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Study of Lean Burn Gas Engines using Pilot Fuel for Ignition Source
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Abstract
Lean burn gas engines are expected to reduce NOx emission while improving engine performances such as output and thermal efficiency. Recently, an ignition method using a small quantity of diesel fuel (pilot fuel) as an ignition source for lean-burn gas engines has introduced further improvement of their performance. Generally, this method has been used for pre-chamber engines because it could not successfully lead to reduce NOx and Particulate emissions when adopted for open-chamber engines. However, the possibility of improvement of performances of open-chamber engines with this ignition method has also been expected(1). An experimental study was conducted to investigate the performance of an open-chamber gas engine with pilot fuel for ignition source. Experiments were conducted by using a single cylinder gas engine equipped with a common-rail injection system. Main gas fuel is supplied to the engine cylinder, and then a small quantity of diesel fuel (approximately 0.4∼1 % of total fuel energy input) was injected into the main chamber for ignition. This open-chamber gas engine has demonstrated superior performance, such as, a shaft-end thermal efficiency of 39.1 % with NOx level of 1.20 g/kW-h and 36.7 % with 0.40 g/kW-h, while maintaining COVimep within 2 %, which equals those of conventional spark ignited pre-chamber lean burn gas engines.
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Citation
Nakagawa, K., Sakurai, T., and Shoji, F., "Study of Lean Burn Gas Engines using Pilot Fuel for Ignition Source," SAE Technical Paper 982480, 1998, https://doi.org/10.4271/982480.Also In
References
- Hupperich P. et.al. Time-Controlled Pilot Injection for Stationary and Heavy-Duty Gas Engines SAE Paper 971713
- Sato T. et.al. Combustion and Exhaust Emissions Characteristics of a Diesel Engine Fueled with Natural Gas JSAE Paper 9538096
- Daisho Y. et.al. Combustion and Exhaust Emissions in a Direct-Injection Diesel Engine Dual-Fueled with Natural Gas SAE Paper 950465
- Sakurai T. et.al. Basic Research on Combustion Chambers for Lean Burn Gas Engines SAE Paper 932710