| 摘要 |
A steam generator has a combustion chamber through which a bundle of steam-generating tubes extends generally horizontally. Air nozzles extend upwardly through the bottom wall of the steam generator and the spacing between the air outlets and the bundle of steam-generating tubes can be adjusted to thereby vary the level at which the fluidized bed is located within the chamber, and to consequently have the bundle of tubes located completely or only partially within the fluidized bed.
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