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4 study of_small_scale_lng_carrier
This document summarizes a study on designing a small-scale LNG carrier and bunkering ship with a dual-fuel engine. The study involved multiple Japanese shipbuilding and engineering companies. The target was to increase natural gas use by developing an LNG bunkering ship and coastal LNG carriers. The selected design used a dual-fuel engine, electrical propulsion system, 3,500 cubic meter LNG cargo tanks, a 38 cubic meter LNG fuel tank, and an LNG fuel supply system to provide fuel from the cargo tanks. The presentation concludes by thanking ClassNK for supporting the joint industry research program.
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4 study of_small_scale_lng_carrier
- 1. Study of SmallScale LNG Carrier /Bunkering Ship with DF Engine July 2014 Principal Design Project of Small Scale LNG Carrier/bunkering ship with DF Engine, CAJS Presented by Mr. Kei Tanaka, CEng. CMarEng. FIMarEST Project Manager ( General Manager, Daihatsu Diesel Mfg. Co., Ltd. )
- 2. 1. Member ofStudy Principal Design Project of Small Scale LNG Carrier / Bunkering Ship with DF Engine Project Member The Cooperative Association of Japan Shipbuilders Association Kobe Senpaku Kaisha Shipping Higaki Shipbuilding Co., Ltd. 桧垣造船股份有限公司 Shipbuilding Sanwa Dock Co., Ltd. Shipbuilding Izumi Steel Works, Ltd. Tank Plant Daihatsu Diesel Mfg. Co., Ltd. 大发柴油机株式会社 Engine ClassNK Class Project Leader : Mr. Haruhisa Nagai, Kobe Senpaku Kaisha Project Manager : Mr. Kei Tanaka
- 3. 2.1 Target ofStudy Background NOx SOx GHG Environmental Issue Natural Gas Trans- port Oil Price Economical Issue GAS Fuelled Ship Gas Fuelled Ship Coastal LNG Carrier LNG Bunkering Ship Target Increase of the natural gas use
- 4. 2.1 Target ofStudy Gas Fuelled Ships About 50 LNG Supply Infrastructure LNG Bunkering Ship Only 1 LNG User LNG Carrier / Bunkering Ship
- 5. 2.2 Study Process Typeof Ship : LNG Carrier /Bunkering Ship Operation Route : Tokyo Bay – Hokkaido for LNG Transport Speed : 13.0kt Main Engine for Alternator : Natural Gas Use Cargo Tank : IMO Type C Independent Tank Capacity : 3,500m3 Base Plan Gas fuelled Electrical Propulsion Requirement of LNG Bunkering Japanese Coastal LNG Carrier
- 6. 3.1 Selection ofEngine Select Dual Fuel Engine Lean Burn (at Gas Mode) Lean Burn IMO MARPOL Annex VI NOx : Tier III Regulation (Required in ECA) Without SCR Equipment SOx : No Sulfur Content Gas & Marine Diesel Oil Select the Cheaper Fuel MDO can be use in Emergency (Long Term Storage) Gas only Dual Fuel Gas Fuel only One LNG Fuel Tank Two LNG Fuel Tanks
- 7. 3.2 Selection ofPropulsion System Electrical Propulsion System Electrical Motor Alternator MSB Starter Ｇ Engine Reduction Gear CPP M M Ｇ No. of Propeller : 2 Given by Propulsion Efficiency & Redundant propulsion FPP Fixed Pitched Propeller with Inverter CPP Controllable Pitched Propeller High Cost Maneuverability Good for Low Speed Operation Select CPP System
- 8. 3.3 Performance Hull DesignModel Hull Form Twin-Skeg Normal Rating at 13.0kt BHP : 1,695kWe Performance Curve Maximum Continuous Rating BHP : 1,995kWe
- 9. 3.4 Electrical PowerSupply Demand MCR Condition NOR Condition Departure & Arrival Condition Port Condition Cargo Loading Cargo Unloading Propulsion Power (kW) 1,781 1,514 534 0 0 0 Electrical Power for Propulsion (KW) 1,995 1,695 599 0 0 0 Electrical Power for Ship Equipment (kW) 235 235 735 160 315 514 Total Electrical Power (kW) 2,230 1,930 1,334 160 315 514 No. of Alternator 4 3 3 1 1 1 Power Factor 74% 85% 59% 21% 42% 68% Alternator Output >757kW Electrical Power for Propulsion MCR : 1,995kW NOR : 1,665kW Electrical Power for Ship Equipment Voyage : 235kW D & A Condition : 735kW Operation Engine Number 3 Engines 85% Load 1 Engine Stand-by
- 10. 3.5 Study ofLNG Fuel Supply System Case 1 Case 2 Case 3 Natural Gas is supplied by LNG Cargo Tank LNG Fuel Tank LNG Fuel Tank LNG Fuel Tank No Yes Yes Re-liquefaction Plant No No Yes (For BOG of LNG Cargo Tank) Gas Compressor Yes Yes Small Scale (For BOG of LNG Cargo Tank) No Vaporizer Main Main & PBU Main & PBU Result Steady supply of the LNG fuel is difficult. Steady supply of the LNG fuel is easy. Minimum Size. System is Complicated & Expensive. LNG Fuel is supplied From LNG Cargo Tank to LNG Fuel Tank No re-liquefaction plant Boil off gas of LNG Cargo Tank is used as Fuel
- 11. 3.6 Diagram ofLNG Fuel Supply System
- 12. 3.7 Arrangement ofLNG Fuel Supply System Tank Connection Space LNG Fuel Tank Dual Fuel Engine Gas Supply Unit LNG Fuel Compressor Room LNG Fuel Supply Boil off gas Engine Room The mechanical ventilation capacity is at least 30 air changes per hour. Independent access direct from the open deck. LNG Cargo Tank Gas safe machinery space. The two-barrier concept. Vaporizer Compressor gas LNG
- 13. 3.８ Requirement forBunkering Vessel ERC Bunkering Ship Gas-fuelled Ship Drip Tray Drip Tray LNG Transfer Hose Fender Hoseguide Water Curtain Hardware Freeboard height difference between both ships. Treatment of Boil-Off-Gas of Gas fuelled ship. Mooring of ships. Software The bunkering procedure. The urgent detached mooring Risk assessment. Seafarers training, qualification. LNG transportation regime. The marine disaster prevention system. Image of LNG Bunkering Detail of bunkering systems should be decided according to the details of the gas-fuelled ship.
