Classification system using fluidized bed

Patent metadata

Field	Value
Publication number	US-12337331-B2
Application number	US-202218018455-A
Country	US
Kind code	B2
Filing date	Jun 17, 2022
Priority date	Nov 2, 2021
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

A classification system using a fluidized bed according to the present invention includes: a fluidized bed classifier supplied with powder containing particles of different sizes, which entrains the powder into the fluidized gas, and then discharges coarse powder through a coarse powder outlet positioned in its lower portion. The system further includes a cyclone communicating with an upper portion of the fluidized bed classifier, which collects and discharges fine powder contained in the fluidized gas transferred from the fluidized bed classifier to a fine powder outlet positioned in its lower portion. Additionally, the system further includes a plurality of internal structures positioned in the fluidized bed in the fluidized bed classifier which reduce a size of a bubble of the fluidized gas.

First claim

The invention claimed is:

1. A classification system using a fluidized bed, the classification system comprising:
a fluidized bed classifier configured to be supplied with a powder containing particles of different sizes, the fluidized bed classifier being configured to entrain the powder into a fluidized gas, and the fluidized bed classifier being configured to discharge a coarse powder of the powder through a coarse powder outlet positioned in a lower portion of the fluidized bed classifier;
a cyclone communicating with an upper portion of the fluidized bed classifier, the cyclone being configured to collect a fine powder of the powder entrained in the fluidized gas transferred from the fluidized bed classifier, and the cyclone being configured to discharge the collected fine powder from a fine powder outlet positioned in a lower portion of the cyclone; and
an internal structure positioned in a fluidized bed region of the fluidized bed classifier, the internal structure being configured to reduce a size of a bubble of the fluidized gas,

wherein the internal structure includes a frame conforming to an inner circumferential surface of the fluidized bed classifier and includes a wire having a lattice structure located in the frame,
wherein a diameter of the wire is 0.1% to 2% of a diameter of the fluidized bed classifier, and
wherein an open area of the internal structure is 80% to 95% of a cross-sectional area of the fluidized bed classifier.

2. The classification system of claim 1 , wherein the wire has a polygonal lattice structure.

3. The classification system of claim 1 , wherein the internal structure includes a plurality of internal structures located at regular intervals in a height direction of the fluidized bed classifier.

4. The classification system of claim 3 , wherein the plurality of internal structures are located at intervals of 0.05 m to 0.25 m with respect to one another.

5. The classification system of claim 3 , wherein an uppermost one of the plurality of internal structures is positioned at a height corresponding to a surface of a fluidized bed within the fluidized bed classifier.

6. The classification system of claim 1 , wherein the internal structure includes a plurality of internal structures each of which is installed in a position rotated 30° to 55° with respect to an adjacent one of the internal structures.

7. The classification system of claim 1 , wherein the classification system is configured such that the fluidized gas is supplied to the fluidized bed classifier through a fluidized gas injection pipe located in a bottom portion of the fluidized bed classifier, and then the fluidized gas is moved upward while entraining the powder, after which the fluidized gas is moved to the cyclone from the upper portion of the fluidized bed classifier, and then the fluidized gas is discharged to an upper portion of the cyclone to be circulated to the fluidized gas injection pipe.

8. The classification system of claim 7 , wherein, when the fluidized gas is discharged to the upper portion of the cyclone, the fluidized gas passes through a dust collector, and the fluidized gas is then transferred to a gas circulation pipe, which transfers the fluidized gas to the fluidized gas injection pipe to be circulated to the fluidized bed classifier.

Assignees

• Lg Chemical Ltd

Inventors

• Jeong Sung Woo
• Jeong In Yong

Classifications

• B04C2009/002

  with external filters · CPC title

• B04C9/00

  Combinations with other devices, e.g. fans, {expansion chambers, diffusors, water locks}(with filters B01D50/00) · CPC title

• B03B5/28

  by sink-float separation · CPC title

• B03B4/06 Primary

  using fixed and inclined tables {; using stationary pneumatic tables, e.g. fluidised beds} · CPC title

• B03B9/00 Primary

  General arrangement of separating plant, e.g. flow sheets · CPC title