Title:
【発明の名称】微粉炭燃焼バーナ
Document Type and Number:
Japanese Patent JP3344694
Kind Code:
B2
Abstract:
The pulverized coal burner suitable for lowering the concentration of nitrogen comprises a pulverized coal nozzle (10) for jetting a mixture of pulverized coal and primary air, a secondary air nozzle (11) and a tertiary air nozzle (12), concentrically arranged around the outer periphery of the pulverized coal nozzle (10), and a tube expanded portion (20) at the end of a partition wall separating two adjacent air nozzles. A flow shift means for shifting the secondary air in the secondary air nozzle so as to flow along the tube expanded portion, for example a guide plate (61), is provided. The secondary air comes to be jetted outward by the guide plate, and mixing of the secondary air and the tertiary air with pulverized coals is delayed, whereby an amount of occurrence of NOx can be decreased. The guide plate (61) is a ring disposed in an outlet region of the secondary air nozzle (11), which ring has a taper-shaped ring portion for guiding a part of the secondary air (52) in a radially outward direction.
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Inventors:
岡▲崎▼ 洋文
Hironobu Kobayashi
Shunichi Tsumura
Kenji Kiyama
Tadashi Jimbo
Koji Kuramasu
Shigeki Morita
Shinichiro Nomura
Miki Mori
Hironobu Kobayashi
Shunichi Tsumura
Kenji Kiyama
Tadashi Jimbo
Koji Kuramasu
Shigeki Morita
Shinichiro Nomura
Miki Mori
Application Number:
JP19848997A
Publication Date:
November 11, 2002
Filing Date:
July 24, 1997
Export Citation:
Assignee:
株式会社日立製作所
バブコック日立株式会社
バブコック日立株式会社
International Classes:
F23C99/00; F23D1/00; F23D1/02; (IPC1-7): F23D1/00; F23C11/00
Domestic Patent References:
| JP926112A | ||||
| JP60200008A | ||||
| JP7151309A | ||||
| JP9159109A | ||||
| JP9318014A | ||||
| JP8285231A | ||||
| JP6246109A |
Attorney, Agent or Firm:
Kiyoshi Maruyama (5 others)