Fuels and Combustion
Height of coke oven is limited (say maximum upto 7 metres) mainly by the

Problem of uniform heating along its height
Structural strength of silica bricks
Buckling of ram of pusher car at the time of coke pushing
Problem in door cleaning

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Fuels and Combustion
Beehive coke oven

Gives larger yield of coke (around 85%) as compared to by-product ovens
Takes 2-3 days for coking of coal but requires no external fuel for heating
Facilitates by-products recovery
Produces coke with very poor strength

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