STUDY OF THE COMPOSITION OF EXHAUST GAS OF DUAL-FUEL GAS-DIESEL BELAZ 75131 MINING DUMP TRUCKS
The state of the issue on a comparative study of the composition of exhaust gases of KTA 50 engines of diesel and gas-and-diesel fuelled BelAZ 75131 mining dump trucks hauling rock mass is considered. A brief analysis on the demand and operating conditions for this type of mining dump trucks, as well as world experience in converting off-road equipment to liquefied natural gas operation is carried out. It is noted that the use of alternative fuel sources appears to be one of the most promising ways to reduce the impact of heavy duty haulage truck operation on the environment. The research methods are presented. The data on the maximum permissible values of specific weighted average emissions of harmful substances, as well as the values of the correction factors, fuel composition factor values, the results of measurements in stationary conditions of the consumption of antifreeze and air supplied to the cylinder of diesel fuelled KTA 50 internal combustion engine at idle are presented. The obtained data on the comparison of the concentration of CH, CO, O<sub>2</sub> and CO<sub>2</sub> during operation (empty and laden dump trucks going uphill and downhill) of diesel and gas-and-diesel fuelled BelAZ 75131 dump trucks are described and substantiated. The results of calculating the weighted average emissions of harmful substances with exhaust gases of KTA 50 diesel engines of BelAZ 75131mining dump trucks; the results of calculating the excess air coefficients α are presented. The details of the conditions of the measurements are given and brief conclusions are drawn.