Marine Installation Manual 2022-03 4-7
4 Ancillary Systems
4.2 The iCER
X62DF-S2.0
The iCER system is positioned next to the main engine. It recirculates part of the
exhaust gas after the turbine (along a low-pressure path) through the EGC and
back to the compressor inlet. The exhaust gas and the fresh air are mixed before
entering the turbocharger at the compressor inlet. For further information
see The iCER exhaust gas system,  4-102. The amount of returned exhaust gas
is regulated in a closed loop control with a maximum possible exhaust gas recir-
culation of approximately 50 %. Compared to a high-pressure path, the low-pres-
sure path allows the turbocharger to run at full capacity.
The EGC cools the exhaust gas before it re-enters the turbocharger. The EGC
produces a constant water spray that absorbs a majority of the heat as the exhaust
gas passes through it. This process also cleans the exhaust gas. After this, the ex-
haust gas passes through the second cooling stage of the EGC, which is com-
prised of heat exchange surfaces made of steel. This limits the amount of water
carried by the exhaust gas. For single turbocharger installations, a Water Mist
Catcher (WMC) is installed to ensure removal of these potential water droplets.
The drain arrangement is integrated into the engine. For installations with two
turbochargers, the exhaust gas return pipe must be routed below the level of the
turbochargers. This prevents water droplets in the exhaust gas flow, or water
condensate on the pipe wall, from being carried over to the turbochargers. Con-
densate water drains must be arranged at the lowest point of the horizontal re-
turn manifold pipe. Different vessel trim conditions must be considered.
For the water treatment system see section 4.3.7 The EGC circulation water
system,  4-22 and section 4.9.4 The iCER drainage system,  4-96.
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