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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 15a
SUMMARY:CFD investigation of the thermal field in the refractory of the blast furnace gas cleaning processes
DESCRIPTION:Blast furnace top gas contains dust particles which are removed in two stages in order to use it further as fuel gas. Coarser dust particles are removed in the first step using gravity or cyclone dustcatchers and the finer particles are removed in the second step (dry bag filter).  The temperature in the first step should be in the range of 115°C to allow optimum separation efficiency and avoid condensation of moisture. For the secondary cleaning, the temperature window is narrow that it shall neither damage the filter bags nor the gas loses its calorific value, requiring a conditioning tower in-between to cool the gas in case of surges of hot gas.  The top gas is transported to the gas cleaning plant via various refractory pipes (offtakes, uptakes, downcomer and raw gas main).  Hence the choice of the insulating refractory is critical for the smooth and optimal performance of the entire gas cleaning process. 

In this study the effect of GCP refractory is investigated through series of three-dimensional CFD models using commercial software Ansys Fluent. The physical refractories and the steel shells are included in the flow model enabling conjugate heat transfer (CHT) from the hot gas to the solid walls. As the flow field and boundary layers are predicted in better fashion the heat transfer coefficients are predicted near accurately in CFD. Performance of the refractory is studied through steady-state calculations but during blast furnace operations a peak in the gas temperature occurs for short period of time, which are analyzed through series of transient state calculations. The solid wall time scales are too low bottlenecking the computation time, which is tackled by several modelling techniques. Eventually the model is validated with an overheating (of the refractory) incident that occurred recently at a blast furnace. 
CLASS:PUBLIC
DTSTART:20230614T113000
DTEND:20230614T115000
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