Method and installation for steam cracking hydrocarbons
AssigneeProcedes Petroliers et Petrochimiques
InventorEric Lenglet
Life of this patent
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Abstract
A method and apparatus for steam cracking hydrocarbons in a furnace (10) having rectilinear single-pass tubes (12) which are interconnected at their outlet ends by a manifold (18) within which the steam cracking effluents are subjected to limited pre-quenching by injection of a cooler gaseous medium, with the effluents then being conveyed to quenching means (22). The invention serves in particular to increase the yield of hydrocarbon steam cracking installations.
Claims18
A method of steam cracking hydrocarbons to produce ethylene and other unsaturated low hydrocarbons comprising:
- causing a feedstock of steam and hydrocarbons to pass at high speed through a furnace having a plurality of single-pass tubes;
- subjecting the effluents from the tubes to quenching in quenching means outside the furnace, said tubes being connected by an outlet manifold and a transfer duct to the quenching means;
- cooling said effluents in the outlet manifold, thereby obtaining a limited pre-quenching of the effluents by not more than about 160.degree. C. in the outlet manifold;
- and performing the pre-quenching of the effluents by injecting a relatively low flow rate of gas at a temperature lower than the temperature of the effluents into the upstream end of said outlet manifold.
A method of steam cracking hydrocarbons to produce ethylene and other unsaturated low hydrocarbons comprising:
- causing a feedstock of steam and hydrocarbons to pass at high speed through a furnace having a plurality of single-pass tubes;
- subjecting the effluents from the tubes to quenching in quenching means outside said furnace, said tubes being connected by an outlet manifold and a transfer duct to the quenching means;
- and cooling the effluents in the outlet manifold, thereby obtaining a limited pre-quenching of the effluents by not more than about 160.degree. C. in said outlet manifold whereby said steam cracking comprises splitting said hydrocarbon feedstock into two halves, causing said split feedstock to flow in opposite directions along adjacent tubes, and pre-quenching the outlet effluents of each half of said split feedstock by exchanging heat with the other half being admitted into the furnace.
An installation for steam cracking hydrocarbons comprising;
- a cracking furnace having a plurality of single-pass tubes through which a feedstock of hydrocarbons and steam pass at high speed, an outlet manifold connected to said tubes, a transfer duct connecting said outlet manifold to quenching means outside the furnace, means for performing a limited pre-quenching of the effluents by not more than about 160.degree. C. in said outlet manifold, indirect quenching means connected to said transfer duct and a cyclone at the outlet of said indirect quenching means for separating said solid particles from the effluents, wherein said feedstock injected into the outlet manifold comprises erosive solid particles.
An installation for steam cracking hydrocarbons comprising:
- a cracking furnace having a plurality of single-pass tubes through which a feedstock of hydrocarbons and steam pass at high speed, an outlet manifold connected to said tubes, a transfer duct connecting said outlet manifold to quenching means outside the furnace, and means for performing a limited pre-quenching of the effluents by not more than about 160.degree. C. in said outlet manifold, wherein said cracking furnace comprises two intermeshed bundles or parallel single-pass tubes, the tubes of each bundle being connected at their ends to an inlet manifold and an outlet manifold respectively, the tubes of each bundle passing through the inlet manifold of the other bundle.
Dependencies are inferred from the claim text.