Sand separator vessel perforated replaceable insert apparatus and method

Patent metadata

Field	Value
Publication number	US-2017128958-A1
Application number	US-201615337247-A
Country	US
Kind code	A1
Filing date	Oct 28, 2016
Priority date	Nov 5, 2015
Publication date	May 11, 2017
Grant date	—

Abstract

A perforated replaceable insert for a sand separator vessel in a digester feed system where the perforations have at least a width and a length. The perforations are aligned columns and rows, with the columns being positioned to be parallel to a line formed by the tangent of the conical axis.

First claim

What is claimed is:

1 . A sand separator vessel to separate entrained liquor into solid particles and an essentially solid particles free liquor stream comprising:
at least an upper section of a cylindrical portion and at least a lower section; a tangential inlet to the upper section of the cylindrical portion to accept the entrained liquor; an outlet at the top of the upper section of the cylindrical portion to discharge an essentially solid particles free liquor; an outlet at the bottom of the lower section to discharge the solid particles; the lower section having a conical portion; the conical portion having a conically shaped replaceable insert surrounded by a solid particles collection region; wherein the conically shaped replaceable insert is a metal plate with perforations in the metal plate, and the metal plate is formed into a conical shape sized to fit within the conical portion of the lower section; the perforations in the metal plate are slots having a length “L” and a width “W”; the slots are arranged in a pattern of rows and columns such that the columns of slots are parallel to a line formed by the tangent of the conical axis of the replaceable insert.

2 . The sand separator vessel of claim 1 wherein the solid particles are sand.

3 . The sand separator vessel of claim 2 wherein the slots have a gradually changing width “W.”

4 . The sand separator vessel of claim 2 wherein the slots have a gradually changing length “L.”

5 . The sand separator vessel of claim 3 wherein the slots have a gradually changing length “L.”

6 . The sand separator vessel of claim 1 wherein the replaceable insert has a hard coating applied to the top 25% to 30% of the replaceable insert.

7 . The sand separator vessel of claim 1 wherein the metal plate of the replaceable insert has an increased thickness for the top 25% to 30% of the replaceable insert.

8 . The sand separator vessel of claim 7 wherein the metal plate is 2 mm to 8 mm thicker.

9 . The sand separator vessel of claim 2 wherein the maximum width of the slot is 6 mm.

10 . A perforated replaceable insert for a separation device comprising:
a metal plate having a conical shape, and wherein the conical shape has a larger opening at one end and a smaller opening at the opposite end, and multiple perforations in the conically shaped metal plate, wherein each of the multiple perforations has at least a length “L” and a width “W,” and the multiple perforations form a pattern of columns and rows in the metal plate, wherein the columns are all placed in the metal plate and the columns of perforations are parallel to a line formed by the tangent of the conical axis of the replaceable insert.

11 . The perforated replaceable insert of claim 10 , wherein said insert is suitable for use in a sand separator vessel.

12 . The perforated replaceable insert of claim 10 , wherein the perforations are slots.

13 . The perforated replaceable insert of claim 10 , wherein the width “W” of the perforations gradually changes from one end to the opposite end while the length “L” does not change.

14 . The perforated replaceable insert of claim 10 , wherein a hard coating is applied to 25% to 30% of the conically shaped metal plate at the end having the larger opening.

15 . The perforated replaceable insert of claim 10 , wherein the conically shaped metal plate is thicker at the end having the larger opening.

16 . The perforated replaceable insert of claim 10 , wherein the width “W” of the perforations is no greater than 6 mm.

17 . The sand separator vessel of claim 7 , wherein the thickness of the metal plate is increased by 10% to 20%.

Assignees

• Andritz Inc

Inventors

• Hunt Tyson B
• David Alexandre

Classifications

• B04C5/04

  Tangential inlets · CPC title

• B04C5/181 Primary

  Bulkheads or central bodies in the discharge opening · CPC title

• D21C11/00

  Regeneration of pulp liquors {or effluent waste waters} · CPC title

• B04C5/085 Primary

  with wear-resisting arrangements · CPC title

• D21F1/62

  Sand traps · CPC title