| 摘要 |
PURPOSE:To prevent fluid medium from contacting a water tube wall and reduce the abrasion of the water tube wall by a method wherein small holes which eject gas are provided near the top of the fluid medium loading section of a panel which forms the water tube wall. CONSTITUTION:A panel 11 near the top of the fluidized bed 3 loading section of a water tube wall 8 is provided with small holes 14 bored orthogonally to the surface of the panel 11, and other small holes 15, whose center lines are slanted toward water tubes 10. Gas is ejected through these small holes 14, 15 whereby the collision of fluid medium 23 against the water tube wall 8 may be prevented or the speed of the fluid medium 23 which has higher speed may be weakened. Accordingly, the damages of the water tube wall 8 due to abrasion can be remarkably reduced.
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