Nozzle assembly for a solid fuel burner and method of operating a nozzle assembly for a solid fuel burner

Patent metadata

Field	Value
Publication number	US-11305302-B2
Application number	US-202016749407-A
Country	US
Kind code	B2
Filing date	Jan 22, 2020
Priority date	Jan 22, 2020
Publication date	Apr 19, 2022
Grant date	Apr 19, 2022

Abstract

A nozzle tip for a pulverized solid fuel pipe nozzle of a pulverized solid fuel-fired furnace is provided. The nozzle tip includes a primary shroud having an inlet end and an outlet end, and an outlet at the outlet end for the passage of a pulverized solid fuel into the furnace. An area of the outlet is selectively adjustable to vary an exit velocity of the pulverized solid fuel from the nozzle tip.

First claim

What is claimed is:

1. A nozzle tip for a pulverized solid fuel pipe nozzle of a pulverized solid fuel-fired furnace, the nozzle tip comprising:
a primary shroud having an inlet end and an outlet end, and an outlet at the outlet end for the passage of a pulverized solid fuel into the furnace;
a secondary shroud surrounding the primary shroud; and
a passage intermediate the primary shroud and the secondary shroud for the passage of air;
wherein an area of the outlet is selectively adjustable to vary an exit velocity of the pulverized solid fuel from the nozzle tip; and
wherein the primary shroud and the secondary shroud are mechanically interconnected such that adjustment of a position of the primary shroud results in a simultaneous adjustment of a position of the secondary shroud.

2. The nozzle tip of claim 1 , wherein:
a position of at least a portion of the primary shroud is movable so as to reduce the area of the outlet and increase the exit velocity of the pulverized solid fuel.

3. The nozzle tip of claim 1 , wherein:
a position of at least a portion of the primary is movable so as to increase the area of the outlet and decrease the exit velocity of the pulverized solid fuel.

4. The nozzle tip of claim 1 , wherein:
the primary shroud includes a top plate and a bottom plate, and opposed lateral sides at least partially defining the outlet;
wherein at least one of the top plate and/or the bottom plate is adjustable to selectively increase or decrease the area of the outlet.

5. The nozzle tip of claim 4 , wherein:
both the top plate and bottom plate are adjustable.

6. The nozzle tip of claim 1 , wherein:
an angle of orientation of the nozzle tip with respect to the furnace is adjustable in a horizontal direction.

7. The nozzle of claim 1 , wherein:
an angle of orientation of the nozzle tip with respect to the furnace is adjustable in a vertical direction.

8. The nozzle of claim 1 , wherein:
the pulverized solid fuel is pulverized coal.

9. A method of operating a burner, comprising the steps of:
suppling a flow of fuel through at least one fuel nozzle assembly having a nozzle tip to a combustion chamber, the nozzle tip having a primary shroud for passage of the flow of fuel therethrough, and a secondary shroud surrounding the primary shroud, the primary shroud and the secondary shroud being mechanically interconnected and defining therebetween a passage for the passage of air;
varying an exit velocity of the fuel from the nozzle tip in dependence upon at least one of a property of the fuel and/or an operational requirement of the burner; and
adjusting a position of the primary shroud;
wherein adjustment of the position of the primary shroud causes a simultaneous adjustment of a position of the secondary shroud as a result of the mechanical interconnection between the primary shroud and the secondary shroud.

10. The method according to claim 9 , wherein:
varying the exit velocity of the fuel includes adjusting an area of an outlet of the nozzle tip.

11. The method according to claim 10 , wherein:
the fuel is pulverized coal; and
the at least one property of the fuel is a volatile matter content of the pulverized coal.

12. The method according to claim 11 , further comprising the step of:
reducing the outlet area to increase the exit velocity where the fuel is a high rank coal.

13. The method according to claim 11 , further comprising the step of:
increasing the outlet area to decrease the exit velocity where the fuel is a high rank coal.

14. The method according to claim 9 , further comprising the step of:
adjusting an angle of orientation of the nozzle tip in a horizontal direction.

15. The method according to claim 9 , further comprising the step of:
adjusting an angle of orientation of the nozzle tip in a vertical direction.

Assignees

• Gen Electric

Inventors

• Dunnu Gregory
• Gollnick Reinhard
• Pimenov Wadim
• Heimann Jakob

Classifications

• F23D2201/20

  Fuel flow guiding devices · CPC title

• B05B1/28 Primary

  with integral means for shielding the discharged liquid or other fluent material, e.g. to limit area of spray; with integral means for catching drips or collecting surplus liquid or other fluent material · CPC title

• F23D2201/10

  Nozzle tips · CPC title

• F23D2201/101

  tiltable · CPC title

• F23D1/00 Primary

  Burners for combustion of pulverulent fuel · CPC title