A before treatment method for reduction of emissions in diesel engines

摘要

Through an addition of a small amount of hydrogen to the main fuel, combustion process can be considerably enhanced in internal combustion engines producing significantly lower levels of exhaust emissions. This improvement in combustion can be mainly attributed to the faster and cleaner burning characteristics of hydrogen in comparison to conventional liquid and gaseous fuels. An oxygen-enrichment of a fuel-air mixture also improves thermal efficiency and reduces especially particulate, carbon monoxide and unburned hydrocarbon emissions in exhaust. This contribution describes the results of experimental investigation where a small amount of hydrogen and oxygen is produced by Hydrogen Generating System through the electrical dissociation of water and are added to the intake of a compression ignition engine operating on a commercial diesel fuel. It is shown that level of exhaust emissions including NO{sub}X can be moderately reduced using such a pre-treatment method in diesel engines. Due to its simplicity, low cost, combustion improvement and moderated reduction in exhaust emissions, such a pre- treatment method might be more attractive in comparison to other new after treatment technologies for application in diesel engines.