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Recuperator
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==Use in metallurgical furnaces== Recuperators have also been used to recover heat from waste gasses to preheat combustion air and fuel for many years by metallic recuperators to reduce energy costs and [[carbon footprint]] of operation. Compared to alternatives such as regenerative furnaces, initial costs are lesser, there are no valves to be switching back and forth, there are no induced-draft fans and it does not require a web of gas ducts spread up all over the furnace. Historically the recovery ratios of recuperators compared to [[regenerative burner]]s were low. However, recent improvements to technology have allowed recuperators to recover 70-80% of the waste heat and pre-heated air up to {{convert|850|-|900|Β°C}} is now possible.
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