Marine Installation Manual 2022-03 4-8
4 Ancillary Systems
4.2 The iCER
X62DF-S2.0
4.2.2 Heat recovery (economiser)
An additional economiser can be placed upstream of the EGC, therefore en-
suring the necessary steam production. By adding this additional economiser,
the thermal energy from the exhaust gas can be utilised. The economiser can be
installed directly to the steam line.
The on-board steam requirement must be calculated carefully before considering
this additional economiser, as less steam production power is generally required
during gas operation.
Figure 4-6 Arrangement of the additional economiser (Source: Alfa Laval)
To keep this additional economiser compact, a direct connection to the main
economiser is required. For this reason, there is no need to include its own water
drum.
If the iCER is active in gas mode, the exhaust gas is essentially considered to be
sulphur free. As a result, there is no restriction on the additional and main econ-
omiser in reducing the exhaust gas below 160-170 °C. Even in diesel Tier III
mode operation, the lower exhaust gas temperature may be selected as the sul-
phur content in the fuel is limited to 0.10 % m/m sulphur. Also, the additional
and main economiser, as well as the downstream exhaust gas pipe are made of
stainless steel (or alternative corrosion-resistant material).
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