Investigation of the speed regime of tractor diesel engine running on natural gas with recirculation

Abstract

The work is devoted to the use of compressed natural gas as an alternative motor fuel to reduce the toxicity of exhaust gases of tractor diesel engines. At the same time, the urgency of using natural gas in combination with exhaust gas recirculation (EGR) (EGR was used to reliably reduce nitrogen oxides increased as a result of the use of natural gas) in diesel was substantiated. The paper presents the results of experimental studies on the effect of natural gas and EGR on the effective characteristics, combustion process indicators, the toxicity and smokiness of exhaust gases depending on the change in the speed of the crankshaft of the tractor diesel. On the basis of the results of the study, it is proposed to maintain the following ratio: natural gas – 80%, the fuse portion of diesel fuel – 20%. When working on natural gas with EGR, the regularity of supply of recirculated gases from 20 to 40% depending on the mode of operation of the tractor diesel is established. The paper defines and presents the optimal values of the effective parameters, characteristics of the combustion process, toxicity and smoke exhaust gases when working tractor diesel 4F 11.0/12.5 on natural gas with EGR. The translation of the specified diesel fuel oil to natural gas helped to reduce the contents in the exhaust gases when working with EGR 20% of the exhaust gas of nitrogen oxides by 43.2%, of carbon black in a 5.6 times that of carbon dioxide 33.3%, carbon monoxide by 10.0%.