The temperature control valves are equipped with a hand wheel for emergency operation.
4.2.14 Turbocharging and charge air cooling
The SPEX (Single Pipe EXhaust system) turbocharging system combines the advantages of
both pulse and constant pressure systems. The complete exhaust gas manifold is enclosed
by a heat insulation box to ensure low surface temperatures.
In-line engines have one turbocharger and V-engines have one turbocharger per cylinder bank.
The turbocharger(s) are installed transversely, and are placed at the free end of the engine.
Vertical, longitudinally inclined, and horizontal exhaust gas outlets are available.
In order to optimize the turbocharging system for both high and low load performance, as well
as diesel mode and gas mode operation, a pressure relief valve system “waste gate” is installed
on the exhaust gas side. The waste gate is activated at high load.
The charge air cooler is as standard of 2-stage type, consisting of HT- and LT-water stage.
Fresh water is used for both circuits.
For cleaning of the turbocharger during operation there is, as standard, a water-washing device
for the air side as well as the exhaust gas side.
The turbocharger is supplied with inboard plain bearings, which offers easy maintenance of
the cartridge from the compressor side. The turbocharger is lubricated by engine lubricating
oil with integrated connections.
4.2.15 Automation system
Wärtsilä 46DF is equipped with a modular embedded automation system, Wärtsilä Unified
Controls - UNIC.
The UNIC system have hardwired interface for control functions and a bus communication
interface for alarm and monitoring. A engine safety module and a local control panel are
mounted on the engine. The engine safety module handles fundamental safety, for example
overspeed and low lubricating oil pressure shutdown. The safety module also performs fault
detection on critical signals and alerts the alarm system about detected failures. The local
control panel has push buttons for local start/stop and shutdown reset, as well as a display
showing the most important operating parameters. Speed control is included in the automation
system on the engine.
All necessary engine control functions are handled by the equipment on the engine, bus
communication to external systems, a more comprehensive local display unit, and fuel injection
control.
Conventional heavy duty cables are used on the engine and the number of connectors are
minimised. Power supply, bus communication and safety-critical functions are doubled on
the engine. All cables to/from external systems are connected to terminals in the main cabinet
on the engine.
4.2.16 Variable Inlet valve Closure
Variable Inlet valve Closure (VIC), offers flexibility to apply early inlet valve closure at high load
for lowest NOx levels, while good part-load performance is ensured by adjusting the advance
to zero at low load. The inlet valve closure can be adjusted up to 30° crank angle.
DBAD209883 4-5
4. Description of the EngineWärtsilä 46DF Product Guide
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