Reduction of NOx and Smoke from Diesel Engines with Emulsified Fuel

The engine performance and emission characteristics of a high speed diesel engine operated on water emulsified fuel were experimentally investigated. The experiments were carried out by using two types of diesel engines: a disesl engine with non-insulated combustion chamber and an experimental engine with insulated combustion chamber (with ceramic wall) . Water emulsified fuels containing water of up to 5 0 vol.% were evaluated by the two types of diesel engines. Higher temperature of working gas and higher surface temperature of combustion chamber walls were obtained by the insulated chamber engine. This paper describes the results and some findings obtained through the experiments burning water emulsified fuels with a conventional diesel engine and an adiabatic diesel engine. The experiment proves that: Combustion at higher operating temperature in an adiabatic engine results in significant changes in combustion and emission characteristics, compared that of a conventional diesel engine. NOx and smoke emission are greatly and simultaneously reduced without increasing specific fuel consumption rate by the use of water emulsified fuel and an insulated combustion chamber.