Patent ID: 9132409
Filing Date: 2015-09-15
Classification: B01J,C07C,C10G,F28D,F28F

Abstract:
1. In a furnace for thermally cracking a gaseous feed selected from the group consisting of C 2-4 alkanes and naphtha, fed to one or more process coils in the furnace radiant section having combustion gasses passing there through comprising one or more of floor and wall burners and having radiant refractory walls the improvement comprising using in said radiant section one or more process coils comprising one or more passes, having a circular cross section and from 1 to 8 substantially linear longitudinal vertical fins having a triangular cross section on the external surface, said fins having: (i) a length from 10 to 100% of the length of the coil pass; (ii) a base having a width from 3% to 30% of the coil outer diameter, which base has continuous contact with, or is integrally part of the coil pass; (iii) a height from 10% to 50% of the coil outer diameter; (v) a weight from 3% to 45% of the total weight of the coil pass; and (vi) adsorbing more radiant energy than they radiate.