Pulverized coal burner for forming reducing flame

Abstract

Abstract PURPOSE:To prevent dissipation of the heat generated in the vicinity of a burner throat through prevention of mixture of an internal peripheral air and an external peripheral air injected into a furnace and to reduce production of NOX without an increase in an unburnt content, by installing a sleeve of a refractory material, extending into a furnace, to the forward end of a duct for partitioning the internal and the external peripheral air mounted outside a pulverized coal conveying passage. CONSTITUTION:A trumpet-shaped sleeve 40, extending into a furnace and formed in a shape which widens toward the end, is located to the forward end on the furnace side of a duct 4 located outside a pulverized coal conveying passage 1. When combustion is effected by means of the pulverized coal burner so constituted which is employed in a burner for forming a reducing flame, the presence of the sleeve 40 prevents the mixture of the air injected into a furnace through an internal peripheral air passage 2 and an external peripheral air passage 3, whereby the heat in the vicinity of a burner throat can be prevented from dissipating, and the radiant heat from the sleeve can be effectively utilized. This enables a reducing flame, formed at a burner part, to be maintained at a high temperature, whereby improvement of firing may decrease production of a unburnt content and improves vaporization of an N-content in char, resulting in reduction in the amount of NO which is produced at an air combustion part at a rear flow resulting from the presence of a residual N-content.

Inventors

• 👤 Shigeki Morita
• 👤 茂樹 森田
• 👤 Tadahisa Masai
• 👤 政井　忠久
• 👤 Toshio Uemura
• 👤 俊雄 植村
• 👤 Kiichi Itagaki
• 👤 喜一 板垣
• 👤 Fumio Koda
• 👤 幸田　文夫
• 👤 Yoshito Kawaguchi
• 👤 河口　義人

Bibliographic Details