Heat Balance

For heat balance calculations, reference temperature of 298K is normally selected.

Heat balance at steady state is
Heat Input = Heat output + Heat losses

In coke-making heat input is the calorific value of coal and CV of coke-oven gas burnt. CV of coal can be determined by Dulong formula as illustrated in Lecture 2.

Heat output consists of

(i)  Sensible heat in coke :
     It can be determined by

where X is mass of coke, Cp is specific heat of coke and is temperature of coke discharged from coke oven.C_pc is 0.359 Kcal/Kg^oC.

(ii) Sensible heat in coke oven gas:
      It can may be calculated by
     

where is specific heat of coke-oven gas. Its value may be taken as 0.44 Kcal/m^{3 o}C and Y is kg mole of producer gas.