FURNACE COIL FINS

摘要

The present invention provides low profile, thick (“stuby”) longitudinal fins having a cross section which is a parallelogram, trapezoid or a triangle extending from 10% to 100% of a coil pass and comprising from 3 to 45 weight % of a coil in a radiant section of a furnace for thermally cracking one or more of paraffins and naphtha. The fins provide an additional surface through which heat may be transferred to the coil making the coil more efficient reducing greenhouse emissions.

主权项

1. In a furnace for thermally cracking a gaseous feed selected from the group consisting of C2-4 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 cross section which is a parallelogram 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; (iv) a weight from 3% to 45% of the total weight of the coil pass; and (v) adsorbing more radiant energy than they radiate.