Steam cracking method and plant using controlled injection of solid particles into a quenching exchanger
AssigneeInstitut Francais Du Petrole Procedes Petroliers et Petrochimques Eric Lenglet
InventorsEric Lenglet, Paul Broutin, Jean-Pierre Burzynski, Herve Cazor, Roland Huin
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Abstract
A facility and a process for steam cracking include controlled injection of solid particles into a transfer line exchanger (3). The particles are injected via injection lines, numbering between 1 and 8, just upstream of an impact-diffuser (6) comprising solid surfaces disposed on either side of the line for transfer of the cracked gases to the exchanger; this impact-diffuser is located in the inlet cone (2) of the exchanger, is permeable to the gases via a plurality of passages and at least 70% opaque viewed from the transfer line.
Claims22
A facility for steam cracking of hydrocarbons comprising at least one cracking furnace provided with at least one cracking zone with at least one pyrolysis tube connected downstream by means of a transfer line (1) to an inlet cone (2) of a transfer line exchanger (3) for the effluent of this zone with an inlet tube plate (5), the facility also comprising at least one injection line (I) for solid particles for at least partial removal, carried out in line, of the coke deposited in the exchanger tubes, said facility comprises:
- a particle impacter-diffuser (6), comprising solid surfaces disposed opposite the transfer line (1), in the interior of said inlet cone (2), said impacter-diffuser being permeable to gases via a plurality of gas passages, but at least 70% opaque seen from said transfer line (1) situated upstream,
- said injection line (I) opening out into a point of introduction of the particles, situated at a distance L upstream of the impacter-diffuser, not exceeding 2.5 times the diameter D of the tube plate of the transfer line exchanger.
Dependencies are inferred from the claim text.