Use of CFD for Effective Dust Capture in a Steelmaking Plant with an Electric Arc Furnace

摘要

Many steelmaking companies have spent much expenditure to control dust emitted from furnaces. Computational Fluid Dynamics (CFD) has been widely used to design various kinds of plants since rapid development in computer industry during last decade. This paper describes one typical example of how to improve an existing dedusting system by using CFD. Number 1 stainless steelmaking plant at Pohang Works of POSCO has three large baghouse systems to control dust from Electric Arc Furnace and UBD converter. Analysis with CFD shows that several hoods are inappropriate, air flow rate through canopy hood for EAF is insufficient and air flow rate through canopy hood for UBD converter is excessive. Modification of hood configuration and proper distribution of air flow rate to several branch ducts improve capture efficiency of dedusting system for EAF from 73 percent to 93 percent and capture efficiency of dedusting system for UBD converter from 87 percent to 98 percent. Above analysis suggest a method to improve dust capture performance of present dedusting system without any additional baghouse construction. It is expected that expenditure for construction and operation of dedusting systems is saved and the working environment becomes better.