| 摘要 |
Exhaust heat from a slot furnance is recouped by a preheater unit consisting of a pipe mounted within a flue into which exhaust gasses pass through a slot, the flue being formed by a three-sided structure mounted on the outside wall of the furnance above the slot. Combustion air is supplied to the preheater pipe in a direction tangential and transverse to the pipe axis, and a passage leading from the preheater pipe to the furnace burner or burners is provided with means for controlling the temperature and volume of the preheated air supplied thereto.
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