| 摘要 |
A METHOD FOR HEATING AND/OR MELTING A CHARGE SUCH AS ALUMINUM IN A FURNACE (1) USING HEAT GENERATED BYCOMBUSTION TO RADIATIVELY HEAT THE CHARGE THROUGH A LAYER OF PROTECTIVE GAS WHEREIN CONILIUSTION REACTION PRODUCTS GENERATED BY THE COMBUSTION ARE EXHAUSTED FROM A LOWER LEVEL (5) WITHIN THE FURNACE (1), AND, DURINGMELTING, THE PROTECTIVE GAS LAYER HAS A HIGHER UPPER BOUNDARY (9) THAN DURING A SUBSEQUENT HEATING PERIOD, ENABLING REDUCED NOX GENERATION, LOWER FUEL AND OXYGEN CONSUMPTION AND REDUCED REFRACTORY CORROSION BY AVOIDING FURNACE GAS FLOW THROUGH THE HIGH TEMPERATURE UPPER FURNACE REGION.
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