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-12241683-B2
Application number	US-202017763450-A
Country	US
Kind code	B2
Filing date	Sep 11, 2020
Priority date	Sep 26, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

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 ( 3 A) configured to supply a first fuel gas; and a first combustion-supporting gas supply path ( 4 A) configured to supply a first combustion-supporting gas; wherein the raw material powder supply path includes: a first supply path ( 2 A) configured to extend in an axial direction of the burner ( 1 ); a first collision wall ( 2 D) configured to be located at the top of the first supply path ( 2 A); a plurality of second supply paths ( 2 B) configured to be branched from the top of the first supply path ( 2 A), and extend radially from the center of the burner ( 1 ); one or more dispersion chambers ( 2 C) configured to be located at the top of the second supply path ( 2 B), and have a space in which the cross-sectional area is larger than the cross-sectional area in the second supply path ( 2 B); and one or more raw material ejection holes ( 2 a ) configured to communicate with the dispersion chamber ( 2 C).

First claim

The invention claimed is:

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;
a dispersion chamber configured to be located at the top of each respective second supply path of the plurality of second supply paths, to communicate with the respective second supply path, and to have a space in which the cross-sectional area in the direction perpendicular to the direction in which the respective second supply path extends is larger than the cross-sectional area in the respective second supply path;
one or more raw material ejection holes configured to communicate with each said dispersion chamber, and extend in the axial direction; and
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, and
wherein the dispersion mechanism is a convex portion having one top portion protruding from the wall surface.

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

3. The burner for producing inorganic spheroidized particles according to claim 1 ,
wherein each said dispersion chamber comprises a second collision wall which intersects a direction in which the second supply path extends.

4. The burner for producing inorganic spheroidized particles according to claim 3 ,
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.

5. 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.

6. 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 containing oxygen using the burner for producing inorganic spheroidized particle according to claim 1 ,
wherein the method comprises changing a carrying vector of the raw material powder one or more times from the axial direction to the radial direction of the burner when the raw material powder is supplied in the burner flame together with a carrying gas.

7. The method for producing inorganic spheroidized particles according to claim 6 ,
wherein the fuel gas and the combustion-supporting gas are supplied into a plurality of the premixing chambers, mixed in advance, combusted to generate a flame, and the inorganic powder is sent into the flame.

8. 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;
a dispersion chamber configured to be located at the top of each respective second supply path of the plurality of second supply paths, to communicate with the respective second supply path, and to have a space in which the cross-sectional area in the direction perpendicular to the direction in which the respective second supply path extends is larger than the cross-sectional area in the respective second supply path;
one or more raw material ejection holes configured to communicate with each said dispersion chamber, and extend in the axial direction, and
wherein when a 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, and has a diameter larger than a diameter of the first supply path.

9. 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;
a first combustion-supporting gas supply path configured to supply a first combustion-supporting gas; and
a plurality of first premixing chambers configured to be located at a position near a tip of the burner, and mix the first fuel gas and the 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;
a dispersion chamber configured to be located at the top of each respective second supply path of the plurality of second supply paths, to communicate with the respective second supply path, and have a space in which the cross-sectional area in the direction perpendicular to the direction in which the respective second supply path extends is larger than the cross-sectional area in the respective second supply path;
one or more raw material ejection holes configured to communicate with each said dispersion chamber, and extend in the axial direction, and
wherein 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,
wherein 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,
wherein a respective first premixing chamber of the plurality of first premixing chambers is configured to communicate with each of the first fuel

Assignees

• Taiyo Nippon Sanso Corp

Inventors

• Yamamoto Yasuyuki
• Hagihara Yoshiyuki
• Yamaguchi Masashi

Classifications

• F27D17/25

  using cyclones · CPC title

• F27B1/08

  heated otherwise than by solid fuel mixed with charge · CPC title

• F27B1/06

  of other than up-draught type · CPC title

• F23D14/70

  Baffles or like flow-disturbing devices · CPC title

• F23D14/02 Primary

  Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone · CPC title