Patent ID: 6464949
Filing Date: 2002-10-15
Classification: C10G,F28D,F28F

Abstract:
A hydrocarbon steam-cracking unit that contains pyrolysis pipes, the unit having at least one furnace with at least one multitube quenching exchanger (3) having an input tube plate (5), and having a number of lines (4) extending through the tube plate (5) for introducing decoking fluids selected from the group consisting of air, water vapor, and air/vapor mixtures, said quenching exchanger comprising an input cone (2) connected downstream of a transfer pipe (1), said pipe being connected to the input cone, the steam-cracking unit comprising an impact separator (14) that includes solid surfaces that are placed opposite the transfer pipe (1), said impact separator having a periphery and being at least 50% opaque when viewed from said transfer-pipe (1) located upstream of the impact separator, wherein the impact separator (14) is placed inside the input cone in such a way that there is free passage between the periphery of the impact separator (14) and the cone of at least 40 mm around the periphery of the impact separator.