Coking: Energy Consumption Statistics

Coke production has been declining due to the associated environmental clean-up issues. Over 25 million tons of metallurgical coal are used to produce 18 million tons of coke. Each ton of coke produced requires 1.37 tons of coal. In the wet quench process most common in the U.S., 0.6 million Btu of steam is required per ton of coke for chemical recovery. In the dry quench process, enough heat is recovered in quenching to provide all of the steam requirements of the process and provide some steam for export as well. The energy required for the coking process, virtually all of which comes from the recovered coke oven gas itself or blast furnace gas which ultimately derives from the coke, equals 3.2 million Btu per ton of coke produced. Approximately 40% of the coke oven gas produced is returned to the coke ovens to supply this energy.About 68% of the input coal energy goes into the coke itself. Coke oven gas (exported, i.e. the 60% not needed by the coking process itself) equals 12% of the input coal energy. Recovered tars, oils, and other chemicals contain about 12% of the input energy, and about 8% is consumed as fuel for the process.

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