A delayed coker unit thermally cracks vacuum residue (VR)
and converts it into products like liquefied petroleum gas
(LPG), naphtha, gasoil and petroleum coke. A majority of the
thermal cracking takes place in the coke drum. Coke formed
during the cracking reactions is deposited on the inner tube
surface. As the coke layer grows, resistance to heat transfer
increases. Result: More fuel firing is needed
to maintain the furnace outlet temperature.