Reducing the emission of solid particles from the exhaust gases of the internal combustion engine by increasing the efficiency of the catalytic converter

The subject of consideration in the article was the assessment of the possibility of reducing the emission of solid particles from the exhaust gases of reciprocating internal combustion engines, which is needed to intensify the activities to reduce their harmful effects on the environment and on the human body. The aim of the work was to assess the possibility of increasing the efficiency of reducing emissions of solid particles with diesel exhaust gases due to the possible stabilization of the temperature of their exhaust gases in front of the catalytic converter. The object of the study was the emissions of solid particles with exhaust gases of diesel engine 4ChN13/15. The experiments were carried out with a KND-Rila type catalytic converter. To reduce the temperature fluctuations of the exhaust gases entering it when the diesel engine is operating in various modes, the authors have created a shell-and-tube type heat exchanger with a heat storage substance - lithium hydroxide. A gravimetric method was used to determine the solids content. The test complex included the MT-120 dilution tunnel developed by the TUV-UVMV institute (Czech Republic), the sampling system on a loading test bench, the Mettler Toledo AX26DR weigher for filter weighing (in a climate chamber on a vibration-insulating foundation, with an accuracy of 2 μg) and filters - “Pall Flex”. The study was conducted when the diesel engine operates on test cycles for variable speed engines according to UNECE Regulation No. 96-02. The method of assessing the effect of stabilization of the exhaust gas temperature on the efficiency of the catalytic converter with respect to the emission of solid particles was to determine the average degree of conversion of solid particles in the neutralizer during the test cycle. The test results showed that the stabilization of the temperature of the exhaust gases in front of the catalytic converter provided a relative improvement in the degree of conversion of solid particles by 56.7%.

diesel, exhaust gases, solid particles, temperature stabilization, catalytic converter, gravimetric method, degree of conversion of solid particles in the neutralizer