1. By product coke ovens are surrounded by air. There may occur leakage of air in the oven.

Consider a coke‐ oven surrounded by moist air, (The air is at 750 mm

Hg pressure and 26 °C temperature). The relative humidity of air is 40%. It

carbonizes coal of the composition (Wt%): C:76.1, H: 4.6, N:2.3, S:1.9,O: 2.5,

H2O : 6.3 and ash 6.3. The following products and by-products are produced:

Product: Coke (Wt %): C: 85.2, H: 1.9, O: 2.2, N : 0.8, S: 1.2 and Ash 8.7

By –product: (a) Coke oven gas (vol. % dry basis)

C6H6 :1.1,C2H4 :2.7,CH4 : 4.4, CO: 1.7, CO2 :1.3, H2 : 36.5, N2 : 6.9, O2 : 2, H2S :2.1 and NH3

:1.3

(b) Tar (40 kg/ton of coal) analysis (Wt %):C:89.4, H: 4.5, N: 1.1.

and incombustibles Rest.

Calculate per ton of Coal:

1.Amount of coke /ton of coal

2.Amount of coke‐oven gas

3.Fraction of S in coke and coke oven gas

2. Producer gas/ coke oven plant:

3.Producer gas /Water gas plant efficiency:

.

4. Coal Combustion problem: