Exhaust Gas Correction Formula For Ambient Conditions And Exhaust Gas Back Pressure; Correction For Engine Load - Man B&W S80ME-C7 Project Manual

MAN B&W
∆M
=  0.41 x (T
amb%
∆T
= 1.6 x (T
amb air
where the following nomenclature is used:
∆M
: change in exhaust gas amount, in % of amount at ISO conditions
amb%
∆T
: change in exhaust gas temperature, in °C compared with temperatures at ISO conditions
amb
Fig. 6.04.10: Exhaust gas correction formula for ambient conditions and exhaust gas back pressure
m S%
%
16
14
12
10
8
6
4
2
0
-2
-4
50 60 70
P = (P /P ) x 100%
S% S M
∆m
= 37 x (P /P )  83 x (P
3
S% S M
Fig. 6.04.11: Change of specific exhaust gas amount,
∆m
in % at part load, and valid for FPP and CPP
s%
c) Correction for engine load
Figs. 6.04.11 and 6.04.12 may be used, as
guidance, to determine the relative changes
in the specific exhaust gas data when running
at part load, compared to the values in the
specified MCR point, i.e. using as input P
(P /P ) x 100%:
S M
MAN B&W MC/MCC, ME/ME-B/MEC/MEGI engines
 25) + 0.03 x (p
air bar
 25)  0.01 x (p  1000) +0.1 x (T
bar
M
80 90 100
Engine load, % specified MCR power
/P ) + 31 x (P /P
2
S M S
 1000) + 0.19 x (T  25 )  0.011 x (∆p
CW
 25) + 0.05 x (∆p
CW
T S
20
15
10
5
0
-5
-10
-15
50
110 P S%
178 24 623.0
P = (P
S%
∆T
) + 15 = 262 x (P
M S
Fig. 6.04.12: Change of exhaust gas temperature,
∆T
in °C at part load, and valid for FPP and CPP
S
∆m
: change in specific exhaust gas amount,
s%
∆T
= : change in exhaust gas temperature, in °C,
S% s
MAN Diesel
 300) %
M
 300) °C
M
60 70 80
Engine load, % specified MCR power
/P ) x 100%
S M
/P )  413 x (P
2
S M
in % of specific amount at specified MCR
point, see Fig. 6.04.11.
see Fig. 6.04.12.
6.04
Page 10 of 12
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[8]
M
P S%
90 100 110
178 24 635.0
/P ) + 151
S M
198 43 203.3