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Niels Bjørn Mortensen NBM@BIMCO

Reduction of Green House Gas Emissions from Ships. Niels Bjørn Mortensen NBM@BIMCO.org. Tripartite Meeting Tokyo 2007. Reduction of Green House Gas Emissions from Ships. Green House Gas (GHG) emissions will in presentation be limited to CO 2 .

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Niels Bjørn Mortensen NBM@BIMCO

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  1. Reduction of Green House Gas Emissions from Ships Niels Bjørn Mortensen NBM@BIMCO.org Tripartite Meeting Tokyo 2007

  2. Reduction of Green House Gas Emissions from Ships • Green House Gas (GHG) emissions will in presentation be limited to CO2. • CO2 is produced whenever burning fossile fuels. • The amount of CO2 is depending on the specific fossile fuel. • In general one ton of fuel produces 3.0 – 3.2 ton of CO2

  3. Demand for reduced GHG Emissions? • Green House Gas (GHG) emissions from ships were not included in the Kyoto Protocol but left to the Maritime Industry at large to solve through IMO. • The Industry needs to be pro-active. • Otherwise – someone outside the business may tell us what to do! • Owners have room for improvement – but needs help from the entire maritime business. • Improvements in this context is higher efficiency as it means lower emissions in general! • An obvious way to reduce emissions in to reduce the speed of the ships, however, that may not be a sustainable solution.

  4. Reduction of Green House Gas Emissions from Ships • Technologies: Fuel Savings: • Waste Heat Recovering (WHR) 7-12% • Air Cavity System (ACS) 7-15% • Twin propeller 5-10% • Interceptor transom plate 3- 8% • Bulb and stem modifications 3- 7% • Stabiliser fin box modifications 3-10% • Rudder head box and design modifications 2- 5% • Shaft line modifications 2- 4% • New propeller blades 1- 4% • Additives 2- 5% • Total savings between: 30-57% • (If all measures are implemented and can work in harmony)

  5. Reduction of Green House Gas Emissions from Ships • This presentation will concentrate on two of the suggested measures: • Waste Heat Recovery • Air Cavity System

  6. Why waste heat recovery? • About 50% of the fuel input energy is not being put to productive use. • Recovering part of the wasted energy provides the vessel with: • lower fuel consumption • lower emissions

  7. Why waste heat recovery? Standard Engine with Heat Recovery Heat Balance RTA96C Engine ISO conditions, 100% load Total 54.9% Engine efficiency improvement with heat recovery = 54.9 / 49.3 = 11.4%

  8. Why waste heat recovery? • The application of a waste heat recovery system is threefold: • The operator profits from a lower annual fuel bill • The operator contributes to lower emissions, such as CO2, NOX and SOX • The operator benefits from being more competitive in the freight market

  9. How is wasted energy recovered? • Using exhaust gas energy to generate steam to operate a steam turbine. • Steam turbine drives a generator. • Generator feeds into the main switchboard.

  10. Shaft generator Fuel saving 7 - 12 % depending on sophistication of heat recovery plant

  11. Exhaust gas boiler

  12. Virtual Installation

  13. Virtual Installation

  14. Principal arrangement of power / steam turbogenerator package

  15. Shaft generator

  16. WHR – System Benefits

  17. Air Cavity System:

  18. Air Cavity System:

  19. Air Cavity System:

  20. Air Cavity System – Midship Section

  21. Air Cavity System: Additional Shell Plating Additional Floor Plating Area equivalent to basis vessel

  22. Case study: 115,000 DWT tanker modified for ACS Principal DimensionsConsumables Length over all 250.00 m Heavy fuel oil 2800 m3 Length between pp 240.00 m Marine diesel oil 185 m3 Breadth, moulded 44.20 m Lubricating oil 130 m3 Depth, moulded 21.70 m Fresh water 410 m3 Design draught 14.90 m Ballast water 44,200 m3 Speed, service, 15 % s.m. 15.0 kn Cargo capacity: Installed power: 15,230 BHP Cargo tanks 1 to 5, P+S 130,200m3 Fuel consumption: 1.56 t/h Slop tanks P+S 2,200 m3 Deadweight Displacement at design draught: 134,600 t Est. lightweight 18,900 t

  23. Case study: 115,000 DWT tanker modified for ACS

  24. Reduction of Green House Gas Emissions from Ships • Shipping needs to be pro-active in the endeavour • to limit GHG emissions. • Shipowners cannot do this alone. • We need the cooperation and innovative abilities • of ship-designers and shipyards. • We also need our charterers to accept ships • of novel designs and with novel features.

  25. Reduction of Green House Gas Emissions from Ships BIMCO would like to thank the following: • Siemens • Wärtsilä • Peter Brotherhood Ltd • Aalborg Boilers • DK Group

  26. Reduction of Green House Gas Emissions from Ships Thank you Questions?

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