Effects of Injection Timing on Combustion and Emission Performance of Dual-Fuel Diesel Engine under Low to Medium Load Conditions
Abstract
:1. Introduction
2. Design of Experiments
2.1. Dual-Fuel Supply System
2.2. Test System
2.3. Test Procedure
3. Analysis of Test Results
3.1. Power Performance
3.2. Brake Specific Energy Consumption
3.3. Pollutant Emissions
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Engine Specifications | Value |
---|---|
Rated power (kW) | 25.7 |
Rated speed (r·min−1) | 2400 |
Compression ratio | 17 |
Displacement (L) | 2.224 |
Bore × Stroke (mm) | 110 × 117 |
Connecting rod length (mm) | 185 |
Inlet valve opening/closing (°CA) | 12 BTDC/44 ABDC |
Exhaust valve opening/closing (°CA) | 52 BBDC/12 ATDC |
Layout & cylinders | Line 2 |
Combustion chamber type | Direct injection ω type |
Type of timing | SEFI |
Injection interval | 180 °CA |
Injection pressure (MPa) | 23~24 |
Item | Specification | Precision |
---|---|---|
Dynamometer | Torque N·m | ±0.4% F.s |
Rotation Speed rpm | 0.1% ± 1 | |
Diesel flowmeter | Fuel mass flow kg/h | ±0.12% |
Air flowmeter | Fuel mass flow kg/h | ±0.5% |
Natural gas flowmeter | Volumetric flow rate SLPM | ±0.8% |
Pressure sensor | In-cylinder pressure bar | ≤±0.5 bar |
Exhaust gas analyzer | Volume percent of CO ppm | 10 ppm |
Volume percent of CO2 ppm | ±0.4% | |
Volume percent of HC ppm | ±10 ppm | |
Volume percent of NO ppm | ±12 ppm | |
Volume percent of NO2 ppm | ±5 ppm | |
Smoke meter | Smoke opacity % | ±0.1 |
Experiment Case | md1 (Mg/Cylinder Cycle) | R % | md2 (Mg/Cylinder Cycle) | ϕa | mair (Mg/Cylinder Cycle) | mNG (Mg/Cylinder Cycle) | Injection Timing (°CA BTDC) |
---|---|---|---|---|---|---|---|
1600 r/min (4.54 kW) | 19.69 | 40 | 11.81 | 3.25 | 933.58 | 6.80 | 15, 17, 19, 21, 23, 25, 27 |
60 | 7.88 | 936.80 | 10.09 | ||||
1600 r/min (8.48 kW) | 31.04 | 60 | 12.42 | 2.26 | 1027.13 | 15.92 | |
80 | 6.21 | 1030.67 | 21.11 |
Item | Unit | Diesel | Natural Gas |
---|---|---|---|
Chemical formula | CnHm | CH4 | |
Component quality | gC/kg | 0.847 | 0.750 |
gH/kg | 0.126 | 0.250 | |
Molecular mass | 180~200 | 16 | |
Stoichiometric | 14.3 | 17.4 | |
Lower heat value | MJ/kg | 42.5 | 50.5 |
Heat value at ϕa = 1 | kJ/m3 | 3750 | 3230 |
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Zhou, H.; Zhao, H.-W.; Huang, Y.-P.; Wei, J.-H.; Peng, Y.-H. Effects of Injection Timing on Combustion and Emission Performance of Dual-Fuel Diesel Engine under Low to Medium Load Conditions. Energies 2019, 12, 2349. https://doi.org/10.3390/en12122349
Zhou H, Zhao H-W, Huang Y-P, Wei J-H, Peng Y-H. Effects of Injection Timing on Combustion and Emission Performance of Dual-Fuel Diesel Engine under Low to Medium Load Conditions. Energies. 2019; 12(12):2349. https://doi.org/10.3390/en12122349
Chicago/Turabian StyleZhou, Hua, Hong-Wei Zhao, Yu-Peng Huang, Jian-Hui Wei, and Yu-Hui Peng. 2019. "Effects of Injection Timing on Combustion and Emission Performance of Dual-Fuel Diesel Engine under Low to Medium Load Conditions" Energies 12, no. 12: 2349. https://doi.org/10.3390/en12122349