Combined effect of fuel injecting timing and nozzle opening pressure of a biogas-biodiesel fuelled diesel engine

Abstract

Currently reduce, reuse and recycle are the three attractive options for minimizing the disposal of solid waste generated in the world; and reducing the environmental pollution. Spent tea waste (STW) and waste cooking oil (WCO) are the two different organic wastes which are disposed into open land after their usage. A continuous accumulation of these wastes may increase anthropogenic activity and result in an increase in methane concentration into the atmosphere. Previous research works report that, biogas can be obtained from STW by anaerobic digestion and biodiesel can be produced from WCO by the transesterification processes. In this research work, an attempt was made to explore the possibility of using biodiesel from WCO and biogas obtained from STW as fuels to operate a compression ignition (CI) engine on a dual fuel mode (DFM). The feed stocks WCO and STW were collected from restaurants, and hostels situated in an educational institute. For experimentation, a 4.4 kW, single cylinder, naturally aspirated, DI diesel engine run at a constant speed of 1500 rpm was converted into a DFM to operate on biodiesel-biogas. Experiments were conducted in the DFM test engine to assess the performance, emission and combustion parameters when the dual fuel engine was operated to run on three different mass flow rates of biogas, three different injection timings, and three different nozzle opening pressures. The results obtained from the experimentation were analysed, compared with the diesel operation and presented in this paper.