Method for steam cracking hydrocarbons
AssigneeProcedes Petroliers et Petrochimiques
InventorEric Lenglet
Life of this patent
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Abstract
A method of steam cracking hydrocarbons in a steam cracking furnace (10) having tubes (12) connected to indirect quench menas (16) for the gaseous effluent leaving the furnace, the method consisting in allowing a layer of hard coke to form on the inside walls of the furnace tubes (12) and then in injecting a small quantity of solid erosive particles into the steam and hydrocarbon feedstock to be cracked, with the particles being separated from the gaseous effluent in a cyclone (28) provided at the outlet from the indirect quench means. The invention serves in particular to enable a steam cracking installation to operate continuously.
Claims15
A method of steam cracking hydrocarbons in an installation comprising at least one steam cracking furnace having tubes and indirect quench means for the gaseous effluents leaving the furnace, said method comprising:
- a) feeding a mixture of steam and hydrocarbon feedstock through the tubes and quench means so as to form a layer of coke in the tubes of mean thickness sufficient to protect the walls of the tubes from the erosive action of solid particles;
- and thereafter
- b) feeding a mixture of steam and hydrocarbon feedstock through the tubes coated with the coke layer formed in step (a) while simultaneously injecting into the tubes a flow of gas containing erosive solid particles in sufficient quantity and of sufficient mass and dimension to substantially limit by erosive action further deposition of coke while preserving the coke layer formed in step (a).
Dependencies are inferred from the claim text.