Burner for producing inorganic spheroidized particles, apparatus for producing inorganic spheroidized particles, and method for producing inorganic spheroidized particles

Patent metadata

Field	Value
Publication number	US-2022341666-A1
Application number	US-202017763450-A
Country	US
Kind code	A1
Filing date	Sep 11, 2020
Priority date	Sep 26, 2019
Publication date	Oct 27, 2022
Grant date	—

Abstract

One object of the present invention is to provide a burner for producing inorganic spheroidized particles which can efficiently melt and spheroidize even organic powder with a large particle size distribution. The present invention provides a burner for producing inorganic spheroidized particles, including; a raw material powder supply path configured to supply inorganic powder as raw material powder; a first fuel gas supply path (3A) configured to supply a first fuel gas; and a first combustion-supporting gas supply path (4A) configured to supply a first combustion-supporting gas; wherein the raw material powder supply path includes: a first supply path (2A) configured to extend in an axial direction of the burner (1); a first collision wall (2D) configured to be located at the top of the first supply path (2A); a plurality of second supply paths (2B) configured to be branched from the top of the first supply path (2A), and extend radially from the center of the burner (1); one or more dispersion chambers (2C) configured to be located at the top of the second supply path (2B), and have a space in which the cross-sectional area is larger than the cross-sectional area in the second supply path (2B); and one or more raw material ejection holes (2a) configured to communicate with the dispersion chamber (2C).

First claim

1 . A burner for producing inorganic spheroidized particles using a fuel gas and a combustion-supporting gas containing oxygen, comprising;
a raw material powder supply path configured to supply inorganic powder as raw material powder together with a carrier gas; a first fuel gas supply path configured to supply a first fuel gas; and a first combustion-supporting gas supply path configured to supply a first combustion-supporting gas; wherein the raw material powder supply path comprises: a first supply path configured to be located in the center of the burner and extend in an axial direction of the burner; a first collision wall configured to be located at the top of the first supply path, and intersect perpendicularly with the axial direction of the burner; a plurality of second supply paths configured to be branched from the top of the first supply path, and extend radially from the center of the burner when the burner is cross-sectionally viewed; one or more dispersion chambers configured to be located at the top of the second supply path, communicate with the second supply path, and have a space in which the cross-sectional area in the direction perpendicular to the direction in which the second supply path extends is larger than the cross-sectional area in the second supply path; and one or more raw material ejection holes configured to communicate with the dispersion chamber, and extend in the axial direction.

2 . The burner for producing inorganic spheroidized particles according to claim 1 ,
wherein the burner further comprises a dispersion mechanism configured to be located at a wall surface of the first collision wall, and change a carrying vector of the raw material powder from the axial direction toward the radial direction of the burner at least once.

3 . The burner for producing inorganic spheroidized particles according to claim 2 ,
wherein the dispersion mechanism is a convex portion having one top portion protruding from the wall surface.

4 . The burner for producing inorganic spheroidized particles according to claim 3 ,
wherein the top portion is located on the central axis of the burner 1 .

5 . The burner for producing inorganic spheroidized particles according any claim 1 wherein the dispersion chamber comprises a second collision wall which intersects a direction in which the second supply path extends.

6 . The burner for producing inorganic spheroidized particles according to claim 5 ,
wherein when the burner is viewed in plan view, the raw material powder ejection hole is located closer to the center than the second collision wall.

7 . The burner for producing inorganic spheroidized particles according to claim 1 ,
wherein when the tip of the burner is viewed in plan view, openings of the raw material powder ejection holes are arranged on a circumference of a circle which is centered on the central axis of the burner 1 , and has a diameter larger than a diameter of the first supply path 2 A

8 . The burner for producing inorganic spheroidized particles according to claim 1 ,
wherein the burner further comprises a plurality of first premixing chambers configured to be located at a position near the tip of the burner, and mix the first fuel gas and the first combustion-supporting gas, the first fuel gas supply path branches into a plurality of first fuel supply branched flow paths near the tip of the burner in the axial direction, the first combustion-supporting gas supply path branches into a plurality of first combustion-supporting gas supply branched flow paths near the tip of the burner in the axial direction, and the first premixing chamber communicates with any one of the first fuel supply branched flow paths and any one of the first combustion-supporting gas supply branched flow paths.

