Korean Journal of Chemical Engineering

, Volume 16, Issue 6, pp 798–803

Effects of pressure in coal pyrolysis observed by high pressure TGA



High-pressure thermogravimetric analyzer was employed to investigate the effects of pressure on the thermal decomposition process, which is the very first step in most coal utilizing processes, and pyrolyzates from TGA were analyzed by on-line GC/MS. Results showed that pyrolysis of coal with steam under high-pressure conditions exhibited a slower reaction rate compared to the lower pressure conditions, and the effect is more evident at the high temperature region. Coal rank also exhibited a distinct effect on the pyrolysis rate such that a subbituminous coal showed a bigger effect by steam-addition and pressure than bituminous coals. Weathered coal sample illustrated a slower reaction rate compared to the unoxidized coal. In addition, the implication of pressure effects on pyrolysis has been described.

Key words

Pressure Effects Coal Pyrolysis TGA IGCC PFBC 


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  1. Azuhata, S., Hedman, P. O., Smoot, L. D. and Sowa, W. A., “Effects of Flame Type and Pressure on Entrained Coal Gasification,”Fuel,65(11), 1511 (1986).CrossRefGoogle Scholar
  2. Cuenca, M. A. and Anthony E. J. eds., “Pressurized Fluidized Bed Combustion,” Blackie Academic & Professional, Glasgow` (1995).Google Scholar
  3. Fjellerup, J., Gjernes, E. and Hansen, L. K., “Pyrolysis and Combustion of Pulverized Wheat Straw in a Pressurized Entrained Flow Reactor,”Energy & Fuels,10(3), 649 (1996).CrossRefGoogle Scholar
  4. Gibbins, J. and Kandiyoti, R., “Experimental Study of Coal Pyrolysis and Hydropyrolysis at Elevated Pressures Using a Variable Heating Rate Wire-Mesh Apparatus,”Energy & Fuels,3(6), 670 (1989).CrossRefGoogle Scholar
  5. Joseph, J. T. and Mahajan, O. P., “Effect of Air Oxidation on Aliphatic Structure of Coal,” Coal Science II, ACS Symposium Series 461, Schobert, H. H., Bartle, K. D. and Lynch, L. J., eds., ACS, Washington, DC (1991).Google Scholar
  6. Lee, I. C, “Reactivity of Coal-Steam Gasification at High Temperature,”Korean J. Chem. Eng.,4,194 (1987).CrossRefGoogle Scholar
  7. Saastamoinen, J. J., Aho, M. J. and Hamalainen, J. P., “Pressurized Pulverized Fuel Combustion in Different Concentrations of Oxygen and Carbon Dioxide,”Energy & Fuels,10(1), 121 (1996).CrossRefGoogle Scholar
  8. Smith, K. L., Smoot, L. D., Fletcher, T. H. and Pugmire, R. J., “The Structure and Reaction Processes of Coal,” Plenum Press, New York, 357 (1994).Google Scholar
  9. Smoot, L. D. and Smith, P. J., “Coal Combustion and Gasification,” Plenum Press, 41 (1985).Google Scholar
  10. Song, B., Kang, Y, Seo, Y, Jin, G., Son, J. and Kim, S., “Effect of Pressure on the Combustion Characteristics in a Pressurized Bed Coal Combustor”HWAHAK KONGHAK,34,619 (1996).Google Scholar
  11. Speight, J. G., “The Chemistry and Technology of Coal,” Marcel Dekker, Inc., New York (1994).Google Scholar
  12. Wen, C. Y and Lee, E. S., Ed., “Coal Conversion Technology,” Addison-Wesley Pub. Co., Inc., 57 (1979).Google Scholar
  13. Yun, Y, Meuzelaar, H. L. C, Simmleit, N. and Schulten, H., “Vacuum Pyrolysis Mass Spectrometry of Pittsburgh No. 8 Coal: Comparison of Three Different, Time-Resolved Techniques,”Energy & Fuels,5(1), 22 (1991).CrossRefGoogle Scholar

Copyright information

© Korean Institute of Chemical Engineering 1999

Authors and Affiliations

  1. 1.Materials/Processing LaboratoryInstitute for Advanced EngineeringKyunggi-doKorea

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