Ethylene Cracking Furnace

摘要

The present disclosure provides an ethylene cracking furnace, comprising at least one radiant section provided with a bottom burner and/or a side burner, and at least one set of radiant coil arranged along a longitudinal direction of the radiant section. The radiant coil is an at least two-pass coil having an N−1 structure, wherein N is preferably a natural number from 2 to 8. A manifold is arranged at an inlet end of a downstream tube of said at least two-pass coil, and an outlet end of each upstream tube of said at least two-pass coil is connected to the manifold through a curved connector. The arrangement according to the present disclosure can effectively reduce the expansion differences between the upstream tubes and the downstream tubes, and therefore reduce the stress caused thereby. Consequently, bending of the radiant coil can be avoided, thereby extending the service life of the radiant coil.

主权项

1. An ethylene cracking furnace, comprising:
one or more radiant sections, at least one radiant section comprising a bottom burner and/or a side burner, and one or more radiant coils arranged along a longitudinal direction of the radiant section, wherein the radiant coil is an at least two-pass coil having one downstream tube and N upstream tubes in two adjacent passes, N being an even number from 2 to 8; a manifold is connected to an inlet end of the downstream tube, and to an outlet end of each of the N upstream tubes through a curved connector, and the inlet end of the downstream tube is located below an outlet end thereof, so that the manifold is arranged below the downstream tube.