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Published:
Jun 30, 2009Article Details
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Main Article Content
Modelling of Coal Slag flow and Layer Thickness in a High Temperature Entrained Flow Gasifier
Abstract
A 2-D model for the slag flow simulation in an entrained flow gasifier has been developed. In addition to mass, momentum and energy conservation equations, volume of fluid (VOF) equation was solved to track the liquid-gas interface. Liquid phase consists of melted coal ash particles which deposits on the wall and move downward. The gasification reaction is not considered here but it is postulated to have a mass flow through the interface towards the mass of the liquid phase. The reactor walls are usually kept cold so a temperature gradient and then a solid layer form within the slag layer. The solidification and its effect on the slag layer thickness are also considered here. Results show that, depending on the ash composition which determines the fluid’s rheological properties, the solid phase constitutes a large part of the slag layer
