Fluid flow inversion chamber for feed spray nozzles in FCC unit risers

Abstract

A fluid flow inversion chamber comprises a spray nozzle (3) which has a coaxial configuration of feed flow (12) and steam flow (11) streams capable of providing increased contact of the two streams within the reaction zone, and, as a consequence of the inversion of the coaxial configuration of feed flow (12) and steam flow (11) streams, avoids the formation of coke, which facilitates inspection and replacement of nozzles worn by erosion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a feed sprayer used in the state of the art.

FIG. 2A shows a fluid flow inversion chamber of a spray nozzle which is the object of this invention.

FIGS. 2B to 2D show different sealing alternatives for the spray nozzle of this invention.

FIGS. 3A to 3D show cross-section details of the fluid flow inversion chamber from FIG. 2A in perspective.

Claims

1. Fluid flow inversion chamber for feed spray nozzles in FCC unit risers comprising an external housing the upper portion of which is adapted to be a spray nozzle limited by L shaped edges of the external housing and the spray nozzle flange, whereby the L shaped edges and the flange define an interface into which a Cam profile gasket joint is provided; below the spray nozzle flange there is a contact area in which the spray nozzle is attached to an internal housing, which includes a pipe whose end is shaped like a cup, which further down contains a seal; the spray nozzle connects to a small pipe in the shape of an inverted “Y”, so that the contact area of the spray nozzle is entirely limited by the “Y”, the ends of which cross through the walls of the internal and communicate with the annular space formed between the internal and external housings, to the inside through which the steam flow pass.

2. Fluid flow inversion chamber, in accordance with claim 1, characterized by the connection of a spray nozzle to a small pipe shaped like an inverted Y, defining the sealed condition of the steam flow pipe in relation to the lower portion of the spray nozzle.

3. Fluid flow inversion chamber, in accordance with claim 1, characterized by including a point of convergence between a feed stream and a steam flow in which the feed stream flows in an internal coaxial position, while the steam flow flows in an external coaxial position.

4. Fluid flow inversion chamber, in accordance with claim 1, characterized by being mounted on the inside of the jacket, making it possible to invert, without mixing, the two fluid streams that reach the feed sprayer, suppressing the tendency to form coke in the annular space between the jacket and the lance.

5. Fluid flow inversion chamber, in accordance with claim 1, characterized by the seals provided at the points of the joints that confine the particles that cause the accumulation and facilitate cleaning points, reducing down times for maintenance.

6. Fluid flow inversion chamber, in accordance with claim 1, characterized by providing great ease of replacement that, in association with a high efficiency spray nozzle, although with an elevated risk of wear and blockage, allows cracking conversion efficiency to be maintained throughout the operational period of the FCC process.