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During the period of cooling and hardening from its molten state, BF slag can be cooled in several ways to form any of several types of BF slag products. Blast Furnace: Combustion material and ore are supplied from the top while an air flow is supplied from the bottom of the chamber.
Single stage furnace. A single stage furnace or 1-stage furnace means has only 1 setting (high) so whenever itâs operating, itâs running at full capacity-no matter how cold it is outside. A single stage furnace is not as efficient as every time it turns on, itâs working at full blast to produce as much energy as possible. 2-stage furnace more efficient than 1 stage So, you have probably already guessed that a 2-stage furnace has 2 levels of output-high and low.