dme presentation

8/3/2019 Dme Presentation

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Assesment of the PerformanceAssesment of the PerformanceEvaluation of Diesel EnginesEvaluation of Diesel Engines

fueled with DME, DME/Dieselfueled with DME, DME/DieselBlend and Neat DieselBlend and Neat Diesel

Submitted to: Assoc. Prof. FikretSubmitted to: Assoc. Prof. FikretInal Submitted by: zge BulunazInal Submitted by: zge Bulunaz

150202040150202040


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OutlineOutline

I.Introduction

II.DME as a fuel for engines

III. DME mixing with Diesel Fuel

IV.Emissions of Engines Fueled with DME,DME/Diesel Blend and neat Diesel

V. Conclusions


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I.IntroductionI.Introduction

Why Dimethyl ether(DME)?

DME;

Advantages

+ high cetane number and oxygen content+short molecular chains

+volatile organic compound

+non-carcinogenic, non-teratogenic, non-

mutagenic and non-toxic+tropospheric lifetime of dimethyl ether to be 5.1

days, environmentally friendly


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Disadvantages;-Low viscosity of DME-Higher fuel volume

-Low boiling point -> injection rate,performance of engines


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Objective

Comparison Performance and emissioncharacteristics of engines fueled withDME,DME/diesel blends and neat Diesel fuel


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II.DME as a Fuel for EnginesII.DME as a Fuel for Engines

Modifications;

-DME under 0.5 Mpa to keep it liquidphase

-Pressure of fuel supply system 1.2 to 3.0MPa

-larger amount of fuel supply(i.e.same

engine power; fuel energy of 1kg dieselfuel= 1.49kg of DME )


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Effect of fuel delivery advance angle on the in-cylinder pressure and heatEffect of fuel delivery advance angle on the in-cylinder pressure and heat

release raterelease rate

Effect of Fuel Delivery AdvanceAngle


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III.DME Mixing with Diesel FuelIII.DME Mixing with Diesel Fuel

Solubility;

*No need to add solvent*10wt% DME- DM1015wt% DME- DM15

20wt% DME-DM20


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Effect of temperature change on the solubility of DME in diesel fuel


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Power Characteristics of DME/dieselPower Characteristics of DME/dieselblends in Enginesblends in Engines

Power Outputs of DME/diesel blends at various fractions


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The comparison of HRR among various fuelsThe comparison of HRR among various fuels

Heat Release Rate of Engines with Diesel Fuel

and DME/Diesel Blend Fuel


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IV.EMISSIONS OF ENGINES FUELED WITHIV.EMISSIONS OF ENGINES FUELED WITH

DME,DME/DIESEL BLEND AND DIESELDME,DME/DIESEL BLEND AND DIESEL

Visible Pollutions

-High oxygen content of blend reduces smoke density

-Boiling point has an influence on soot formation

-DME presents almost smoke-free combustion over the whole spe

range compared to neat diesel engine


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Smoke Emissions of engines fueledSmoke Emissions of engines fueled

with DME and neat Dieselwith DME and neat DieselSmoke emissions of engines Fueled wit

DME and neat Diesel


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Invisible PollutionsInvisible Pollutionsa.NOx Emissionsa.NOx Emissions

Comparison between NOx emissionsthe engines fueled with DME and neadiesel

Comparison of NOx emissions ofdifferent weight fractions of DME/diesel blends and neat Diesel Fuel


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b.HC Emsionsb.HC Emsions

jHC emissions of engine fueled withDiesel and DME

HC emissions of various fractionedblends and neat diesel


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c. CO Emissionsc. CO Emissions

CO emissions of enginesfueled with neat diesel and

DME/diesel blend

CO emission of diesel enginesfueled with DME and diesel


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d. COd. CO22 EmissionsEmissions

CO2 emissions of engines fueled

with neat diesel and DME/dieselblend

CO2 emissions of engines

fueled with DME and diesel


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V. ConclusionsV. Conclusions

Fuel delivery advance anglepeak in-cylinder pressure, peak

HRR, peak PRR, and peak mean gastemperaturethe more DME fraction lets the

more HRRSmoke, HC, CO, CO2and NOx

emissions

dme presentation

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