Fuels and Combustion
Undercharging of coal in the by-product coke ovens results in

Increase in its throughput
Decrease in the c.v. of coke oven gas
Increase in the c.v. of coke oven gas
No change in the c.v. of coke oven gas

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Fuels and Combustion
Beehive coke oven

Facilitates by-products recovery
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
Produces coke with very poor strength

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