Effect of fuel injection timing of hydrogen rich syngas augmented with methane in direct-injection spark-ignition engine. (14th September 2017)

• Record Type: Journal Article
• Authors: Hagos, Ftwi Yohaness; Aziz, A. Rashid A.; Sulaiman, Shaharin A.; Firmansyah, ; Mamat, Rizalman
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 37(2017)
• Page Start: 23846
• Page End: 23855
• Publication Date: 2017-09-14
• Subjects: Methane augmentation -- Injection timing -- Syngas -- Combustion -- Performance -- Emissions; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.03.091
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The product of gasification of solid biomass, also called syngas is believed to be good fuel for internal combustion engines in the move from the carbon based fuel to zero emission fuels. The only problem is its lower calorific value which is placed at one third of that of compressed natural gas (CNG). There are latest efforts to enhance the hydrogen rich syngas by augmenting it with methane so that the calorific value can be improved. This paper presents experimental results of the effect of the start of fuel injection timing (SOI) on the combustion characteristics, performance and emissions of a direct-injection spark-ignition engine fueled with a 20% methane augmented hydrogen rich syngas of molar ratio of 50% H2 and 50% CO composition. The engine was operated at fully open throttle and the start of fuel injection (SOI) was varied at 90, 120 and 180° before top dead center (BTDC). The experiment was conducted at lean mixture conditions in the low and medium engine speed ranges (1500–2400 RPM). The spark advance was set to the minimum advance for a maximum brake torque in all the test parameters. The methane augmented hydrogen rich syngas was observed to perform well over wide range of operation with SOI = 180°CA BTDC. However, SOI = 120°CA BTDC performed well at lower speeds recording improved performance and emissions. Limitation of operable load was observed for both SOI = 120°CA BTDC and 90°CA BTDC due to an insufficient time for complete injection of fuel at lower relative air–fuel ratio ( λ ) with higher speeds. Highlights: 20% methane augmented to a hydrogen rich syngas. The effect of fuel start of injection (SOI) or injection timing on the combustion, performance and emissions investigated. The inlet valve closes at 132°CA BTDC for the engine under investigation. SOI = 180°CA BTDC is taken to be representative of SOI before the inlet valve closes. SOI = 90°CA BTDC and 120°CA BTDC are taken to be representative of SOI after the inlet valve closes.