WTZ Gmbh

This coke can either be fuel grade (High in sulfur (S) and metals) or anode grade (Low in sulfur and metals). The raw coke directly out of the coker is often referred to as “Green Coke“. In this context, “Green” means raw or unprocessed. The further processing of green coke by calcining in a rotary kiln removes residual volatile hydrocarbons from the coke. The calcined petroleum coke can be further processed in an anode baking oven in order to produce anode coke of the desired shape and physical properties. The anodes are mainly used in the Aluminum (Al) and Steel industry.

Petcoke is over 90% carbon (C) and emits 5% to 10% more Carbon Dioxide (CO2) than coal on a per unit of energy basis when it is burned. As petcoke has a higher energy content, petcoke emits between 30% and 80% more CO2 than coal per unit of weight. The difference between coal and coke in CO2 production per unit of energy produced depends upon the moisture in the coal, which increases the CO2 per unit of energy–heat combustion) and on the volatile hydrocarbons in coal and coke, which decrease the CO2 per unit of energy.