A NUMERICAL MODEL FOR CHEMICAL REACTION ON SLAG LAYER SURFACE AND SLAG LAYER BEHAVIOR IN ENTRAINED-FLOW GASIFIER

Abstract

The paper concerns with slag layer accumulation, chemical reaction on slag layer surface, and slag layer flow, heat and mass transfer on the wall of entrained-flow coal gasifier. A slag layer model is developed to simulate slag layer behaviors in the coal gasifier. This 3-D model can predict temperature, slag particle disposition rate, disposition particle composition, and syngas distribution in the gasifier hearth. The model is used to evaluate the effects of O2/coal ratio on slag layer behaviors.

Keywords

Dates

  • Submission Date2013-01-18
  • Revision Date2013-04-26
  • Acceptance Date2013-05-18
  • Online Date2013-12-28

DOI Reference

10.2298/TSCI1305389L

References

  1. Reid, W. T., Cohen, P., The Flow Characteristics of Coal-Ash Slags in the Solidification Range, Trans. ASME, 66 (1944), pp. 685-690
  2. Seggiani, M., Modeling and Simulation of Time Varying Slag Flow in a Prenflo Entrained-Flow Gasifier, Fuel, 77 (1998), 14, pp. 1611-1621
  3. Benyon, P., et al., Engineering Modeling of High Pressure and Temperature Entrained-Flow Gasifiers, Japan-Austrialia Joint Technical Meeting of Coal, Fukuoka, Japan, 2000
  4. Benyon, P. J., Computational Modeling of Entrained Flow Slagging Gasifiers, Ph. D. thesis, University of Sydney, Sydney, Australia, 2002
  5. Zhou, J. H., et al., Numerical Simulation for Pulverized Coal Gasifier' Heating Nozzle and Slag Building Model, Proceedings, of CSEE, 27 (2007), 26, pp. 23-29
  6. Walsh, P. M., et al., Deposition of Bituminous Coal Ash on an Isolated Heat Ex-Changer Tube: Effects of coal Properties on Deposit Growth, Progress in Energy and Combustion Science, 4 (1990), 16, pp. 327-346
  7. Chen, C. X., et al., Numerical Simulation of Entrained Flow Coal Gasifiers, Part I: Modeling of Coal Gasification in an Entrained Flow Gasifier, Chemical Engineering Science, 55 (2000), 18, pp. 3861- 3874
  8. Hurt, R. H., Calo, J. M.. Semi-Global Intrinsic Kinetics for Char Combustion Modeling, Combustion and Flame, 125 (2001), 3, pp. 1138-1149
  9. Liu, G. S., Niksa, S., Coal Conversion Submodels for Design Applications at Elevated Pressures, Part II. Char Gasification, Progress in Energy and Combustion Science, 30 (2004), 6, pp. 679-717
Volume 17, Issue 5, Pages1389 -1394