2.4 INVESTIGATION_AN_ENVIRONMENT_FRIENDLY_PROPULSION_SYSTEM_FOR_LNGC_Rev[1].pdf

8/14/2019 2.4 INVESTIGATION_AN_ENVIRONMENT_FRIENDLY_PROPULSION_SYSTEM_FOR_LNGC_Rev[1].pdf

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PROPULSION SYSTEM FOR LNG CARRIERPROPULSION SYSTEM FOR LNG CARRIER

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by L.M. Yan & J.J. Huangby L.M. Yan & J.J. Huang

MARINE DESIGN & RESEARCH INSTITUTE OF CHINAMARINE DESIGN & RESEARCH INSTITUTE OF CHINA


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ContentContent

11.. GeneralGeneral IntroductionIntroduction

22.. FeaturesFeatures ofof DifferentDifferent PropulsionPropulsion SystemsSystems

.. ..

55.. OtherOther IssuesIssues forfor ConsiderationConsideration

66.. ConclusionConclusion


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1. Introduction1. Introduction

WhatWhat isis naturalnatural gas?gas?

WhatWhat isis LNGC?LNGC?

WhatWhat isis anan environmentenvironment friendlyfriendly propulsionpropulsion system?system?

SteamSteam turbineturbine propulsionpropulsion systemsystem

LSRLLSRL

DFDEDFDE


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2. Feature of Different Propulsion System

SteamSteam boilerboiler withwith dualdual fuelfuel burnerburner

BurningBurning combinationcombination ofof gasgas andand fuelfuel

oiloil


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--

plusplus rere--liquefactionliquefaction plantplant

ExtensivelyExtensively usedused forfor conventionalconventional cargocargo shipship

--


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systemsystem (DFDE)(DFDE)

BurningBurning withwith 9999%% ofof gasgas andand 11%% ofof

pilotpilot oiloil

~~ cy n erscy n ers or or powerpower s a ons a on


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3. Relationship between PP and BOG

The largest feature of LNGC is the issue ofThe largest feature of LNGC is the issue of

as appene a ways. n oras appene a ways. n orenvironment protection, BOG shall beenvironment protection, BOG shall be

by GCU directly or other means of energyby GCU directly or other means of energy

wasting.wasting.


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Relationship between engine power and

cargo volume


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Power balance of different size of LNGC

It is clearly, a certain balance point is existed forIt is clearly, a certain balance point is existed for

different Class and cargo volume of LNGC wheredifferent Class and cargo volume of LNGC wherepower are produced by BOG and no more other fuel ispower are produced by BOG and no more other fuel is

needed and eventually none excess BOG is needed toneeded and eventually none excess BOG is needed to

. .


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4. Emission calculation of air pollution

TheThe amountamount ofof airair pollutionpollutionEmission of different system

120.00%

environmentenvironment friendlyfriendly oror notnot.. TakeTake aa

standardstandard sizesize of of 150150,,000000mm LNGLNG80.00%

100.00%

carriercarrier forfor example,example, onon thethe basisbasis ofof

applyingapplying threethree differentdifferent propulsionpropulsion

system,system, COCO22 NOxNOx andand SOxSOx 40.00%

60.00%

CO2

NOx

SOx

emissionemission isis toto bebe calculatedcalculated

separatelyseparately for for environmentalenvironmental

0.00%

20.00%

ana ys sana ys s.. 1 2 3

1- Steam turbine propulsion system

2- Low-speed diesel engine propulsion system + RL

3- Dual-fuel engine propulsion system


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4. 1 Emission for steam turbine propulsion system

~~

EquivalentEquivalent SFOCSFOC isis 294294g/kWg/kW..hh

COCO22 isis highesthighest

xx ss m norm nor ww gasgas mo emo e


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-.

plus Re-liquefaction plant

PowerPower efficiencyefficiency isis 4848%%..

--

NOxNOx isis 1414..44g/kWhg/kWh forfor mainmain engineengine

NOxNOx isis 99..77g/kWhg/kWh forfor auxiliaryauxiliary engineengine

SulphurSulphur contentcontent isis 33..55%% m/mm/m


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4. 3 Dual fuel diesel electric propulsion system (DFDE)

PowerPower efficiencyefficiency isis aboutabout 4343..44%%

NOxNOx isis11..44 g/kWhg/kWh (below(below TierTier III)III)..

SOxSOx isis minorminor withwith gasgas modemode


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5. Other issues for consideration

EnvironmentEnvironment--friendlyfriendly propulsionpropulsion systemsystem notnot

considerconsider otherother factorsfactors::

ShipShipss speedspeed

BalanceBalance ofof BOGBOG andand propulsionpropulsion powerpower


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6. Conclusion

NewNew regulationsregulations forfor thethe PreventionPrevention ofof Air Air

..

AA propulsionpropulsion systemsystem burningburning withwith cleanclean energyenergy

(natural(natural gas)gas) isis preferredpreferred..

maxmax ..


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Thank you!Thank you!

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2.4 INVESTIGATION_AN_ENVIRONMENT_FRIENDLY_PROPULSION_SYSTEM_FOR_LNGC_Rev[1].pdf