Several advancements have occurred in the maritime sector in the past, mostly for the development of waste energy recovery systems such as economisers, turbochargers, and so on. A maritime technological invention has advanced research to a whole new level. It’s known as the Hybrid Turbocharger.
Mitsubishi Heavy Industries created a hybrid turbocharger that varies from traditional turbochargers in terms of waste recovery and fuel savings. Exhaust gas output is collected and used to power the compressor, which provides scavenge air to the main engine and also generates electricity via an alternator connection included in the MET hybrid turbocharger.
Requirements
Three fundamental components are required for a hybrid turbocharger:
- A standard turbocharger with a longer shaft to allow an alternator at the blower end.
- A specifically built extremely small alternator capable of operating at a high speed of about 9000 rpm.
- A cooling system for the alternator, as the heat generated will be greater due to its small size at the specified rpm.
Construction
To support the alternator within the turbocharger silencer, a two-part shell made of cast steel is added to the blower side scroll, which is constructed with greater stiffness.
The lower half shell is fitted first, and it is designed to function as a sump for collecting lubricating oil released by the alternator. The intake filter and silencer are placed above the alternator assembly with enough space between them to allow air to flow through the shell and into the compressor blades.
An aluminium cooling water jacket is placed around the rotor winding, and external cooling air is also supplied at the extreme ends and centre of the windings. Special d is used to link the alternator and compressor.
Working
The operation is identical to that of any other generator, except the prime mover, which is a turbocharger in and of itself.
The voltage and frequency of the generator are determined by the speed of the prime mover. An initial DC power supply is given to obtain the appropriate output voltage and frequency.
At 9500 KW, the hybrid system can generate around 756 KW, which is sufficient to carry the whole sea load of a typical size container ship.
Advantages
- Enough power may be obtained from the main engine running with only a minor increase in size.
- The heat exchange system is utilised to drive the alternator, which saves fuel.
- At light load, the generator can act as a motor, driving a blower to keep the main engine’s scavenging air pressure constant.
- Remove the installation of an auxiliary blower for the primary engine.
- Because no extra fuel is utilised, the ship’s emissions are reduced.
Useful links
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Remanufactured Turbo Specialists NOT Reconditioned Turbos (precisionturbos.co.uk)
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