Pyrolysis and Ignition Characteristics of Pulverized Coal Particles

[+] Author and Article Information
Masayuki Taniguchi, Hirofumi Okazaki, Hironobu Kobayashi, Shigeru Azuhata, Hiroshi Miyadera

Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan

Hidetaka Muto

Power Engineering Systems, Babcock-Hitachi, K. K., Tokyo, Japan

Toshikazu Tsumura

Kure Division, Babcock-Hitachi, K. K., Hiroshima, Japan

J. Energy Resour. Technol 123(1), 32-38 (Oct 30, 2000) (7 pages) doi:10.1115/1.1347989 History: Received March 15, 2000; Revised October 30, 2000
Copyright © 2001 by ASME
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Schematic drawing of ignition equipment
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Particle diameter distributions of tested coals
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Radial temperature distributions downstream from the nozzle exit
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Examples of photos showing ignition of coal clouds for coal A; stoichiometric ratio of primary air and coal (SR1) was 0.22
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Axial profiles of gas concentration and coal burnout; SR1 was 0.22
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Axial profiles of gas and particle temperatures
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Axial coal burnout profiles of fine (7–37 μm), intermediate (37–74 μm), and coarse (74–150 μm) particles; SR1 was 0.36
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Pyrolysis characteristics of tested coals in nitrogen. Heating rate of the coals was 0.33 K/s; lines are calculated results; symbols are experimental results.
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Distribution of activation energy of pyrolysis for coal B
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Pyrolysis characteristics of coal B under high heating rate. Oxygen concentration and temperature of surrounding gas were 75 percent and 300 K, respectively. Heating rate of the particles was around 106 K/s—(a) Experimental results of particle temperature and pictures of burning particles obtained from reference 16. (b) Pyrolysis rate obtained from calculation.
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Effects of particle diameter on pyrolysis processes. Lines are calculated results; Symbols are experimental results shown in Fig. 7. (a) Only convective heat transfer was included in the calculation. (b) Radiation heat transfer was included after ignition.
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Relation between coal burnout and stoichiometric ratio of primary air and pyrolyzed volatile matter (SRvolatile)
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Effects of coal type and coal concentration on ignition temperatures. Lines are calculated results; symbols are experimental results.
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Burner configuration and axial profiles of gas concentration and temperature of a semi-industrial-sized burner



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