MAN B&W
3.03
Page of 2
MAN Diesel
198 58 94-7.1
MAN B&W MC/MC-C/ME/ME-C/ME-GI/ME-B Engines
The NO
x
in the exhaust gas can be reduced with
primary or secondary reduction methods. Primary
methods affect the engine combustion process
directly, whereas secondary methods reduce the
emission level without changing the engine per-
formance using equipment that does not form
part of the engine itself.
For further information about emission control we
refer to our publication:
Exhaust Gas Emission Control Today and Tomorrow
The publication is available at www.mandiesel.com
under ‘Quicklinks’
→
‘Technical Papers’
Engine with Selective Catalytic Reduction System
Option: 4 60 35
If a reduction between 50 and 98% of NO
x
is re-
quired, the Selective Catalytic Reduction (SCR)
system has to be applied by adding ammonia or
urea to the exhaust gas before it enters a catalytic
converter.
The exhaust gas must be mixed with ammonia be-
fore passing through the catalyst, and in order to
encourage the chemical reaction the temperature
level has to be between 300 and 400 °C. During
this process the NO
x
is reduced to N
2
and water.
This means that the SCR unit has to be located
before the turbocharger on twostroke engines
because of their high thermal efficiency and there-
by a relatively low exhaust gas temperature.
The amount of ammonia injected into the ex-
haust gas is controlled by a process computer
and is based on the NO
x
production at different
loads measured during the testbed running. Fig.
3.03.0.
As the ammonia is a combustible gas, it is sup-
plied through a doublewalled pipe system, with
appropriate venting and fitted with an ammonia
leak detector (Fig. 3.03.0) which shows a simpli-
fied system layout of the SCR installation.
NO
x
Reduction by SCR
Summary of Contents for B&W S80ME-C7
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Page 15: ...MAN B W MAN Diesel Engine Design 1 ...
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Page 31: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2 ...
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Page 63: ...MAN B W MAN Diesel Turbocharger Choice Exhaust Gas By pass 3 ...
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Page 71: ...MAN B W MAN Diesel Electricity Production 4 ...
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Page 86: ...MAN B W Page of 1 MAN Diesel This section is not applicable PTO BW GCR 4 04 198 47 58 9 0 ...
Page 109: ...MAN B W MAN Diesel Installation Aspects 5 ...
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Page 143: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6 ...
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Page 163: ...MAN B W MAN Diesel Fuel 7 ...
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Page 179: ...MAN B W MAN Diesel Lubricating Oil 8 ...
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Page 199: ...MAN B W MAN Diesel Cylinder Lubrication 9 ...
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Page 209: ...MAN B W MAN Diesel Piston Rod Stuffing Box Drain Oil 10 ...
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Page 213: ...MAN B W MAN Diesel Central Cooling Water System 11 ...
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Page 219: ...MAN B W MAN Diesel Seawater Cooling System 12 ...
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Page 231: ...MAN B W MAN Diesel Starting and Control Air 13 ...
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Page 239: ...MAN B W MAN Diesel Scavenge Air 14 ...
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Page 249: ...MAN B W MAN Diesel Exhaust Gas 15 ...
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Page 265: ...MAN B W MAN Diesel Engine Control System 16 ...
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Page 275: ...MAN B W MAN Diesel Vibration Aspects 17 ...
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Page 289: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18 ...
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Page 313: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19 ...
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Page 339: ...MAN B W MAN Diesel Project Suppport and Documentation 20 ...
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Page 349: ...MAN B W MAN Diesel Appendix A ...
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