Process of Calcining Petcoke

1. www.kincgroup.com Process of Calcining Petcoke Calcining of petroleum coke is a three-step process which includes drying, devolatisation, and densification. The process of petcoke calcining is a temperature-time function, that is conducted in an oxygen-deficient atmosphere. Important variables here are air addition rate, heating rate, and final calcination temperature. In order to obtain calcined petcoke properties that is required by graphite and activated carbon industries, the petcoke needs to be subjected to temperature of 1150 to 1350-degree Celsius or even higher in order to achieve conductivity and density for the calcined petcoke. Rotary kiln The petcoke is fed into the refractory-lined rotary kiln where volatiles are driven- off in the process of calcining the petcoke in an oxygen-deficient atmosphere. Air

2. www.kincgroup.com could be injected then through the rotary kiln shell in order to burn a part of the volatile matters in the rotary kiln thus providing usable heat to rotary kiln. Cooling After the calcined petcoke is discharged from the rotary kiln, the petcoke is then cooled down in rotary cooler. In the feeder of the rotary cooler, water is then sprayed on calcined petcoke to cool down the petcoke to an acceptable temperature. That water is thus evaporated in the whole process. Afterburner The exhaust gas from the kiln is oxygen-deficient and it contains volatile the matters that are released in the rotary kiln. The rotary kiln’s exhaust gas is directed to the afterburner and air is then injected to burn the dust and volatiles. Waste heat recovery boiler is then used to produce the steam from heat that is contained in the exhaust gas of the afterburner.