Introduction. The relevance of the study is determined by the need to estimate the influence of mixed fuel, including diesel and biofuel (rapeseed oil), on ecological parameters of an agricultural tractor diesel in working in agricultural fields and transporting. The objective of the study is forecasting, obtaining and comparing the calculated and experimental environmental performance indicators of the Belarus-922 tractor diesel engine using mixed fuel for farming operations.
Materials and Methods. To achieve the objective of the study, the quantitative indicators of component structure of rapeseed oil samples of various origins have been defined, a theoretical estimation and the comparison of calculated and experimental environmental performance indicators of tractor diesel engine have been made with the use of the necessary equipment.
Results. For the first time, quantitative values of indexes of the component composition of rapeseed oils of various origins have been obtained. The analysis has shown that the most recommended to be used as fuel is the sample with the maximum content of unsaturated acids that will allow providing the maximum speed and combustion efficiency. The calculations show a decrease in working temperature by 200 K as a result of added rapeseed oils that should lead to a reduction of the constant of the reaction speed and concentration of nitrogen oxides approximately by a factor of 2.7. The endogenous origin of nitrogen compounds influences essentially on the concentration of nitrogen oxides in worked-out gases.
Discussion and Conclusions. Based on the analysis of nitrogen oxide mechanisms on combustion of rapeseed oils, the calculation of the semi-quantitative reaction rate is theoretically proved and experimentally confirmed.
Basic characteristic of fuel control of a tractor diesel engine equipped with a fuel skipping system