- 14. 4.1 Main Particular MainParticular Type LNG Carrier / Bunkering Ship Gross Tonnage Ab 5,200ton Loa 107.80 m Lpp 101.40 m B 17.20 m D 7.80 m d Ab 4.60m DW Ab 2,650 ton Speed 13.0 knots (85%NOR) Cargo Tank Volume 3,500 m3 General Arrangement
- 15. 4.2 Machinery Systems LNG MarineDiesel Oil Alternator Main Switch Board Propulsion Motor & Reduction Gear CPP Gas Supplied Unit Machinery Systems Propulsion System Electrical Propulsion System Main Generator Engine Dual Fuel Engine Output：796 kwm x 900min-1 x 4sets Alternator 3φAC 440V Brushless Alternator Output：757kwe x 8P x 900min-1 60Hz x 4sets Propulsion Motor 3φAC 450V Induction Motor Output：950kw x 6P x 1200min-1 60Hz x 2sets Reduction Gear 2 sets Propeller Controllable Pitched Propeller x 2 sets
- 16. 4.3 LNG FuelSupply Equipment LNG Fuel Tank Type Cylindrical with Both Ellipsoidal Heads IMO Type C Independent Tank Type of Thermal Insulation Vacuum Perlite Insulation Capacity 38 m3 No. 1 set Design Vapor Pressure 10 bar g Minimum LNG Operating Temperature -163℃ Materials Inner Vessel SUS304, Outer Vessel SUS304 LNG Fuel Supply System Design Gas Supply Volume Ab 500Nm3/h （MCR） Design Gas Supply Pressure 5.5 ～ 6.5 bar g Design Gas Supply Temperature 5 ～ 40℃ Pressure Build-up Vaporizer 50kg/h LNG Vaporizer 500kg/h
- 17. 4.4 LNG CargoTank & Cargo Handling System LNG Cargo Tank Type Cylindrical with Both Hemi-spherical Heads IMO Type C Independent Tank Type of Thermal Insulation External Wall Insulation Made of Rigid Polyurethane Foam Capacity Ab 3,500m3 No. 2 sets（1,750m3 x 2 sets） Design Vapour Pressure 7.0 bar g Minimum Design Temperature -163 ℃ Materials Nickel Steel LNG Cargo Handling System Loading Time (Design) Ab 3 Hours (1,200m3/h) Unloading Time (Design) Ab 3 Hours (1,200m3/h) Type of Cargo Pump Electric Motor Driven Submerged Pumps 300m3/h x 120mLC x 4 sets Other Equipment Cargo Compressor, Gas Heater, LNG Vaporizer, etc.
- 18. 5.1 Aspect ofVessel
- 19. 5.2 Central Area HoseHandling Crane Cargo Handling Manifold Hose Guide
- 20. 5.3 See-through Model LNG CargoTank LNG Fuel Tank Dual Fuel Engine Propulsion Motor & Reduction Gear Fuel Gas Supply Unit LNG Fuel Supply System
- 21. LNG Fuel Tank Space ToLNG Fuel Compressor Room To Tank Connection Space To LNG Fuel Tank Hold Space Tank Connection Space LNG Fuel Compressor Room MDO Tank (P/S) 5.4 LNG Fuel Supply System
- 22. LNG Vaporizer Gas CompressorGas Heater/Cooler LNG Fuel TankTank Connection Space 5.5 LNG Fuel Supply System
- 23. 5.6 Stern Area Propulsion Motor Reduction Gear CPP Propeller Rudder& Steering Gear MSBElectrical Switch Board for Cargo Dual Fuel Engines Gas Supply Unit
- 24.
- 25. - END - Thisproject was carried out with the support of ClassNK as part of the ClassNK Joint R&D for Industry Program. Thanks for your Attention!