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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