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AssigneeNOVA Chemicals (International) S.A.
InventorsEric Clavelle, Edgar Yajure, Leslie Wilfred Benum, Edward Christopher Foy, David Eisenhawer
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The present invention provides a transfer line exchanger which is optimized for one or more objective functions of interest such as pressure drop, erosion rate, fouling, coke deposition and operating costs. The transfer line exchanger is designed by computer modeling a transfer line exchanger in which the cross section of flow path is substantially circular and modeling the operation of the transfer line under industrial conditions to validate the model design and its operation. Then iteratively the model design is deformed and the operation of the deformed part is modeled and compared to values obtained with other deformed models until the value of the objective function is optimized (e.g. at an extreme) or the change in the objective function is approaching zero.
A transfer line from an olefins cracking furnace to a quench exchanger said transfer line having an internal flow passage having a continuously smooth and differentiable perimeter which does not include abrupt, sharp changes of internal section (steps), and centerline and a smoothly increasing cross-section in the direction of flow such that the angle between the transverse normal vector and the pipe walls range from 3° to 10° such that in the 5% of the flow passage from the inlet and the outlet the ratio of the aspect ratio (AR) divided by the isoperimetric quotient (Q) (ARQ) is from 1.0 to 1.02 and over the remaining 90% of the length of the flow passage not less than 5% of the flow passage has an ARQ is from 1.02 to 1.15.
Dependencies are inferred from the claim text.