Hydrogen is generally acknowledged to have a high heat value and emit few pollutants. It has been identified as the fuel with the most potential for the twenty-first century. This study investigates energy saving and pollutant reduction for polycyclic aromatic hydrocarbons (PAHs), hydrocarbons (HCs), carbon monoxide (CO), carbon dioxide (CO2), particulate matter (PM), and nitrogen oxides and a hydrogen (H2) and oxygen (O2) mixture (H2/O2) mixed in a diesel engine combustion chamber. Experimental parameters included a speed of 1600 rpm and a torque of 145 Nm in the steady-state condition. These operating conditions represent a speed of 40km/hr, roughly vehicle speed in an urban area. In this study, premium diesel fuel (PDF) was mixed with H2/O2 at different injection rates. When mixed with PDF, the H2/O2 injection rate was set to 60L/min, while different biodiesel injection rates were used in the diesel engine combustion chamber. In addition, this study used mathematical simulation to model the combustion temperature, combustion efficiency, and combustion gas distribution in the combustion chamber.
The results of PDF mixed under different H2/O2 injection rates showed that the brake thermal efficiency (BTE) did not significantly change when the H2/O2 injection rate rose from 0 L/min to 40L/min, but markedly increased when the H2/O2 injection rate increased from 50 L/min to 70L/min. The best BTE of the diesel engine was 35.4% at an H2/O2 injection rate of 60 L/min, roughly 12.6% higher than PDF. The brake specific fuel consumption (BSFC) was 16.287 g/bhp-hr at an H2/O2 injection rate of 60 L/min, 11.72% lower than PDF. The results of the BTE and BSFC showed that an H2/O2 injection rate of 60 L/min enabled the best performance of the diesel engine. Emissions of CO, CO2, THC, PM, and PAHs fell as the H2/O2 injection rate increased, while the NOx emission increased as the H2/O2 injection rate increased. This was because the addition of H2/O2 improved the combustion efficiency of the fuel. The total oil equivalent saving was about 22.13% compared to neat diesel at an H2/O2 injection rate of 70 L/min.
The BTE decreased from 37.0% to 35.5% while the BSFC increased to 149.75 g/bhp-hr when the PDF was mixed with biodiesel and the injection rate of H2/O2 was set at 60 L/min. These results showed that the performance of the diesel engine declined slightly. The BTE of the 30% biodiesel + PDF decreased roughly 1.5% compared to pure PDF. The emissions of CO, THC, and PAHs decreased as the percentage of biodiesel mixed with PDF increased, but CO2, NOx, and PM increased as the proportion of biodiesel rose.
In the mathematical simulation, H2/O2 was mixed with combustion air at injection rates of 0, 30, 60, and 70 L/min, using C12H26 as the main fuel. The simulation investigated the combustion flame temperature, fuel combustion efficiency, and combustion gas distribution in the diesel engine combustion chamber. The results showed that the combustion temperature and combustion efficiency improved as the H2/O2 injection rate increased.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0807112-135954 |
| Date | 07 August 2012 |
| Creators | Cheng, Chia-Yu |
| Contributors | Wen-Jhy Lee, Kang-Shin Chen, Yuan-Chung (Oliver) Lin, Chung-Bang Chen, Shui-Jen Chen |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0807112-135954 |
| Rights | unrestricted, Copyright information available at source archive |
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