MAN B&W S65ME-C8.2-GI-TII, Project Manual

Page: 163 / 395

MAN B&W 6.04
Page 12 of 12
MAN Diesel MAN B&W S65ME-C8.2-GI-TII 198 88 45-0.1
Exhaust gas data at specified MCR (ISO)
At specified MCR (M), the running point may be in
equations [4] and [5] considered as a service point
where P
S%
= 100,
Δ
m
s%
= 0.0 and
Δ
T
s
= 0.0.
For ISO ambient reference conditions where
Δ
M
amb%
= 0.0 and
Δ
T
amb
= 0.0, the corresponding
calculations will be as follows:
M
exh,M
= 147,600 x
15,498
_____
17,220
x (1 +
-0.26 ____
100
) x (1 +
0.0 ___
100
)
x (1 +
0.0 ___
100
) x
100.0 ____
100
= 132,461 kg/h
M
exh,M
= 132,500 kg/h ±15%
T
exh,M
= 230 - 3.9 + 0 + 0 = 226.1 °C
T
exh,M
= 226.1 °C ±5 °C
The air consumption will be:
132,461 x 0.982 kg/h = 130,077 kg/h <=>
130,077 / 3,600 kg/s = 36.1 kg/s
Final calculation
By means of equations [4] and [5], the final result is
found taking the exhaust gas flow M
L1
and tempera-
ture T
L1
from the ‘List of Capacities’:
M
L1
= 147,600 kg/h
M
exh
= 147,600 x
15,498
_____
17,220
x (1 +
-0.26 ____
100
) x
(1 +
1.11 ___
100
) x (1 +
7.1 ___
100
) x
80 ___
100
= 114,781 kg/h
M
exh
= 114,800 kg/h ±15%
The exhaust gas temperature
T
L1
= 230 °C
T
exh
= 230 - 3.9 8.8 18.8 = 198.5 °C
T
exh
= 198.5 °C ±5 °C
a) Correction for choice of specified MCR point M:
P
M%
=
15,498
_____
17,220
x 100 = 90.0%
n
M%
=
90.3 ____
95.0
x 100 = 95.0%
By means of Figs. 6.04.07 and 6.04.08:
Δ
m
M%
= -0.26%
Δ
T
M
= -3.9 °C
b) Correction for ambient conditions and
backpressure:
By means of equations [7] and [8]:
Δ
M
amb%
= 0.41 x (20 25) + 0.03 x (1,013 1,000)
+ 0.19 x (18 25) 0.011 x (300 300)%
Δ
M
amb%
= + 1.11%
Δ
T
amb
= 1.6 x (20 25) 0.01 x (1,013 1,000)
+ 0.1 x (18 25) + 0.05 x (300 300) °C
Δ
T
amb
= 8.8 °C
c) Correction for the engine load:
Service rating = 80% of specified MCR power
By means of Figs. 6.04.11 and 6.04.12:
Δ
m
S%
= + 7.1%
Δ
T
S
= 18.8 °C