MAN B&W
6.04
Page of 12
MAN Diesel
MAN B&W MC/MC-C engines
198 61 76-4.0
Exhaust Gas Amount and Temperature
Influencing factors
The exhaust gas data to be expected in practice
depends, primarily, on the following three factors:
a) The specified MCR point of the engine (point M):
P
M
: power in kW at SMCR point
n
M
: speed in r/min at SMCR point
and to a certain degree on the optimising point
O with the percentage power P
O%
= % of SMCR
power:
P
O%
= (P
O
/P
M
) x 100%
b) The ambient conditions, and exhaust gas
backpressure:
T
air
: actual ambient air temperature, in °C
p
bar
: actual barometric pressure, in mbar
T
CW
: actual scavenge air coolant temperature,
in °C
∆
p
M
: exhaust gas backpressure in mm WC at
specified MCR
c) The continuous service rating of the engine
(point S), valid for fixed pitch propeller or control-
lable pitch propeller (constant engine speed):
P
S
: continuous service rating of engine, in kW
Calculation Method
To enable the project engineer to estimate the ac-
tual exhaust gas data at an arbitrary service rating,
the following method of calculation may be used.
The partial calculations based on the above influ-
encing factors have been summarised in equations
[4] and [5].
Fig. 6.04.06: Summarising equations for exhaust gas amounts and temperatures
The partial calculations based on the influencing
factors are described in the following:
a) Correction for choice of specified MCR point
When choosing a specified MCR point ‘M’ other
than the nominal MCR point ‘L
1
’, the resulting
changes in specific exhaust gas amount and
temperature are found by using as input in dia-
grams the corresponding percentage values (of
L
1
) for specified MCR power P
M%
and speed n
M%
:
P
M%
= P
M
/P
L1
x 100%
n
M%
= n
M
/n
L1
x 100%
M
exh
= M
L1
x
P
M
___
P
L1
x 1 +
∆
m
M%
______
100
x 1 +
∆
M
amb%
_______
100
x 1 +
∆
m
s%
_____
100
x
P
S%
____
100
kg/h
+/5% [4]
T
exh
= T
L1
+
∆
T
M
+
∆
T
O
+
∆
T
amb
+
∆
T
S
°C /+15 °C
[5]
where, according to ‘List of capacities’, i.e. referring to ISO ambient conditions and 300 mm WC
backpressure and specified/optimised in L
1
:
M
L1
: exhaust gas amount in kg/h at nominal MCR (L
1
)
T
L1
: exhaust gas temperature after turbocharger in °C at nominal MCR (L
1
)
M
exh
: exhaust gas amount in kg/h, to be found
T
exh
: exhaust gas temperature in °C, to be found
Summary of Contents for B&W L35MC6-TII
Page 4: ......
Page 10: ......
Page 18: ......
Page 19: ...MAN B W MAN Diesel Engine Design 1 ...
Page 20: ......
Page 35: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2 ...
Page 36: ......
Page 52: ......
Page 64: ......
Page 65: ...MAN B W MAN Diesel Turbocharger Selection Exhaust Gas By pass 3 ...
Page 66: ......
Page 72: ......
Page 73: ...MAN B W MAN Diesel Electricity Production 4 ...
Page 74: ......
Page 95: ...MAN B W MAN Diesel Installation Aspects 5 ...
Page 96: ......
Page 132: ......
Page 146: ......
Page 147: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6 ...
Page 148: ......
Page 171: ...MAN B W MAN Diesel Fuel 7 ...
Page 172: ......
Page 186: ......
Page 187: ...MAN B W MAN Diesel Lubricating Oil 8 ...
Page 188: ......
Page 203: ...MAN B W MAN Diesel Cylinder Lubrication 9 ...
Page 204: ......
Page 213: ...MAN B W MAN Diesel Piston Rod Stuffing Box Drain Oil 10 ...
Page 214: ......
Page 215: ......
Page 217: ...MAN B W MAN Diesel Central Cooling Water System 11 ...
Page 218: ......
Page 223: ...MAN B W MAN Diesel Seawater Cooling System 12 ...
Page 224: ......
Page 234: ......
Page 235: ...MAN B W MAN Diesel Starting and Control Air 13 ...
Page 236: ......
Page 242: ......
Page 243: ...MAN B W MAN Diesel Scavenge Air 14 ...
Page 244: ......
Page 256: ......
Page 257: ...MAN B W MAN Diesel Exhaust Gas 15 ...
Page 258: ......
Page 272: ......
Page 273: ...MAN B W MAN Diesel Engine Control System 16 ...
Page 274: ......
Page 289: ...MAN B W MAN Diesel Vibration Aspects 17 ...
Page 290: ......
Page 304: ......
Page 305: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18 ...
Page 306: ......
Page 328: ......
Page 329: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19 ...
Page 330: ......
Page 360: ......
Page 361: ...MAN B W MAN Diesel Project Suppport and Documentation 20 ...
Page 362: ......
Page 371: ...MAN B W MAN Diesel Appendix A ...
Page 372: ......