| 摘要 |
PURPOSE:To realize the low NOx at each burner and shorten the flame in a whole by a method wherein a flame holder is formed and installed at the furnace side end part of a fuel injecting pipe, a burner axis flame is placed in a reducing atmosphere, then the perfect burning is performed by forming a gas low surrounding said burner axis flame. CONSTITUTION:A powdered coal is fed to a furnace 18 through a primary injecting port 5, a steady flame root is formed by drawing the powdered coal into a small vortex formed in the inner surface of a flame holder 6. During the operation, a primary gas 7 mixed with an exhaust gas or an air is spouted out through a primary gas spouting port 8 via a primary gas passage 7a. The flame is separated from a secondary gas and a tertiary gas which are spouted out through each spouting port 10, 13 via a secondary gas passage 9a and a tertiary gas passage 13a. |
