An aluminium smelting process exhausting hot combustion gases from a natural gas fired combustion chamber.

Heat is recovered from the hot combustion gases at temperatures of up to 600 oC and transferred, via an air to thermal oil, stainless steel heat exchanger, to a thermal oil ring main circuit. This thermal oil ‘run-around system’, operating at 270 oC, is then used to transfer heat to pre-heat the combustion air for the furnace gas burner system. A 2 year return on investment was achieved.

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