Analysis of steam flow behavior in packed bed of coal particles

Masashi Nishizawa, Takayuki Morito, Makoto Matsuura, Hideyuki Aoki, Takatoshi Miura

Research output: Contribution to journalArticlepeer-review


The steam outflow rate and temperature distribution in a packed bed of coal particles were measured and compared with the results of a numerical analysis in order to determine the steam flow behavior in a coke oven chamber. The moisture-controlled and size-graded pulverized coal particles were packed in a cylindrical stainless steel vessel with steam flow pipes at both ends of the vessel. The upper end of the vessel was heated from 293 K to 653 K with a constant heating rate of 3 K/min and maintained at 653 K. The numerical analysis, which was based on a new concept of the evaporation/condensation behavior, was conducted in an axisymmetrical coordinate system. The unsteady heat conduction equation in the solid phase and the mass, momentum, and energy conservation equations in the gas phase were solved simultaneously. The condensed water in the bed is assumed to be static and a part of the solid phase under the assumption of local thermal equilibrium. Estimated results on the temperature distribution and the steam outflow rate are quantitatively in good agreement with experimental results and the model performance is verified. The steam flow toward the heated side decreases the heat transfer rate to the inside, while the flow toward the insulated side increases it.

Original languageEnglish
Pages (from-to)238-253
Number of pages16
JournalHeat Transfer - Asian Research
Issue number4
Publication statusPublished - 1996


  • Mathematical model
  • Packed bed drying
  • Pulverized coal


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