed in China
and other countries . Physical structure of pulverized coal
particles is a key factor for coal combustion process because it
affects heat and mass transfer rate and reaction surface. The
effect of pulverized coal particle size on the physical structure
and performance of pulverized fuel combustion of coal have
long been a research subject [5±10]. However, there have not
been many researches on super ®ne pulverized coal particles.
In this research, a MALVERN laser grainulometric particle
size analyzer, MAM 5004, was used to measure the particle
size distribution and a NETZSCH thermobalance was used to
test the samples' combustion properties. Accelerated surface
area and porosimetry (ASAP) was used to detect special
surface area and STA 409C with Fourier transform infrared
spectrometer was used to detect sulfur release from four
different size samples. Experiment results have shown that
the physical structure, combustion property and environ-
mental performance have all been greatly improved when
super ®ne pulverized coal particles are used.
Eight different particle size samples were taken from
Heshan (Hs) and Jincheng (Jc) of China. The ultimate analy-
sis data were done on a LECO CHN 600 and a Sulfur
Analyzer; oxygen content was calculated by difference.
The proximate analysis was done on a LECO MAC 50.
Four different size distribution samples were prepared for
each of the two coals. The mean particle size was analyzed
on MALVERN laser grainulometric analyzer MAM 5004.
The sample mean volume diameter is listed in Table 1. The
ultimate and proximate analyses of two coals are given in
Fuel 81 (2002) 793±797
0016-2361/02/$ - see front matter q 2001 Published by Elsevier Science Ltd.
* Corresponding author. Tel.: 186-432-4887739/86-27-87542417;
E-mail addresses: email@example.com (J. Xiumin),
firstname.lastname@example.org (J. Xiumin).
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