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TECHNICAL PAPERS

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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References

Azuhata, S., Narato, K., Kobayashi, H., Arashi, N., Morita, S., and Masai, T., 1986, “A Study of Gas Composition Profiles for Low NOx Pulverized Coal Combustion and Burner Scale-up,” Twenty-First Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, PA, pp. 1199–1206.
Kiyama, K., Tsumura, T., Sei, N., Taniguchi, M., and Nomura, S., 1997, “Combustion Technologies for High Fuel Ratio Coals,” Proc., International Conference on Power Engineering-97, Vol. 2, Tokyo, Japan, pp. 507–512.
Essenhigh,  R. H., Misra,  M. K., and Shaw,  D. W., 1989, “Ignition of Coal Particles: A Review,” Combust. Flame, 77, pp. 3–30.
Lucas, J. A., and Wall, T. F., 1994, “Volatile Matter Release, Particle/Cloud Ignition, and Combustion of Near-Stoichiometric Suspensions of Pulverized Coal,” Twenty-Fifth Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, PA, pp. 485–491.
Zhang,  D.-K., and Wall,  T. F., 1994, “Ignition of Coal Particles: the Influence of Experimental Technique,” Fuel, 73, pp. 1114–1119.
McLean, W. J., Hardesty, D. R., and Pohl, J. H., 1981, “Direct Observations of Devolatizing Pulverized Coal Particles in a Combustion Environment,” Eighteenth Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, PA, pp. 1239–1248.
Masutani,  S., Masutani,  M., Azuhata,  S., Miyadera,  H., and Hishinuma,  Y., 1988, “Pulverized Fuel Combustion in a Turbulent Round Jet Burner,” AIAA J., 4, pp. 97–103.
Costa,  M., Godoy,  S., Lockwood,  F. C., and Zhou,  J., 1994, “Initial Stages of the Devolatilization of Pulverized-Coal in a Turbulent Jet.” Combust. Flame, 96, pp. 150–162.
Therssen,  E., Gourichon,  L., and Delfosse,  L., 1995, “Devolatilization of Coal Particles in a Flat Flame—Experimental and Modeling Study,” Combust. Flame, 103, pp. 115–128.
Maruko,  S., Naoi,  T., and Onodera,  M., 1995, “Multistage Catalytic Combustion Systems and High Temperature Combustion Systems usin SiC,” Catal. Today, 26, pp. 309–317.
Chen,  J. C., and Niksa,  S., 1992, “Coal Devolatilization during Rapid Transient Heating. 1. Primary Devolatilization,” Energy Fuels, 6, pp. 254–264.
Chen,  J. C., Taniguchi,  M., Narato,  K., and Ito,  K., 1994, “Laser Ignition of Pulverized Coals,” Combust. Flame, 97, pp. 107–117.
Merrick,  D., 1983, “Mathematical Models of the Thermal Decomposition of Coal; 2. Specific Heats and Heats of Reaction,” Fuel, 62, pp. 540–546.
Davis,  H., and Hottel,  H. C., 1934, “Combustion Rate of Carbon,” Ind. Eng. Chem., 26, pp. 889–891.
Niksa,  S., and Law,  C.-W., 1993, “Global Rates of Devolatilization for Various Coal Type,” Combust. Flame, 94, pp. 293–307.
Chen,  J. C., Taniguchi,  M., and Ito,  K., 1995, “Observation of Laser Ignition and Combustion of Pulverized Coals,” Fuel, 74, pp. 323–330.

Figures

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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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