FILTRATION TRAY FOR CATALYTIC CHEMICAL REACTOR

Abstract

A particle separation system for a catalytic chemical reactor.

Claims

1. A particle separation system for a catalytic chemical reactor, wherein the particle separation system comprises a plurality of filtration sections comprising overfill systems, thereby enabling particle capture while keeping the pressure drop over the separation system constant and limiting the liquid load across the system, wherein the particle separation system comprises at least one filtration tray comprising a number of basins with basin walls for collection of liquid, thereby combining sedimentation and filtration.

2. A particle separation system according to claim 1, wherein a plurality of the basins are interconnected in series of upstream and downstream basins.

3. A particle separation system according to claim 1, wherein at least one of said basin walls comprises a filtering medium.

4. A particle separation system according to claim 3, wherein said filtering medium comprises a composite.

5. A particle separation system according to claim 3, wherein an upstream basin is enabled to let liquid permeate through the filtering medium either downstream the filtration tray or to a downstream basin until said filtering medium is plugged by accumulating particles.

6. A particle separation system according to claim 3, wherein the liquid level of an upstream basin rises when the filtering medium of said tray progressively plugs, thereby exposing downstream basins to the liquid stream, whereby the basin walls function as overfill gates.

7. A particle separation system according to claim 6, wherein an open passage downstream the overfill gate is adapted to have a pressure drop which is higher than the sum of the pressure drops of all serially interconnected basins with unplugged filtering medium in a filtration tray.

8. A particle separation system according to claim 1, further comprising at least one initial sedimentation basin upstream the trays for large and heavy scale particles.

9. A particle separation system according to claim 1, wherein the trays are constructed as crates comprising at least two walls made of a screen type material.

10. A particle separation system according to claim 9, wherein the screen type material comprises catalyst or inert material, or catalyst and inert material.

11. A particle separation system according to claim 10, wherein the screen type material is adapted to allow passage of liquid, while preventing the catalyst or inert material to pass through it.

12. A particle separation system according to claim 9, wherein the two screens face each other and are oriented perpendicular to a fluid flow.

13. A particle separation system according to claim 9, wherein the crates have at least one removable side for service.

14. A particle separation system according to claim 13, wherein the removable side is fastened by means of quick releases.

15. Use of a particle separation system according to claim 1 for hydroprocessing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The invention is further illustrated by the accompanying drawings showing examples of embodiments of the invention.

[0040] FIG. 1 shows a schematic drawing of the assembly,

[0041] FIG. 2 shows the path of the gas throughout the all cycle length of the filtration tray. Substantially all gas separates from the mixture and, passing from slot 1 (11) and slot 2 (12), reaches downstream through the exit channel (13). Slot 1 and slot 2 are dimensioned such to define a certain pressure drop in the filtration basins. The design pressure drop depends upon the physical properties of the liquid; the mechanical properties of the filtering media 1 (07) and 2 (08) (including porosity and thickness); the size and other characteristics of the scale particles to be separated, the height of the overfill gate 1 (09) and gate 2 (10),

[0042] FIG. 3 shows the path of the liquid at time 0. Substantially all liquid is separated from the mixture upon pouring on the sedimentation basin 1 (01). The coarser scale particles stay on the sedimentation basin, while the liquid carrying the fine particles flows over the overfill gate (02) into the filtration basin 1 (05). The liquid permeates across the filtration medium 1 (07), which separates the fine particles, and flows into the filtration basin 2 (06). The liquid flows across the filtration medium 2 (08), which in this case does not perform any substantial action, since most of the particles were separated in the filtration medium 1. The liquid flows through the exit channel downstream,

[0043] FIG. 4 shows the path of the liquid when the particle collecting capacity of the filtering medium 1 (07) is exhausted. The liquid level raises above the overfill gate 1 (09) and escapes through the slot 1 (11). The liquid pours into the filtration basin 2 (06), and it permeates through the filtration medium 2 (08). The liquid flows through the exit channel downstream,

[0044] FIG. 5 shows the path of the liquid when the particle collecting capacities of both the filtering medium 1 (07) and 2 (08) are exhausted and the filtration tray has concluded its cycle length. The liquid level raises above the overfill gate 2 (09) and escapes through the slot 2 (12). Subsequently, it flows through the exit channel downstream. Particles are now still transported with the liquid. FIG. 5 shows an isometric view of the sedimentation basin 1 and sedimentation overfill gate 1 in one of the embodiment,

[0045] FIG. 6 shows the same of FIG. 5 with the liquid on the sedimentation basin,

[0046] FIG. 7 shows an isometric view of the filtration section, showing one embodiment of the sedimentation basin 2 (03) the sedimentation overfill gate 2 (04) the filtration basin 1 (05) and the filtration basin 2 (06),

[0047] FIG. 8 shows another isometric view of the filtration section, and

[0048] FIG. 9 shows another embodiment of the filtration media. In this embodiment there are filtration media on all walls of the filtration basins.

POSITION NUMBERS

[0049] 01 Sedimentation basin 1. [0050] 02 Sedimentation overfill gate 1 [0051] 03. Sedimentation basin 2. [0052] 04 Sedimentation overfill gate 2 [0053] 05. Filtration basin 1. [0054] 06. Filtration basin 2. [0055] 07. Filtering media. 1 [0056] 08. Filtering media 2. [0057] 09. Overfill gate 1 [0058] 10. Overfill gate 2 [0059] 11. Slot 1. [0060] 12. Slot 2. [0061] 13. Exit channel