Combustion burner and boiler

• US 10,591,154 B2
• Filed: 02/22/2016
• Issued: 03/17/2020
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Matsumoto, Keigo, Domoto, Kazuhiro, Tominaga, Yukihiro, Tanaka, Ryuichiro, Abe, Naofumi
• Primary Examiner(s): McAllister, Steven B
• Assistant Examiner(s): Namay, Daniel E.
• Application Number:
  US15/553,307
• Publication Number:
  US 20180045404A1
• Time in Patent Office: 1,485 Days
• Field of Search: 431 8, 431171, 431350
• CPC Class Codes: F23C 2700/063 Arrangements for igniting, flame-guiding, air supply in
• CPC Class Codes: F23C 5/08 Disposition of burners
• CPC Class Codes: F23C 5/12 for pulverulent fuel
• CPC Class Codes: F23D 1/00 Burners for combustion of pulverulent fuel disposition of burners F23C
• CPC Class Codes: F23D 11/406 Flame stabilising means, e.g. flame holders
• CPC Class Codes: F23D 2201/20 Fuel flow guiding devices
• CPC Class Codes: F23K 3/02 Pneumatic feeding arrangements, i.e. by air blast

Abstract

A combustion burner including: a fuel nozzle (61) which ejects a fuel gas that is a mixture of fuel and air; a combustion air nozzle (62) which ejects air from an outer side of the fuel nozzle (61); first members (71) which are arranged inside the fuel nozzle (61) and which each comprise a first inclined surface (82a) inclined with respect to the flow of the fuel gas, and a first inclination end edge where the inclination of the first inclined surface (82a) ends; and second members (72) which are arranged downstream of the first inclination end edges in the direction of fuel gas flow, and which each comprise a second inclined surface (84a) inclined towards the first members (71) with respect to the fuel gas flow and a second inclination end edge where the inclination of the second inclined surface (84a) ends.

Claims

1. A combustion burner comprising:

a fuel nozzle ejecting a fuel gas being a mixture of fuel and air;

a combustion air nozzle ejecting air from an outer side of the fuel nozzle;

a first member arranged inside the fuel nozzle and comprising a first inclined surface inclined with respect to a flow of the fuel gas and a first inclination end edge, the first inclined surface ending inclination at the first inclination end edge; and

second members arranged downstream of the first inclination end edge in a direction of the fuel gas flow and each comprising a second inclined surface inclined toward the first member with respect to the fuel gas flow and a second inclination end edge, the second inclined surface ending inclination at the second inclination end edge;

the second members being disposed on both sides of the first member,

wherein the second members are disposed in a vicinity of an opening of the fuel nozzle at predetermined intervals from inner wall surfaces of the fuel nozzle.

2. The combustion burner according to claim 1, wherein:

the first member comprises a plurality of the first inclined surfaces spreading an ejected direction of the fuel gas in at least two directions; and

the second members each comprise the second inclined surface disposed only on a side close to the first member.

3. The combustion burner according to claim 2, further comprising a third member disposed downstream of the first inclination end edge in the fuel gas flow direction between a plurality of the first members, the third member comprising third inclined surfaces inclined toward the first members with respect to the fuel gas flow and third inclination end edges, the third inclined surfaces ending inclination at the third inclination end edges.

4. The combustion burner according to claim 1, wherein the first member is provided so that a position thereof is adjustable in the fuel gas flow direction.

5. The combustion burner according to claim 1, wherein the first member and the second members are oriented in a vertical direction and arranged at predetermined intervals in a horizontal direction.

6. The combustion burner according to claim 1, wherein the first member and the second members are oriented in the horizontal direction and arranged at predetermined intervals in the vertical direction.

7. The combustion burner according to claim 5, further comprising secondary air nozzles ejecting air from the outer side of the combustion air nozzle and disposed at least on both sides in an inclination direction of the first inclined surface of the first member in the fuel nozzle.

8. The combustion burner according to claim 5, further comprising a rectifying plate extending from a first end portion to a second end portion of the fuel nozzle.

9. The combustion burner according to claim 8, wherein a plurality of the rectifying plates are disposed at both ends of the first member and the second members in the fuel gas flow direction so as to face each other.

10. The combustion burner according to claim 9, wherein a distance between the facing rectifying plates gradually expands toward a downstream side in the fuel gas flow direction.

11. The combustion burner according to claim 8, further comprising a pulverized coal tube connected with an upstream end of the combustion air nozzle, the pulverized coal tube having a distal end formed so that a cross-sectional area of a flow path expands toward the downstream side in the fuel gas flow direction, and the pulverized coal tube comprising a plurality of plate members at the distal end.

12. A boiler comprising:

a furnace that is hollow and installed in a vertical direction;

the combustion burner according to claim 1, disposed at the furnace; and

a flue disposed at an upper portion of the furnace.

13. The boiler according to claim 12, further comprising an additional air supplier disposed above the combustion burner at the furnace.