Development of methods of adaptation of gas-diesel engines of agricultural tractors to operation using LPG
Zakhid A. Godzhaev , Sergey Yu. Uyutov , Evgeniy V. Ovchinnikov
Izvestiya MGTU MAMI ›› 2024, Vol. 18 ›› Issue (2) : 83 -92.
Development of methods of adaptation of gas-diesel engines of agricultural tractors to operation using LPG
BACKGROUND: The methods of ensuring detonation-free combustion of liquefied petroleum gases (propane-butane mixtures) (LPG) in a cylinder of the gas-diesel engine with an ignition dose of no more than 25%, at maximal power modes are covered in this paper. Addition of a part of the exhaust gases and vaporous water to the fuel mixture, when using a nickel-based catalyst in the combustion chamber of the gas-diesel engine, which triggers the conversion reaction of lower alkanes, ensures reliable detonation-free combustion of the fuel charge.
AIM: Conducting the analysis of studies on the oxidative conversion of lower alkanes in the presence of nickel catalysts with the development of technical solutions to eliminate detonation in all operating modes. Conducting the research to improve system reliability, to optimize the supply of diesel and gaseous fuel for fuel efficiency improvement and reduction of harmful emissions from exhaust gases when turning the diesel engine into the gas-diesel engine.
METHODS: A nickel catalyst, which is an oxygen carrier, ensures cyclical reactions near its surface in the combustion chamber of the gas-diesel engine, which are metal oxidation when purging the combustion chamber and conversion of alkanes during the compression and combustion strokes. The problem of catalyst carburization is solved by burning off deposits during combustion of the fuel charge.
RESULTS: The preparation of a fuel steam-gas-air mixture with subsequent combustion in the presence of a catalyst ensures improved environmental, fuel consumption characteristics of the gas-diesel engine over the entire range of operating conditions and increases its reliability without detonation combustion of liquefied petroleum gases.
CONCLUSION: The use of the proposed system in diesel engines used in tractors aimed to agricultural technological operations helps to reduce fuel costs by more than 38%.
liquefied petroleum gas / propane-butane mixture / conversion of lower alkanes / gas engine fuel / supply system
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