Correction Of Exhaust Gas Data For Ambient Conditions And Exhaust Gas Back Pressure; Correction For Actual Ambient Conditions And Back-Pressure - Man B&W S80ME-C7 Project Manual

MAN B&W Diesel A/S
Specified MCR
power, % of L
1
P
M%
110%
100%
90%
2%
80%
3
70%
60%
50%
4
40%
70% 75% 80%
∆m
= 14 x ln (P /P
M% M L 1
Fig. 6.04.07: Change of specific exhaust gas amount,
∆ m
in % of L value and independent of P
M% 1
∆m
: change of specific exhaust gas amount,
M%
in % of specific gas amount at nominal
MCR (L ), see Fig. 6.04.07.
1
∆T
: change in exhaust gas temperature after
M
turbocharger relative to the L1 value, in °C,
see Fig. 6.04.08. (P
∆T
: extra change in exhaust gas temperature
O
when matching point O lower than 100% M:
P = (P /P
O% O M
∆T
= - 0.3 x (100 - P
O
Parameter
Blower inlet temperature
Blower inlet pressure (barometric pressure)
Charge air coolant temperature
(seawater temperature)
Exhaust gas back pressure at the specified MCR point
Fig. 6.04.09: Correction of exhaust gas data for ambient conditions and exhaust gas back pressure
K90ME, S80ME-C, S70ME-C/ME-GI, S60ME-C/ME-GI, S50ME-C
1
0%
-1%
1%
-2%
-3%
M
-4%
m
-5%
M%
-6%
2
85% 90% 95% 100% 105%
Specified MCR engine speed, % of L
) – 24 x ln (n /n )
M L 1
O
= P )
O M
) x 100%.
) [6]
O%
Specified MCR
power, % of L
P
M%
110%
100%
90%
80%
70%
60%
50%
40%
110% n 70%
M%
1
∆T
= 15 x ln (P
M
178 51 09-5.0
Fig. 6.04.08: Change of exhaust gas temperature, ∆ T
point M, in °C after turbocharger relative to L
valid for P
b) Correction for actual ambient conditions and
back-pressure
For ambient conditions other than ISO 3046/1
1995 (E), and back-pressure other than 300 mm
WC at specified MCR point (M), the correction
factors stated in the table in Fig. 6.04.09 may be
used as a guide, and the corresponding relative
change in the exhaust gas data may be found
from equations [7] and [8], shown in Fig. 6.04.10.
Change
+ 10° C
+ 10 mbar
+ 10° C
+ 100 mm WC
1
M
3
T
m
-12 C
-14 C
-16 C
-18 C
-20 C
-22 C
4
75% 80% 85% 90%
Specified MCR engine speed, % of L
/P ) + 45 x ln (n
M L 1
= P
O M
Change of
exhaust gas
temperature
+ 16.0° C
- 0.1° C
+ 1.0° C
+ 5.0° C
6.04
Page 9 of 12
1
0%
-2%
-4%
-6%
-8 C 2
-10 C
95% 100% 105% 110% n
M%
1
/n )
M L 1
178 51 12-9.0
in
M
value and
1
Change of
exhaust gas
amount
- 4.1 %
+ 0.3 %
+ 1.9 %
-1.1 %
198 44 22-2.1