Abstract
In this study, the effects of hydrogen addition on diesel-biodiesel-butanol fuel blends were investigated in terms of engine performance, combustion, and emission characteristics under different engine operating conditions. The experiments were performed with eight different fuel blends at a constant engine speed of 2000 rpm, which is the maximum torque value of all test fuels. The four operating conditions were at 25%, 50%, 75%, and 100% engine loads. Hydrogen was delivered to diesel-biodiesel-butanol fuel blends through the intake manifold with different rates of fuel mass consumption. The experiment results were compared with euro diesel and absence of hydrogen addition for all test fuels. The experimental results have revealed that at 2000 rpm engine speed, the brake torque, in-cylinder pressure, and exhaust gas temperature increased with the addition of hydrogen. Nevertheless, the brake-specific fuel consumption, carbon monoxide (CO), carbon dioxide (CO2), hydrocarbon (HC), nitrogen oxides (NOx), and smoke opacity emissions decreased under various engine conditions. The heat release rate was generally shown to be decreased with higher engine loads and increased with lower engine load conditions, while a rise in thermal efficiency was observed. Therefore, the addition of hydrogen in a diesel engine usually exhibited fewer emissions, improved the combustion process, and increased the brake torques of the engine by comparison to the absence of hydrogen addition.
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Abbreviations
- ABDC:
-
After bottom dead center
- EVO:
-
Exhaust valve open
- ATDC:
-
After top dead center
- HC:
-
Hydrocarbon
- be :
-
Effective brake-specific fuel consumption (g/kWh)
- HRRmax :
-
Maximum heat release rate
- Be :
-
Effective fuel consumption (g/h)
- ID:
-
Ignition delay
- BBDC:
-
Before bottom dead center
- IT:
-
Injection time
- BP:
-
Brake power (kW)
- IVC:
-
Intake valve closed
- BSFC:
-
Brake-specific fuel consumption
- IVO:
-
Intake valve open
- BTDC:
-
Before top dead center
- LHV:
-
Lower heating value
- B20:
-
20% biodiesel plus 80% euro diesel (volumetric)
- Me:
-
Effective engine torque (Nm)
- B20But5:
-
20% biodiesel plus 75% euro diesel plus 5% butanol (volumetric)
- n:
-
Engine speed (rpm)
- B20But5 + H2 :
-
20% biodiesel plus 75% euro diesel plus 5% butanol (volumetric) + hydrogen
- NaOH:
-
Sodium hydroxide
- B20But10:
-
20% biodiesel plus 70% euro diesel plus 10% butanol (volumetric)
- NO:
-
Nitrogen monoxide
- B20But10 + H2 :
-
20% biodiesel plus 70% euro diesel plus 10% butanol (volumetric) + hydrogen
- NOx :
-
Nitrogen oxides
- BTE:
-
Brake thermal efficiency
- P:
-
Cylinder pressure (bar)
- CD:
-
Combustion duration
- Pe:
-
Effective brake power (kW)
- CFPP:
-
Cold filter plugging point
- PM:
-
Particulate matter
- CI:
-
Compression ignition
- ppm:
-
Parts per million
- CN:
-
Cetane number
- rpm:
-
Revolution per minute
- CO:
-
Carbon monoxide
- Qnet :
-
Heat value (J)
- CO2 :
-
Carbon dioxide
- SOC:
-
Start of combustion
- CPmax :
-
Maximum cylinder pressure
- TDC:
-
Top dead center
- D:
-
Diesel
- THC:
-
Total hydrocarbons
- DI:
-
Direct injection
- Tex:
-
Exhaust gas temperature
- D100:
-
100% euro diesel
- WCOME:
-
Waste cooking oil methyl ester
- D100 + H2 :
-
100% euro diesel+hydrogen
- V:
-
Cylinder volume (m3)
- EGT:
-
Exhaust gas temperature
- θ:
-
Represents crank angle (oCA)
- EOC:
-
End of combustion
- γ:
-
Specific heat the ratio
- EVC:
-
Exhaust valve closed
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Acknowledgments
The authors would like to acknowledge Erciyes University and Bayburt University, for the Scientific Research Projects Unit of Erciyes University, Turkey and for the financial support under the grant number FOA-2015-5817 and FBA-2017-7704.
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Sarıkoç, S., Ünalan, S. & Örs, İ. Experimental Study of Hydrogen Addition on Waste Cooking Oil Biodiesel-Diesel-Butanol Fuel Blends in a DI Diesel Engine. Bioenerg. Res. 12, 443–456 (2019). https://doi.org/10.1007/s12155-019-09980-x
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DOI: https://doi.org/10.1007/s12155-019-09980-x