ABSTRACT
When heat is generated as a result of an oxidation reaction, for example, combustion of a fossil fuel or a sulfide concentrate, economy can be achieved in the following ways: Improved furnace design, Improved furnace operation and Improving the oxidation process. Savings in fuel per unit of material produced in a furnace can be achieved in two ways with an improved furnace design: Increasing the size of the furnace this factor results in decreased heat losses by radiation and as a result the fuel consumption will decrease. The use of electric energy a furnace heated by burning carbonaceous fuel is thermally less efficient than a similar furnace using electric arc heating. Recovery of as much as possible of the heat generated during the reaction that would otherwise be wasted improves the heat economy of a furnace. Two types of waste heat recovery systems can be identified: the direct and the indirect systems.
