August 2013

Process/Plant Optimization

Achieve uniform heat flux in a coker furnace

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..

Gupta, A., Patil, R. C., Mishra, V. P., Das, A. K., Reliance Industries, Ltd.

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. The loss in heat transfer is compensated by the increased temperature differential between the tube’s outer surface and the process fluid temperature. Similarly, the higher resistance to flow increases pressure drop across the furnace tubes.

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