| 摘要 |
PURPOSE:To perform stable burning in a broad load range, by forming and arranging a member, which deflects the flow or pulverized coal with respect to a flame keeping ring and the axial direction of a jetting tube. CONSTITUTION:A flame keeping ring 4 is attached to an annular groove at the opening end of a primary sleeve 21, which is a jetting tube, on the side of a furnace. The ring 4 comprises a perpendicular crossing part 4a, which is intersected with a pulverized coal stream 1 at a right angle, and a cone part 4b, which is opened on the side of the furnace in connection with the outer peripheral edge of the perpendicular crossing part 4a. Openings 16 form a constant angle alpha with a forming plane 22 of the perpendicular crossing part 4a. The vortex-shaped pulverized coal stream 18 is deflected in the circumferential direction of the cone part 4b through the opening parts 16 since the opening parts 16 are formed at the constant angle alpha. The fluid energy in the axial direction of the primary sleeve 21 is reduced. The flame keeping ability, i.e., the keeping ability of the vortex of the pulverized coal, is relatively increased. Therefore, the pulverized coal particle, whose diameter is large, can be held on the flame keeping ring 4, and the stability of the flame can be enhanced.
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