Effect of dump truck duty type on composition of atmosphere in the work zone

Diesel machines are operated in open pit mines in widely ranged seasonal and geographic conditions. Gas contamination and smokiness of air in the work zone air often necessitate workstoppage in an open pit to wait for the content of harmful elements in air to drop down to a standard. The content and amount of exhaust gas emissions are influenced by geotechnical conditions and by the duty type of engines. The effect of the engine duty type and ambient conditions on smokiness of exhaust gases was analyzed in block tests on turbo-charged diesel engine model 6DM-185 manufactured by Ural Diesel Motor Plant. The cylinder output of the engine is 144 kW, which is similar to the cylinder output of engine model 12DM-185A (155 kW) of BelAZ-75319 dump truck having capacity of 240 tons. Mostly, dump trucks in open pit are operated in the modes of low or medium loading. The charging pressure decreases in this case, and, consequently, the air supply of cylinders drops. With increasing engine load, the engine smokiness is decreased proportionally. Higher ambient temperature adversely affects inflation of cylinders and causes higher smokiness of the engine. At the ambient temperature of 45 °С (hot summer), exhaust gas smokiness exceeds the threshold set by Russian State Standard GOST 24028-2013 1.5–3 times. With a view to combating exhaust carbon, alongside with operation control inside cylinders, attention should be paid to heat insulation of exhaust manifold to reduce the ambient temperature influence on the exhaust gas temperature in front of the turbine, as well as on applicability of alternative fuel. The temperature of exhaust gasses in front of the turbine essentially affects operation of the turbine and the charging pressure value.

Furzikov V. V., Khazin M. L. Effect of dump truck duty type on composition of atmosphere in the work zone. MIAB. Mining Inf. Anal. Bull. 2021;(11-1):111—120. [In Russ]. DOI: 10.25018/0236_1493_2021_111_0_111.

Furzikov V. V., head of research test bureau, Ural Diesel-Motor Works’ LLC, Ekaterinburg, Russia, e-mail: furzikovvv@mail.ru;
Khazin M. L., Dr. Sci. (Eng.), Professor, e-mail: Khasin@ursmu.ru, Ural State Mining University, 620144, Ekaterinburg, Russia.

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