The reconstruction of a furnace with a rolling hearth for the heat treatment of welded metal struc tures is described. The primary heating system based on twelve high speed recuperative burners is supple mented by a recirculation system for the exhaust gas, which is heated in a portable chamber. That ensures uni form temperature distribution in the furnace's working chamber, to within ±10°C. The introduction and debugging of the furnace is considered.
Presently, the furnace stock of the ferrous metallurgy and heavy engineering industry comprises approximately 55%-60% of units with service life over 30-50 years. Considering that constructing new furnaces requires significant financial investments and reduces production over a long period, the technical re-equipment and modernization of units in accordance with modern requirements have become widely adopted. This paper presents an appropriate methodology for the technical re-equipment and modernization, one that enables reducing time and achieving the optimal result with the lowest cost.
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