engleski

Possibility of energy efficiency improving of the melting furnace in secondary aluminium production

The type of a rotary furnace is often used in secondary aluminium processes. The furnace is charged with the scrap feed, which rotates to be melted under a salt layer. The furnace drum rotation enables more effective heat transfer from the hot refractory to the charge. The rotary furnace under consideration is fired by natural gas with the built-in oxy-fuel burner. Achieved higher temperatures of combustion gases allow heat transfer intensification and shortening the melting period. This paper identifies cost- effective energy savings that can be achieved through performance improvement of combustion processes in the industrial furnaces. The operating conditions having the greatest impact on the energy efficiency in an open-flame furnace are specified and the effect of oxygen-enriched air combustion on the combustion efficiency was particularly analysed. Particular attention is paid to the effect of temperature of exhaust gasses and excess oxygen on the combustion efficiency as well as the specific fuel consumption.

secondary aluminium process, rotary furnace, oxy-fuel burner, energy efficiency, combustion efficiency

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