UlCS with asc powerpoint rev.a DKGROUP

Knud E. Hansen A/S

Ultra Large Container Ships

Saving Fuel by Reducing the Hull Friction Resistance with ACS

A Presentation by DK Group Na.Nv.

& Knud E. Hansen A/S

Knud E. Hansen A/S

12,670 TEU Container Ship

Present Design

Loa.: 400.0 m Lpp.: 378.0 m B: 54.2 m Depth: 29.0 m Draft: 14.5 m Speed: 25.5 kn Power: 2 x 57 MW

Knud E. Hansen A/S


Present Design

Knud E. Hansen A/S


Present Design Lightweight 53,000 T

Deadweight (draught 14.5 m) 152,000 T

Displacement (draught 14.5 m) 205,000 T

HFO capacity 17,300 m3

Range – 25.5 kn, 15% sea margin, 85% MCR, 13 m draft 26,500 nm

BW capacity 63,000 m3

Number of Container Positions (TEU): On hatches: 6,410 TEU

In Holds: 6,260 TEU

Total: 12,670 TEU

Loading Condition 1 (14 T/TEU - no water ballast):

On hatches: 14 T/TEU 3,300 TEU ~ 46,200 T

In holds: 14 T/TEU 6,260 TEU ~ 87,640 T

Total: 9,560 TEU ~ 133,840 T

Loading Condition 2 (no water ballast):



On hatches: 14 T/TEU 720 TEU ~ 10,080 T

In holds: 14 T/TEU 6,260 TEU ~ 87,640 T

Total: 12,670 TEU ~ 133,870 T

Knud E. Hansen A/S


Propulsion Alternatives: •  Single-propeller – single engine

•  Twin-propellers – twin engines •  Contra rotating propellers

Knud E. Hansen A/S


Propulsion Alternatives: •  Single-propeller – single-engine

Theoretical advantages: •  Low installation costs

Technical problems:

•  Very low propulsion efficiency and severe risk of cavitation •  A propeller size of approximately 11.5 m – 12 m with 4 - 6

blades and a weight of 200 t can not be produced today •  Building a 125 MW engine is possible but difficult. (Largest

engines today: 14 cylinders, 98 cm bore, 81 MW) •  The engine will be so long that it might participate in the

longitudinal strength of the hull •  Thrust block and propeller bearing will be huge •  No redundancy

CONCLUSION: Feasible for a 23 kn vessel, but not for a 25.5 kn vessel!

Knud E. Hansen A/S


Propulsion Alternatives: •  Twin-propellers – twin engines

Advantages: •  Reliability because of well proven components •  Short main engines (21 m) •  Reasonable propeller size •  High propulsion efficiency and thereby low fuel costs •  Full redundancy •  Low maintenance costs & limited number of spare parts •  Better manoeuvrability than single-propeller solution

Disadvantages:

•  Relatively high installation costs

Knud E. Hansen A/S


Propulsion Alternatives: •  Contra rotating propellers

• Mechanical solution • Azipod solution

Knud E. Hansen A/S


Propulsion Alternatives: •  Contra rotating propellers

Advantages: •  Short main engine and reasonable propeller size •  Very high propulsion efficiency (10 % improvement vs. twin

screw depending on relation between main engine and thruster) => less installed power and low fuel costs

•  Propulsion redundancy •  Very good manoeuvrability •  Very high flexibility – propulsion and electrical power •  Reduced size of engine room / higher container capacity

Disadvantages: •  Probably higher installation costs than twin-propeller

solution •  No steering redundancy •  Needs careful considerations to avoid cavitation

Knud E. Hansen A/S


Means of Saving Fuel: •  Increasing the propeller efficiency

•  Recovering the waste gas heat •  Reducing the friction resistance of the

hull

Knud E. Hansen A/S


Means of Saving Fuel: •  Increasing the propeller efficiency

• PBCF – (Propeller Boss Cap Fin) –  Fuel saving up to approximately 4 %

• High-efficiency propellers e.g. with Kappel blades

–  Fuel saving up to approximately 4 %

Knud E. Hansen A/S


Means of Saving Fuel: •  Recovering the waste gas heat

– Fuel saving 7 - 12 % depending on sophistication of heat recovery plant

Knud E. Hansen A/S


Means of Saving Fuel: •  Reducing the hull resistance by air

lubrication – Air Cavity System (ACS)

Knud E. Hansen A/S

Flat Bottom with Air Cavity System

Knud E. Hansen A/S

12,670 TEU Container Ship with ACS

Modified Design with ACS

Knud E. Hansen A/S



Loa.: 400.0 m Lpp.: 378.0 m B: 54.2 m Depth: 30.5 m Draft: 14.5 m Speed: 26.0 kn Power: 2 x 57 MW

ACS area 6700 m2

ACS volume 10,000 m2

Knud E. Hansen A/S


ACS Air Supply System • Triple air compressors

• Common air feed pipe

• Redundant distribution system

Knud E. Hansen A/S

12,670 / 13,370 TEU Ship with ACS

Widened Ship with ACS

Present Ship:

Breadth: 54.20 m

Capacity: 12.670 TEU

Widened Ship:

Breadth: 56.70 m

Capacity: 12.670 + 700 = 13.370 TEU

Knud E. Hansen A/S

12,670 / 13,370 TEU Ship with ACS

Speed and Power • Fuel saving by ACS ~ 7.6 % ~ 28 t per day

• or speed increase ~ 0.6 knots

• or speed increase ~ 0.3 knots + 700 TEU

Knud E. Hansen A/S


Conclusion Installation of an Air Cavity System gives the choice between:

• Saving approx. 7.6 % in fuel consumption

corresponding to approx. 28 t per day or

•  Increasing the speed by 0.6 kn or

•  Increasing the speed by 0.3 kn + increasing the capacity by 700 TEU

Knud E. Hansen A/S


Single-engine single-propeller design

Loa.: 385.3 m Lpp.: 363.3 m B: 51.7 m Depth: 29.0 m Draft: 14.5 m Speed: 24.5 kn Power: 81 MW

Knud E. Hansen A/S



Loa.: 385.3 m Lpp.: 363.3 m B: 51.7 m Depth: 30.5 m Draft: 14.5 m Speed: 25.0 kn Power: 81 MW

ACS area 5200 m2

ACS volume 7,800 m2

Knud E. Hansen A/S


Speed and Power • Max. speed with largest available engine

(81 MW) without ACS system: 24.6 knots • Max. speed with ACS system: 25.1 knots

Knud E. Hansen A/S


Conclusion

By installing an Air Cavity System it is possible to design a single-engine single-propeller ship with a capacity of 11,000 TEU and a speed above 25 knots.

Engineering

UlCS with asc powerpoint rev.a DKGROUP