Fancy a duel fuel engine

sailorman

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Controllable Pitch Propeller Wartsila
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Controllable Pitch Propeller by Wartsila

Wärtsilä announced today they have been contracted to supply the complete dual-fuel propulsion package for two 4700 CBM Liquefied Ethylene Gas (LEG)/Liquefied Petroleum Gas (LPG) tankers being built for Netherlands-based gas transportation company Anthony Veder. Construction began this past September at Avic-Dingheng Shipbuilding in Yangzhou, China with an expected delivery date of mid-2014.

The Wärtsilä dual-fuel 34DF main and 20DF auxiliary engines will allow the ships to operate on liquefied natural gas (LNG), which minimizes their environmental footprint. However, fuel flexibility, a primary benefit of the Wärtsilä DF engine technology, means that conventional marine diesel fuels can also be used if required. The switch between fuel types is made seamlessly without loss of power or speed.

The use of Wärtsilä’s dual-fuel engine technology will enable these tankers to sail without restrictions in Sulphur Emission Control Areas (SECAs) and Nitrogen Emission Control Areas (NECAs). Natural gas is the most environmentally-sound fuel today, and it fulfils current actual and known future marine emissions legislation coming into force in 2016.

“We are delighted to supply these new tankers with Wärtsilä’s dual-fuel engine technology, which will enable them to operate safely, economically, and sustainably on LNG fuel. This order strengthens our position as the market leader in terms of LNG fuelled propulsion machinery,” says Aaron Bresnahan, Vice President, Wärtsilä Ship Power, Sales.

The propulsion package, which includes the main and auxiliary engines, gear boxes and controllable pitch propellers, will be delivered to the yard in June 2013. Upon final commissioning and delivery by the shipyard, the ships will be operated on contract in the North Sea region.
 
Makes sense when transporting LPG to use it as propulsion fuel

I seem to recall a friend of mine who was on the North Africa to Canvey Island gas run telling me that they used the bleed off of LPG to drive the ship about 30 odd years ago so hardly a new process (unless he meant to fire the boilers of course).
 
I have witnessed a surprisingly large number of gas turbine wrecks caused by failure of dual-fuel changeover valves. It seems the diesel valve cokes up regularly and when asked to close, only partially does so. The gas valve then opens and the engine runs briefly on gas and liquid fuel, resulting in severe burning of turbine blades when the coolant passages coke up. Maybe Wartsila have some clever technology that overcomes this?
 
I have witnessed a surprisingly large number of gas turbine wrecks caused by failure of dual-fuel changeover valves. It seems the diesel valve cokes up regularly and when asked to close, only partially does so. The gas valve then opens and the engine runs briefly on gas and liquid fuel, resulting in severe burning of turbine blades when the coolant passages coke up. Maybe Wartsila have some clever technology that overcomes this?

The Wartsila is a diesel ( i think)
 
I have witnessed a surprisingly large number of gas turbine wrecks caused by failure of dual-fuel changeover valves. It seems the diesel valve cokes up regularly and when asked to close, only partially does so. The gas valve then opens and the engine runs briefly on gas and liquid fuel, resulting in severe burning of turbine blades when the coolant passages coke up. Maybe Wartsila have some clever technology that overcomes this?

They have done it on 2000 previous occasions so I suspect they have sussed out control valve problems:D:D

The full PR release says more.


http://www.lngworldnews.com/the-net...dual-fuel-propulsion-package-for-lpg-tankers/
 
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