9 . The burner for producing inorganic spheroidized particles according to claim 8 ,
wherein each of a plurality of the first premixing chambers has an opening at the tip of the burner in the axial direction.

10 . The burner for producing inorganic spheroidized particles according to claim 8 ,
wherein the first fuel supply branched flow paths are arranged inside the first combustion-supporting gas supply branched flow paths.

11 . The burner for producing inorganic spheroidized particles according to claim 10 ,
wherein a tip of the first fuel supply branched flow path is arranged inside the first combustion-supporting gas supply branched flow path, a space from the tip of the first fuel supply branched flow path to the tip of the first combustion-supporting gas supply branched flow path is the first premixing chamber, and an opening at the tip of the first combustion-supporting gas supply branched flow path is an opening of the first premixing chamber.

12 . The burner for producing inorganic spheroidized particles according to claim 11 ,
wherein when the tip of the burner is viewed in plan view, the openings of a plurality of the first premixing chambers are arranged in an annular shape centered on the central axis of the burner on either or both the inside and outside of the raw material powder ejection holes arranged in an annular shape.

13 . The burner for producing inorganic spheroidized particles according to claim 11 ,
wherein the burner further comprises: a second fuel gas supply path configured to supply a second fuel gas; a second combustion-supporting gas supply path configured to supply a second combustion-supporting gas; and a plurality of second premixing chambers configured to be located at a position near the tip of the burner in the axial direction, and mix the second fuel gas and the second combustion-supporting gas; the second fuel gas supply path branches into a plurality of second fuel supply branched flow paths at a portion near the tip of the burner; the second combustion-supporting gas supply path branches into a plurality of second combustion-supporting gas supply branched flow paths at a portion near the tip of the burner; a tip of the second fuel supply branched flow path is arranged inside the second combustion-supporting gas supply branched flow path, and a space from the tip of the second fuel supply branched flow path to the tip of the second combustion-supporting gas supply branched flow path is the second premixing chamber; and an opening of the tip of the second combustion-supporting gas supply branched flow path is an opening of the second premixing chamber.

14 . The burner for producing inorganic spheroidized particles according to claim 13 ,
wherein when the tip of the burner is viewed in plan view, the openings of a plurality of the first premixing chambers are arranged in an annular shape centered on the central axis of the burner on either the inside or the outside of the opening of the raw material powder ejection holes arranged in an annular shape, and the openings of a plurality of the second premixing chambers are arranged in an annular shape centered on the central axis of the burner on the other side.

15 . An apparatus for producing inorganic spheroidized particles, comprising:
a burner according to claim 1 , a vertical spheroidizing furnace in which the burner for producing inorganic spheroidized particles is connected vertically downward to the top thereof; and
a cyclone and a bag filter provided in a subsequent stage of the spheroidizing furnace.

16 . A method for producing inorganic spheroidized particles in which inorganic powder as raw material powder is melted and spheroidized by a burner flame formed by combustion of a fuel gas and a combustion-supporting gas

Assignees

• Taiyo Nippon Sanso Corp

Inventors

• Yamamoto Yasuyuki
• Hagihara Yoshiyuki
• Yamaguchi Masashi

Classifications

• F23D14/48

  Nozzles · CPC title

• F23D14/70

  Baffles or like flow-disturbing devices · CPC title

• C01F7/021

  After-treatment of oxides or hydroxides · CPC title

• F23D14/62

  Mixing devices; Mixing tubes · CPC title

• F23D14/22

  with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other · CPC title