Possibility of improving environmental safety of mobile energy sources used in the agricultural sector by selecting coolant temperature

Abstract

The research findings on improving the environmental safety of mobile energy sources by minimizing harmful emissions from exhaust gases of diesel engines used in agricultural production by choosing the temperature of the coolant are discussed. The authors studied these possibilities based on the results of bench tests of diesel engines of dimension 15/18. It was found when the coolant temperature was reduced from 90°C to 70°C, NO_x emissions decreased by 12%. At the same time, CO emissions increased by 20.48%, C_xH_y - by 8.3%, and particulate matter (PM) - by 27.2%. The degree of excess of permissible estimated emissions at the coolant temperature t = 90°C according to Stage 2 standards was 2.06 times for NO_x, 3.24 times for CO, and 1.65 times for PM; Stage 3a for NOx - 3.09 times; for CO - 3.24 times; for PM - 1.65 times; Stage 3b for NOx - 6.18 times, for CO - 3.4 times, for PM - 1.65 times; Stage 4 for NOx - 30.88 times, for CO - 3.24 times, for PM - 16.5 times; Russian standards for NOx - 2.06 times, for CO - 3.24 times, for PM - 3.3 times. It was found that when the temperature of the coolant changed from 90°C to 70°C, there were prospects for meeting the requirements of the Stage and the Russian standards regarding hydrocarbons only.