Possible Change of Ship Design Including Engine Room about - PDF document

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

Location of Mitsui Recently Extended Factory Mitsui Okayama Pref., Tamano City Index - NOx Reduction Methods 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

NOx Reduction Methods - 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 NOx Reduction Methods - Use of Water Experience Low Load Water Source Water Emulsion Some cases for Water separation at Fresh water land use engine stop Water Injection --- Fresh water SAM --- Reduced effect at Sea water lower scavenging air temperature EGR --- Sea water? 3

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

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

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

NOx Reduction Methods Test Application on 4T50ME-X Line for simple EGR SW Spray WMC FW Spray Exhaust WMC SW gas Spray SW scrubber Diesel engine WMC Spray FW EGR blower WMC Non return valve Auxiliary blower Cooler No. 1 + No. 2 WMC Line for simple EGR NOx Reduction Methods - 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

SOx Reduction Methods - Low Sulphur Fuel 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 Hot exhaust gas in Freshwater Supply pump Seawater Exhaust gas out Cooling water Recirculating pump Clean brine Sludge Scrubber tank EcoSilencer Waste pump Sludge out Water supply / Cooling water / Water brine Circulating water Sludge 8

PM Reduction Methods - Improvement of Fuel Injection Slide type Fuel Valve Higher injection ME engine or Common Rail pressure at low load - Reduction of Cylinder Oil Dosage Production at Mitsui Alpha Lubricator Retrofit 164 engines 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

CO 2 Reduction Methods Turbocharger Efficiency NA Turbocharger TCA Turbocharger 0. 80 0. 75 Excess Energy to be utilized 0. 70 Efficiency 0. 65 Higher Exhaust Line 1 Line 2 Gas Temp. 0. 60 0. 55 0. 50 1. 0 2. 0 3. 0 4. 0 5. 0 Pressure Ratio CO 2 Reduction Methods Heat Balance Efficiency Improve Turbo-Generator + TCS Conventional TES 10

CO 2 Reduction Methods Turbo Compound System Generator, AC alternator Reduction gear with over Steam turbine speed clutch Reduction gearbox Exh. Gas turbine Approx. dimensions refering to a 12K98ME/MC: Length: 10 meters Breadth; 3.5 meters Weight: 58 tons CO 2 Reduction Methods Power Turbines with Expected max. Output PT based on NR PTG18 - 355 kW PTG23 - 590 kW PTG26 - 1,120 kW PT based on TCR PT12 - 250 kW PT14 - 350 kW PT16 - 500 kW PT18 - 700 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

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