Nozzle structure for hydrogen gas burner apparatus

Patent metadata

Field	Value
Publication number	US-11098893-B2
Application number	US-201816101694-A
Country	US
Kind code	B2
Filing date	Aug 13, 2018
Priority date	Sep 5, 2017
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

The present disclosure provides a nozzle structure for a hydrogen gas burner apparatus capable of reducing an amount of generated NOx. A nozzle structure for a hydrogen gas burner apparatus includes an outer tube and an inner tube concentrically disposed inside the outer tube. The inner tube is disposed so that an oxygen-containing gas is discharged from an opened end of the inner tube in an axial direction of the inner tube. The outer tube extends beyond the opened end of the inner tube in the axial direction of the inner tube so that a hydrogen gas passes through a space between an inner circumferential surface of the outer tube and an outer circumferential surface of the inner tube.

First claim

What is claimed is:

1. A nozzle structure for a hydrogen gas burner apparatus, comprising an outer tube and an inner tube concentrically disposed inside the outer tube, wherein
the inner tube is disposed so that an oxygen-containing gas is discharged from an opened end of the inner tube in an axial direction, and
the outer tube extends beyond the opened end of the inner tube in the axial direction so that a hydrogen gas passes through a space between an inner circumferential surface of the outer tube and an outer circumferential surface of the inner tube and proceeds along an outer periphery of the oxygen-containing gas, thereby suppressing contact between and mixture of the oxygen-containing gas and the hydrogen gas,
wherein the outer tube forms the exterior surface of the nozzle structure,
wherein a fin is provided in a section between the opened end of the inner tube and a base part thereof,
wherein the fin has a rectangular planar shape and a long side of the rectangular planar shape extends in the axial direction, and
wherein the fin is configured to guide the hydrogen gas in a direction parallel to the axial direction.

2. The nozzle structure for a hydrogen gas burner apparatus according to claim 1 , further comprising:
an oxygen-containing gas blowing duct configured to blow out the oxygen-containing gas in the axial direction and make the oxygen-containing gas pass through a space inside the inner tube; and
a hydrogen gas blowing duct configured to blow out the hydrogen gas into the space between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube in the axial direction, and make the hydrogen gas pass through between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube, wherein
the oxygen-containing gas blowing duct has a circular shape, and
the hydrogen gas blowing duct has an annular shape so as to surround the oxygen-containing gas blowing duct.

3. The nozzle structure for a hydrogen gas burner apparatus according to claim 1 , wherein the fin protrudes toward the inner tube and is provided on the inner circumferential surface of the outer tube.

4. The nozzle structure for a hydrogen gas burner apparatus according to claim 1 , wherein the fin protrudes toward the outer tube and is provided on the outer circumferential surface of the inner tube.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hirata Koichi
• Sakuma Daisuke
• Ueno Noriyuki

Classifications

• F23D14/22 Primary

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

• F23D14/126 Primary

  cooperating with refractory wall surfaces · CPC title

• F23D14/20 Primary

  Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone (F23D14/38 takes precedence) · CPC title

• F23D2203/002

  Radiant burner mixing tubes · CPC title

• F23D14/48

  Nozzles · CPC title