Investigation on Emissions and Polycyclic Aromatic Hydrocarbons of a Diesel/Biodiesel Blended Engine with Port-Injecting Gasoline

• Main Authors: Yen-PoWang, 王彥博
• Other Authors: Horng-Wen Wu
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/29918878444203275610

碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 101 === Because the exhaust emissions from an internal combustion engine are a major source of air pollution, domestic and foreign scholars recently has been studying on the emission decrease technologies and alternative fuels in the engine. Biodiesel can be made with the dual benefits of recycling waste and renewable energy. However, the increase of biodiesel ratio will reduce atomization and poor low temperature start, so the introduction of the HCCI (homogeneous charge compression ignition) conducive to igniting the fuel mixture can reduce the smoke and NOX concentrations, but increase the CO and HC concentrations. This study installs a gasoline injection system and control system at the intake of direct injection diesel engine, and gasoline is injected to mix with air forming a homogeneous mixture with directly injecting biodiesel and diesel mixture in the cylinder. The cylinder gas pressure crank angle data, intake air temperature, exhaust gas temperature, air flow rate, exhaust flow rate, and exhaust pollution concentrations (CO/HC/CO2, NOX, Smoke, and PAHs) are measured for diesel engine operating under fixed load, the intake air temperature, exhaust gas recirculation (EGR) ratio, and different speeds when the biodiesel mixture ratio and the energy distribution of the gasoline are changed. The BTE, heat release rate, and the concentrations of exhaust pollution are then analyzed. In addition, this study applies KIVA3V-RELEASE2 adding detailed chemical reaction for numerical computation, and analysis effect of homogeneous charge compression ignition diesel engine by using auxiliary fuel. Comparing experimental results with numerical results can confirm the reliability of the experiment. Use of gasoline as auxiliary fuel can effectively reduce CO2, NOX, and Smoke emissions. For the PAHs emissions, it can reduce Total-PAHs, LMW-PAHs, HMW-PAHs, toxicity equivalence quantity (BaPeq) and three kinds of carcinogenic potential (BbF + BaP + DBA). Petroleum diesel blend of biodiesel can reduce CO, HC, and Smoke emissions; in PAHs emissions, it has reduced effect for total PAHs, LMW-PAHs, HMW-PAHs, BaPeq and (BbF + BaP + DBA). Using B15 with 30 % gasoline auxiliary fuel can reduce 31.17 % for Smoke, 16.67 % for HC, 1.75 % for NOX, but increase 25 % for CO and 2.82 % for CO2 compared with the D100 (petroleum diesel). In the PAHs emissions, it can significantly reduce 58.02 % for total-PAHs, 62.67 % for LMW-PAHs, 40.83 % for HMW-PAHs, 49.24 % for BaPeq and 69.56 % for (BbF + BaP + DBA) but increase 2.66 % for MMW-PAHs. Overall, the use of gasoline can reduce engine pollution emissions.