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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.
A furnace works by blowing heated air through ducts that deliver the warm air to rooms throughout the house via air registers or grills. This type of heating system is called a ducted warm-air or forced warm-air distribution system. It can be powered by electricity, natural gas, or fuel oil.Inside a gas-or oil-fired furnace, the fuel is mixed with air and burned. The flames heat a metal heat exchanger where the heat is transferred to air.he best gas furnaces and boilers today have efficiencies over 90%. The efficiency of a fossil-fuel furnace or boiler is a measure of the amount of useful heat produced per unit of input energy (fuel). Combustion efficiency is the simplest measure; it is just the systemâs efficiency while it is running.