1 Natural Circulation Boiler - Type iNook “CLOSED CIRCUITS” SCHNEIDER-KESSEL BERLIN ® STEAM-BOILER and HOT-WATER BOILER INTEC Sales Meeting June 26 th - 28 th 2013
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1
Natural Circulation Boiler - Type iNook
“CLOSED CIRCUITS”
SCHNEIDER-KESSEL BERLIN®
STEAM-BOILER and HOT-WATER BOILER
INTEC Sales Meeting June 26th- 28th 2013
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SCHNEIDER-KESSEL BERLIN®
Natural Circulation Boiler – Type iNook
“CLOSED CIRCUITS”
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TECHNICAL PRINCIPLE
� generation of high pressure steam
� boiler & consumer in closed circuit driven by natural circulation
� no condensate loss – no feed water
� condensate return into the boiler by gravity difference
� no contact of steam with the product
� only heat transfer into the product
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over-flow tubes with minimized flow resistance
unimpeded steam flow
gas tight membrane walls
central bottom flue gas box
UNIQUE DESIGN
Advantages / Design Features
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over-flow tubes with minimized flow resistance
UNIQUE DESIGN
Advantages / Design Features (SKB)
High Water Circulation Ratio
� resulting in excellent heat
transfer
� resulting in excellent
cooling of heated surfaces
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Hindered flow
UNIQUE DESIGN
Disadvantages / Other Design
� Unbalanced steam
flow in the evaporator
tubes
� Overheating in areas
with low cooling
� Danger of steam and
water separation
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undisturbed steam flow
UNIQUE DESIGN
Advantages / Design Features (SKB)
� no tube reductions
� no pressure drop
� no over overheating
� excellent water
circulation ratio
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SCHNEIDER iNook Design
(Membrane Tube Wall)
Other Design
(Tube-to-Tube)
Comparison
Design Features
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Disadvantages of Tube Reduction
� interruption of water circulation during peak load
� overheating of surfaces
� tube cracks
Comparison
Disadvantages / Design Features (Others)
cracks occurring in
this areas
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completely gas tight weldedmembrane tube walls
UNIQUE DESIGN
Advantages / Design Features (SKB)
� no flue gas leaking into adjoining passes
� heating surfaces 100% impinged
� boiler efficiency maximized
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� Disadvantages of Tube-to-Tube Design
(others)
� flue gas leaking into adjoining pass
� efficiency loss
Comparison
Disadvantages / Design Features (Others)
not gas tight –
welded!
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� heating surfaces 100% impinged
� boiler efficiency maximized
UNIQUE DESIGN
Advantages / Design Features (SKB)
centralized flue gas box
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Thank you very much!
SCHNEIDER-KESSEL BERLIN®
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