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Coke: it carries both sensible heat and potential energy. Sensible heat is the amount of heat in coke at a given temperature.Potential energy can be obtained by combustions. Sensible heat cannot be used because coke cannot be used directly in blast furnace. It is to be quenched and then stored for future use.
Wet quenching is employed to cool coke from to In the wet quenching water is vaporized and released into the atmosphere. Here, the sensible heat of red-hot coke is converted into sensible heat of water vapor and is lost unutilized. Airborne coke dust is also produced.
Coke oven gas: it also contains potential energy and sensible heat. One should consider usage of sensible heat and potential energy of coke oven gas. Gas existing from coke oven contains, among gaseous constituents, dust. Hence, cleaning is required which may lead to loss of sensible heat.
Losses: at high temperature, losses are unavoidable. Moreover, coal in the coke-ovens is heated indirectly. Design of coke oven with high quality thermally conducting material may reduce heat losses.

The above energy analysis shows that sensible heat of coke, which is lost in wet quenching, should be re-used.It should also be noted that coke is the main source of thermal and chemical energy in the blast furnace iron making. Loss of sensible heat due to quenching is of coke. In an earlier calculation it is shown that approximately 6600 tons of coke would be required to produce 10,000 tons of steel. Loss of sensible heat to produce 6600 tons of coke would be of the order of .There is every reason to re-use this amount of heat.

Re-use of sensible heat needs to develop a technology which can “capture” the heat and “transfer” the captured heat for some useful work. Dry quenching is the technology which can capture the heat and this heat can be made to re use.