CRACKING FURNACE FOR ETHYLENE PRODUCTION Russian patent published in 2016 - IPC C10G9/20 C07C4/04 C07C11/04 F28F1/00 

FIELD: chemistry.

SUBSTANCE: invention relates to cracking furnace for ethylene production, containing: radiant section, provided with bottom burner and/or side burner and set of radiant coils, placed in radiant section in longitudinal direction. Radiant coil represents two pass coil, which has N-1 type structure, where N is natural number from 2 to 8, and collector, which has shape of reverse Y-shaped tube or palm-like pipe, which has N inputs, where N equals 2 to 4, and one output, and located on input of downstream pipe of said two pass coil, and output and of each upstream pipe of said at least two pass coil is connected to collector via bent connector. Each bent connector contains U-bend and S-bens, where one bend is connected to output of respective upstream pipe and the other bend is connected to collector input. Device by the invention can effectively reduce impact of difference in extension between upstream pipes and downstream pipes, reducing in this way stresses which it induces.

EFFECT: bend of radiant coil is eliminated, which results in increase of its service term.

18 cl, 11 dwg