Page 45: of Marine News Magazine (July 2016)

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PROPULSION: EMISSIONS

Karl Senner explains, “Both are ter- source onboard. high amount operating hours in low ri? c options and both are backed by The Boost mode offers an addi- load demand, the Harbor Tug opera-

Karl Senner parts and service. The tional operating mode in PTI opera- tor can switch to Hybrid mode and

EPD option is a great ? t on all Steer- tion. Using all the power of both the turn off the main engines when they prop and Reintjes projects that exceed diesel engine and the electric motor are not needed. By keeping the main 630kw. For smaller inland Diesel-elec- in combination to drive the propeller engines off throughout the majority tric z-drive tow boats we have a great to provide maximum propeller thrust of the vessel’s operating life, large cost system used on over 100 DP2 vessels and /or support the diesel engine in savings can be realized by creating utilizing simple and affordable AC and different load conditions. much longer overhaul intervals of the

DC solutions. EPD’s John Norwood In the PTO (Power Take Off) main engines.” says it all comes down to what’s right mode, the electric motor of the RE- Karl Senner has sold and installed for the individual customer. “What INTJES hybrid system can be operat- many gearboxes with PTO/PTI/ we offer is all tailored towards the ed as a generator. It then feeds electric Booster capability – mainly for off- customer’s requirements, operational power into the ship’s grid and, hence, shore applications – but historically, a pro? le, budget and marketing plan.” assists existing generator sets. Option- third party would supply the electri-

Either selection can be integrated with ally, the remaining energy can be fed cal system. It wasn’t until recently that any engine manufacturer. into batteries and used later. Reintjes decided to make the packag-

Karl Senner sums up the advan- ing easier and integrate the full system

Reintjes Hybrid System Explained tages of the hybrid approach, say- from one source. For example, the

The REINTJES Hybrid System of- ing simply, “Harbor Tugs are a great most recent vessel to have a Reintjes fers many different operation modes. ? t for the Hybrid applications due Gearboxes that were PTO/PTI-ready

Easy switching between the electric to their operating pro? le. Given the was the M/V Harvey Stone. motor/generator, using the main en- gine, the genset, or both by means of the hydraulically operated clutches, enables the vessel to optimally use its power and take full advantage of the gearbox and the entire power train.

These operating modes include PTI mode (electric motor only), PTO mode (diesel engine for propulsion and shaft generator), Boost mode (electric motor and diesel engine in combination for higher speed and higher thrust) and the Diesel mode (diesel engine only). Each offers its own advantages, depending on opera- tional needs at any one given time.

The PTI (Power Take In) mode provides maximum comfort at slow speed. With the diesel engine not operating, the electric motor of the

REINTJES hybrid system drives the ship and enables normal cruis- ing, maneuvering and reversing. The noise level and the energy consump- tion of the power train are reduced to a minimum and ef? cient operation is achieved with power coming from the genset or any other electric power 45 www.marinelink.com MN

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