Abstract
An incompressible gas phase three dimensional (3D) computational fluid dynamics (CFD) model with turbulence and radiation was developed to investigate hydrodynamics of a low temperature furnace (LTF) for polyacrylonitrile (PAN)-based fiber carbonization. Thirty PAN-fiber tows moving at a constant linear speed emitted off-gas and their porosity increased during carbonization. The CFD model included off-gas mass flow rates of eight species with respect to temperature, which were treated as a source term from the tows. Velocity, temperature, and concentration profiles along the furnace length were examined according to three duct positions (e.g., front, middle and rear sides of LTF). The off-gas residence time, dead-zone (or stagnant gas region) ratio, and temperature uniformity were used as performance criteria of LTF. An optimal duct position was determined on the front side of LTF considering the three performance criteria.
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