8th International Conference on Renewable Fuels, Combustion and Fire (FCE’21), Ankara, Turkey, 5 - 07 March 2021, vol.1, pp.114-119
In this study, biogas was simulated 70% of CH4 and 30% of CO2 (v/v) as biofuel according to the previous
study that biogas was produced from defatted spent coffee ground. Neat diesel (D), neat diesel + biogas
(BG), neat diesel + multilayer carbon nanotube (MCNT), and neat diesel + biogas + multilayer carbon
nanotube were performed under dual fuel operational mode in CI. All fuels were performed at the constant
speed of engine (1500 rpm) under 0, 10.2, 20.41, 30.61, 40.81 N.m load conditions. For the biogas test,
the flow meter was attached before the intake manifold to measure biogas flow rate. The simulated biogas
was injected into the intake manifold in the amount of 500 g/h. Modified diesel was prepared by using high
speed ultrasonic shaker with adding 60 mg MCNT into per liter diesel. The results revealed that dual fuel
mode with biogas has slightly improved the cylinder pressure. The highest improvement of the pressure
was obtained from D + BG + MCNT that increased by 3% comparing to D at 40.81 N.m load. According to the
energy share of dual fuel mode, 180 g/h diesel can be replaced by adding BG + MCNT at 40.81 N.m load.
The highest BTE increment was obtained from modified diesel which is around 4.2% compared to D at 20.41
N.m load. Moreover, adding MCNT was improved BTE in dual fuel mode. Lastly, NOx emission was decreased
by adding both BG and BG+MCNT under all load due to existing CO2 in biogas.