Rotary Kiln

Patent metadata

Field	Value
Publication number	US-2023384032-A1
Application number	US-202118031912-A
Country	US
Kind code	A1
Filing date	Oct 22, 2021
Priority date	Nov 4, 2020
Publication date	Nov 30, 2023
Grant date	—

Abstract

A rotary kiln comprises: a sintering device provided with a cylindrical rotation tube for mixing an input powder raw material while rotating in a horizontal direction; an external heating device for heating the powder raw material input into the rotation tube by heating the outside of the rotation tube; and an internal heating device for stirring and heating the powder raw material input into the rotation tube simultaneously. The internal heating device includes a microwave generation part for generating microwaves; a guide part for guiding the microwaves generated from the microwave generation part into the rotation tube; and a stirring heat generation part coupled to an inner circumferential surface of the rotation tube for stirring the powder raw material input into the rotation tube and simultaneously generating heat when absorbing the microwaves so as to heat the powder raw material.

First claim

1 . A rotary kiln comprising:
a sintering device provided with a cylindrical rotation tube configured to mix a powder raw material, the cylindrical rotation tube being configured to rotate about a horizontal axis, the horizontal axis being parallel to a central longitudinal axis; an external heating device configured to heat the powder raw material input into the rotation tube, the external heating device being configured to heat an exterior of the rotation tube; and an internal heating device configured to simultaneously stir and heat the powder raw material input into the rotation tube, wherein the internal heating device comprises:
a microwave generation part configured to generate microwaves;
a guide part configured to guide the microwaves into the rotation tube; and
a stirring heat generation part coupled to an inner circumferential surface of the rotation tube,
wherein the stirring heat generation part is configured to stir the powder raw material input into the rotation tube and the stirring heat generation part is configured to absorb the microwaves to generate heat.

2 . The rotary kiln of claim 1 , wherein the stirring heat generation part comprises:
a coupling rod disposed on the inner circumferential surface of the rotation tube, the coupling rod being parallel to the horizontal axis; at least one stirring heat generation elements configured to be coupled to the coupling rod, the at least one stirring heat generation element being configured to stir the powder raw material input into the rotation tube and being configured to absorb the microwaves to simultaneously heat the powder raw material; and a coupling piece configured to couple each of both ends of the coupling rod to the inner circumferential surface of the rotation tube.

3 . The rotary kiln of claim 2 , wherein the at least one stirring heat generation element has a tube shape through which the coupling rod is configured to pass.

4 . The rotary kiln of claim 2 , wherein a position of the coupling rod is fixed by the coupling piece, wherein the coupling rod is spaced a set distance
from the inner circumferential surface of the rotation tube.

5 . The rotary kiln of claim 2 , wherein, the at least one stirring heat generation elements includes a plurality of stirring heat generation elements, wherein an auxiliary tube is configured to be fitted and coupled to the coupling rod, the auxiliary tube being fixed between the stirring heat generation part and the plurality of stirring heat generation elements, and wherein the auxiliary tube is configured to be incapable of heat generation by absorption of the microwaves.

6 . The rotary kiln of claim 2 , wherein the rotation tube has a coupling groove, the coupling groove being recessed in an inner circumferential surface of each of both ends of the rotation tube within which the coupling piece is configured to be disposed.

7 . The rotary kiln of claim 1 , wherein the rotation tube comprises:
an outer tube; and an inner tube, the inner tube being positioned inside the outer tube and the inner tube being coupled to the internal heating device, wherein the outer tube and the inner tube include the same material.

8 . The rotary kiln of claim 1 , wherein the sintering device further comprises:
a raw material input member, the raw material input member being configured to receive a first end of the rotation tube, wherein the rotation tube is configured to be freely rotatably inserted into the raw material input member; a raw material input part, the raw material input being configured to input the powder raw material into the rotation tube; a raw material discharge member, the raw material discharge member being configured to receive a second end of the rotation tube, where the rotation tube is configured to be freely rotatably inserted into the raw material discharge member; and a raw material discharge part, the raw material discharge part being configured to discharge the powder raw material discharged from the rotation tube.

9 . The rotary kiln of claim 8 , wherein the guide part comprises:
a vertical tube, the vertical tube having a first end connected to the microwave generation part and a second end of the vertical tube being inserted into the raw material input member; and a horizontal tube, the horizontal tube extending along the horizontal axis from the second end of the vertical tube to an interior of the rotation tube, wherein the horizontal tube includes a plurality of guide holes configured to emit the microwaves into the interior of the rotation tube.

10 . The rotary kiln of claim 8 , wherein the sintering device comprises:
an input protection member, the input protection member having a first end fixed to the raw material input member and a second end of the input protection member being supported on an outer circumferential surface of the first end of the rotation tube, the input protection member being configured to protect a portion between the raw material input member and the first end of the rotation tube; and a discharge protection member, the discharge protection member having a first end fixed to the raw material discharge member and a second end of the discharge protection member being supported on an outer circumferential surface of the second end of the rotation tube, the discharge protection member being configured to protect a portion between the raw material discharge member and the second end of the rotation tube.

11 . The rotary kiln of claim 10 , wherein at least one of the input protection member and the discharge protection member comprises a corrugated pipe, the corrugated pipe having an elastic restoring force in a longitudinal direction of the rotation tube.

12 . The rotary kiln of claim 1 , wherein the sintering device further comprises a rotation member, the rotation member including a driving gear and a driving motor,
wherein the driving gear is coupled with a connector, the connector being configured to surround an outer circumferential surface of the rotation tube and wherein the driving motor is engaged with the driving gear, the driving gear being configured to rotate the rotation tube about the horizontal axis.

13 . The rotary kiln of claim 1 , wherein the stirring heat generation part includes silicon carbide (SiC) or graphite.

14 . The rotary kiln of claim 1 , wherein the external heating device comprises:
a heating body, the heating body being configured to surround an outer surface of the rotation tube; and a heating medium, the heating medium being provided in the heating body.

15 . The rotary kiln of claim 1 , wherein a plurality of the stirring heat generation parts are coupled to the inner circumferential surface of the rotation tube, the plurality of stirring heat generation parts configured to extend along the horizontal axis.

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Jong Seol
• Nho Jun Seok
• Ryoo Chang Seok
• Kim Dong Hwan
• Seong Eun Kyu
• Oh Myoung Hwan
• Ko Young Min

Classifications

• F27B7/34

  Arrangements of heating devices · CPC title

• F27D11/12

  with electromagnetic fields acting directly on the material being heated · CPC title

• F27D99/0001

  Heating elements or systems · CPC title

• F27B7/16

  the means being fixed relatively to the drum, {e.g. composite means}(F27B7/04 takes precedence) · CPC title

• F27B7/161 Primary

  the means comprising projections jutting out from the wall · CPC title