(Fossil-Fuel Steam Generators)

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• (Fossil-Fuel Steam Generators)
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3-1 Introduction
????? ??? ???? ??? ?? ??? ??? ?? ??? ?? ????.
1. ???(fire-tube) ??? 2. ??(water-tube) ???
3. ????(natural-circulation) ??? 4.
????(controlled-circulation) ??? 5.
???(once-trough flow) ??? 6. ???(subcritical) ??
7. ???(supercritcal) ??
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3-2 The Fire-Tube Boiler
Fig.3-1? ?? ?????? ????, Fig.3.2? ? ???? ?????.
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3-3 The Water-Tube Boiler Early
Developments
The Straight-Tube Boiler
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The Bent-Tube Boiler
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3-4 The Water-Tube Boiler Recent
Developments
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The Boiler Walls
??? ????? ??? ?? ? ??? ??? ???? ????.
??construction??(Fig.3-7)? ?? ?? ??. (a) bare
tubes??? ?? ?? (b) ???(refractory)? ???? (c)
studded tubes, (d) now-common membrane(???) ??
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3-5 Water Circulation
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3-6 The Steam Drum
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3-7 Superheaters and Reheaters
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3-8 Once-Through Boilers
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3-10 Air Preheaters
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3-11 Fans
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3-12 The Stack
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Dispersion
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3-13 Steam-Generator Control
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3-10 Air Preheaters
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3-11 Fans
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3-12 The Stack
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Dispersion
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3-13 Steam-Generator Control
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