Furnace coil with protuberances on the external surface
AssigneeNova Chemicals (International) S. A.
InventorsGrazyna Petela, Leslie Wilfred Benum
Life of this patent
Estimating the term…
Abstract
The efficiency of heat transfer to a furnace tube or coil in a furnace for cracking ethane, propane or naphtha feedstocks, or a mixture thereof may be improved by providing protuberances on the surface of the tube or coil having i) a maximum height from 3 to 15% of the coil outer diameter, ii) a contact surface with a coil, or a base, which area is 0.1%-10% of the coil external cross section area, and iii) a geometrical shape which has a relatively large external surface containing a relatively small volume.
Claims21
In a furnace for thermally cracking a feed selected from the group consisting of C2-4 alkanes, and naphtha, the improvement comprising using in the furnace radiant section one or more process coils comprising one or more passes, having the external surface augmented with protuberances, the said protuberances having:
- i) a maximum height from 3 to 15% of the coil outer diameter;
- ii) a contact surface with a coil, or a base, which area is 0.1%-10% of the coil external cross section area;
- iii) a geometrical shape which has a relatively large external surface containing a relatively small volume.
Dependencies are inferred from the claim text.