Process for the positioning of a corrosion-resistant coating on a wall of an item of equipment of a FCC unit

Patent metadata

Field	Value
Publication number	US-11266967-B2
Application number	US-201615773497-A
Country	US
Kind code	B2
Filing date	Nov 2, 2016
Priority date	Nov 4, 2015
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

The invention relates to a process for the positioning of a corrosion-resistant coating on an internal or external metal wall (20) of a fluid catalytic cracking unit chamber, comprising:(i) the shaping of a metal anchoring structure (10) formed from a plurality of strips (12) assembled in pairs by joining assembly portions (121, 122) so as to form a plurality of cells (14), the anchoring structure comprising a plurality of fastening tabs (16) integral with strip portions other than assembly portions,(ii) the fastening of said anchoring structure (10) by welding the free edge (18) of a part at least of the fastening tabs to the metal wall (20), defining a space between a longitudinal edge (12b) of an anchoring structure and the metal wall,(iii) the insertion of a composite material into the cells (14) from the metal wall (20) and at least up to the upper longitudinal edge (12a) of each strip.

First claim

The invention claimed is:

1. A process for the positioning of a corrosion-resistant coating on a metal wall to be protected of a fluid catalytic cracking unit, comprising:
(i) the shaping of a metal anchoring structure,
in which the anchoring structure is formed from a plurality of strips connected in pairs so as to form a plurality of cells between two adjacent strips, each strip being divided along its length into a plurality of portions, including at least one series of assembly portions connected to a series of assembly portions of an adjacent strip, each strip exhibiting a first longitudinal edge and a second longitudinal edge, each second longitudinal edge exhibiting a plurality of fastening tabs of a predetermined height, each fastening tab being integral with a strip portion other than an assembly portion, wherein the fastening tabs are distant from and not contiguous to the assembly portions;
in which, during this shaping stage, the second longitudinal edges of the strips of the anchoring structure are adapted so that a free edge of each tab of the plurality of fastening tabs is in contact with the metal wall and so that a free space is defined between the the second longitudinal edge and the metal wall,

(ii) the fastening of the anchoring structure to the metal wall, during which, for at least a part of the plurality of fastening tabs, the free edge of the fastening tabs is welded to the metal wall,
(iii) the insertion of a composite material:
into the cells of the anchoring structure from the metal wall and at least up to the first longitudinal edge of each strip,
into the space separating the second longitudinal edge of each strip of the anchoring structure and the metal wall, the height of each fastening tab being sufficient for the composite material to fill this space, wherein the anchoring structure shaped during stage (i) exhibits hexagonal cells exhibiting an even number of sides, and at least two fastening tabs integral with two opposite sides of each hexagonal cell, in which, during the fastening stage (ii), two opposite fastening tabs of each hexagonal cell are welded to the metal wall.

2. The process for the positioning of a corrosion-resistant coating as claimed in claim 1 , in which the anchoring structure shaped during stage (i) exhibits fastening tabs, the length of the free edge of which is less than the length of a side of a cell of the structure.

3. The process for the positioning of a corrosion-resistant coating as claimed in claim 1 , in which, during the fastening stage (ii), the welds are produced over the entire length of the free edge of a fastening tab.

4. The process for the positioning of a corrosion-resistant coating as claimed in claim 1 , in which, during the fastening stage (ii), the welds are produced on one face only of a fastening tab.

5. The process for the positioning of a corrosion-resistant coating as claimed in claim 1 , in which the anchoring structure shaped during stage (i) exhibits cells exhibiting an even number of sides, each hexagonal cell exhibiting at least two opposite sides formed by assembly portions of the strips of anchoring structure and fastening tabs integral with the other sides, in which, during the fastening stage (ii), all the fastening tabs of each cell are welded to the metal walls.

6. The process for the positioning of a corrosion-resistant coating as claimed in claim 1 , in which:
the first longitudinal edge of each strip of the anchoring structure shaped during the stage (i) is formed, before the shaping, from a succession of straight sections which are parallel to a plane defined by the second longitudinal edge, bottom sections distant from the second longitudinal edge by a distance h alternating with top sections distant from the second longitudinal edge by a distance H greater than the distance h, at least a part of the bottom sections forming the first edge of a part at least of the assembly portions so that, when two adjacent strips are assembled, each assembly portions of a strip comprises a first longitudinal edge distant from its second longitudinal edge by a distance different from the distance separating the first longitudinal edge from the second longitudinal edge of the assembly portion of the adjacent strip with which it is assembled, at least over a part of the length of the assembled assembly portions,
during the stage (iii) of insertion of the composite material, the composite material fills the cells from the metal wall and at least up to the top sections of the first longitudinal edges of the strips of the anchoring structure.

7. The process for positioning a corrosion-resistant coating as claimed in claim 1 , in which:
the first longitudinal edge of each strip of the anchoring structure shaped during stage (i) exhibits, before the shaping, a plurality of delimitation tabs integral with strip portions other than assembly portions, each delimitation tab exhibiting a delimitation edge distant by a predetermined distance (D) from a plane defined by the first longitudinal edge,
during the stage (iii), the composite material is applied over a thickness sufficient to cover or be flush with the delimitation edge of the delimitation tabs.

8. A metal wall equipped with a corrosion-resistant coating capable of being positioned according to the process as claimed in claim 1 , the wall exhibiting a face covered with a corrosion-resistant coating comprising:
a cellular anchoring structure welded to the wall,
a composite material filling the cells of the anchoring structure,

in which:
the anchoring structure is formed from a plurality of strips assembled in pairs so as to form a plurality of cells between two adjacent strips, each strip being divided along its length into a plurality of portions, including at least one series of assembly portions assembled with a series of assembly portions of an adjacent strip, each strip exhibiting a first longitudinal edge and a second longitudinal edge, each second longitudinal edge exhibiting a plurality of fastening tabs, each fastening tab being integral with a strip portion other than an assembly portion, a free edge of each tab of the plurality of fastening tabs being in contact with the metal wall in order to define a space between the second longitudinal edge and the metal wall, the free edge of at least some of the fastening tabs being welded to the metal wall,
the composite material fills the cells from the metal wall and at least up to the first longitudinal edge of each strip and fills in the space separating the second longitudinal edge of each strip of anchoring structure and the metal wall, the height of each fastening tab being sufficient for the composite material to fill the space.

9. A chamber of a fluid catalyst cracking unit, characterized in that it comprises comprising at least one inner or outer metal wall as claimed in claim 8 .

Assignees

• Total Raffinage Chimie

Inventors

• Decker Sébastien

Classifications

• C10G75/00

  Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general (C10G7/10, C10G9/16 take precedence) · CPC title

• B01J19/02 Primary

  Apparatus characterised by being constructed of material selected for its chemically-resistant properties · CPC title

• B01J8/1872 Primary

  Details of the fluidised bed reactor (B01J8/1836 takes precedence) · CPC title

• C10G11/18

  according to the "fluidised-bed" technique · CPC title

• F27D1/141

  Anchors therefor · CPC title