Solution:   

Basis of calculation: 1000 kg coal

i) Amount of coke /ton of coal

Ash balance is used to determine the amount of coke. Let x kg is amount of coke.

 

coke Answer.

ii)  Amount of coke oven gas can be calculated by performing C balance

C from coal= C in tar+ C in coke + C in Cokes oven gas

Let y kg is the amount of Cokes oven gas

By solving we get y= 15.357 kg mole

iii) Sulphur distribution

            (a) fraction of S in coke

            (b) fraction of S in coke oven gas

iV) To calculate amount of air leaked in to coke oven.  balance is to be done.  is inert. Let Z kg mole is amount of air leaked.

In this problem air is moist. We have to find composition of moist air. It follows drom Dalton’s law;

 

Where p is partial pressure.

 

pN₂ + pO₂  +  RH x pSH₂O   = 750

 Substituting the value of RH and pSH₂O, we get after simplification

and  

 

N₂ from coal+ N₂ from air = N in coke + N in tar+ N₂ in coke oven gas

 

Solving :  Z=20.84 kg air leaked Ans.

V.        Calorific value calculation

ICoal. First we have to convert ultimate analysis of moist coal to dry coal. (This is illustrated in Lecture 3).