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Energies 2015, 8(5), 3370-3385; doi:10.3390/en8053370

Effects of Design/Operating Parameters and Physical Properties on Slag Thickness and Heat Transfer during Coal Gasification

School of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, Korea
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Academic Editor: Mehrdad Massoudi
Received: 12 March 2015 / Revised: 19 April 2015 / Accepted: 21 April 2015 / Published: 24 April 2015
(This article belongs to the Special Issue Recent Advances in Coal Combustion and Gasification)
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Abstract

The behaviors of the slag layers formed by the deposition of molten ash onto the wall are important for the operation of entrained coal gasifiers. In this study, the effects of design/operation parameters and slag properties on the slag behaviors were assessed in a commercial coal gasifier using numerical modeling. The parameters influenced the slag behaviors through mechanisms interrelated to the heat transfer, temperature, velocity, and viscosity of the slag layers. The velocity profile of the liquid slag was less sensitive to the variations in the parameters. Therefore, the change in the liquid slag thickness was typically smaller than that of the solid slag. The gas temperature was the most influential factor, because of its dominant effect on the radiative heat transfer to the slag layer. The solid slag thickness exponentially increased with higher gas temperatures. The influence of the ash deposition rate was diminished by the high-velocity region developed near the liquid slag surface. The slag viscosity significantly influenced the solid slag thickness through the corresponding changes in the critical temperature and the temperature gradient (heat flux). For the bottom cone of the gasifier, steeper angles were favorable in reducing the thickness of the slag layers. View Full-Text
Keywords: ash deposition; coal gasification; heat transfer; slag flow; syngas ash deposition; coal gasification; heat transfer; slag flow; syngas
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ye, I.; Oh, J.; Ryu, C. Effects of Design/Operating Parameters and Physical Properties on Slag Thickness and Heat Transfer during Coal Gasification. Energies 2015, 8, 3370-3385.

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