Pyrolysis and ignition characteristics of pulverized coals were examined under similar burning conditions to those of industrial burners. In the early stage, fine particles (less than 37 μm) were mainly pyrolyzed by convective heat transfer from surrounding gas. The coals ignited when pyrolyzed volatile matter mixed with surrounding air and formed a combustible mixture. Pyrolysis of large particles was delayed, but accelerated after ignition by radiant heat transfer from coal flames. The effects of radiant heat transfer were strong for intermediate-size particles (37–74 μm). Ignition temperature was examined analytically by using a modified distributed activation energy model for pyrolysis. The calculated results agreed with experimental ones obtained from both laboratory-scale and semi-industrial-scale burners.
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March 2001
Technical Papers
Pyrolysis and Ignition Characteristics of Pulverized Coal Particles
Masayuki Taniguchi,
e-mail: masayuki_taniguchi@pis.hitachi.co.jp
Masayuki Taniguchi
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
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Hirofumi Okazaki,
Hirofumi Okazaki
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
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Hironobu Kobayashi,
Hironobu Kobayashi
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
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Shigeru Azuhata,
Shigeru Azuhata
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
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Hiroshi Miyadera,
Hiroshi Miyadera
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
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Hidetaka Muto,
Hidetaka Muto
Power Engineering Systems, Babcock-Hitachi, K. K., Tokyo, Japan
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Toshikazu Tsumura
Toshikazu Tsumura
Kure Division, Babcock-Hitachi, K. K., Hiroshima, Japan
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Masayuki Taniguchi
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
e-mail: masayuki_taniguchi@pis.hitachi.co.jp
Hirofumi Okazaki
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
Hironobu Kobayashi
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
Shigeru Azuhata
Power & Industrial Systems R & D Laboratory, Hitachi, Ltd. Power & Industrial Systems, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
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
Contributed by the Fuels and Combustion Technologies Division and presented at the 2nd International Symposium on Advanced Energy Conversion Systems and Related Technologies, Nagoya, Japan, December 1–3, 1998, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the FACT Division, March 15, 2000; revised manuscript received October 30, 2000. Associate Editor: C. Saltiel.
J. Energy Resour. Technol. Mar 2001, 123(1): 32-38 (7 pages)
Published Online: October 30, 2000
Article history
Received:
March 15, 2000
Revised:
October 30, 2000
Citation
Taniguchi, M., Okazaki , H., Kobayashi , H., Azuhata , S., Miyadera, H., Muto, H., and Tsumura, T. (October 30, 2000). "Pyrolysis and Ignition Characteristics of Pulverized Coal Particles ." ASME. J. Energy Resour. Technol. March 2001; 123(1): 32–38. https://doi.org/10.1115/1.1347989
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