System and method for increasing the concentration of pulverized fuel in a power plant

Patent metadata

Field	Value
Publication number	US-2017356643-A1
Application number	US-201615177650-A
Country	US
Kind code	A1
Filing date	Jun 9, 2016
Priority date	Jun 9, 2016
Publication date	Dec 14, 2017
Grant date	—

Abstract

A pre-ignition conduit for a pulverized fuel nozzle includes a duct having first and second opposing end portions, the first end portion configured to face an outlet of an igniter. The conduit further includes a cone-shaped concentrator for collecting and forwarding pulverized fuel into the duct for ignition, the cone-shaped concentrator being secured to the first end portion and located between the outlet of the igniter and the duct. The pre-ignition conduit functions as an ignition chamber within a pulverized fuel nozzle.

First claim

What is claimed is:

1 . A pre-ignition conduit for a pulverized fuel nozzle comprising:
a duct having first and second opposing end portions, the first end portion facing an outlet of an igniter; a cone-shaped concentrator for collecting and forwarding pulverized fuel into the duct for ignition, the cone-shaped concentrator being secured to the first end portion and located between the outlet of the igniter and the duct; and wherein the pre-ignition conduit functions as an ignition chamber within a pulverized fuel nozzle.

2 . The pre-ignition conduit of claim 1 wherein the cone-shaped concentrator includes an eccentric cone.

3 . The pre-ignition conduit of claim 1 wherein the cone-shaped concentrator has a circumferential edge portion that includes a discontinuity.

4 . The pre-ignition conduit of claim 1 wherein the cone-shaped concentrator is located at a distance of about 50 mm to about 150 mm from the igniter outlet.

5 . The pre-ignition conduit of claim 1 wherein the pulverized fuel nozzle has an inner diameter D and the duct of the pre-ignition conduit has an inner diameter d; and
wherein if D>500 mm then d≧D/2.

6 . The pre-ignition conduit of claim 1 wherein the pulverized fuel nozzle has an inner diameter D and the duct of the pre-ignition conduit has an inner diameter d; and
wherein if 500 mm≦D≦600 mm then 250 mm≦d≦300 mm.

7 . The pre-ignition conduit of claim 1 wherein the pulverized fuel nozzle has an inner diameter D and the duct of the pre-ignition conduit has an inner diameter d; and
wherein if D>600 mm then d≦D/2.

8 . The pre-ignition conduit of claim 1 wherein the pulverized fuel nozzle has an inner diameter D and the duct of the pre-ignition conduit has an inner diameter d and d≦2D/3.

9 . The pre-ignition conduit of claim 1 wherein the duct of the pre-ignition conduit has an inner diameter d and the outlet of the igniter has an outer diameter P and d≧P.

10 . The pre-ignition conduit of claim 1 wherein the pulverized fuel nozzle has an inner diameter D and pre-ignition conduit has an overall length L and L≧D.

12 . The pre-ignition conduit of claim 1 wherein the cone-shaped concentrator has a cone angle β that is between 5 and 45 degrees.

13 . The pre-ignition conduit of claim 12 wherein cone angle β is between 15 and 30 degrees.

14 . The pre-ignition conduit of claim 1 wherein the cone-shaped concentrator has an inner diameter M and the duct of the pre-ignition conduit has an inner diameter d and d×1.1≦M≦d×1.3.

15 . A pulverized fuel nozzle for a burner having an internal diameter D, the nozzle comprising:
an igniter having an outlet; a pre-ignition conduit that includes a duct have first and second opposing end portions, the first end portion configured to face the outlet of the igniter and a cone-shaped concentrator for collecting and forwarding pulverized fuel into the duct for ignition, the cone-shaped concentrator being secured to the first end portion and located between the outlet of the igniter and the duct; and wherein the pre-ignition conduit functions as an ignition chamber within the pulverized fuel nozzle.

16 . The pulverized fuel nozzle of claim 15 wherein the cone-shaped concentrator includes an eccentric cone.

17 . The pulverized fuel nozzle of claim 15 wherein the cone-shaped concentrator has a circumferential edge portion that is discontinuous.

18 . The pulverized fuel nozzle of claim 15 wherein the cone-shaped concentrator is located at a distance of about 50 mm to about 150 mm from the igniter outlet.

19 . The pulverized fuel nozzle of claim 15 wherein the pulverized fuel nozzle has an inner diameter D and the duct of the pre-ignition conduit has an inner diameter d; and
wherein if D>500 mm then d≧D/2.

20 . The pulverized fuel nozzle of claim 15 wherein the pulverized fuel nozzle has an inner diameter D and the duct of the pre-ignition conduit has an inner diameter d; and
wherein if 500 mm≦D≦600 mm then 250 mm≦d≦300 mm.

21 . The pulverized fuel nozzle of claim 15 wherein the pulverized fuel nozzle has an inner diameter D and the duct of the pre-ignition conduit has an inner diameter d; and
wherein if D>600 mm then d≦D/2.

22 . The pulverized fuel nozzle of claim 15 wherein the pulverized fuel nozzle has an inner diameter D and the duct of the pre-ignition conduit has an inner diameter d and d≦2D/3.

23 . The pulverized fuel nozzle of claim 15 wherein the duct of the pre-ignition conduit has an inner diameter d and the outlet of the igniter has an outer diameter P and d≧P.

24 . The pulverized fuel nozzle of claim 15 wherein the pulverized fuel nozzle has an inner diameter D and pre-ignition conduit has an overall length L and L≧D.

25 . The pulverized fuel nozzle of claim 15 wherein the cone-shaped concentrator has a cone angle β that is between 5 and 45 degrees.

26 . The pulverized fuel nozzle of claim 25 wherein cone angle β is between 15 and 30 degrees.

27 . The pulverized fuel nozzle of claim 15 wherein the cone-shaped concentrator has an inner diameter M and the duct of the pre-ignition conduit has an inner diameter d and d×1.1≦M≦d×1.3.

28 . A pre-ignition conduit for a pulverized fuel nozzle comprising:
a duct having first and second opposing end portions, the first end portion configured to face an outlet of an igniter; a cone-shaped concentrator for collecting and forwarding pulverized fuel into the duct for ignition, the cone-shaped concentrator being secured to the first end portion and located between the outlet of the igniter and the duct; and wherein the duct includes an ignition inlet for receipt of an ignition source.

29 . The pre-ignition conduit of claim 28 wherein the ignition inlet is at an angle α, and 30°<α<90°.

Assignees

• General Electric Technology Gmbh

Inventors

• Ristic Dragisa
• Harter Klemens Jakob
• Kluger Frank Michael

Classifications

• F23Q13/00

  Igniters not otherwise provided for · CPC title

• F23D2201/00

  Burners adapted for particulate solid or pulverulent fuels · CPC title

• F23C2900/99005

  Combustion techniques using plasma gas · CPC title

• F23D1/00 Primary

  Burners for combustion of pulverulent fuel · CPC title

• F23D2201/20

  Fuel flow guiding devices · CPC title