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Development of Dedicated Lubricant for Hydrogen Fueled Spark Ignition Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on November 21, 2019 by SAE International in United States
Event: NuGen Summit
Hydrogen has low ignition energy ensures easy ignition of the ultra-lean mixture of H2+air also. The flame speed of hydrogen is about five times higher than methane and gasoline which allows hydrogen fuelled IC engines to have relatively reduced cyclic variations than that of with methane and gasoline. High flame speed also helps to make the combustion closer to constant volume which enhances the thermal efficiency of hydrogen fuelled IC engine. High octane number of hydrogen makes it suitable for its application in Spark ignition (SI) engines. Since the hydrogen combustion in spark ignition engine generates water which can interfere with the lubricant performance, different lubricant is to be developed for this purpose. In this background, the present work is aimed at the development of dedicated lubricant for hydrogen fuelled SI engine. This paper presents the various parameters required for evaluating different lubricants for hydrogen fuelled genset. Existing CNG genset has been converted into hydrogen genset with modification in intake manifold assembly, engine hardware system, ECU modification with adequate modification in exhaust system. State of the art electrical load bank panel system having PLC based automation with data logging provision for accurate measurement of testing parameters is used. It is suitable to apply desirable load in a balanced manner for adequate genset loading with minimised fluctuations. Three different lubricants were evaluated based on emissions such as CO, HC, NOx, Particulates, fuel consumption, BSFC etc. at different loads. Loads were increased in the interval of 1kW/step upto 10 kW. Lubricants were selected based on different chemistry, composition and ash content required for hydrogen fuelled SI engine. Both component based and package based lubricants were evaluated. CO, HC, particulate emissions of varying diameter are observed even in carbon-less fuel vehicle due to the contamination of lube oil in engine. This effect of lube oil was studied in detail to determine the intensity of emissions produced in the engine since hydrogen has a very less particulate emission. The life of lubricant was established as it is prone to blow-by having high moisture content. The best performing lubricant was recommended for long duration endurance test in order to get the durability effect and establishing the lubricant drain interval. Keywords: Hydrogen economy, Hydrogen fuelled genset, Electrical load bank panel system, Lubricant, Emissions, Fuel consumption