A Three Dimensional Three Phase Reactive Flow
For Simulating The Pulverized Coal Injection Into
The Channel Of The Blast Furnace Raceway
Author(s)
J. A. Castro, A. W. S. Baltazar & A. J. Silva
Abstract
The blast furnace process is a counter current flow reactor whose main purpose
is to produce hot metal. This process uses as auxiliary fuel the injection of
pulverized coal through the equipment termed the tuyere. However the injection
point in the tuyere is of summary importance for the complete combustion of the
pulverized coal, which in turn will affect the smooth blast furnace operation.
Recently, the price of premium coals became prohibitive for using in the blast
furnace, especially in Brazil, where this raw material is imported. Therefore
attempts have been made to allow the use of low quality coals partially
substituting the premium coals decreasing the production cost of steels. This
paper deals with the simulation of the pulverized injection of low-grade coals
into the channel of the blast furnace raceway. The analysis was based on a 3D
three phase mathematical model, where motion, heat transfer and chemical
reactions among chemical species were calculated based on transport equations.
Interactions among phases were computed with the help of semi-empirical
correlations. The chemical kinetics rates were adapted from the literature by
adjusting the constants for representing the industrial process. The finite volume
method implemented in a complex computational code written in Fortran 90 was
used to solve the highly non-linear system of partial differential equations in a
non-orthogonal mesh representing the geometry of a tuyere with different
injection points. The comparison between model results for temperature and gas
composition and experimental/industrial showed very close agreement. The
mathematical model proved to be useful to predict the effect of the injection of
different quality coals in the raceway and an efficient tool to evaluate new raw
materials for the blast furnace
Keywords: mathematical modelling, pulverized coal and multiphase flow.
Keywords
mathematical modelling, pulverized coal and multiphase flow.
Related Book
Other papers in this volume
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