Preparation Of Camellia Oil-Based Biodiesel And Study On Emission Characteristics Of Engine

Biodiesel is a renewable energy source.Compared with diesel,it can burn more fully,reduce emissions,and be transported and stored safely.It can be directly applied to diesel engines.These advantages highlight the substitutability and feasibility of camellia oil-based biodiesel.The transesterification reaction is completed under the action of alkali catalysis and purified to obtain pure fatty acid methyl ester,and the process optimization and reaction kinetics research are carried out.Camellia oil-based biodiesel with different blending ratios was obtained by mixing ratios,which were used for the subsequent combustion and emission characteristics experimental research,and the simulation model was analyzed and verified.The preparation test of tea oil-based biodiesel was completed under different reaction conditions through the catalysis of NaOH,the manufacturing process was optimized by orthogonal test,and the reaction kinetics were analyzed and studied.The reaction time was the most significant from the orthogonal test.Taking into account all factors and combined cost considerations,the optimal process conditions for preparing biodiesel are 13:1 alcohol-to-oil ratio,1%catalyst mass fraction,reaction temperature of 60℃,and reaction time of 30 min.The apparent activation energy of the reaction is Ea=1.31kJ/mol,the frequency factor is A=1.04.The combustion simulation results of camellia oil-based biodiesel-diesel blend fuel show that with the increasing load,the peak in-cylinder temperature of tea oil-based biodiesel with different blending ratios increases.The variation trend of in-cylinder pressure is basically the same as that of temperature.Different loads have a greater impact on the pressure variation,and different blending ratios of biodiesel have less impact.With the increasing load,the cumulative heat release of tea oil-based biodiesel with different blending ratios gradually decreased.Different load changes and blending ratio changes have little effect on the combustion duration and the center of gravity of the heat release rate.The load change has a greater impact on the cumulative heat release than the mixing ratio change.When the load increases by 25%,the cumulative heat release increases by about 200J.The change trend of the heat release rate is basically the same as the cumulative heat release.Different loads have a greater influence on the change of the heat release rate,and different blend ratios of biodiesel have less influence.The trend of NO emission is to increase first and then remain stable,and the overall trend of Soot is to increase first and then decrease.With the increase of load,the mass fraction of NO and Soot emissions increased.As the load decreases,the NO mass fraction decreases and the distribution area decreases,while the Soot mass fraction increases and the distribution area increases.With the increase of the mixing ratio,the mass fraction of NO and Soot decreased and the distribution area decreased.The power performance and emission test results of the experimental prototype fueled by tea oil-based biodiesel-diesel mixture show that when the test prototype uses B20 and B50 biodiesel,compared with the use of diesel,its maximum power and maximum torque are basically unchanged,the fuel consumption rate is slightly increased,and the exhaust smoke level is significantly decreased.After the test prototype uses B20 and B50 tea oil-based biodiesel-diesel mixed fuel,its CO emissions are basically unchanged,while NOx and HC emissions are slightly decreased.