Analiza numeryczna dopalania i schładzania gazów technologicznych z pieca elektrycznego w hutnictwie miedzi

High temperature and heavily dusted process gases with low calorific value are by-products in copper metallurgy. They must be afterburnt, cooled and dedusted before directing them to atmosphere. Low concentration of combustible components in such gases causes problems while afterburning. Dedusting process parameters require precise control of the temperature of these gases before dust collection plants. One of the most important problem related to utilization of the process gases is to dispose waste heat generated during their cooling. Rationalization of the afterburning and cooling processes needs an accurate mathematical description of occurring phenomena. It requires the elaboration of a mathematical model describing the most significant processes occurring while the utilization of the gases. The paper presents a mathematical model of afterburning and cooling of the process gases generated during reduction of slag from a fluidized-bed furnace in an electric furnace at a copper plant. The CFD Ansys software was used to elaborate this model. The model describes the most significant phenomena occurring in the afterburning chamber and water coolers surrounding its lower part. It was applied to carry out numerical simulations for exemplary mass flow of the gases from the electric furnace in order to determine the area of afterburning carbon monoxide and heat flux transferred to water during the cooling process. Calculation results obtained on the basis of the model and formulated conclusions are presented.