possible change of ship design including engine room about

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

Masaki OhtsuMitsui Engineering & Shipbuilding Co., Ltd.

February 28, 2007

Introduction of Mitsui

- 3rd 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.

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MitsuiOkayama Pref., Tamano City

Location of Mitsui

Recently Extended Factory

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

- CO2 Reduction

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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

Sea water?---EGR

Sea waterReduced effect at lower scavenging air temperature

---SAM

Fresh water---Water Injection

Fresh waterWater separation at engine stop

Some cases for land use

Water Emulsion

Water SourceLow LoadExperience

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Fuel System with Water Emulsion



SW mist catcher

Box for FW1stage

Air Cooler with Water Mist Catcher

Sea Water Inlet

Sea Water Outlet

FW Stage2 Outlet

FW Stage2 Inlet

Turbocharger

FW Stage1 InletFW Stage1 Outlet

SAM = Scavenging Air Moisturing

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Sea Water Stage

NOx Reduction Methods

Air flow straightener

Twin pass water separation stage

Twin pass water separation stage

SW spray line and nozzle

Return from intermediate FW system

Filter

Alarm

Floatation type water outlet valve

SW inlet

SW return buffer tank

SW spray pumps

SW valves Dump

p

p

1

P P

P

P

Fresh Water 1 Stage


Single pass water Spray separators


Intermediate FW holding tank

Spray pumps

Surplus dump valve

To SW pumps

Return from clean FW systemIntermediate FW spray nozzles

Filter

Dump

Alarm

p

NaClp

t

P P

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Fresh Water 2 Stage


Clean FW spray line and nozzles

Surplus FW dump valve

To intermediate FW pumps

Clean FW holding tankFW

pumps


Modified standard water mist separation system

Air coolerFilter Alarm

Dumpp

p

t

NaCl

Simple EGRHot exhaustgas inlet

Freshwaterinjectors

Cold exhaustgas outlet

Freshwaterdrain

2nd stageFlow change cyclonewater separator

1st stageFlow change cyclonewater separator

Seawaterdrain

Seawaterinjector


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Test Application on 4T50ME-X

Diesel engine

Line for simple EGR

Line for simple EGR

Exhaustgasscrubber

Non return valve

WMC

WMC

Spray

Spray SW

FWWMC

WMC

SW

FWWMC

Spray

Spray

EGRblower

Auxiliaryblower

CoolerNo. 1 +No. 2

SW


NOx Reduction Methods- SCR

Big Installation Work

Reactor before T/C

High sulphur no good

Supply of NH3 or Urea

Dynamic Response ?

Low load performance ?

Example of actual installation for S35MC

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- 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

Freshwater

Seawater

Cooling water

Clean brine

Sludge outWastepump

Sludgetank

Recirculating pump

Supply pump

Water supply / Cooling water / Water brineCirculating waterSludge

ScrubberEcoSilencer

Hot exhaustgas in

Exhaustgas out

- Scrubber

SOx Reduction Methods

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- Improvement of Fuel Injection

Slide type Fuel Valve

ME engine or Common Rail

- Reduction of Cylinder Oil Dosage

Alpha Lubricator

PM Reduction Methods

Higher injection pressure at low load

Retrofit 164 engines

Production at Mitsui

- Turbo Generator

Higher Exhaust Gas Temp. (TES)

- TCS

Utilization of Higher Turbocharger Efficiency

CO2 Reduction Methods

About 5% more

About 3～4% more

Efficiency of Diesel Engine is already very high

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Turbocharger Efficiency

0 . 50

0 . 55

0 . 60

0 . 65

0 . 70

0 . 75

0 . 80

1 . 0 2 . 0 3 . 0 4 . 0 5 . 0

Pressu re Rat io

Eff

icie

ncy

L in e 1

Line 2

TCA Tu rbocharge rNA　Tu rbocharge r


Higher Exhaust Gas Temp.

Excess Energy to be utilized

Heat Balance

TESConventional

Turbo-Generator + TCS

Efficiency ImproveCO2 Reduction Methods

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Turbo Compound System


Exh. Gas turbine

Reduction gear with over speed clutch Steam turbine

Reduction gearbox

Generator, AC alternator

Approx. dimensions refering to a 12K98ME/MC: Length: 10 meters Breadth; 3.5 meters Weight: 58 tons

Power Turbines with Expected max. Output

PTG18 - 355 kWPT based on NR

PTG26 - 1,120 kW

PT16 - 500 kWPT18 - 700 kWPT20 - 1,000 kWPT22 - 1,800 kW

PT44 - 2,300 kWPT55 - 3,200 kWPT66 - 4,500 kW

PT14 - 350 kWPT12 - 250 kW

PTG23 - 590 kW

PT based on TCR

PT based on TCA


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Simple Turbo Compound SystemAlternator asynchronous type Planetary Gear

Power Turbine


possible change of ship design including engine room about

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