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Open AccessFeature PaperArticle

Influence of Air Infiltration on Combustion Process Changes in a Rotary Tilting Furnace

1
Department of Thermal Technology and Gas Industry, Institute of Metallurgy, Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Letna 9, 042 00 Kosice, Slovakia
2
Department of Chemical and Biochemical Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37 Bratislava, Slovakia
3
Department of Process Technique, Faculty of Manufacturing Technologies of the TU of Kosice with a Seat in Presov, Technical University of Kosice, Sturova 31, 080 01 Presov, Slovakia
*
Author to whom correspondence should be addressed.
Processes 2020, 8(10), 1292; https://doi.org/10.3390/pr8101292
Received: 24 September 2020 / Revised: 6 October 2020 / Accepted: 13 October 2020 / Published: 15 October 2020
(This article belongs to the Special Issue Progress in Energy Conversion Systems and Emission Control)
Air infiltration into the combustion chambers of industrial furnaces is an unwanted phenomenon causing loss of thermal efficiency, fuel consumption increase, and the subsequent increase in operating costs. In this study, a novel design for a rotary tilting furnace door with improved construction features is proposed and tested experimentally in a laboratory-scale furnace, aimed at air infiltration rate reduction by decreasing the gap width between the static furnace door and the rotating body. Temperatures in the combustion chamber and oxygen content in the dry flue gas were measured to document changes in the combustion process with the varying gap width. Volumetric flow values of infiltrating air calculated based on measured data agree well with results of numerical simulations performed in ANSYS and with the reference calculation procedure used in relevant literature. An achievable air infiltration reduction of up to 50% translates into fuel savings of around 1.79 to 12% of total natural gas consumption of the laboratory-scale furnace. The average natural gas consumption increase of around 1.6% due to air infiltration into industrial-scale furnaces can thus likewise be halved, representing fuel savings of almost 0.3 m3 per ton of charge. View Full-Text
Keywords: air infiltration; rotary furnace; combustion; energy savings; thermal efficiency air infiltration; rotary furnace; combustion; energy savings; thermal efficiency
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MDPI and ACS Style

Dzurňák, R.; Varga, A.; Jablonský, G.; Variny, M.; Atyafi, R.; Lukáč, L.; Pástor, M.; Kizek, J. Influence of Air Infiltration on Combustion Process Changes in a Rotary Tilting Furnace. Processes 2020, 8, 1292.

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