a diesel engine and hence does not require the boil-off gas treatment equipment as is required for more conventional large-scale LNG carriers. The following month KHI delivered the LPG
carrier Crystal Sunrise to Kumiai Navigation. This 82,200m3 vessel is the first LPG carrier to have the Sea-Arrow bow design developed by Kawasaki to minimise bow wave resistance. Propulsive power is provided by an ultra-long-stroke two-stroke diesel engine with efficiency further increased by the adoption of KHI’s innovative rudder bulb and duct system which enhances propeller efficiency. But
steam turbine powered carriers still
remain a key product for KHI and application of the company’s advanced reheat turbine plant has increased vessel efficiencies. One of the most recent deliveries has been that of the LNG carrier Grace Dahlia to NYK. With a storage capacity of 177,427m3, this is the largest Moss-type LNG carrier currently in operation and the second of its type to be delivered by KHI. This increase was achieved by expanding the size of the four spherical LNG tanks.
Propulsive power is provided by KHI’s
Advanced Reheat Turbine Plant, designated as the URA plant, which was developed specially for application in LNG carriers. The plant incorporates a reheat cycle with steam taken from the high pressure turbine exhaust being returned to the boiler for further heating before being sent on to a medium pressure turbine stage.
This cycle, which uses a high pressure and temperature boiler, achieves a dramatic increase in thermal efficiency. As a result, fuel consumption is reduced, with KHI claiming an improvement in the order of 15 per cent compared to more conventional steam turbine plants.
The first vessel of this type produced by KHI
was the Energy Horizon, which has a length of 300m, breadth of 52m and a gross register of 143,000gt. The vessel was built at the Sakaide Shipyard of the Kawasaki Shipbuilding Corp and went into operation in 2011 for NYK Line and Tokyo LNG Tanker Co (TLT).The Panamax vessel was the 10th LNG tanker in the TLT fleet and initially targeted at LNG transport for developments such as the Pluto project in western Australia. Energy Horizon is managed by NYK and chartered to TLT for a 20-year period. KHI conventional marine steam turbine plants are available in 10 basic frame sizes, starting with the UA-120 with outputs from 5,800kW to 8,800kW. At the high end of the range, the UA-500 delivers a maximum output of 36,800kW from a package weighing a total of 360 tonnes. Propeller shaft speeds range between 80 and 125 rpm, corresponding to the normal requirements of LNG carriers. The URA reheat turbine plants are available in four frame sizes, with the lowest output at 20,600kW and the highest at 36,800kW. Shaft speeds are configured at between 80 and 90 rpm. MP
www.mpropulsion.com Energy Horizon, to be fitted with KHI’s Advanced Reheat Turbine Plant (credit: KHI)
pioneering
With Becker’s two newly developed LNG concepts, the company is proving once again its innovative spirit on behalf of our environment. The Wadden Sea Ferry with its ground-breaking LNG HYBRID drive signifi cantly reduces the negative impact of passenger shipping on shallow European coastal waters. Additionally, the LNG HYBRID Barge generates energy for cruise ships lying in port. Compared to the current method of producing energy using their on-board diesel engines, the implementation of power supply by the LNG HYBRID Barge will lead to a dramatic reduction of harmful particle emissions during harbour layovers.
WWW.BECKER-MARINE-SYSTEMS.COM
Visit us at Electric & Hybrid Marine World Expo, Amsterdam, Netherlands, hall 11, booth no. 1750, 24th
-26th June 2014
Marine Propulsion I April/May 2014 I 43
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