Man L23/30DF, Project Manual

Page: 230 / 392

Exhaust gas boiler
To utilize the thermal energy from the exhaust, an
exhaust gas boiler producing steam or hot water
can be installed.
Each engine should have a separate exhaust gas
boiler or, alternatively, a common boiler with sepa-
rate gas ducts. Concerning exhaust gas quantities
and temperature,
see "List of capacities" D 10 05 0,
and "Engine performance" D 10 10 0.
The discharge temperature from the exhaust gas
boiler should not be lower than 180°C (in order to
avoid sulphuric acid formation in the funnel).
The exhaust gas boilers should be installed with by-
pass entering in function at low-load operation.
The back-pressure over the boiler must be included
in the back-pressure calculation.
Expansion bellows
The expansion bellows, which is supplied sepa-
rately, must be mounted directly on the exhaust gas
outlet, see also E 16 01 1-2.
Exhaust silencer
The position of the silencer in the exhaust gas pip-
ing is not decisive for the silencing effect. It would
be useful, however, to fit the silencer as high as
possible to reduce fouling. The necessary silencing
depends on the loudness of the exhaust sound and
the discharge from the gas outlet to the bridge
wing.
The exhaust silencer,
see E 16 04 2-3-5-6, is sup-
plied loose with counterflange, gaskets and bolts.
MAN Diesel & Turbo
B 16 00 0
Exhaust gas system
1655213-2.6
Page 2 (4)
L28/32S, L27/38S, L23/30S, L21/31S, L16/24S, L23/30DF, L28/32DF, L16/24,
L21/31, L23/30H, L27/38, L28/32H
2015.01.14