Possible Change of Ship Design Including Engine Room about Emissions of NOx and SOx

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1 Possible Change of Ship Design Including Engine Room about Emissions of NOx and SOx Masaki Ohtsu Mitsui Engineering & Shipbuilding Co., Ltd. February 28, 2007 Introduction of Mitsui -3 rd position in production of low speed diesel Hyundai 7.7 million bhp Doosan 6.3 million bhp (2006) Mitsui 3.8 million bhp - 80 years history of B&W low speed engines - Low profile in medium speed diesel - Factory located in Tamano, Okayama-pref. 1

2 Location of Mitsui Recently Extended Factory Mitsui Okayama Pref., Tamano City Index - Fuel Injection Timing/Atomizer Choice Electronically Controlled Injection Use of Water / EGR SCR - SOx Reduction Methods Low sulphur fuel Scrubber - PM Reduction -CO 2 Reduction 2

3 - Fuel Injection Timing / Atomizer Choice ME engine can control injection pattern/timing Immediate mode change is possible Slide type Fuel Valve 12K98ME Conventional FV Slide Valve - Use of Water Experience Low Load Water Source Water Emulsion Some cases for land use Water separation at engine stop Fresh water Water Injection --- Fresh water SAM EGR Reduced effect at lower scavenging air temperature Sea water Sea water? 3

4 - Use of Water Fuel System with Water Emulsion - Use of Water SAM = Scavenging Air Moisturing Turbocharger Sea Water Inlet SW mist catcher Box for FW1stage Air Cooler with Water Mist Catcher Sea Water Outlet FW Stage1 Inlet FW Stage1 Outlet FW Stage2 Inlet FW Stage2 Outlet 4

5 Sea Water Stage Air flow straightener SW spray line and nozzle Filter p p 1 Return from intermediate FW system Alarm Twin pass water separation stage P P SW spray pumps Floatation type water outlet valve SW inlet SW valves Dump SW return buffer tank P P Twin pass water separation stage Fresh Water 1 Stage Intermediate FW spray nozzles Return from clean FW system p t Dump Filter p Alarm To SW pumps Surplus dump valve NaCl P P Single pass water Spray separators Spray pumps Floatation type water outlet valve Intermediate FW holding tank 5

6 Fresh Water 2 Stage Clean FW spray line and nozzles Surplus FW dump valve p t Dump To intermediate FW pumps Air cooler Filter p Alarm NaCl FW pumps Clean FW holding tank Modified standard water mist separation system Floatation type water outlet valve Simple EGR Hot exhaust gas inlet Seawater injector Seawater drain 1st stage Flow change cyclone water separator 2nd stage Flow change cyclone water separator Freshwater drain Freshwater injectors Cold exhaust gas outlet 6

7 Test Application on 4T50ME-X Line for simple EGR SW Spray WMC FW Spray Diesel engine Spray WMC Spray WMC SW FW Exhaust gas scrubber SW WMC EGR blower Auxiliary blower Non return valve WMC Cooler No. 1 + No. 2 Line for simple EGR -SCR Big Installation Work Reactor before T/C High sulphur no good Supply of NH 3 or Urea Dynamic Response? Low load performance? Example of actual installation for S35MC 7

8 - Low Sulphur Fuel SOx Reduction Methods SOx Emission Control Area (SECA) has been started High/Low sulphur fuel tanks to be provided. Careful change over is necessary. Corresponding change of cylinder oil maybe necessary SOx Reduction Methods - Scrubber Freshwater Seawater Supply pump Hot exhaust gas in Exhaust gas out Cooling water Clean brine Recirculating pump Sludge out Waste pump Sludge tank Scrubber EcoSilencer Water supply / Cooling water / Water brine Circulating water Sludge 8

9 PM Reduction Methods - Improvement of Fuel Injection Slide type Fuel Valve ME engine or Common Rail - Reduction of Cylinder Oil Dosage Alpha Lubricator Retrofit 164 engines Higher injection pressure at low load Production at Mitsui CO 2 Reduction Methods - Turbo Generator Higher Exhaust Gas Temp. (TES) About 5% more -TCS Utilization of Higher Turbocharger Efficiency About 3~4% more Efficiency of Diesel Engine is already very high 9

10 CO 2 Reduction Methods Turbocharger Efficiency NA Turbocharger TCA Turbocharger 0.80 Efficiency Line 1 Line 2 Excess Energy to be utilized Higher Exhaust Gas Temp Pressure Ratio Heat Balance CO 2 Reduction Methods Efficiency Improve Turbo-Generator + TCS Conventional TES 10

11 CO 2 Reduction Methods Turbo Compound System Reduction gear with over speed clutch Steam turbine Reduction gearbox Generator, AC alternator Exh. Gas turbine Approx. dimensions refering to a 12K98ME/MC: 10 meters Breadth; 3.5 meters Weight: 58 tons Length: CO 2 Reduction Methods Power Turbines with Expected max. Output PT based on NR PTG kw PTG kw PTG26-1,120 kw PT based on TCR PT kw PT kw PT kw PT kw PT20-1,000 kw PT22-1,800 kw PT based on TCA PT44-2,300 kw PT55-3,200 kw PT66-4,500 kw 11

12 CO 2 Reduction Methods Simple Turbo Compound System Alternator Planetary Gear asynchronous type Power Turbine 12