Combustion Performance Evaluation of Upgraded Bio-oil Derived From Coconut Oil by Catalytic Cracking
The liquid-phase coconut oil was pyrolyzed in a nitrogen atmosphere at 450 ℃,based on which the upgraded bio-oil was further prepared by gas phase catalytic pyrolysis using CaO as catalyst.Diesel oil,refined bio-oil and palm biodiesel were mixed in different proportions to obtain diesel-upgraded bio-oil binary fuel and diesel-upgraded bio-oil-biodiesel terpolymer fuel.The fuel economy and combustion performance of the hybrid fuel were tested on diesel engine.The results show that compared with the pyrolysis oil from coconut oil,the acid value of the upgraded bio-oil is decreased significantly,the low calorific value is increased by 4.46％,and the oxygen content is decreased by 31％.The heat release rate of diesel-upgraded bio-oil-biodiesel ternary fuel is slightly lower than that of diesel in the pre-injection stage,and is increased in the main injection stage,which is consistent with the change of in-cylinder pressure during the two-stage injection.Compared with diesel-upgraded bio-oil binary fuel,the addition of biodiesel leads to an increase in the cetane value of terpolymer fuel,the ignition delay period is shortened,the heat release starting point is ahead of schedule,and the peak phase of instantaneous heat release rate is closer to that of diesel.Therefore,diesel-upgraded bio-oil-biodiesel ternary fuel is more similar to diesel fuel in terms of combustion characteristics,and is more suitable as an ideal alternative fuel.
万方数据
维普
